204 lines
9.0 KiB
C
204 lines
9.0 KiB
C
|
/* Copyright (C) 2002-2006 Jean-Marc Valin */
|
||
|
|
/**
|
||
|
|
@file nb_celp.h
|
||
|
|
@brief Narrowband CELP encoder/decoder
|
||
|
|
*/
|
||
|
|
/*
|
||
|
|
Redistribution and use in source and binary forms, with or without
|
||
|
|
modification, are permitted provided that the following conditions
|
||
|
|
are met:
|
||
|
|
|
||
|
|
- Redistributions of source code must retain the above copyright
|
||
|
|
notice, this list of conditions and the following disclaimer.
|
||
|
|
|
||
|
|
- Redistributions in binary form must reproduce the above copyright
|
||
|
|
notice, this list of conditions and the following disclaimer in the
|
||
|
|
documentation and/or other materials provided with the distribution.
|
||
|
|
|
||
|
|
- Neither the name of the Xiph.org Foundation nor the names of its
|
||
|
|
contributors may be used to endorse or promote products derived from
|
||
|
|
this software without specific prior written permission.
|
||
|
|
|
||
|
|
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
||
|
|
``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
||
|
|
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
|
||
|
|
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR
|
||
|
|
CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
|
||
|
|
EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
|
||
|
|
PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
|
||
|
|
PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
|
||
|
|
LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
|
||
|
|
NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
|
||
|
|
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
||
|
|
|
||
|
|
*/
|
||
|
|
|
||
|
|
#ifndef NB_CELP_H
|
||
|
|
#define NB_CELP_H
|
||
|
|
|
||
|
|
#include "modes.h"
|
||
|
|
#include <speex/speex_bits.h>
|
||
|
|
#include <speex/speex_callbacks.h>
|
||
|
|
#include "vbr.h"
|
||
|
|
#include "filters.h"
|
||
|
|
|
||
|
|
#ifdef VORBIS_PSYCHO
|
||
|
|
#include "vorbis_psy.h"
|
||
|
|
#endif
|
||
|
|
|
||
|
|
/**Structure representing the full state of the narrowband encoder*/
|
||
|
|
typedef struct EncState {
|
||
|
|
const SpeexMode *mode; /**< Mode corresponding to the state */
|
||
|
|
int first; /**< Is this the first frame? */
|
||
|
|
int frameSize; /**< Size of frames */
|
||
|
|
int subframeSize; /**< Size of sub-frames */
|
||
|
|
int nbSubframes; /**< Number of sub-frames */
|
||
|
|
int windowSize; /**< Analysis (LPC) window length */
|
||
|
|
int lpcSize; /**< LPC order */
|
||
|
|
int min_pitch; /**< Minimum pitch value allowed */
|
||
|
|
int max_pitch; /**< Maximum pitch value allowed */
|
||
|
|
|
||
|
|
spx_word32_t cumul_gain; /**< Product of previously used pitch gains (Q10) */
|
||
|
|
int bounded_pitch; /**< Next frame should not rely on previous frames for pitch */
|
||
|
|
int ol_pitch; /**< Open-loop pitch */
|
||
|
|
int ol_voiced; /**< Open-loop voiced/non-voiced decision */
|
||
|
|
int *pitch;
|
||
|
|
|
||
|
|
#ifdef VORBIS_PSYCHO
|
||
|
|
VorbisPsy *psy;
|
||
|
|
float *psy_window;
|
||
|
|
float *curve;
|
||
|
|
float *old_curve;
|
||
|
|
#endif
|
||
|
|
|
||
|
|
spx_word16_t gamma1; /**< Perceptual filter: A(z/gamma1) */
