Implement ISO BMFF support in Media Source.

media/mp4/mp4_stream_parser.h

+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef MEDIA_MP4_MP4_STREAM_PARSER_H_
+#define MEDIA_MP4_MP4_STREAM_PARSER_H_
+
+#include "base/basictypes.h"
+#include "base/callback.h"
+#include "base/compiler_specific.h"
+#include "base/memory/scoped_ptr.h"
+#include "media/base/stream_parser.h"
+#include "media/mp4/offset_byte_queue.h"
+#include "media/mp4/track_run_iterator.h"
+
+namespace media {
+namespace mp4 {
+
+struct Movie;
+class BoxReader;
+
+class MP4StreamParser : public StreamParser {
+ public:
+  MP4StreamParser();
+  virtual ~MP4StreamParser();
+
+  virtual void Init(const InitCB& init_cb, const NewConfigCB& config_cb,
+                    const NewBuffersCB& audio_cb,
+                    const NewBuffersCB& video_cb,
+                    const KeyNeededCB& key_needed_cb) OVERRIDE;
+  virtual void Flush() OVERRIDE;
+  virtual bool Parse(const uint8* buf, int size) OVERRIDE;
+
+ private:
+  enum State {
+    kWaitingForInit,
+    kParsingBoxes,
+    kEmittingSamples,
+    kError
+  };
+
+  bool ParseBox(bool* err);
+  bool ParseMoov(mp4::BoxReader* reader);
+  bool ParseMoof(mp4::BoxReader* reader);
+
+  bool ReadMDATsUntil(const int64 tgt_tail);
+
+  void ChangeState(State new_state);
+
+  bool EmitConfigs();
+  bool EnqueueSample(BufferQueue* audio_buffers,
+                     BufferQueue* video_buffers,
+                     bool* err);
+
+  State state_;
+  InitCB init_cb_;
+  NewConfigCB config_cb_;
+  NewBuffersCB audio_cb_;
+  NewBuffersCB video_cb_;
+  KeyNeededCB key_needed_cb_;
+
+  OffsetByteQueue queue_;
+
+  // These two parameters are only valid in the |kEmittingSegments| state.
+  //
+  // |moof_head_| is the offset of the start of the most recently parsed moof
+  // block. All byte offsets in sample information are relative to this offset,
+  // as mandated by the Media Source spec.
+  int64 moof_head_;
+  // |mdat_tail_| is the stream offset of the end of the current 'mdat' box.
+  // Valid iff it is greater than the head of the queue.
+  int64 mdat_tail_;
+
+  mp4::TrackRunIterator runs_;
+
+  scoped_ptr<mp4::Movie> moov_;
+
+  bool has_audio_;
+  bool has_video_;
+  uint32 audio_track_id_;
+  uint32 video_track_id_;
+  bool parameter_sets_inserted_;
+
+  // We keep this around to avoid having to go digging through the moov with
+  // every frame.
+  uint8 size_of_nalu_length_;
+
+  DISALLOW_COPY_AND_ASSIGN(MP4StreamParser);
+};
+
+}  // namespace mp4
+}  // namespace media
+
+#endif  // MEDIA_MP4_MP4_STREAM_PARSER_H_