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/demuxer_stream_provider.h"
  14 #include "media/base/media_export.h"
  15 #include "media/base/pipeline_status.h"
  16
  17 namespace media {
  18
  19 class TextTrackConfig;
  20
  21 class MEDIA_EXPORT DemuxerHost {
  22  public:
  23   // Notify the host that time range [start,end] has been buffered.
  24   virtual void AddBufferedTimeRange(base::TimeDelta start,
  25                                     base::TimeDelta end) = 0;
  26
  27   // Sets the duration of the media in microseconds.
  28   // Duration may be kInfiniteDuration() if the duration is not known.
  29   virtual void SetDuration(base::TimeDelta duration) = 0;
  30
  31   // Stops execution of the pipeline due to a fatal error.  Do not call this
  32   // method with PIPELINE_OK.
  33   virtual void OnDemuxerError(PipelineStatus error) = 0;
  34
  35   // Add |text_stream| to the collection managed by the text renderer.
  36   virtual void AddTextStream(DemuxerStream* text_stream,
  37                              const TextTrackConfig& config) = 0;
  38
  39   // Remove |text_stream| from the presentation.
  40   virtual void RemoveTextStream(DemuxerStream* text_stream) = 0;
  41
  42  protected:
  43   virtual ~DemuxerHost();
  44 };
  45
  46 class MEDIA_EXPORT Demuxer : public DemuxerStreamProvider {
  47  public:
  48   // A new potentially encrypted stream has been parsed.
  49   // First parameter - The type of initialization data.
  50   // Second parameter - The initialization data associated with the stream.
  51   typedef base::Callback<void(const std::string& type,
  52                               const std::vector<uint8>& init_data)>
  53       EncryptedMediaInitDataCB;
  54
  55   Demuxer();
  56   ~Demuxer() override;
  57
  58   // Completes initialization of the demuxer.
  59   //
  60   // The demuxer does not own |host| as it is guaranteed to outlive the
  61   // lifetime of the demuxer. Don't delete it!  |status_cb| must only be run
  62   // after this method has returned.
  63   virtual void Initialize(DemuxerHost* host,
  64                           const PipelineStatusCB& status_cb,
  65                           bool enable_text_tracks) = 0;
  66
  67   // Carry out any actions required to seek to the given time, executing the
  68   // callback upon completion.
  69   virtual void Seek(base::TimeDelta time,
  70                     const PipelineStatusCB& status_cb) = 0;
  71
  72   // Stops this demuxer.
  73   //
  74   // After this call the demuxer may be destroyed. It is illegal to call any
  75   // method (including Stop()) after a demuxer has stopped.
  76   virtual void Stop() = 0;
  77
  78   // Returns the starting time for the media file; it's always positive.
  79   virtual base::TimeDelta GetStartTime() const = 0;
  80
  81   // Returns Time represented by presentation timestamp 0.
  82   // If the timstamps are not associated with a Time, then
  83   // a null Time is returned.
  84   virtual base::Time GetTimelineOffset() const = 0;
  85
  86  private:
  87   DISALLOW_COPY_AND_ASSIGN(Demuxer);
  88 };
  89
  90 }  // namespace media
  91
  92 #endif  // MEDIA_BASE_DEMUXER_H_