media/mp4/track_run_iterator.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_MP4_TRACK_RUN_ITERATOR_H_
   6 #define MEDIA_MP4_TRACK_RUN_ITERATOR_H_
   7
   8 #include <vector>
   9
  10 #include "base/memory/scoped_ptr.h"
  11 #include "base/time/time.h"
  12 #include "media/base/media_export.h"
  13 #include "media/base/media_log.h"
  14 #include "media/mp4/box_definitions.h"
  15 #include "media/mp4/cenc.h"
  16
  17 namespace media {
  18
  19 class DecryptConfig;
  20
  21 namespace mp4 {
  22
  23 using base::TimeDelta;
  24 base::TimeDelta MEDIA_EXPORT TimeDeltaFromRational(int64 numer, int64 denom);
  25
  26 struct SampleInfo;
  27 struct TrackRunInfo;
  28
  29 class MEDIA_EXPORT TrackRunIterator {
  30  public:
  31   // Create a new TrackRunIterator. A reference to |moov| will be retained for
  32   // the lifetime of this object.
  33   TrackRunIterator(const Movie* moov, const LogCB& log_cb);
  34   ~TrackRunIterator();
  35
  36   // Sets up the iterator to handle all the runs from the current fragment.
  37   bool Init(const MovieFragment& moof);
  38
  39   // Returns true if the properties of the current run or sample are valid.
  40   bool IsRunValid() const;
  41   bool IsSampleValid() const;
  42
  43   // Advance the properties to refer to the next run or sample. Requires that
  44   // the current sample be valid.
  45   void AdvanceRun();
  46   void AdvanceSample();
  47
  48   // Returns true if this track run has auxiliary information and has not yet
  49   // been cached. Only valid if IsRunValid().
  50   bool AuxInfoNeedsToBeCached();
  51
  52   // Caches the CENC data from the given buffer. |buf| must be a buffer starting
  53   // at the offset given by cenc_offset(), with a |size| of at least
  54   // cenc_size(). Returns true on success, false on error.
  55   bool CacheAuxInfo(const uint8* buf, int size);
  56
  57   // Returns the maximum buffer location at which no data earlier in the stream
  58   // will be required in order to read the current or any subsequent sample. You
  59   // may clear all data up to this offset before reading the current sample
  60   // safely. Result is in the same units as offset() (for Media Source this is
  61   // in bytes past the the head of the MOOF box).
  62   int64 GetMaxClearOffset();
  63
  64   // Property of the current run. Only valid if IsRunValid().
  65   uint32 track_id() const;
  66   int64 aux_info_offset() const;
  67   int aux_info_size() const;
  68   bool is_encrypted() const;
  69   bool is_audio() const;
  70   // Only one is valid, based on the value of is_audio().
  71   const AudioSampleEntry& audio_description() const;
  72   const VideoSampleEntry& video_description() const;
  73
  74   // Properties of the current sample. Only valid if IsSampleValid().
  75   int64 sample_offset() const;
  76   int sample_size() const;
  77   TimeDelta dts() const;
  78   TimeDelta cts() const;
  79   TimeDelta duration() const;
  80   bool is_keyframe() const;
  81
  82   // Only call when is_encrypted() is true and AuxInfoNeedsToBeCached() is
  83   // false. Result is owned by caller.
  84   scoped_ptr<DecryptConfig> GetDecryptConfig();
  85
  86  private:
  87   void ResetRun();
  88   const TrackEncryption& track_encryption() const;
  89
  90   const Movie* moov_;
  91   LogCB log_cb_;
  92
  93   std::vector<TrackRunInfo> runs_;
  94   std::vector<TrackRunInfo>::const_iterator run_itr_;
  95   std::vector<SampleInfo>::const_iterator sample_itr_;
  96
  97   std::vector<FrameCENCInfo> cenc_info_;
  98
  99   int64 sample_dts_;
 100   int64 sample_offset_;
 101
 102   DISALLOW_COPY_AND_ASSIGN(TrackRunIterator);
 103 };
 104
 105 }  // namespace mp4
 106 }  // namespace media
 107
 108 #endif  // MEDIA_MP4_TRACK_RUN_ITERATOR_H_