mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-12-07 11:13:41 +02:00
504d5804ac
See: LsptoA() and L_add() Fixes: 1758/clusterfuzz-testcase-minimized-6054857184116736 Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
262 lines
8.0 KiB
C
262 lines
8.0 KiB
C
/*
|
|
* G.723.1 compatible decoder
|
|
* 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
|
|
*/
|
|
|
|
#include <stdint.h>
|
|
|
|
#include "libavutil/common.h"
|
|
|
|
#include "acelp_vectors.h"
|
|
#include "avcodec.h"
|
|
#include "celp_math.h"
|
|
#include "g723_1.h"
|
|
|
|
int ff_g723_1_scale_vector(int16_t *dst, const int16_t *vector, int length)
|
|
{
|
|
int bits, max = 0;
|
|
int i;
|
|
|
|
for (i = 0; i < length; i++)
|
|
max |= FFABS(vector[i]);
|
|
|
|
bits= 14 - av_log2_16bit(max);
|
|
bits= FFMAX(bits, 0);
|
|
|
|
for (i = 0; i < length; i++)
|
|
dst[i] = (vector[i] * (1 << bits)) >> 3;
|
|
|
|
return bits - 3;
|
|
}
|
|
|
|
int ff_g723_1_normalize_bits(int num, int width)
|
|
{
|
|
return width - av_log2(num) - 1;
|
|
}
|
|
|
|
int ff_g723_1_dot_product(const int16_t *a, const int16_t *b, int length)
|
|
{
|
|
int sum = ff_dot_product(a, b, length);
|
|
return av_sat_add32(sum, sum);
|
|
}
|
|
|
|
void ff_g723_1_get_residual(int16_t *residual, int16_t *prev_excitation,
|
|
int lag)
|
|
{
|
|
int offset = PITCH_MAX - PITCH_ORDER / 2 - lag;
|
|
int i;
|
|
|
|
residual[0] = prev_excitation[offset];
|
|
residual[1] = prev_excitation[offset + 1];
|
|
|
|
offset += 2;
|
|
for (i = 2; i < SUBFRAME_LEN + PITCH_ORDER - 1; i++)
|
|
residual[i] = prev_excitation[offset + (i - 2) % lag];
|
|
}
|
|
|
|
void ff_g723_1_gen_dirac_train(int16_t *buf, int pitch_lag)
|
|
{
|
|
int16_t vector[SUBFRAME_LEN];
|
|
int i, j;
|
|
|
|
memcpy(vector, buf, SUBFRAME_LEN * sizeof(*vector));
|
|
for (i = pitch_lag; i < SUBFRAME_LEN; i += pitch_lag) {
|
|
for (j = 0; j < SUBFRAME_LEN - i; j++)
|
|
buf[i + j] += vector[j];
|
|
}
|
|
}
|
|
|
|
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)
|
|
{
|
|
int16_t residual[SUBFRAME_LEN + PITCH_ORDER - 1];
|
|
const int16_t *cb_ptr;
|
|
int lag = pitch_lag + subfrm->ad_cb_lag - 1;
|
|
|
|
int i;
|
|
int sum;
|
|
|
|
ff_g723_1_get_residual(residual, prev_excitation, lag);
|
|
|
|
/* Select quantization table */
|
|
if (cur_rate == RATE_6300 && pitch_lag < SUBFRAME_LEN - 2) {
|
|
cb_ptr = adaptive_cb_gain85;
|
|
} else
|
|
cb_ptr = adaptive_cb_gain170;
|
|
|
|
/* Calculate adaptive vector */
|
|
cb_ptr += subfrm->ad_cb_gain * 20;
|
|
for (i = 0; i < SUBFRAME_LEN; i++) {
|
|
sum = ff_dot_product(residual + i, cb_ptr, PITCH_ORDER);
|
|
vector[i] = av_sat_dadd32(1 << 15, av_sat_add32(sum, sum)) >> 16;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Convert LSP frequencies to LPC coefficients.
