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@ -749,8 +749,8 @@ static void decode_band_structure(GetBitContext *gbc, int blk, int eac3, |
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/* calculate number of bands and band sizes based on band structure.
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/* calculate number of bands and band sizes based on band structure.
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note that the first 4 subbands in enhanced coupling span only 6 bins |
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note that the first 4 subbands in enhanced coupling span only 6 bins |
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instead of 12. */ |
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instead of 12. */ |
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n_bands = n_subbands; |
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if (num_bands || band_sizes ) { |
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if (num_bands || band_sizes ) { |
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n_bands = n_subbands; |
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bnd_sz[0] = ecpl ? 6 : 12; |
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bnd_sz[0] = ecpl ? 6 : 12; |
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for (bnd = 0, subbnd = 1; subbnd < n_subbands; subbnd++) { |
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for (bnd = 0, subbnd = 1; subbnd < n_subbands; subbnd++) { |
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int subbnd_size = (ecpl && subbnd < 4) ? 6 : 12; |
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int subbnd_size = (ecpl && subbnd < 4) ? 6 : 12; |
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@ -818,86 +818,14 @@ static int decode_audio_block(AC3DecodeContext *s, int blk) |
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/* spectral extension strategy */ |
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/* spectral extension strategy */ |
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if (s->eac3 && (!blk || get_bits1(gbc))) { |
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if (s->eac3 && (!blk || get_bits1(gbc))) { |
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s->spx_in_use[blk] = get_bits1(gbc); |
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if (get_bits1(gbc)) { |
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if (s->spx_in_use[blk]) { |
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av_log_missing_feature(s->avctx, "Spectral extension", 1); |
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int begf, endf; |
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return -1; |
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int spx_end_subband; |
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/* determine which channels use spx */ |
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if (s->channel_mode == AC3_CHMODE_MONO) { |
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s->channel_in_spx[1] = 1; |
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s->spx_coords_exist[1] = 0; |
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} else { |
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for (ch = 1; ch <= fbw_channels; ch++) { |
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s->channel_in_spx[ch] = get_bits1(gbc); |
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s->spx_coords_exist[ch] = 0; |
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} |
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} |
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s->spx_copy_start_freq = get_bits(gbc, 2) * 12 + 25; |
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begf = get_bits(gbc, 3); |
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endf = get_bits(gbc, 3); |
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s->spx_start_subband = begf < 6 ? begf+2 : 2*begf-3; |
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spx_end_subband = endf < 4 ? endf+5 : 2*endf+3; |
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s->num_spx_subbands = spx_end_subband - s->spx_start_subband; |
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s->spx_start_freq = s->spx_start_subband * 12 + 25; |
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s->spx_end_freq = spx_end_subband * 12 + 25; |
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decode_band_structure(gbc, blk, s->eac3, 0, |
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s->spx_start_subband, spx_end_subband, |
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ff_eac3_default_spx_band_struct, |
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s->spx_band_struct, NULL, &s->num_spx_bands, |
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s->spx_band_sizes); |
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} else { |
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for (ch = 1; ch <= fbw_channels; ch++) { |
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s->channel_in_spx[ch] = 0; |
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s->first_spx_coords[ch] = 1; |
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} |
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} |
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} |
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} else { |
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/* TODO: parse spectral extension strategy info */ |
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s->spx_in_use[blk] = blk ? s->spx_in_use[blk-1] : 0; |
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} |
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} |
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/* spectral extension coordinates */ |
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/* TODO: spectral extension coordinates */ |
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if (s->spx_in_use[blk]) { |
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for (ch = 1; ch <= fbw_channels; ch++) { |
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if (s->channel_in_spx[ch]) { |
