2103 lines
110 KiB
C
2103 lines
110 KiB
C
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/********************************************************************
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* *
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* THIS FILE IS PART OF THE libopusfile SOFTWARE CODEC SOURCE CODE. *
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* USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS *
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* GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
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* IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING. *
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* *
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* THE libopusfile SOURCE CODE IS (C) COPYRIGHT 1994-2012 *
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* by the Xiph.Org Foundation and contributors http://www.xiph.org/ *
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* *
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********************************************************************
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function: stdio-based convenience library for opening/seeking/decoding
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last mod: $Id: vorbisfile.h 17182 2010-04-29 03:48:32Z xiphmont $
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********************************************************************/
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#if !defined(_opusfile_h)
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# define _opusfile_h (1)
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/**\mainpage
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\section Introduction
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This is the documentation for the <tt>libopusfile</tt> C API.
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The <tt>libopusfile</tt> package provides a convenient high-level API for
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decoding and basic manipulation of all Ogg Opus audio streams.
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<tt>libopusfile</tt> is implemented as a layer on top of Xiph.Org's
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reference
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<tt><a href="https://www.xiph.org/ogg/doc/libogg/reference.html">libogg</a></tt>
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and
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<tt><a href="https://mf4.xiph.org/jenkins/view/opus/job/opus/ws/doc/html/index.html">libopus</a></tt>
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libraries.
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<tt>libopusfile</tt> provides several sets of built-in routines for
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file/stream access, and may also use custom stream I/O routines provided by
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the embedded environment.
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There are built-in I/O routines provided for ANSI-compliant
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<code>stdio</code> (<code>FILE *</code>), memory buffers, and URLs
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(including <file:> URLs, plus optionally <http:> and <https:> URLs).
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\section Organization
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The main API is divided into several sections:
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- \ref stream_open_close
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- \ref stream_info
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- \ref stream_decoding
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- \ref stream_seeking
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Several additional sections are not tied to the main API.
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- \ref stream_callbacks
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- \ref header_info
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- \ref error_codes
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\section Overview
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The <tt>libopusfile</tt> API always decodes files to 48 kHz.
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The original sample rate is not preserved by the lossy compression, though
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it is stored in the header to allow you to resample to it after decoding
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(the <tt>libopusfile</tt> API does not currently provide a resampler,
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but the
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<a href="http://www.speex.org/docs/manual/speex-manual/node7.html#SECTION00760000000000000000">the
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Speex resampler</a> is a good choice if you need one).
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In general, if you are playing back the audio, you should leave it at
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48 kHz, provided your audio hardware supports it.
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When decoding to a file, it may be worth resampling back to the original
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sample rate, so as not to surprise users who might not expect the sample
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rate to change after encoding to Opus and decoding.
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Opus files can contain anywhere from 1 to 255 channels of audio.
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The channel mappings for up to 8 channels are the same as the
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<a href="http://www.xiph.org/vorbis/doc/Vorbis_I_spec.html#x1-800004.3.9">Vorbis
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mappings</a>.
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A special stereo API can convert everything to 2 channels, making it simple
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to support multichannel files in an application which only has stereo
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output.
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Although the <tt>libopusfile</tt> ABI provides support for the theoretical
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maximum number of channels, the current implementation does not support
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files with more than 8 channels, as they do not have well-defined channel
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mappings.
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Like all Ogg files, Opus files may be "chained".
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That is, multiple Opus files may be combined into a single, longer file just
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by concatenating the original files.
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This is commonly done in internet radio streaming, as it allows the title
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and artist to be updated each time the song changes, since each link in the
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chain includes its own set of metadata.
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<tt>libopusfile</tt> fully supports chained files.
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It will decode the first Opus stream found in each link of a chained file
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(ignoring any other streams that might be concurrently multiplexed with it,
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such as a video stream).
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The channel count can also change between links.
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If your application is not prepared to deal with this, it can use the stereo
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API to ensure the audio from all links will always get decoded into a
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common format.
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Since <tt>libopusfile</tt> always decodes to 48 kHz, you do not have to
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worry about the sample rate changing between links (as was possible with
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Vorbis).
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This makes application support for chained files with <tt>libopusfile</tt>
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very easy.*/
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# if defined(__cplusplus)
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extern "C" {
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# endif
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# include <stdarg.h>
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# include <stdio.h>
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# include <ogg/ogg.h>
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# include <opus/opus_multistream.h>
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/**@cond PRIVATE*/
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/*Enable special features for gcc and gcc-compatible compilers.*/
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# if !defined(OP_GNUC_PREREQ)
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# if defined(__GNUC__)&&defined(__GNUC_MINOR__)
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# define OP_GNUC_PREREQ(_maj,_min) \
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((__GNUC__<<16)+__GNUC_MINOR__>=((_maj)<<16)+(_min))
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# else
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# define OP_GNUC_PREREQ(_maj,_min) 0
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# endif
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# endif
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# if OP_GNUC_PREREQ(4,0)
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# pragma GCC visibility push(default)
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# endif
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typedef struct OpusHead OpusHead;
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typedef struct OpusTags OpusTags;
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typedef struct OpusPictureTag OpusPictureTag;
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typedef struct OpusServerInfo OpusServerInfo;
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typedef struct OpusFileCallbacks OpusFileCallbacks;
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typedef struct OggOpusFile OggOpusFile;
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/*Warning attributes for libopusfile functions.*/
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# if OP_GNUC_PREREQ(3,4)
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# define OP_WARN_UNUSED_RESULT __attribute__((__warn_unused_result__))
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# else
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# define OP_WARN_UNUSED_RESULT
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# endif
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# if OP_GNUC_PREREQ(3,4)
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# define OP_ARG_NONNULL(_x) __attribute__((__nonnull__(_x)))
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# else
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# define OP_ARG_NONNULL(_x)
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# endif
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/**@endcond*/
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/**\defgroup error_codes Error Codes*/
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/*@{*/
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/**\name List of possible error codes
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Many of the functions in this library return a negative error code when a
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function fails.
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This list provides a brief explanation of the common errors.
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See each individual function for more details on what a specific error code
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means in that context.*/
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/*@{*/
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/**A request did not succeed.*/
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#define OP_FALSE (-1)
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/*Currently not used externally.*/
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#define OP_EOF (-2)
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/**There was a hole in the page sequence numbers (e.g., a page was corrupt or
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missing).*/
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#define OP_HOLE (-3)
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/**An underlying read, seek, or tell operation failed when it should have
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succeeded.*/
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#define OP_EREAD (-128)
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/**A <code>NULL</code> pointer was passed where one was unexpected, or an
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internal memory allocation failed, or an internal library error was
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encountered.*/
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#define OP_EFAULT (-129)
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/**The stream used a feature that is not implemented, such as an unsupported
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channel family.*/
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#define OP_EIMPL (-130)
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/**One or more parameters to a function were invalid.*/
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#define OP_EINVAL (-131)
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/**A purported Ogg Opus stream did not begin with an Ogg page, a purported
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header packet did not start with one of the required strings, "OpusHead" or
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"OpusTags", or a link in a chained file was encountered that did not
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contain any logical Opus streams.*/
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#define OP_ENOTFORMAT (-132)
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/**A required header packet was not properly formatted, contained illegal
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values, or was missing altogether.*/
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#define OP_EBADHEADER (-133)
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/**The ID header contained an unrecognized version number.*/
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#define OP_EVERSION (-134)
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/*Currently not used at all.*/
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#define OP_ENOTAUDIO (-135)
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/**An audio packet failed to decode properly.
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This is usually caused by a multistream Ogg packet where the durations of
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the individual Opus packets contained in it are not all the same.*/
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#define OP_EBADPACKET (-136)
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/**We failed to find data we had seen before, or the bitstream structure was
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sufficiently malformed that seeking to the target destination was
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impossible.*/
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#define OP_EBADLINK (-137)
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/**An operation that requires seeking was requested on an unseekable stream.*/
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#define OP_ENOSEEK (-138)
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/**The first or last granule position of a link failed basic validity checks.*/
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#define OP_EBADTIMESTAMP (-139)
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/*@}*/
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/*@}*/
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/**\defgroup header_info Header Information*/
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/*@{*/
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/**The maximum number of channels in an Ogg Opus stream.*/
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#define OPUS_CHANNEL_COUNT_MAX (255)
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/**Ogg Opus bitstream information.
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This contains the basic playback parameters for a stream, and corresponds to
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the initial ID header packet of an Ogg Opus stream.*/
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struct OpusHead{
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/**The Ogg Opus format version, in the range 0...255.
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The top 4 bits represent a "major" version, and the bottom four bits
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represent backwards-compatible "minor" revisions.
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The current specification describes version 1.
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This library will recognize versions up through 15 as backwards compatible
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with the current specification.
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An earlier draft of the specification described a version 0, but the only
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difference between version 1 and version 0 is that version 0 did
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not specify the semantics for handling the version field.*/
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int version;
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/**The number of channels, in the range 1...255.*/
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int channel_count;
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/**The number of samples that should be discarded from the beginning of the
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stream.*/
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unsigned pre_skip;
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/**The sampling rate of the original input.
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All Opus audio is coded at 48 kHz, and should also be decoded at 48 kHz
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for playback (unless the target hardware does not support this sampling
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rate).
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However, this field may be used to resample the audio back to the original
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sampling rate, for example, when saving the output to a file.*/
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opus_uint32 input_sample_rate;
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/**The gain to apply to the decoded output, in dB, as a Q8 value in the range
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-32768...32767.
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The <tt>libopusfile</tt> API will automatically apply this gain to the
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decoded output before returning it, scaling it by
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<code>pow(10,output_gain/(20.0*256))</code>.*/
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int output_gain;
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/**The channel mapping family, in the range 0...255.
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Channel mapping family 0 covers mono or stereo in a single stream.
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Channel mapping family 1 covers 1 to 8 channels in one or more streams,
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using the Vorbis speaker assignments.
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Channel mapping family 255 covers 1 to 255 channels in one or more
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streams, but without any defined speaker assignment.*/
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int mapping_family;
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/**The number of Opus streams in each Ogg packet, in the range 1...255.*/
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int stream_count;
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/**The number of coupled Opus streams in each Ogg packet, in the range
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0...127.
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This must satisfy <code>0 <= coupled_count <= stream_count</code> and
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<code>coupled_count + stream_count <= 255</code>.
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The coupled streams appear first, before all uncoupled streams, in an Ogg
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Opus packet.*/
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int coupled_count;
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/**The mapping from coded stream channels to output channels.
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Let <code>index=mapping[k]</code> be the value for channel <code>k</code>.
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If <code>index<2*coupled_count</code>, then it refers to the left channel
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from stream <code>(index/2)</code> if even, and the right channel from
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stream <code>(index/2)</code> if odd.
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Otherwise, it refers to the output of the uncoupled stream
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<code>(index-coupled_count)</code>.*/
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unsigned char mapping[OPUS_CHANNEL_COUNT_MAX];
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};
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/**The metadata from an Ogg Opus stream.
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This structure holds the in-stream metadata corresponding to the 'comment'
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header packet of an Ogg Opus stream.
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The comment header is meant to be used much like someone jotting a quick
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note on the label of a CD.
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It should be a short, to the point text note that can be more than a couple
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words, but not more than a short paragraph.
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The metadata is stored as a series of (tag, value) pairs, in length-encoded
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string vectors, using the same format as Vorbis (without the final "framing
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bit"), Theora, and Speex, except for the packet header.
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The first occurrence of the '=' character delimits the tag and value.
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A particular tag may occur more than once, and order is significant.
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The character set encoding for the strings is always UTF-8, but the tag
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names are limited to ASCII, and treated as case-insensitive.
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See <a href="http://www.xiph.org/vorbis/doc/v-comment.html">the Vorbis
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comment header specification</a> for details.
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In filling in this structure, <tt>libopusfile</tt> will null-terminate the
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#user_comments strings for safety.
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However, the bitstream format itself treats them as 8-bit clean vectors,
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possibly containing NUL characters, so the #comment_lengths array should be
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treated as their authoritative length.
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This structure is binary and source-compatible with a
|
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<code>vorbis_comment</code>, and pointers to it may be freely cast to
|
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<code>vorbis_comment</code> pointers, and vice versa.
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It is provided as a separate type to avoid introducing a compile-time
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dependency on the libvorbis headers.*/
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struct OpusTags{
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/**The array of comment string vectors.*/
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char **user_comments;
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/**An array of the corresponding length of each vector, in bytes.*/
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int *comment_lengths;
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/**The total number of comment streams.*/
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int comments;
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/**The null-terminated vendor string.
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This identifies the software used to encode the stream.*/
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char *vendor;
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};
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/**\name Picture tag image formats*/
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/*@{*/
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||
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/**The MIME type was not recognized, or the image data did not match the
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declared MIME type.*/
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#define OP_PIC_FORMAT_UNKNOWN (-1)
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/**The MIME type indicates the image data is really a URL.*/
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#define OP_PIC_FORMAT_URL (0)
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/**The image is a JPEG.*/
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#define OP_PIC_FORMAT_JPEG (1)
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/**The image is a PNG.*/
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#define OP_PIC_FORMAT_PNG (2)
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/**The image is a GIF.*/
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#define OP_PIC_FORMAT_GIF (3)
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/*@}*/
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/**The contents of a METADATA_BLOCK_PICTURE tag.*/
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struct OpusPictureTag{
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/**The picture type according to the ID3v2 APIC frame:
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<ol start="0">
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<li>Other</li>
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||
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<li>32x32 pixels 'file icon' (PNG only)</li>
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||
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<li>Other file icon</li>
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||
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<li>Cover (front)</li>
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||
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<li>Cover (back)</li>
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||
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<li>Leaflet page</li>
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<li>Media (e.g. label side of CD)</li>
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|
<li>Lead artist/lead performer/soloist</li>
|
||
|
|
<li>Artist/performer</li>
|
||
|
|
<li>Conductor</li>
|
||
|
|
<li>Band/Orchestra</li>
|
||
|
|
<li>Composer</li>
|
||
|
|
<li>Lyricist/text writer</li>
|
||
|
|
<li>Recording Location</li>
|
||
|
|
<li>During recording</li>
|
||
|
|
<li>During performance</li>
|
||
|
|
<li>Movie/video screen capture</li>
|
||
|
|
<li>A bright colored fish</li>
|
||
|
|
<li>Illustration</li>
|
||
|
|
<li>Band/artist logotype</li>
|
||
|
|
<li>Publisher/Studio logotype</li>
|
||
|
|
</ol>
|
||
|
|
Others are reserved and should not be used.
|
||
|
|
There may only be one each of picture type 1 and 2 in a file.*/
|
||
|
|
opus_int32 type;
|
||
|
|
/**The MIME type of the picture, in printable ASCII characters 0x20-0x7E.
|
||
|
|
The MIME type may also be <code>"-->"</code> to signify that the data part
|
||
|
|
is a URL pointing to the picture instead of the picture data itself.
|
||
|
|
In this case, a terminating NUL is appended to the URL string in #data,
|
||
|
|
but #data_length is set to the length of the string excluding that
|
||
|
|
terminating NUL.*/
|
||
|
|
char *mime_type;
|
||
|
|
/**The description of the picture, in UTF-8.*/
|
||
|
|
char *description;
|
||
|
|
/**The width of the picture in pixels.*/
|
||
|
|
opus_uint32 width;
|
||
|
|
/**The height of the picture in pixels.*/
|
||
|
|
opus_uint32 height;
|
||
|
|
/**The color depth of the picture in bits-per-pixel (<em>not</em>
|
||
|
|
bits-per-channel).*/
|
||
|
|
opus_uint32 depth;
|
||
|
|
/**For indexed-color pictures (e.g., GIF), the number of colors used, or 0
|
||
|
|
for non-indexed pictures.*/
|
||
|
|
opus_uint32 colors;
|
||
|
|
/**The length of the picture data in bytes.*/
|
||
|
|
opus_uint32 data_length;
|
||
|
|
/**The binary picture data.*/
|
||
|
|
unsigned char *data;
|
||
|
|
/**The format of the picture data, if known.
