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wma encoder

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Originally committed as revision 7855 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2007-02-06 20:19:04 +00:00
parent f824ba7b61
commit 5968607304
8 changed files with 983 additions and 482 deletions
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6
libavcodec/Makefile
View File

@ -159,8 +159,10 @@ OBJS-$(CONFIG_VP5_DECODER) += vp5.o vp56.o vp56data.o
OBJS-$(CONFIG_VP6_DECODER) += vp6.o vp56.o vp56data.o
OBJS-$(CONFIG_VQA_DECODER) += vqavideo.o
OBJS-$(CONFIG_WAVPACK_DECODER) += wavpack.o
OBJS-$(CONFIG_WMAV1_DECODER) += wmadec.o
OBJS-$(CONFIG_WMAV2_DECODER) += wmadec.o
OBJS-$(CONFIG_WMAV1_DECODER) += wmadec.o wma.o
OBJS-$(CONFIG_WMAV2_DECODER) += wmadec.o wma.o
OBJS-$(CONFIG_WMAV1_ENCODER) += wmaenc.o wma.o
OBJS-$(CONFIG_WMAV2_ENCODER) += wmaenc.o wma.o
OBJS-$(CONFIG_WMV3_DECODER) += vc1.o vc1dsp.o
OBJS-$(CONFIG_WNV1_DECODER) += wnv1.o
OBJS-$(CONFIG_WS_SND1_DECODER) += ws-snd1.o

4
libavcodec/allcodecs.c
View File

@ -187,8 +187,8 @@ void avcodec_register_all(void)
REGISTER_DECODER(VMDAUDIO, vmdaudio);
REGISTER_ENCDEC (VORBIS, vorbis);
REGISTER_DECODER(WAVPACK, wavpack);
REGISTER_DECODER(WMAV1, wmav1);
REGISTER_DECODER(WMAV2, wmav2);
REGISTER_ENCDEC(WMAV1, wmav1);
REGISTER_ENCDEC(WMAV2, wmav2);
REGISTER_DECODER(WS_SND1, ws_snd1);
/* pcm codecs */

6
libavcodec/avcodec.h
View File

@ -37,8 +37,8 @@ extern "C" {
#define AV_STRINGIFY(s) AV_TOSTRING(s)
#define AV_TOSTRING(s) #s
#define LIBAVCODEC_VERSION_INT ((51<<16)+(31<<8)+0)
#define LIBAVCODEC_VERSION 51.31.0
#define LIBAVCODEC_VERSION_INT ((51<<16)+(32<<8)+0)
#define LIBAVCODEC_VERSION 51.32.0
#define LIBAVCODEC_BUILD LIBAVCODEC_VERSION_INT
#define LIBAVCODEC_IDENT "Lavc" AV_STRINGIFY(LIBAVCODEC_VERSION)
@ -2192,6 +2192,8 @@ extern AVCodec sonic_ls_encoder;
extern AVCodec svq1_encoder;
extern AVCodec vcr1_encoder;
extern AVCodec vorbis_encoder;
extern AVCodec wmav1_encoder;
extern AVCodec wmav2_encoder;
extern AVCodec wmv1_encoder;
extern AVCodec wmv2_encoder;
extern AVCodec x264_encoder;

386
libavcodec/wma.c Normal file
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@ -0,0 +1,386 @@
/*
* WMA compatible codec
* Copyright (c) 2002-2007 The FFmpeg Project.
*
* 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 "avcodec.h"
#include "wma.h"
#include "wmadata.h"
#undef NDEBUG
#include <assert.h>
/* XXX: use same run/length optimization as mpeg decoders */
//FIXME maybe split decode / encode or pass flag
static void init_coef_vlc(VLC *vlc,
uint16_t **prun_table, uint16_t **plevel_table, uint16_t **pint_table,
const CoefVLCTable *vlc_table)
{
int n = vlc_table->n;
const uint8_t *table_bits = vlc_table->huffbits;
const uint32_t *table_codes = vlc_table->huffcodes;
const uint16_t *levels_table = vlc_table->levels;
uint16_t *run_table, *level_table, *int_table;
int i, l, j, k, level;
init_vlc(vlc, VLCBITS, n, table_bits, 1, 1, table_codes, 4, 4, 0);
run_table = av_malloc(n * sizeof(uint16_t));
level_table = av_malloc(n * sizeof(uint16_t));
int_table = av_malloc(n * sizeof(uint16_t));
i = 2;
level = 1;
k = 0;
while (i < n) {
int_table[k]= i;
l = levels_table[k++];
for(j=0;j<l;j++) {
run_table[i] = j;
level_table[i] = level;
i++;
}
level++;
}
*prun_table = run_table;
*plevel_table = level_table;
*pint_table= int_table;
}
int ff_wma_init(AVCodecContext * avctx, int flags2)
{
WMADecodeContext *s = avctx->priv_data;
int i;
float *window;
float bps1, high_freq;
volatile float bps;
int sample_rate1;
int coef_vlc_table;
s->sample_rate = avctx->sample_rate;
s->nb_channels = avctx->channels;
s->bit_rate = avctx->bit_rate;
s->block_align = avctx->block_align;
dsputil_init(&s->dsp, avctx);
if (avctx->codec->id == CODEC_ID_WMAV1) {
s->version = 1;
} else {
s->version = 2;
}
/* compute MDCT block size */
if (s->sample_rate <= 16000) {
s->frame_len_bits = 9;
} else if (s->sample_rate <= 22050 ||
(s->sample_rate <= 32000 && s->version == 1)) {
s->frame_len_bits = 10;
} else {
s->frame_len_bits = 11;
}
s->frame_len = 1 << s->frame_len_bits;
if (s->use_variable_block_len) {
int nb_max, nb;
nb = ((flags2 >> 3) & 3) + 1;
if ((s->bit_rate / s->nb_channels) >= 32000)
nb += 2;
nb_max = s->frame_len_bits - BLOCK_MIN_BITS;
if (nb > nb_max)
nb = nb_max;
s->nb_block_sizes = nb + 1;
} else {
s->nb_block_sizes = 1;
}
/* init rate dependant parameters */
s->use_noise_coding = 1;
high_freq = s->sample_rate * 0.5;
/* if version 2, then the rates are normalized */
sample_rate1 = s->sample_rate;
if (s->version == 2) {
if (sample_rate1 >= 44100)
sample_rate1 = 44100;
else if (sample_rate1 >= 22050)
sample_rate1 = 22050;
else if (sample_rate1 >= 16000)
sample_rate1 = 16000;
else if (sample_rate1 >= 11025)
sample_rate1 = 11025;
else if (sample_rate1 >= 8000)
sample_rate1 = 8000;
}
bps = (float)s->bit_rate / (float)(s->nb_channels * s->sample_rate);
s->byte_offset_bits = av_log2((int)(bps * s->frame_len / 8.0 + 0.5)) + 2;
/* compute high frequency value and choose if noise coding should
be activated */
bps1 = bps;
if (s->nb_channels == 2)
bps1 = bps * 1.6;
if (sample_rate1 == 44100) {
if (bps1 >= 0.61)
s->use_noise_coding = 0;
else
high_freq = high_freq * 0.4;
} else if (sample_rate1 == 22050) {
if (bps1 >= 1.16)
s->use_noise_coding = 0;
else if (bps1 >= 0.72)
high_freq = high_freq * 0.7;
else
high_freq = high_freq * 0.6;