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if (s->first_spx_coords[ch] || get_bits1(gbc)) { |
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int bin, spx_blend; |
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int master_spx_coord; |
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s->first_spx_coords[ch] = 0; |
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s->spx_coords_exist[ch] = 1; |
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spx_blend = get_bits(gbc, 5) << 18; |
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master_spx_coord = get_bits(gbc, 2) * 3; |
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bin = s->spx_start_freq; |
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for (bnd = 0; bnd < s->num_spx_bands; bnd++) { |
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int spx_coord_exp, spx_coord_mant; |
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/* calculate blending factors */ |
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int bandsize = s->spx_band_sizes[bnd]; |
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int nratio = (((bin + (bandsize >> 1)) << 23) / s->spx_end_freq) - spx_blend; |
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nratio = av_clip(nratio, 0, INT24_MAX); |
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s->spx_noise_blend [ch][bnd] = ff_sqrt(( nratio) << 8) * M_SQRT_POW2_15; |
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s->spx_signal_blend[ch][bnd] = ff_sqrt((INT24_MAX - nratio) << 8) * M_SQRT_POW2_15; |
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bin += bandsize; |
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/* decode spx coordinates */ |
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spx_coord_exp = get_bits(gbc, 4); |
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spx_coord_mant = get_bits(gbc, 2); |
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if (spx_coord_exp == 15) |
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s->spx_coords[ch][bnd] = spx_coord_mant << 26; |
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else |
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s->spx_coords[ch][bnd] = (spx_coord_mant + 4) << 25; |
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s->spx_coords[ch][bnd] >>= (spx_coord_exp + master_spx_coord); |
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} |
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} else { |
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s->spx_coords_exist[ch] = 0; |
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} |
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} else { |
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s->first_spx_coords[ch] = 1; |
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} |
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} |
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} |
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/* coupling strategy */ |
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/* coupling strategy */ |
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if (s->eac3 ? s->cpl_strategy_exists[blk] : get_bits1(gbc)) { |
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if (s->eac3 ? s->cpl_strategy_exists[blk] : get_bits1(gbc)) { |
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@ -934,12 +862,9 @@ static int decode_audio_block(AC3DecodeContext *s, int blk) |
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s->phase_flags_in_use = get_bits1(gbc); |
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s->phase_flags_in_use = get_bits1(gbc); |
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/* coupling frequency range */ |
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/* coupling frequency range */ |
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/* TODO: modify coupling end freq if spectral extension is used */ |
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cpl_start_subband = get_bits(gbc, 4); |
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cpl_start_subband = get_bits(gbc, 4); |
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if (s->spx_in_use[blk]) { |
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cpl_end_subband = get_bits(gbc, 4) + 3; |
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cpl_end_subband = s->spx_start_subband - 1; |
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} else { |
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cpl_end_subband = get_bits(gbc, 4) + 3; |
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} |
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s->num_cpl_subbands = cpl_end_subband - cpl_start_subband; |
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s->num_cpl_subbands = cpl_end_subband - cpl_start_subband; |
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if (s->num_cpl_subbands < 0) { |
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if (s->num_cpl_subbands < 0) { |
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av_log(s->avctx, AV_LOG_ERROR, "invalid coupling range (%d > %d)\n", |
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av_log(s->avctx, AV_LOG_ERROR, "invalid coupling range (%d > %d)\n", |
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@ -1014,14 +939,8 @@ static int decode_audio_block(AC3DecodeContext *s, int blk) |
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if (channel_mode == AC3_CHMODE_STEREO) { |
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if (channel_mode == AC3_CHMODE_STEREO) { |
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if ((s->eac3 && !blk) || get_bits1(gbc)) { |
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if ((s->eac3 && !blk) || get_bits1(gbc)) { |
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s->num_rematrixing_bands = 4; |
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s->num_rematrixing_bands = 4; |
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if (cpl_in_use) { |
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if(cpl_in_use && s->start_freq[CPL_CH] <= 61) |