|
||
|
|
One of
|
||
|
|
<ul>
|
||
|
|
<li>#OP_PIC_FORMAT_UNKNOWN,</li>
|
||
|
|
<li>#OP_PIC_FORMAT_URL,</li>
|
||
|
|
<li>#OP_PIC_FORMAT_JPEG,</li>
|
||
|
|
<li>#OP_PIC_FORMAT_PNG, or</li>
|
||
|
|
<li>#OP_PIC_FORMAT_GIF.</li>
|
||
|
|
</ul>*/
|
||
|
|
int format;
|
||
|
|
};
|
||
|
|
|
||
|
|
/**\name Functions for manipulating header data
|
||
|
|
|
||
|
|
These functions manipulate the #OpusHead and #OpusTags structures,
|
||
|
|
which describe the audio parameters and tag-value metadata, respectively.
|
||
|
|
These can be used to query the headers returned by <tt>libopusfile</tt>, or
|
||
|
|
to parse Opus headers from sources other than an Ogg Opus stream, provided
|
||
|
|
they use the same format.*/
|
||
|
|
/*@{*/
|
||
|
|
|
||
|
|
/**Parses the contents of the ID header packet of an Ogg Opus stream.
|
||
|
|
\param[out] _head Returns the contents of the parsed packet.
|
||
|
|
The contents of this structure are untouched on error.
|
||
|
|
This may be <code>NULL</code> to merely test the header
|
||
|
|
for validity.
|
||
|
|
\param[in] _data The contents of the ID header packet.
|
||
|
|
\param _len The number of bytes of data in the ID header packet.
|
||
|
|
\return 0 on success or a negative value on error.
|
||
|
|
\retval #OP_ENOTFORMAT If the data does not start with the "OpusHead"
|
||
|
|
string.
|
||
|
|
\retval #OP_EVERSION If the version field signaled a version this library
|
||
|
|
does not know how to parse.
|
||
|
|
\retval #OP_EIMPL If the channel mapping family was 255, which general
|
||
|
|
purpose players should not attempt to play.
|
||
|
|
\retval #OP_EBADHEADER If the contents of the packet otherwise violate the
|
||
|
|
Ogg Opus specification:
|
||
|
|
<ul>
|
||
|
|
<li>Insufficient data,</li>
|
||
|
|
<li>Too much data for the known minor versions,</li>
|
||
|
|
<li>An unrecognized channel mapping family,</li>
|
||
|
|
<li>Zero channels or too many channels,</li>
|
||
|
|
<li>Zero coded streams,</li>
|
||
|
|
<li>Too many coupled streams, or</li>
|
||
|
|
<li>An invalid channel mapping index.</li>
|
||
|
|
</ul>*/
|
||
|
|
OP_WARN_UNUSED_RESULT int opus_head_parse(OpusHead *_head,
|
||
|
|
const unsigned char *_data,size_t _len) OP_ARG_NONNULL(2);
|
||
|
|
|
||
|
|
/**Converts a granule position to a sample offset for a given Ogg Opus stream.
|
||
|
|
The sample offset is simply <code>_gp-_head->pre_skip</code>.
|
||
|
|
Granule position values smaller than OpusHead#pre_skip correspond to audio
|
||
|
|
that should never be played, and thus have no associated sample offset.
|
||
|
|
This function returns -1 for such values.
|
||
|
|
This function also correctly handles extremely large granule positions,
|
||
|
|
which may have wrapped around to a negative number when stored in a signed
|
||
|
|
ogg_int64_t value.
|
||
|
|
\param _head The #OpusHead information from the ID header of the stream.
|
||
|
|
\param _gp The granule position to convert.
|
||
|
|
\return The sample offset associated with the given granule position
|
||
|
|
(counting at a 48 kHz sampling rate), or the special value -1 on
|
||
|
|
error (i.e., the granule position was smaller than the pre-skip
|
||
|
|
amount).*/
|
||
|
|
ogg_int64_t opus_granule_sample(const OpusHead *_head,ogg_int64_t _gp)
|
||
|
|
OP_ARG_NONNULL(1);
|
||
|
|
|
||
|
|
/**Parses the contents of the 'comment' header packet of an Ogg Opus stream.
|
||
|
|
\param[out] _tags An uninitialized #OpusTags structure.
|
||
|
|
This returns the contents of the parsed packet.
|
||
|
|
The contents of this structure are untouched on error.
|
||
|
|
This may be <code>NULL</code> to merely test the header
|
||
|
|
for validity.
|
||
|
|
\param[in] _data The contents of the 'comment' header packet.
|
||
|
|
\param _len The number of bytes of data in the 'info' header packet.
|
||
|
|
\retval 0 Success.
|
||
|
|
\retval #OP_ENOTFORMAT If the data does not start with the "OpusTags"
|
||
|
|
string.
|
||
|
|
\retval #OP_EBADHEADER If the contents of the packet otherwise violate the
|
||
|
|
Ogg Opus specification.
|
||
|
|
\retval #OP_EFAULT If there wasn't enough memory to store the tags.*/
|
||
|
|
OP_WARN_UNUSED_RESULT int opus_tags_parse(OpusTags *_tags,
|
||
|
|
const unsigned char *_data,size_t _len) OP_ARG_NONNULL(2);
|
||
|
|
|
||
|
|
/**Performs a deep copy of an #OpusTags structure.
|
||
|
|
\param _dst The #OpusTags structure to copy into.
|
||
|
|
If this function fails, the contents of this structure remain
|
||
|
|
untouched.
|
||
|
|
\param _src The #OpusTags structure to copy from.
|
||
|
|
\retval 0 Success.
|
||
|
|
\retval #OP_EFAULT If there wasn't enough memory to copy the tags.*/
|
||
|
|
int opus_tags_copy(OpusTags *_dst,const OpusTags *_src) OP_ARG_NONNULL(1);
|
||
|
|
|
||
|
|
/**Initializes an #OpusTags structure.
|
||
|
|
This should be called on a freshly allocated #OpusTags structure before
|
||
|
|
attempting to use it.
|
||
|
|
\param _tags The #OpusTags structure to initialize.*/
|
||
|
|
void opus_tags_init(OpusTags *_tags) OP_ARG_NONNULL(1);
|
||
|
|
|
||
|
|
/**Add a (tag, value) pair to an initialized #OpusTags structure.
|
||
|
|
\note Neither opus_tags_add() nor opus_tags_add_comment() support values
|
||
|
|
containing embedded NULs, although the bitstream format does support them.
|
||
|
|
To add such tags, you will need to manipulate the #OpusTags structure
|
||
|
|
directly.
|
||
|
|
\param _tags The #OpusTags structure to add the (tag, value) pair to.
|
||
|
|
\param _tag A NUL-terminated, case-insensitive, ASCII string containing
|
||
|
|
the tag to add (without an '=' character).
|
||
|
|
\param _value A NUL-terminated UTF-8 containing the corresponding value.
|
||
|
|
\return 0 on success, or a negative value on failure.
|
||
|
|
\retval #OP_EFAULT An internal memory allocation failed.*/
|
||
|
|
int opus_tags_add(OpusTags *_tags,const char *_tag,const char *_value)
|
||
|
|
OP_ARG_NONNULL(1) OP_ARG_NONNULL(2) OP_ARG_NONNULL(3);
|
||
|
|
|
||
|
|
/**Add a comment to an initialized #OpusTags structure.
|
||
|
|
\note Neither opus_tags_add_comment() nor opus_tags_add() support comments
|
||
|
|
containing embedded NULs, although the bitstream format does support them.
|
||
|
|
To add such tags, you will need to manipulate the #OpusTags structure
|
||
|
|
directly.
|
||
|
|
\param _tags The #OpusTags structure to add the comment to.
|
||
|
|
\param _comment A NUL-terminated UTF-8 string containing the comment in
|
||
|
|
"TAG=value" form.
|
||
|
|
\return 0 on success, or a negative value on failure.
|
||
|
|
\retval #OP_EFAULT An internal memory allocation failed.*/
|
||
|
|
int opus_tags_add_comment(OpusTags *_tags,const char *_comment)
|
||
|
|
OP_ARG_NONNULL(1) OP_ARG_NONNULL(2);
|
||
|
|
|
||
|
|
/**Look up a comment value by its tag.
|
||
|
|
\param _tags An initialized #OpusTags structure.
|
||
|
|
\param _tag The tag to look up.
|
||
|
|
\param _count The instance of the tag.
|
||
|
|
The same tag can appear multiple times, each with a distinct
|
||
|
|
value, so an index is required to retrieve them all.
|
||
|
|
The order in which these values appear is significant and
|
||
|
|
should be preserved.
|
||
|
|
Use opus_tags_query_count() to get the legal range for the
|
||
|
|
\a _count parameter.
|
||
|
|
\return A pointer to the queried tag's value.
|
||
|
|
This points directly to data in the #OpusTags structure.
|
||
|
|
It should not be modified or freed by the application, and
|
||
|
|
modifications to the structure may invalidate the pointer.
|
||
|
|
\retval NULL If no matching tag is found.*/
|
||
|
|
const char *opus_tags_query(const OpusTags *_tags,const char *_tag,int _count)
|
||
|
|
OP_ARG_NONNULL(1) OP_ARG_NONNULL(2);
|
||
|
|
|
||
|
|
/**Look up the number of instances of a tag.
|
||
|
|
Call this first when querying for a specific tag and then iterate over the
|
||
|
|
number of instances with separate calls to opus_tags_query() to retrieve
|
||
|
|
all the values for that tag in order.
|
||
|
|
\param _tags An initialized #OpusTags structure.
|
||
|
|
\param _tag The tag to look up.
|
||
|
|
\return The number of instances of this particular tag.*/
|
||
|
|
int opus_tags_query_count(const OpusTags *_tags,const char *_tag)
|
||
|
|
OP_ARG_NONNULL(1) OP_ARG_NONNULL(2);
|
||
|
|
|
||
|
|
/**Get the track gain from an R128_TRACK_GAIN tag, if one was specified.
|
||
|
|
This searches for the first R128_TRACK_GAIN tag with a valid signed,
|
||
|
|
16-bit decimal integer value and returns the value.
|
||
|
|
This routine is exposed merely for convenience for applications which wish
|
||
|
|
to do something special with the track gain (i.e., display it).
|
||
|
|
If you simply wish to apply the track gain instead of the header gain, you
|
||
|
|
can use op_set_gain_offset() with an #OP_TRACK_GAIN type and no offset.
|
||
|
|
\param _tags An initialized #OpusTags structure.
|
||
|
|
\param[out] _gain_q8 The track gain, in 1/256ths of a dB.
|
||
|
|
This will lie in the range [-32768,32767], and should
|
||
|
|
be applied in <em>addition</em> to the header gain.
|
||
|
|
On error, no value is returned, and the previous
|
||
|
|
contents remain unchanged.
|
||
|
|
\return 0 on success, or a negative value on error.
|
||
|
|
\retval #OP_FALSE There was no track gain available in the given tags.*/
|
||
|
|
int opus_tags_get_track_gain(const OpusTags *_tags,int *_gain_q8)
|
||
|
|
OP_ARG_NONNULL(1) OP_ARG_NONNULL(2);
|
||
|
|
|
||
|
|
/**Clears the #OpusTags structure.
|
||
|
|
This should be called on an #OpusTags structure after it is no longer
|
||
|
|
needed.
|
||
|
|
It will free all memory used by the structure members.
|
||
|
|
\param _tags The #OpusTags structure to clear.*/
|
||
|
|
void opus_tags_clear(OpusTags *_tags) OP_ARG_NONNULL(1);
|
||
|
|
|
||
|
|
/**Check if \a _comment is an instance of a \a _tag_name tag.
|
||
|
|
\see opus_tagncompare
|
||
|
|
\param _tag_name A NUL-terminated, case-insensitive, ASCII string containing
|
||
|
|
the name of the tag to check for (without the terminating
|
||
|
|
'=' character).
|
||
|
|
\param _comment The comment string to check.
|
||
|
|
\return An integer less than, equal to, or greater than zero if \a _comment
|
||
|
|
is found respectively, to be less than, to match, or be greater
|
||
|
|
than a "tag=value" string whose tag matches \a _tag_name.*/
|
||
|
|
int opus_tagcompare(const char *_tag_name,const char *_comment);
|
||
|
|
|
||
|
|
/**Check if \a _comment is an instance of a \a _tag_name tag.
|
||
|
|
This version is slightly more efficient than opus_tagcompare() if the length
|
||
|
|
of the tag name is already known (e.g., because it is a constant).
|
||
|
|
\see opus_tagcompare
|
||
|
|
\param _tag_name A case-insensitive ASCII string containing the name of the
|
||
|
|
tag to check for (without the terminating '=' character).
|
||
|
|
\param _tag_len The number of characters in the tag name.
|
||
|
|
This must be non-negative.
|
||
|
|
\param _comment The comment string to check.
|
||
|
|
\return An integer less than, equal to, or greater than zero if \a _comment
|
||
|
|
is found respectively, to be less than, to match, or be greater
|
||
|
|
than a "tag=value" string whose tag matches the first \a _tag_len
|
||
|
|
characters of \a _tag_name.*/
|
||
|
|
int opus_tagncompare(const char *_tag_name,int _tag_len,const char *_comment);
|
||
|
|
|
||
|
|
/**Parse a single METADATA_BLOCK_PICTURE tag.
|
||
|
|
This decodes the BASE64-encoded content of the tag and returns a structure
|
||
|
|
with the MIME type, description, image parameters (if known), and the
|
||
|
|
compressed image data.
|
||
|
|
If the MIME type indicates the presence of an image format we recognize
|
||
|
|
(JPEG, PNG, or GIF) and the actual image data contains the magic signature
|
||
|
|
associated with that format, then the OpusPictureTag::format field will be
|
||
|
|
set to the corresponding format.
|
||
|
|
This is provided as a convenience to avoid requiring applications to parse
|
||
|
|
the MIME type and/or do their own format detection for the commonly used
|
||
|
|
formats.
|
||
|
|
In this case, we also attempt to extract the image parameters directly from
|
||
|
|
the image data (overriding any that were present in the tag, which the
|
||
|
|
specification says applications are not meant to rely on).
|
||
|
|
The application must still provide its own support for actually decoding the
|
||
|
|
image data and, if applicable, retrieving that data from URLs.
|
||
|
|
\param[out] _pic Returns the parsed picture data.
|
||
|
|
No sanitation is done on the type, MIME type, or
|
||
|
|
description fields, so these might return invalid values.
|
||
|
|
The contents of this structure are left unmodified on
|
||
|
|
failure.
|
||
|
|
\param _tag The METADATA_BLOCK_PICTURE tag contents.
|
||
|
|
The leading "METADATA_BLOCK_PICTURE=" portion is optional,
|
||
|
|
to allow the function to be used on either directly on the
|
||
|
|
values in OpusTags::user_comments or on the return value
|
||
|
|
of opus_tags_query().
|
||
|
|
\return 0 on success or a negative value on error.
