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-rw-r--r--libavcodec/ac3dec.c109
1 files changed, 13 insertions, 96 deletions
diff --git a/libavcodec/ac3dec.c b/libavcodec/ac3dec.c
index 99c8694b7f..3e8b0b5afc 100644
--- a/libavcodec/ac3dec.c
+++ b/libavcodec/ac3dec.c
@@ -749,8 +749,8 @@ static void decode_band_structure(GetBitContext *gbc, int blk, int eac3,
/* calculate number of bands and band sizes based on band structure.
note that the first 4 subbands in enhanced coupling span only 6 bins
instead of 12. */
- n_bands = n_subbands;
if (num_bands || band_sizes ) {
+ n_bands = n_subbands;
bnd_sz[0] = ecpl ? 6 : 12;
for (bnd = 0, subbnd = 1; subbnd < n_subbands; subbnd++) {
int subbnd_size = (ecpl && subbnd < 4) ? 6 : 12;
@@ -818,86 +818,14 @@ static int decode_audio_block(AC3DecodeContext *s, int blk)
/* spectral extension strategy */
if (s->eac3 && (!blk || get_bits1(gbc))) {
- s->spx_in_use[blk] = get_bits1(gbc);
- if (s->spx_in_use[blk]) {
- int begf, endf;
- int spx_end_subband;
-
- /* determine which channels use spx */
- if (s->channel_mode == AC3_CHMODE_MONO) {
- s->channel_in_spx[1] = 1;
- s->spx_coords_exist[1] = 0;
- } else {
- for (ch = 1; ch <= fbw_channels; ch++) {
- s->channel_in_spx[ch] = get_bits1(gbc);
- s->spx_coords_exist[ch] = 0;
- }
- }
-
- s->spx_copy_start_freq = get_bits(gbc, 2) * 12 + 25;
- begf = get_bits(gbc, 3);
- endf = get_bits(gbc, 3);
- s->spx_start_subband = begf < 6 ? begf+2 : 2*begf-3;
- spx_end_subband = endf < 4 ? endf+5 : 2*endf+3;
- s->num_spx_subbands = spx_end_subband - s->spx_start_subband;
- s->spx_start_freq = s->spx_start_subband * 12 + 25;
- s->spx_end_freq = spx_end_subband * 12 + 25;
-
- decode_band_structure(gbc, blk, s->eac3, 0,
- s->spx_start_subband, spx_end_subband,
- ff_eac3_default_spx_band_struct,
- s->spx_band_struct, NULL, &s->num_spx_bands,
- s->spx_band_sizes);
- } else {
- for (ch = 1; ch <= fbw_channels; ch++) {
- s->channel_in_spx[ch] = 0;
- s->first_spx_coords[ch] = 1;
- }
+ if (get_bits1(gbc)) {
+ av_log_missing_feature(s->avctx, "Spectral extension", 1);
+ return -1;
}
- } else {
- s->spx_in_use[blk] = blk ? s->spx_in_use[blk-1] : 0;
+ /* TODO: parse spectral extension strategy info */
}
- /* spectral extension coordinates */
- if (s->spx_in_use[blk]) {
- for (ch = 1; ch <= fbw_channels; ch++) {
- if (s->channel_in_spx[ch]) {
- if (s->first_spx_coords[ch] || get_bits1(gbc)) {
- int bin, spx_blend;
- int master_spx_coord;
- s->first_spx_coords[ch] = 0;
- s->spx_coords_exist[ch] = 1;
- spx_blend = get_bits(gbc, 5) << 18;
- master_spx_coord = get_bits(gbc, 2) * 3;
- bin = s->spx_start_freq;
- for (bnd = 0; bnd < s->num_spx_bands; bnd++) {
- int spx_coord_exp, spx_coord_mant;
-
- /* calculate blending factors */
- int bandsize = s->spx_band_sizes[bnd];
- int nratio = (((bin + (bandsize >> 1)) << 23) / s->spx_end_freq) - spx_blend;
- nratio = av_clip(nratio, 0, INT24_MAX);
- s->spx_noise_blend [ch][bnd] = ff_sqrt(( nratio) << 8) * M_SQRT_POW2_15;
- s->spx_signal_blend[ch][bnd] = ff_sqrt((INT24_MAX - nratio) << 8) * M_SQRT_POW2_15;
