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/* |
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* SIPR decoder for the 16k mode |
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* |
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* Copyright (c) 2008 Vladimir Voroshilov |
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* Copyright (c) 2009 Vitor Sessak |
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* |
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* This file is part of FFmpeg. |
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* |
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* FFmpeg is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* FFmpeg is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with FFmpeg; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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#include <math.h> |
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#include "sipr.h" |
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#include "libavutil/attributes.h" |
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#include "libavutil/common.h" |
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#include "libavutil/float_dsp.h" |
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#include "libavutil/mathematics.h" |
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#include "lsp.h" |
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#include "acelp_vectors.h" |
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#include "acelp_pitch_delay.h" |
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#include "acelp_filters.h" |
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#include "celp_filters.h" |
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#include "sipr16kdata.h" |
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/** |
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* Convert an lsf vector into an lsp vector. |
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* |
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* @param lsf input lsf vector |
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* @param lsp output lsp vector |
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*/ |
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static void lsf2lsp(const float *lsf, double *lsp) |
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{ |
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int i; |
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✓✓ |
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for (i = 0; i < LP_FILTER_ORDER_16k; i++) |
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lsp[i] = cosf(lsf[i]); |
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} |
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static void dequant(float *out, const int *idx, const float * const cbs[]) |
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{ |
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int i; |
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✓✓ |
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for (i = 0; i < 4; i++) |
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memcpy(out + 3*i, cbs[i] + 3*idx[i], 3*sizeof(float)); |
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memcpy(out + 12, cbs[4] + 4*idx[4], 4*sizeof(float)); |
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} |
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static void lsf_decode_fp_16k(float* lsf_history, float* isp_new, |
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const int* parm, int ma_pred) |
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{ |
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int i; |
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float isp_q[LP_FILTER_ORDER_16k]; |
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dequant(isp_q, parm, lsf_codebooks_16k); |
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✓✓ |
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for (i = 0; i < LP_FILTER_ORDER_16k; i++) { |
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isp_new[i] = (1 - qu[ma_pred]) * isp_q[i] |
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+ qu[ma_pred] * lsf_history[i] |
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+ mean_lsf_16k[i]; |
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} |
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memcpy(lsf_history, isp_q, LP_FILTER_ORDER_16k * sizeof(float)); |
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} |
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static int dec_delay3_1st(int index) |
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{ |
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✓✓ |
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if (index < 390) { |
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return index + 88; |
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} else |
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return 3 * index - 690; |
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} |
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static int dec_delay3_2nd(int index, int pit_min, int pit_max, |
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int pitch_lag_prev) |
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{ |
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✓✗ |
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if (index < 62) { |
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int pitch_delay_min = av_clip(pitch_lag_prev - 10, |
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pit_min, pit_max - 19); |
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return 3 * pitch_delay_min + index - 2; |
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} else |
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return 3 * pitch_lag_prev; |
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} |
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static void postfilter(float *out_data, float* synth, float* iir_mem, |
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float* filt_mem[2], float* mem_preemph) |
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{ |
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float buf[30 + LP_FILTER_ORDER_16k]; |