|
||
|
|
\retval #OP_ENOTFORMAT The METADATA_BLOCK_PICTURE contents were not valid.
|
||
|
|
\retval #OP_EFAULT There was not enough memory to store the picture tag
|
||
|
|
contents.*/
|
||
|
|
OP_WARN_UNUSED_RESULT int opus_picture_tag_parse(OpusPictureTag *_pic,
|
||
|
|
const char *_tag) OP_ARG_NONNULL(1) OP_ARG_NONNULL(2);
|
||
|
|
|
||
|
|
/**Initializes an #OpusPictureTag structure.
|
||
|
|
This should be called on a freshly allocated #OpusPictureTag structure
|
||
|
|
before attempting to use it.
|
||
|
|
\param _pic The #OpusPictureTag structure to initialize.*/
|
||
|
|
void opus_picture_tag_init(OpusPictureTag *_pic) OP_ARG_NONNULL(1);
|
||
|
|
|
||
|
|
/**Clears the #OpusPictureTag structure.
|
||
|
|
This should be called on an #OpusPictureTag structure after it is no longer
|
||
|
|
needed.
|
||
|
|
It will free all memory used by the structure members.
|
||
|
|
\param _pic The #OpusPictureTag structure to clear.*/
|
||
|
|
void opus_picture_tag_clear(OpusPictureTag *_pic) OP_ARG_NONNULL(1);
|
||
|
|
|
||
|
|
/*@}*/
|
||
|
|
|
||
|
|
/*@}*/
|
||
|
|
|
||
|
|
/**\defgroup url_options URL Reading Options*/
|
||
|
|
/*@{*/
|
||
|
|
/**\name URL reading options
|
||
|
|
Options for op_url_stream_create() and associated functions.
|
||
|
|
These allow you to provide proxy configuration parameters, skip SSL
|
||
|
|
certificate checks, etc.
|
||
|
|
Options are processed in order, and if the same option is passed multiple
|
||
|
|
times, only the value specified by the last occurrence has an effect
|
||
|
|
(unless otherwise specified).
|
||
|
|
They may be expanded in the future.*/
|
||
|
|
/*@{*/
|
||
|
|
|
||
|
|
/**@cond PRIVATE*/
|
||
|
|
|
||
|
|
/*These are the raw numbers used to define the request codes.
|
||
|
|
They should not be used directly.*/
|
||
|
|
#define OP_SSL_SKIP_CERTIFICATE_CHECK_REQUEST (6464)
|
||
|
|
#define OP_HTTP_PROXY_HOST_REQUEST (6528)
|
||
|
|
#define OP_HTTP_PROXY_PORT_REQUEST (6592)
|
||
|
|
#define OP_HTTP_PROXY_USER_REQUEST (6656)
|
||
|
|
#define OP_HTTP_PROXY_PASS_REQUEST (6720)
|
||
|
|
#define OP_GET_SERVER_INFO_REQUEST (6784)
|
||
|
|
|
||
|
|
#define OP_URL_OPT(_request) ((_request)+(char *)0)
|
||
|
|
|
||
|
|
/*These macros trigger compilation errors or warnings if the wrong types are
|
||
|
|
provided to one of the URL options.*/
|
||
|
|
#define OP_CHECK_INT(_x) ((void)((_x)==(opus_int32)0),(opus_int32)(_x))
|
||
|
|
#define OP_CHECK_CONST_CHAR_PTR(_x) ((_x)+((_x)-(const char *)(_x)))
|
||
|
|
#define OP_CHECK_SERVER_INFO_PTR(_x) ((_x)+((_x)-(OpusServerInfo *)(_x)))
|
||
|
|
|
||
|
|
/**@endcond*/
|
||
|
|
|
||
|
|
/**HTTP/Shoutcast/Icecast server information associated with a URL.*/
|
||
|
|
struct OpusServerInfo{
|
||
|
|
/**The name of the server (icy-name/ice-name).
|
||
|
|
This is <code>NULL</code> if there was no <code>icy-name</code> or
|
||
|
|
<code>ice-name</code> header.*/
|
||
|
|
char *name;
|
||
|
|
/**A short description of the server (icy-description/ice-description).
|
||
|
|
This is <code>NULL</code> if there was no <code>icy-description</code> or
|
||
|
|
<code>ice-description</code> header.*/
|
||
|
|
char *description;
|
||
|
|
/**The genre the server falls under (icy-genre/ice-genre).
|
||
|
|
This is <code>NULL</code> if there was no <code>icy-genre</code> or
|
||
|
|
<code>ice-genre</code> header.*/
|
||
|
|
char *genre;
|
||
|
|
/**The homepage for the server (icy-url/ice-url).
|
||
|
|
This is <code>NULL</code> if there was no <code>icy-url</code> or
|
||
|
|
<code>ice-url</code> header.*/
|
||
|
|
char *url;
|
||
|
|
/**The software used by the origin server (Server).
|
||
|
|
This is <code>NULL</code> if there was no <code>Server</code> header.*/
|
||
|
|
char *server;
|
||
|
|
/**The media type of the entity sent to the recepient (Content-Type).
|
||
|
|
This is <code>NULL</code> if there was no <code>Content-Type</code>
|
||
|
|
header.*/
|
||
|
|
char *content_type;
|
||
|
|
/**The nominal stream bitrate in kbps (icy-br/ice-bitrate).
|
||
|
|
This is <code>-1</code> if there was no <code>icy-br</code> or
|
||
|
|
<code>ice-bitrate</code> header.*/
|
||
|
|
opus_int32 bitrate_kbps;
|
||
|
|
/**Flag indicating whether the server is public (<code>1</code>) or not
|
||
|
|
(<code>0</code>) (icy-pub/ice-public).
|
||
|
|
This is <code>-1</code> if there was no <code>icy-pub</code> or
|
||
|
|
<code>ice-public</code> header.*/
|
||
|
|
int is_public;
|
||
|
|
/**Flag indicating whether the server is using HTTPS instead of HTTP.
|
||
|
|
This is <code>0</code> unless HTTPS is being used.
|
||
|
|
This may not match the protocol used in the original URL if there were
|
||
|
|
redirections.*/
|
||
|
|
int is_ssl;
|
||
|
|
};
|
||
|
|
|
||
|
|
/**Initializes an #OpusServerInfo structure.
|
||
|
|
All fields are set as if the corresponding header was not available.
|
||
|
|
\param _info The #OpusServerInfo structure to initialize.
|
||
|
|
\note If you use this function, you must link against <tt>libopusurl</tt>.*/
|
||
|
|
void opus_server_info_init(OpusServerInfo *_info) OP_ARG_NONNULL(1);
|
||
|
|
|
||
|
|
/**Clears the #OpusServerInfo structure.
|
||
|
|
This should be called on an #OpusServerInfo structure after it is no longer
|
||
|
|
needed.
|
||
|
|
It will free all memory used by the structure members.
|
||
|
|
\param _info The #OpusServerInfo structure to clear.
|
||
|
|
\note If you use this function, you must link against <tt>libopusurl</tt>.*/
|
||
|
|
void opus_server_info_clear(OpusServerInfo *_info) OP_ARG_NONNULL(1);
|
||
|
|
|
||
|
|
/**Skip the certificate check when connecting via TLS/SSL (https).
|
||
|
|
\param _b <code>opus_int32</code>: Whether or not to skip the certificate
|
||
|
|
check.
|
||
|
|
The check will be skipped if \a _b is non-zero, and will not be
|
||
|
|
skipped if \a _b is zero.
|
||
|
|
\hideinitializer*/
|
||
|
|
#define OP_SSL_SKIP_CERTIFICATE_CHECK(_b) \
|
||
|
|
OP_URL_OPT(OP_SSL_SKIP_CERTIFICATE_CHECK_REQUEST),OP_CHECK_INT(_b)
|
||
|
|
|
||
|
|
/**Proxy connections through the given host.
|
||
|
|
If no port is specified via #OP_HTTP_PROXY_PORT, the port number defaults
|
||
|
|
to 8080 (http-alt).
|
||
|
|
All proxy parameters are ignored for non-http and non-https URLs.
|
||
|
|
\param _host <code>const char *</code>: The proxy server hostname.
|
||
|
|
This may be <code>NULL</code> to disable the use of a proxy
|
||
|
|
server.
|
||
|
|
\hideinitializer*/
|
||
|
|
#define OP_HTTP_PROXY_HOST(_host) \
|
||
|
|
OP_URL_OPT(OP_HTTP_PROXY_HOST_REQUEST),OP_CHECK_CONST_CHAR_PTR(_host)
|
||
|
|
|
||
|
|
/**Use the given port when proxying connections.
|
||
|
|
This option only has an effect if #OP_HTTP_PROXY_HOST is specified with a
|
||
|
|
non-<code>NULL</code> \a _host.
|
||
|
|
If this option is not provided, the proxy port number defaults to 8080
|
||
|
|
(http-alt).
|
||
|
|
All proxy parameters are ignored for non-http and non-https URLs.
|
||
|
|
\param _port <code>opus_int32</code>: The proxy server port.
|
||
|
|
This must be in the range 0...65535 (inclusive), or the
|
||
|
|
URL function this is passed to will fail.
|
||
|
|
\hideinitializer*/
|
||
|
|
#define OP_HTTP_PROXY_PORT(_port) \
|
||
|
|
OP_URL_OPT(OP_HTTP_PROXY_PORT_REQUEST),OP_CHECK_INT(_port)
|
||
|
|
|
||
|
|
/**Use the given user name for authentication when proxying connections.
|
||
|
|
All proxy parameters are ignored for non-http and non-https URLs.
|
||
|
|
\param _user const char *: The proxy server user name.
|
||
|
|
This may be <code>NULL</code> to disable proxy
|
||
|
|
authentication.
|
||
|
|
A non-<code>NULL</code> value only has an effect
|
||
|
|
if #OP_HTTP_PROXY_HOST and #OP_HTTP_PROXY_PASS
|
||
|
|
are also specified with non-<code>NULL</code>
|
||
|
|
arguments.
|
||
|
|
\hideinitializer*/
|
||
|
|
#define OP_HTTP_PROXY_USER(_user) \
|
||
|
|
OP_URL_OPT(OP_HTTP_PROXY_USER_REQUEST),OP_CHECK_CONST_CHAR_PTR(_user)
|
||
|
|
|
||
|
|
/**Use the given password for authentication when proxying connections.
|
||
|
|
All proxy parameters are ignored for non-http and non-https URLs.
|
||
|
|
\param _pass const char *: The proxy server password.
|
||
|
|
This may be <code>NULL</code> to disable proxy
|
||
|
|
authentication.
|
||
|
|
A non-<code>NULL</code> value only has an effect
|
||
|
|
if #OP_HTTP_PROXY_HOST and #OP_HTTP_PROXY_USER
|
||
|
|
are also specified with non-<code>NULL</code>
|
||
|
|
arguments.
|
||
|
|
\hideinitializer*/
|
||
|
|
#define OP_HTTP_PROXY_PASS(_pass) \
|
||
|
|
OP_URL_OPT(OP_HTTP_PROXY_PASS_REQUEST),OP_CHECK_CONST_CHAR_PTR(_pass)
|
||
|
|
|
||
|
|
/**Parse information about the streaming server (if any) and return it.
|
||
|
|
Very little validation is done.
|
||
|
|
In particular, OpusServerInfo::url may not be a valid URL,
|
||
|
|
OpusServerInfo::bitrate_kbps may not really be in kbps, and
|
||
|
|
OpusServerInfo::content_type may not be a valid MIME type.
|
||
|
|
The character set of the string fields is not specified anywhere, and should
|
||
|
|
not be assumed to be valid UTF-8.
|
||
|
|
\param _info OpusServerInfo *: Returns information about the server.
|
||
|
|
If there is any error opening the stream, the
|
||
|
|
contents of this structure remain
|
||
|
|
unmodified.
|
||
|
|
On success, fills in the structure with the
|
||
|
|
server information that was available, if
|
||
|
|
any.
|
||
|
|
After a successful return, the contents of
|
||
|
|
this structure should be freed by calling
|
||
|
|
opus_server_info_clear().
|
||
|
|
\hideinitializer*/
|
||
|
|
#define OP_GET_SERVER_INFO(_info) \
|
||
|
|
OP_URL_OPT(OP_GET_SERVER_INFO_REQUEST),OP_CHECK_SERVER_INFO_PTR(_info)
|
||
|
|
|
||
|
|
/*@}*/
|
||
|
|
/*@}*/
|
||
|
|
|
||
|
|
/**\defgroup stream_callbacks Abstract Stream Reading Interface*/
|
||
|
|
/*@{*/
|
||
|
|
/**\name Functions for reading from streams
|
||
|
|
These functions define the interface used to read from and seek in a stream
|
||
|
|
of data.
|
||
|
|
A stream does not need to implement seeking, but the decoder will not be
|
||
|
|
able to seek if it does not do so.
|
||
|
|
These functions also include some convenience routines for working with
|
||
|
|
standard <code>FILE</code> pointers, complete streams stored in a single
|
||
|
|
block of memory, or URLs.*/
|
||
|
|
/*@{*/
|
||
|
|
|
||
|
|
/**Reads up to \a _nbytes bytes of data from \a _stream.
|
||
|
|
\param _stream The stream to read from.
|
||
|
|
\param[out] _ptr The buffer to store the data in.
|
||
|
|
\param _nbytes The maximum number of bytes to read.
|
||
|
|
This function may return fewer, though it will not
|
||
|
|
return zero unless it reaches end-of-file.
|
||
|
|
\return The number of bytes successfully read, or a negative value on
|
||
|
|
error.*/
|
||
|
|
typedef int (*op_read_func)(void *_stream,unsigned char *_ptr,int _nbytes);
|
||
|
|
|
||
|
|
/**Sets the position indicator for \a _stream.
|
||
|
|
The new position, measured in bytes, is obtained by adding \a _offset
|
||
|
|
bytes to the position specified by \a _whence.
|
||
|
|
If \a _whence is set to <code>SEEK_SET</code>, <code>SEEK_CUR</code>, or
|
||
|
|
<code>SEEK_END</code>, the offset is relative to the start of the stream,
|
||
|
|
the current position indicator, or end-of-file, respectively.
|
||
|
|
\retval 0 Success.
|
||
|
|
\retval -1 Seeking is not supported or an error occurred.
|
||
|
|
<code>errno</code> need not be set.*/
|
||
|
|
typedef int (*op_seek_func)(void *_stream,opus_int64 _offset,int _whence);
|
||
|
|
|
||
|
|
/**Obtains the current value of the position indicator for \a _stream.
|
||
|
|
\return The current position indicator.*/
|
||
|
|
typedef opus_int64 (*op_tell_func)(void *_stream);
|
||
|
|
|
||
|
|
/**Closes the underlying stream.
|
||
|
|
\retval 0 Success.
|
||
|
|
\retval EOF An error occurred.
|
||
|
|
<code>errno</code> need not be set.*/
|
||
|
|
typedef int (*op_close_func)(void *_stream);
|
||
|
|
|
||
|
|
/**The callbacks used to access non-<code>FILE</code> stream resources.
|
||
|
|
The function prototypes are basically the same as for the stdio functions
|
||
|
|
<code>fread()</code>, <code>fseek()</code>, <code>ftell()</code>, and
|
||
|
|
<code>fclose()</code>.
