mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-11-21 10:55:51 +02:00
107 lines
3.0 KiB
C
107 lines
3.0 KiB
C
/*
|
|
* SIPR / ACELP.NET decoder
|
|
*
|
|
* Copyright (c) 2008 Vladimir Voroshilov
|
|
* Copyright (c) 2009 Vitor Sessak
|
|
*
|
|
* This file is part of Libav.
|
|
*
|
|
* Libav is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2.1 of the License, or (at your option) any later version.
|
|
*
|
|
* Libav is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with Libav; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
#ifndef AVCODEC_SIPR_H
|
|
#define AVCODEC_SIPR_H
|
|
|
|
#include "avcodec.h"
|
|
#include "dsputil.h"
|
|
#include "acelp_pitch_delay.h"
|
|
|
|
#define LP_FILTER_ORDER_16k 16
|
|
#define L_SUBFR_16k 80
|
|
#define PITCH_MIN 30
|
|
#define PITCH_MAX 281
|
|
|
|
#define LSFQ_DIFF_MIN (0.0125 * M_PI)
|
|
|
|
#define LP_FILTER_ORDER 10
|
|
|
|
/** Number of past samples needed for excitation interpolation */
|
|
#define L_INTERPOL (LP_FILTER_ORDER + 1)
|
|
|
|
/** Subframe size for all modes except 16k */
|
|
#define SUBFR_SIZE 48
|
|
|
|
#define SUBFRAME_COUNT_16k 2
|
|
|
|
typedef enum {
|
|
MODE_16k,
|
|
MODE_8k5,
|
|
MODE_6k5,
|
|
MODE_5k0,
|
|
MODE_COUNT
|
|
} SiprMode;
|
|
|
|
typedef struct {
|
|
AVCodecContext *avctx;
|
|
|
|
SiprMode mode;
|
|
|
|
float past_pitch_gain;
|
|
float lsf_history[LP_FILTER_ORDER_16k];
|
|
|
|
float excitation[L_INTERPOL + PITCH_MAX + 2 * L_SUBFR_16k];
|
|
|
|
DECLARE_ALIGNED(16, float, synth_buf)[LP_FILTER_ORDER + 5*SUBFR_SIZE + 6];
|
|
|
|
float lsp_history[LP_FILTER_ORDER];
|
|
float gain_mem;
|
|
float energy_history[4];
|
|
float highpass_filt_mem[2];
|
|
float postfilter_mem[PITCH_DELAY_MAX + LP_FILTER_ORDER];
|
|
|
|
/* 5k0 */
|
|
float tilt_mem;
|
|
float postfilter_agc;
|
|
float postfilter_mem5k0[PITCH_DELAY_MAX + LP_FILTER_ORDER];
|
|
float postfilter_syn5k0[LP_FILTER_ORDER + SUBFR_SIZE*5];
|
|
|
|
/* 16k */
|
|
int pitch_lag_prev;
|
|
float iir_mem[LP_FILTER_ORDER_16k+1];
|
|
float filt_buf[2][LP_FILTER_ORDER_16k+1];
|
|
float *filt_mem[2];
|
|
float mem_preemph[LP_FILTER_ORDER_16k];
|
|
float synth[LP_FILTER_ORDER_16k];
|
|
double lsp_history_16k[16];
|
|
} SiprContext;
|
|
|
|
typedef struct {
|
|
int ma_pred_switch; ///< switched moving average predictor
|
|
int vq_indexes[5];
|
|
int pitch_delay[5]; ///< pitch delay
|
|
int gp_index[5]; ///< adaptive-codebook gain indexes
|
|
int16_t fc_indexes[5][10]; ///< fixed-codebook indexes
|
|
int gc_index[5]; ///< fixed-codebook gain indexes
|
|
} SiprParameters;
|
|
|
|
extern const float ff_pow_0_5[16];
|
|
|
|
void ff_sipr_init_16k(SiprContext *ctx);
|
|
|
|
void ff_sipr_decode_frame_16k(SiprContext *ctx, SiprParameters *params,
|
|
float *out_data);
|
|
|
|
#endif /* AVCODEC_SIPR_H */
|