mirror of
https://github.com/pineappleEA/pineapple-src.git
synced 2024-12-05 07:18:27 -05:00
776 lines
28 KiB
C
Executable File
776 lines
28 KiB
C
Executable File
/*
|
|
* G.729, G729 Annex D decoders
|
|
* Copyright (c) 2008 Vladimir Voroshilov
|
|
*
|
|
* 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
|
|
*/
|
|
|
|
#include <inttypes.h>
|
|
#include <string.h>
|
|
|
|
#include "avcodec.h"
|
|
#include "libavutil/avutil.h"
|
|
#include "get_bits.h"
|
|
#include "audiodsp.h"
|
|
#include "internal.h"
|
|
|
|
|
|
#include "g729.h"
|
|
#include "lsp.h"
|
|
#include "celp_math.h"
|
|
#include "celp_filters.h"
|
|
#include "acelp_filters.h"
|
|
#include "acelp_pitch_delay.h"
|
|
#include "acelp_vectors.h"
|
|
#include "g729data.h"
|
|
#include "g729postfilter.h"
|
|
|
|
/**
|
|
* minimum quantized LSF value (3.2.4)
|
|
* 0.005 in Q13
|
|
*/
|
|
#define LSFQ_MIN 40
|
|
|
|
/**
|
|
* maximum quantized LSF value (3.2.4)
|
|
* 3.135 in Q13
|
|
*/
|
|
#define LSFQ_MAX 25681
|
|
|
|
/**
|
|
* minimum LSF distance (3.2.4)
|
|
* 0.0391 in Q13
|
|
*/
|
|
#define LSFQ_DIFF_MIN 321
|
|
|
|
/// interpolation filter length
|
|
#define INTERPOL_LEN 11
|
|
|
|
/**
|
|
* minimum gain pitch value (3.8, Equation 47)
|
|
* 0.2 in (1.14)
|
|
*/
|
|
#define SHARP_MIN 3277
|
|
|
|
/**
|
|
* maximum gain pitch value (3.8, Equation 47)
|
|
* (EE) This does not comply with the specification.
|
|
* Specification says about 0.8, which should be
|
|
* 13107 in (1.14), but reference C code uses
|
|
* 13017 (equals to 0.7945) instead of it.
|
|
*/
|
|
#define SHARP_MAX 13017
|
|
|
|
/**
|
|
* MR_ENERGY (mean removed energy) = mean_energy + 10 * log10(2^26 * subframe_size) in (7.13)
|
|
*/
|
|
#define MR_ENERGY 1018156
|
|
|
|
#define DECISION_NOISE 0
|
|
#define DECISION_INTERMEDIATE 1
|
|
#define DECISION_VOICE 2
|
|
|
|
typedef enum {
|
|
FORMAT_G729_8K = 0,
|
|
FORMAT_G729D_6K4,
|
|
FORMAT_COUNT,
|
|
} G729Formats;
|
|
|
|
typedef struct {
|
|
uint8_t ac_index_bits[2]; ///< adaptive codebook index for second subframe (size in bits)
|
|
uint8_t parity_bit; ///< parity bit for pitch delay
|
|
uint8_t gc_1st_index_bits; ///< gain codebook (first stage) index (size in bits)
|
|
uint8_t gc_2nd_index_bits; ///< gain codebook (second stage) index (size in bits)
|
|
uint8_t fc_signs_bits; ///< number of pulses in fixed-codebook vector
|
|
uint8_t fc_indexes_bits; ///< size (in bits) of fixed-codebook index entry
|
|
uint8_t block_size;
|
|
} G729FormatDescription;
|
|
|
|
typedef struct {
|
|
/// past excitation signal buffer
|
|
int16_t exc_base[2*SUBFRAME_SIZE+PITCH_DELAY_MAX+INTERPOL_LEN];
|
|
|
|
int16_t* exc; ///< start of past excitation data in buffer
|
|
int pitch_delay_int_prev; ///< integer part of previous subframe's pitch delay (4.1.3)
|
|
|
|
/// (2.13) LSP quantizer outputs
|
|
int16_t past_quantizer_output_buf[MA_NP + 1][10];
|
|
int16_t* past_quantizer_outputs[MA_NP + 1];
|
|
|
|
int16_t lsfq[10]; ///< (2.13) quantized LSF coefficients from previous frame
|
|
int16_t lsp_buf[2][10]; ///< (0.15) LSP coefficients (previous and current frames) (3.2.5)
|
|
int16_t *lsp[2]; ///< pointers to lsp_buf
|
|
|
|
int16_t quant_energy[4]; ///< (5.10) past quantized energy
|
|
|
|