|
||
|
|
The differences are that the <code>FILE *</code> arguments have been
|
||
|
|
replaced with a <code>void *</code>, which is to be used as a pointer to
|
||
|
|
whatever internal data these functions might need, that #seek and #tell
|
||
|
|
take and return 64-bit offsets, and that #seek <em>must</em> return -1 if
|
||
|
|
the stream is unseekable.*/
|
||
|
|
struct OpusFileCallbacks{
|
||
|
|
/**Used to read data from the stream.
|
||
|
|
This must not be <code>NULL</code>.*/
|
||
|
|
op_read_func read;
|
||
|
|
/**Used to seek in the stream.
|
||
|
|
This may be <code>NULL</code> if seeking is not implemented.*/
|
||
|
|
op_seek_func seek;
|
||
|
|
/**Used to return the current read position in the stream.
|
||
|
|
This may be <code>NULL</code> if seeking is not implemented.*/
|
||
|
|
op_tell_func tell;
|
||
|
|
/**Used to close the stream when the decoder is freed.
|
||
|
|
This may be <code>NULL</code> to leave the stream open.*/
|
||
|
|
op_close_func close;
|
||
|
|
};
|
||
|
|
|
||
|
|
/**Opens a stream with <code>fopen()</code> and fills in a set of callbacks
|
||
|
|
that can be used to access it.
|
||
|
|
This is useful to avoid writing your own portable 64-bit seeking wrappers,
|
||
|
|
and also avoids cross-module linking issues on Windows, where a
|
||
|
|
<code>FILE *</code> must be accessed by routines defined in the same module
|
||
|
|
that opened it.
|
||
|
|
\param[out] _cb The callbacks to use for this file.
|
||
|
|
If there is an error opening the file, nothing will be
|
||
|
|
filled in here.
|
||
|
|
\param _path The path to the file to open.
|
||
|
|
On Windows, this string must be UTF-8 (to allow access to
|
||
|
|
files whose names cannot be represented in the current
|
||
|
|
MBCS code page).
|
||
|
|
All other systems use the native character encoding.
|
||
|
|
\param _mode The mode to open the file in.
|
||
|
|
\return A stream handle to use with the callbacks, or <code>NULL</code> on
|
||
|
|
error.*/
|
||
|
|
OP_WARN_UNUSED_RESULT void *op_fopen(OpusFileCallbacks *_cb,
|
||
|
|
const char *_path,const char *_mode) OP_ARG_NONNULL(1) OP_ARG_NONNULL(2)
|
||
|
|
OP_ARG_NONNULL(3);
|
||
|
|
|
||
|
|
/**Opens a stream with <code>fdopen()</code> and fills in a set of callbacks
|
||
|
|
that can be used to access it.
|
||
|
|
This is useful to avoid writing your own portable 64-bit seeking wrappers,
|
||
|
|
and also avoids cross-module linking issues on Windows, where a
|
||
|
|
<code>FILE *</code> must be accessed by routines defined in the same module
|
||
|
|
that opened it.
|
||
|
|
\param[out] _cb The callbacks to use for this file.
|
||
|
|
If there is an error opening the file, nothing will be
|
||
|
|
filled in here.
|
||
|
|
\param _fd The file descriptor to open.
|
||
|
|
\param _mode The mode to open the file in.
|
||
|
|
\return A stream handle to use with the callbacks, or <code>NULL</code> on
|
||
|
|
error.*/
|
||
|
|
OP_WARN_UNUSED_RESULT void *op_fdopen(OpusFileCallbacks *_cb,
|
||
|
|
int _fd,const char *_mode) OP_ARG_NONNULL(1) OP_ARG_NONNULL(3);
|
||
|
|
|
||
|
|
/**Opens a stream with <code>freopen()</code> and fills in a set of callbacks
|
||
|
|
that can be used to access it.
|
||
|
|
This is useful to avoid writing your own portable 64-bit seeking wrappers,
|
||
|
|
and also avoids cross-module linking issues on Windows, where a
|
||
|
|
<code>FILE *</code> must be accessed by routines defined in the same module
|
||
|
|
that opened it.
|
||
|
|
\param[out] _cb The callbacks to use for this file.
|
||
|
|
If there is an error opening the file, nothing will be
|
||
|
|
filled in here.
|
||
|
|
\param _path The path to the file to open.
|
||
|
|
On Windows, this string must be UTF-8 (to allow access
|
||
|
|
to files whose names cannot be represented in the
|
||
|
|
current MBCS code page).
|
||
|
|
All other systems use the native character encoding.
|
||
|
|
\param _mode The mode to open the file in.
|
||
|
|
\param _stream A stream previously returned by op_fopen(), op_fdopen(),
|
||
|
|
or op_freopen().
|
||
|
|
\return A stream handle to use with the callbacks, or <code>NULL</code> on
|
||
|
|
error.*/
|
||
|
|
OP_WARN_UNUSED_RESULT void *op_freopen(OpusFileCallbacks *_cb,
|
||
|
|
const char *_path,const char *_mode,void *_stream) OP_ARG_NONNULL(1)
|
||
|
|
OP_ARG_NONNULL(2) OP_ARG_NONNULL(3) OP_ARG_NONNULL(4);
|
||
|
|
|
||
|
|
/**Creates a stream that reads from the given block of memory.
|
||
|
|
This block of memory must contain the complete stream to decode.
|
||
|
|
This is useful for caching small streams (e.g., sound effects) in RAM.
|
||
|
|
\param[out] _cb The callbacks to use for this stream.
|
||
|
|
If there is an error creating the stream, nothing will be
|
||
|
|
filled in here.
|
||
|
|
\param _data The block of memory to read from.
|
||
|
|
\param _size The size of the block of memory.
|
||
|
|
\return A stream handle to use with the callbacks, or <code>NULL</code> on
|
||
|
|
error.*/
|
||
|
|
OP_WARN_UNUSED_RESULT void *op_mem_stream_create(OpusFileCallbacks *_cb,
|
||
|
|
const unsigned char *_data,size_t _size) OP_ARG_NONNULL(1);
|
||
|
|
|
||
|
|
/**Creates a stream that reads from the given URL.
|
||
|
|
This function behaves identically to op_url_stream_create(), except that it
|
||
|
|
takes a va_list instead of a variable number of arguments.
|
||
|
|
It does not call the <code>va_end</code> macro, and because it invokes the
|
||
|
|
<code>va_arg</code> macro, the value of \a _ap is undefined after the call.
|
||
|
|
\note If you use this function, you must link against <tt>libopusurl</tt>.
|
||
|
|
\param[out] _cb The callbacks to use for this stream.
|
||
|
|
If there is an error creating the stream, nothing will
|
||
|
|
be filled in here.
|
||
|
|
\param _url The URL to read from.
|
||
|
|
Currently only the <file:>, <http:>, and <https:>
|
||
|
|
schemes are supported.
|
||
|
|
Both <http:> and <https:> may be disabled at compile
|
||
|
|
time, in which case opening such URLs will always fail.
|
||
|
|
Currently this only supports URIs.
|
||
|
|
IRIs should be converted to UTF-8 and URL-escaped, with
|
||
|
|
internationalized domain names encoded in punycode,
|
||
|
|
before passing them to this function.
|
||
|
|
\param[in,out] _ap A list of the \ref url_options "optional flags" to use.
|
||
|
|
This is a variable-length list of options terminated
|
||
|
|
with <code>NULL</code>.
|
||
|
|
\return A stream handle to use with the callbacks, or <code>NULL</code> on
|
||
|
|
error.*/
|
||
|
|
OP_WARN_UNUSED_RESULT void *op_url_stream_vcreate(OpusFileCallbacks *_cb,
|
||
|
|
const char *_url,va_list _ap) OP_ARG_NONNULL(1) OP_ARG_NONNULL(2);
|
||
|
|
|
||
|
|
/**Creates a stream that reads from the given URL.
|
||
|
|
\note If you use this function, you must link against <tt>libopusurl</tt>.
|
||
|
|
\param[out] _cb The callbacks to use for this stream.
|
||
|
|
If there is an error creating the stream, nothing will be
|
||
|
|
filled in here.
|
||
|
|
\param _url The URL to read from.
|
||
|
|
Currently only the <file:>, <http:>, and <https:> schemes
|
||
|
|
are supported.
|
||
|
|
Both <http:> and <https:> may be disabled at compile time,
|
||
|
|
in which case opening such URLs will always fail.
|
||
|
|
Currently this only supports URIs.
|
||
|
|
IRIs should be converted to UTF-8 and URL-escaped, with
|
||
|
|
internationalized domain names encoded in punycode, before
|
||
|
|
passing them to this function.
|
||
|
|
\param ... The \ref url_options "optional flags" to use.
|
||
|
|
This is a variable-length list of options terminated with
|
||
|
|
<code>NULL</code>.
|
||
|
|
\return A stream handle to use with the callbacks, or <code>NULL</code> on
|
||
|
|
error.*/
|
||
|
|
OP_WARN_UNUSED_RESULT void *op_url_stream_create(OpusFileCallbacks *_cb,
|
||
|
|
const char *_url,...) OP_ARG_NONNULL(1) OP_ARG_NONNULL(2);
|
||
|
|
|
||
|
|
/*@}*/
|
||
|
|
/*@}*/
|
||
|
|
|
||
|
|
/**\defgroup stream_open_close Opening and Closing*/
|
||
|
|
/*@{*/
|
||
|
|
/**\name Functions for opening and closing streams
|
||
|
|
|
||
|
|
These functions allow you to test a stream to see if it is Opus, open it,
|
||
|
|
and close it.
|
||
|
|
Several flavors are provided for each of the built-in stream types, plus a
|
||
|
|
more general version which takes a set of application-provided callbacks.*/
|
||
|
|
/*@{*/
|
||
|
|
|
||
|
|
/**Test to see if this is an Opus stream.
|
||
|
|
For good results, you will need at least 57 bytes (for a pure Opus-only
|
||
|
|
stream).
|
||
|
|
Something like 512 bytes will give more reliable results for multiplexed
|
||
|
|
streams.
|
||
|
|
This function is meant to be a quick-rejection filter.
|
||
|
|
Its purpose is not to guarantee that a stream is a valid Opus stream, but to
|
||
|
|
ensure that it looks enough like Opus that it isn't going to be recognized
|
||
|
|
as some other format (except possibly an Opus stream that is also
|
||
|
|
multiplexed with other codecs, such as video).
|
||
|
|
\param[out] _head The parsed ID header contents.
|
||
|
|
You may pass <code>NULL</code> if you do not need
|
||
|
|
this information.
|
||
|
|
If the function fails, the contents of this structure
|
||
|
|
remain untouched.
|
||
|
|
\param _initial_data An initial buffer of data from the start of the
|
||
|
|
stream.
|
||
|
|
\param _initial_bytes The number of bytes in \a _initial_data.
|
||
|
|
\return 0 if the data appears to be Opus, or a negative value on error.
|
||
|
|
\retval #OP_FALSE There was not enough data to tell if this was an Opus
|
||
|
|
stream or not.
|
||
|
|
\retval #OP_EFAULT An internal memory allocation failed.
|
||
|
|
\retval #OP_EIMPL The stream used a feature that is not implemented,
|
||
|
|
such as an unsupported channel family.
|
||
|
|
\retval #OP_ENOTFORMAT If the data did not contain a recognizable ID
|
||
|
|
header for an Opus stream.
|
||
|
|
\retval #OP_EVERSION If the version field signaled a version this library
|
||
|
|
does not know how to parse.
|
||
|
|
\retval #OP_EBADHEADER The ID header was not properly formatted or contained
|
||
|
|
illegal values.*/
|
||
|
|
int op_test(OpusHead *_head,
|
||
|
|
const unsigned char *_initial_data,size_t _initial_bytes);
|
||
|
|
|
||
|
|
/**Open a stream from the given file path.
|
||
|
|
\param _path The path to the file to open.
|
||
|
|
\param[out] _error Returns 0 on success, or a failure code on error.
|
||
|
|
You may pass in <code>NULL</code> if you don't want the
|
||
|
|
failure code.
|
||
|
|
The failure code will be #OP_EFAULT if the file could not
|
||
|
|
be opened, or one of the other failure codes from
|
||
|
|
op_open_callbacks() otherwise.
|
||
|
|
\return A freshly opened \c OggOpusFile, or <code>NULL</code> on error.*/
|
||
|
|
OP_WARN_UNUSED_RESULT OggOpusFile *op_open_file(const char *_path,int *_error)
|
||
|
|
OP_ARG_NONNULL(1);
|
||
|
|
|
||
|
|
/**Open a stream from a memory buffer.
|
||
|
|
\param _data The memory buffer to open.
|
||
|
|
\param _size The number of bytes in the buffer.
|
||
|
|
\param[out] _error Returns 0 on success, or a failure code on error.
|
||
|
|
You may pass in <code>NULL</code> if you don't want the
|
||
|
|
failure code.
|
||
|
|
See op_open_callbacks() for a full list of failure codes.
|
||
|
|
\return A freshly opened \c OggOpusFile, or <code>NULL</code> on error.*/
|
||
|
|
OP_WARN_UNUSED_RESULT OggOpusFile *op_open_memory(const unsigned char *_data,
|
||
|
|
size_t _size,int *_error);
|
||
|
|
|
||
|
|
/**Open a stream from a URL.
|
||
|
|
This function behaves identically to op_open_url(), except that it
|
||
|
|
takes a va_list instead of a variable number of arguments.
|
||
|
|
It does not call the <code>va_end</code> macro, and because it invokes the
|
||
|
|
<code>va_arg</code> macro, the value of \a _ap is undefined after the call.
|
||
|
|
\note If you use this function, you must link against <tt>libopusurl</tt>.
|
||
|
|
\param _url The URL to open.
|
||
|
|
Currently only the <file:>, <http:>, and <https:>
|
||
|
|
schemes are supported.
|
||
|
|
Both <http:> and <https:> may be disabled at compile
|
||
|
|
time, in which case opening such URLs will always
|
||
|
|
fail.
|
||
|
|
Currently this only supports URIs.
|
||
|
|
IRIs should be converted to UTF-8 and URL-escaped,
|
||
|
|
with internationalized domain names encoded in
|
||
|
|
punycode, before passing them to this function.
|
||
|
|
\param[out] _error Returns 0 on success, or a failure code on error.
|
||
|
|
You may pass in <code>NULL</code> if you don't want
|
||
|
|
the failure code.
|
||
|
|
See op_open_callbacks() for a full list of failure
|
||
|
|
codes.
|
||
|
|
\param[in,out] _ap A list of the \ref url_options "optional flags" to
|
||
|
|
use.
|
||
|
|
This is a variable-length list of options terminated
|
||
|
|
with <code>NULL</code>.
|
||
|
|
\return A freshly opened \c OggOpusFile, or <code>NULL</code> on error.*/
|
||
|
|
OP_WARN_UNUSED_RESULT OggOpusFile *op_vopen_url(const char *_url,
|
||
|
|
int *_error,va_list _ap) OP_ARG_NONNULL(1);
|
||
|
|
|
||
|
|
/**Open a stream from a URL.
|
||
|
|
\note If you use this function, you must link against <tt>libopusurl</tt>.
|
||
|
|
\param _url The URL to open.
|
||
|
|
Currently only the <file:>, <http:>, and <https:> schemes
|
||
|
|
are supported.
|
||
|
|
Both <http:> and <https:> may be disabled at compile
|
||
|
|
time, in which case opening such URLs will always fail.
|
||
|
|
Currently this only supports URIs.
|
||
|
|
IRIs should be converted to UTF-8 and URL-escaped, with
|
||
|
|
internationalized domain names encoded in punycode,
|
||
|
|
before passing them to this function.
