Create video and audio decoder threads on demand.

media/filters/ffmpeg_video_decoder.h

Index: media/filters/ffmpeg_video_decoder.h
diff --git a/media/filters/ffmpeg_video_decoder.h b/media/filters/ffmpeg_video_decoder.h
index 1e9f74d9fa3fc3384e2835d0594af86dfcdacaae..f300660ee6a9da40cfb7cc766394c1a9f5ad3210 100644
--- a/media/filters/ffmpeg_video_decoder.h
+++ b/media/filters/ffmpeg_video_decoder.h
@@ -7,6 +7,7 @@
 
 #include <deque>
 
+#include "base/callback.h"
 #include "base/memory/scoped_ptr.h"
 #include "media/base/filters.h"
 #include "media/crypto/aes_decryptor.h"
@@ -19,9 +20,11 @@ struct AVFrame;
 
 namespace media {
 
+class MessageLoopFactory;

[Ami GONE FROM CHROMIUM, 2012/03/09 16:15:06]

unnecessary

[tommi (sloooow) - chröme, 2012/03/11 18:49:36]

Done.

+
 class MEDIA_EXPORT FFmpegVideoDecoder : public VideoDecoder {
  public:
-  explicit FFmpegVideoDecoder(MessageLoop* message_loop);
+  FFmpegVideoDecoder(const base::Callback<MessageLoop*()>& message_loop_cb);
   virtual ~FFmpegVideoDecoder();
 
   // Filter implementation.
@@ -68,6 +71,8 @@ class MEDIA_EXPORT FFmpegVideoDecoder : public VideoDecoder {
   // the current state of |codec_context_|.
   scoped_refptr<VideoFrame> AllocateVideoFrame();
 
+  base::Callback<MessageLoop*()> message_loop_cb_;

[Ami GONE FROM CHROMIUM, 2012/03/09 16:15:06]

s/message_loop_cb_/message_loop_factory_cb_/
and add a comment that this is !is_null() iff Initialize() hasn't been called
yet.

[tommi (sloooow) - chröme, 2012/03/11 18:49:36]

Done.

+
   MessageLoop* message_loop_;
 
   DecoderState state_;