|
||
|
|
spx_word16_t gamma2; /**< Perceptual filter: A(z/gamma2) */
|
||
|
|
spx_word16_t lpc_floor; /**< Noise floor multiplier for A[0] in LPC analysis*/
|
||
|
|
char *stack; /**< Pseudo-stack allocation for temporary memory */
|
||
|
|
spx_word16_t *winBuf; /**< Input buffer (original signal) */
|
||
|
|
spx_word16_t *excBuf; /**< Excitation buffer */
|
||
|
|
spx_word16_t *exc; /**< Start of excitation frame */
|
||
|
|
spx_word16_t *swBuf; /**< Weighted signal buffer */
|
||
|
|
spx_word16_t *sw; /**< Start of weighted signal frame */
|
||
|
|
const spx_word16_t *window; /**< Temporary (Hanning) window */
|
||
|
|
const spx_word16_t *lagWindow; /**< Window applied to auto-correlation */
|
||
|
|
spx_lsp_t *old_lsp; /**< LSPs for previous frame */
|
||
|
|
spx_lsp_t *old_qlsp; /**< Quantized LSPs for previous frame */
|
||
|
|
spx_mem_t *mem_sp; /**< Filter memory for signal synthesis */
|
||
|
|
spx_mem_t *mem_sw; /**< Filter memory for perceptually-weighted signal */
|
||
|
|
spx_mem_t *mem_sw_whole; /**< Filter memory for perceptually-weighted signal (whole frame)*/
|
||
|
|
spx_mem_t *mem_exc; /**< Filter memory for excitation (whole frame) */
|
||
|
|
spx_mem_t *mem_exc2; /**< Filter memory for excitation (whole frame) */
|
||
|
|
spx_mem_t mem_hp[2]; /**< High-pass filter memory */
|
||
|
|
spx_word32_t *pi_gain; /**< Gain of LPC filter at theta=pi (fe/2) */
|
||
|
|
spx_word16_t *innov_rms_save; /**< If non-NULL, innovation RMS is copied here */
|
||
|
|
|
||
|
|
#ifndef DISABLE_VBR
|
||
|
|
VBRState *vbr; /**< State of the VBR data */
|
||
|
|
float vbr_quality; /**< Quality setting for VBR encoding */
|
||
|
|
float relative_quality; /**< Relative quality that will be needed by VBR */
|
||
|
|
spx_int32_t vbr_enabled; /**< 1 for enabling VBR, 0 otherwise */
|
||
|
|
spx_int32_t vbr_max; /**< Max bit-rate allowed in VBR mode */
|
||
|
|
int vad_enabled; /**< 1 for enabling VAD, 0 otherwise */
|
||
|
|
int dtx_enabled; /**< 1 for enabling DTX, 0 otherwise */
|
||
|
|
int dtx_count; /**< Number of consecutive DTX frames */
|
||
|
|
spx_int32_t abr_enabled; /**< ABR setting (in bps), 0 if off */
|
||
|
|
float abr_drift;
|
||
|
|
float abr_drift2;
|
||
|
|
float abr_count;
|
||
|
|
#endif /* #ifndef DISABLE_VBR */
|
||
|
|
|
||
|
|
int complexity; /**< Complexity setting (0-10 from least complex to most complex) */
|
||
|
|
spx_int32_t sampling_rate;
|
||
|
|
int plc_tuning;
|
||
|
|
int encode_submode;
|
||
|
|
const SpeexSubmode * const *submodes; /**< Sub-mode data */
|
||
|
|
int submodeID; /**< Activated sub-mode */
|
||
|
|
int submodeSelect; /**< Mode chosen by the user (may differ from submodeID if VAD is on) */
|
||
|
|
int isWideband; /**< Is this used as part of the embedded wideband codec */
|
||
|
|
int highpass_enabled; /**< Is the input filter enabled */
|
||
|
|
} EncState;
|
||
|
|
|
||
|
|
/**Structure representing the full state of the narrowband decoder*/
|
||
|
|
typedef struct DecState {
|
||
|
|
const SpeexMode *mode; /**< Mode corresponding to the state */
|
||
|
|
int first; /**< Is this the first frame? */
|
||
|
|
int count_lost; /**< Was the last frame lost? */
|
||
|
|
int frameSize; /**< Size of frames */
|
||
|
|