|
||
|
|
\param[out] _error Returns 0 on success, or a failure code on error.
|
||
|
|
You may pass in <code>NULL</code> if you don't want the
|
||
|
|
failure code.
|
||
|
|
See op_open_callbacks() for a full list of failure codes.
|
||
|
|
\param ... The \ref url_options "optional flags" to use.
|
||
|
|
This is a variable-length list of options terminated with
|
||
|
|
<code>NULL</code>.
|
||
|
|
\return A freshly opened \c OggOpusFile, or <code>NULL</code> on error.*/
|
||
|
|
OP_WARN_UNUSED_RESULT OggOpusFile *op_open_url(const char *_url,
|
||
|
|
int *_error,...) OP_ARG_NONNULL(1);
|
||
|
|
|
||
|
|
/**Open a stream using the given set of callbacks to access it.
|
||
|
|
\param _source The stream to read from (e.g., a <code>FILE *</code>).
|
||
|
|
\param _cb The callbacks with which to access the stream.
|
||
|
|
<code><a href="#op_read_func">read()</a></code> must
|
||
|
|
be implemented.
|
||
|
|
<code><a href="#op_seek_func">seek()</a></code> and
|
||
|
|
<code><a href="#op_tell_func">tell()</a></code> may
|
||
|
|
be <code>NULL</code>, or may always return -1 to
|
||
|
|
indicate a source is unseekable, but if
|
||
|
|
<code><a href="#op_seek_func">seek()</a></code> is
|
||
|
|
implemented and succeeds on a particular source, then
|
||
|
|
<code><a href="#op_tell_func">tell()</a></code> must
|
||
|
|
also.
|
||
|
|
<code><a href="#op_close_func">close()</a></code> may
|
||
|
|
be <code>NULL</code>, but if it is not, it will be
|
||
|
|
called when the \c OggOpusFile is destroyed by
|
||
|
|
op_free().
|
||
|
|
It will not be called if op_open_callbacks() fails
|
||
|
|
with an error.
|
||
|
|
\param _initial_data An initial buffer of data from the start of the
|
||
|
|
stream.
|
||
|
|
Applications can read some number of bytes from the
|
||
|
|
start of the stream to help identify this as an Opus
|
||
|
|
stream, and then provide them here to allow the
|
||
|
|
stream to be opened, even if it is unseekable.
|
||
|
|
\param _initial_bytes The number of bytes in \a _initial_data.
|
||
|
|
If the stream is seekable, its current position (as
|
||
|
|
reported by
|
||
|
|
<code><a href="#opus_tell_func">tell()</a></code>
|
||
|
|
at the start of this function) must be equal to
|
||
|
|
\a _initial_bytes.
|
||
|
|
Otherwise, seeking to absolute positions will
|
||
|
|
generate inconsistent results.
|
||
|
|
\param[out] _error Returns 0 on success, or a failure code on error.
|
||
|
|
You may pass in <code>NULL</code> if you don't want
|
||
|
|
the failure code.
|
||
|
|
The failure code will be one of
|
||
|
|
<dl>
|
||
|
|
<dt>#OP_EREAD</dt>
|
||
|
|
<dd>An underlying read, seek, or tell operation
|
||
|
|
failed when it should have succeeded, or we failed
|
||
|
|
to find data in the stream we had seen before.</dd>
|
||
|
|
<dt>#OP_EFAULT</dt>
|
||
|
|
<dd>There was a memory allocation failure, or an
|
||
|
|
internal library error.</dd>
|
||
|
|
<dt>#OP_EIMPL</dt>
|
||
|
|
<dd>The stream used a feature that is not
|
||
|
|
implemented, such as an unsupported channel
|
||
|
|
family.</dd>
|
||
|
|
<dt>#OP_EINVAL</dt>
|
||
|
|
<dd><code><a href="#op_seek_func">seek()</a></code>
|
||
|
|
was implemented and succeeded on this source, but
|
||
|
|
<code><a href="#op_tell_func">tell()</a></code>
|
||
|
|
did not, or the starting position indicator was
|
||
|
|
not equal to \a _initial_bytes.</dd>
|
||
|
|
<dt>#OP_ENOTFORMAT</dt>
|
||
|
|
<dd>The stream contained a link that did not have
|
||
|
|
any logical Opus streams in it.</dd>
|
||
|
|
<dt>#OP_EBADHEADER</dt>
|
||
|
|
<dd>A required header packet was not properly
|
||
|
|
formatted, contained illegal values, or was missing
|
||
|
|
altogether.</dd>
|
||
|
|
<dt>#OP_EVERSION</dt>
|
||
|
|
<dd>An ID header contained an unrecognized version
|
||
|
|
number.</dd>
|
||
|
|
<dt>#OP_EBADLINK</dt>
|
||
|
|
<dd>We failed to find data we had seen before after
|
||
|
|
seeking.</dd>
|
||
|
|
<dt>#OP_EBADTIMESTAMP</dt>
|
||
|
|
<dd>The first or last timestamp in a link failed
|
||
|
|
basic validity checks.</dd>
|
||
|
|
</dl>
|
||
|
|
\return A freshly opened \c OggOpusFile, or <code>NULL</code> on error.
|
||
|
|
<tt>libopusfile</tt> does <em>not</em> take ownership of the source
|
||
|
|
if the call fails.
|
||
|
|
The calling application is responsible for closing the source if
|
||
|
|
this call returns an error.*/
|
||
|
|
OP_WARN_UNUSED_RESULT OggOpusFile *op_open_callbacks(void *_source,
|
||
|
|
const OpusFileCallbacks *_cb,const unsigned char *_initial_data,
|
||
|
|
size_t _initial_bytes,int *_error) OP_ARG_NONNULL(2);
|
||
|
|
|
||
|
|
/**Partially open a stream from the given file path.
|
||
|
|
\see op_test_callbacks
|
||
|
|
\param _path The path to the file to open.
|
||
|
|
\param[out] _error Returns 0 on success, or a failure code on error.
|
||
|
|
You may pass in <code>NULL</code> if you don't want the
|
||
|
|
failure code.
|
||
|
|
The failure code will be #OP_EFAULT if the file could not
|
||
|
|
be opened, or one of the other failure codes from
|
||
|
|
op_open_callbacks() otherwise.
|
||
|
|
\return A partially opened \c OggOpusFile, or <code>NULL</code> on error.*/
|
||
|
|
OP_WARN_UNUSED_RESULT OggOpusFile *op_test_file(const char *_path,int *_error)
|
||
|
|
OP_ARG_NONNULL(1);
|
||
|
|
|
||
|
|
/**Partially open a stream from a memory buffer.
|
||
|
|
\see op_test_callbacks
|
||
|
|
\param _data The memory buffer to open.
|
||
|
|
\param _size The number of bytes in the buffer.
|
||
|
|
\param[out] _error Returns 0 on success, or a failure code on error.
|
||
|
|
You may pass in <code>NULL</code> if you don't want the
|
||
|
|
failure code.
|
||
|
|
See op_open_callbacks() for a full list of failure codes.
|
||
|
|
\return A partially opened \c OggOpusFile, or <code>NULL</code> on error.*/
|
||
|
|
OP_WARN_UNUSED_RESULT OggOpusFile *op_test_memory(const unsigned char *_data,
|
||
|
|
size_t _size,int *_error);
|
||
|
|
|
||
|
|
/**Partially open a stream from a URL.
|
||
|
|
This function behaves identically to op_test_url(), except that it
|
||
|
|
takes a va_list instead of a variable number of arguments.
|
||
|
|
It does not call the <code>va_end</code> macro, and because it invokes the
|
||
|
|
<code>va_arg</code> macro, the value of \a _ap is undefined after the call.
|
||
|
|
\note If you use this function, you must link against <tt>libopusurl</tt>.
|
||
|
|
\see op_test_url
|
||
|
|
\see op_test_callbacks
|
||
|
|
\param _url The URL to open.
|
||
|
|
Currently only the <file:>, <http:>, and <https:>
|
||
|
|
schemes are supported.
|
||
|
|
Both <http:> and <https:> may be disabled at compile
|
||
|
|
time, in which case opening such URLs will always
|
||
|
|
fail.
|
||
|
|
Currently this only supports URIs.
|
||
|
|
IRIs should be converted to UTF-8 and URL-escaped,
|
||
|
|
with internationalized domain names encoded in
|
||
|
|
punycode, before passing them to this function.
|
||
|
|
\param[out] _error Returns 0 on success, or a failure code on error.
|
||
|
|
You may pass in <code>NULL</code> if you don't want
|
||
|
|
the failure code.
|
||
|
|
See op_open_callbacks() for a full list of failure
|
||
|
|
codes.
|
||
|
|
\param[in,out] _ap A list of the \ref url_options "optional flags" to
|
||
|
|
use.
|
||
|
|
This is a variable-length list of options terminated
|
||
|
|
with <code>NULL</code>.
|
||
|
|
\return A partially opened \c OggOpusFile, or <code>NULL</code> on error.*/
|
||
|
|
OP_WARN_UNUSED_RESULT OggOpusFile *op_vtest_url(const char *_url,
|
||
|
|
int *_error,va_list _ap) OP_ARG_NONNULL(1);
|
||
|
|
|
||
|
|
/**Partially open a stream from a URL.
|
||
|
|
\note If you use this function, you must link against <tt>libopusurl</tt>.
|
||
|
|
\see op_test_callbacks
|
||
|
|
\param _url The URL to open.
|
||
|
|
Currently only the <file:>, <http:>, and <https:>
|
||
|
|
schemes are supported.
|
||
|
|
Both <http:> and <https:> may be disabled at compile
|
||
|
|
time, in which case opening such URLs will always fail.
|
||
|
|
Currently this only supports URIs.
|
||
|
|
IRIs should be converted to UTF-8 and URL-escaped, with
|
||
|
|
internationalized domain names encoded in punycode,
|
||
|
|
before passing them to this function.
|
||
|
|
\param[out] _error Returns 0 on success, or a failure code on error.
|
||
|
|
You may pass in <code>NULL</code> if you don't want the
|
||
|
|
failure code.
|
||
|
|
See op_open_callbacks() for a full list of failure
|
||
|
|
codes.
|
||
|
|
\param ... The \ref url_options "optional flags" to use.
|
||
|
|
This is a variable-length list of options terminated
|
||
|
|
with <code>NULL</code>.
|
||
|
|
\return A partially opened \c OggOpusFile, or <code>NULL</code> on error.*/
|
||
|
|
OP_WARN_UNUSED_RESULT OggOpusFile *op_test_url(const char *_url,
|
||
|
|
int *_error,...) OP_ARG_NONNULL(1);
|
||
|
|
|
||
|
|
/**Partially open a stream using the given set of callbacks to access it.
|
||
|
|
This tests for Opusness and loads the headers for the first link.
|
||
|
|
It does not seek (although it tests for seekability).
|
||
|
|
You can query a partially open stream for the few pieces of basic
|
||
|
|
information returned by op_serialno(), op_channel_count(), op_head(), and
|
||
|
|
op_tags() (but only for the first link).
|
||
|
|
You may also determine if it is seekable via a call to op_seekable().
|
||
|
|
You cannot read audio from the stream, seek, get the size or duration,
|
||
|
|
get information from links other than the first one, or even get the total
|
||
|
|
number of links until you finish opening the stream with op_test_open().
|
||
|
|
If you do not need to do any of these things, you can dispose of it with
|
||
|
|
op_free() instead.
|
||
|
|
|
||
|
|
This function is provided mostly to simplify porting existing code that used
|
||
|
|
<tt>libvorbisfile</tt>.
|
||
|
|
For new code, you are likely better off using op_test() instead, which
|
||
|
|
is less resource-intensive, requires less data to succeed, and imposes a
|
||
|
|
hard limit on the amount of data it examines (important for unseekable
|
||
|
|
sources, where all such data must be buffered until you are sure of the
|
||
|
|
stream type).
|
||
|
|
\param _source The stream to read from (e.g., a <code>FILE *</code>).
|
||
|
|
\param _cb The callbacks with which to access the stream.
|
||
|
|
<code><a href="#op_read_func">read()</a></code> must
|
||
|
|
be implemented.
|
||
|
|
<code><a href="#op_seek_func">seek()</a></code> and
|
||
|
|
<code><a href="#op_tell_func">tell()</a></code> may
|
||
|
|
be <code>NULL</code>, or may always return -1 to
|
||
|
|
indicate a source is unseekable, but if
|
||
|
|
<code><a href="#op_seek_func">seek()</a></code> is
|
||
|
|
implemented and succeeds on a particular source, then
|
||
|
|
<code><a href="#op_tell_func">tell()</a></code> must
|
||
|
|
also.
|
||
|
|
<code><a href="#op_close_func">close()</a></code> may
|
||
|
|
be <code>NULL</code>, but if it is not, it will be
|
||
|
|
called when the \c OggOpusFile is destroyed by
|
||
|
|
op_free().
|
||
|
|
It will not be called if op_open_callbacks() fails
|
||
|
|
with an error.
|
||
|
|
\param _initial_data An initial buffer of data from the start of the
|
||
|
|
stream.
|
||
|
|
Applications can read some number of bytes from the
|
||
|
|
start of the stream to help identify this as an Opus
|
||
|
|
stream, and then provide them here to allow the
|
||
|
|
stream to be tested more thoroughly, even if it is
|
||
|
|
unseekable.
|
||
|
|
\param _initial_bytes The number of bytes in \a _initial_data.
|
||
|
|
If the stream is seekable, its current position (as
|
||
|
|
reported by
|
||
|
|
<code><a href="#opus_tell_func">tell()</a></code>
|
||
|
|
at the start of this function) must be equal to
|
||
|
|
\a _initial_bytes.
|
||
|
|
Otherwise, seeking to absolute positions will
|
||
|
|
generate inconsistent results.
|
||
|
|
\param[out] _error Returns 0 on success, or a failure code on error.
|
||
|
|
You may pass in <code>NULL</code> if you don't want
|
||
|
|
the failure code.
|
||
|
|
See op_open_callbacks() for a full list of failure
|
||
|
|
codes.
|
||
|
|
\return A partially opened \c OggOpusFile, or <code>NULL</code> on error.
|
||
|
|
<tt>libopusfile</tt> does <em>not</em> take ownership of the source
|
||
|
|
if the call fails.
|
||
|
|
The calling application is responsible for closing the source if
|
||
|
|
this call returns an error.*/
|
||
|
|
OP_WARN_UNUSED_RESULT OggOpusFile *op_test_callbacks(void *_source,
|
||
|
|
const OpusFileCallbacks *_cb,const unsigned char *_initial_data,
|
||
|
|
size_t _initial_bytes,int *_error) OP_ARG_NONNULL(2);
|
||
|
|
|
||
|
|
/**Finish opening a stream partially opened with op_test_callbacks() or one of
|
||
|
|
the associated convenience functions.
|
||
|
|
If this function fails, you are still responsible for freeing the
|
||
|
|
\c OggOpusFile with op_free().
|
||
|
|
\param _of The \c OggOpusFile to finish opening.
|
||
|
|
\return 0 on success, or a negative value on error.
|
||
|
|
\retval #OP_EREAD An underlying read, seek, or tell operation failed
|
||
|
|
when it should have succeeded.
|
||
|
|
\retval #OP_EFAULT There was a memory allocation failure, or an
|
||
|
|
internal library error.
|
||
|
|
\retval #OP_EIMPL The stream used a feature that is not implemented,
|
||
|
|
such as an unsupported channel family.
