Add initial implementation of SourceBufferStream

media/base/buffers.h

Index: media/base/buffers.h
diff --git a/media/base/buffers.h b/media/base/buffers.h
index f4e42642b4f240ce961d987094d59e80365c5dcb..b98b8ae32adf87d7acccdb7618a158b03aa6fb11 100644
--- a/media/base/buffers.h
+++ b/media/base/buffers.h
@@ -27,6 +27,7 @@
 #define MEDIA_BASE_BUFFERS_H_
 
 #include "base/basictypes.h"
+#include "base/logging.h"
 #include "base/memory/ref_counted.h"
 #include "base/time.h"
 #include "media/base/media_export.h"
@@ -73,6 +74,17 @@ class MEDIA_EXPORT Buffer : public base::RefCountedThreadSafe<Buffer> {
     duration_ = duration;
   }
 
+  virtual bool IsKeyframe() const {

[scherkus (not reviewing), 2012/04/25 22:59:00]

don't inline virtual methods in .h
http://dev.chromium.org/developers/coding-style/cpp-dos-and-donts

also couldn't virtual + MockDataBuffer be replaced with a call to SetKeyframe()
in the unit test?

[vrk (LEFT CHROMIUM), 2012/04/25 23:25:48]

Yeahhh as I explained offline, I was worried that people would use these methods
when they're not actually supported yet, but probably not worth worrying about.
Devirtualized and got rid of the Mock.

We could/should? have ChunkedDemuxer use a special derived class of Buffer that
has these methods on it, so as not to pollute the Buffer base class with methods
that only ChunkDemuxer + friends care about. But since we're not sure yet if
that's the right direction to go in, I'll just keep the methods in Buffer with a
TODO.

+    // TODO(vrk): Remove this when keyframes are marked as such.
+    NOTIMPLEMENTED();
+
+    return is_keyframe_;
+  }
+
+  void SetKeyframe(bool is_keyframe) {
+    is_keyframe_ = is_keyframe;
+  }
+
  protected:
   friend class base::RefCountedThreadSafe<Buffer>;
   Buffer(base::TimeDelta timestamp, base::TimeDelta duration);
@@ -81,6 +93,7 @@ class MEDIA_EXPORT Buffer : public base::RefCountedThreadSafe<Buffer> {
  private:
   base::TimeDelta timestamp_;
   base::TimeDelta duration_;
+  bool is_keyframe_;
 
   DISALLOW_COPY_AND_ASSIGN(Buffer);
 };