379 lines
16 KiB
C++
379 lines
16 KiB
C++
/*
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* Copyright (c) 2010 The WebM project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#ifndef VPX_VPX_DECODER_H_
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#define VPX_VPX_DECODER_H_
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/*!\defgroup decoder Decoder Algorithm Interface
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* \ingroup codec
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* This abstraction allows applications using this decoder to easily support
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* multiple video formats with minimal code duplication. This section describes
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* the interface common to all decoders.
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* @{
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*/
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/*!\file
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* \brief Describes the decoder algorithm interface to applications.
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*
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* This file describes the interface between an application and a
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* video decoder algorithm.
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*
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*/
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include "./vpx_codec.h"
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#include "./vpx_frame_buffer.h"
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/*!\brief Current ABI version number
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*
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* \internal
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* If this file is altered in any way that changes the ABI, this value
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* must be bumped. Examples include, but are not limited to, changing
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* types, removing or reassigning enums, adding/removing/rearranging
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* fields to structures
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*/
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#define VPX_DECODER_ABI_VERSION (3 + VPX_CODEC_ABI_VERSION) /**<\hideinitializer*/
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/*! \brief Decoder capabilities bitfield
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*
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* Each decoder advertises the capabilities it supports as part of its
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* ::vpx_codec_iface_t interface structure. Capabilities are extra interfaces
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* or functionality, and are not required to be supported by a decoder.
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*
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* The available flags are specified by VPX_CODEC_CAP_* defines.
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*/
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#define VPX_CODEC_CAP_PUT_SLICE 0x10000 /**< Will issue put_slice callbacks */
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#define VPX_CODEC_CAP_PUT_FRAME 0x20000 /**< Will issue put_frame callbacks */
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#define VPX_CODEC_CAP_POSTPROC 0x40000 /**< Can postprocess decoded frame */
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#define VPX_CODEC_CAP_ERROR_CONCEALMENT 0x80000 /**< Can conceal errors due to
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packet loss */
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#define VPX_CODEC_CAP_INPUT_FRAGMENTS 0x100000 /**< Can receive encoded frames
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one fragment at a time */
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/*! \brief Initialization-time Feature Enabling
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*
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* Certain codec features must be known at initialization time, to allow for
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* proper memory allocation.
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*
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* The available flags are specified by VPX_CODEC_USE_* defines.
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*/
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#define VPX_CODEC_CAP_FRAME_THREADING 0x200000 /**< Can support frame-based
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multi-threading */
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#define VPX_CODEC_CAP_EXTERNAL_FRAME_BUFFER 0x400000 /**< Can support external
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frame buffers */
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#define VPX_CODEC_USE_POSTPROC 0x10000 /**< Postprocess decoded frame */
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#define VPX_CODEC_USE_ERROR_CONCEALMENT 0x20000 /**< Conceal errors in decoded
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frames */
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#define VPX_CODEC_USE_INPUT_FRAGMENTS 0x40000 /**< The input frame should be
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passed to the decoder one
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fragment at a time */
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#define VPX_CODEC_USE_FRAME_THREADING 0x80000 /**< Enable frame-based
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multi-threading */
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/*!\brief Stream properties
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*
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* This structure is used to query or set properties of the decoded
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* stream. Algorithms may extend this structure with data specific
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* to their bitstream by setting the sz member appropriately.
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*/
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typedef struct vpx_codec_stream_info {
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unsigned int sz; /**< Size of this structure */
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unsigned int w; /**< Width (or 0 for unknown/default) */
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unsigned int h; /**< Height (or 0 for unknown/default) */
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unsigned int is_kf; /**< Current frame is a keyframe */
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} vpx_codec_stream_info_t;
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/* REQUIRED FUNCTIONS
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*
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* The following functions are required to be implemented for all decoders.
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* They represent the base case functionality expected of all decoders.
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*/
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/*!\brief Initialization Configurations
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*
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* This structure is used to pass init time configuration options to the
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* decoder.
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*/
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typedef struct vpx_codec_dec_cfg {
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unsigned int threads; /**< Maximum number of threads to use, default 1 */
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unsigned int w; /**< Width */
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unsigned int h; /**< Height */
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} vpx_codec_dec_cfg_t; /**< alias for struct vpx_codec_dec_cfg */
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/*!\brief Initialize a decoder instance
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*
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* Initializes a decoder context using the given interface. Applications
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* should call the vpx_codec_dec_init convenience macro instead of this
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* function directly, to ensure that the ABI version number parameter
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* is properly initialized.
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*
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* If the library was configured with --disable-multithread, this call
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* is not thread safe and should be guarded with a lock if being used
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* in a multithreaded context.
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*
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* \param[in] ctx Pointer to this instance's context.
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* \param[in] iface Pointer to the algorithm interface to use.
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* \param[in] cfg Configuration to use, if known. May be NULL.