|
||
|
|
\retval #OP_EINVAL The stream was not partially opened with
|
||
|
|
op_test_callbacks() or one of the associated
|
||
|
|
convenience functions.
|
||
|
|
\retval #OP_ENOTFORMAT The stream contained a link that did not have any
|
||
|
|
logical Opus streams in it.
|
||
|
|
\retval #OP_EBADHEADER A required header packet was not properly
|
||
|
|
formatted, contained illegal values, or was
|
||
|
|
missing altogether.
|
||
|
|
\retval #OP_EVERSION An ID header contained an unrecognized version
|
||
|
|
number.
|
||
|
|
\retval #OP_EBADLINK We failed to find data we had seen before after
|
||
|
|
seeking.
|
||
|
|
\retval #OP_EBADTIMESTAMP The first or last timestamp in a link failed basic
|
||
|
|
validity checks.*/
|
||
|
|
int op_test_open(OggOpusFile *_of) OP_ARG_NONNULL(1);
|
||
|
|
|
||
|
|
/**Release all memory used by an \c OggOpusFile.
|
||
|
|
\param _of The \c OggOpusFile to free.*/
|
||
|
|
void op_free(OggOpusFile *_of);
|
||
|
|
|
||
|
|
/*@}*/
|
||
|
|
/*@}*/
|
||
|
|
|
||
|
|
/**\defgroup stream_info Stream Information*/
|
||
|
|
/*@{*/
|
||
|
|
/**\name Functions for obtaining information about streams
|
||
|
|
|
||
|
|
These functions allow you to get basic information about a stream, including
|
||
|
|
seekability, the number of links (for chained streams), plus the size,
|
||
|
|
duration, bitrate, header parameters, and meta information for each link
|
||
|
|
(or, where available, the stream as a whole).
|
||
|
|
Some of these (size, duration) are only available for seekable streams.
|
||
|
|
You can also query the current stream position, link, and playback time,
|
||
|
|
and instantaneous bitrate during playback.
|
||
|
|
|
||
|
|
Some of these functions may be used successfully on the partially open
|
||
|
|
streams returned by op_test_callbacks() or one of the associated
|
||
|
|
convenience functions.
|
||
|
|
Their documention will indicate so explicitly.*/
|
||
|
|
/*@{*/
|
||
|
|
|
||
|
|
/**Returns whether or not the data source being read is seekable.
|
||
|
|
This is true if
|
||
|
|
<ol>
|
||
|
|
<li>The <code><a href="#op_seek_func">seek()</a></code> and
|
||
|
|
<code><a href="#op_tell_func">tell()</a></code> callbacks are both
|
||
|
|
non-<code>NULL</code>,</li>
|
||
|
|
<li>The <code><a href="#op_seek_func">seek()</a></code> callback was
|
||
|
|
successfully executed at least once, and</li>
|
||
|
|
<li>The <code><a href="#op_tell_func">tell()</a></code> callback was
|
||
|
|
successfully able to report the position indicator afterwards.</li>
|
||
|
|
</ol>
|
||
|
|
This function may be called on partially-opened streams.
|
||
|
|
\param _of The \c OggOpusFile whose seekable status is to be returned.
|
||
|
|
\return A non-zero value if seekable, and 0 if unseekable.*/
|
||
|
|
int op_seekable(const OggOpusFile *_of) OP_ARG_NONNULL(1);
|
||
|
|
|
||
|
|
/**Returns the number of links in this chained stream.
|
||
|
|
This function may be called on partially-opened streams, but it will always
|
||
|
|
return 1.
|
||
|
|
The actual number of links is not known until the stream is fully opened.
|
||
|
|
\param _of The \c OggOpusFile from which to retrieve the link count.
|
||
|
|
\return For fully-open seekable sources, this returns the total number of
|
||
|
|
links in the whole stream, which will be at least 1.
|
||
|
|
For partially-open or unseekable sources, this always returns 1.*/
|
||
|
|
int op_link_count(const OggOpusFile *_of) OP_ARG_NONNULL(1);
|
||
|
|
|
||
|
|
/**Get the serial number of the given link in a (possibly-chained) Ogg Opus
|
||
|
|
stream.
|
||
|
|
This function may be called on partially-opened streams, but it will always
|
||
|
|
return the serial number of the Opus stream in the first link.
|
||
|
|
\param _of The \c OggOpusFile from which to retrieve the serial number.
|
||
|
|
\param _li The index of the link whose serial number should be retrieved.
|
||
|
|
Use a negative number to get the serial number of the current
|
||
|
|
link.
|
||
|
|
\return The serial number of the given link.
|
||
|
|
If \a _li is greater than the total number of links, this returns
|
||
|
|
the serial number of the last link.
|
||
|
|
If the source is not seekable, this always returns the serial number
|
||
|
|
of the current link.*/
|
||
|
|
opus_uint32 op_serialno(const OggOpusFile *_of,int _li) OP_ARG_NONNULL(1);
|
||
|
|
|
||
|
|
/**Get the channel count of the given link in a (possibly-chained) Ogg Opus
|
||
|
|
stream.
|
||
|
|
This is equivalent to <code>op_head(_of,_li)->channel_count</code>, but
|
||
|
|
is provided for convenience.
|
||
|
|
This function may be called on partially-opened streams, but it will always
|
||
|
|
return the channel count of the Opus stream in the first link.
|
||
|
|
\param _of The \c OggOpusFile from which to retrieve the channel count.
|
||
|
|
\param _li The index of the link whose channel count should be retrieved.
|
||
|
|
Use a negative number to get the channel count of the current
|
||
|
|
link.
|
||
|
|
\return The channel count of the given link.
|
||
|
|
If \a _li is greater than the total number of links, this returns
|
||
|
|
the channel count of the last link.
|
||
|
|
If the source is not seekable, this always returns the channel count
|
||
|
|
of the current link.*/
|
||
|
|
int op_channel_count(const OggOpusFile *_of,int _li) OP_ARG_NONNULL(1);
|
||
|
|
|
||
|
|
/**Get the total (compressed) size of the stream, or of an individual link in
|
||
|
|
a (possibly-chained) Ogg Opus stream, including all headers and Ogg muxing
|
||
|
|
overhead.
|
||
|
|
\warning If the Opus stream (or link) is concurrently multiplexed with other
|
||
|
|
logical streams (e.g., video), this returns the size of the entire stream
|
||
|
|
(or link), not just the number of bytes in the first logical Opus stream.
|
||
|
|
Returning the latter would require scanning the entire file.
|
||
|
|
\param _of The \c OggOpusFile from which to retrieve the compressed size.
|
||
|
|
\param _li The index of the link whose compressed size should be computed.
|
||
|
|
Use a negative number to get the compressed size of the entire
|
||
|
|
stream.
|
||
|
|
\return The compressed size of the entire stream if \a _li is negative, the
|
||
|
|
compressed size of link \a _li if it is non-negative, or a negative
|
||
|
|
value on error.
|
||
|
|
The compressed size of the entire stream may be smaller than that
|
||
|
|
of the underlying source if trailing garbage was detected in the
|
||
|
|
file.
|
||
|
|
\retval #OP_EINVAL The source is not seekable (so we can't know the length),
|
||
|
|
\a _li wasn't less than the total number of links in
|
||
|
|
the stream, or the stream was only partially open.*/
|
||
|
|
opus_int64 op_raw_total(const OggOpusFile *_of,int _li) OP_ARG_NONNULL(1);
|
||
|
|
|
||
|
|
/**Get the total PCM length (number of samples at 48 kHz) of the stream, or of
|
||
|
|
an individual link in a (possibly-chained) Ogg Opus stream.
|
||
|
|
Users looking for <code>op_time_total()</code> should use op_pcm_total()
|
||
|
|
instead.
|
||
|
|
Because timestamps in Opus are fixed at 48 kHz, there is no need for a
|
||
|
|
separate function to convert this to seconds (and leaving it out avoids
|
||
|
|
introducing floating point to the API, for those that wish to avoid it).
|
||
|
|
\param _of The \c OggOpusFile from which to retrieve the PCM offset.
|
||
|
|
\param _li The index of the link whose PCM length should be computed.
|
||
|
|
Use a negative number to get the PCM length of the entire stream.
|
||
|
|
\return The PCM length of the entire stream if \a _li is negative, the PCM
|
||
|
|
length of link \a _li if it is non-negative, or a negative value on
|
||
|
|
error.
|
||
|
|
\retval #OP_EINVAL The source is not seekable (so we can't know the length),
|
||
|
|
\a _li wasn't less than the total number of links in
|
||
|
|
the stream, or the stream was only partially open.*/
|
||
|
|
ogg_int64_t op_pcm_total(const OggOpusFile *_of,int _li) OP_ARG_NONNULL(1);
|
||
|
|
|
||
|
|
/**Get the ID header information for the given link in a (possibly chained) Ogg
|
||
|
|
Opus stream.
|
||
|
|
This function may be called on partially-opened streams, but it will always
|
||
|
|
return the ID header information of the Opus stream in the first link.
|
||
|
|
\param _of The \c OggOpusFile from which to retrieve the ID header
|
||
|
|
information.
|
||
|
|
\param _li The index of the link whose ID header information should be
|
||
|
|
retrieved.
|
||
|
|
Use a negative number to get the ID header information of the
|
||
|
|
current link.
|
||
|
|
For an unseekable stream, \a _li is ignored, and the ID header
|
||
|
|
information for the current link is always returned, if
|
||
|
|
available.
|
||
|
|
\return The contents of the ID header for the given link.*/
|
||
|
|
const OpusHead *op_head(const OggOpusFile *_of,int _li) OP_ARG_NONNULL(1);
|
||
|
|
|
||
|
|
/**Get the comment header information for the given link in a (possibly
|
||
|
|
chained) Ogg Opus stream.
|
||
|
|
This function may be called on partially-opened streams, but it will always
|
||
|
|
return the tags from the Opus stream in the first link.
|
||
|
|
\param _of The \c OggOpusFile from which to retrieve the comment header
|
||
|
|
information.
|
||
|
|
\param _li The index of the link whose comment header information should be
|
||
|
|
retrieved.
|
||
|
|
Use a negative number to get the comment header information of
|
||
|
|
the current link.
|
||
|
|
For an unseekable stream, \a _li is ignored, and the comment
|
||
|
|
header information for the current link is always returned, if
|
||
|
|
available.
|
||
|
|
\return The contents of the comment header for the given link, or
|
||
|
|
<code>NULL</code> if this is an unseekable stream that encountered
|
||
|
|
an invalid link.*/
|
||
|
|
const OpusTags *op_tags(const OggOpusFile *_of,int _li) OP_ARG_NONNULL(1);
|
||
|
|
|
||
|
|
/**Retrieve the index of the current link.
|
||
|
|
This is the link that produced the data most recently read by
|
||
|
|
op_read_float() or its associated functions, or, after a seek, the link
|
||
|
|
that the seek target landed in.
|
||
|
|
Reading more data may advance the link index (even on the first read after a
|
||
|
|
seek).
|
||
|
|
\param _of The \c OggOpusFile from which to retrieve the current link index.
|
||
|
|
\return The index of the current link on success, or a negative value on
|
||
|
|
failure.
|
||
|
|
For seekable streams, this is a number between 0 and the value
|
||
|
|
returned by op_link_count().
|
||
|
|
For unseekable streams, this value starts at 0 and increments by one
|
||
|
|
each time a new link is encountered (even though op_link_count()
|
||
|
|
always returns 1).
|
||
|
|
\retval #OP_EINVAL The stream was only partially open.*/
|
||
|
|
int op_current_link(const OggOpusFile *_of) OP_ARG_NONNULL(1);
|
||
|
|
|
||
|
|
/**Computes the bitrate of the stream, or of an individual link in a
|
||
|
|
(possibly-chained) Ogg Opus stream.
|
||
|
|
The stream must be seekable to compute the bitrate.
|
||
|
|
For unseekable streams, use op_bitrate_instant() to get periodic estimates.
|
||
|
|
\warning If the Opus stream (or link) is concurrently multiplexed with other
|
||
|
|
logical streams (e.g., video), this uses the size of the entire stream (or
|
||
|
|
link) to compute the bitrate, not just the number of bytes in the first
|
||
|
|
logical Opus stream.
|
||
|
|
Returning the latter requires scanning the entire file, but this may be done
|
||
|
|
by decoding the whole file and calling op_bitrate_instant() once at the
|
||
|
|
end.
|
||
|
|
Install a trivial decoding callback with op_set_decode_callback() if you
|
||
|
|
wish to skip actual decoding during this process.
|
||
|
|
\param _of The \c OggOpusFile from which to retrieve the bitrate.
|
||
|
|
\param _li The index of the link whose bitrate should be computed.
|
||
|
|
Use a negative number to get the bitrate of the whole stream.
|
||
|
|
\return The bitrate on success, or a negative value on error.
|
||
|
|
\retval #OP_EINVAL The stream was only partially open, the stream was not
|
||
|
|
seekable, or \a _li was larger than the number of
|
||
|
|
links.*/
|
||
|
|
opus_int32 op_bitrate(const OggOpusFile *_of,int _li) OP_ARG_NONNULL(1);
|
||
|
|
|
||
|
|
/**Compute the instantaneous bitrate, measured as the ratio of bits to playable
|
||
|
|
samples decoded since a) the last call to op_bitrate_instant(), b) the last
|
||
|
|
seek, or c) the start of playback, whichever was most recent.
|
||
|
|
This will spike somewhat after a seek or at the start/end of a chain
|
||
|
|
boundary, as pre-skip, pre-roll, and end-trimming causes samples to be
|
||
|
|
decoded but not played.
|
||
|
|
\param _of The \c OggOpusFile from which to retrieve the bitrate.
|
||
|
|
\return The bitrate, in bits per second, or a negative value on error.
|
||
|
|
\retval #OP_FALSE No data has been decoded since any of the events
|
||
|
|
described above.
|
||
|
|
\retval #OP_EINVAL The stream was only partially open.*/
|
||
|
|
opus_int32 op_bitrate_instant(OggOpusFile *_of) OP_ARG_NONNULL(1);
|
||
|
|
|
||
|
|
/**Obtain the current value of the position indicator for \a _of.
|
||
|
|
\param _of The \c OggOpusFile from which to retrieve the position indicator.
|
||
|
|
\return The byte position that is currently being read from.
|
||
|
|
\retval #OP_EINVAL The stream was only partially open.*/
|
||
|
|
opus_int64 op_raw_tell(const OggOpusFile *_of) OP_ARG_NONNULL(1);
|
||
|
|
|
||
|
|
/**Obtain the PCM offset of the next sample to be read.
|
||
|
|
If the stream is not properly timestamped, this might not increment by the
|
||
|
|
proper amount between reads, or even return monotonically increasing
|
||
|
|
values.
|
||
|
|
\param _of The \c OggOpusFile from which to retrieve the PCM offset.
|
||
|
|
\return The PCM offset of the next sample to be read.
|
||
|
|
\retval #OP_EINVAL The stream was only partially open.*/
|
||
|
|
ogg_int64_t op_pcm_tell(const OggOpusFile *_of) OP_ARG_NONNULL(1);
|
||
|
|
|
||
|
|
/*@}*/
|
||
|
|
/*@}*/
|
||
|
|
|
||
|
|
/**\defgroup stream_seeking Seeking*/
|
||
|
|
/*@{*/
|
||
|
|
/**\name Functions for seeking in Opus streams
|
||
|
|
|
||
|
|
These functions let you seek in Opus streams, if the underlying source
|
||
|
|
support it.
