Add plumbing and support for crossfading StreamParserBuffers.

media/filters/source_buffer_stream.h

Index: media/filters/source_buffer_stream.h
diff --git a/media/filters/source_buffer_stream.h b/media/filters/source_buffer_stream.h
index ff5763b42917175332ec86b84895339546bfd273..12b7bcf4652c8259e22a0a07c9a5fec08e2d35f3 100644
--- a/media/filters/source_buffer_stream.h
+++ b/media/filters/source_buffer_stream.h
@@ -293,6 +293,9 @@ class MEDIA_EXPORT SourceBufferStream {
 
   bool is_video() const { return video_configs_.size() > 0; }
 
+  // See GetNextBuffer().

[acolwell GONE FROM CHROMIUM, 2014/01/10 22:53:31]

nit: It would be good to at least outline the division of responsibility between
GetNextBuffer() and GetNextBufferInternal().

+  Status GetNextBufferInternal(scoped_refptr<StreamParserBuffer>* out_buffer);
+
   // Callback used to report error strings that can help the web developer
   // figure out what is wrong with the content.
   LogCB log_cb_;
@@ -369,6 +372,16 @@ class MEDIA_EXPORT SourceBufferStream {
   // GetCurrentXXXDecoderConfig() has been called.
   bool config_change_pending_;
 
+  // Used by GetNextBuffer() when a buffer with fade out is returned from
+  // GetNextBufferInternal().  Will be set to the returned buffer and will be
+  // consumed after the fade out section has been exhausted.
+  scoped_refptr<StreamParserBuffer> fade_in_buffer_;
+
+  // Indicates which of the fade out preroll buffers in |fade_in_buffer_| should
+  // be handled out next.
+  size_t fade_out_preroll_index_;
+
+
   DISALLOW_COPY_AND_ASSIGN(SourceBufferStream);
 };