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/formats/mp2t/es_parser.h"
  17
  18 namespace media {
  19 class AudioTimestampHelper;
  20 class BitReader;
  21 class OffsetByteQueue;
  22 class StreamParserBuffer;
  23 }
  24
  25 namespace media {
  26 namespace mp2t {
  27
  28 class EsParserAdts : public EsParser {
  29  public:
  30   typedef base::Callback<void(const AudioDecoderConfig&)> NewAudioConfigCB;
  31
  32   EsParserAdts(const NewAudioConfigCB& new_audio_config_cb,
  33                const EmitBufferCB& emit_buffer_cb,
  34                bool sbr_in_mimetype);
  35   virtual ~EsParserAdts();
  36
  37   // EsParser implementation.
  38   virtual bool Parse(const uint8* buf, int size,
  39                      base::TimeDelta pts,
  40                      base::TimeDelta dts) OVERRIDE;
  41   virtual void Flush() OVERRIDE;
  42   virtual void Reset() OVERRIDE;
  43
  44  private:
  45   // Used to link a PTS with a byte position in the ES stream.
  46   typedef std::pair<int64, base::TimeDelta> EsPts;
  47   typedef std::list<EsPts> EsPtsList;
  48
  49   struct AdtsFrame;
  50
  51   // Synchronize the stream on an ADTS syncword (consuming bytes from
  52   // |es_queue_| if needed).
  53   // Returns true when a full ADTS frame has been found: in that case
  54   // |adts_frame| structure is filled up accordingly.
  55   // Returns false otherwise (no ADTS syncword found or partial ADTS frame).
  56   bool LookForAdtsFrame(AdtsFrame* adts_frame);
  57
  58   // Skip an ADTS frame in the ES queue.
  59   void SkipAdtsFrame(const AdtsFrame& adts_frame);
  60
  61   // Signal any audio configuration change (if any).
  62   // Return false if the current audio config is not
  63   // a supported ADTS audio config.
  64   bool UpdateAudioConfiguration(const uint8* adts_header);
  65
  66   // Callbacks:
  67   // - to signal a new audio configuration,
  68   // - to send ES buffers.
  69   NewAudioConfigCB new_audio_config_cb_;
  70   EmitBufferCB emit_buffer_cb_;
  71
  72   // True when AAC SBR extension is signalled in the mimetype
  73   // (mp4a.40.5 in the codecs parameter).
  74   bool sbr_in_mimetype_;
  75
  76   // Bytes of the ES stream that have not been emitted yet.
  77   scoped_ptr<media::OffsetByteQueue> es_queue_;
  78
  79   // List of PTS associated with a position in the ES stream.
  80   EsPtsList pts_list_;
  81
  82   // Interpolated PTS for frames that don't have one.
  83   scoped_ptr<AudioTimestampHelper> audio_timestamp_helper_;
  84
  85   // Last audio config.
  86   AudioDecoderConfig last_audio_decoder_config_;
  87
  88   DISALLOW_COPY_AND_ASSIGN(EsParserAdts);
  89 };
  90
  91 }  // namespace mp2t
  92 }  // namespace media
  93
  94 #endif
  95