opusenc: do not cause the decoder to apply the channel mapping again

Since we already reorder channels, we do not want to write that
reordering in the header, or the decoder will do it again.

diff --git a/ext/opus/gstopusenc.c b/ext/opus/gstopusenc.c
index 6dad531..11ddcc1 100644 (file)
--- a/ext/opus/gstopusenc.c
+++ b/ext/opus/gstopusenc.c
@@ -532,13 +532,17 @@ gst_opus_enc_set_format (GstAudioEncoder * benc, GstAudioInfo * info)
 static gboolean
 gst_opus_enc_setup (GstOpusEnc * enc)
 {
-  int error = OPUS_OK;
+  int error = OPUS_OK, n;
+  guint8 trivial_mapping[256];
 
   GST_DEBUG_OBJECT (enc, "setup");
 
+  for (n = 0; n < 256; ++n)
+    trivial_mapping[n] = n;
+
   enc->state =
       opus_multistream_encoder_create (enc->sample_rate, enc->n_channels,
-      (enc->n_channels + 1) / 2, enc->n_channels / 2, enc->channel_mapping,
+      (enc->n_channels + 1) / 2, enc->n_channels / 2, trivial_mapping,
       enc->audio_or_voip ? OPUS_APPLICATION_AUDIO : OPUS_APPLICATION_VOIP,
       &error);
   if (!enc->state || error != OPUS_OK)