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Commit last ok'ed parts of QCELP decoder and enable it.
patch by Kenan Gillet, kenan.gillet gmail com Originally committed as revision 15978 to svn://svn.ffmpeg.org/ffmpeg/trunk
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@ -141,6 +141,7 @@ version <next>
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- Speex decoding via libspeex
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- Electronic Arts TGQ decoder
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- RV40 decoder
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- QCELP / PureVoice decoder
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version 0.4.9-pre1:
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@ -397,6 +397,7 @@ following image formats are supported:
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@item Musepack @tab @tab X
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@tab SV7 and SV8 are supported.
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@item Nellymoser ASAO @tab X @tab X
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@item QCELP / PureVoice @tab @tab X
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@item Qdesign QDM2 @tab @tab X
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@tab There are still some distortions.
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@item QT IMA ADPCM @tab X @tab X
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@ -158,6 +158,7 @@ OBJS-$(CONFIG_PNG_DECODER) += png.o pngdec.o
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OBJS-$(CONFIG_PNG_ENCODER) += png.o pngenc.o
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OBJS-$(CONFIG_PPM_ENCODER) += pnmenc.o pnm.o
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OBJS-$(CONFIG_PTX_DECODER) += ptx.o
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OBJS-$(CONFIG_QCELP_DECODER) += qcelpdec.o qcelp_lsp.o celp_math.o celp_filters.o
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OBJS-$(CONFIG_QDM2_DECODER) += qdm2.o mpegaudiodec.o mpegaudiodecheader.o mpegaudio.o mpegaudiodata.o
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OBJS-$(CONFIG_QDRAW_DECODER) += qdrw.o
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OBJS-$(CONFIG_QPEG_DECODER) += qpeg.o
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@ -204,6 +204,7 @@ void avcodec_register_all(void)
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REGISTER_DECODER (MPC7, mpc7);
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REGISTER_DECODER (MPC8, mpc8);
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REGISTER_ENCDEC (NELLYMOSER, nellymoser);
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REGISTER_DECODER (QCELP, qcelp);
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REGISTER_DECODER (QDM2, qdm2);
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REGISTER_DECODER (RA_144, ra_144);
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REGISTER_DECODER (RA_288, ra_288);
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@ -30,7 +30,7 @@
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#include "libavutil/avutil.h"
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#define LIBAVCODEC_VERSION_MAJOR 52
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#define LIBAVCODEC_VERSION_MINOR 5
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#define LIBAVCODEC_VERSION_MINOR 6
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#define LIBAVCODEC_VERSION_MICRO 0
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#define LIBAVCODEC_VERSION_INT AV_VERSION_INT(LIBAVCODEC_VERSION_MAJOR, \
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100
libavcodec/qcelp_lsp.c
Normal file
100
libavcodec/qcelp_lsp.c
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@ -0,0 +1,100 @@
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/*
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* QCELP decoder
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* Copyright (c) 2007 Reynaldo H. Verdejo Pinochet
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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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/**
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* @file qcelp_lsp.c
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* QCELP decoder
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* @author Reynaldo H. Verdejo Pinochet
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*/
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#include "libavutil/mathematics.h"
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/**
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* initial coefficient to perform bandwidth expansion on LPC
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*
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* @note: 0.9883 looks like an approximation of 253/256.
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*
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* TIA/EIA/IS-733 2.4.3.3.6 6
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*/
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#define QCELP_BANDWITH_EXPANSION_COEFF 0.9883
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/**
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* Computes the Pa / (1 + z(-1)) or Qa / (1 - z(-1)) coefficients
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* needed for LSP to LPC conversion.
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* We only need to calculate the 6 first elements of the polynomial.
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*
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* @param lspf line spectral pair frequencies
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* @param f [out] polynomial input/output as a vector
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*
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* TIA/EIA/IS-733 2.4.3.3.5-1/2
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*/
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static void lsp2polyf(const float *lspf, double *f, int lp_half_order)
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{
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int i, j;
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f[0] = 1.0;
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f[1] = -2 * cos(M_PI * lspf[0]);
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lspf -= 2;
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for(i=2; i<=lp_half_order; i++)
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{
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double val = -2 * cos(M_PI * lspf[2*i]);
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f[i] = val * f[i-1] + 2*f[i-2];
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for(j=i-1; j>1; j--)
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f[j] += f[j-1] * val + f[j-2];
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f[1] += val;
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}
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}
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/**
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* Reconstructs LPC coefficients from the line spectral pair frequencies
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* and performs bandwidth expansion.
