Adding ChunkDemuxer implementation.

media/filters/ffmpeg_glue.h

Index: media/filters/ffmpeg_glue.h
diff --git a/media/filters/ffmpeg_glue.h b/media/filters/ffmpeg_glue.h
index a98c50219d1445083f086af4e8637ab4770a7ead..324547bbcc64df0ea83496a0c99be434d284721b 100644
--- a/media/filters/ffmpeg_glue.h
+++ b/media/filters/ffmpeg_glue.h
@@ -64,6 +64,30 @@ class FFmpegURLProtocol {
   DISALLOW_COPY_AND_ASSIGN(FFmpegURLProtocol);
 };
 
+// Simple FFmpegURLProtocol that reads from a buffer.
+// NOTE: This object does not copy the buffer so the
+//       buffer pointer passed into the constructor
+//       needs to remain valid for the entire lifetime of
+//       this object.
+class BufferUrlProtocol : public FFmpegURLProtocol {

[scherkus (not reviewing), 2011/06/22 17:31:09]

any reason why this class can't be a part of the chunk demuxer / moved to its
own file?

this file contains FFmpegGlue + its interface (FFmpegURLProtocol) but no
concrete impls

[acolwell GONE FROM CHROMIUM, 2011/06/23 16:51:28]

Done. Moved code to media/filters/buffer_url_protocol.h &
media/filters/buffer_url_protocol.cc.

+ public:
+  BufferUrlProtocol(const uint8* buf, int size, bool streaming);
+  virtual ~BufferUrlProtocol();
+
+  // FFmpegURLProtocol methods.
+  virtual int Read(int size, uint8* data);
+  virtual bool GetPosition(int64* position_out);
+  virtual bool SetPosition(int64 position);
+  virtual bool GetSize(int64* size_out);
+  virtual bool IsStreaming();
+
+ private:
+  const uint8* buf_;
+  int size_;
+  int offset_;
+  bool streaming_;
+};

[scherkus (not reviewing), 2011/06/22 17:31:09]

DISALLOW etc.

[acolwell GONE FROM CHROMIUM, 2011/06/23 16:51:28]

Done.

+
 class FFmpegGlue {
  public:
   // Returns the singleton instance.