|
|
*
|
|
* @param lpc buffer for LPC coefficients
|
|
*/
|
|
static void lsp2lpc(int16_t *lpc)
|
|
{
|
|
int f1[LPC_ORDER / 2 + 1];
|
|
int f2[LPC_ORDER / 2 + 1];
|
|
int i, j;
|
|
|
|
/* Calculate negative cosine */
|
|
for (j = 0; j < LPC_ORDER; j++) {
|
|
int index = (lpc[j] >> 7) & 0x1FF;
|
|
int offset = lpc[j] & 0x7f;
|
|
int temp1 = cos_tab[index] * (1 << 16);
|
|
int temp2 = (cos_tab[index + 1] - cos_tab[index]) *
|
|
(((offset << 8) + 0x80) << 1);
|
|
|
|
lpc[j] = -(av_sat_dadd32(1 << 15, temp1 + temp2) >> 16);
|
|
}
|
|
|
|
/*
|
|
* Compute sum and difference polynomial coefficients
|
|
* (bitexact alternative to lsp2poly() in lsp.c)
|
|
*/
|
|
/* Initialize with values in Q28 */
|
|
f1[0] = 1 << 28;
|
|
f1[1] = (lpc[0] + lpc[2]) * (1 << 14);
|
|
f1[2] = lpc[0] * lpc[2] + (2 << 28);
|
|
|
|
f2[0] = 1 << 28;
|
|
f2[1] = (lpc[1] + lpc[3]) * (1 << 14);
|
|
f2[2] = lpc[1] * lpc[3] + (2 << 28);
|
|
|
|
/*
|
|
* Calculate and scale the coefficients by 1/2 in
|
|
* each iteration for a final scaling factor of Q25
|
|
*/
|
|
for (i = 2; i < LPC_ORDER / 2; i++) {
|
|
f1[i + 1] = av_clipl_int32(f1[i - 1] + (int64_t)MULL2(f1[i], lpc[2 * i]));
|
|
f2[i + 1] = av_clipl_int32(f2[i - 1] + (int64_t)MULL2(f2[i], lpc[2 * i + 1]));
|
|
|
|
for (j = i; j >= 2; j--) {
|
|
f1[j] = MULL2(f1[j - 1], lpc[2 * i]) +
|
|
(f1[j] >> 1) + (f1[j - 2] >> 1);
|
|
f2[j] = MULL2(f2[j - 1], lpc[2 * i + 1]) +
|
|
(f2[j] >> 1) + (f2[j - 2] >> 1);
|
|
}
|
|
|
|
f1[0] >>= 1;
|
|
f2[0] >>= 1;
|
|
f1[1] = ((lpc[2 * i] * 65536 >> i) + f1[1]) >> 1;
|
|
f2[1] = ((lpc[2 * i + 1] * 65536 >> i) + f2[1]) >> 1;
|
|
}
|
|
|
|
/* Convert polynomial coefficients to LPC coefficients */
|
|
for (i = 0; i < LPC_ORDER / 2; i++) {
|
|
int64_t ff1 = f1[i + 1] + f1[i];
|
|
int64_t ff2 = f2[i + 1] - f2[i];
|
|
|
|
lpc[i] = av_clipl_int32(((ff1 + ff2) * 8) + (1 << 15)) >> 16;
|
|
lpc[LPC_ORDER - i - 1] = av_clipl_int32(((ff1 - ff2) * 8) +
|
|
(1 << 15)) >> 16;
|
|
}
|
|
}
|
|
|
|
void ff_g723_1_lsp_interpolate(int16_t *lpc, int16_t *cur_lsp,
|
|
int16_t *prev_lsp)
|
|
{
|
|
int i;
|
|
int16_t *lpc_ptr = lpc;
|
|
|
|
/* cur_lsp * 0.25 + prev_lsp * 0.75 */
|
|
ff_acelp_weighted_vector_sum(lpc, cur_lsp, prev_lsp,
|
|