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float *tmpbuf = buf + LP_FILTER_ORDER_16k; |
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float s; |
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int i; |
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✓✓ |
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for (i = 0; i < LP_FILTER_ORDER_16k; i++) |
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filt_mem[0][i] = iir_mem[i] * ff_pow_0_5[i]; |
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memcpy(tmpbuf - LP_FILTER_ORDER_16k, mem_preemph, |
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LP_FILTER_ORDER_16k*sizeof(*buf)); |
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ff_celp_lp_synthesis_filterf(tmpbuf, filt_mem[1], synth, 30, |
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LP_FILTER_ORDER_16k); |
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memcpy(synth - LP_FILTER_ORDER_16k, mem_preemph, |
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LP_FILTER_ORDER_16k * sizeof(*synth)); |
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ff_celp_lp_synthesis_filterf(synth, filt_mem[0], synth, 30, |
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LP_FILTER_ORDER_16k); |
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memcpy(out_data + 30 - LP_FILTER_ORDER_16k, |
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synth + 30 - LP_FILTER_ORDER_16k, |
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LP_FILTER_ORDER_16k * sizeof(*synth)); |
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ff_celp_lp_synthesis_filterf(out_data + 30, filt_mem[0], |
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synth + 30, 2 * L_SUBFR_16k - 30, |
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LP_FILTER_ORDER_16k); |
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memcpy(mem_preemph, out_data + 2*L_SUBFR_16k - LP_FILTER_ORDER_16k, |
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LP_FILTER_ORDER_16k * sizeof(*synth)); |
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FFSWAP(float *, filt_mem[0], filt_mem[1]); |
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✓✓ |
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for (i = 0, s = 0; i < 30; i++, s += 1.0/30) |
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out_data[i] = tmpbuf[i] + s * (synth[i] - tmpbuf[i]); |
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} |
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/** |
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* Floating point version of ff_acelp_lp_decode(). |
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*/ |
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static void acelp_lp_decodef(float *lp_1st, float *lp_2nd, |
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const double *lsp_2nd, const double *lsp_prev) |
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{ |
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double lsp_1st[LP_FILTER_ORDER_16k]; |
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int i; |
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/* LSP values for first subframe (3.2.5 of G.729, Equation 24) */ |
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✓✓ |
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for (i = 0; i < LP_FILTER_ORDER_16k; i++) |
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lsp_1st[i] = (lsp_2nd[i] + lsp_prev[i]) * 0.5; |
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ff_acelp_lspd2lpc(lsp_1st, lp_1st, LP_FILTER_ORDER_16k >> 1); |
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/* LSP values for second subframe (3.2.5 of G.729) */ |
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ff_acelp_lspd2lpc(lsp_2nd, lp_2nd, LP_FILTER_ORDER_16k >> 1); |
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} |
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/** |
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* Floating point version of ff_acelp_decode_gain_code(). |
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*/ |
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static float acelp_decode_gain_codef(float gain_corr_factor, const float *fc_v, |
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float mr_energy, const float *quant_energy, |
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const float *ma_prediction_coeff, |
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int subframe_size, int ma_pred_order) |
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{ |
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mr_energy += avpriv_scalarproduct_float_c(quant_energy, ma_prediction_coeff, |
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ma_pred_order); |
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mr_energy = gain_corr_factor * exp(M_LN10 / 20. * mr_energy) / |
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sqrt((0.01 + avpriv_scalarproduct_float_c(fc_v, fc_v, subframe_size))); |
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return mr_energy; |
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} |
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#define DIVIDE_BY_3(x) ((x) * 10923 >> 15) |
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void ff_sipr_decode_frame_16k(SiprContext *ctx, SiprParameters *params, |
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float *out_data) |
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{ |
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int frame_size = SUBFRAME_COUNT_16k * L_SUBFR_16k; |
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float *synth = ctx->synth_buf + LP_FILTER_ORDER_16k; |
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float lsf_new[LP_FILTER_ORDER_16k]; |
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double lsp_new[LP_FILTER_ORDER_16k]; |
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float Az[2][LP_FILTER_ORDER_16k]; |
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float fixed_vector[L_SUBFR_16k]; |
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float pitch_fac, gain_code; |
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int i; |
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int pitch_delay_3x; |
