Render inband text tracks in the media pipeline

media/filters/ffmpeg_demuxer.h

 // Copyright (c) 2012 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 16 matching lines @@
 
 #include "base/callback.h"
 #include "base/gtest_prod_util.h"
 #include "base/memory/scoped_vector.h"
 #include "base/threading/thread.h"
 #include "media/base/audio_decoder_config.h"
 #include "media/base/decoder_buffer.h"
 #include "media/base/decoder_buffer_queue.h"
 #include "media/base/demuxer.h"
 #include "media/base/pipeline.h"
+#include "media/base/text_track.h"
 #include "media/base/video_decoder_config.h"
 #include "media/filters/blocking_url_protocol.h"
 
 // FFmpeg forward declarations.
 struct AVPacket;
 struct AVRational;
 struct AVStream;
 
 namespace media {
 
+// Indicate to the player that an inband text track has been detected in
+// the media. The |index| refers to the index of the stream.
+typedef base::Callback<void(TextKind kind,
+                            const std::string& label,
+                            const std::string& language,
+                            int index)> FFmpegAddTextTrackCB;
+
 class MediaLog;
 class FFmpegDemuxer;
 class FFmpegGlue;
 class FFmpegH264ToAnnexBBitstreamConverter;
 class ScopedPtrAVFreePacket;
 
 typedef scoped_ptr_malloc<AVPacket, ScopedPtrAVFreePacket> ScopedAVPacket;
 
 class FFmpegDemuxerStream : public DemuxerStream {
  public:
@@ skipping 67 matching lines @@
   std::string encryption_key_id_;
 
   DISALLOW_COPY_AND_ASSIGN(FFmpegDemuxerStream);
 };
 
 class MEDIA_EXPORT FFmpegDemuxer : public Demuxer {
  public:
   FFmpegDemuxer(const scoped_refptr<base::MessageLoopProxy>& message_loop,
                 DataSource* data_source,
                 const NeedKeyCB& need_key_cb,
+                const FFmpegAddTextTrackCB& add_text_track_cb,
                 const scoped_refptr<MediaLog>& media_log);
   virtual ~FFmpegDemuxer();
 
   // Demuxer implementation.
   virtual void Initialize(DemuxerHost* host,
                           const PipelineStatusCB& status_cb) OVERRIDE;
   virtual void Stop(const base::Closure& callback) OVERRIDE;
   virtual void Seek(base::TimeDelta time, const PipelineStatusCB& cb) OVERRIDE;
   virtual void OnAudioRendererDisabled() OVERRIDE;
   virtual void SetPlaybackRate(float playback_rate) OVERRIDE;
   virtual DemuxerStream* GetStream(DemuxerStream::Type type) OVERRIDE;
+  virtual int GetStreamCount() const OVERRIDE;
+  virtual DemuxerStream* GetStreamByIndex(int index) OVERRIDE;
   virtual base::TimeDelta GetStartTime() const OVERRIDE;
 
   // Calls |need_key_cb_| with the initialization data encountered in the file.
   void FireNeedKey(const std::string& init_data_type,
                    const std::string& encryption_key_id);
 
   // Allow FFmpegDemuxerStream to notify us when there is updated information
   // about capacity and what buffered data is available.
   void NotifyCapacityAvailable();
   void NotifyBufferingChanged();
@@ skipping 81 matching lines @@
 
   // Set if we know duration of the audio stream. Used when processing end of
   // stream -- at this moment we definitely know duration.
   bool duration_known_;
 
   // FFmpegURLProtocol implementation and corresponding glue bits.
   BlockingUrlProtocol url_protocol_;
   scoped_ptr<FFmpegGlue> glue_;
 
   const NeedKeyCB need_key_cb_;
+  const FFmpegAddTextTrackCB add_text_track_cb_;
 
   DISALLOW_COPY_AND_ASSIGN(FFmpegDemuxer);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_FILTERS_FFMPEG_DEMUXER_H_