media/base/android/audio_decoder_job.h

   1 // Copyright 2013 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_AUDIO_DECODER_JOB_H_
   6 #define MEDIA_BASE_ANDROID_AUDIO_DECODER_JOB_H_
   7
   8 #include <jni.h>
   9 #include <vector>
  10
  11 #include "base/callback.h"
  12 #include "media/base/android/media_decoder_job.h"
  13
  14 namespace media {
  15
  16 class AudioCodecBridge;
  17 class AudioTimestampHelper;
  18
  19 // Class for managing audio decoding jobs.
  20 class AudioDecoderJob : public MediaDecoderJob {
  21  public:
  22   // Creates a new AudioDecoderJob instance for decoding audio.
  23   // |request_data_cb| - Callback used to request more data for the decoder.
  24   // |on_demuxer_config_changed_cb| - Callback used to inform the caller that
  25   // demuxer config has changed.
  26   AudioDecoderJob(const base::Closure& request_data_cb,
  27                   const base::Closure& on_demuxer_config_changed_cb);
  28   ~AudioDecoderJob() override;
  29
  30   // MediaDecoderJob implementation.
  31   bool HasStream() const override;
  32   void Flush() override;
  33   void SetDemuxerConfigs(const DemuxerConfigs& configs) override;
  34
  35   // Sets the volume of the audio output.
  36   void SetVolume(double volume);
  37   double volume() const { return volume_; }
  38
  39   // Sets the base timestamp for |audio_timestamp_helper_|.
  40   void SetBaseTimestamp(base::TimeDelta base_timestamp);
  41
  42  private:
  43   // MediaDecoderJob implementation.
  44   void ReleaseOutputBuffer(
  45       int output_buffer_index,
  46       size_t size,
  47       bool render_output,
  48       base::TimeDelta current_presentation_timestamp,
  49       const ReleaseOutputCompletionCallback& callback) override;
  50   bool ComputeTimeToRender() const override;
  51   bool AreDemuxerConfigsChanged(const DemuxerConfigs& configs) const override;
  52   MediaDecoderJobStatus CreateMediaCodecBridgeInternal() override;
  53   void OnOutputFormatChanged() override;
  54
  55   // Helper method to set the audio output volume.
  56   void SetVolumeInternal();
  57
  58   void ResetTimestampHelper();
  59
  60   // Audio configs from the demuxer.
  61   AudioCodec audio_codec_;
  62   int num_channels_;
  63   int config_sampling_rate_;
  64   std::vector<uint8> audio_extra_data_;
  65   int64 audio_codec_delay_ns_;
  66   int64 audio_seek_preroll_ns_;
  67   double volume_;
  68   int bytes_per_frame_;
  69
  70   // Audio output sample rate
  71   int output_sampling_rate_;
  72
  73   // Frame count to sync with audio codec output
  74   int64 frame_count_;
  75
  76   // Base timestamp for the |audio_timestamp_helper_|.
  77   base::TimeDelta base_timestamp_;
  78
  79   // Object to calculate the current audio timestamp for A/V sync.
  80   scoped_ptr<AudioTimestampHelper> audio_timestamp_helper_;
  81
  82   DISALLOW_COPY_AND_ASSIGN(AudioDecoderJob);
  83 };
  84
  85 }  // namespace media
  86
  87 #endif  // MEDIA_BASE_ANDROID_AUDIO_DECODER_JOB_H_