media/formats/mp2t/es_parser_mpeg1audio.h

   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_MP2T_ES_PARSER_MPEG1AUDIO_H_
   6 #define MEDIA_FORMATS_MP2T_ES_PARSER_MPEG1AUDIO_H_
   7
   8 #include <list>
   9 #include <utility>
  10
  11 #include "base/callback.h"
  12 #include "base/compiler_specific.h"
  13 #include "base/memory/scoped_ptr.h"
  14 #include "base/time/time.h"
  15 #include "media/base/audio_decoder_config.h"
  16 #include "media/base/media_export.h"
  17 #include "media/base/media_log.h"
  18 #include "media/formats/mp2t/es_parser.h"
  19
  20 namespace media {
  21 class AudioTimestampHelper;
  22 class BitReader;
  23 class OffsetByteQueue;
  24 class StreamParserBuffer;
  25 }
  26
  27 namespace media {
  28 namespace mp2t {
  29
  30 class MEDIA_EXPORT EsParserMpeg1Audio : public EsParser {
  31  public:
  32   typedef base::Callback<void(const AudioDecoderConfig&)> NewAudioConfigCB;
  33
  34   EsParserMpeg1Audio(const NewAudioConfigCB& new_audio_config_cb,
  35                      const EmitBufferCB& emit_buffer_cb,
  36                      const LogCB& log_cb);
  37   ~EsParserMpeg1Audio() override;
  38
  39   // EsParser implementation.
  40   void Flush() override;
  41
  42  private:
  43   // Used to link a PTS with a byte position in the ES stream.
  44   typedef std::pair<int64, base::TimeDelta> EsPts;
  45   typedef std::list<EsPts> EsPtsList;
  46
  47   struct Mpeg1AudioFrame;
  48
  49   // EsParser implementation.
  50   bool ParseFromEsQueue() override;
  51   void ResetInternal() override;
  52
  53   // Synchronize the stream on a Mpeg1 audio syncword (consuming bytes from
  54   // |es_queue_| if needed).
  55   // Returns true when a full Mpeg1 audio frame has been found: in that case
  56   // |mpeg1audio_frame| structure is filled up accordingly.
  57   // Returns false otherwise (no Mpeg1 audio syncword found or partial Mpeg1
  58   // audio frame).
  59   bool LookForMpeg1AudioFrame(Mpeg1AudioFrame* mpeg1audio_frame);
  60
  61   // Signal any audio configuration change (if any).
  62   // Return false if the current audio config is not
  63   // a supported Mpeg1 audio config.
  64   bool UpdateAudioConfiguration(const uint8* mpeg1audio_header);
  65
  66   void SkipMpeg1AudioFrame(const Mpeg1AudioFrame& mpeg1audio_frame);
  67
  68   LogCB log_cb_;
  69
  70   // Callbacks:
  71   // - to signal a new audio configuration,
  72   // - to send ES buffers.
  73   NewAudioConfigCB new_audio_config_cb_;
  74   EmitBufferCB emit_buffer_cb_;
  75
  76   // Interpolated PTS for frames that don't have one.
  77   scoped_ptr<AudioTimestampHelper> audio_timestamp_helper_;
  78
  79   // Last audio config.
  80   AudioDecoderConfig last_audio_decoder_config_;
  81
  82   DISALLOW_COPY_AND_ASSIGN(EsParserMpeg1Audio);
  83 };
  84
  85 }  // namespace mp2t
  86 }  // namespace media
  87
  88 #endif  // MEDIA_FORMATS_MP2T_ES_PARSER_MPEG1AUDIO_H_