/// previous speech data for LP synthesis filter
|
|
int16_t syn_filter_data[10];
|
|
|
|
|
|
/// residual signal buffer (used in long-term postfilter)
|
|
int16_t residual[SUBFRAME_SIZE + RES_PREV_DATA_SIZE];
|
|
|
|
/// previous speech data for residual calculation filter
|
|
int16_t res_filter_data[SUBFRAME_SIZE+10];
|
|
|
|
/// previous speech data for short-term postfilter
|
|
int16_t pos_filter_data[SUBFRAME_SIZE+10];
|
|
|
|
/// (1.14) pitch gain of current and five previous subframes
|
|
int16_t past_gain_pitch[6];
|
|
|
|
/// (14.1) gain code from current and previous subframe
|
|
int16_t past_gain_code[2];
|
|
|
|
/// voice decision on previous subframe (0-noise, 1-intermediate, 2-voice), G.729D
|
|
int16_t voice_decision;
|
|
|
|
int16_t onset; ///< detected onset level (0-2)
|
|
int16_t was_periodic; ///< whether previous frame was declared as periodic or not (4.4)
|
|
int16_t ht_prev_data; ///< previous data for 4.2.3, equation 86
|
|
int gain_coeff; ///< (1.14) gain coefficient (4.2.4)
|
|
uint16_t rand_value; ///< random number generator value (4.4.4)
|
|
int ma_predictor_prev; ///< switched MA predictor of LSP quantizer from last good frame
|
|
|
|
/// (14.14) high-pass filter data (past input)
|
|
int hpf_f[2];
|
|
|
|
/// high-pass filter data (past output)
|
|
int16_t hpf_z[2];
|
|
} G729ChannelContext;
|
|
|
|
typedef struct {
|
|
AudioDSPContext adsp;
|
|
|
|
G729ChannelContext *channel_context;
|
|
} G729Context;
|
|
|
|
static const G729FormatDescription format_g729_8k = {
|
|
.ac_index_bits = {8,5},
|
|
.parity_bit = 1,
|
|
.gc_1st_index_bits = GC_1ST_IDX_BITS_8K,
|
|
.gc_2nd_index_bits = GC_2ND_IDX_BITS_8K,
|
|
.fc_signs_bits = 4,
|
|
.fc_indexes_bits = 13,
|
|
.block_size = G729_8K_BLOCK_SIZE,
|
|
};
|
|
|
|
static const G729FormatDescription format_g729d_6k4 = {
|
|
.ac_index_bits = {8,4},
|
|
.parity_bit = 0,
|
|
.gc_1st_index_bits = GC_1ST_IDX_BITS_6K4,
|
|
.gc_2nd_index_bits = GC_2ND_IDX_BITS_6K4,
|
|
.fc_signs_bits = 2,
|
|
.fc_indexes_bits = 9,
|
|
.block_size = G729D_6K4_BLOCK_SIZE,
|
|
};
|
|
|
|
/**
|
|
* @brief pseudo random number generator
|
|
*/
|
|
static inline uint16_t g729_prng(uint16_t value)
|
|
{
|
|
return 31821 * value + 13849;
|
|
}
|
|
|
|
/**
|
|
* Decodes LSF (Line Spectral Frequencies) from L0-L3 (3.2.4).
|
|
* @param[out] lsfq (2.13) quantized LSF coefficients
|
|
* @param[in,out] past_quantizer_outputs (2.13) quantizer outputs from previous frames
|
|
* @param ma_predictor switched MA predictor of LSP quantizer
|
|
* @param vq_1st first stage vector of quantizer
|
|
* @param vq_2nd_low second stage lower vector of LSP quantizer
|
|
* @param vq_2nd_high second stage higher vector of LSP quantizer
|
|
*/
|
|
static void lsf_decode(int16_t* lsfq, int16_t* past_quantizer_outputs[MA_NP + 1],
|
|
int16_t ma_predictor,
|
|
int16_t vq_1st, int16_t vq_2nd_low, int16_t vq_2nd_high)
|
|
{
|
|
int i,j;
|
|
static const uint8_t min_distance[2]={10, 5}; //(2.13)
|
|
int16_t* quantizer_output = past_quantizer_outputs[MA_NP];
|
|
|
|
for (i = 0; i < 5; i++) {
|
|
quantizer_output[i] = cb_lsp_1st[vq_1st][i ] + cb_lsp_2nd[vq_2nd_low ][i ];
|
|
quantizer_output[i + 5] = cb_lsp_1st[vq_1st][i + 5] + cb_lsp_2nd[vq_2nd_high][i + 5];
|
|
}