} else if (sample_rate1 == 16000) {
if (bps > 0.5)
high_freq = high_freq * 0.5;
else
high_freq = high_freq * 0.3;
} else if (sample_rate1 == 11025) {
high_freq = high_freq * 0.7;
} else if (sample_rate1 == 8000) {
if (bps <= 0.625) {
high_freq = high_freq * 0.5;
} else if (bps > 0.75) {
s->use_noise_coding = 0;
} else {
high_freq = high_freq * 0.65;
}
} else {
if (bps >= 0.8) {
high_freq = high_freq * 0.75;
} else if (bps >= 0.6) {
high_freq = high_freq * 0.6;
} else {
high_freq = high_freq * 0.5;
}
}
dprintf("flags1=0x%x flags2=0x%x\n", flags1, flags2);
dprintf("version=%d channels=%d sample_rate=%d bitrate=%d block_align=%d\n",
s->version, s->nb_channels, s->sample_rate, s->bit_rate,
s->block_align);
dprintf("bps=%f bps1=%f high_freq=%f bitoffset=%d\n",
bps, bps1, high_freq, s->byte_offset_bits);
dprintf("use_noise_coding=%d use_exp_vlc=%d nb_block_sizes=%d\n",
s->use_noise_coding, s->use_exp_vlc, s->nb_block_sizes);
/* compute the scale factor band sizes for each MDCT block size */
{
int a, b, pos, lpos, k, block_len, i, j, n;
const uint8_t *table;
if (s->version == 1) {
s->coefs_start = 3;
} else {
s->coefs_start = 0;
}
for(k = 0; k < s->nb_block_sizes; k++) {
block_len = s->frame_len >> k;
if (s->version == 1) {
lpos = 0;
for(i=0;i<25;i++) {
a = wma_critical_freqs[i];
b = s->sample_rate;
pos = ((block_len * 2 * a) + (b >> 1)) / b;
if (pos > block_len)
pos = block_len;
s->exponent_bands[0][i] = pos - lpos;
if (pos >= block_len) {
i++;
break;
}
lpos = pos;
}
s->exponent_sizes[0] = i;
} else {
/* hardcoded tables */
table = NULL;
a = s->frame_len_bits - BLOCK_MIN_BITS - k;
if (a < 3) {
if (s->sample_rate >= 44100)
table = exponent_band_44100[a];
else if (s->sample_rate >= 32000)
table = exponent_band_32000[a];
else if (s->sample_rate >= 22050)
table = exponent_band_22050[a];
}
if (table) {
n = *table++;
for(i=0;i<n;i++)
s->exponent_bands[k][i] = table[i];
s->exponent_sizes[k] = n;
} else {
j = 0;
lpos = 0;
for(i=0;i<25;i++) {
a = wma_critical_freqs[i];
b = s->sample_rate;
pos = ((block_len * 2 * a) + (b << 1)) / (4 * b);
pos <<= 2;
if (pos > block_len)
pos = block_len;
if (pos > lpos)
s->exponent_bands[k][j++] = pos - lpos;
if (pos >= block_len)
break;
lpos = pos;
}
s->exponent_sizes[k] = j;
}
}
/* max number of coefs */
s->coefs_end[k] = (s->frame_len - ((s->frame_len * 9) / 100)) >> k;
/* high freq computation */
s->high_band_start[k] = (int)((block_len * 2 * high_freq) /
s->sample_rate + 0.5);
n = s->exponent_sizes[k];
j = 0;
pos = 0;
for(i=0;i<n;i++) {
int start, end;
start = pos;
pos += s->exponent_bands[k][i];
end = pos;
if (start < s->high_band_start[k])
start = s->high_band_start[k];
if (end > s->coefs_end[k])
end = s->coefs_end[k];
if (end > start)
s->exponent_high_bands[k][j++] = end - start;
}
s->exponent_high_sizes[k] = j;
#if 0
tprintf("%5d: coefs_end=%d high_band_start=%d nb_high_bands=%d: ",
s->frame_len >> k,
s->coefs_end[k],
s->high_band_start[k],
s->exponent_high_sizes[k]);
for(j=0;j<s->exponent_high_sizes[k];j++)
tprintf(" %d", s->exponent_high_bands[k][j]);
tprintf("\n");
#endif
}
}
#ifdef TRACE
{
int i, j;
for(i = 0; i < s->nb_block_sizes; i++) {
tprintf("%5d: n=%2d:",
s->frame_len >> i,
s->exponent_sizes[i]);
for(j=0;j<s->exponent_sizes[i];j++)
tprintf(" %d", s->exponent_bands[i][j]);
tprintf("\n");
}
}
#endif
/* init MDCT windows : simple sinus window */
for(i = 0; i < s->nb_block_sizes; i++) {
int n, j;
float alpha;
n = 1 << (s->frame_len_bits - i);
window = av_malloc(sizeof(float) * n);
alpha = M_PI / (2.0 * n);
for(j=0;j<n;j++) {
window[n - j - 1] = sin((j + 0.5) * alpha);
}
s->windows[i] = window;
}
s->reset_block_lengths = 1;
if (s->use_noise_coding) {
/* init the noise generator */
if (s->use_exp_vlc)
s->noise_mult = 0.02;
else
s->noise_mult = 0.04;
#ifdef TRACE
for(i=0;i<NOISE_TAB_SIZE;i++)
s->noise_table[i] = 1.0 * s->noise_mult;
#else
{
unsigned int seed;
float norm;
seed = 1;
norm = (1.0 / (float)(1LL << 31)) * sqrt(3) * s->noise_mult;
for(i=0;i<NOISE_TAB_SIZE;i++) {
seed = seed * 314159 + 1;
s->noise_table[i] = (float)((int)seed) * norm;
}
}
#endif
}
/* choose the VLC tables for the coefficients */
coef_vlc_table = 2;
if (s->sample_rate >= 32000) {
if (bps1 < 0.72)
coef_vlc_table = 0;
else if (bps1 < 1.16)
coef_vlc_table = 1;
}
s->coef_vlcs[0]= &coef_vlcs[coef_vlc_table * 2 ];
s->coef_vlcs[1]= &coef_vlcs[coef_vlc_table * 2 + 1];
init_coef_vlc(&s->coef_vlc[0], &s->run_table[0], &s->level_table[0], &s->int_table[0],
s->coef_vlcs[0]);
init_coef_vlc(&s->coef_vlc[1], &s->run_table[1], &s->level_table[1], &s->int_table[1],
s->coef_vlcs[1]);
return 0;
}
int ff_wma_total_gain_to_bits(int total_gain){
if (total_gain < 15) return 13;
else if (total_gain < 32) return 12;
else if (total_gain < 40) return 11;
else if (total_gain < 45) return 10;
else return 9;
}
int ff_wma_end(AVCodecContext *avctx)
{
WMADecodeContext *s = avctx->priv_data;
int i;
for(i = 0; i < s->nb_block_sizes; i++)
ff_mdct_end(&s->mdct_ctx[i]);
for(i = 0; i < s->nb_block_sizes; i++)
av_free(s->windows[i]);
if (s->use_exp_vlc) {
free_vlc(&s->exp_vlc);
}
if (s->use_noise_coding) {
free_vlc(&s->hgain_vlc);
}
for(i = 0;i < 2; i++) {
free_vlc(&s->coef_vlc[i]);
av_free(s->run_table[i]);
av_free(s->level_table[i]);
}
return 0;
}

149
libavcodec/wma.h Normal file
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@ -0,0 +1,149 @@
/*
* WMA compatible codec
* Copyright (c) 2002-2007 The FFmpeg Project.
