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https://github.com/xenia-project/FFmpeg.git
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ac3dec: Split coupling-specific code from decode_audio_block()
Signed-off-by: Diego Biurrun <diego@biurrun.de>
This commit is contained in:
Luca Barbato
Diego Biurrun
parent
a5ebe5d121
commit
f0ccc65bc9
@ -849,6 +849,118 @@ static inline void spx_coordinates(AC3DecodeContext *s)
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}
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}
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static inline int coupling_strategy(AC3DecodeContext *s, int blk,
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uint8_t *bit_alloc_stages)
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{
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GetBitContext *bc = &s->gbc;
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int fbw_channels = s->fbw_channels;
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int channel_mode = s->channel_mode;
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int ch;
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memset(bit_alloc_stages, 3, AC3_MAX_CHANNELS);
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if (!s->eac3)
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s->cpl_in_use[blk] = get_bits1(bc);
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if (s->cpl_in_use[blk]) {
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/* coupling in use */
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int cpl_start_subband, cpl_end_subband;
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if (channel_mode < AC3_CHMODE_STEREO) {
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av_log(s->avctx, AV_LOG_ERROR, "coupling not allowed in mono or dual-mono\n");
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return AVERROR_INVALIDDATA;
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}
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/* check for enhanced coupling */
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if (s->eac3 && get_bits1(bc)) {
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/* TODO: parse enhanced coupling strategy info */
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avpriv_request_sample(s->avctx, "Enhanced coupling");
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return AVERROR_PATCHWELCOME;
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}
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/* determine which channels are coupled */
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if (s->eac3 && s->channel_mode == AC3_CHMODE_STEREO) {
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s->channel_in_cpl[1] = 1;
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s->channel_in_cpl[2] = 1;
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} else {
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for (ch = 1; ch <= fbw_channels; ch++)
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s->channel_in_cpl[ch] = get_bits1(bc);
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}
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/* phase flags in use */
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if (channel_mode == AC3_CHMODE_STEREO)
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s->phase_flags_in_use = get_bits1(bc);
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/* coupling frequency range */
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cpl_start_subband = get_bits(bc, 4);
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cpl_end_subband = s->spx_in_use ? (s->spx_src_start_freq - 37) / 12 :
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get_bits(bc, 4) + 3;
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if (cpl_start_subband >= cpl_end_subband) {
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av_log(s->avctx, AV_LOG_ERROR, "invalid coupling range (%d >= %d)\n",
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cpl_start_subband, cpl_end_subband);
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return AVERROR_INVALIDDATA;
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}
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s->start_freq[CPL_CH] = cpl_start_subband * 12 + 37;
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s->end_freq[CPL_CH] = cpl_end_subband * 12 + 37;
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decode_band_structure(bc, blk, s->eac3, 0, cpl_start_subband,
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cpl_end_subband,
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ff_eac3_default_cpl_band_struct,
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&s->num_cpl_bands, s->cpl_band_sizes);
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} else {
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/* coupling not in use */
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for (ch = 1; ch <= fbw_channels; ch++) {
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s->channel_in_cpl[ch] = 0;
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s->first_cpl_coords[ch] = 1;
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}
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s->first_cpl_leak = s->eac3;
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s->phase_flags_in_use = 0;
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}
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return 0;
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}
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static inline int coupling_coordinates(AC3DecodeContext *s, int blk)
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{
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GetBitContext *bc = &s->gbc;
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int fbw_channels = s->fbw_channels;
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int ch, bnd;
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int cpl_coords_exist = 0;
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for (ch = 1; ch <= fbw_channels; ch++) {
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if (s->channel_in_cpl[ch]) {
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if ((s->eac3 && s->first_cpl_coords[ch]) || get_bits1(bc)) {
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int master_cpl_coord, cpl_coord_exp, cpl_coord_mant;
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s->first_cpl_coords[ch] = 0;
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cpl_coords_exist = 1;
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master_cpl_coord = 3 * get_bits(bc, 2);
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for (bnd = 0; bnd < s->num_cpl_bands; bnd++) {
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cpl_coord_exp = get_bits(bc, 4);
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cpl_coord_mant = get_bits(bc, 4);
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if (cpl_coord_exp == 15)
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s->cpl_coords[ch][bnd] = cpl_coord_mant << 22;
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else
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s->cpl_coords[ch][bnd] = (cpl_coord_mant + 16) << 21;
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s->cpl_coords[ch][bnd] >>= (cpl_coord_exp + master_cpl_coord);
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}
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} else if (!blk) {
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av_log(s->avctx, AV_LOG_ERROR, "new coupling coordinates must "
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"be present in block 0\n");
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return AVERROR_INVALIDDATA;
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}
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} else {
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/* channel not in coupling */
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s->first_cpl_coords[ch] = 1;
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}
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}
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/* phase flags */
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if (s->channel_mode == AC3_CHMODE_STEREO && cpl_coords_exist) {
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for (bnd = 0; bnd < s->num_cpl_bands; bnd++) {
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s->phase_flags[bnd] = s->phase_flags_in_use ? get_bits1(bc) : 0;
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}
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}
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return 0;
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}
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/**
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* Decode a single audio block from the AC-3 bitstream.
