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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
This commit is contained in:
Kenan Gillet 2008-12-02 16:48:05 +00:00 committed by Vitor Sessak
parent 2ba0cdd527
commit 73b458e354
8 changed files with 164 additions and 6 deletions
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1
Changelog
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@ -141,6 +141,7 @@ version <next>
- Speex decoding via libspeex
- Electronic Arts TGQ decoder
- RV40 decoder
- QCELP / PureVoice decoder
version 0.4.9-pre1:

1
doc/general.texi
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@ -397,6 +397,7 @@ following image formats are supported:
@item Musepack @tab @tab X
@tab SV7 and SV8 are supported.
@item Nellymoser ASAO @tab X @tab X
@item QCELP / PureVoice @tab @tab X
@item Qdesign QDM2 @tab @tab X
@tab There are still some distortions.
@item QT IMA ADPCM @tab X @tab X

1
libavcodec/Makefile
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@ -158,6 +158,7 @@ OBJS-$(CONFIG_PNG_DECODER) += png.o pngdec.o
OBJS-$(CONFIG_PNG_ENCODER) += png.o pngenc.o
OBJS-$(CONFIG_PPM_ENCODER) += pnmenc.o pnm.o
OBJS-$(CONFIG_PTX_DECODER) += ptx.o
OBJS-$(CONFIG_QCELP_DECODER) += qcelpdec.o qcelp_lsp.o celp_math.o celp_filters.o
OBJS-$(CONFIG_QDM2_DECODER) += qdm2.o mpegaudiodec.o mpegaudiodecheader.o mpegaudio.o mpegaudiodata.o
OBJS-$(CONFIG_QDRAW_DECODER) += qdrw.o
OBJS-$(CONFIG_QPEG_DECODER) += qpeg.o

1
libavcodec/allcodecs.c
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@ -204,6 +204,7 @@ void avcodec_register_all(void)
REGISTER_DECODER (MPC7, mpc7);
REGISTER_DECODER (MPC8, mpc8);
REGISTER_ENCDEC (NELLYMOSER, nellymoser);
REGISTER_DECODER (QCELP, qcelp);
REGISTER_DECODER (QDM2, qdm2);
REGISTER_DECODER (RA_144, ra_144);
REGISTER_DECODER (RA_288, ra_288);

2
libavcodec/avcodec.h
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@ -30,7 +30,7 @@
#include "libavutil/avutil.h"
#define LIBAVCODEC_VERSION_MAJOR 52
#define LIBAVCODEC_VERSION_MINOR 5
#define LIBAVCODEC_VERSION_MINOR 6
#define LIBAVCODEC_VERSION_MICRO 0
#define LIBAVCODEC_VERSION_INT AV_VERSION_INT(LIBAVCODEC_VERSION_MAJOR, \

100
libavcodec/qcelp_lsp.c Normal file
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@ -0,0 +1,100 @@
/*
* QCELP decoder
* Copyright (c) 2007 Reynaldo H. Verdejo Pinochet
*
* 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
*/
/**
* @file qcelp_lsp.c
* QCELP decoder
* @author Reynaldo H. Verdejo Pinochet
*/
#include "libavutil/mathematics.h"
/**
* initial coefficient to perform bandwidth expansion on LPC
*
* @note: 0.9883 looks like an approximation of 253/256.
*
* TIA/EIA/IS-733 2.4.3.3.6 6
*/
#define QCELP_BANDWITH_EXPANSION_COEFF 0.9883
/**
* Computes the Pa / (1 + z(-1)) or Qa / (1 - z(-1)) coefficients
* needed for LSP to LPC conversion.
* We only need to calculate the 6 first elements of the polynomial.
*
* @param lspf line spectral pair frequencies
* @param f [out] polynomial input/output as a vector
*
* TIA/EIA/IS-733 2.4.3.3.5-1/2
*/
static void lsp2polyf(const float *lspf, double *f, int lp_half_order)
{
int i, j;
f[0] = 1.0;
f[1] = -2 * cos(M_PI * lspf[0]);
lspf -= 2;
for(i=2; i<=lp_half_order; i++)
{
double val = -2 * cos(M_PI * lspf[2*i]);
f[i] = val * f[i-1] + 2*f[i-2];
for(j=i-1; j>1; j--)
f[j] += f[j-1] * val + f[j-2];
f[1] += val;
}
}
/**
* Reconstructs LPC coefficients from the line spectral pair frequencies
* and performs bandwidth expansion.
*
* @param lspf line spectral pair frequencies
* @param lpc linear predictive coding coefficients
*
* @note: bandwith_expansion_coeff could be precalculated into a table
* but it seems to be slower on x86
*
* TIA/EIA/IS-733 2.4.3.3.5
*/
void ff_qcelp_lspf2lpc(const float *lspf, float *lpc)
{
double pa[6], qa[6];
int i;
double bandwith_expansion_coeff = -QCELP_BANDWITH_EXPANSION_COEFF * 0.5;
lsp2polyf(lspf, pa, 5);
lsp2polyf(lspf + 1, qa, 5);
for (i=4; i>=0; i--)
{
double paf = pa[i+1] + pa[i];
double qaf = qa[i+1] - qa[i];
lpc[i ] = paf + qaf;
lpc[9-i] = paf - qaf;
}
for (i=0; i<10; i++)
{
lpc[i] *= bandwith_expansion_coeff;
bandwith_expansion_coeff *= QCELP_BANDWITH_EXPANSION_COEFF;
}
}