|
|
|
|
for (j = 0; j < 2; j++) {
|
|
for (i = 1; i < 10; i++) {
|
|
int diff = (quantizer_output[i - 1] - quantizer_output[i] + min_distance[j]) >> 1;
|
|
if (diff > 0) {
|
|
quantizer_output[i - 1] -= diff;
|
|
quantizer_output[i ] += diff;
|
|
}
|
|
}
|
|
}
|
|
|
|
for (i = 0; i < 10; i++) {
|
|
int sum = quantizer_output[i] * cb_ma_predictor_sum[ma_predictor][i];
|
|
for (j = 0; j < MA_NP; j++)
|
|
sum += past_quantizer_outputs[j][i] * cb_ma_predictor[ma_predictor][j][i];
|
|
|
|
lsfq[i] = sum >> 15;
|
|
}
|
|
|
|
ff_acelp_reorder_lsf(lsfq, LSFQ_DIFF_MIN, LSFQ_MIN, LSFQ_MAX, 10);
|
|
}
|
|
|
|
/**
|
|
* Restores past LSP quantizer output using LSF from previous frame
|
|
* @param[in,out] lsfq (2.13) quantized LSF coefficients
|
|
* @param[in,out] past_quantizer_outputs (2.13) quantizer outputs from previous frames
|
|
* @param ma_predictor_prev MA predictor from previous frame
|
|
* @param lsfq_prev (2.13) quantized LSF coefficients from previous frame
|
|
*/
|
|
static void lsf_restore_from_previous(int16_t* lsfq,
|
|
int16_t* past_quantizer_outputs[MA_NP + 1],
|
|
int ma_predictor_prev)
|
|
{
|
|
int16_t* quantizer_output = past_quantizer_outputs[MA_NP];
|
|
int i,k;
|
|
|
|
for (i = 0; i < 10; i++) {
|
|
int tmp = lsfq[i] << 15;
|
|
|
|
for (k = 0; k < MA_NP; k++)
|
|
tmp -= past_quantizer_outputs[k][i] * cb_ma_predictor[ma_predictor_prev][k][i];
|
|
|
|
quantizer_output[i] = ((tmp >> 15) * cb_ma_predictor_sum_inv[ma_predictor_prev][i]) >> 12;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Constructs new excitation signal and applies phase filter to it
|
|
* @param[out] out constructed speech signal
|
|
* @param in original excitation signal
|
|
* @param fc_cur (2.13) original fixed-codebook vector
|
|
* @param gain_code (14.1) gain code
|
|
* @param subframe_size length of the subframe
|
|
*/
|
|
static void g729d_get_new_exc(
|
|
int16_t* out,
|
|
const int16_t* in,
|
|
const int16_t* fc_cur,
|
|
int dstate,
|
|
int gain_code,
|
|
int subframe_size)
|
|
{
|
|
int i;
|
|
int16_t fc_new[SUBFRAME_SIZE];
|
|
|
|
ff_celp_convolve_circ(fc_new, fc_cur, phase_filter[dstate], subframe_size);
|
|
|
|
for (i = 0; i < subframe_size; i++) {
|
|
out[i] = in[i];
|
|
out[i] -= (gain_code * fc_cur[i] + 0x2000) >> 14;
|
|
out[i] += (gain_code * fc_new[i] + 0x2000) >> 14;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Makes decision about onset in current subframe
|
|
* @param past_onset decision result of previous subframe
|
|
* @param past_gain_code gain code of current and previous subframe
|
|
*
|
|
* @return onset decision result for current subframe
|
|
*/
|
|
static int g729d_onset_decision(int past_onset, const int16_t* past_gain_code)
|
|
{
|
|
if ((past_gain_code[0] >> 1) > past_gain_code[1])
|
|
return 2;
|
|
|
|
return FFMAX(past_onset-1, 0);
|
|
}
|
|
|
|
/**
|
|
* Makes decision about voice presence in current subframe
|
|
* @param onset onset level
|
|
* @param prev_voice_decision voice decision result from previous subframe
|
|
* @param past_gain_pitch pitch gain of current and previous subframes
|
|
*
|
|
* @return voice decision result for current subframe
|
|
*/
|
|
static int16_t g729d_voice_decision(int onset, int prev_voice_decision, const int16_t* past_gain_pitch)