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* \param[in] flags Bitfield of VPX_CODEC_USE_* flags
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* \param[in] ver ABI version number. Must be set to
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* VPX_DECODER_ABI_VERSION
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* \retval #VPX_CODEC_OK
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* The decoder algorithm initialized.
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* \retval #VPX_CODEC_MEM_ERROR
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* Memory allocation failed.
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*/
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vpx_codec_err_t vpx_codec_dec_init_ver(vpx_codec_ctx_t *ctx,
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vpx_codec_iface_t *iface,
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const vpx_codec_dec_cfg_t *cfg,
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vpx_codec_flags_t flags,
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int ver);
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/*!\brief Convenience macro for vpx_codec_dec_init_ver()
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*
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* Ensures the ABI version parameter is properly set.
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*/
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#define vpx_codec_dec_init(ctx, iface, cfg, flags) \
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vpx_codec_dec_init_ver(ctx, iface, cfg, flags, VPX_DECODER_ABI_VERSION)
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/*!\brief Parse stream info from a buffer
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*
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* Performs high level parsing of the bitstream. Construction of a decoder
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* context is not necessary. Can be used to determine if the bitstream is
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* of the proper format, and to extract information from the stream.
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*
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* \param[in] iface Pointer to the algorithm interface
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* \param[in] data Pointer to a block of data to parse
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* \param[in] data_sz Size of the data buffer
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* \param[in,out] si Pointer to stream info to update. The size member
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* \ref MUST be properly initialized, but \ref MAY be
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* clobbered by the algorithm. This parameter \ref MAY
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* be NULL.
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*
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* \retval #VPX_CODEC_OK
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* Bitstream is parsable and stream information updated
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*/
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vpx_codec_err_t vpx_codec_peek_stream_info(vpx_codec_iface_t *iface,
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const uint8_t *data,
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unsigned int data_sz,
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vpx_codec_stream_info_t *si);
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/*!\brief Return information about the current stream.
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*
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* Returns information about the stream that has been parsed during decoding.
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*
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* \param[in] ctx Pointer to this instance's context
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* \param[in,out] si Pointer to stream info to update. The size member
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* \ref MUST be properly initialized, but \ref MAY be
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* clobbered by the algorithm. This parameter \ref MAY
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* be NULL.
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*
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* \retval #VPX_CODEC_OK
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* Bitstream is parsable and stream information updated
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*/
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vpx_codec_err_t vpx_codec_get_stream_info(vpx_codec_ctx_t *ctx,
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vpx_codec_stream_info_t *si);
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/*!\brief Decode data
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*
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* Processes a buffer of coded data. If the processing results in a new
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* decoded frame becoming available, PUT_SLICE and PUT_FRAME events may be
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* generated, as appropriate. Encoded data \ref MUST be passed in DTS (decode
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* time stamp) order. Frames produced will always be in PTS (presentation
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* time stamp) order.
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* If the decoder is configured with VPX_CODEC_USE_INPUT_FRAGMENTS enabled,
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* data and data_sz can contain a fragment of the encoded frame. Fragment
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* \#n must contain at least partition \#n, but can also contain subsequent
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* partitions (\#n+1 - \#n+i), and if so, fragments \#n+1, .., \#n+i must
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* be empty. When no more data is available, this function should be called
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* with NULL as data and 0 as data_sz. The memory passed to this function
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* must be available until the frame has been decoded.
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*
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* \param[in] ctx Pointer to this instance's context
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* \param[in] data Pointer to this block of new coded data. If
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* NULL, a VPX_CODEC_CB_PUT_FRAME event is posted
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* for the previously decoded frame.
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* \param[in] data_sz Size of the coded data, in bytes.
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* \param[in] user_priv Application specific data to associate with
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* this frame.
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* \param[in] deadline Soft deadline the decoder should attempt to meet,
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* in us. Set to zero for unlimited.
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*
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* \return Returns #VPX_CODEC_OK if the coded data was processed completely
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* and future pictures can be decoded without error. Otherwise,
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* see the descriptions of the other error codes in ::vpx_codec_err_t
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* for recoverability capabilities.
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*/
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vpx_codec_err_t vpx_codec_decode(vpx_codec_ctx_t *ctx,
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const uint8_t *data,
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unsigned int data_sz,
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void *user_priv,
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long deadline);
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/*!\brief Decoded frames iterator
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*
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* Iterates over a list of the frames available for display. The iterator
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* storage should be initialized to NULL to start the iteration. Iteration is
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* complete when this function returns NULL.
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*
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* The list of available frames becomes valid upon completion of the
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* vpx_codec_decode call, and remains valid until the next call to vpx_codec_decode.
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*
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* \param[in] ctx Pointer to this instance's context
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* \param[in,out] iter Iterator storage, initialized to NULL
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*
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* \return Returns a pointer to an image, if one is ready for display. Frames
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* produced will always be in PTS (presentation time stamp) order.