4096, 12288, 1 << 13, 14, LPC_ORDER);
|
|
ff_acelp_weighted_vector_sum(lpc + LPC_ORDER, cur_lsp, prev_lsp,
|
|
8192, 8192, 1 << 13, 14, LPC_ORDER);
|
|
ff_acelp_weighted_vector_sum(lpc + 2 * LPC_ORDER, cur_lsp, prev_lsp,
|
|
12288, 4096, 1 << 13, 14, LPC_ORDER);
|
|
memcpy(lpc + 3 * LPC_ORDER, cur_lsp, LPC_ORDER * sizeof(*lpc));
|
|
|
|
for (i = 0; i < SUBFRAMES; i++) {
|
|
lsp2lpc(lpc_ptr);
|
|
lpc_ptr += LPC_ORDER;
|
|
}
|
|
}
|
|
|
|
void ff_g723_1_inverse_quant(int16_t *cur_lsp, int16_t *prev_lsp,
|
|
uint8_t *lsp_index, int bad_frame)
|
|
{
|
|
int min_dist, pred;
|
|
int i, j, temp, stable;
|
|
|
|
/* Check for frame erasure */
|
|
if (!bad_frame) {
|
|
min_dist = 0x100;
|
|
pred = 12288;
|
|
} else {
|
|
min_dist = 0x200;
|
|
pred = 23552;
|
|
lsp_index[0] = lsp_index[1] = lsp_index[2] = 0;
|
|
}
|
|
|
|
/* Get the VQ table entry corresponding to the transmitted index */
|
|
cur_lsp[0] = lsp_band0[lsp_index[0]][0];
|
|
cur_lsp[1] = lsp_band0[lsp_index[0]][1];
|
|
cur_lsp[2] = lsp_band0[lsp_index[0]][2];
|
|
cur_lsp[3] = lsp_band1[lsp_index[1]][0];
|
|
cur_lsp[4] = lsp_band1[lsp_index[1]][1];
|
|
cur_lsp[5] = lsp_band1[lsp_index[1]][2];
|
|
cur_lsp[6] = lsp_band2[lsp_index[2]][0];
|
|
cur_lsp[7] = lsp_band2[lsp_index[2]][1];
|
|
cur_lsp[8] = lsp_band2[lsp_index[2]][2];
|
|
cur_lsp[9] = lsp_band2[lsp_index[2]][3];
|
|
|
|
/* Add predicted vector & DC component to the previously quantized vector */
|
|
for (i = 0; i < LPC_ORDER; i++) {
|
|
temp = ((prev_lsp[i] - dc_lsp[i]) * pred + (1 << 14)) >> 15;
|
|
cur_lsp[i] += dc_lsp[i] + temp;
|
|
}
|
|
|
|
for (i = 0; i < LPC_ORDER; i++) {
|
|
cur_lsp[0] = FFMAX(cur_lsp[0], 0x180);
|
|
cur_lsp[LPC_ORDER - 1] = FFMIN(cur_lsp[LPC_ORDER - 1], 0x7e00);
|
|
|
|
/* Stability check */
|
|
for (j = 1; j < LPC_ORDER; j++) {
|
|
temp = min_dist + cur_lsp[j - 1] - cur_lsp[j];
|
|
if (temp > 0) {
|
|
temp >>= 1;
|
|
cur_lsp[j - 1] -= temp;
|
|
cur_lsp[j] += temp;
|
|
}
|
|
}
|
|
stable = 1;
|
|
for (j = 1; j < LPC_ORDER; j++) {
|
|
temp = cur_lsp[j - 1] + min_dist - cur_lsp[j] - 4;
|
|
if (temp > 0) {
|
|
stable = 0;
|
|
break;
|
|
}
|
|
}
|
|
if (stable)
|
|
break;
|
|
}
|
|
if (!stable)
|
|
memcpy(cur_lsp, prev_lsp, LPC_ORDER * sizeof(*cur_lsp));
|
|
}
|