|
|
{
|
|
int i, low_gain_pitch_cnt, voice_decision;
|
|
|
|
if (past_gain_pitch[0] >= 14745) { // 0.9
|
|
voice_decision = DECISION_VOICE;
|
|
} else if (past_gain_pitch[0] <= 9830) { // 0.6
|
|
voice_decision = DECISION_NOISE;
|
|
} else {
|
|
voice_decision = DECISION_INTERMEDIATE;
|
|
}
|
|
|
|
for (i = 0, low_gain_pitch_cnt = 0; i < 6; i++)
|
|
if (past_gain_pitch[i] < 9830)
|
|
low_gain_pitch_cnt++;
|
|
|
|
if (low_gain_pitch_cnt > 2 && !onset)
|
|
voice_decision = DECISION_NOISE;
|
|
|
|
if (!onset && voice_decision > prev_voice_decision + 1)
|
|
voice_decision--;
|
|
|
|
if (onset && voice_decision < DECISION_VOICE)
|
|
voice_decision++;
|
|
|
|
return voice_decision;
|
|
}
|
|
|
|
static int32_t scalarproduct_int16_c(const int16_t * v1, const int16_t * v2, int order)
|
|
{
|
|
int64_t res = 0;
|
|
|
|
while (order--)
|
|
res += *v1++ * *v2++;
|
|
|
|
if (res > INT32_MAX) return INT32_MAX;
|
|
else if (res < INT32_MIN) return INT32_MIN;
|
|
|
|
return res;
|
|
}
|
|
|
|
static av_cold int decoder_init(AVCodecContext * avctx)
|
|
{
|
|
G729Context *s = avctx->priv_data;
|
|
G729ChannelContext *ctx;
|
|
int c,i,k;
|
|
|
|
if (avctx->channels < 1 || avctx->channels > 2) {
|
|
av_log(avctx, AV_LOG_ERROR, "Only mono and stereo are supported (requested channels: %d).\n", avctx->channels);
|
|
return AVERROR(EINVAL);
|
|
}
|
|
avctx->sample_fmt = AV_SAMPLE_FMT_S16P;
|
|
|
|
/* Both 8kbit/s and 6.4kbit/s modes uses two subframes per frame. */
|
|
avctx->frame_size = SUBFRAME_SIZE << 1;
|
|
|
|
ctx =
|
|
s->channel_context = av_mallocz(sizeof(G729ChannelContext) * avctx->channels);
|
|
if (!ctx)
|
|
return AVERROR(ENOMEM);
|
|
|
|
for (c = 0; c < avctx->channels; c++) {
|
|
ctx->gain_coeff = 16384; // 1.0 in (1.14)
|
|
|
|
for (k = 0; k < MA_NP + 1; k++) {
|
|
ctx->past_quantizer_outputs[k] = ctx->past_quantizer_output_buf[k];
|
|
for (i = 1; i < 11; i++)
|
|
ctx->past_quantizer_outputs[k][i - 1] = (18717 * i) >> 3;
|
|
}
|
|
|
|
ctx->lsp[0] = ctx->lsp_buf[0];
|
|
ctx->lsp[1] = ctx->lsp_buf[1];
|
|
memcpy(ctx->lsp[0], lsp_init, 10 * sizeof(int16_t));
|
|
|
|
ctx->exc = &ctx->exc_base[PITCH_DELAY_MAX+INTERPOL_LEN];
|
|
|
|
ctx->pitch_delay_int_prev = PITCH_DELAY_MIN;
|
|
|
|
/* random seed initialization */
|
|
ctx->rand_value = 21845;
|
|
|
|
/* quantized prediction error */
|
|
for (i = 0; i < 4; i++)
|
|
ctx->quant_energy[i] = -14336; // -14 in (5.10)
|
|
|
|
ctx++;
|
|
}
|
|
|
|
ff_audiodsp_init(&s->adsp);
|
|
s->adsp.scalarproduct_int16 = scalarproduct_int16_c;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame_ptr,
|
|
AVPacket *avpkt)
|
|
{
|
|
const uint8_t *buf = avpkt->data;
|
|
int buf_size = avpkt->size;
|
|
int16_t *out_frame;
|
|
GetBitContext gb;
|
|
const G729FormatDescription *format;
|
|
int c, i;
|
|
int16_t *tmp;
|
|
G729Formats packet_type;
|
|
G729Context *s = avctx->priv_data;
|
|
G729ChannelContext *ctx = s->channel_context;
|
|
int16_t lp[2][11]; // (3.12)
|
|
uint8_t ma_predictor; ///< switched MA predictor of LSP quantizer
|
|
uint8_t quantizer_1st; ///< first stage vector of quantizer
|
|
uint8_t quantizer_2nd_lo; ///< second stage lower vector of quantizer (size in bits)
|
|