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*/
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vpx_image_t *vpx_codec_get_frame(vpx_codec_ctx_t *ctx,
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vpx_codec_iter_t *iter);
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/*!\defgroup cap_put_frame Frame-Based Decoding Functions
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*
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* The following functions are required to be implemented for all decoders
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* that advertise the VPX_CODEC_CAP_PUT_FRAME capability. Calling these functions
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* for codecs that don't advertise this capability will result in an error
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* code being returned, usually VPX_CODEC_ERROR
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* @{
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*/
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/*!\brief put frame callback prototype
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*
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* This callback is invoked by the decoder to notify the application of
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* the availability of decoded image data.
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*/
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typedef void (*vpx_codec_put_frame_cb_fn_t)(void *user_priv,
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const vpx_image_t *img);
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/*!\brief Register for notification of frame completion.
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*
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* Registers a given function to be called when a decoded frame is
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* available.
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*
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* \param[in] ctx Pointer to this instance's context
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* \param[in] cb Pointer to the callback function
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* \param[in] user_priv User's private data
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*
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* \retval #VPX_CODEC_OK
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* Callback successfully registered.
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* \retval #VPX_CODEC_ERROR
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* Decoder context not initialized, or algorithm not capable of
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* posting slice completion.
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*/
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vpx_codec_err_t vpx_codec_register_put_frame_cb(vpx_codec_ctx_t *ctx,
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vpx_codec_put_frame_cb_fn_t cb,
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void *user_priv);
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/*!@} - end defgroup cap_put_frame */
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/*!\defgroup cap_put_slice Slice-Based Decoding Functions
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*
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* The following functions are required to be implemented for all decoders
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* that advertise the VPX_CODEC_CAP_PUT_SLICE capability. Calling these functions
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* for codecs that don't advertise this capability will result in an error
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* code being returned, usually VPX_CODEC_ERROR
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* @{
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*/
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/*!\brief put slice callback prototype
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*
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* This callback is invoked by the decoder to notify the application of
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* the availability of partially decoded image data. The
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*/
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typedef void (*vpx_codec_put_slice_cb_fn_t)(void *user_priv,
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const vpx_image_t *img,
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const vpx_image_rect_t *valid,
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const vpx_image_rect_t *update);
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/*!\brief Register for notification of slice completion.
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*
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* Registers a given function to be called when a decoded slice is
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* available.
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*
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* \param[in] ctx Pointer to this instance's context
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* \param[in] cb Pointer to the callback function
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* \param[in] user_priv User's private data
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*
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* \retval #VPX_CODEC_OK
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* Callback successfully registered.
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* \retval #VPX_CODEC_ERROR
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* Decoder context not initialized, or algorithm not capable of
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* posting slice completion.
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*/
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vpx_codec_err_t vpx_codec_register_put_slice_cb(vpx_codec_ctx_t *ctx,
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vpx_codec_put_slice_cb_fn_t cb,
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void *user_priv);
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/*!@} - end defgroup cap_put_slice*/
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/*!\defgroup cap_external_frame_buffer External Frame Buffer Functions
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*
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* The following section is required to be implemented for all decoders
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* that advertise the VPX_CODEC_CAP_EXTERNAL_FRAME_BUFFER capability.
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* Calling this function for codecs that don't advertise this capability
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* will result in an error code being returned, usually VPX_CODEC_ERROR.
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*
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* \note
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* Currently this only works with VP9.
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* @{
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*/
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/*!\brief Pass in external frame buffers for the decoder to use.
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*
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* Registers functions to be called when libvpx needs a frame buffer
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* to decode the current frame and a function to be called when libvpx does
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* not internally reference the frame buffer. This set function must
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* be called before the first call to decode or libvpx will assume the
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* default behavior of allocating frame buffers internally.
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*
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* \param[in] ctx Pointer to this instance's context
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* \param[in] cb_get Pointer to the get callback function
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* \param[in] cb_release Pointer to the release callback function
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* \param[in] cb_priv Callback's private data
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*
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* \retval #VPX_CODEC_OK
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* External frame buffers will be used by libvpx.
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* \retval #VPX_CODEC_INVALID_PARAM
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* One or more of the callbacks were NULL.
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* \retval #VPX_CODEC_ERROR
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* Decoder context not initialized, or algorithm not capable of
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* using external frame buffers.
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*
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* \note
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* When decoding VP9, the application may be required to pass in at least
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* #VP9_MAXIMUM_REF_BUFFERS + #VPX_MAXIMUM_WORK_BUFFERS external frame
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* buffers.
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*/
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vpx_codec_err_t vpx_codec_set_frame_buffer_functions(
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vpx_codec_ctx_t *ctx,
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vpx_get_frame_buffer_cb_fn_t cb_get,
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vpx_release_frame_buffer_cb_fn_t cb_release, void *cb_priv);
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/*!@} - end defgroup cap_external_frame_buffer */
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/*!@} - end defgroup decoder*/
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#ifdef __cplusplus
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}
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#endif
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#endif // VPX_VPX_DECODER_H_
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