media/formats/mp2t/es_parser_adts.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_ADTS_H_
   6 #define MEDIA_FORMATS_MP2T_ES_PARSER_ADTS_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/formats/mp2t/es_parser.h"
  18
  19 namespace media {
  20 class AudioTimestampHelper;
  21 class BitReader;
  22 class OffsetByteQueue;
  23 class StreamParserBuffer;
  24 }
  25
  26 namespace media {
  27 namespace mp2t {
  28
  29 class MEDIA_EXPORT EsParserAdts : public EsParser {
  30  public:
  31   typedef base::Callback<void(const AudioDecoderConfig&)> NewAudioConfigCB;
  32
  33   EsParserAdts(const NewAudioConfigCB& new_audio_config_cb,
  34                const EmitBufferCB& emit_buffer_cb,
  35                bool sbr_in_mimetype);
  36   ~EsParserAdts() override;
  37
  38   // EsParser implementation.
  39   void Flush() override;
  40
  41  private:
  42   struct AdtsFrame;
  43
  44   // EsParser implementation.
  45   bool ParseFromEsQueue() override;
  46   void ResetInternal() override;
  47
  48   // Synchronize the stream on an ADTS syncword (consuming bytes from
  49   // |es_queue_| if needed).
  50   // Returns true when a full ADTS frame has been found: in that case
  51   // |adts_frame| structure is filled up accordingly.
  52   // Returns false otherwise (no ADTS syncword found or partial ADTS frame).
  53   bool LookForAdtsFrame(AdtsFrame* adts_frame);
  54
  55   // Skip an ADTS frame in the ES queue.
  56   void SkipAdtsFrame(const AdtsFrame& adts_frame);
  57
  58   // Signal any audio configuration change (if any).
  59   // Return false if the current audio config is not
  60   // a supported ADTS audio config.
  61   bool UpdateAudioConfiguration(const uint8* adts_header);
  62
  63   // Callbacks:
  64   // - to signal a new audio configuration,
  65   // - to send ES buffers.
  66   NewAudioConfigCB new_audio_config_cb_;
  67   EmitBufferCB emit_buffer_cb_;
  68
  69   // True when AAC SBR extension is signalled in the mimetype
  70   // (mp4a.40.5 in the codecs parameter).
  71   bool sbr_in_mimetype_;
  72
  73   // Interpolated PTS for frames that don't have one.
  74   scoped_ptr<AudioTimestampHelper> audio_timestamp_helper_;
  75
  76   // Last audio config.
  77   AudioDecoderConfig last_audio_decoder_config_;
  78
  79   DISALLOW_COPY_AND_ASSIGN(EsParserAdts);
  80 };
  81
  82 }  // namespace mp2t
  83 }  // namespace media
  84
  85 #endif