uint8_t quantizer_2nd_hi; ///< second stage higher vector of quantizer (size in bits)
|
|
|
|
int pitch_delay_int[2]; // pitch delay, integer part
|
|
int pitch_delay_3x; // pitch delay, multiplied by 3
|
|
int16_t fc[SUBFRAME_SIZE]; // fixed-codebook vector
|
|
int16_t synth[SUBFRAME_SIZE+10]; // fixed-codebook vector
|
|
int j, ret;
|
|
int gain_before, gain_after;
|
|
AVFrame *frame = data;
|
|
|
|
frame->nb_samples = SUBFRAME_SIZE<<1;
|
|
if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
|
|
return ret;
|
|
|
|
if (buf_size && buf_size % ((G729_8K_BLOCK_SIZE + (avctx->codec_id == AV_CODEC_ID_ACELP_KELVIN)) * avctx->channels) == 0) {
|
|
packet_type = FORMAT_G729_8K;
|
|
format = &format_g729_8k;
|
|
//Reset voice decision
|
|
ctx->onset = 0;
|
|
ctx->voice_decision = DECISION_VOICE;
|
|
av_log(avctx, AV_LOG_DEBUG, "Packet type: %s\n", "G.729 @ 8kbit/s");
|
|
} else if (buf_size == G729D_6K4_BLOCK_SIZE * avctx->channels && avctx->codec_id != AV_CODEC_ID_ACELP_KELVIN) {
|
|
packet_type = FORMAT_G729D_6K4;
|
|
format = &format_g729d_6k4;
|
|
av_log(avctx, AV_LOG_DEBUG, "Packet type: %s\n", "G.729D @ 6.4kbit/s");
|
|
} else {
|
|
av_log(avctx, AV_LOG_ERROR, "Packet size %d is unknown.\n", buf_size);
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
|
|
for (c = 0; c < avctx->channels; c++) {
|
|
int frame_erasure = 0; ///< frame erasure detected during decoding
|
|
int bad_pitch = 0; ///< parity check failed
|
|
int is_periodic = 0; ///< whether one of the subframes is declared as periodic or not
|
|
out_frame = (int16_t*)frame->data[c];
|
|
if (avctx->codec_id == AV_CODEC_ID_ACELP_KELVIN) {
|
|
if (*buf != ((avctx->channels - 1 - c) * 0x80 | 2))
|
|
avpriv_request_sample(avctx, "First byte value %x for channel %d", *buf, c);
|
|
buf++;
|
|
}
|
|
|
|
for (i = 0; i < format->block_size; i++)
|
|
frame_erasure |= buf[i];
|
|
frame_erasure = !frame_erasure;
|
|
|
|
init_get_bits8(&gb, buf, format->block_size);
|
|
|
|
ma_predictor = get_bits(&gb, 1);
|
|
quantizer_1st = get_bits(&gb, VQ_1ST_BITS);
|
|
quantizer_2nd_lo = get_bits(&gb, VQ_2ND_BITS);
|
|
quantizer_2nd_hi = get_bits(&gb, VQ_2ND_BITS);
|
|
|
|
if (frame_erasure) {
|
|
lsf_restore_from_previous(ctx->lsfq, ctx->past_quantizer_outputs,
|
|
ctx->ma_predictor_prev);
|
|
} else {
|
|
lsf_decode(ctx->lsfq, ctx->past_quantizer_outputs,
|
|
ma_predictor,
|
|
quantizer_1st, quantizer_2nd_lo, quantizer_2nd_hi);
|
|
ctx->ma_predictor_prev = ma_predictor;
|
|
}
|
|
|
|
tmp = ctx->past_quantizer_outputs[MA_NP];
|
|
memmove(ctx->past_quantizer_outputs + 1, ctx->past_quantizer_outputs,
|
|
MA_NP * sizeof(int16_t*));
|
|
ctx->past_quantizer_outputs[0] = tmp;
|
|
|
|
ff_acelp_lsf2lsp(ctx->lsp[1], ctx->lsfq, 10);
|
|
|
|
ff_acelp_lp_decode(&lp[0][0], &lp[1][0], ctx->lsp[1], ctx->lsp[0], 10);
|
|
|
|
FFSWAP(int16_t*, ctx->lsp[1], ctx->lsp[0]);
|
|
|
|
for (i = 0; i < 2; i++) {
|
|
int gain_corr_factor;
|
|
|
|
uint8_t ac_index; ///< adaptive codebook index
|
|
uint8_t pulses_signs; ///< fixed-codebook vector pulse signs
|
|
int fc_indexes; ///< fixed-codebook indexes
|
|
uint8_t gc_1st_index; ///< gain codebook (first stage) index
|
|
uint8_t gc_2nd_index; ///< gain codebook (second stage) index
|
|
|
|
ac_index = get_bits(&gb, format->ac_index_bits[i]);