62
libavcodec/qcelpdec.c
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@ -65,8 +65,8 @@ typedef struct {
float last_codebook_gain;
int prev_g1[2];
int prev_bitrate;
float prev_pitch_gain[4];
uint8_t prev_pitch_lag[4];
float pitch_gain[4];
uint8_t pitch_lag[4];
uint16_t first16bits;
} QCELPContext;
@ -75,7 +75,7 @@ typedef struct {
*
* TIA/EIA/IS-733 2.4.3.3.5
*/
void qcelp_lspf2lpc(const float *lspf, float *lpc);
void ff_qcelp_lspf2lpc(const float *lspf, float *lpc);
static void weighted_vector_sumf(float *out, const float *in_a,
const float *in_b, float weight_coeff_a,
@ -494,6 +494,58 @@ static const float *do_pitchfilter(float memory[303], const float v_in[160],
return memory + 143;
}
/**
* Apply pitch synthesis filter and pitch prefilter to the scaled codebook vector.
* TIA/EIA/IS-733 2.4.5.2
*
* @param q the context
* @param cdn_vector the scaled codebook vector
*/
static void apply_pitch_filters(QCELPContext *q,
float *cdn_vector) {
int i;
const float *v_synthesis_filtered, *v_pre_filtered;
if (q->bitrate >= RATE_HALF ||
(q->bitrate == I_F_Q && (q->prev_bitrate >= RATE_HALF))) {
if (q->bitrate >= RATE_HALF) {
// Compute gain & lag for the whole frame.
for (i = 0; i < 4; i++) {
q->pitch_gain[i] = q->frame.plag[i] ? (q->frame.pgain[i] + 1) * 0.25 : 0.0;
q->pitch_lag[i] = q->frame.plag[i] + 16;
}
} else {
float max_pitch_gain = q->erasure_count < 3 ? 0.9 - 0.3 * (q->erasure_count - 1)
: 0.0;
for (i = 0; i < 4; i++)
q->pitch_gain[i] = FFMIN(q->pitch_gain[i], max_pitch_gain);
memset(q->frame.pfrac, 0, sizeof(q->frame.pfrac));
}
// pitch synthesis filter
v_synthesis_filtered = do_pitchfilter(q->pitch_synthesis_filter_mem, cdn_vector,
q->pitch_gain, q->pitch_lag, q->frame.pfrac);
// pitch prefilter update
for (i = 0; i < 4; i++)
q->pitch_gain[i] = 0.5 * FFMIN(q->pitch_gain[i], 1.0);
v_pre_filtered = do_pitchfilter(q->pitch_pre_filter_mem, v_synthesis_filtered,
q->pitch_gain, q->pitch_lag, q->frame.pfrac);
apply_gain_ctrl(cdn_vector, v_synthesis_filtered, v_pre_filtered);
} else {
memcpy(q->pitch_synthesis_filter_mem, cdn_vector + 17, 143 * sizeof(float));
memcpy(q->pitch_pre_filter_mem, cdn_vector + 17, 143 * sizeof(float));
memset(q->pitch_gain, 0, sizeof(q->pitch_gain));
memset(q->pitch_lag, 0, sizeof(q->pitch_lag));
}
}
/**
* Interpolates LSP frequencies and computes LPC coefficients
* for a given bitrate & pitch subframe.
@ -522,9 +574,9 @@ void interpolate_lpc(QCELPContext *q, const float *curr_lspf, float *lpc,
{
weighted_vector_sumf(interpolated_lspf, curr_lspf, q->prev_lspf,
weight, 1.0 - weight, 10);
qcelp_lspf2lpc(interpolated_lspf, lpc);
ff_qcelp_lspf2lpc(interpolated_lspf, lpc);
}else if(q->bitrate >= RATE_QUARTER || (q->bitrate == I_F_Q && !subframe_num))
qcelp_lspf2lpc(curr_lspf, lpc);
ff_qcelp_lspf2lpc(curr_lspf, lpc);
}
static int buf_size2bitrate(const int buf_size)

2
libavformat/mov.c
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@ -988,7 +988,9 @@ static int mov_read_stsd(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)
#endif
/* no ifdef since parameters are always those */
case CODEC_ID_QCELP:
st->codec->frame_size= 160;
st->codec->channels= 1; /* really needed */
break;
case CODEC_ID_AMR_NB:
case CODEC_ID_AMR_WB:
st->codec->frame_size= sc->samples_per_frame;