*
* 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
*/
#ifndef WMA_H
#define WMA_H
#include "bitstream.h"
#include "dsputil.h"
/* size of blocks */
#define BLOCK_MIN_BITS 7
#define BLOCK_MAX_BITS 11
#define BLOCK_MAX_SIZE (1 << BLOCK_MAX_BITS)
#define BLOCK_NB_SIZES (BLOCK_MAX_BITS - BLOCK_MIN_BITS + 1)
/* XXX: find exact max size */
#define HIGH_BAND_MAX_SIZE 16
#define NB_LSP_COEFS 10
/* XXX: is it a suitable value ? */
#define MAX_CODED_SUPERFRAME_SIZE 16384
#define MAX_CHANNELS 2
#define NOISE_TAB_SIZE 8192
#define LSP_POW_BITS 7
//FIXME should be in wmadec
#define VLCBITS 9
#define VLCMAX ((22+VLCBITS-1)/VLCBITS)
typedef struct CoefVLCTable {
int n; /* total number of codes */
int max_level;
const uint32_t *huffcodes; /* VLC bit values */
const uint8_t *huffbits; /* VLC bit size */
const uint16_t *levels; /* table to build run/level tables */
} CoefVLCTable;
typedef struct WMADecodeContext {
GetBitContext gb;
PutBitContext pb;
int sample_rate;
int nb_channels;
int bit_rate;
int version; /* 1 = 0x160 (WMAV1), 2 = 0x161 (WMAV2) */
int block_align;
int use_bit_reservoir;
int use_variable_block_len;
int use_exp_vlc; /* exponent coding: 0 = lsp, 1 = vlc + delta */
int use_noise_coding; /* true if perceptual noise is added */
int byte_offset_bits;
VLC exp_vlc;
int exponent_sizes[BLOCK_NB_SIZES];
uint16_t exponent_bands[BLOCK_NB_SIZES][25];
int high_band_start[BLOCK_NB_SIZES]; /* index of first coef in high band */
int coefs_start; /* first coded coef */
int coefs_end[BLOCK_NB_SIZES]; /* max number of coded coefficients */
int exponent_high_sizes[BLOCK_NB_SIZES];
int exponent_high_bands[BLOCK_NB_SIZES][HIGH_BAND_MAX_SIZE];
VLC hgain_vlc;
/* coded values in high bands */
int high_band_coded[MAX_CHANNELS][HIGH_BAND_MAX_SIZE];
int high_band_values[MAX_CHANNELS][HIGH_BAND_MAX_SIZE];
/* there are two possible tables for spectral coefficients */
//FIXME the following 3 tables should be shared between decoders
VLC coef_vlc[2];
uint16_t *run_table[2];
uint16_t *level_table[2];
uint16_t *int_table[2];
CoefVLCTable *coef_vlcs[2];
/* frame info */
int frame_len; /* frame length in samples */
int frame_len_bits; /* frame_len = 1 << frame_len_bits */
int nb_block_sizes; /* number of block sizes */
/* block info */
int reset_block_lengths;
int block_len_bits; /* log2 of current block length */
int next_block_len_bits; /* log2 of next block length */
int prev_block_len_bits; /* log2 of prev block length */
int block_len; /* block length in samples */
int block_num; /* block number in current frame */
int block_pos; /* current position in frame */
uint8_t ms_stereo; /* true if mid/side stereo mode */
uint8_t channel_coded[MAX_CHANNELS]; /* true if channel is coded */
DECLARE_ALIGNED_16(float, exponents[MAX_CHANNELS][BLOCK_MAX_SIZE]);
float max_exponent[MAX_CHANNELS];
int16_t coefs1[MAX_CHANNELS][BLOCK_MAX_SIZE];
DECLARE_ALIGNED_16(float, coefs[MAX_CHANNELS][BLOCK_MAX_SIZE]);
DECLARE_ALIGNED_16(FFTSample, output[BLOCK_MAX_SIZE * 2]);
DECLARE_ALIGNED_16(float, window[BLOCK_MAX_SIZE * 2]);
MDCTContext mdct_ctx[BLOCK_NB_SIZES];
float *windows[BLOCK_NB_SIZES];
DECLARE_ALIGNED_16(FFTSample, mdct_tmp[BLOCK_MAX_SIZE]); /* temporary storage for imdct */
/* output buffer for one frame and the last for IMDCT windowing */
DECLARE_ALIGNED_16(float, frame_out[MAX_CHANNELS][BLOCK_MAX_SIZE * 2]);
/* last frame info */
uint8_t last_superframe[MAX_CODED_SUPERFRAME_SIZE + 4]; /* padding added */
int last_bitoffset;
int last_superframe_len;
float noise_table[NOISE_TAB_SIZE];
int noise_index;
float noise_mult; /* XXX: suppress that and integrate it in the noise array */
/* lsp_to_curve tables */
float lsp_cos_table[BLOCK_MAX_SIZE];
float lsp_pow_e_table[256];
float lsp_pow_m_table1[(1 << LSP_POW_BITS)];
float lsp_pow_m_table2[(1 << LSP_POW_BITS)];
DSPContext dsp;
#ifdef TRACE
int frame_count;
#endif
} WMADecodeContext;
extern const uint16_t ff_wma_hgain_huffcodes[37];
extern const uint8_t ff_wma_hgain_huffbits[37];
extern const float ff_wma_lsp_codebook[NB_LSP_COEFS][16];
extern const uint32_t ff_wma_scale_huffcodes[121];
extern const uint8_t ff_wma_scale_huffbits[121];
int ff_wma_init(AVCodecContext * avctx, int flags2);
int ff_wma_total_gain_to_bits(int total_gain);
int ff_wma_end(AVCodecContext *avctx);
#endif

22
libavcodec/wmadata.h
View File

@ -50,7 +50,7 @@ static const uint8_t exponent_band_44100[3][25] = {
{ 17, 4, 8, 8, 4, 12, 12, 8, 8, 24, 16, 20, 24, 32, 40, 60, 80, 152, },
};
static const uint16_t hgain_huffcodes[37] = {
const uint16_t ff_wma_hgain_huffcodes[37] = {
0x00003, 0x002e7, 0x00001, 0x005cd, 0x0005d, 0x005c9, 0x0005e, 0x00003,
0x00016, 0x0000b, 0x00001, 0x00006, 0x00001, 0x00006, 0x00004, 0x00005,
0x00004, 0x00007, 0x00003, 0x00007, 0x00004, 0x0000a, 0x0000a, 0x00002,
@ -58,7 +58,7 @@ static const uint16_t hgain_huffcodes[37] = {
0x005c8, 0x000b8, 0x005ca, 0x005cb, 0x005cc,
};
static const uint8_t hgain_huffbits[37] = {
const uint8_t ff_wma_hgain_huffbits[37] = {
10, 12, 10, 13, 9, 13, 9, 8,
7, 5, 5, 4, 4, 3, 3, 3,
4, 3, 4, 4, 5, 5, 6, 8,
@ -66,7 +66,7 @@ static const uint8_t hgain_huffbits[37] = {
13, 10, 13, 13, 13,
};
static const float lsp_codebook[NB_LSP_COEFS][16] = {
const float ff_wma_lsp_codebook[NB_LSP_COEFS][16] = {
