Adding ChunkDemuxer implementation.

media/filters/ffmpeg_glue.h

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // FFmpegGlue is an adapter for FFmpeg's URLProtocol interface that allows us to
 // use a DataSource implementation with FFmpeg. For convenience we use FFmpeg's
 // av_open_input_file function, which analyzes the filename given to it and
 // automatically initializes the appropriate URLProtocol.
 //
 // Since the DataSource is already open by time we call av_open_input_file, we
@@ skipping 46 matching lines @@
   // retrieved.
   virtual bool GetSize(int64* size_out) = 0;
 
   // Returns false if this protocol supports random seeking.
   virtual bool IsStreaming() = 0;
 
  private:
   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.
   static FFmpegGlue* GetInstance();
 
   // Adds a FFmpegProtocol to the FFmpeg glue layer and returns a unique string
   // that can be passed to FFmpeg to identify the data source.
   std::string AddProtocol(FFmpegURLProtocol* protocol);
 
   // Removes a FFmpegProtocol from the FFmpeg glue layer.  Using strings from
@@ skipping 21 matching lines @@
   // Map between keys and FFmpegProtocol references.
   typedef std::map<std::string, FFmpegURLProtocol*> ProtocolMap;
   ProtocolMap protocols_;
 
   DISALLOW_COPY_AND_ASSIGN(FFmpegGlue);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_FILTERS_FFMPEG_GLUE_H_