mirror of
https://git.ffmpeg.org/ffmpeg.git
synced 2024-12-27 01:42:20 +00:00
268 lines
6.9 KiB
C
268 lines
6.9 KiB
C
/*
|
|
* G.723.1 common header and data tables
|
|
* Copyright (c) 2006 Benjamin Larsson
|
|
* Copyright (c) 2010 Mohamed Naufal Basheer
|
|
*
|
|
* This file is part of FFmpeg.
|
|
*
|
|
* FFmpeg 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.
|
|
*
|
|
* FFmpeg 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 FFmpeg; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
/**
|
|
* @file
|
|
* G.723.1 types, functions and data tables
|
|
*/
|
|
|
|
#ifndef AVCODEC_G723_1_H
|
|
#define AVCODEC_G723_1_H
|
|
|
|
#include <stdint.h>
|
|
|
|
#include "libavutil/log.h"
|
|
|
|
#define SUBFRAMES 4
|
|
#define SUBFRAME_LEN 60
|
|
#define FRAME_LEN (SUBFRAME_LEN << 2)
|
|
#define HALF_FRAME_LEN (FRAME_LEN / 2)
|
|
#define LPC_FRAME (HALF_FRAME_LEN + SUBFRAME_LEN)
|
|
#define LPC_ORDER 10
|
|
#define LSP_BANDS 3
|
|
#define LSP_CB_SIZE 256
|
|
#define PITCH_MIN 18
|
|
#define PITCH_MAX (PITCH_MIN + 127)
|
|
#define PITCH_ORDER 5
|
|
#define GRID_SIZE 2
|
|
#define PULSE_MAX 6
|
|
#define GAIN_LEVELS 24
|
|
#define COS_TBL_SIZE 512
|
|
|
|
/**
|
|
* Bitexact implementation of 2ab scaled by 1/2^16.
|
|
*
|
|
* @param a 32 bit multiplicand
|
|
* @param b 16 bit multiplier
|
|
*/
|
|
#define MULL2(a, b) \
|
|
((((a) >> 16) * (b) * 2) + (((a) & 0xffff) * (b) >> 15))
|
|
|
|
/**
|
|
* G723.1 frame types
|
|
*/
|
|
enum FrameType {
|
|
ACTIVE_FRAME, ///< Active speech
|
|
SID_FRAME, ///< Silence Insertion Descriptor frame
|
|
UNTRANSMITTED_FRAME
|
|
};
|
|
|
|
/**
|
|
* G723.1 rate values
|
|
*/
|
|
enum Rate {
|
|
RATE_6300,
|
|
RATE_5300
|
|
};
|
|
|
|
/**
|
|
* G723.1 unpacked data subframe
|
|
*/
|
|
typedef struct G723_1_Subframe {
|
|
int ad_cb_lag; ///< adaptive codebook lag
|
|
int ad_cb_gain;
|
|
int dirac_train;
|
|
int pulse_sign;
|
|
int grid_index;
|
|
int amp_index;
|
|
int pulse_pos;
|
|
} G723_1_Subframe;
|
|
|
|
/**
|
|
* Pitch postfilter parameters
|
|
*/
|
|
typedef struct PPFParam {
|
|
int index; ///< postfilter backward/forward lag
|
|
int16_t opt_gain; ///< optimal gain
|
|
int16_t sc_gain; ///< scaling gain
|
|
} PPFParam;
|
|
|
|
/**
|
|
* Harmonic filter parameters
|
|
*/
|
|
typedef struct HFParam {
|
|
int index;
|
|
int gain;
|
|
} HFParam;
|
|
|
|
/**
|
|
* Optimized fixed codebook excitation parameters
|
|
*/
|
|
typedef struct FCBParam {
|
|
int min_err;
|
|
int amp_index;
|
|
int grid_index;
|
|
int dirac_train;
|
|
int pulse_pos[PULSE_MAX];
|
|
int pulse_sign[PULSE_MAX];
|
|
} FCBParam;
|
|
|
|
typedef struct G723_1_ChannelContext {
|
|
G723_1_Subframe subframe[4];
|
|
enum FrameType cur_frame_type;
|
|
enum FrameType past_frame_type;
|
|
enum Rate cur_rate;
|
|
uint8_t lsp_index[LSP_BANDS];
|
|
int pitch_lag[2];
|
|
int erased_frames;
|
|
|
|
int16_t prev_lsp[LPC_ORDER];
|
|
int16_t sid_lsp[LPC_ORDER];
|
|
int16_t prev_excitation[PITCH_MAX];
|
|
int16_t excitation[PITCH_MAX + FRAME_LEN + 4];
|
|
int16_t synth_mem[LPC_ORDER];
|
|
int16_t fir_mem[LPC_ORDER];
|
|
int iir_mem[LPC_ORDER];
|
|
|
|
int random_seed;
|
|
int cng_random_seed;
|
|
int interp_index;
|
|
int interp_gain;
|
|
int sid_gain;
|
|
int cur_gain;
|
|
int reflection_coef;
|
|
int pf_gain; ///< formant postfilter
|
|
///< gain scaling unit memory
|
|
int16_t audio[FRAME_LEN + LPC_ORDER + PITCH_MAX + 4];
|
|
|
|
/* encoder */
|
|
int16_t prev_data[HALF_FRAME_LEN];
|
|
int16_t prev_weight_sig[PITCH_MAX];
|
|
|
|
int16_t hpf_fir_mem; ///< highpass filter fir
|
|
int hpf_iir_mem; ///< and iir memories
|
|
int16_t perf_fir_mem[LPC_ORDER]; ///< perceptual filter fir
|
|
int16_t perf_iir_mem[LPC_ORDER]; ///< and iir memories
|
|
|
|
int16_t harmonic_mem[PITCH_MAX];
|
|
} G723_1_ChannelContext;
|
|
|
|
typedef struct G723_1_Context {
|
|
AVClass *class;
|
|
int postfilter;
|
|
|
|
G723_1_ChannelContext ch[2];
|
|
} G723_1_Context;
|
|
|
|
|
|
/**
|
|
* Scale vector contents based on the largest of their absolutes.