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if (s->start_freq[CPL_CH] <= 61) |
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s->num_rematrixing_bands -= 1 + (s->start_freq[CPL_CH] == 37); |
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s->num_rematrixing_bands -= 1 + (s->start_freq[CPL_CH] == 37); |
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} else if (s->spx_in_use[blk]) { |
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if (s->spx_start_freq <= 61) |
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s->num_rematrixing_bands -= 1 + (s->spx_start_freq <= 37) + |
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(s->spx_start_freq <= 25); |
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} |
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for(bnd=0; bnd<s->num_rematrixing_bands; bnd++) |
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for(bnd=0; bnd<s->num_rematrixing_bands; bnd++) |
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s->rematrixing_flags[bnd] = get_bits1(gbc); |
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s->rematrixing_flags[bnd] = get_bits1(gbc); |
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} else if (!blk) { |
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} else if (!blk) { |
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@ -1046,8 +965,6 @@ static int decode_audio_block(AC3DecodeContext *s, int blk) |
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int prev = s->end_freq[ch]; |
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int prev = s->end_freq[ch]; |
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if (s->channel_in_cpl[ch]) |
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if (s->channel_in_cpl[ch]) |
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s->end_freq[ch] = s->start_freq[CPL_CH]; |
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s->end_freq[ch] = s->start_freq[CPL_CH]; |
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else if (s->channel_in_spx[ch]) |
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s->end_freq[ch] = s->spx_start_freq; |
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else { |
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else { |
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int bandwidth_code = get_bits(gbc, 6); |
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int bandwidth_code = get_bits(gbc, 6); |
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if (bandwidth_code > 60) { |
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if (bandwidth_code > 60) { |
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@ -1086,7 +1003,7 @@ static int decode_audio_block(AC3DecodeContext *s, int blk) |
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s->bit_alloc_params.fast_decay = ff_ac3_fast_decay_tab[get_bits(gbc, 2)] >> s->bit_alloc_params.sr_shift; |
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s->bit_alloc_params.fast_decay = ff_ac3_fast_decay_tab[get_bits(gbc, 2)] >> s->bit_alloc_params.sr_shift; |
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s->bit_alloc_params.slow_gain = ff_ac3_slow_gain_tab[get_bits(gbc, 2)]; |
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s->bit_alloc_params.slow_gain = ff_ac3_slow_gain_tab[get_bits(gbc, 2)]; |
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s->bit_alloc_params.db_per_bit = ff_ac3_db_per_bit_tab[get_bits(gbc, 2)]; |
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s->bit_alloc_params.db_per_bit = ff_ac3_db_per_bit_tab[get_bits(gbc, 2)]; |
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s->bit_alloc_params.floor = ff_ac3_floor_tab[get_bits(gbc, 3)]; |
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s->bit_alloc_params.floor = ff_ac3_floor_tab[get_bits(gbc, 3)]; |
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for(ch=!cpl_in_use; ch<=s->channels; ch++) |
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for(ch=!cpl_in_use; ch<=s->channels; ch++) |
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bit_alloc_stages[ch] = FFMAX(bit_alloc_stages[ch], 2); |
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bit_alloc_stages[ch] = FFMAX(bit_alloc_stages[ch], 2); |
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} else if (!blk) { |
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} else if (!blk) { |
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@ -1238,12 +1155,12 @@ static int decode_audio_block(AC3DecodeContext *s, int blk) |
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/* TODO: generate enhanced coupling coordinates and uncouple */ |
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/* TODO: generate enhanced coupling coordinates and uncouple */ |
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/* TODO: apply spectral extension */ |
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/* recover coefficients if rematrixing is in use */ |
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/* recover coefficients if rematrixing is in use */ |
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if(s->channel_mode == AC3_CHMODE_STEREO) |
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if(s->channel_mode == AC3_CHMODE_STEREO) |
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do_rematrixing(s); |
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do_rematrixing(s); |
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ff_eac3_apply_spectral_extension(s); |
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/* apply scaling to coefficients (headroom, dynrng) */ |
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/* apply scaling to coefficients (headroom, dynrng) */ |
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for(ch=1; ch<=s->channels; ch++) { |
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for(ch=1; ch<=s->channels; ch++) { |
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float gain = s->mul_bias / 4194304.0f; |
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float gain = s->mul_bias / 4194304.0f; |
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