{ 1.98732877, 1.97944528, 1.97179088, 1.96260549, 1.95038374, 1.93336114, 1.90719232, 1.86191415, },
{ 1.97260000, 1.96083160, 1.94982586, 1.93806164, 1.92516608, 1.91010199, 1.89232331, 1.87149812,
1.84564818, 1.81358067, 1.77620070, 1.73265264, 1.67907855, 1.60959081, 1.50829650, 1.33120330, },
@ -86,7 +86,7 @@ static const float lsp_codebook[NB_LSP_COEFS][16] = {
{ -1.56144989, -1.65944032, -1.72689685, -1.77857740, -1.82203011, -1.86220079, -1.90283983, -1.94820479, },
};
static const uint32_t scale_huffcodes[121] = {
const uint32_t ff_wma_scale_huffcodes[121] = {
0x3ffe8, 0x3ffe6, 0x3ffe7, 0x3ffe5, 0x7fff5, 0x7fff1, 0x7ffed, 0x7fff6,
0x7ffee, 0x7ffef, 0x7fff0, 0x7fffc, 0x7fffd, 0x7ffff, 0x7fffe, 0x7fff7,
0x7fff8, 0x7fffb, 0x7fff9, 0x3ffe4, 0x7fffa, 0x3ffe3, 0x1ffef, 0x1fff0,
@ -105,7 +105,7 @@ static const uint32_t scale_huffcodes[121] = {
0x7fff3,
};
static const uint8_t scale_huffbits[121] = {
const uint8_t ff_wma_scale_huffbits[121] = {
18, 18, 18, 18, 19, 19, 19, 19,
19, 19, 19, 19, 19, 19, 19, 19,
19, 19, 19, 18, 19, 18, 17, 17,
@ -1413,21 +1413,21 @@ static const uint16_t levels5[40] = {
static const CoefVLCTable coef_vlcs[6] = {
{
sizeof(coef0_huffbits), coef0_huffcodes, coef0_huffbits, levels0,
sizeof(coef0_huffbits), sizeof(levels0)/2, coef0_huffcodes, coef0_huffbits, levels0,
},
{
sizeof(coef1_huffbits), coef1_huffcodes, coef1_huffbits, levels1,
sizeof(coef1_huffbits), sizeof(levels1)/2, coef1_huffcodes, coef1_huffbits, levels1,
},
{
sizeof(coef2_huffbits), coef2_huffcodes, coef2_huffbits, levels2,
sizeof(coef2_huffbits), sizeof(levels2)/2, coef2_huffcodes, coef2_huffbits, levels2,
},
{
sizeof(coef3_huffbits), coef3_huffcodes, coef3_huffbits, levels3,
sizeof(coef3_huffbits), sizeof(levels3)/2, coef3_huffcodes, coef3_huffbits, levels3,
},
{
sizeof(coef4_huffbits), coef4_huffcodes, coef4_huffbits, levels4,
sizeof(coef4_huffbits), sizeof(levels4)/2, coef4_huffcodes, coef4_huffbits, levels4,
},
{
sizeof(coef5_huffbits), coef5_huffcodes, coef5_huffbits, levels5,
sizeof(coef5_huffbits), sizeof(levels5)/2, coef5_huffcodes, coef5_huffbits, levels5,
},
};

490
libavcodec/wmadec.c
View File

@ -34,32 +34,10 @@
*/
#include "avcodec.h"
#include "bitstream.h"
#include "dsputil.h"
#include "wma.h"
/* size of blocks */
#define BLOCK_MIN_BITS 7
#define BLOCK_MAX_BITS 11
#define BLOCK_MAX_SIZE (1 << BLOCK_MAX_BITS)
#define BLOCK_NB_SIZES (BLOCK_MAX_BITS - BLOCK_MIN_BITS + 1)
/* XXX: find exact max size */
#define HIGH_BAND_MAX_SIZE 16
#define NB_LSP_COEFS 10
/* XXX: is it a suitable value ? */
#define MAX_CODED_SUPERFRAME_SIZE 16384
#define MAX_CHANNELS 2
#define NOISE_TAB_SIZE 8192
#define LSP_POW_BITS 7
#define VLCBITS 9
#define VLCMAX ((22+VLCBITS-1)/VLCBITS)
#undef NDEBUG
#include <assert.h>
#define EXPVLCBITS 8
#define EXPMAX ((19+EXPVLCBITS-1)/EXPVLCBITS)
@ -67,91 +45,8 @@
#define HGAINVLCBITS 9
#define HGAINMAX ((13+HGAINVLCBITS-1)/HGAINVLCBITS)
typedef struct WMADecodeContext {
GetBitContext gb;
int sample_rate;
int nb_channels;
int bit_rate;
int version; /* 1 = 0x160 (WMAV1), 2 = 0x161 (WMAV2) */
int block_align;
int use_bit_reservoir;
int use_variable_block_len;
int use_exp_vlc; /* exponent coding: 0 = lsp, 1 = vlc + delta */
int use_noise_coding; /* true if perceptual noise is added */
int byte_offset_bits;
VLC exp_vlc;
int exponent_sizes[BLOCK_NB_SIZES];
uint16_t exponent_bands[BLOCK_NB_SIZES][25];
int high_band_start[BLOCK_NB_SIZES]; /* index of first coef in high band */
int coefs_start; /* first coded coef */
int coefs_end[BLOCK_NB_SIZES]; /* max number of coded coefficients */
int exponent_high_sizes[BLOCK_NB_SIZES];
int exponent_high_bands[BLOCK_NB_SIZES][HIGH_BAND_MAX_SIZE];
VLC hgain_vlc;
/* coded values in high bands */
int high_band_coded[MAX_CHANNELS][HIGH_BAND_MAX_SIZE];
int high_band_values[MAX_CHANNELS][HIGH_BAND_MAX_SIZE];
/* there are two possible tables for spectral coefficients */
VLC coef_vlc[2];
uint16_t *run_table[2];
uint16_t *level_table[2];
/* frame info */
int frame_len; /* frame length in samples */
int frame_len_bits; /* frame_len = 1 << frame_len_bits */
int nb_block_sizes; /* number of block sizes */
/* block info */
int reset_block_lengths;
int block_len_bits; /* log2 of current block length */
int next_block_len_bits; /* log2 of next block length */
int prev_block_len_bits; /* log2 of prev block length */
int block_len; /* block length in samples */
int block_num; /* block number in current frame */
int block_pos; /* current position in frame */
uint8_t ms_stereo; /* true if mid/side stereo mode */
uint8_t channel_coded[MAX_CHANNELS]; /* true if channel is coded */
DECLARE_ALIGNED_16(float, exponents[MAX_CHANNELS][BLOCK_MAX_SIZE]);
float max_exponent[MAX_CHANNELS];
int16_t coefs1[MAX_CHANNELS][BLOCK_MAX_SIZE];
DECLARE_ALIGNED_16(float, coefs[MAX_CHANNELS][BLOCK_MAX_SIZE]);
DECLARE_ALIGNED_16(FFTSample, output[BLOCK_MAX_SIZE * 2]);
DECLARE_ALIGNED_16(float, window[BLOCK_MAX_SIZE * 2]);
MDCTContext mdct_ctx[BLOCK_NB_SIZES];
float *windows[BLOCK_NB_SIZES];
DECLARE_ALIGNED_16(FFTSample, mdct_tmp[BLOCK_MAX_SIZE]); /* temporary storage for imdct */
/* output buffer for one frame and the last for IMDCT windowing */
DECLARE_ALIGNED_16(float, frame_out[MAX_CHANNELS][BLOCK_MAX_SIZE * 2]);
/* last frame info */
