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/callback_forward.h"
+#include "base/memory/ref_counted.h"
+#include "media/base/audio_decoder_config.h"
+#include "media/base/buffers.h"
+#include "media/base/byte_queue.h"
+#include "media/base/stream_parser.h"
+#include "media/base/video_decoder_config.h"
+#include "media/mp4/box_definitions.h"
+#include "media/mp4/track_run_iterator.h"
+
+namespace media {
+
+namespace mp4 {
+class BoxReader;
+}

[acolwell GONE FROM CHROMIUM, 2012/06/06 17:32:39]

Remove }. Lets keep the MP4StreamParser in the mp4 namespace.

[strobe_, 2012/06/07 16:33:54]

Done.

+
+using mp4::BoxReader;

[acolwell GONE FROM CHROMIUM, 2012/06/06 17:32:39]

remove since everything is in the mp4 namespace now.

[strobe_, 2012/06/07 16:33:54]

Done.

+
+// A wrapper around a ByteQueue which maintains a notion of a
+// monotonically-increasing offset. All buffer access is done by passing these
+// offsets into this class, going some way towards preventing the proliferation
+// of many different meanings of "offset", "head", etc.
+class OffsetByteQueue {
+ public:
+  OffsetByteQueue();
+  ~OffsetByteQueue();
+
+  // These work like their underlying ByteQueue counterparts.
+  void Reset();
+  void Push(const uint8* buf, size_t size);
+  void Peek(const uint8** buf, size_t* size);
+  void Pop(size_t count);
+
+  // Sets 'buf' to point at the first buffered byte corresponding to 'offset',
+  // and 'size' to the number of bytes available starting from that offset.
+  //
+  // It is an error if the offset is before the current head. It's not an error
+  // if the current offset is beyond tail(), but you will of course get back
+  // '*buf==NULL' and '*size==0'.

[acolwell GONE FROM CHROMIUM, 2012/06/06 17:32:39]

Use || when referring to parameters. ie |buf| == NULL

[strobe_, 2012/06/07 16:33:54]

Done.

+  void PeekAt(size_t offset, const uint8** buf, size_t* size);
+
+  // Marks the bytes up to 'max_offset' as ready for deletion. This is
+  // relatively inexpensive, but will not necessarily reduce the resident
+  // buffer size right away (or ever).
+  //
+  // Returns 'true' if the full range of bytes were successfully trimmed;
+  // 'false' if the max offset was greater than the end of the buffer.
+  //
+  // It is OK if 'max_offset' is less than the current head; the request will be
+  // ignored.
+  bool Trim(size_t max_offset);
+
+  // The head and tail positions
+  size_t head() { return head_; }
+  size_t tail() { return head_ + size_; }
+
+ private:
+  // Synchronize buf_ and size_ with queue_.
+  void Sync();
+
+  ByteQueue queue_;
+  const uint8* buf_;
+  size_t size_;
+  size_t head_;
+
+  DISALLOW_COPY_AND_ASSIGN(OffsetByteQueue);
+};
+
+// This class is essentially identical in structure to the WebM parser and
+// the common bits should be factored before it lands.
+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(BoxReader* r);

[acolwell GONE FROM CHROMIUM, 2012/06/06 17:32:39]

r -> reader here and elsewhere

[strobe_, 2012/06/07 16:33:54]

Done.

+  bool ParseMoof(BoxReader* r);
+
+  bool ReadMDATsUntil(const size_t 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

[acolwell GONE FROM CHROMIUM, 2012/06/06 17:32:39]

Use ||

[strobe_, 2012/06/07 16:33:54]

Done.

+  // block. All byte offsets in sample information are relative to this offset,
+  // as mandated by the Media Source spec.
+  size_t moof_head_;
+  // 'mdat_tail_' is the offset of the end of the

[acolwell GONE FROM CHROMIUM, 2012/06/06 17:32:39]

Use ||

[strobe_, 2012/06/07 16:33:54]

Done.

+  size_t mdat_tail_;
+
+  mp4::TrackRunIterator runs_;
+
+  scoped_ptr<mp4::Movie> moov_;
+
+  bool has_audio_;
+  bool has_video_;
+  uint32 audio_track_id_;
+  uint32 video_track_id_;
+
+  // 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 media
+
+#endif  // MEDIA_MP4_MP4_STREAM_PARSER_H_