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Rewrite ff_sbr_apply in a manner more friendly to PS.

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This includes merging ff_sbr_dequant into ff_sbr_apply.

Originally committed as revision 22995 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Alex Converse 2010-04-30 21:43:23 +00:00
parent bd744c4fd0
commit ca6d3f234c
3 changed files with 25 additions and 24 deletions
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11
libavcodec/aac.c
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@ -1892,15 +1892,12 @@ static void spectral_to_sample(AACContext *ac)
apply_channel_coupling(ac, che, type, i, BETWEEN_TNS_AND_IMDCT, apply_dependent_coupling);
if (type != TYPE_CCE || che->coup.coupling_point == AFTER_IMDCT) {
imdct_and_windowing(ac, &che->ch[0], imdct_bias);
if (ac->m4ac.sbr > 0) {
ff_sbr_dequant(ac, &che->sbr, type == TYPE_CPE ? TYPE_CPE : TYPE_SCE);
ff_sbr_apply(ac, &che->sbr, 0, che->ch[0].ret, che->ch[0].ret);
}
}
if (type == TYPE_CPE) {
imdct_and_windowing(ac, &che->ch[1], imdct_bias);
if (ac->m4ac.sbr > 0)
ff_sbr_apply(ac, &che->sbr, 1, che->ch[1].ret, che->ch[1].ret);
}
if (ac->m4ac.sbr > 0) {
ff_sbr_apply(ac, &che->sbr, type, che->ch[0].ret, che->ch[1].ret);
}
}
if (type <= TYPE_CCE)
apply_channel_coupling(ac, che, type, i, AFTER_IMDCT, apply_independent_coupling);

30
libavcodec/aacsbr.c
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@ -1709,20 +1709,19 @@ static void sbr_hf_assemble(float Y[2][38][64][2], const float X_high[64][40][2]
ch_data->f_indexsine = indexsine;
}
void ff_sbr_dequant(AACContext *ac, SpectralBandReplication *sbr, int id_aac)
void ff_sbr_apply(AACContext *ac, SpectralBandReplication *sbr, int id_aac,
float* L, float* R)
{
int downsampled = ac->m4ac.ext_sample_rate < sbr->sample_rate;
int ch;
int nch = (id_aac == TYPE_CPE) ? 2 : 1;
if (sbr->start) {
sbr_dequant(sbr, id_aac);
}
}
void ff_sbr_apply(AACContext *ac, SpectralBandReplication *sbr, int ch,
const float* in, float* out)
{
int downsampled = ac->m4ac.ext_sample_rate < sbr->sample_rate;
for (ch = 0; ch < nch; ch++) {
/* decode channel */
sbr_qmf_analysis(&ac->dsp, &sbr->rdft, in, sbr->data[ch].analysis_filterbank_samples,
sbr_qmf_analysis(&ac->dsp, &sbr->rdft, ch ? R : L, sbr->data[ch].analysis_filterbank_samples,
(float*)sbr->qmf_filter_scratch,
sbr->data[ch].W, 1/(-1024 * ac->sf_scale));
sbr_lf_gen(ac, sbr, sbr->X_low, sbr->data[ch].W);
@ -1743,9 +1742,16 @@ void ff_sbr_apply(AACContext *ac, SpectralBandReplication *sbr, int ch,
/* synthesis */
sbr_x_gen(sbr, sbr->X, sbr->X_low, sbr->data[ch].Y, ch);
sbr_qmf_synthesis(&ac->dsp, &sbr->mdct, out, sbr->X, sbr->qmf_filter_scratch,
sbr->data[ch].synthesis_filterbank_samples,
&sbr->data[ch].synthesis_filterbank_samples_offset,
}
sbr_qmf_synthesis(&ac->dsp, &sbr->mdct, L, sbr->X, sbr->qmf_filter_scratch,
sbr->data[0].synthesis_filterbank_samples,
&sbr->data[0].synthesis_filterbank_samples_offset,
downsampled,
ac->add_bias, -1024 * ac->sf_scale);
if (nch == 2)
sbr_qmf_synthesis(&ac->dsp, &sbr->mdct, R, sbr->X, sbr->qmf_filter_scratch,
sbr->data[1].synthesis_filterbank_samples,
&sbr->data[1].synthesis_filterbank_samples_offset,
downsampled,
ac->add_bias, -1024 * ac->sf_scale);
}

8
libavcodec/aacsbr.h
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@ -42,10 +42,8 @@ av_cold void ff_aac_sbr_ctx_close(SpectralBandReplication *sbr);
/** Decode one SBR element. */
int ff_decode_sbr_extension(AACContext *ac, SpectralBandReplication *sbr,
GetBitContext *gb, int crc, int cnt, int id_aac);
/** Dequantized all channels in one SBR element. */
void ff_sbr_dequant(AACContext *ac, SpectralBandReplication *sbr, int id_aac);
/** Apply dequantized SBR to a single AAC channel. */
void ff_sbr_apply(AACContext *ac, SpectralBandReplication *sbr, int ch,
const float* in, float* out);
/** Apply one SBR element to one AAC element. */
void ff_sbr_apply(AACContext *ac, SpectralBandReplication *sbr, int id_aac,
float* L, float *R);
#endif /* AVCODEC_AACSBR_H */