uint8_t last_superframe[MAX_CODED_SUPERFRAME_SIZE + 4]; /* padding added */
int last_bitoffset;
int last_superframe_len;
float noise_table[NOISE_TAB_SIZE];
int noise_index;
float noise_mult; /* XXX: suppress that and integrate it in the noise array */
/* lsp_to_curve tables */
float lsp_cos_table[BLOCK_MAX_SIZE];
float lsp_pow_e_table[256];
float lsp_pow_m_table1[(1 << LSP_POW_BITS)];
float lsp_pow_m_table2[(1 << LSP_POW_BITS)];
DSPContext dsp;
#ifdef TRACE
int frame_count;
#endif
} WMADecodeContext;
typedef struct CoefVLCTable {
int n; /* total number of codes */
const uint32_t *huffcodes; /* VLC bit values */
const uint8_t *huffbits; /* VLC bit size */
const uint16_t *levels; /* table to build run/level tables */
} CoefVLCTable;
static void wma_lsp_to_curve_init(WMADecodeContext *s, int frame_len);
#include "wmadata.h"
#ifdef TRACE
static void dump_shorts(const char *name, const short *tab, int n)
{
@ -184,356 +79,51 @@ static void dump_floats(const char *name, int prec, const float *tab, int n)
}
#endif
/* XXX: use same run/length optimization as mpeg decoders */
static void init_coef_vlc(VLC *vlc,
uint16_t **prun_table, uint16_t **plevel_table,
const CoefVLCTable *vlc_table)
{
int n = vlc_table->n;
const uint8_t *table_bits = vlc_table->huffbits;
const uint32_t *table_codes = vlc_table->huffcodes;
const uint16_t *levels_table = vlc_table->levels;
uint16_t *run_table, *level_table;
const uint16_t *p;
int i, l, j, level;
init_vlc(vlc, VLCBITS, n, table_bits, 1, 1, table_codes, 4, 4, 0);
run_table = av_malloc(n * sizeof(uint16_t));
level_table = av_malloc(n * sizeof(uint16_t));
p = levels_table;
i = 2;
level = 1;
while (i < n) {
l = *p++;
for(j=0;j<l;j++) {
run_table[i] = j;
level_table[i] = level;
i++;
}
level++;
}
*prun_table = run_table;
*plevel_table = level_table;
}
static int wma_decode_init(AVCodecContext * avctx)
{
WMADecodeContext *s = avctx->priv_data;
int i, flags1, flags2;
float *window;
uint8_t *extradata;
float bps1, high_freq;
volatile float bps;
int sample_rate1;
int coef_vlc_table;
s->sample_rate = avctx->sample_rate;
s->nb_channels = avctx->channels;
s->bit_rate = avctx->bit_rate;
s->block_align = avctx->block_align;
dsputil_init(&s->dsp, avctx);
if (avctx->codec->id == CODEC_ID_WMAV1) {
s->version = 1;
} else {
s->version = 2;
}
/* extract flag infos */
flags1 = 0;
flags2 = 0;
extradata = avctx->extradata;
if (s->version == 1 && avctx->extradata_size >= 4) {
if (avctx->codec->id == CODEC_ID_WMAV1 && avctx->extradata_size >= 4) {
flags1 = extradata[0] | (extradata[1] << 8);
flags2 = extradata[2] | (extradata[3] << 8);
} else if (s->version == 2 && avctx->extradata_size >= 6) {
} else if (avctx->codec->id == CODEC_ID_WMAV2 && avctx->extradata_size >= 6) {
flags1 = extradata[0] | (extradata[1] << 8) |
(extradata[2] << 16) | (extradata[3] << 24);
flags2 = extradata[4] | (extradata[5] << 8);
}
for(i=0; i<avctx->extradata_size; i++)
av_log(NULL, AV_LOG_ERROR, "%02X ", extradata[i]);
s->use_exp_vlc = flags2 & 0x0001;
s->use_bit_reservoir = flags2 & 0x0002;
s->use_variable_block_len = flags2 & 0x0004;
/* compute MDCT block size */
if (s->sample_rate <= 16000) {
s->frame_len_bits = 9;
} else if (s->sample_rate <= 22050 ||
(s->sample_rate <= 32000 && s->version == 1)) {
s->frame_len_bits = 10;
} else {
s->frame_len_bits = 11;
}
s->frame_len = 1 << s->frame_len_bits;
if (s->use_variable_block_len) {
int nb_max, nb;
nb = ((flags2 >> 3) & 3) + 1;
if ((s->bit_rate / s->nb_channels) >= 32000)
nb += 2;
nb_max = s->frame_len_bits - BLOCK_MIN_BITS;
if (nb > nb_max)
nb = nb_max;
s->nb_block_sizes = nb + 1;
} else {
s->nb_block_sizes = 1;
}
/* init rate dependant parameters */
s->use_noise_coding = 1;
high_freq = s->sample_rate * 0.5;
/* if version 2, then the rates are normalized */
sample_rate1 = s->sample_rate;
if (s->version == 2) {
if (sample_rate1 >= 44100)
sample_rate1 = 44100;
else if (sample_rate1 >= 22050)
sample_rate1 = 22050;
else if (sample_rate1 >= 16000)
sample_rate1 = 16000;
else if (sample_rate1 >= 11025)
sample_rate1 = 11025;
else if (sample_rate1 >= 8000)
sample_rate1 = 8000;
}
bps = (float)s->bit_rate / (float)(s->nb_channels * s->sample_rate);
s->byte_offset_bits = av_log2((int)(bps * s->frame_len / 8.0 + 0.5)) + 2;
/* compute high frequency value and choose if noise coding should
be activated */
bps1 = bps;
if (s->nb_channels == 2)
bps1 = bps * 1.6;
if (sample_rate1 == 44100) {
if (bps1 >= 0.61)
s->use_noise_coding = 0;
else
high_freq = high_freq * 0.4;
} else if (sample_rate1 == 22050) {
if (bps1 >= 1.16)
s->use_noise_coding = 0;
else if (bps1 >= 0.72)
high_freq = high_freq * 0.7;
else
high_freq = high_freq * 0.6;
} else if (sample_rate1 == 16000) {
if (bps > 0.5)
high_freq = high_freq * 0.5;
else
high_freq = high_freq * 0.3;
} else if (sample_rate1 == 11025) {
high_freq = high_freq * 0.7;
} else if (sample_rate1 == 8000) {
if (bps <= 0.625) {
high_freq = high_freq * 0.5;
} else if (bps > 0.75) {
s->use_noise_coding = 0;
} else {
high_freq = high_freq * 0.65;
}
} else {
if (bps >= 0.8) {
high_freq = high_freq * 0.75;
} else if (bps >= 0.6) {
high_freq = high_freq * 0.6;
} else {
high_freq = high_freq * 0.5;
}
}
dprintf("flags1=0x%x flags2=0x%x\n", flags1, flags2);
dprintf("version=%d channels=%d sample_rate=%d bitrate=%d block_align=%d\n",
