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store cpl_in_use for all blocks in decode context

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Originally committed as revision 13703 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Justin Ruggles 2008-06-07 22:30:43 +00:00
parent be594ae4b4
commit 54624396fc
2 changed files with 19 additions and 14 deletions
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30
libavcodec/ac3dec.c
View File

@ -711,6 +711,7 @@ static int ac3_parse_audio_block(AC3DecodeContext *s, int blk)
int i, bnd, seg, ch;
int different_transforms;
int downmix_output;
int cpl_in_use;
GetBitContext *gbc = &s->gbc;
uint8_t bit_alloc_stages[AC3_MAX_CHANNELS];
@ -746,8 +747,8 @@ static int ac3_parse_audio_block(AC3DecodeContext *s, int blk)
/* coupling strategy */
if (get_bits1(gbc)) {
memset(bit_alloc_stages, 3, AC3_MAX_CHANNELS);
s->cpl_in_use = get_bits1(gbc);
if (s->cpl_in_use) {
cpl_in_use = get_bits1(gbc);
if (cpl_in_use) {
/* coupling in use */
int cpl_begin_freq, cpl_end_freq;
@ -789,10 +790,13 @@ static int ac3_parse_audio_block(AC3DecodeContext *s, int blk)
} else if (!blk) {
av_log(s->avctx, AV_LOG_ERROR, "new coupling strategy must be present in block 0\n");
return -1;
} else {
cpl_in_use = s->cpl_in_use[blk-1];
}
s->cpl_in_use[blk] = cpl_in_use;
/* coupling coordinates */
if (s->cpl_in_use) {
if (cpl_in_use) {
int cpl_coords_exist = 0;
for (ch = 1; ch <= fbw_channels; ch++) {
@ -828,7 +832,7 @@ static int ac3_parse_audio_block(AC3DecodeContext *s, int blk)
if (channel_mode == AC3_CHMODE_STEREO) {
if (get_bits1(gbc)) {
s->num_rematrixing_bands = 4;
if(s->cpl_in_use && s->start_freq[CPL_CH] <= 61)
if(cpl_in_use && s->start_freq[CPL_CH] <= 61)
s->num_rematrixing_bands -= 1 + (s->start_freq[CPL_CH] == 37);
for(bnd=0; bnd<s->num_rematrixing_bands; bnd++)
s->rematrixing_flags[bnd] = get_bits1(gbc);
@ -841,7 +845,7 @@ static int ac3_parse_audio_block(AC3DecodeContext *s, int blk)
/* exponent strategies for each channel */
s->exp_strategy[CPL_CH] = EXP_REUSE;
s->exp_strategy[s->lfe_ch] = EXP_REUSE;
for (ch = !s->cpl_in_use; ch <= s->channels; ch++) {
for (ch = !cpl_in_use; ch <= s->channels; ch++) {
s->exp_strategy[ch] = get_bits(gbc, 2 - (ch == s->lfe_ch));
if(s->exp_strategy[ch] != EXP_REUSE)
bit_alloc_stages[ch] = 3;
@ -869,13 +873,13 @@ static int ac3_parse_audio_block(AC3DecodeContext *s, int blk)
memset(bit_alloc_stages, 3, AC3_MAX_CHANNELS);
}
}
if (s->cpl_in_use && s->exp_strategy[CPL_CH] != EXP_REUSE) {
if (cpl_in_use && s->exp_strategy[CPL_CH] != EXP_REUSE) {
s->num_exp_groups[CPL_CH] = (s->end_freq[CPL_CH] - s->start_freq[CPL_CH]) /
(3 << (s->exp_strategy[CPL_CH] - 1));
}
/* decode exponents for each channel */
for (ch = !s->cpl_in_use; ch <= s->channels; ch++) {
for (ch = !cpl_in_use; ch <= s->channels; ch++) {
if (s->exp_strategy[ch] != EXP_REUSE) {
s->dexps[ch][0] = get_bits(gbc, 4) << !ch;
decode_exponents(gbc, s->exp_strategy[ch],
