Fire CanPlayThrough immediately for local and streaming media files

media/filters/ffmpeg_demuxer.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.
 
 // Implements the Demuxer interface using FFmpeg's libavformat.  At this time
 // will support demuxing any audio/video format thrown at it.  The streams
 // output mime types audio/x-ffmpeg and video/x-ffmpeg and include an integer
 // key FFmpegCodecID which contains the CodecID enumeration value.  The CodecIDs
 // can be used to create and initialize the corresponding FFmpeg decoder.
 //
@@ skipping 110 matching lines @@
   // already been demuxed without having the demuxer thread sending the
   // buffers. |lock_| must be acquired before any access to |buffer_queue_|,
   // |read_queue_|, or |stopped_|.
   base::Lock lock_;
 
   DISALLOW_COPY_AND_ASSIGN(FFmpegDemuxerStream);
 };
 
 class MEDIA_EXPORT FFmpegDemuxer : public Demuxer, public FFmpegURLProtocol {
  public:
-  explicit FFmpegDemuxer(MessageLoop* message_loop);
+  FFmpegDemuxer(MessageLoop* message_loop, bool local_source);
   virtual ~FFmpegDemuxer();
 
   // Posts a task to perform additional demuxing.
   virtual void PostDemuxTask();
 
   void Initialize(
       DataSource* data_source, const PipelineStatusCB& callback);
 
   // Demuxer implementation.
   virtual void Stop(const base::Closure& callback) OVERRIDE;
   virtual void Seek(base::TimeDelta time, const FilterStatusCB& cb) OVERRIDE;
   virtual void OnAudioRendererDisabled() OVERRIDE;
   virtual void set_host(FilterHost* filter_host) OVERRIDE;
   virtual void SetPlaybackRate(float playback_rate) OVERRIDE;
   virtual scoped_refptr<DemuxerStream> GetStream(
       DemuxerStream::Type type) OVERRIDE;
   virtual void SetPreload(Preload preload) OVERRIDE;
   virtual base::TimeDelta GetStartTime() const OVERRIDE;
   virtual int GetBitrate() OVERRIDE;
+  virtual bool IsLocalSource() OVERRIDE;
+  virtual bool IsSeekable() OVERRIDE;
 
   // FFmpegURLProtocol implementation.
   virtual size_t Read(size_t size, uint8* data) OVERRIDE;
   virtual bool GetPosition(int64* position_out) OVERRIDE;
   virtual bool SetPosition(int64 position) OVERRIDE;
   virtual bool GetSize(int64* size_out) OVERRIDE;
   virtual bool IsStreaming() OVERRIDE;
 
   // Provide access to FFmpegDemuxerStream.
   MessageLoop* message_loop();
@@ skipping 40 matching lines @@
   void OnReadCompleted(size_t size);
 
   // Wait for asynchronous read to complete and return number of bytes read.
   virtual size_t WaitForRead();
 
   // Signal that read has completed, and |size| bytes have been read.
   virtual void SignalReadCompleted(size_t size);
 
   MessageLoop* message_loop_;
 
+  // True if the media is a local resource, false if the media require network
+  // access to be loaded.
+  bool local_source_;
+
   // FFmpeg context handle.
   AVFormatContext* format_context_;
 
   // Two vector of streams:
   //   - |streams_| is indexed by type for the Demuxer interface GetStream(),
   //     and contains NULLs for types which aren't present.
   //   - |packet_streams_| is indexed to mirror AVFormatContext when dealing
   //     with AVPackets returned from av_read_frame() and contain NULL entries
   //     representing unsupported streams where we throw away the data.
   //
@@ skipping 34 matching lines @@
   // starting clock value to match the timestamps in the media file. Default
   // is 0.
   base::TimeDelta start_time_;
 
   DISALLOW_COPY_AND_ASSIGN(FFmpegDemuxer);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_FILTERS_FFMPEG_DEMUXER_H_