Audio and video decoders for MediaCodecPlayer

media/base/android/media_codec_audio_decoder.h

+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef MEDIA_BASE_ANDROID_MEDIA_CODEC_AUDIO_DECODER_H_
+#define MEDIA_BASE_ANDROID_MEDIA_CODEC_AUDIO_DECODER_H_
+
+#include "media/base/android/media_codec_decoder.h"
+
+namespace media {
+
+class AudioTimestampHelper;
+
+// Audio decoder for MediaCodecPlayer
+class MediaCodecAudioDecoder : public MediaCodecDecoder {
+ public:
+  // For parameters see media_codec_decoder.h
+  // update_current_time_cb: callback that reports current playback time.
+  //                         Called for each rendered frame.
+  MediaCodecAudioDecoder(
+      const scoped_refptr<base::SingleThreadTaskRunner>& media_runner,
+      const base::Closure& request_data_cb,
+      const base::Closure& starvation_cb,
+      const base::Closure& stop_done_cb,
+      const base::Closure& error_cb,
+      const SetTimeCallback& update_current_time_cb);
+  ~MediaCodecAudioDecoder() override;
+
+  const char* class_name() const override;
+
+  bool HasStream() const override;
+  void SetDemuxerConfigs(const DemuxerConfigs& configs) override;
+  void Flush() override;
+
+  // Sets the volume of the audio output.
+  void SetVolume(double volume);
+
+  // Sets the base timestamp for |audio_timestamp_helper_|.
+  void SetBaseTimestamp(base::TimeDelta base_timestamp);
+
+ protected:
+  bool IsCodecReconfigureNeeded(const DemuxerConfigs& curr,
+                                const DemuxerConfigs& next) const override;
+  ConfigStatus ConfigureInternal() override;
+  void OnOutputFormatChanged() override;
+  void Render(int buffer_index,
+              size_t size,
+              bool render_output,
+              base::TimeDelta pts,
+              bool eos_encountered) override;
+
+ private:
+  // A helper method to set the volume.
+  void SetVolumeInternal();
+
+  // Recreates |audio_timestamp_helper_|, called when sampling rate is changed.
+  void ResetTimestampHelper();
+
+  // Data.
+
+  // Configuration received from demuxer
+  DemuxerConfigs configs_;
+
+  // Requested volume
+  double volume_;
+
+  // Number of bytes per audio frame. Depends on the output format and the
+  // number of channels.
+  int bytes_per_frame_;
+
+  // The sampling rate received from decoder.
+  int output_sampling_rate_;
+
+  // Frame count to sync with audio codec output.
+  int64 frame_count_;
+
+  // Base timestamp for the |audio_timestamp_helper_|.
+  base::TimeDelta base_timestamp_;
+
+  // Object to calculate the current audio timestamp for A/V sync.
+  scoped_ptr<AudioTimestampHelper> audio_timestamp_helper_;
+
+  // Reports current playback time to the callee.
+  SetTimeCallback update_current_time_cb_;
+
+  DISALLOW_COPY_AND_ASSIGN(MediaCodecAudioDecoder);
+};
+
+}  // namespace media
+
+#endif  // MEDIA_BASE_ANDROID_MEDIA_CODEC_DECODER_H_