mp4_stream_parser.h revision 5d1f7b1de12d16ceb2c938c56701a3e8bfa558f7 
1// Copyright 2014 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_FORMATS_MP4_MP4_STREAM_PARSER_H_
6#define MEDIA_FORMATS_MP4_MP4_STREAM_PARSER_H_
7
8#include <set>
9#include <vector>
10
11#include "base/basictypes.h"
12#include "base/callback.h"
13#include "base/compiler_specific.h"
14#include "base/memory/scoped_ptr.h"
15#include "media/base/media_export.h"
16#include "media/base/stream_parser.h"
17#include "media/formats/common/offset_byte_queue.h"
18#include "media/formats/mp4/track_run_iterator.h"
19
20namespace media {
21namespace mp4 {
22
23struct Movie;
24class BoxReader;
25
26class MEDIA_EXPORT MP4StreamParser : public StreamParser {
27 public:
28  MP4StreamParser(const std::set<int>& audio_object_types, bool has_sbr);
29  virtual ~MP4StreamParser();
30
31  virtual void Init(const InitCB& init_cb, const NewConfigCB& config_cb,
32                    const NewBuffersCB& new_buffers_cb,
33                    bool ignore_text_tracks,
34                    const NeedKeyCB& need_key_cb,
35                    const NewMediaSegmentCB& new_segment_cb,
36                    const base::Closure& end_of_segment_cb,
37                    const LogCB& log_cb) OVERRIDE;
38  virtual void Flush() OVERRIDE;
39  virtual bool Parse(const uint8* buf, int size) OVERRIDE;
40
41 private:
42  enum State {
43    kWaitingForInit,
44    kParsingBoxes,
45    kEmittingSamples,
46    kError
47  };
48
49  bool ParseBox(bool* err);
50  bool ParseMoov(mp4::BoxReader* reader);
51  bool ParseMoof(mp4::BoxReader* reader);
52
53  void EmitNeedKeyIfNecessary(
54      const std::vector<ProtectionSystemSpecificHeader>& headers);
55
56  // To retain proper framing, each 'mdat' atom must be read; to limit memory
57  // usage, the atom's data needs to be discarded incrementally as frames are
58  // extracted from the stream. This function discards data from the stream up
59  // to |offset|, updating the |mdat_tail_| value so that framing can be
60  // retained after all 'mdat' information has been read.
61  // Returns 'true' on success, 'false' if there was an error.
62  bool ReadAndDiscardMDATsUntil(const int64 offset);
63
64  void ChangeState(State new_state);
65
66  bool EmitConfigs();
67  bool PrepareAVCBuffer(const AVCDecoderConfigurationRecord& avc_config,
68                        std::vector<uint8>* frame_buf,
69                        std::vector<SubsampleEntry>* subsamples) const;
70  bool PrepareAACBuffer(const AAC& aac_config,
71                        std::vector<uint8>* frame_buf,
72                        std::vector<SubsampleEntry>* subsamples) const;
73  bool EnqueueSample(BufferQueue* audio_buffers,
74                     BufferQueue* video_buffers,
75                     bool* err);
76  bool SendAndFlushSamples(BufferQueue* audio_buffers,
77                           BufferQueue* video_buffers);
78
79  void Reset();
80
81  State state_;
82  InitCB init_cb_;
83  NewConfigCB config_cb_;
84  NewBuffersCB new_buffers_cb_;
85  NeedKeyCB need_key_cb_;
86  NewMediaSegmentCB new_segment_cb_;
87  base::Closure end_of_segment_cb_;
88  LogCB log_cb_;
89
90  OffsetByteQueue queue_;
91
92  // These two parameters are only valid in the |kEmittingSegments| state.
93  //
94  // |moof_head_| is the offset of the start of the most recently parsed moof
95  // block. All byte offsets in sample information are relative to this offset,
96  // as mandated by the Media Source spec.
97  int64 moof_head_;
98  // |mdat_tail_| is the stream offset of the end of the current 'mdat' box.
99  // Valid iff it is greater than the head of the queue.
100  int64 mdat_tail_;
101
102  scoped_ptr<mp4::Movie> moov_;
103  scoped_ptr<mp4::TrackRunIterator> runs_;
104
105  bool has_audio_;
106  bool has_video_;
107  uint32 audio_track_id_;
108  uint32 video_track_id_;
109  // The object types allowed for audio tracks.
110  std::set<int> audio_object_types_;
111  bool has_sbr_;
112  bool is_audio_track_encrypted_;
113  bool is_video_track_encrypted_;
114
115  DISALLOW_COPY_AND_ASSIGN(MP4StreamParser);
116};
117
118}  // namespace mp4
119}  // namespace media
120
121#endif  // MEDIA_FORMATS_MP4_MP4_STREAM_PARSER_H_
122