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& decoder_drained_cb,
  25       const base::Closure& stop_done_cb,
  26       const base::Closure& error_cb,
  27       const SetTimeCallback& update_current_time_cb);
  28   ~MediaCodecAudioDecoder() override;
  29
  30   const char* class_name() const override;
  31
  32   bool HasStream() const override;
  33   void SetDemuxerConfigs(const DemuxerConfigs& configs) override;
  34   void ReleaseDecoderResources() override;
  35   void Flush() override;
  36
  37   // Sets the volume of the audio output.
  38   void SetVolume(double volume);
  39
  40   // Sets the base timestamp for |audio_timestamp_helper_|.
  41   void SetBaseTimestamp(base::TimeDelta base_timestamp);
  42
  43  protected:
  44   bool IsCodecReconfigureNeeded(const DemuxerConfigs& next) const override;
  45   ConfigStatus ConfigureInternal() override;
  46   void OnOutputFormatChanged() override;
  47   void Render(int buffer_index,
  48               size_t offset,
  49               size_t size,
  50               RenderMode render_mode,
  51               base::TimeDelta pts,
  52               bool eos_encountered) override;
  53
  54  private:
  55   // A helper method to set the volume.
  56   void SetVolumeInternal();
  57
  58   // Recreates |audio_timestamp_helper_|, called when sampling rate is changed.
  59   void ResetTimestampHelper();
  60
  61   // Data.
  62
  63   // Configuration received from demuxer
  64   DemuxerConfigs configs_;
  65
  66   // Requested volume
  67   double volume_;
  68
  69   // Number of bytes per audio frame. Depends on the output format and the
  70   // number of channels.
  71   int bytes_per_frame_;
  72
  73   // The sampling rate received from decoder.
  74   int output_sampling_rate_;
  75
  76   // Frame count to sync with audio codec output.
  77   int64 frame_count_;
  78
  79   // Base timestamp for the |audio_timestamp_helper_|.
  80   base::TimeDelta base_timestamp_;
  81
  82   // Object to calculate the current audio timestamp for A/V sync.
  83   scoped_ptr<AudioTimestampHelper> audio_timestamp_helper_;
  84
  85   // Reports current playback time to the callee.
  86   SetTimeCallback update_current_time_cb_;
  87
  88   DISALLOW_COPY_AND_ASSIGN(MediaCodecAudioDecoder);
  89 };
  90
  91 }  // namespace media
  92
  93 #endif  // MEDIA_BASE_ANDROID_MEDIA_CODEC_DECODER_H_