int subframeSize; /**< Size of sub-frames */
|
||
|
|
int nbSubframes; /**< Number of sub-frames */
|
||
|
|
int lpcSize; /**< LPC order */
|
||
|
|
int min_pitch; /**< Minimum pitch value allowed */
|
||
|
|
int max_pitch; /**< Maximum pitch value allowed */
|
||
|
|
spx_int32_t sampling_rate;
|
||
|
|
|
||
|
|
spx_word16_t last_ol_gain; /**< Open-loop gain for previous frame */
|
||
|
|
|
||
|
|
char *stack; /**< Pseudo-stack allocation for temporary memory */
|
||
|
|
spx_word16_t *excBuf; /**< Excitation buffer */
|
||
|
|
spx_word16_t *exc; /**< Start of excitation frame */
|
||
|
|
spx_lsp_t *old_qlsp; /**< Quantized LSPs for previous frame */
|
||
|
|
spx_coef_t *interp_qlpc; /**< Interpolated quantized LPCs */
|
||
|
|
spx_mem_t *mem_sp; /**< Filter memory for synthesis signal */
|
||
|
|
spx_mem_t mem_hp[2]; /**< High-pass filter memory */
|
||
|
|
spx_word32_t *pi_gain; /**< Gain of LPC filter at theta=pi (fe/2) */
|
||
|
|
spx_word16_t *innov_save; /** If non-NULL, innovation is copied here */
|
||
|
|
|
||
|
|
spx_word16_t level;
|
||
|
|
spx_word16_t max_level;
|
||
|
|
spx_word16_t min_level;
|
||
|
|
|
||
|
|
/* This is used in packet loss concealment */
|
||
|
|
int last_pitch; /**< Pitch of last correctly decoded frame */
|
||
|
|
spx_word16_t last_pitch_gain; /**< Pitch gain of last correctly decoded frame */
|
||
|
|
spx_word16_t pitch_gain_buf[3]; /**< Pitch gain of last decoded frames */
|
||
|
|
int pitch_gain_buf_idx; /**< Tail of the buffer */
|
||
|
|
spx_int32_t seed; /** Seed used for random number generation */
|
||
|
|
|
||
|
|
int encode_submode;
|
||
|
|
const SpeexSubmode * const *submodes; /**< Sub-mode data */
|
||
|
|
int submodeID; /**< Activated sub-mode */
|
||
|
|
int lpc_enh_enabled; /**< 1 when LPC enhancer is on, 0 otherwise */
|
||
|
|
SpeexCallback speex_callbacks[SPEEX_MAX_CALLBACKS];
|
||
|
|
|
||
|
|
SpeexCallback user_callback;
|
||
|
|
|
||
|
|
/*Vocoder data*/
|
||
|
|
spx_word16_t voc_m1;
|
||
|
|
spx_word32_t voc_m2;
|
||
|
|
spx_word16_t voc_mean;
|
||
|
|
int voc_offset;
|
||
|
|
|
||
|
|
int dtx_enabled;
|
||
|
|
int isWideband; /**< Is this used as part of the embedded wideband codec */
|
||
|
|
int highpass_enabled; /**< Is the input filter enabled */
|
||
|
|
} DecState;
|
||
|
|
|
||
|
|
/** Initializes encoder state*/
|
||
|
|
void *nb_encoder_init(const SpeexMode *m);
|
||
|
|
|
||
|
|
/** De-allocates encoder state resources*/
|
||
|
|
void nb_encoder_destroy(void *state);
|
||
|
|
|
||
|
|
/** Encodes one frame*/
|
||
|
|
int nb_encode(void *state, void *in, SpeexBits *bits);
|
||
|
|
|
||
|
|
|
||
|
|
/** Initializes decoder state*/
|
||
|
|
void *nb_decoder_init(const SpeexMode *m);
|
||
|
|
|
||
|
|
/** De-allocates decoder state resources*/
|
||
|
|
void nb_decoder_destroy(void *state);
|
||
|
|
|
||
|
|
/** Decodes one frame*/
|
||
|
|
int nb_decode(void *state, SpeexBits *bits, void *out);
|
||
|
|
|
||
|
|
/** ioctl-like function for controlling a narrowband encoder */
|
||
|
|
int nb_encoder_ctl(void *state, int request, void *ptr);
|
||
|
|
|
||
|
|
/** ioctl-like function for controlling a narrowband decoder */
|
||
|
|
int nb_decoder_ctl(void *state, int request, void *ptr);
|
||
|
|
|
||
|
|
|
||
|
|
#endif
|