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*
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* @param lspf line spectral pair frequencies
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* @param lpc linear predictive coding coefficients
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*
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* @note: bandwith_expansion_coeff could be precalculated into a table
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* but it seems to be slower on x86
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*
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* TIA/EIA/IS-733 2.4.3.3.5
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*/
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void ff_qcelp_lspf2lpc(const float *lspf, float *lpc)
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{
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double pa[6], qa[6];
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int i;
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double bandwith_expansion_coeff = -QCELP_BANDWITH_EXPANSION_COEFF * 0.5;
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lsp2polyf(lspf, pa, 5);
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lsp2polyf(lspf + 1, qa, 5);
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for (i=4; i>=0; i--)
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{
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double paf = pa[i+1] + pa[i];
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double qaf = qa[i+1] - qa[i];
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lpc[i ] = paf + qaf;
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lpc[9-i] = paf - qaf;
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}
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for (i=0; i<10; i++)
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{
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lpc[i] *= bandwith_expansion_coeff;
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bandwith_expansion_coeff *= QCELP_BANDWITH_EXPANSION_COEFF;
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}
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}
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@ -65,8 +65,8 @@ typedef struct {
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float last_codebook_gain;
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int prev_g1[2];
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int prev_bitrate;
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float prev_pitch_gain[4];
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uint8_t prev_pitch_lag[4];
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float pitch_gain[4];
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uint8_t pitch_lag[4];
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uint16_t first16bits;
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} QCELPContext;
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@ -75,7 +75,7 @@ typedef struct {
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*
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* TIA/EIA/IS-733 2.4.3.3.5
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*/
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void qcelp_lspf2lpc(const float *lspf, float *lpc);
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void ff_qcelp_lspf2lpc(const float *lspf, float *lpc);
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static void weighted_vector_sumf(float *out, const float *in_a,
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const float *in_b, float weight_coeff_a,
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@ -494,6 +494,58 @@ static const float *do_pitchfilter(float memory[303], const float v_in[160],
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return memory + 143;
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}
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/**
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* Apply pitch synthesis filter and pitch prefilter to the scaled codebook vector.
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* TIA/EIA/IS-733 2.4.5.2
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*
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* @param q the context
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* @param cdn_vector the scaled codebook vector
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*/
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static void apply_pitch_filters(QCELPContext *q,
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float *cdn_vector) {
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int i;
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const float *v_synthesis_filtered, *v_pre_filtered;
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if (q->bitrate >= RATE_HALF ||
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(q->bitrate == I_F_Q && (q->prev_bitrate >= RATE_HALF))) {
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if (q->bitrate >= RATE_HALF) {
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// Compute gain & lag for the whole frame.
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for (i = 0; i < 4; i++) {
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q->pitch_gain[i] = q->frame.plag[i] ? (q->frame.pgain[i] + 1) * 0.25 : 0.0;
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q->pitch_lag[i] = q->frame.plag[i] + 16;
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}
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} else {
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float max_pitch_gain = q->erasure_count < 3 ? 0.9 - 0.3 * (q->erasure_count - 1)
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: 0.0;
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for (i = 0; i < 4; i++)
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q->pitch_gain[i] = FFMIN(q->pitch_gain[i], max_pitch_gain);
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memset(q->frame.pfrac, 0, sizeof(q->frame.pfrac));
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}
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// pitch synthesis filter
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v_synthesis_filtered = do_pitchfilter(q->pitch_synthesis_filter_mem, cdn_vector,
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q->pitch_gain, q->pitch_lag, q->frame.pfrac);
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// pitch prefilter update
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for (i = 0; i < 4; i++)
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q->pitch_gain[i] = 0.5 * FFMIN(q->pitch_gain[i], 1.0);
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v_pre_filtered = do_pitchfilter(q->pitch_pre_filter_mem, v_synthesis_filtered,
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q->pitch_gain, q->pitch_lag, q->frame.pfrac);
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apply_gain_ctrl(cdn_vector, v_synthesis_filtered, v_pre_filtered);
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} else {
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memcpy(q->pitch_synthesis_filter_mem, cdn_vector + 17, 143 * sizeof(float));
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memcpy(q->pitch_pre_filter_mem, cdn_vector + 17, 143 * sizeof(float));
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memset(q->pitch_gain, 0, sizeof(q->pitch_gain));
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memset(q->pitch_lag, 0, sizeof(q->pitch_lag));
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}
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}
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/**
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* Interpolates LSP frequencies and computes LPC coefficients
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* for a given bitrate & pitch subframe.
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@ -522,9 +574,9 @@ void interpolate_lpc(QCELPContext *q, const float *curr_lspf, float *lpc,
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{
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weighted_vector_sumf(interpolated_lspf, curr_lspf, q->prev_lspf,
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weight, 1.0 - weight, 10);
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qcelp_lspf2lpc(interpolated_lspf, lpc);
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ff_qcelp_lspf2lpc(interpolated_lspf, lpc);
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}else if(q->bitrate >= RATE_QUARTER || (q->bitrate == I_F_Q && !subframe_num))
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qcelp_lspf2lpc(curr_lspf, lpc);
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ff_qcelp_lspf2lpc(curr_lspf, lpc);
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}
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static int buf_size2bitrate(const int buf_size)
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#endif
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/* no ifdef since parameters are always those */
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case CODEC_ID_QCELP:
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st->codec->frame_size= 160;
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st->codec->channels= 1; /* really needed */
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break;
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case CODEC_ID_AMR_NB:
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case CODEC_ID_AMR_WB:
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st->codec->frame_size= sc->samples_per_frame;
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