|
|
if (!i && format->parity_bit)
|
|
bad_pitch = av_parity(ac_index >> 2) == get_bits1(&gb);
|
|
fc_indexes = get_bits(&gb, format->fc_indexes_bits);
|
|
pulses_signs = get_bits(&gb, format->fc_signs_bits);
|
|
gc_1st_index = get_bits(&gb, format->gc_1st_index_bits);
|
|
gc_2nd_index = get_bits(&gb, format->gc_2nd_index_bits);
|
|
|
|
if (frame_erasure) {
|
|
pitch_delay_3x = 3 * ctx->pitch_delay_int_prev;
|
|
} else if (!i) {
|
|
if (bad_pitch) {
|
|
pitch_delay_3x = 3 * ctx->pitch_delay_int_prev;
|
|
} else {
|
|
pitch_delay_3x = ff_acelp_decode_8bit_to_1st_delay3(ac_index);
|
|
}
|
|
} else {
|
|
int pitch_delay_min = av_clip(ctx->pitch_delay_int_prev - 5,
|
|
PITCH_DELAY_MIN, PITCH_DELAY_MAX - 9);
|
|
|
|
if (packet_type == FORMAT_G729D_6K4) {
|
|
pitch_delay_3x = ff_acelp_decode_4bit_to_2nd_delay3(ac_index, pitch_delay_min);
|
|
} else {
|
|
pitch_delay_3x = ff_acelp_decode_5_6_bit_to_2nd_delay3(ac_index, pitch_delay_min);
|
|
}
|
|
}
|
|
|
|
/* Round pitch delay to nearest (used everywhere except ff_acelp_interpolate). */
|
|
pitch_delay_int[i] = (pitch_delay_3x + 1) / 3;
|
|
if (pitch_delay_int[i] > PITCH_DELAY_MAX) {
|
|
av_log(avctx, AV_LOG_WARNING, "pitch_delay_int %d is too large\n", pitch_delay_int[i]);
|
|
pitch_delay_int[i] = PITCH_DELAY_MAX;
|
|
}
|
|
|
|
if (frame_erasure) {
|
|
ctx->rand_value = g729_prng(ctx->rand_value);
|
|
fc_indexes = av_mod_uintp2(ctx->rand_value, format->fc_indexes_bits);
|
|
|
|
ctx->rand_value = g729_prng(ctx->rand_value);
|
|
pulses_signs = ctx->rand_value;
|
|
}
|
|
|
|
|
|
memset(fc, 0, sizeof(int16_t) * SUBFRAME_SIZE);
|
|
switch (packet_type) {
|
|
case FORMAT_G729_8K:
|
|
ff_acelp_fc_pulse_per_track(fc, ff_fc_4pulses_8bits_tracks_13,
|
|
ff_fc_4pulses_8bits_track_4,
|
|
fc_indexes, pulses_signs, 3, 3);
|
|
break;
|
|
case FORMAT_G729D_6K4:
|
|
ff_acelp_fc_pulse_per_track(fc, ff_fc_2pulses_9bits_track1_gray,
|
|
ff_fc_2pulses_9bits_track2_gray,
|
|
fc_indexes, pulses_signs, 1, 4);
|
|
break;
|
|
}
|
|
|
|
/*
|
|
This filter enhances harmonic components of the fixed-codebook vector to
|
|
improve the quality of the reconstructed speech.
|
|
|
|
/ fc_v[i], i < pitch_delay
|
|
fc_v[i] = <
|
|
\ fc_v[i] + gain_pitch * fc_v[i-pitch_delay], i >= pitch_delay
|
|
*/
|
|
if (SUBFRAME_SIZE > pitch_delay_int[i])
|
|
ff_acelp_weighted_vector_sum(fc + pitch_delay_int[i],
|
|
fc + pitch_delay_int[i],
|
|
fc, 1 << 14,
|
|
av_clip(ctx->past_gain_pitch[0], SHARP_MIN, SHARP_MAX),
|
|
0, 14,
|
|
SUBFRAME_SIZE - pitch_delay_int[i]);
|
|
|
|
memmove(ctx->past_gain_pitch+1, ctx->past_gain_pitch, 5 * sizeof(int16_t));
|
|
ctx->past_gain_code[1] = ctx->past_gain_code[0];
|
|
|
|
if (frame_erasure) {
|
|
ctx->past_gain_pitch[0] = (29491 * ctx->past_gain_pitch[0]) >> 15; // 0.90 (0.15)
|
|
ctx->past_gain_code[0] = ( 2007 * ctx->past_gain_code[0] ) >> 11; // 0.98 (0.11)
|
|
|
|
gain_corr_factor = 0;
|
|
} else {
|
|
if (packet_type == FORMAT_G729D_6K4) {
|
|
ctx->past_gain_pitch[0] = cb_gain_1st_6k4[gc_1st_index][0] +
|
|
cb_gain_2nd_6k4[gc_2nd_index][0];
|
|
gain_corr_factor = cb_gain_1st_6k4[gc_1st_index][1] +
|
|
cb_gain_2nd_6k4[gc_2nd_index][1];
|
|
|
|
/* Without check below overflow can occur in ff_acelp_update_past_gain.
