FFmpeg fixups for M33 roll. Now with more Opus!

media/filters/opus_audio_decoder.cc

Index: media/filters/opus_audio_decoder.cc
diff --git a/media/filters/opus_audio_decoder.cc b/media/filters/opus_audio_decoder.cc
index 7aa931930aecc1bc249f06fe7e9e73a0f0a57f96..37e1abda698328542350b510558a1763cda60392 100644
--- a/media/filters/opus_audio_decoder.cc
+++ b/media/filters/opus_audio_decoder.cc
@@ -601,11 +601,13 @@ bool OpusAudioDecoder::Decode(const scoped_refptr<DecoderBuffer>& input,
 
   // Decoding finished successfully, update statistics.
   PipelineStatistics statistics;
-  statistics.audio_bytes_decoded =
-      frames_decoded *
-      demuxer_stream_->audio_decoder_config().bytes_per_frame();
+  statistics.audio_bytes_decoded = input->data_size();
   statistics_cb_.Run(statistics);
 
+  // Discard the buffer to indicate we need more data.
+  if (!frames_decoded)
+    *output_buffer = NULL;
+
   return true;
 }