mirror of
https://gitee.com/openharmony/third_party_ffmpeg
synced 2024-11-24 11:49:48 +00:00
385 lines
12 KiB
C
385 lines
12 KiB
C
/*
|
|
* 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)
|
|
{
|
|
WMACodecContext *s = avctx->priv_data;
|
|
int i;
|
|
float bps1, high_freq;
|
|
volatile float bps;
|
|
int sample_rate1;
|
|
int coef_vlc_table;
|
|
|
|
if( avctx->sample_rate<=0 || avctx->sample_rate>50000
|
|
|| avctx->channels<=0 || avctx->channels>8
|
|
|| avctx->bit_rate<=0)
|
|
return -1;
|
|
|
|
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 dependent 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(s->avctx, "flags2=0x%x\n", flags2);
|
|
dprintf(s->avctx, "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(s->avctx, "bps=%f bps1=%f high_freq=%f bitoffset=%d\n",
|
|
bps, bps1, high_freq, s->byte_offset_bits);
|
|
dprintf(s->avctx, "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(s->avctx, "%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(s->avctx, " %d", s->exponent_high_bands[k][j]);
|
|
tprintf(s->avctx, "\n");
|
|
#endif
|
|
}
|
|
}
|
|
|
|
#ifdef TRACE
|
|
{
|
|
int i, j;
|
|
for(i = 0; i < s->nb_block_sizes; i++) {
|
|
tprintf(s->avctx, "%5d: n=%2d:",
|
|
s->frame_len >> i,
|
|
s->exponent_sizes[i]);
|
|
for(j=0;j<s->exponent_sizes[i];j++)
|
|
tprintf(s->avctx, " %d", s->exponent_bands[i][j]);
|
|
tprintf(s->avctx, "\n");
|
|
}
|
|
}
|
|
#endif
|
|
|
|
/* init MDCT windows : simple sinus window */
|
|
for(i = 0; i < s->nb_block_sizes; i++) {
|
|
int n;
|
|
n = 1 << (s->frame_len_bits - i);
|
|
ff_sine_window_init(ff_sine_windows[s->frame_len_bits - i - 7], n);
|
|
s->windows[i] = ff_sine_windows[s->frame_len_bits - i - 7];
|
|
}
|
|
|
|
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)
|
|
{
|
|
WMACodecContext *s = avctx->priv_data;
|
|
int i;
|
|
|
|
for(i = 0; i < s->nb_block_sizes; i++)
|
|
ff_mdct_end(&s->mdct_ctx[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]);
|
|
av_free(s->int_table[i]);
|
|
}
|
|
|
|
return 0;
|
|
}
|