Support MPEG1 audio in the MPEG2-TS stream parser.

media/formats/mp2t/es_parser_mpeg1audio.h

 // Copyright 2014 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_FORMATS_MP2T_ES_PARSER_ADTS_H_
-#define MEDIA_FORMATS_MP2T_ES_PARSER_ADTS_H_
+#ifndef MEDIA_FORMATS_MP2T_ES_PARSER_MPEG1AUDIO_H_
+#define MEDIA_FORMATS_MP2T_ES_PARSER_MPEG1AUDIO_H_
 
 #include <list>
 #include <utility>
 
 #include "base/callback.h"
 #include "base/compiler_specific.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/time/time.h"
 #include "media/base/audio_decoder_config.h"
 #include "media/base/media_export.h"
 #include "media/formats/mp2t/es_parser.h"
 
 namespace media {
 class AudioTimestampHelper;
 class BitReader;
 class OffsetByteQueue;
 class StreamParserBuffer;
 }
 
 namespace media {
 namespace mp2t {
 
-class MEDIA_EXPORT EsParserAdts : public EsParser {
+class MEDIA_EXPORT EsParserMpeg1Audio : public EsParser {
  public:
   typedef base::Callback<void(const AudioDecoderConfig&)> NewAudioConfigCB;
 
-  EsParserAdts(const NewAudioConfigCB& new_audio_config_cb,
-               const EmitBufferCB& emit_buffer_cb,
-               bool sbr_in_mimetype);
-  virtual ~EsParserAdts();
+  EsParserMpeg1Audio(const NewAudioConfigCB& new_audio_config_cb,
+                     const EmitBufferCB& emit_buffer_cb);
+  virtual ~EsParserMpeg1Audio();
 
   // EsParser implementation.
   virtual void Flush() OVERRIDE;
 
  private:
-  struct AdtsFrame;
+  // Used to link a PTS with a byte position in the ES stream.
+  typedef std::pair<int64, base::TimeDelta> EsPts;
+  typedef std::list<EsPts> EsPtsList;
+
+  struct Mpeg1AudioFrame;
 
   // EsParser implementation.
   virtual bool ParseFromEsQueue() OVERRIDE;
   virtual void ResetInternal() OVERRIDE;
 
-  // Synchronize the stream on an ADTS syncword (consuming bytes from
+  // Synchronize the stream on a Mpeg1 audio syncword (consuming bytes from
   // |es_queue_| if needed).
-  // Returns true when a full ADTS frame has been found: in that case
-  // |adts_frame| structure is filled up accordingly.
-  // Returns false otherwise (no ADTS syncword found or partial ADTS frame).
-  bool LookForAdtsFrame(AdtsFrame* adts_frame);
-
-  // Skip an ADTS frame in the ES queue.
-  void SkipAdtsFrame(const AdtsFrame& adts_frame);
+  // Returns true when a full Mpeg1 audio frame has been found: in that case
+  // |mpeg1audio_frame| structure is filled up accordingly.
+  // Returns false otherwise (no Mpeg1 audio syncword found or partial Mpeg1
+  // audio frame).
+  bool LookForMpeg1AudioFrame(Mpeg1AudioFrame* mpeg1audio_frame);
 
   // Signal any audio configuration change (if any).
   // Return false if the current audio config is not
-  // a supported ADTS audio config.
-  bool UpdateAudioConfiguration(const uint8* adts_header);
+  // a supported Mpeg1 audio config.
+  bool UpdateAudioConfiguration(const uint8* mpeg1audio_header);
+
+  void SkipMpeg1AudioFrame(const Mpeg1AudioFrame& mpeg1audio_frame);
 
   // Callbacks:
   // - to signal a new audio configuration,
   // - to send ES buffers.
   NewAudioConfigCB new_audio_config_cb_;
   EmitBufferCB emit_buffer_cb_;
 
-  // True when AAC SBR extension is signalled in the mimetype
-  // (mp4a.40.5 in the codecs parameter).
-  bool sbr_in_mimetype_;
-
   // Interpolated PTS for frames that don't have one.
   scoped_ptr<AudioTimestampHelper> audio_timestamp_helper_;
 
   // Last audio config.
   AudioDecoderConfig last_audio_decoder_config_;
 
-  DISALLOW_COPY_AND_ASSIGN(EsParserAdts);
+  DISALLOW_COPY_AND_ASSIGN(EsParserMpeg1Audio);
 };
 
 }  // namespace mp2t
 }  // namespace media
 
-#endif
+#endif  // MEDIA_FORMATS_MP2T_ES_PARSER_MPEG1AUDIO_H_