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FFmpeg4/libavcodec/sipr16k.c

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/*
* SIPR decoder for the 16k mode
*
* Copyright (c) 2008 Vladimir Voroshilov
* Copyright (c) 2009 Vitor Sessak
*
* 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 <math.h>
#include "sipr.h"
#include "libavutil/attributes.h"
#include "libavutil/common.h"
#include "libavutil/float_dsp.h"
#include "libavutil/mathematics.h"
#include "lsp.h"
#include "acelp_vectors.h"
#include "acelp_pitch_delay.h"
#include "acelp_filters.h"
#include "celp_filters.h"
#include "sipr16kdata.h"
/**
* Convert an lsf vector into an lsp vector.
*
* @param lsf input lsf vector
* @param lsp output lsp vector
*/
static void lsf2lsp(const float *lsf, double *lsp)
{
int i;
for (i = 0; i < LP_FILTER_ORDER_16k; i++)
lsp[i] = cosf(lsf[i]);
}
static void dequant(float *out, const int *idx, const float * const cbs[])
{
int i;
for (i = 0; i < 4; i++)
memcpy(out + 3*i, cbs[i] + 3*idx[i], 3*sizeof(float));
memcpy(out + 12, cbs[4] + 4*idx[4], 4*sizeof(float));
}
static void lsf_decode_fp_16k(float* lsf_history, float* isp_new,
const int* parm, int ma_pred)
{
int i;
float isp_q[LP_FILTER_ORDER_16k];
dequant(isp_q, parm, lsf_codebooks_16k);
for (i = 0; i < LP_FILTER_ORDER_16k; i++) {
isp_new[i] = (1 - qu[ma_pred]) * isp_q[i]
+ qu[ma_pred] * lsf_history[i]
+ mean_lsf_16k[i];
}
memcpy(lsf_history, isp_q, LP_FILTER_ORDER_16k * sizeof(float));
}
static int dec_delay3_1st(int index)
{
if (index < 390) {
return index + 88;
} else
return 3 * index - 690;
}
static int dec_delay3_2nd(int index, int pit_min, int pit_max,
int pitch_lag_prev)
{
if (index < 62) {
int pitch_delay_min = av_clip(pitch_lag_prev - 10,
pit_min, pit_max - 19);
return 3 * pitch_delay_min + index - 2;
} else
return 3 * pitch_lag_prev;
}
static void postfilter(float *out_data, float* synth, float* iir_mem,
float* filt_mem[2], float* mem_preemph)
{
float buf[30 + LP_FILTER_ORDER_16k];
float *tmpbuf = buf + LP_FILTER_ORDER_16k;
float s;
int i;
for (i = 0; i < LP_FILTER_ORDER_16k; i++)
filt_mem[0][i] = iir_mem[i] * ff_pow_0_5[i];
memcpy(tmpbuf - LP_FILTER_ORDER_16k, mem_preemph,
LP_FILTER_ORDER_16k*sizeof(*buf));
ff_celp_lp_synthesis_filterf(tmpbuf, filt_mem[1], synth, 30,
LP_FILTER_ORDER_16k);
memcpy(synth - LP_FILTER_ORDER_16k, mem_preemph,
LP_FILTER_ORDER_16k * sizeof(*synth));
ff_celp_lp_synthesis_filterf(synth, filt_mem[0], synth, 30,
LP_FILTER_ORDER_16k);
memcpy(out_data + 30 - LP_FILTER_ORDER_16k,
synth + 30 - LP_FILTER_ORDER_16k,
LP_FILTER_ORDER_16k * sizeof(*synth));
ff_celp_lp_synthesis_filterf(out_data + 30, filt_mem[0],
synth + 30, 2 * L_SUBFR_16k - 30,
LP_FILTER_ORDER_16k);
memcpy(mem_preemph, out_data + 2*L_SUBFR_16k - LP_FILTER_ORDER_16k,
LP_FILTER_ORDER_16k * sizeof(*synth));
FFSWAP(float *, filt_mem[0], filt_mem[1]);
for (i = 0, s = 0; i < 30; i++, s += 1.0/30)
out_data[i] = tmpbuf[i] + s * (synth[i] - tmpbuf[i]);
}
/**
* Floating point version of ff_acelp_lp_decode().
*/
static void acelp_lp_decodef(float *lp_1st, float *lp_2nd,
const double *lsp_2nd, const double *lsp_prev)
{
double lsp_1st[LP_FILTER_ORDER_16k];
int i;
/* LSP values for first subframe (3.2.5 of G.729, Equation 24) */
for (i = 0; i < LP_FILTER_ORDER_16k; i++)
lsp_1st[i] = (lsp_2nd[i] + lsp_prev[i]) * 0.5;
ff_acelp_lspd2lpc(lsp_1st, lp_1st, LP_FILTER_ORDER_16k >> 1);
/* LSP values for second subframe (3.2.5 of G.729) */
ff_acelp_lspd2lpc(lsp_2nd, lp_2nd, LP_FILTER_ORDER_16k >> 1);
}
/**
* Floating point version of ff_acelp_decode_gain_code().
