Mpeg2 TS stream parser for media source.

media/mp2t/mp2t_stream_parser.h

+// Copyright (c) 2013 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_MP2T_MP2T_STREAM_PARSER_H_
+#define MEDIA_MP2T_MP2T_STREAM_PARSER_H_
+
+#include <list>
+#include <map>
+
+#include "base/memory/ref_counted.h"
+#include "base/memory/scoped_ptr.h"
+#include "media/base/audio_decoder_config.h"
+#include "media/base/byte_queue.h"
+#include "media/base/media_export.h"
+#include "media/base/stream_parser.h"
+#include "media/base/video_decoder_config.h"
+
+namespace media {
+
+class StreamParserBuffer;
+
+namespace mp2t {
+
+class PidState;
+
+class MEDIA_EXPORT Mp2tStreamParser : public StreamParser {
+ public:
+  Mp2tStreamParser();
+  virtual ~Mp2tStreamParser();
+
+  // StreamParser implementation.
+  virtual void Init(const InitCB& init_cb,
+                    const NewConfigCB& config_cb,
+                    const NewBuffersCB& new_buffers_cb,
+                    const NewTextBuffersCB& text_cb,
+                    const NeedKeyCB& need_key_cb,
+                    const AddTextTrackCB& add_text_track_cb,
+                    const NewMediaSegmentCB& new_segment_cb,
+                    const base::Closure& end_of_segment_cb,
+                    const LogCB& log_cb) OVERRIDE;
+  virtual void Flush() OVERRIDE;
+  virtual bool Parse(const uint8* buf, int size) OVERRIDE;
+
+ private:
+  typedef std::map<int, PidState*> PidMap;
+
+  struct BufferQueueWithConfig {
+    bool is_config_sent;
+    AudioDecoderConfig audio_config;
+    StreamParser::BufferQueue audio_queue;
+    VideoDecoderConfig video_config;
+    StreamParser::BufferQueue video_queue;
+  };
+
+  // Callback invoked to register a Program Map Table.
+  // Note: Does nothing if the PID is already registered.
+  void RegisterPmt(int program_number, int pmt_pid);
+
+  // Callback invoked to register a PES pid.
+  // Possible values for |stream_type| are defined in:
+  // ISO-13818.1 / ITU H.222 Table 2.34 "Stream type assignments".
+  // |pes_pid| is part of the Program Map Table refered by |pmt_pid|.
+  void RegisterPes(int pmt_pid, int pes_pid, int stream_type);
+
+  // Since the StreamParser interface allows only one audio & video streams,
+  // an automatic PID filtering should be applied to select the audio & video
+  // streams.
+  void UpdatePidFilter();
+
+  // Callback invoked each time the audio/video decoder configuration is
+  // changed.
+  void OnVideoConfigChanged(int pes_pid,
+                            const VideoDecoderConfig& video_decoder_config);
+  void OnAudioConfigChanged(int pes_pid,
+                            const AudioDecoderConfig& audio_decoder_config);
+
+  // Invoke the initialization callback if needed.
+  bool FinishInitializationIfNeeded();
+
+  // Callback invoked by the ES stream parser
+  // to emit a new audio/video access unit.
+  void OnEmitAudioBuffer(
+      int pes_pid,
+      scoped_refptr<StreamParserBuffer> stream_parser_buffer);
+  void OnEmitVideoBuffer(
+      int pes_pid,
+      scoped_refptr<StreamParserBuffer> stream_parser_buffer);
+  bool EmitRemainingBuffers();
+
+  // List of callbacks.
+  InitCB init_cb_;
+  NewConfigCB config_cb_;
+  NewBuffersCB new_buffers_cb_;
+  NeedKeyCB need_key_cb_;
+  NewMediaSegmentCB new_segment_cb_;
+  base::Closure end_of_segment_cb_;
+  LogCB log_cb_;
+
+  // Bytes of the TS stream.
+  ByteQueue ts_byte_queue_;
+
+  // List of PIDs and their state.
+  PidMap pids_;
+
+  // Selected audio and video PIDs.
+  int selected_audio_pid_;
+  int selected_video_pid_;
+
+  // Pending audio & video buffers.
+  std::list<BufferQueueWithConfig> buffer_queue_chain_;
+
+  // Last audio and video decoder config sent.
+  AudioDecoderConfig last_audio_config_;
+  VideoDecoderConfig last_video_config_;
+
+  // Whether |init_cb_| has been invoked.
+  bool is_initialized_;
+
+  // Indicate whether a segment was started.
+  bool segment_started_;
+  bool first_video_frame_in_segment_;
+  base::TimeDelta time_offset_;
+
+  DISALLOW_COPY_AND_ASSIGN(Mp2tStreamParser);
+};
+
+}  // namespace mp2t
+}  // namespace media
+
+#endif
+