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