|
||
|
|
Seeking is implemented for all built-in stream I/O routines, though some
|
||
|
|
individual sources may not be seekable (pipes, live HTTP streams, or HTTP
|
||
|
|
streams from a server that does not support <code>Range</code> requests).
|
||
|
|
|
||
|
|
op_raw_seek() is the fastest: it is guaranteed to perform at most one
|
||
|
|
physical seek, but, since the target is a byte position, makes no guarantee
|
||
|
|
how close to a given time it will come.
|
||
|
|
op_pcm_seek() provides sample-accurate seeking.
|
||
|
|
The number of physical seeks it requires is still quite small (often 1 or
|
||
|
|
2, even in highly variable bitrate streams).
|
||
|
|
|
||
|
|
Seeking in Opus requires decoding some pre-roll amount before playback to
|
||
|
|
allow the internal state to converge (as if recovering from packet loss).
|
||
|
|
This is handled internally by <tt>libopusfile</tt>, but means there is
|
||
|
|
little extra overhead for decoding up to the exact position requested
|
||
|
|
(since it must decode some amount of audio anyway).
|
||
|
|
It also means that decoding after seeking may not return exactly the same
|
||
|
|
values as would be obtained by decoding the stream straight through.
|
||
|
|
However, such differences are expected to be smaller than the loss
|
||
|
|
introduced by Opus's lossy compression.*/
|
||
|
|
/*@{*/
|
||
|
|
|
||
|
|
/**Seek to a byte offset relative to the <b>compressed</b> data.
|
||
|
|
This also scans packets to update the PCM cursor.
|
||
|
|
It will cross a logical bitstream boundary, but only if it can't get any
|
||
|
|
packets out of the tail of the link to which it seeks.
|
||
|
|
\param _of The \c OggOpusFile in which to seek.
|
||
|
|
\param _byte_offset The byte position to seek to.
|
||
|
|
\return 0 on success, or a negative error code on failure.
|
||
|
|
\retval #OP_EREAD The underlying seek operation failed.
|
||
|
|
\retval #OP_EINVAL The stream was only partially open, or the target was
|
||
|
|
outside the valid range for the stream.
|
||
|
|
\retval #OP_ENOSEEK This stream is not seekable.
|
||
|
|
\retval #OP_EBADLINK Failed to initialize a decoder for a stream for an
|
||
|
|
unknown reason.*/
|
||
|
|
int op_raw_seek(OggOpusFile *_of,opus_int64 _byte_offset) OP_ARG_NONNULL(1);
|
||
|
|
|
||
|
|
/**Seek to the specified PCM offset, such that decoding will begin at exactly
|
||
|
|
the requested position.
|
||
|
|
\param _of The \c OggOpusFile in which to seek.
|
||
|
|
\param _pcm_offset The PCM offset to seek to.
|
||
|
|
This is in samples at 48 kHz relative to the start of the
|
||
|
|
stream.
|
||
|
|
\return 0 on success, or a negative value on error.
|
||
|
|
\retval #OP_EREAD An underlying read or seek operation failed.
|
||
|
|
\retval #OP_EINVAL The stream was only partially open, or the target was
|
||
|
|
outside the valid range for the stream.
|
||
|
|
\retval #OP_ENOSEEK This stream is not seekable.
|
||
|
|
\retval #OP_EBADLINK We failed to find data we had seen before, or the
|
||
|
|
bitstream structure was sufficiently malformed that
|
||
|
|
seeking to the target destination was impossible.*/
|
||
|
|
int op_pcm_seek(OggOpusFile *_of,ogg_int64_t _pcm_offset) OP_ARG_NONNULL(1);
|
||
|
|
|
||
|
|
/*@}*/
|
||
|
|
/*@}*/
|
||
|
|
|
||
|
|
/**\defgroup stream_decoding Decoding*/
|
||
|
|
/*@{*/
|
||
|
|
/**\name Functions for decoding audio data
|
||
|
|
|
||
|
|
These functions retrieve actual decoded audio data from the stream.
|
||
|
|
The general functions, op_read() and op_read_float() return 16-bit or
|
||
|
|
floating-point output, both using native endian ordering.
|
||
|
|
The number of channels returned can change from link to link in a chained
|
||
|
|
stream.
|
||
|
|
There are special functions, op_read_stereo() and op_read_float_stereo(),
|
||
|
|
which always output two channels, to simplify applications which do not
|
||
|
|
wish to handle multichannel audio.
|
||
|
|
These downmix multichannel files to two channels, so they can always return
|
||
|
|
samples in the same format for every link in a chained file.
|
||
|
|
|
||
|
|
If the rest of your audio processing chain can handle floating point, those
|
||
|
|
routines should be preferred, as floating point output avoids introducing
|
||
|
|
clipping and other issues which might be avoided entirely if, e.g., you
|
||
|
|
scale down the volume at some other stage.
|
||
|
|
However, if you intend to direct consume 16-bit samples, the conversion in
|
||
|
|
<tt>libopusfile</tt> provides noise-shaping dithering and, if compiled
|
||
|
|
against <tt>libopus</tt> 1.1 or later, soft-clipping prevention.
|
||
|
|
|
||
|
|
<tt>libopusfile</tt> can also be configured at compile time to use the
|
||
|
|
fixed-point <tt>libopus</tt> API.
|
||
|
|
If so, <tt>libopusfile</tt>'s floating-point API may also be disabled.
|
||
|
|
In that configuration, nothing in <tt>libopusfile</tt> will use any
|
||
|
|
floating-point operations, to simplify support on devices without an
|
||
|
|
adequate FPU.
|
||
|
|
|
||
|
|
\warning HTTPS streams may be be vulnerable to truncation attacks if you do
|
||
|
|
not check the error return code from op_read_float() or its associated
|
||
|
|
functions.
|
||
|
|
If the remote peer does not close the connection gracefully (with a TLS
|
||
|
|
"close notify" message), these functions will return #OP_EREAD instead of 0
|
||
|
|
when they reach the end of the file.
|
||
|
|
If you are reading from an <https:> URL (particularly if seeking is not
|
||
|
|
supported), you should make sure to check for this error and warn the user
|
||
|
|
appropriately.*/
|
||
|
|
/*@{*/
|
||
|
|
|
||
|
|
/**Indicates that the decoding callback should produce signed 16-bit
|
||
|
|
native-endian output samples.*/
|
||
|
|
#define OP_DEC_FORMAT_SHORT (7008)
|
||
|
|
/**Indicates that the decoding callback should produce 32-bit native-endian
|
||
|
|
float samples.*/
|
||
|
|
#define OP_DEC_FORMAT_FLOAT (7040)
|
||
|
|
|
||
|
|
/**Indicates that the decoding callback did not decode anything, and that
|
||
|
|
<tt>libopusfile</tt> should decode normally instead.*/
|
||
|
|
#define OP_DEC_USE_DEFAULT (6720)
|
||
|
|
|
||
|
|
/**Called to decode an Opus packet.
|
||
|
|
This should invoke the functional equivalent of opus_multistream_decode() or
|
||
|
|
opus_multistream_decode_float(), except that it returns 0 on success
|
||
|
|
instead of the number of decoded samples (which is known a priori).
|
||
|
|
\param _ctx The application-provided callback context.
|
||
|
|
\param _decoder The decoder to use to decode the packet.
|
||
|
|
\param[out] _pcm The buffer to decode into.
|
||
|
|
This will always have enough room for \a _nchannels of
|
||
|
|
\a _nsamples samples, which should be placed into this
|
||
|
|
buffer interleaved.
|
||
|
|
\param _op The packet to decode.
|
||
|
|
This will always have its granule position set to a valid
|
||
|
|
value.
|
||
|
|
\param _nsamples The number of samples expected from the packet.
|
||
|
|
\param _nchannels The number of channels expected from the packet.
|
||
|
|
\param _format The desired sample output format.
|
||
|
|
This is either #OP_DEC_FORMAT_SHORT or
|
||
|
|
#OP_DEC_FORMAT_FLOAT.
|
||
|
|
\param _li The index of the link from which this packet was decoded.
|
||
|
|
\return A non-negative value on success, or a negative value on error.
|
||
|
|
The error codes should be the same as those returned by
|
||
|
|
opus_multistream_decode() or opus_multistream_decode_float().
|
||
|
|
\retval 0 Decoding was successful.
|
||
|
|
The application has filled the buffer with
|
||
|
|
exactly <code>\a _nsamples*\a
|
||
|
|
_nchannels</code> samples in the requested
|
||
|
|
format.
|
||
|
|
\retval #OP_DEC_USE_DEFAULT No decoding was done.
|
||
|
|
<tt>libopusfile</tt> should decode normally
|
||
|
|
instead.*/
|
||
|
|
typedef int (*op_decode_cb_func)(void *_ctx,OpusMSDecoder *_decoder,void *_pcm,
|
||
|
|
const ogg_packet *_op,int _nsamples,int _nchannels,int _format,int _li);
|
||
|
|
|
||
|
|
/**Sets the packet decode callback function.
|
||
|
|
This is called once for each packet that needs to be decoded.
|
||
|
|
A call to this function is no guarantee that the audio will eventually be
|
||
|
|
delivered to the application.
|
||
|
|
Some or all of the data from the packet may be discarded (i.e., at the
|
||
|
|
beginning or end of a link, or after a seek), however the callback is
|
||
|
|
required to provide all of it.
|
||
|
|
\param _of The \c OggOpusFile on which to set the decode callback.
|
||
|
|
\param _decode_cb The callback function to call.
|
||
|
|
This may be <code>NULL</code> to disable calling the
|
||
|
|
callback.
|
||
|
|
\param _ctx The application-provided context pointer to pass to the
|
||
|
|
callback on each call.*/
|
||
|
|
void op_set_decode_callback(OggOpusFile *_of,
|
||
|
|
op_decode_cb_func _decode_cb,void *_ctx) OP_ARG_NONNULL(1);
|
||
|
|
|
||
|
|
/**Gain offset type that indicates that the provided offset is relative to the
|
||
|
|
header gain.
|
||
|
|
This is the default.*/
|
||
|
|
#define OP_HEADER_GAIN (0)
|
||
|
|
|
||
|
|
/**Gain offset type that indicates that the provided offset is relative to the
|
||
|
|
R128_TRACK_GAIN value (if any), in addition to the header gain.*/
|
||
|
|
#define OP_TRACK_GAIN (3008)
|
||
|
|
|
||
|
|
/**Gain offset type that indicates that the provided offset should be used as
|
||
|
|
the gain directly, without applying any the header or track gains.*/
|
||
|
|
#define OP_ABSOLUTE_GAIN (3009)
|
||
|
|
|
||
|
|
/**Sets the gain to be used for decoded output.
|
||
|
|
By default, the gain in the header is applied with no additional offset.
|
||
|
|
The total gain (including header gain and/or track gain, if applicable, and
|
||
|
|
this offset), will be clamped to [-32768,32767]/256 dB.
|
||
|
|
This is more than enough to saturate or underflow 16-bit PCM.
|
||
|
|
\note The new gain will not be applied to any already buffered, decoded
|
||
|
|
output.
|
||
|
|
This means you cannot change it sample-by-sample, as at best it will be
|
||
|
|
updated packet-by-packet.
|
||
|
|
It is meant for setting a target volume level, rather than applying smooth
|
||
|
|
fades, etc.
|
||
|
|
\param _of The \c OggOpusFile on which to set the gain offset.
|
||
|
|
\param _gain_type One of #OP_HEADER_GAIN, #OP_TRACK_GAIN, or
|
||
|
|
#OP_ABSOLUTE_GAIN.
|
||
|
|
\param _gain_offset_q8 The gain offset to apply, in 1/256ths of a dB.
|
||
|
|
\return 0 on success or a negative value on error.
|
||
|
|
\retval #OP_EINVAL The \a _gain_type was unrecognized.*/
|
||
|
|
int op_set_gain_offset(OggOpusFile *_of,
|
||
|
|
int _gain_type,opus_int32 _gain_offset_q8) OP_ARG_NONNULL(1);
|
||
|
|
|
||
|
|
/**Sets whether or not dithering is enabled for 16-bit decoding.
|
||
|
|
By default, when <tt>libopusfile</tt> is compiled to use floating-point
|
||
|
|
internally, calling op_read() or op_read_stereo() will first decode to
|
||
|
|
float, and then convert to fixed-point using noise-shaping dithering.
|
||
|
|
This flag can be used to disable that dithering.
|
||
|
|
When the application uses op_read_float() or op_read_float_stereo(), or when
|
||
|
|
the library has been compiled to decode directly to fixed point, this flag
|
||
|
|
has no effect.
|
||
|
|
\param _of The \c OggOpusFile on which to enable or disable dithering.
|
||
|
|
\param _enabled A non-zero value to enable dithering, or 0 to disable it.*/
|
||
|
|
void op_set_dither_enabled(OggOpusFile *_of,int _enabled) OP_ARG_NONNULL(1);
|
||
|
|
|
||
|
|
/**Reads more samples from the stream.
|
||
|
|
\note Although \a _buf_size must indicate the total number of values that
|
||
|
|
can be stored in \a _pcm, the return value is the number of samples
|
||
|
|
<em>per channel</em>.
|
||
|
|
This is done because
|
||
|
|
<ol>
|
||
|
|
<li>The channel count cannot be known a priori (reading more samples might
|
||
|
|
advance us into the next link, with a different channel count), so
|
||
|
|
\a _buf_size cannot also be in units of samples per channel,</li>
|
||
|
|
<li>Returning the samples per channel matches the <code>libopus</code> API
|
||
|
|
as closely as we're able,</li>
|
||
|
|
<li>Returning the total number of values instead of samples per channel
|
||
|
|
would mean the caller would need a division to compute the samples per
|
||
|
|
channel, and might worry about the possibility of getting back samples
|
||
|
|
for some channels and not others, and</li>
|
||
|
|
<li>This approach is relatively fool-proof: if an application passes too
|
||
|
|
small a value to \a _buf_size, they will simply get fewer samples back,
|
||
|
|
and if they assume the return value is the total number of values, then
|
||
|
|
they will simply read too few (rather than reading too many and going
|
||
|
|
off the end of the buffer).</li>
|
||
|
|
</ol>
|
||
|
|
\param _of The \c OggOpusFile from which to read.
|
||
|
|
\param[out] _pcm A buffer in which to store the output PCM samples, as
|
||
|
|
signed native-endian 16-bit values at 48 kHz
|
||
|
|
with a nominal range of <code>[-32768,32767)</code>.
|
||
|
|
Multiple channels are interleaved using the
|
||
|
|
<a href="http://www.xiph.org/vorbis/doc/Vorbis_I_spec.html#x1-800004.3.9">Vorbis
|
||
|
|
channel ordering</a>.
|
||
|
|
This must have room for at least \a _buf_size values.
|
||
|
|
\param _buf_size The number of values that can be stored in \a _pcm.
|
||
|
|
It is recommended that this be large enough for at
|
||
|
|
least 120 ms of data at 48 kHz per channel (5760
|
||
|
|
values per channel).
|
||
|
|
Smaller buffers will simply return less data, possibly
|
||
|
|
consuming more memory to buffer the data internally.
|
||
|
|
<tt>libopusfile</tt> may return less data than
|
||
|
|
requested.
|
||
|
|
If so, there is no guarantee that the remaining data
|
||
|
|
in \a _pcm will be unmodified.
|
||
|
|
\param[out] _li The index of the link this data was decoded from.
|
||
|
|
You may pass <code>NULL</code> if you do not need this
|
||
|
|
information.