s->version, s->nb_channels, s->sample_rate, s->bit_rate,
s->block_align);
dprintf("bps=%f bps1=%f high_freq=%f bitoffset=%d\n",
bps, bps1, high_freq, s->byte_offset_bits);
dprintf("use_noise_coding=%d use_exp_vlc=%d nb_block_sizes=%d\n",
s->use_noise_coding, s->use_exp_vlc, s->nb_block_sizes);
/* compute the scale factor band sizes for each MDCT block size */
{
int a, b, pos, lpos, k, block_len, i, j, n;
const uint8_t *table;
if (s->version == 1) {
s->coefs_start = 3;
} else {
s->coefs_start = 0;
}
for(k = 0; k < s->nb_block_sizes; k++) {
block_len = s->frame_len >> k;
if (s->version == 1) {
lpos = 0;
for(i=0;i<25;i++) {
a = wma_critical_freqs[i];
b = s->sample_rate;
pos = ((block_len * 2 * a) + (b >> 1)) / b;
if (pos > block_len)
pos = block_len;
s->exponent_bands[0][i] = pos - lpos;
if (pos >= block_len) {
i++;
break;
}
lpos = pos;
}
s->exponent_sizes[0] = i;
} else {
/* hardcoded tables */
table = NULL;
a = s->frame_len_bits - BLOCK_MIN_BITS - k;
if (a < 3) {
if (s->sample_rate >= 44100)
table = exponent_band_44100[a];
else if (s->sample_rate >= 32000)
table = exponent_band_32000[a];
else if (s->sample_rate >= 22050)
table = exponent_band_22050[a];
}
if (table) {
n = *table++;
for(i=0;i<n;i++)
s->exponent_bands[k][i] = table[i];
s->exponent_sizes[k] = n;
} else {
j = 0;
lpos = 0;
for(i=0;i<25;i++) {
a = wma_critical_freqs[i];
b = s->sample_rate;
pos = ((block_len * 2 * a) + (b << 1)) / (4 * b);
pos <<= 2;
if (pos > block_len)
pos = block_len;
if (pos > lpos)
s->exponent_bands[k][j++] = pos - lpos;
if (pos >= block_len)
break;
lpos = pos;
}
s->exponent_sizes[k] = j;
}
}
/* max number of coefs */
s->coefs_end[k] = (s->frame_len - ((s->frame_len * 9) / 100)) >> k;
/* high freq computation */
s->high_band_start[k] = (int)((block_len * 2 * high_freq) /
s->sample_rate + 0.5);
n = s->exponent_sizes[k];
j = 0;
pos = 0;
for(i=0;i<n;i++) {
int start, end;
start = pos;
pos += s->exponent_bands[k][i];
end = pos;
if (start < s->high_band_start[k])
start = s->high_band_start[k];
if (end > s->coefs_end[k])
end = s->coefs_end[k];
if (end > start)
s->exponent_high_bands[k][j++] = end - start;
}
s->exponent_high_sizes[k] = j;
#if 0
tprintf("%5d: coefs_end=%d high_band_start=%d nb_high_bands=%d: ",
s->frame_len >> k,
s->coefs_end[k],
s->high_band_start[k],
s->exponent_high_sizes[k]);
for(j=0;j<s->exponent_high_sizes[k];j++)
tprintf(" %d", s->exponent_high_bands[k][j]);
tprintf("\n");
#endif
}
}
#ifdef TRACE
{
int i, j;
for(i = 0; i < s->nb_block_sizes; i++) {
tprintf("%5d: n=%2d:",
s->frame_len >> i,
s->exponent_sizes[i]);
for(j=0;j<s->exponent_sizes[i];j++)
tprintf(" %d", s->exponent_bands[i][j]);
tprintf("\n");
}
}
#endif
ff_wma_init(avctx, flags2);
/* init MDCT */
for(i = 0; i < s->nb_block_sizes; i++)
ff_mdct_init(&s->mdct_ctx[i], s->frame_len_bits - i + 1, 1);
/* init MDCT windows : simple sinus window */
for(i = 0; i < s->nb_block_sizes; i++) {
int n, j;
float alpha;
n = 1 << (s->frame_len_bits - i);
window = av_malloc(sizeof(float) * n);
alpha = M_PI / (2.0 * n);
for(j=0;j<n;j++) {
window[n - j - 1] = sin((j + 0.5) * alpha);
}
s->windows[i] = window;
}
s->reset_block_lengths = 1;
if (s->use_noise_coding) {
/* init the noise generator */
if (s->use_exp_vlc)
s->noise_mult = 0.02;
else
s->noise_mult = 0.04;
#ifdef TRACE
for(i=0;i<NOISE_TAB_SIZE;i++)
s->noise_table[i] = 1.0 * s->noise_mult;
#else
{
unsigned int seed;
float norm;
seed = 1;
norm = (1.0 / (float)(1LL << 31)) * sqrt(3) * s->noise_mult;
for(i=0;i<NOISE_TAB_SIZE;i++) {
seed = seed * 314159 + 1;
s->noise_table[i] = (float)((int)seed) * norm;
}
}
#endif
init_vlc(&s->hgain_vlc, HGAINVLCBITS, sizeof(hgain_huffbits),
hgain_huffbits, 1, 1,
hgain_huffcodes, 2, 2, 0);
init_vlc(&s->hgain_vlc, HGAINVLCBITS, sizeof(ff_wma_hgain_huffbits),
ff_wma_hgain_huffbits, 1, 1,
ff_wma_hgain_huffcodes, 2, 2, 0);
}
if (s->use_exp_vlc) {
init_vlc(&s->exp_vlc, EXPVLCBITS, sizeof(scale_huffbits),
scale_huffbits, 1, 1,
scale_huffcodes, 4, 4, 0);
init_vlc(&s->exp_vlc, EXPVLCBITS, sizeof(ff_wma_scale_huffbits), //FIXME move out of context
ff_wma_scale_huffbits, 1, 1,
ff_wma_scale_huffcodes, 4, 4, 0);
} else {
wma_lsp_to_curve_init(s, s->frame_len);
}
/* choose the VLC tables for the coefficients */
coef_vlc_table = 2;
if (s->sample_rate >= 32000) {
if (bps1 < 0.72)
coef_vlc_table = 0;
else if (bps1 < 1.16)
coef_vlc_table = 1;
}
init_coef_vlc(&s->coef_vlc[0], &s->run_table[0], &s->level_table[0],
&coef_vlcs[coef_vlc_table * 2]);
init_coef_vlc(&s->coef_vlc[1], &s->run_table[1], &s->level_table[1],
&coef_vlcs[coef_vlc_table * 2 + 1]);
return 0;
}
@ -664,7 +254,7 @@ static void decode_exp_lsp(WMADecodeContext *s, int ch)
val = get_bits(&s->gb, 3);
else
val = get_bits(&s->gb, 4);
lsp_coefs[i] = lsp_codebook[i][val];
lsp_coefs[i] = ff_wma_lsp_codebook[i][val];
}
wma_lsp_to_curve(s, s->exponents[ch], &s->max_exponent[ch],
@ -692,8 +282,9 @@ static int decode_exp_vlc(WMADecodeContext *s, int ch)
do {
*q++ = v;
} while (--n);
}
last_exp = 36;
}else
last_exp = 36;
while (q < q_end) {
code = get_vlc2(&s->gb, s->exp_vlc.table, EXPVLCBITS, EXPMAX);
if (code < 0)
@ -787,16 +378,7 @@ static int wma_decode_block(WMADecodeContext *s)
break;
}
if (total_gain < 15)
coef_nb_bits = 13;
