diff options
Diffstat (limited to 'libavcodec/dca.c')
| -rw-r--r-- | libavcodec/dca.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/libavcodec/dca.c b/libavcodec/dca.c index 073b1c2386..b81094a000 100644 --- a/libavcodec/dca.c +++ b/libavcodec/dca.c @@ -1394,6 +1394,20 @@ static int dca_decode_frame(AVCodecContext * avctx, /* filter to get final output */ for (i = 0; i < (s->sample_blocks / 8); i++) { dca_filter_channels(s, i); + + /* If this was marked as a DTS-ES stream we need to subtract back- */ + /* channel from SL & SR to remove matrixed back-channel signal */ + if((s->source_pcm_res & 1) && s->xch_present) { + float* back_chan = s->samples + s->channel_order_tab[s->xch_base_channel] * 256; + float* lt_chan = s->samples + s->channel_order_tab[s->xch_base_channel - 2] * 256; + float* rt_chan = s->samples + s->channel_order_tab[s->xch_base_channel - 1] * 256; + int j; + for(j = 0; j < 256; ++j) { + lt_chan[j] -= (back_chan[j] - s->add_bias) * 0.707107f; + rt_chan[j] -= (back_chan[j] - s->add_bias) * 0.707107f; + } + } + s->dsp.float_to_int16_interleave(samples, s->samples_chanptr, 256, channels); samples += 256 * channels; } |