media/base/android/media_codec_audio_decoder.h

   1 // Copyright 2015 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_BASE_ANDROID_MEDIA_CODEC_AUDIO_DECODER_H_
   6 #define MEDIA_BASE_ANDROID_MEDIA_CODEC_AUDIO_DECODER_H_
   7
   8 #include "media/base/android/media_codec_decoder.h"
   9
  10 namespace media {
  11
  12 class AudioTimestampHelper;
  13
  14 // Audio decoder for MediaCodecPlayer
  15 class MediaCodecAudioDecoder : public MediaCodecDecoder {
  16  public:
  17   // For parameters see media_codec_decoder.h
  18   // update_current_time_cb: callback that reports current playback time.
  19   //                         Called for each rendered frame.
  20   MediaCodecAudioDecoder(
  21       const scoped_refptr<base::SingleThreadTaskRunner>& media_runner,
  22       const base::Closure& request_data_cb,
  23       const base::Closure& starvation_cb,
  24       const base::Closure& stop_done_cb,
  25       const base::Closure& error_cb,
  26       const SetTimeCallback& update_current_time_cb);
  27   ~MediaCodecAudioDecoder() override;
  28
  29   const char* class_name() const override;
  30
  31   bool HasStream() const override;
  32   void SetDemuxerConfigs(const DemuxerConfigs& configs) override;
  33   void Flush() override;
  34
  35   // Sets the volume of the audio output.
  36   void SetVolume(double volume);
  37
  38   // Sets the base timestamp for |audio_timestamp_helper_|.
  39   void SetBaseTimestamp(base::TimeDelta base_timestamp);
  40
  41  protected:
  42   bool IsCodecReconfigureNeeded(const DemuxerConfigs& curr,
  43                                 const DemuxerConfigs& next) const override;
  44   ConfigStatus ConfigureInternal() override;
  45   void OnOutputFormatChanged() override;
  46   void Render(int buffer_index,
  47               size_t size,
  48               bool render_output,
  49               base::TimeDelta pts,
  50               bool eos_encountered) override;
  51
  52  private:
  53   // A helper method to set the volume.
  54   void SetVolumeInternal();
  55
  56   // Recreates |audio_timestamp_helper_|, called when sampling rate is changed.
  57   void ResetTimestampHelper();
  58
  59   // Data.
  60
  61   // Configuration received from demuxer
  62   DemuxerConfigs configs_;
  63
  64   // Requested volume
  65   double volume_;
  66
  67   // Number of bytes per audio frame. Depends on the output format and the
  68   // number of channels.
  69   int bytes_per_frame_;
  70
  71   // The sampling rate received from decoder.
  72   int output_sampling_rate_;
  73
  74   // Frame count to sync with audio codec output.
  75   int64 frame_count_;
  76
  77   // Base timestamp for the |audio_timestamp_helper_|.
  78   base::TimeDelta base_timestamp_;
  79
  80   // Object to calculate the current audio timestamp for A/V sync.
  81   scoped_ptr<AudioTimestampHelper> audio_timestamp_helper_;
  82
  83   // Reports current playback time to the callee.
  84   SetTimeCallback update_current_time_cb_;
  85
  86   DISALLOW_COPY_AND_ASSIGN(MediaCodecAudioDecoder);
  87 };
  88
  89 }  // namespace media
  90
  91 #endif  // MEDIA_BASE_ANDROID_MEDIA_CODEC_DECODER_H_