This is neither necessary nor currently supported.
---
libavcodec/dcadec.c | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/libavcodec/dcadec.c b/libavcodec/dcadec.c
index 92edce7..49d7aac 100644
--- a/libavcodec/dcadec.c
+++ b/libavcodec/dcadec.c
@@ -1850,6 +1850,16 @@ static int dca_decode_frame(AVCodecContext *avctx, void
*data,
if (s->amode < 16) {
avctx->channel_layout = dca_core_channel_layout[s->amode];
+ if (s->prim_channels + !!s->lfe > 2 &&
+ avctx->request_channel_layout == AV_CH_LAYOUT_STEREO) {
+ /*
+ * Neither the core's auxiliary data nor our default tables contain
+ * downmix coefficients for the additional channel coded in the XCh
+ * extension, so when we're doing a Stereo downmix, don't decode
it.
+ */
+ s->xch_disable = 1;
+ }
+
#if FF_API_REQUEST_CHANNELS
FF_DISABLE_DEPRECATION_WARNINGS
if (s->xch_present && !s->xch_disable &&
--
1.8.5.2 (Apple Git-48)
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