|
|
*/
|
|
int ff_g723_1_scale_vector(int16_t *dst, const int16_t *vector, int length);
|
|
|
|
/**
|
|
* Calculate the number of left-shifts required for normalizing the input.
|
|
*
|
|
* @param num input number
|
|
* @param width width of the input, 16 bits(0) / 32 bits(1)
|
|
*/
|
|
int ff_g723_1_normalize_bits(int num, int width);
|
|
|
|
int ff_g723_1_dot_product(const int16_t *a, const int16_t *b, int length);
|
|
|
|
/**
|
|
* Get delayed contribution from the previous excitation vector.
|
|
*/
|
|
void ff_g723_1_get_residual(int16_t *residual, int16_t *prev_excitation,
|
|
int lag);
|
|
|
|
/**
|
|
* Generate a train of dirac functions with period as pitch lag.
|
|
*/
|
|
void ff_g723_1_gen_dirac_train(int16_t *buf, int pitch_lag);
|
|
|
|
|
|
/**
|
|
* Generate adaptive codebook excitation.
|
|
*/
|
|
void ff_g723_1_gen_acb_excitation(int16_t *vector, int16_t *prev_excitation,
|
|
int pitch_lag, G723_1_Subframe *subfrm,
|
|
enum Rate cur_rate);
|
|
/**
|
|
* Quantize LSP frequencies by interpolation and convert them to
|
|
* the corresponding LPC coefficients.
|
|
*
|
|
* @param lpc buffer for LPC coefficients
|
|
* @param cur_lsp the current LSP vector
|
|
* @param prev_lsp the previous LSP vector
|
|
*/
|
|
void ff_g723_1_lsp_interpolate(int16_t *lpc, int16_t *cur_lsp,
|
|
int16_t *prev_lsp);
|
|
|
|
/**
|
|
* Perform inverse quantization of LSP frequencies.
|
|
*
|
|
* @param cur_lsp the current LSP vector
|
|
* @param prev_lsp the previous LSP vector
|
|
* @param lsp_index VQ indices
|
|
* @param bad_frame bad frame flag
|
|
*/
|
|
void ff_g723_1_inverse_quant(int16_t *cur_lsp, int16_t *prev_lsp,
|
|
uint8_t *lsp_index, int bad_frame);
|
|
|
|
static const uint8_t frame_size[4] = { 24, 20, 4, 1 };
|
|
|
|
/**
|
|
* LSP DC component
|
|
*/
|
|
static const int16_t dc_lsp[LPC_ORDER] = {
|
|
0x0c3b,
|
|
0x1271,
|
|
0x1e0a,
|
|
0x2a36,
|
|
0x3630,
|
|
0x406f,
|
|
0x4d28,
|
|
0x56f4,
|
|
0x638c,
|
|
0x6c46
|
|
};
|
|
|
|
/* Cosine table scaled by 2^14 */
|
|
extern const int16_t ff_g723_1_cos_tab[COS_TBL_SIZE + 1];
|
|
#define G723_1_COS_TAB_FIRST_ELEMENT 16384
|
|
|
|
/**
|
|
* LSP VQ tables
|
|
*/
|
|
extern const int16_t ff_g723_1_lsp_band0[LSP_CB_SIZE][3];
|
|
extern const int16_t ff_g723_1_lsp_band1[LSP_CB_SIZE][3];
|
|
extern const int16_t ff_g723_1_lsp_band2[LSP_CB_SIZE][4];
|
|
|
|
/**
|
|
* Used for the coding/decoding of the pulses positions
|
|
* for the MP-MLQ codebook
|
|
*/
|
|
extern const int32_t ff_g723_1_combinatorial_table[PULSE_MAX][SUBFRAME_LEN/GRID_SIZE];
|
|
|
|
/**
|
|
* Number of non-zero pulses in the MP-MLQ excitation
|
|
*/
|
|
static const int8_t pulses[4] = {6, 5, 6, 5};
|
|
|
|
extern const int16_t ff_g723_1_fixed_cb_gain[GAIN_LEVELS];
|
|
|
|
extern const int16_t ff_g723_1_adaptive_cb_gain85 [ 85 * 20];
|
|
extern const int16_t ff_g723_1_adaptive_cb_gain170[170 * 20];
|
|
|
|
#endif /* AVCODEC_G723_1_H */
|