|
||
|
|
If this function fails (returning a negative value),
|
||
|
|
this parameter is left unset.
|
||
|
|
\return The number of samples read per channel on success, or a negative
|
||
|
|
value on failure.
|
||
|
|
The channel count can be retrieved on success by calling
|
||
|
|
<code>op_head(_of,*_li)</code>.
|
||
|
|
The number of samples returned may be 0 if the buffer was too small
|
||
|
|
to store even a single sample for all channels, or if end-of-file
|
||
|
|
was reached.
|
||
|
|
The list of possible failure codes follows.
|
||
|
|
Most of them can only be returned by unseekable, chained streams
|
||
|
|
that encounter a new link.
|
||
|
|
\retval #OP_HOLE There was a hole in the data, and some samples
|
||
|
|
may have been skipped.
|
||
|
|
Call this function again to continue decoding
|
||
|
|
past the hole.
|
||
|
|
\retval #OP_EREAD An underlying read operation failed.
|
||
|
|
This may signal a truncation attack from an
|
||
|
|
<https:> source.
|
||
|
|
\retval #OP_EFAULT An internal memory allocation failed.
|
||
|
|
\retval #OP_EIMPL An unseekable stream encountered a new link that
|
||
|
|
used a feature that is not implemented, such as
|
||
|
|
an unsupported channel family.
|
||
|
|
\retval #OP_EINVAL The stream was only partially open.
|
||
|
|
\retval #OP_ENOTFORMAT An unseekable stream encountered a new link that
|
||
|
|
did not have any logical Opus streams in it.
|
||
|
|
\retval #OP_EBADHEADER An unseekable stream encountered a new link with a
|
||
|
|
required header packet that was not properly
|
||
|
|
formatted, contained illegal values, or was
|
||
|
|
missing altogether.
|
||
|
|
\retval #OP_EVERSION An unseekable stream encountered a new link with
|
||
|
|
an ID header that contained an unrecognized
|
||
|
|
version number.
|
||
|
|
\retval #OP_EBADPACKET Failed to properly decode the next packet.
|
||
|
|
\retval #OP_EBADLINK We failed to find data we had seen before.
|
||
|
|
\retval #OP_EBADTIMESTAMP An unseekable stream encountered a new link with
|
||
|
|
a starting timestamp that failed basic validity
|
||
|
|
checks.*/
|
||
|
|
OP_WARN_UNUSED_RESULT int op_read(OggOpusFile *_of,
|
||
|
|
opus_int16 *_pcm,int _buf_size,int *_li) OP_ARG_NONNULL(1);
|
||
|
|
|
||
|
|
/**Reads more samples from the stream.
|
||
|
|
\note Although \a _buf_size must indicate the total number of values that
|
||
|
|
can be stored in \a _pcm, the return value is the number of samples
|
||
|
|
<em>per channel</em>.
|
||
|
|
<ol>
|
||
|
|
<li>The channel count cannot be known a priori (reading more samples might
|
||
|
|
advance us into the next link, with a different channel count), so
|
||
|
|
\a _buf_size cannot also be in units of samples per channel,</li>
|
||
|
|
<li>Returning the samples per channel matches the <code>libopus</code> API
|
||
|
|
as closely as we're able,</li>
|
||
|
|
<li>Returning the total number of values instead of samples per channel
|
||
|
|
would mean the caller would need a division to compute the samples per
|
||
|
|
channel, and might worry about the possibility of getting back samples
|
||
|
|
for some channels and not others, and</li>
|
||
|
|
<li>This approach is relatively fool-proof: if an application passes too
|
||
|
|
small a value to \a _buf_size, they will simply get fewer samples back,
|
||
|
|
and if they assume the return value is the total number of values, then
|
||
|
|
they will simply read too few (rather than reading too many and going
|
||
|
|
off the end of the buffer).</li>
|
||
|
|
</ol>
|
||
|
|
\param _of The \c OggOpusFile from which to read.
|
||
|
|
\param[out] _pcm A buffer in which to store the output PCM samples as
|
||
|
|
signed floats at 48 kHz with a nominal range of
|
||
|
|
<code>[-1.0,1.0]</code>.
|
||
|
|
Multiple channels are interleaved using the
|
||
|
|
<a href="http://www.xiph.org/vorbis/doc/Vorbis_I_spec.html#x1-800004.3.9">Vorbis
|
||
|
|
channel ordering</a>.
|
||
|
|
This must have room for at least \a _buf_size floats.
|
||
|
|
\param _buf_size The number of floats that can be stored in \a _pcm.
|
||
|
|
It is recommended that this be large enough for at
|
||
|
|
least 120 ms of data at 48 kHz per channel (5760
|
||
|
|
samples per channel).
|
||
|
|
Smaller buffers will simply return less data, possibly
|
||
|
|
consuming more memory to buffer the data internally.
|
||
|
|
If less than \a _buf_size values are returned,
|
||
|
|
<tt>libopusfile</tt> makes no guarantee that the
|
||
|
|
remaining data in \a _pcm will be unmodified.
|
||
|
|
\param[out] _li The index of the link this data was decoded from.
|
||
|
|
You may pass <code>NULL</code> if you do not need this
|
||
|
|
information.
|
||
|
|
If this function fails (returning a negative value),
|
||
|
|
this parameter is left unset.
|
||
|
|
\return The number of samples read per channel on success, or a negative
|
||
|
|
value on failure.
|
||
|
|
The channel count can be retrieved on success by calling
|
||
|
|
<code>op_head(_of,*_li)</code>.
|
||
|
|
The number of samples returned may be 0 if the buffer was too small
|
||
|
|
to store even a single sample for all channels, or if end-of-file
|
||
|
|
was reached.
|
||
|
|
The list of possible failure codes follows.
|
||
|
|
Most of them can only be returned by unseekable, chained streams
|
||
|
|
that encounter a new link.
|
||
|
|
\retval #OP_HOLE There was a hole in the data, and some samples
|
||
|
|
may have been skipped.
|
||
|
|
Call this function again to continue decoding
|
||
|
|
past the hole.
|
||
|
|
\retval #OP_EREAD An underlying read operation failed.
|
||
|
|
This may signal a truncation attack from an
|
||
|
|
<https:> source.
|
||
|
|
\retval #OP_EFAULT An internal memory allocation failed.
|
||
|
|
\retval #OP_EIMPL An unseekable stream encountered a new link that
|
||
|
|
used a feature that is not implemented, such as
|
||
|
|
an unsupported channel family.
|
||
|
|
\retval #OP_EINVAL The stream was only partially open.
|
||
|
|
\retval #OP_ENOTFORMAT An unseekable stream encountered a new link that
|
||
|
|
did not have any logical Opus streams in it.
|
||
|
|
\retval #OP_EBADHEADER An unseekable stream encountered a new link with a
|
||
|
|
required header packet that was not properly
|
||
|
|
formatted, contained illegal values, or was
|
||
|
|
missing altogether.
|
||
|
|
\retval #OP_EVERSION An unseekable stream encountered a new link with
|
||
|
|
an ID header that contained an unrecognized
|
||
|
|
version number.
|
||
|
|
\retval #OP_EBADPACKET Failed to properly decode the next packet.
|
||
|
|
\retval #OP_EBADLINK We failed to find data we had seen before.
|
||
|
|
\retval #OP_EBADTIMESTAMP An unseekable stream encountered a new link with
|
||
|
|
a starting timestamp that failed basic validity
|
||
|
|
checks.*/
|
||
|
|
OP_WARN_UNUSED_RESULT int op_read_float(OggOpusFile *_of,
|
||
|
|
float *_pcm,int _buf_size,int *_li) OP_ARG_NONNULL(1);
|
||
|
|
|
||
|
|
/**Reads more samples from the stream and downmixes to stereo, if necessary.
|
||
|
|
This function is intended for simple players that want a uniform output
|
||
|
|
format, even if the channel count changes between links in a chained
|
||
|
|
stream.
|
||
|
|
\note \a _buf_size indicates the total number of values that can be stored
|
||
|
|
in \a _pcm, while the return value is the number of samples <em>per
|
||
|
|
channel</em>, even though the channel count is known, for consistency with
|
||
|
|
op_read().
|
||
|
|
\param _of The \c OggOpusFile from which to read.
|
||
|
|
\param[out] _pcm A buffer in which to store the output PCM samples, as
|
||
|
|
signed native-endian 16-bit values at 48 kHz
|
||
|
|
with a nominal range of <code>[-32768,32767)</code>.
|
||
|
|
The left and right channels are interleaved in the
|
||
|
|
buffer.
|
||
|
|
This must have room for at least \a _buf_size values.
|
||
|
|
\param _buf_size The number of values that can be stored in \a _pcm.
|
||
|
|
It is recommended that this be large enough for at
|
||
|
|
least 120 ms of data at 48 kHz per channel (11520
|
||
|
|
values total).
|
||
|
|
Smaller buffers will simply return less data, possibly
|
||
|
|
consuming more memory to buffer the data internally.
|
||
|
|
If less than \a _buf_size values are returned,
|
||
|
|
<tt>libopusfile</tt> makes no guarantee that the
|
||
|
|
remaining data in \a _pcm will be unmodified.
|
||
|
|
\return The number of samples read per channel on success, or a negative
|
||
|
|
value on failure.
|
||
|
|
The number of samples returned may be 0 if the buffer was too small
|
||
|
|
to store even a single sample for both channels, or if end-of-file
|
||
|
|
was reached.
|
||
|
|
The list of possible failure codes follows.
|
||
|
|
Most of them can only be returned by unseekable, chained streams
|
||
|
|
that encounter a new link.
|
||
|
|
\retval #OP_HOLE There was a hole in the data, and some samples
|
||
|
|
may have been skipped.
|
||
|
|
Call this function again to continue decoding
|
||
|
|
past the hole.
|
||
|
|
\retval #OP_EREAD An underlying read operation failed.
|
||
|
|
This may signal a truncation attack from an
|
||
|
|
<https:> source.
|
||
|
|
\retval #OP_EFAULT An internal memory allocation failed.
|
||
|
|
\retval #OP_EIMPL An unseekable stream encountered a new link that
|
||
|
|
used a feature that is not implemented, such as
|
||
|
|
an unsupported channel family.
|
||
|
|
\retval #OP_EINVAL The stream was only partially open.
|
||
|
|
\retval #OP_ENOTFORMAT An unseekable stream encountered a new link that
|
||
|
|
did not have any logical Opus streams in it.
|
||
|
|
\retval #OP_EBADHEADER An unseekable stream encountered a new link with a
|
||
|
|
required header packet that was not properly
|
||
|
|
formatted, contained illegal values, or was
|
||
|
|
missing altogether.
|
||
|
|
\retval #OP_EVERSION An unseekable stream encountered a new link with
|
||
|
|
an ID header that contained an unrecognized
|
||
|
|
version number.
|
||
|
|
\retval #OP_EBADPACKET Failed to properly decode the next packet.
|
||
|
|
\retval #OP_EBADLINK We failed to find data we had seen before.
|
||
|
|
\retval #OP_EBADTIMESTAMP An unseekable stream encountered a new link with
|
||
|
|
a starting timestamp that failed basic validity
|
||
|
|
checks.*/
|
||
|
|
OP_WARN_UNUSED_RESULT int op_read_stereo(OggOpusFile *_of,
|
||
|
|
opus_int16 *_pcm,int _buf_size) OP_ARG_NONNULL(1);
|
||
|
|
|
||
|
|
/**Reads more samples from the stream and downmixes to stereo, if necessary.
|
||
|
|
This function is intended for simple players that want a uniform output
|
||
|
|
format, even if the channel count changes between links in a chained
|
||
|
|
stream.
|
||
|
|
\note \a _buf_size indicates the total number of values that can be stored
|
||
|
|
in \a _pcm, while the return value is the number of samples <em>per
|
||
|
|
channel</em>, even though the channel count is known, for consistency with
|
||
|
|
op_read_float().
|
||
|
|
\param _of The \c OggOpusFile from which to read.
|
||
|
|
\param[out] _pcm A buffer in which to store the output PCM samples, as
|
||
|
|
signed floats at 48 kHz with a nominal range of
|
||
|
|
<code>[-1.0,1.0]</code>.
|
||
|
|
The left and right channels are interleaved in the
|
||
|
|
buffer.
|
||
|
|
This must have room for at least \a _buf_size values.
|
||
|
|
\param _buf_size The number of values that can be stored in \a _pcm.
|
||
|
|
It is recommended that this be large enough for at
|
||
|
|
least 120 ms of data at 48 kHz per channel (11520
|
||
|
|
values total).
|
||
|
|
Smaller buffers will simply return less data, possibly
|
||
|
|
consuming more memory to buffer the data internally.
|
||
|
|
If less than \a _buf_size values are returned,
|
||
|
|
<tt>libopusfile</tt> makes no guarantee that the
|
||
|
|
remaining data in \a _pcm will be unmodified.
|
||
|
|
\return The number of samples read per channel on success, or a negative
|
||
|
|
value on failure.
|
||
|
|
The number of samples returned may be 0 if the buffer was too small
|
||
|
|
to store even a single sample for both channels, or if end-of-file
|
||
|
|
was reached.
|
||
|
|
The list of possible failure codes follows.
|
||
|
|
Most of them can only be returned by unseekable, chained streams
|
||
|
|
that encounter a new link.
|
||
|
|
\retval #OP_HOLE There was a hole in the data, and some samples
|
||
|
|
may have been skipped.
|
||
|
|
Call this function again to continue decoding
|
||
|
|
past the hole.
|
||
|
|
\retval #OP_EREAD An underlying read operation failed.
|
||
|
|
This may signal a truncation attack from an
|
||
|
|
<https:> source.
|
||
|
|
\retval #OP_EFAULT An internal memory allocation failed.
|
||
|
|
\retval #OP_EIMPL An unseekable stream encountered a new link that
|
||
|
|
used a feature that is not implemented, such as
|
||
|
|
an unsupported channel family.
|
||
|
|
\retval #OP_EINVAL The stream was only partially open.
|
||
|
|
\retval #OP_ENOTFORMAT An unseekable stream encountered a new link that
|
||
|
|
that did not have any logical Opus streams in it.
|
||
|
|
\retval #OP_EBADHEADER An unseekable stream encountered a new link with a
|
||
|
|
required header packet that was not properly
|
||
|
|
formatted, contained illegal values, or was
|
||
|
|
missing altogether.
|
||
|
|
\retval #OP_EVERSION An unseekable stream encountered a new link with
|
||
|
|
an ID header that contained an unrecognized
|
||
|
|
version number.
|
||
|
|
\retval #OP_EBADPACKET Failed to properly decode the next packet.
|
||
|
|
\retval #OP_EBADLINK We failed to find data we had seen before.
|
||
|
|
\retval #OP_EBADTIMESTAMP An unseekable stream encountered a new link with
|
||
|
|
a starting timestamp that failed basic validity
|
||
|
|
checks.*/
|
||
|
|
OP_WARN_UNUSED_RESULT int op_read_float_stereo(OggOpusFile *_of,
|
||
|
|
float *_pcm,int _buf_size) OP_ARG_NONNULL(1);
|
||
|
|
|
||
|
|
/*@}*/
|
||
|
|
/*@}*/
|
||
|
|
|
||
|
|
# if OP_GNUC_PREREQ(4,0)
|
||
|
|
# pragma GCC visibility pop
|
||
|
|
# endif
|
||
|
|
|
||
|
|
# if defined(__cplusplus)
|
||
|
|
}
|
||
|
|
# endif
|
||
|
|
|
||
|
|
#endif
|