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*/
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@ -916,63 +1028,8 @@ static int decode_audio_block(AC3DecodeContext *s, int blk)
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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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memset(bit_alloc_stages, 3, AC3_MAX_CHANNELS);
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if (!s->eac3)
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s->cpl_in_use[blk] = get_bits1(gbc);
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if (s->cpl_in_use[blk]) {
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/* coupling in use */
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int cpl_start_subband, cpl_end_subband;
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if (channel_mode < AC3_CHMODE_STEREO) {
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av_log(s->avctx, AV_LOG_ERROR, "coupling not allowed in mono or dual-mono\n");
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return AVERROR_INVALIDDATA;
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}
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/* check for enhanced coupling */
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if (s->eac3 && get_bits1(gbc)) {
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/* TODO: parse enhanced coupling strategy info */
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avpriv_request_sample(s->avctx, "Enhanced coupling");
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return AVERROR_PATCHWELCOME;
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}
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/* determine which channels are coupled */
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if (s->eac3 && s->channel_mode == AC3_CHMODE_STEREO) {
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s->channel_in_cpl[1] = 1;
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s->channel_in_cpl[2] = 1;
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} else {
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for (ch = 1; ch <= fbw_channels; ch++)
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s->channel_in_cpl[ch] = get_bits1(gbc);
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}
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/* phase flags in use */
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if (channel_mode == AC3_CHMODE_STEREO)
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s->phase_flags_in_use = get_bits1(gbc);
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/* coupling frequency range */
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cpl_start_subband = get_bits(gbc, 4);
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cpl_end_subband = s->spx_in_use ? (s->spx_src_start_freq - 37) / 12 :
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get_bits(gbc, 4) + 3;
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if (cpl_start_subband >= cpl_end_subband) {
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av_log(s->avctx, AV_LOG_ERROR, "invalid coupling range (%d >= %d)\n",
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cpl_start_subband, cpl_end_subband);
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return AVERROR_INVALIDDATA;
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}
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s->start_freq[CPL_CH] = cpl_start_subband * 12 + 37;
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s->end_freq[CPL_CH] = cpl_end_subband * 12 + 37;
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decode_band_structure(gbc, blk, s->eac3, 0, cpl_start_subband,
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cpl_end_subband,
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ff_eac3_default_cpl_band_struct,
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&s->num_cpl_bands, s->cpl_band_sizes);
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} else {
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/* coupling not in use */
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for (ch = 1; ch <= fbw_channels; ch++) {
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s->channel_in_cpl[ch] = 0;
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s->first_cpl_coords[ch] = 1;
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}
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s->first_cpl_leak = s->eac3;
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s->phase_flags_in_use = 0;
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}
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if ((ret = coupling_strategy(s, blk, bit_alloc_stages)) < 0)
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return ret;
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} else if (!s->eac3) {
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if (!blk) {
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av_log(s->avctx, AV_LOG_ERROR, "new coupling strategy must "
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@ -986,40 +1043,8 @@ static int decode_audio_block(AC3DecodeContext *s, int blk)
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/* coupling coordinates */
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if (cpl_in_use) {
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int cpl_coords_exist = 0;
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for (ch = 1; ch <= fbw_channels; ch++) {
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if (s->channel_in_cpl[ch]) {
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if ((s->eac3 && s->first_cpl_coords[ch]) || get_bits1(gbc)) {
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int master_cpl_coord, cpl_coord_exp, cpl_coord_mant;
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s->first_cpl_coords[ch] = 0;
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cpl_coords_exist = 1;
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master_cpl_coord = 3 * get_bits(gbc, 2);
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for (bnd = 0; bnd < s->num_cpl_bands; bnd++) {
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cpl_coord_exp = get_bits(gbc, 4);
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cpl_coord_mant = get_bits(gbc, 4);
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if (cpl_coord_exp == 15)
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s->cpl_coords[ch][bnd] = cpl_coord_mant << 22;
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else
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s->cpl_coords[ch][bnd] = (cpl_coord_mant + 16) << 21;
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s->cpl_coords[ch][bnd] >>= (cpl_coord_exp + master_cpl_coord);
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}
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} else if (!blk) {
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av_log(s->avctx, AV_LOG_ERROR, "new coupling coordinates must "
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"be present in block 0\n");
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return AVERROR_INVALIDDATA;
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}
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} else {
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/* channel not in coupling */
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s->first_cpl_coords[ch] = 1;
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}
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}
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/* phase flags */
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if (channel_mode == AC3_CHMODE_STEREO && cpl_coords_exist) {
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for (bnd = 0; bnd < s->num_cpl_bands; bnd++) {
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s->phase_flags[bnd] = s->phase_flags_in_use? get_bits1(gbc) : 0;
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}
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}
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if ((ret = coupling_coordinates(s, blk)) < 0)
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return ret;
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}
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/* stereo rematrixing strategy and band structure */
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