else if (total_gain < 32)
coef_nb_bits = 12;
else if (total_gain < 40)
coef_nb_bits = 11;
else if (total_gain < 45)
coef_nb_bits = 10;
else
coef_nb_bits = 9;
coef_nb_bits= ff_wma_total_gain_to_bits(total_gain);
/* compute number of coefficients */
n = s->coefs_end[bsize] - s->coefs_start;
@ -1279,6 +861,9 @@ static int wma_decode_superframe(AVCodecContext *avctx,
goto fail;
samples += s->nb_channels * s->frame_len;
}
//av_log(NULL, AV_LOG_ERROR, "%d %d %d %d outbytes:%d eaten:%d\n", s->frame_len_bits, s->block_len_bits, s->frame_len, s->block_len, (int8_t *)samples - (int8_t *)data, s->block_align);
*data_size = (int8_t *)samples - (int8_t *)data;
return s->block_align;
fail:
@ -1287,31 +872,6 @@ static int wma_decode_superframe(AVCodecContext *avctx,
return -1;
}
static int wma_decode_end(AVCodecContext *avctx)
{
WMADecodeContext *s = avctx->priv_data;
int i;
for(i = 0; i < s->nb_block_sizes; i++)
ff_mdct_end(&s->mdct_ctx[i]);
for(i = 0; i < s->nb_block_sizes; i++)
av_free(s->windows[i]);
if (s->use_exp_vlc) {
free_vlc(&s->exp_vlc);
}
if (s->use_noise_coding) {
free_vlc(&s->hgain_vlc);
}
for(i = 0;i < 2; i++) {
free_vlc(&s->coef_vlc[i]);
av_free(s->run_table[i]);
av_free(s->level_table[i]);
}
return 0;
}
AVCodec wmav1_decoder =
{
"wmav1",
@ -1320,7 +880,7 @@ AVCodec wmav1_decoder =
sizeof(WMADecodeContext),
wma_decode_init,
NULL,
wma_decode_end,
ff_wma_end,
wma_decode_superframe,
};
@ -1332,6 +892,6 @@ AVCodec wmav2_decoder =
sizeof(WMADecodeContext),
wma_decode_init,
NULL,
wma_decode_end,
ff_wma_end,
wma_decode_superframe,
};

402
libavcodec/wmaenc.c Normal file
View File

@ -0,0 +1,402 @@
/*
* WMA compatible encoder
* Copyright (c) 2007 Michael Niedermayer
*
* 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 "avcodec.h"
#include "wma.h"
#undef NDEBUG
#include <assert.h>
static int encode_init(AVCodecContext * avctx){
WMADecodeContext *s = avctx->priv_data;
int i, flags1, flags2;
uint8_t *extradata;
if(avctx->channels > MAX_CHANNELS)
return -1;
/* extract flag infos */
flags1 = 0;
flags2 = 1;
if (avctx->codec->id == CODEC_ID_WMAV1) {
extradata= av_malloc(4);
avctx->extradata_size= 4;
extradata[0] = flags1;
extradata[1] = flags1>>8;
extradata[2] = flags2;
extradata[3] = flags2>>8;
} else if (avctx->codec->id == CODEC_ID_WMAV2) {
extradata= av_mallocz(10);
avctx->extradata_size= 10;
extradata[0] = flags1;
extradata[1] = flags1>>8;
extradata[2] = flags1>>16;
extradata[3] = flags1>>24;
extradata[4] = flags2;
extradata[5] = flags2>>8;
}else
assert(0);
avctx->extradata= extradata;
s->use_exp_vlc = flags2 & 0x0001;
s->use_bit_reservoir = flags2 & 0x0002;
s->use_variable_block_len = flags2 & 0x0004;
ff_wma_init(avctx, flags2);
/* init MDCT */
for(i = 0; i < s->nb_block_sizes; i++)
ff_mdct_init(&s->mdct_ctx[i], s->frame_len_bits - i + 1, 0);
avctx->block_align=
s->block_align= avctx->bit_rate*(int64_t)s->frame_len / (avctx->sample_rate*8);
//av_log(NULL, AV_LOG_ERROR, "%d %d %d %d\n", s->block_align, avctx->bit_rate, s->frame_len, avctx->sample_rate);
avctx->frame_size= s->frame_len;
return 0;
}
static void apply_window_and_mdct(AVCodecContext * avctx, signed short * audio, int len) {
WMADecodeContext *s = avctx->priv_data;
int window_index= s->frame_len_bits - s->block_len_bits;
int i, j, channel;
const float * win = s->windows[window_index];
int window_len = 1 << s->block_len_bits;
float n = window_len/2;
for (channel = 0; channel < avctx->channels; channel++) {
memcpy(s->output, s->frame_out[channel], sizeof(float)*window_len);
j = channel;
for (i = 0; i < len; i++, j += avctx->channels){
s->output[i+window_len] = audio[j] / n * win[i];
s->frame_out[channel][i] = audio[j] / n * win[window_len - i - 1];
}
ff_mdct_calc(&s->mdct_ctx[window_index], s->coefs[channel], s->output, s->mdct_tmp);
}
}
//FIXME use for decoding too
static void init_exp(WMADecodeContext *s, int ch, int *exp_param){
int n;
const uint16_t *ptr;
float v, *q, max_scale, *q_end;
ptr = s->exponent_bands[s->frame_len_bits - s->block_len_bits];
q = s->exponents[ch];
q_end = q + s->block_len;
max_scale = 0;
while (q < q_end) {
/* XXX: use a table */
v = pow(10, *exp_param++ * (1.0 / 16.0));
max_scale= FFMAX(max_scale, v);
n = *ptr++;
do {
*q++ = v;
} while (--n);
}
s->max_exponent[ch] = max_scale;
}
static void encode_exp_vlc(WMADecodeContext *s, int ch, const int *exp_param){
int last_exp;
const uint16_t *ptr;
float *q, *q_end;
ptr = s->exponent_bands[s->frame_len_bits - s->block_len_bits];
q = s->exponents[ch];
q_end = q + s->block_len;
if (s->version == 1) {
last_exp= *exp_param++;
assert(last_exp-10 >= 0 && last_exp-10 < 32);
put_bits(&s->pb, 5, last_exp - 10);
q+= *ptr++;
}else
last_exp = 36;
while (q < q_end) {
int exp = *exp_param++;
int code = exp - last_exp + 60;
assert(code >= 0 && code < 120);
put_bits(&s->pb, ff_wma_scale_huffbits[code], ff_wma_scale_huffcodes[code]);
/* XXX: use a table */
q+= *ptr++;
last_exp= exp;
}
}
static int encode_block(WMADecodeContext *s, float (*src_coefs)[BLOCK_MAX_SIZE], int total_gain){
int v, bsize, ch, coef_nb_bits, parse_exponents;
float mdct_norm;
int nb_coefs[MAX_CHANNELS];
static const int fixed_exp[25]={20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20};
//FIXME remove duplication relative to decoder
if (s->use_variable_block_len) {
