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atrac1: decode mono audio directly to output buffer

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For stereo we need to use intermediate planar buffers, but mono does not need
to be deinterleaved so the output buffer can be used directly.
This commit is contained in:
Justin Ruggles
2011-10-14 00:22:01 -04:00
parent 33684b9c12
commit 9a35ff3841
1 changed files with 2 additions and 6 deletions
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8
libavcodec/atrac1.c
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@@ -310,15 +310,11 @@ static int atrac1_decode_frame(AVCodecContext *avctx, void *data,
ret = at1_imdct_block(su, q);
if (ret < 0)
return ret;
at1_subband_synthesis(q, su, q->out_samples[ch]);
at1_subband_synthesis(q, su, q->channels == 1 ? samples : q->out_samples[ch]);
}
/* interleave; FIXME, should create/use a DSP function */
if (q->channels == 1) {
/* mono */
memcpy(samples, q->out_samples[0], AT1_SU_SAMPLES * 4);
} else {
/* stereo */
if (q->channels == 2) {
for (i = 0; i < AT1_SU_SAMPLES; i++) {
samples[i * 2] = q->out_samples[0][i];
samples[i * 2 + 1] = q->out_samples[1][i];