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
  10 #include "media/base/android/media_decoder_job.h"
  11
  12 namespace media {
  13
  14 class AudioCodecBridge;
  15 class AudioTimestampHelper;
  16
  17 // Class for managing audio decoding jobs.
  18 class AudioDecoderJob : public MediaDecoderJob {
  19  public:
  20   virtual ~AudioDecoderJob();
  21
  22   // Creates a new AudioDecoderJob instance for decoding audio.
  23   // |audio_codec| - The audio format the object needs to decode.
  24   // |sample_rate| - The sample rate of the decoded output.
  25   // |channel_count| - The number of channels in the decoded output.
  26   // |extra_data|, |extra_data_size| - Extra data buffer needed for initializing
  27   // the decoder.
  28   // |media_crypto| - Handle to a Java object that handles the encryption for
  29   // the audio data.
  30   // |request_data_cb| - Callback used to request more data for the decoder.
  31   static AudioDecoderJob* Create(
  32       const AudioCodec audio_codec, int sample_rate, int channel_count,
  33       const uint8* extra_data, size_t extra_data_size, jobject media_crypto,
  34       const base::Closure& request_data_cb);
  35
  36   void SetVolume(double volume);
  37
  38   // Sets the base timestamp for |audio_timestamp_helper_|.
  39   void SetBaseTimestamp(base::TimeDelta base_timestamp);
  40
  41  private:
  42   AudioDecoderJob(scoped_ptr<AudioTimestampHelper> audio_timestamp_helper,
  43                   scoped_ptr<AudioCodecBridge> audio_decoder_bridge,
  44                   int bytes_per_frame,
  45                   const base::Closure& request_data_cb);
  46
  47   // MediaDecoderJob implementation.
  48   virtual void ReleaseOutputBuffer(
  49       int output_buffer_index,
  50       size_t size,
  51       bool render_output,
  52       base::TimeDelta current_presentation_timestamp,
  53       const ReleaseOutputCompletionCallback& callback) OVERRIDE;
  54
  55   virtual bool ComputeTimeToRender() const OVERRIDE;
  56
  57   // number of bytes per audio frame;
  58   int bytes_per_frame_;
  59
  60   scoped_ptr<AudioCodecBridge> audio_codec_bridge_;
  61
  62   // Object to calculate the current audio timestamp for A/V sync.
  63   scoped_ptr<AudioTimestampHelper> audio_timestamp_helper_;
  64 };
  65
  66 }  // namespace media
  67
  68 #endif  // MEDIA_BASE_ANDROID_AUDIO_DECODER_JOB_H_