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float *excitation = ctx->excitation + 292; |
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lsf_decode_fp_16k(ctx->lsf_history, lsf_new, params->vq_indexes, |
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params->ma_pred_switch); |
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ff_set_min_dist_lsf(lsf_new, LSFQ_DIFF_MIN / 2, LP_FILTER_ORDER_16k); |
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lsf2lsp(lsf_new, lsp_new); |
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acelp_lp_decodef(Az[0], Az[1], lsp_new, ctx->lsp_history_16k); |
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memcpy(ctx->lsp_history_16k, lsp_new, LP_FILTER_ORDER_16k * sizeof(double)); |
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memcpy(synth - LP_FILTER_ORDER_16k, ctx->synth, |
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LP_FILTER_ORDER_16k * sizeof(*synth)); |
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✓✓ |
9753 |
for (i = 0; i < SUBFRAME_COUNT_16k; i++) { |
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int i_subfr = i * L_SUBFR_16k; |
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AMRFixed f; |
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float gain_corr_factor; |
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int pitch_delay_int; |
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int pitch_delay_frac; |
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✓✓ |
6502 |
if (!i) { |
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3251 |
pitch_delay_3x = dec_delay3_1st(params->pitch_delay[i]); |
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} else |
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pitch_delay_3x = dec_delay3_2nd(params->pitch_delay[i], |
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PITCH_MIN, PITCH_MAX, |
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ctx->pitch_lag_prev); |
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pitch_fac = gain_pitch_cb_16k[params->gp_index[i]]; |
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✓✓ |
6502 |
f.pitch_fac = FFMIN(pitch_fac, 1.0); |
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f.pitch_lag = DIVIDE_BY_3(pitch_delay_3x+1); |
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ctx->pitch_lag_prev = f.pitch_lag; |
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pitch_delay_int = DIVIDE_BY_3(pitch_delay_3x + 2); |
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pitch_delay_frac = pitch_delay_3x + 2 - 3*pitch_delay_int; |
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ff_acelp_interpolatef(&excitation[i_subfr], |
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&excitation[i_subfr] - pitch_delay_int + 1, |
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sinc_win, 3, pitch_delay_frac + 1, |
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LP_FILTER_ORDER, L_SUBFR_16k); |
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memset(fixed_vector, 0, sizeof(fixed_vector)); |
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ff_decode_10_pulses_35bits(params->fc_indexes[i], &f, |
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ff_fc_4pulses_8bits_tracks_13, 5, 4); |
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ff_set_fixed_vector(fixed_vector, &f, 1.0, L_SUBFR_16k); |
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gain_corr_factor = gain_cb_16k[params->gc_index[i]]; |
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gain_code = gain_corr_factor * |
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acelp_decode_gain_codef(sqrt(L_SUBFR_16k), fixed_vector, |
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19.0 - 15.0/(0.05*M_LN10/M_LN2), |
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pred_16k, ctx->energy_history, |
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L_SUBFR_16k, 2); |
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ctx->energy_history[1] = ctx->energy_history[0]; |
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ctx->energy_history[0] = 20.0 * log10f(gain_corr_factor); |
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ff_weighted_vector_sumf(&excitation[i_subfr], &excitation[i_subfr], |
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fixed_vector, pitch_fac, |
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gain_code, L_SUBFR_16k); |
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ff_celp_lp_synthesis_filterf(synth + i_subfr, Az[i], |
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&excitation[i_subfr], L_SUBFR_16k, |
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LP_FILTER_ORDER_16k); |
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} |
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memcpy(ctx->synth, synth + frame_size - LP_FILTER_ORDER_16k, |
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LP_FILTER_ORDER_16k * sizeof(*synth)); |
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memmove(ctx->excitation, ctx->excitation + 2 * L_SUBFR_16k, |
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(L_INTERPOL+PITCH_MAX) * sizeof(float)); |
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postfilter(out_data, synth, ctx->iir_mem, ctx->filt_mem, ctx->mem_preemph); |
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memcpy(ctx->iir_mem, Az[1], LP_FILTER_ORDER_16k * sizeof(float)); |
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} |
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av_cold void ff_sipr_init_16k(SiprContext *ctx) |
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{ |
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int i; |
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✓✓ |
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for (i = 0; i < LP_FILTER_ORDER_16k; i++) |
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ctx->lsp_history_16k[i] = cos((i + 1) * M_PI/(LP_FILTER_ORDER_16k + 1)); |
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ctx->filt_mem[0] = ctx->filt_buf[0]; |
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ctx->filt_mem[1] = ctx->filt_buf[1]; |
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ctx->pitch_lag_prev = 180; |
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} |