Move Liveness from DemuxerStreamProvider to DemuxerStream.

media/base/demuxer_stream.h

Index: media/base/demuxer_stream.h
diff --git a/media/base/demuxer_stream.h b/media/base/demuxer_stream.h
index fd590d374408f02afca54f8db9affdcbacf7e246..6e315f877590f552a7287fedcb4de33aa3d916c4 100644
--- a/media/base/demuxer_stream.h
+++ b/media/base/demuxer_stream.h
@@ -26,6 +26,12 @@ class MEDIA_EXPORT DemuxerStream {
     NUM_TYPES,  // Always keep this entry as the last one!
   };
 
+  enum Liveness {
+    LIVENESS_UNKNOWN,
+    LIVENESS_RECORDED,
+    LIVENESS_LIVE,
+  };
+
   // Status returned in the Read() callback.
   //  kOk : Indicates the second parameter is Non-NULL and contains media data
   //        or the end of the stream.
@@ -58,17 +64,19 @@ class MEDIA_EXPORT DemuxerStream {
                               const scoped_refptr<DecoderBuffer>&)>ReadCB;
   virtual void Read(const ReadCB& read_cb) = 0;
 
-  // Returns the audio decoder configuration. It is an error to call this method
-  // if type() != AUDIO.
+  // Returns the audio/video decoder configuration. It is an error to call the
+  // audio method on a video stream and vice versa. After |kConfigChanged| is
+  // returned in a Read(), the caller should call this method again to retrieve
+  // the new config.
   virtual AudioDecoderConfig audio_decoder_config() = 0;
-
-  // Returns the video decoder configuration. It is an error to call this method
-  // if type() != VIDEO.
   virtual VideoDecoderConfig video_decoder_config() = 0;
 
   // Returns the type of stream.
   virtual Type type() = 0;

[wolenetz, 2014/11/11 23:48:07]

nit: adding const seems reasonable to me here (and in overrides).

[xhwang, 2014/11/14 06:38:04]

Done.

 
+  // Returns liveness of the streams provided, i.e. whether recorded or live.
+  virtual Liveness liveness();

[wolenetz, 2014/11/11 23:48:07]

nit: ditto const

[xhwang, 2014/11/14 06:38:04]

Done.

+
   virtual void EnableBitstreamConverter();
 
   // Whether or not this DemuxerStream allows midstream configuration changes.