- bin += bandsize;
-
- /* decode spx coordinates */
- spx_coord_exp = get_bits(gbc, 4);
- spx_coord_mant = get_bits(gbc, 2);
- if (spx_coord_exp == 15)
- s->spx_coords[ch][bnd] = spx_coord_mant << 26;
- else
- s->spx_coords[ch][bnd] = (spx_coord_mant + 4) << 25;
- s->spx_coords[ch][bnd] >>= (spx_coord_exp + master_spx_coord);
- }
- } else {
- s->spx_coords_exist[ch] = 0;
- }
- } else {
- s->first_spx_coords[ch] = 1;
- }
- }
- }
+ /* TODO: spectral extension coordinates */
/* coupling strategy */
if (s->eac3 ? s->cpl_strategy_exists[blk] : get_bits1(gbc)) {
@@ -934,12 +862,9 @@ static int decode_audio_block(AC3DecodeContext *s, int blk)
s->phase_flags_in_use = get_bits1(gbc);
/* coupling frequency range */
+ /* TODO: modify coupling end freq if spectral extension is used */
cpl_start_subband = get_bits(gbc, 4);
- if (s->spx_in_use[blk]) {
- cpl_end_subband = s->spx_start_subband - 1;
- } else {
- cpl_end_subband = get_bits(gbc, 4) + 3;
- }
+ cpl_end_subband = get_bits(gbc, 4) + 3;
s->num_cpl_subbands = cpl_end_subband - cpl_start_subband;
if (s->num_cpl_subbands < 0) {
av_log(s->avctx, AV_LOG_ERROR, "invalid coupling range (%d > %d)\n",
@@ -1014,14 +939,8 @@ static int decode_audio_block(AC3DecodeContext *s, int blk)
if (channel_mode == AC3_CHMODE_STEREO) {
if ((s->eac3 && !blk) || get_bits1(gbc)) {
s->num_rematrixing_bands = 4;
- if (cpl_in_use) {
- if (s->start_freq[CPL_CH] <= 61)
- s->num_rematrixing_bands -= 1 + (s->start_freq[CPL_CH] == 37);
- } else if (s->spx_in_use[blk]) {
- if (s->spx_start_freq <= 61)
- s->num_rematrixing_bands -= 1 + (s->spx_start_freq <= 37) +
- (s->spx_start_freq <= 25);
- }
+ 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);
} else if (!blk) {
@@ -1046,8 +965,6 @@ static int decode_audio_block(AC3DecodeContext *s, int blk)
int prev = s->end_freq[ch];
if (s->channel_in_cpl[ch])
s->end_freq[ch] = s->start_freq[CPL_CH];
- else if (s->channel_in_spx[ch])
- s->end_freq[ch] = s->spx_start_freq;
else {
int bandwidth_code = get_bits(gbc, 6);
if (bandwidth_code > 60) {
@@ -1086,7 +1003,7 @@ static int decode_audio_block(AC3DecodeContext *s, int blk)
s->bit_alloc_params.fast_decay = ff_ac3_fast_decay_tab[get_bits(gbc, 2)] >> s->bit_alloc_params.sr_shift;
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)];
+ s->bit_alloc_params.floor = ff_ac3_floor_tab[get_bits(gbc, 3)];
for(ch=!cpl_in_use; ch<=s->channels; ch++)
bit_alloc_stages[ch] = FFMAX(bit_alloc_stages[ch], 2);
} else if (!blk) {
@@ -1238,12 +1155,12 @@ static int decode_audio_block(AC3DecodeContext *s, int blk)
/* TODO: generate enhanced coupling coordinates and uncouple */
+ /* TODO: apply spectral extension */
+
/* recover coefficients if rematrixing is in use */
if(s->channel_mode == AC3_CHMODE_STEREO)
do_rematrixing(s);
- ff_eac3_apply_spectral_extension(s);
-
/* apply scaling to coefficients (headroom, dynrng) */
for(ch=1; ch<=s->channels; ch++) {
float gain = s->mul_bias / 4194304.0f;
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