Add live mode detection in WebM MediaSource parser.

media/filters/ffmpeg_video_decoder.cc

Index: media/filters/ffmpeg_video_decoder.cc
diff --git a/media/filters/ffmpeg_video_decoder.cc b/media/filters/ffmpeg_video_decoder.cc
index 53ee43786d21bf1e77385b22ba6e5fa4b5937a48..68a482c14146ae01a3a7988730b9b73a76a4a793 100644
--- a/media/filters/ffmpeg_video_decoder.cc
+++ b/media/filters/ffmpeg_video_decoder.cc
@@ -344,6 +344,8 @@ bool FFmpegVideoDecoder::ConfigureDecoder() {
   // for damaged macroblocks, and set our error detection sensitivity.
   codec_context_->error_concealment = FF_EC_GUESS_MVS | FF_EC_DEBLOCK;
   codec_context_->thread_count = GetThreadCount(codec_context_->codec_id);
+  codec_context_->thread_type =

[scherkus (not reviewing), 2014/04/10 21:11:49]

hmm... did we still want threaded slicing or to disable threading altogether?

[Sergey Ulanov, 2014/04/10 23:10:07]

I think slicing may be useful for live streams to minimize latency introduced by
the decoder.

+      config_.live_mode() ? FF_THREAD_SLICE : FF_THREAD_FRAME;
   codec_context_->opaque = this;
   codec_context_->flags |= CODEC_FLAG_EMU_EDGE;
   codec_context_->get_buffer = GetVideoBufferImpl;