@ -893,7 +897,7 @@ static int ac3_parse_audio_block(AC3DecodeContext *s, int blk)
s->bit_alloc_params.slow_gain = ff_ac3_slow_gain_tab[get_bits(gbc, 2)];
s->bit_alloc_params.db_per_bit = ff_ac3_db_per_bit_tab[get_bits(gbc, 2)];
s->bit_alloc_params.floor = ff_ac3_floor_tab[get_bits(gbc, 3)];
for(ch=!s->cpl_in_use; ch<=s->channels; ch++)
for(ch=!cpl_in_use; ch<=s->channels; ch++)
bit_alloc_stages[ch] = FFMAX(bit_alloc_stages[ch], 2);
} else if (!blk) {
av_log(s->avctx, AV_LOG_ERROR, "new bit allocation info must be present in block 0\n");
@ -904,7 +908,7 @@ static int ac3_parse_audio_block(AC3DecodeContext *s, int blk)
if (get_bits1(gbc)) {
int csnr;
csnr = (get_bits(gbc, 6) - 15) << 4;
for (ch = !s->cpl_in_use; ch <= s->channels; ch++) { /* snr offset and fast gain */
for (ch = !cpl_in_use; ch <= s->channels; ch++) { /* snr offset and fast gain */
s->snr_offset[ch] = (csnr + get_bits(gbc, 4)) << 2;
s->fast_gain[ch] = ff_ac3_fast_gain_tab[get_bits(gbc, 3)];
}
@ -915,7 +919,7 @@ static int ac3_parse_audio_block(AC3DecodeContext *s, int blk)
}
/* coupling leak information */
if (s->cpl_in_use) {
if (cpl_in_use) {
if (get_bits1(gbc)) {
s->bit_alloc_params.cpl_fast_leak = get_bits(gbc, 3);
s->bit_alloc_params.cpl_slow_leak = get_bits(gbc, 3);
@ -929,7 +933,7 @@ static int ac3_parse_audio_block(AC3DecodeContext *s, int blk)
/* delta bit allocation information */
if (get_bits1(gbc)) {
/* delta bit allocation exists (strategy) */
for (ch = !s->cpl_in_use; ch <= fbw_channels; ch++) {
for (ch = !cpl_in_use; ch <= fbw_channels; ch++) {
s->dba_mode[ch] = get_bits(gbc, 2);
if (s->dba_mode[ch] == DBA_RESERVED) {
av_log(s->avctx, AV_LOG_ERROR, "delta bit allocation strategy reserved\n");
@ -938,7 +942,7 @@ static int ac3_parse_audio_block(AC3DecodeContext *s, int blk)
bit_alloc_stages[ch] = FFMAX(bit_alloc_stages[ch], 2);
}
/* channel delta offset, len and bit allocation */
for (ch = !s->cpl_in_use; ch <= fbw_channels; ch++) {
for (ch = !cpl_in_use; ch <= fbw_channels; ch++) {
if (s->dba_mode[ch] == DBA_NEW) {
s->dba_nsegs[ch] = get_bits(gbc, 3);
for (seg = 0; seg <= s->dba_nsegs[ch]; seg++) {
@ -957,7 +961,7 @@ static int ac3_parse_audio_block(AC3DecodeContext *s, int blk)
}
/* Bit allocation */
for(ch=!s->cpl_in_use; ch<=s->channels; ch++) {
for(ch=!cpl_in_use; ch<=s->channels; ch++) {
if(bit_alloc_stages[ch] > 2) {
/* Exponent mapping into PSD and PSD integration */
ff_ac3_bit_alloc_calc_psd(s->dexps[ch],

3
libavcodec/ac3dec.h
View File

@ -42,6 +42,7 @@
#define AC3_MAX_COEFS 256
#define AC3_BLOCK_SIZE 256
#define MAX_BLOCKS 6
typedef struct {
AVCodecContext *avctx; ///< parent context
@ -63,7 +64,7 @@ typedef struct {
///@}
///@defgroup cpl standard coupling
int cpl_in_use; ///< coupling in use (cplinu)
int cpl_in_use[MAX_BLOCKS]; ///< coupling in use (cplinu)
int channel_in_cpl[AC3_MAX_CHANNELS]; ///< channel in coupling (chincpl)
int phase_flags_in_use; ///< phase flags in use (phsflginu)
int phase_flags[18]; ///< phase flags (phsflg)