media/base/demuxer.h

   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 MEDIA_EXPORT DemuxerHost : public DataSourceHost {
  19  public:
  20   // Sets the duration of the media in microseconds.
  21   // Duration may be kInfiniteDuration() if the duration is not known.
  22   virtual void SetDuration(base::TimeDelta duration) = 0;
  23
  24   // Stops execution of the pipeline due to a fatal error.  Do not call this
  25   // method with PIPELINE_OK.
  26   virtual void OnDemuxerError(PipelineStatus error) = 0;
  27
  28  protected:
  29   virtual ~DemuxerHost();
  30 };
  31
  32 class MEDIA_EXPORT Demuxer {
  33  public:
  34   // A new potentially encrypted stream has been parsed.
  35   // First parameter - The type of initialization data.
  36   // Second parameter - The initialization data associated with the stream.
  37   typedef base::Callback<void(const std::string& type,
  38                               const std::vector<uint8>& init_data)> NeedKeyCB;
  39
  40   Demuxer();
  41   virtual ~Demuxer();
  42
  43   // Completes initialization of the demuxer.
  44   //
  45   // The demuxer does not own |host| as it is guaranteed to outlive the
  46   // lifetime of the demuxer. Don't delete it!
  47   virtual void Initialize(DemuxerHost* host,
  48                           const PipelineStatusCB& status_cb) = 0;
  49
  50   // Carry out any actions required to seek to the given time, executing the
  51   // callback upon completion.
  52   virtual void Seek(base::TimeDelta time,
  53                     const PipelineStatusCB& status_cb) = 0;
  54
  55   // Starts stopping this demuxer, executing the callback upon completion.
  56   //
  57   // After the callback completes the demuxer may be destroyed. It is illegal to
  58   // call any method (including Stop()) after a demuxer has stopped.
  59   virtual void Stop(const base::Closure& callback) = 0;
  60
  61   // This method is called from the pipeline when the audio renderer
  62   // is disabled. Demuxers can ignore the notification if they do not
  63   // need to react to this event.
  64   //
  65   // TODO(acolwell): Change to generic DisableStream(DemuxerStream::Type).
  66   // TODO(scherkus): this might not be needed http://crbug.com/234708
  67   virtual void OnAudioRendererDisabled() = 0;
  68
  69   // Returns the given stream type, or NULL if that type is not present.
  70   virtual DemuxerStream* GetStream(DemuxerStream::Type type) = 0;
  71
  72   // Returns the starting time for the media file.
  73   virtual base::TimeDelta GetStartTime() const = 0;
  74
  75  private:
  76   DISALLOW_COPY_AND_ASSIGN(Demuxer);
  77 };
  78
  79 }  // namespace media
  80
  81 #endif  // MEDIA_BASE_DEMUXER_H_