Home | History | Annotate | Download | only in base 
      1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #ifndef MEDIA_BASE_DEMUXER_H_
      6 #define MEDIA_BASE_DEMUXER_H_
      7 
      8 #include <vector>
      9 
     10 #include "base/time/time.h"
     11 #include "media/base/data_source.h"
     12 #include "media/base/demuxer_stream.h"
     13 #include "media/base/media_export.h"
     14 #include "media/base/pipeline_status.h"
     15 
     16 namespace media {
     17 
     18 class TextTrackConfig;
     19 
     20 class MEDIA_EXPORT DemuxerHost : public DataSourceHost {
     21  public:
     22   // Sets the duration of the media in microseconds.
     23   // Duration may be kInfiniteDuration() if the duration is not known.
     24   virtual void SetDuration(base::TimeDelta duration) = 0;
     25 
     26   // Stops execution of the pipeline due to a fatal error.  Do not call this
     27   // method with PIPELINE_OK.
     28   virtual void OnDemuxerError(PipelineStatus error) = 0;
     29 
     30   // Add |text_stream| to the collection managed by the text renderer.
     31   virtual void AddTextStream(DemuxerStream* text_stream,
     32                              const TextTrackConfig& config) = 0;
     33 
     34   // Remove |text_stream| from the presentation.
     35   virtual void RemoveTextStream(DemuxerStream* text_stream) = 0;
     36 
     37  protected:
     38   virtual ~DemuxerHost();
     39 };
     40 
     41 class MEDIA_EXPORT Demuxer {
     42  public:
     43   // A new potentially encrypted stream has been parsed.
     44   // First parameter - The type of initialization data.
     45   // Second parameter - The initialization data associated with the stream.
     46   typedef base::Callback<void(const std::string& type,
     47                               const std::vector<uint8>& init_data)> NeedKeyCB;
     48 
     49   Demuxer();
     50   virtual ~Demuxer();
     51 
     52   // Completes initialization of the demuxer.
     53   //
     54   // The demuxer does not own |host| as it is guaranteed to outlive the
     55   // lifetime of the demuxer. Don't delete it!
     56   virtual void Initialize(DemuxerHost* host,
     57                           const PipelineStatusCB& status_cb,
     58                           bool enable_text_tracks) = 0;
     59 
     60   // Carry out any actions required to seek to the given time, executing the
     61   // callback upon completion.
     62   virtual void Seek(base::TimeDelta time,
     63                     const PipelineStatusCB& status_cb) = 0;
     64 
     65   // Starts stopping this demuxer, executing the callback upon completion.
     66   //
     67   // After the callback completes the demuxer may be destroyed. It is illegal to
     68   // call any method (including Stop()) after a demuxer has stopped.
     69   virtual void Stop(const base::Closure& callback) = 0;
     70 
     71   // This method is called from the pipeline when the audio renderer
     72   // is disabled. Demuxers can ignore the notification if they do not
     73   // need to react to this event.
     74   //
     75   // TODO(acolwell): Change to generic DisableStream(DemuxerStream::Type).
     76   // TODO(scherkus): this might not be needed http://crbug.com/234708
     77   virtual void OnAudioRendererDisabled() = 0;
     78 
     79   // Returns the first stream of the given stream type (which is not allowed
     80   // to be DemuxerStream::TEXT), or NULL if that type of stream is not present.
     81   virtual DemuxerStream* GetStream(DemuxerStream::Type type) = 0;
     82 
     83   // Returns the starting time for the media file.
     84   virtual base::TimeDelta GetStartTime() const = 0;
     85 
     86  private:
     87   DISALLOW_COPY_AND_ASSIGN(Demuxer);
     88 };
     89 
     90 }  // namespace media
     91 
     92 #endif  // MEDIA_BASE_DEMUXER_H_
     93