mirror of https://git.ffmpeg.org/ffmpeg.git
add more OKed parts of the E-AC-3 decoder: structural changes to support AHT mode mantissa decoding
Originally committed as revision 14989 to svn://svn.ffmpeg.org/ffmpeg/trunk
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@ -443,7 +443,7 @@ typedef struct {
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* Get the transform coefficients for a particular channel
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* Get the transform coefficients for a particular channel
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* reference: Section 7.3 Quantization and Decoding of Mantissas
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* reference: Section 7.3 Quantization and Decoding of Mantissas
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*/
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*/
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static void decode_transform_coeffs_ch(AC3DecodeContext *s, int ch_index, mant_groups *m)
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static void ac3_decode_transform_coeffs_ch(AC3DecodeContext *s, int ch_index, mant_groups *m)
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{
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{
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GetBitContext *gbc = &s->gbc;
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GetBitContext *gbc = &s->gbc;
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int i, gcode, tbap, start, end;
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int i, gcode, tbap, start, end;
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@ -548,7 +548,6 @@ static void remove_dithering(AC3DecodeContext *s) {
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}
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}
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}
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}
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#if 0
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static void decode_transform_coeffs_ch(AC3DecodeContext *s, int blk, int ch,
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static void decode_transform_coeffs_ch(AC3DecodeContext *s, int blk, int ch,
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mant_groups *m)
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mant_groups *m)
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{
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{
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@ -558,19 +557,20 @@ static void decode_transform_coeffs_ch(AC3DecodeContext *s, int blk, int ch,
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/* if AHT is used, mantissas for all blocks are encoded in the first
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/* if AHT is used, mantissas for all blocks are encoded in the first
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block of the frame. */
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block of the frame. */
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int bin;
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int bin;
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/*
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if (!blk)
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if (!blk)
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ff_eac3_decode_transform_coeffs_aht_ch(s, ch);
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ff_eac3_decode_transform_coeffs_aht_ch(s, ch);
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*/
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for (bin = s->start_freq[ch]; bin < s->end_freq[ch]; bin++) {
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for (bin = s->start_freq[ch]; bin < s->end_freq[ch]; bin++) {
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s->fixed_coeffs[ch][bin] = s->pre_mantissa[ch][bin][blk] >> s->dexps[ch][bin];
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s->fixed_coeffs[ch][bin] = s->pre_mantissa[ch][bin][blk] >> s->dexps[ch][bin];
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}
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}
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}
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}
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}
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}
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#endif
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/**
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/**
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* Get the transform coefficients.
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* Get the transform coefficients.
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*/
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*/
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static void decode_transform_coeffs(AC3DecodeContext *s)
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static void decode_transform_coeffs(AC3DecodeContext *s, int blk)
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{
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{
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int ch, end;
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int ch, end;
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int got_cplchan = 0;
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int got_cplchan = 0;
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@ -580,12 +580,12 @@ static void decode_transform_coeffs(AC3DecodeContext *s)
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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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/* transform coefficients for full-bandwidth channel */
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/* transform coefficients for full-bandwidth channel */
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decode_transform_coeffs_ch(s, ch, &m);
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decode_transform_coeffs_ch(s, blk, ch, &m);
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/* tranform coefficients for coupling channel come right after the
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/* tranform coefficients for coupling channel come right after the
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coefficients for the first coupled channel*/
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coefficients for the first coupled channel*/
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if (s->channel_in_cpl[ch]) {
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if (s->channel_in_cpl[ch]) {
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if (!got_cplchan) {
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if (!got_cplchan) {
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decode_transform_coeffs_ch(s, CPL_CH, &m);
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decode_transform_coeffs_ch(s, blk, CPL_CH, &m);
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calc_transform_coeffs_cpl(s);
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calc_transform_coeffs_cpl(s);
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got_cplchan = 1;
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got_cplchan = 1;
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}
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}
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@ -1075,7 +1075,7 @@ static int decode_audio_block(AC3DecodeContext *s, int blk)
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/* unpack the transform coefficients
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/* unpack the transform coefficients
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this also uncouples channels if coupling is in use. */
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this also uncouples channels if coupling is in use. */
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decode_transform_coeffs(s);
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decode_transform_coeffs(s, 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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