|
|
It is not issue for G.729, because gain_corr_factor in it's case is always
|
|
greater than 1024, while in G.729D it can be even zero. */
|
|
gain_corr_factor = FFMAX(gain_corr_factor, 1024);
|
|
#ifndef G729_BITEXACT
|
|
gain_corr_factor >>= 1;
|
|
#endif
|
|
} else {
|
|
ctx->past_gain_pitch[0] = cb_gain_1st_8k[gc_1st_index][0] +
|
|
cb_gain_2nd_8k[gc_2nd_index][0];
|
|
gain_corr_factor = cb_gain_1st_8k[gc_1st_index][1] +
|
|
cb_gain_2nd_8k[gc_2nd_index][1];
|
|
}
|
|
|
|
/* Decode the fixed-codebook gain. */
|
|
ctx->past_gain_code[0] = ff_acelp_decode_gain_code(&s->adsp, gain_corr_factor,
|
|
fc, MR_ENERGY,
|
|
ctx->quant_energy,
|
|
ma_prediction_coeff,
|
|
SUBFRAME_SIZE, 4);
|
|
#ifdef G729_BITEXACT
|
|
/*
|
|
This correction required to get bit-exact result with
|
|
reference code, because gain_corr_factor in G.729D is
|
|
two times larger than in original G.729.
|
|
|
|
If bit-exact result is not issue then gain_corr_factor
|
|
can be simpler divided by 2 before call to g729_get_gain_code
|
|
instead of using correction below.
|
|
*/
|
|
if (packet_type == FORMAT_G729D_6K4) {
|
|
gain_corr_factor >>= 1;
|
|
ctx->past_gain_code[0] >>= 1;
|
|
}
|
|
#endif
|
|
}
|
|
ff_acelp_update_past_gain(ctx->quant_energy, gain_corr_factor, 2, frame_erasure);
|
|
|
|
/* Routine requires rounding to lowest. */
|
|
ff_acelp_interpolate(ctx->exc + i * SUBFRAME_SIZE,
|
|
ctx->exc + i * SUBFRAME_SIZE - pitch_delay_3x / 3,
|
|
ff_acelp_interp_filter, 6,
|
|
(pitch_delay_3x % 3) << 1,
|
|
10, SUBFRAME_SIZE);
|
|
|
|
ff_acelp_weighted_vector_sum(ctx->exc + i * SUBFRAME_SIZE,
|
|
ctx->exc + i * SUBFRAME_SIZE, fc,
|
|
(!ctx->was_periodic && frame_erasure) ? 0 : ctx->past_gain_pitch[0],
|
|
( ctx->was_periodic && frame_erasure) ? 0 : ctx->past_gain_code[0],
|
|
1 << 13, 14, SUBFRAME_SIZE);
|
|
|
|
memcpy(synth, ctx->syn_filter_data, 10 * sizeof(int16_t));
|
|
|
|
if (ff_celp_lp_synthesis_filter(
|
|
synth+10,
|
|
&lp[i][1],
|
|
ctx->exc + i * SUBFRAME_SIZE,
|
|
SUBFRAME_SIZE,
|
|
10,
|
|
1,
|
|
0,
|
|
0x800))
|
|
/* Overflow occurred, downscale excitation signal... */
|
|
for (j = 0; j < 2 * SUBFRAME_SIZE + PITCH_DELAY_MAX + INTERPOL_LEN; j++)
|
|
ctx->exc_base[j] >>= 2;
|
|
|
|
/* ... and make synthesis again. */
|
|
if (packet_type == FORMAT_G729D_6K4) {
|
|
int16_t exc_new[SUBFRAME_SIZE];
|
|
|
|
ctx->onset = g729d_onset_decision(ctx->onset, ctx->past_gain_code);
|
|
ctx->voice_decision = g729d_voice_decision(ctx->onset, ctx->voice_decision, ctx->past_gain_pitch);
|
|
|
|
g729d_get_new_exc(exc_new, ctx->exc + i * SUBFRAME_SIZE, fc, ctx->voice_decision, ctx->past_gain_code[0], SUBFRAME_SIZE);
|
|
|
|
ff_celp_lp_synthesis_filter(
|
|
synth+10,
|
|
&lp[i][1],
|
|
exc_new,
|
|
SUBFRAME_SIZE,
|
|
10,
|
|
0,
|
|
0,
|
|
0x800);
|
|
} else {
|
|
ff_celp_lp_synthesis_filter(