assert(0); //FIXME not implemented
}else{
/* fixed block len */
s->next_block_len_bits = s->frame_len_bits;
s->prev_block_len_bits = s->frame_len_bits;
s->block_len_bits = s->frame_len_bits;
}
s->block_len = 1 << s->block_len_bits;
// assert((s->block_pos + s->block_len) <= s->frame_len);
bsize = s->frame_len_bits - s->block_len_bits;
//FIXME factor
v = s->coefs_end[bsize] - s->coefs_start;
for(ch = 0; ch < s->nb_channels; ch++)
nb_coefs[ch] = v;
{
int n4 = s->block_len / 2;
mdct_norm = 1.0 / (float)n4;
if (s->version == 1) {
mdct_norm *= sqrt(n4);
}
}
if (s->nb_channels == 2) {
put_bits(&s->pb, 1, s->ms_stereo= 1);
}
for(ch = 0; ch < s->nb_channels; ch++) {
if (s->channel_coded[ch]) {
init_exp(s, ch, fixed_exp);
}
}
for(ch = 0; ch < s->nb_channels; ch++) {
if (s->channel_coded[ch]) {
int16_t *coefs1;
float *coefs, *exponents, mult;
int i, n;
coefs1 = s->coefs1[ch];
exponents = s->exponents[ch];
mult = pow(10, total_gain * 0.05) / s->max_exponent[ch];
mult *= mdct_norm;
coefs = src_coefs[ch];
if (s->use_noise_coding && 0) {
assert(0); //FIXME not implemented
} else {
coefs += s->coefs_start;
n = nb_coefs[ch];
for(i = 0;i < n; i++){
double t= *coefs++ / (exponents[i] * mult);
if(t<-32768 || t>32767)
return -1;
coefs1[i] = lrint(t);
}
}
}
}
v = 0;
for(ch = 0; ch < s->nb_channels; ch++) {
int a = s->channel_coded[ch]=1; //FIXME
put_bits(&s->pb, 1, a);
v |= a;
}
if (!v)
return 1;
for(v= total_gain-1; v>=127; v-= 127)
put_bits(&s->pb, 7, 127);
put_bits(&s->pb, 7, v);
coef_nb_bits= ff_wma_total_gain_to_bits(total_gain);
if (s->use_noise_coding) {
for(ch = 0; ch < s->nb_channels; ch++) {
if (s->channel_coded[ch]) {
int i, n;
n = s->exponent_high_sizes[bsize];
for(i=0;i<n;i++) {
put_bits(&s->pb, 1, s->high_band_coded[ch][i]= 0);
if (0)
nb_coefs[ch] -= s->exponent_high_bands[bsize][i];
}
}
}
}
parse_exponents = 1;
if (s->block_len_bits != s->frame_len_bits) {
put_bits(&s->pb, 1, parse_exponents);
}
if (parse_exponents) {
for(ch = 0; ch < s->nb_channels; ch++) {
if (s->channel_coded[ch]) {
if (s->use_exp_vlc) {
encode_exp_vlc(s, ch, fixed_exp);
} else {
assert(0); //FIXME not implemented
// encode_exp_lsp(s, ch);
}
}
}
} else {
assert(0); //FIXME not implemented
}
for(ch = 0; ch < s->nb_channels; ch++) {
if (s->channel_coded[ch]) {
int run, tindex;
int16_t *ptr, *eptr;
tindex = (ch == 1 && s->ms_stereo);
ptr = &s->coefs1[ch][0];
eptr = ptr + nb_coefs[ch];
run=0;
for(;ptr < eptr; ptr++){
if(*ptr){
int level= *ptr;
int abs_level= FFABS(level);
int code= 0;
if(abs_level <= s->coef_vlcs[tindex]->max_level){
if(run < s->coef_vlcs[tindex]->levels[abs_level-1])
code= run + s->int_table[tindex][abs_level-1];
}
assert(code < s->coef_vlcs[tindex]->n);
put_bits(&s->pb, s->coef_vlcs[tindex]->huffbits[code], s->coef_vlcs[tindex]->huffcodes[code]);
if(code == 0){
if(1<<coef_nb_bits <= abs_level)
return -1;
put_bits(&s->pb, coef_nb_bits, abs_level);
put_bits(&s->pb, s->frame_len_bits, run);
}
put_bits(&s->pb, 1, level > 0);
run=0;
}else{
run++;
}
}
if(run)
put_bits(&s->pb, s->coef_vlcs[tindex]->huffbits[1], s->coef_vlcs[tindex]->huffcodes[1]);
}
if (s->version == 1 && s->nb_channels >= 2) {
align_put_bits(&s->pb);
}
}
return 0;
}
static int encode_frame(WMADecodeContext *s, float (*src_coefs)[BLOCK_MAX_SIZE], uint8_t *buf, int buf_size, int total_gain){
init_put_bits(&s->pb, buf, buf_size);
if (s->use_bit_reservoir) {
assert(0);//FIXME not implemented
}else{
if(encode_block(s, src_coefs, total_gain) < 0)
return INT_MAX;
}
align_put_bits(&s->pb);
return put_bits_count(&s->pb)/8 - s->block_align;
}
static int encode_superframe(AVCodecContext *avctx,
unsigned char *buf, int buf_size, void *data){
WMADecodeContext *s = avctx->priv_data;
short *samples = data;
int i, total_gain, best;
s->block_len_bits= s->frame_len_bits; //required by non variable block len
s->block_len = 1 << s->block_len_bits;
apply_window_and_mdct(avctx, samples, avctx->frame_size);
if (s->ms_stereo) {
float a, b;
int i;
for(i = 0; i < s->block_len; i++) {
a = s->coefs[0][i]*0.5;
b = s->coefs[1][i]*0.5;
s->coefs[0][i] = a + b;
s->coefs[1][i] = a - b;
}
}
#if 1
total_gain= 128;
for(i=64; i; i>>=1){
int error= encode_frame(s, s->coefs, buf, buf_size, total_gain-i);
if(error<0)
total_gain-= i;
}
#else
total_gain= 90;
best= encode_frame(s, s->coefs, buf, buf_size, total_gain);
for(i=32; i; i>>=1){
int scoreL= encode_frame(s, s->coefs, buf, buf_size, total_gain-i);
int scoreR= encode_frame(s, s->coefs, buf, buf_size, total_gain+i);
av_log(NULL, AV_LOG_ERROR, "%d %d %d (%d)\n", scoreL, best, scoreR, total_gain);
if(scoreL < FFMIN(best, scoreR)){
best = scoreL;
total_gain -= i;
}else if(scoreR < best){
best = scoreR;
total_gain += i;
}
}
#endif
encode_frame(s, s->coefs, buf, buf_size, total_gain);
assert((put_bits_count(&s->pb) & 7) == 0);
i= s->block_align - (put_bits_count(&s->pb)+7)/8;
assert(i>=0);
while(i--)
put_bits(&s->pb, 8, 'N');
flush_put_bits(&s->pb);
return pbBufPtr(&s->pb) - s->pb.buf;
}
AVCodec wmav1_encoder =
{
"wmav1",
CODEC_TYPE_AUDIO,
CODEC_ID_WMAV1,
sizeof(WMADecodeContext),
encode_init,
encode_superframe,
ff_wma_end,
};
AVCodec wmav2_encoder =
{
"wmav2",
CODEC_TYPE_AUDIO,
CODEC_ID_WMAV2,
sizeof(WMADecodeContext),
encode_init,
encode_superframe,
ff_wma_end,
};