*/
static float acelp_decode_gain_codef(float gain_corr_factor, const float *fc_v,
float mr_energy, const float *quant_energy,
const float *ma_prediction_coeff,
int subframe_size, int ma_pred_order)
{
mr_energy += avpriv_scalarproduct_float_c(quant_energy, ma_prediction_coeff,
ma_pred_order);
mr_energy = gain_corr_factor * exp(M_LN10 / 20. * mr_energy) /
sqrt((0.01 + avpriv_scalarproduct_float_c(fc_v, fc_v, subframe_size)));
return mr_energy;
}
#define DIVIDE_BY_3(x) ((x) * 10923 >> 15)
void ff_sipr_decode_frame_16k(SiprContext *ctx, SiprParameters *params,
float *out_data)
{
int frame_size = SUBFRAME_COUNT_16k * L_SUBFR_16k;
float *synth = ctx->synth_buf + LP_FILTER_ORDER_16k;
float lsf_new[LP_FILTER_ORDER_16k];
double lsp_new[LP_FILTER_ORDER_16k];
float Az[2][LP_FILTER_ORDER_16k];
float fixed_vector[L_SUBFR_16k];
float pitch_fac, gain_code;
int i;
int pitch_delay_3x;
float *excitation = ctx->excitation + 292;
lsf_decode_fp_16k(ctx->lsf_history, lsf_new, params->vq_indexes,
params->ma_pred_switch);
ff_set_min_dist_lsf(lsf_new, LSFQ_DIFF_MIN / 2, LP_FILTER_ORDER_16k);
lsf2lsp(lsf_new, lsp_new);
acelp_lp_decodef(Az[0], Az[1], lsp_new, ctx->lsp_history_16k);
memcpy(ctx->lsp_history_16k, lsp_new, LP_FILTER_ORDER_16k * sizeof(double));
memcpy(synth - LP_FILTER_ORDER_16k, ctx->synth,
LP_FILTER_ORDER_16k * sizeof(*synth));
for (i = 0; i < SUBFRAME_COUNT_16k; i++) {
int i_subfr = i * L_SUBFR_16k;
AMRFixed f;
float gain_corr_factor;
int pitch_delay_int;
int pitch_delay_frac;
if (!i) {
pitch_delay_3x = dec_delay3_1st(params->pitch_delay[i]);
} else
pitch_delay_3x = dec_delay3_2nd(params->pitch_delay[i],
PITCH_MIN, PITCH_MAX,
ctx->pitch_lag_prev);
pitch_fac = gain_pitch_cb_16k[params->gp_index[i]];
f.pitch_fac = FFMIN(pitch_fac, 1.0);
f.pitch_lag = DIVIDE_BY_3(pitch_delay_3x+1);
ctx->pitch_lag_prev = f.pitch_lag;
pitch_delay_int = DIVIDE_BY_3(pitch_delay_3x + 2);
pitch_delay_frac = pitch_delay_3x + 2 - 3*pitch_delay_int;
ff_acelp_interpolatef(&excitation[i_subfr],
&excitation[i_subfr] - pitch_delay_int + 1,
sinc_win, 3, pitch_delay_frac + 1,
LP_FILTER_ORDER, L_SUBFR_16k);
memset(fixed_vector, 0, sizeof(fixed_vector));
ff_decode_10_pulses_35bits(params->fc_indexes[i], &f,
ff_fc_4pulses_8bits_tracks_13, 5, 4);
ff_set_fixed_vector(fixed_vector, &f, 1.0, L_SUBFR_16k);
gain_corr_factor = gain_cb_16k[params->gc_index[i]];
gain_code = gain_corr_factor *
acelp_decode_gain_codef(sqrt(L_SUBFR_16k), fixed_vector,
19.0 - 15.0/(0.05*M_LN10/M_LN2),
pred_16k, ctx->energy_history,
L_SUBFR_16k, 2);
ctx->energy_history[1] = ctx->energy_history[0];
ctx->energy_history[0] = 20.0 * log10f(gain_corr_factor);
ff_weighted_vector_sumf(&excitation[i_subfr], &excitation[i_subfr],
fixed_vector, pitch_fac,
gain_code, L_SUBFR_16k);
ff_celp_lp_synthesis_filterf(synth + i_subfr, Az[i],
&excitation[i_subfr], L_SUBFR_16k,
LP_FILTER_ORDER_16k);
}
memcpy(ctx->synth, synth + frame_size - LP_FILTER_ORDER_16k,
LP_FILTER_ORDER_16k * sizeof(*synth));
memmove(ctx->excitation, ctx->excitation + 2 * L_SUBFR_16k,
(L_INTERPOL+PITCH_MAX) * sizeof(float));
postfilter(out_data, synth, ctx->iir_mem, ctx->filt_mem, ctx->mem_preemph);
memcpy(ctx->iir_mem, Az[1], LP_FILTER_ORDER_16k * sizeof(float));
}
av_cold void ff_sipr_init_16k(SiprContext *ctx)
{
int i;
for (i = 0; i < LP_FILTER_ORDER_16k; i++)
ctx->lsp_history_16k[i] = cos((i + 1) * M_PI/(LP_FILTER_ORDER_16k + 1));
ctx->filt_mem[0] = ctx->filt_buf[0];
ctx->filt_mem[1] = ctx->filt_buf[1];
ctx->pitch_lag_prev = 180;
}
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