|
|
synth+10,
|
|
&lp[i][1],
|
|
ctx->exc + i * SUBFRAME_SIZE,
|
|
SUBFRAME_SIZE,
|
|
10,
|
|
0,
|
|
0,
|
|
0x800);
|
|
}
|
|
/* Save data (without postfilter) for use in next subframe. */
|
|
memcpy(ctx->syn_filter_data, synth+SUBFRAME_SIZE, 10 * sizeof(int16_t));
|
|
|
|
/* Calculate gain of unfiltered signal for use in AGC. */
|
|
gain_before = 0;
|
|
for (j = 0; j < SUBFRAME_SIZE; j++)
|
|
gain_before += FFABS(synth[j+10]);
|
|
|
|
/* Call postfilter and also update voicing decision for use in next frame. */
|
|
ff_g729_postfilter(
|
|
&s->adsp,
|
|
&ctx->ht_prev_data,
|
|
&is_periodic,
|
|
&lp[i][0],
|
|
pitch_delay_int[0],
|
|
ctx->residual,
|
|
ctx->res_filter_data,
|
|
ctx->pos_filter_data,
|
|
synth+10,
|
|
SUBFRAME_SIZE);
|
|
|
|
/* Calculate gain of filtered signal for use in AGC. */
|
|
gain_after = 0;
|
|
for (j = 0; j < SUBFRAME_SIZE; j++)
|
|
gain_after += FFABS(synth[j+10]);
|
|
|
|
ctx->gain_coeff = ff_g729_adaptive_gain_control(
|
|
gain_before,
|
|
gain_after,
|
|
synth+10,
|
|
SUBFRAME_SIZE,
|
|
ctx->gain_coeff);
|
|
|
|
if (frame_erasure) {
|
|
ctx->pitch_delay_int_prev = FFMIN(ctx->pitch_delay_int_prev + 1, PITCH_DELAY_MAX);
|
|
} else {
|
|
ctx->pitch_delay_int_prev = pitch_delay_int[i];
|
|
}
|
|
|
|
memcpy(synth+8, ctx->hpf_z, 2*sizeof(int16_t));
|
|
ff_acelp_high_pass_filter(
|
|
out_frame + i*SUBFRAME_SIZE,
|
|
ctx->hpf_f,
|
|
synth+10,
|
|
SUBFRAME_SIZE);
|
|
memcpy(ctx->hpf_z, synth+8+SUBFRAME_SIZE, 2*sizeof(int16_t));
|
|
}
|
|
|
|
ctx->was_periodic = is_periodic;
|
|
|
|
/* Save signal for use in next frame. */
|
|
memmove(ctx->exc_base, ctx->exc_base + 2 * SUBFRAME_SIZE, (PITCH_DELAY_MAX+INTERPOL_LEN)*sizeof(int16_t));
|
|
|
|
buf += format->block_size;
|
|
ctx++;
|
|
}
|
|
|
|
*got_frame_ptr = 1;
|
|
return (format->block_size + (avctx->codec_id == AV_CODEC_ID_ACELP_KELVIN)) * avctx->channels;
|
|
}
|
|
|
|
static av_cold int decode_close(AVCodecContext *avctx)
|
|
{
|
|
G729Context *s = avctx->priv_data;
|
|
av_freep(&s->channel_context);
|
|
|
|
return 0;
|
|
}
|
|
|
|
AVCodec ff_g729_decoder = {
|
|
.name = "g729",
|
|
.long_name = NULL_IF_CONFIG_SMALL("G.729"),
|
|
.type = AVMEDIA_TYPE_AUDIO,
|
|
.id = AV_CODEC_ID_G729,
|
|
.priv_data_size = sizeof(G729Context),
|
|
.init = decoder_init,
|
|
.decode = decode_frame,
|
|
.close = decode_close,
|
|
.capabilities = AV_CODEC_CAP_SUBFRAMES | AV_CODEC_CAP_DR1,
|
|
};
|
|
|
|
AVCodec ff_acelp_kelvin_decoder = {
|
|
.name = "acelp.kelvin",
|
|
.long_name = NULL_IF_CONFIG_SMALL("Sipro ACELP.KELVIN"),
|
|
.type = AVMEDIA_TYPE_AUDIO,
|
|
.id = AV_CODEC_ID_ACELP_KELVIN,
|
|
.priv_data_size = sizeof(G729Context),
|
|
.init = decoder_init,
|
|
.decode = decode_frame,
|
|
.close = decode_close,
|
|
.capabilities = AV_CODEC_CAP_SUBFRAMES | AV_CODEC_CAP_DR1,
|
|
};
|