Chromecast: adds a media pipeline feeding data to CMA device backends.

chromecast/media/cma/pipeline/audio_pipeline_impl.h

+// Copyright 2014 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 CHROMECAST_MEDIA_CMA_BASE_AUDIO_PIPELINE_IMPL_H_
+#define CHROMECAST_MEDIA_CMA_BASE_AUDIO_PIPELINE_IMPL_H_
+
+#include "base/callback.h"
+#include "base/macros.h"
+#include "base/memory/ref_counted.h"
+#include "base/memory/weak_ptr.h"
+#include "base/threading/thread_checker.h"
+#include "chromecast/media/cma/pipeline/audio_pipeline.h"
+#include "chromecast/media/cma/pipeline/av_pipeline_client.h"
+
+namespace media {
+class AudioDecoderConfig;
+class VideoDecoderConfig;
+}
+
+namespace chromecast {
+namespace media {
+class AudioPipelineDevice;
+class AvPipelineImpl;
+class BrowserCdmCast;
+class BufferingState;
+class CodedFrameProvider;
+
+class AudioPipelineImpl : public AudioPipeline {
+ public:
+  // |buffering_controller| can be NULL.
+  explicit AudioPipelineImpl(AudioPipelineDevice* audio_device);
+  ~AudioPipelineImpl() override;
+
+  // Input port of the pipeline.
+  void SetCodedFrameProvider(scoped_ptr<CodedFrameProvider> frame_provider);
+
+  // Provide the CDM to use to decrypt samples.
+  void SetCdm(BrowserCdmCast* media_keys);
+
+  // Functions to control the state of the audio pipeline.
+  void Initialize(
+      const ::media::AudioDecoderConfig& config,
+      scoped_ptr<CodedFrameProvider> frame_provider,
+      const ::media::PipelineStatusCB& status_cb);
+  bool StartPlayingFrom(base::TimeDelta time,
+                        const scoped_refptr<BufferingState>& buffering_state);
+  void Flush(const ::media::PipelineStatusCB& status_cb);
+  void Stop();
+
+  // Update the playback statistics for this audio stream.
+  void UpdateStatistics();
+
+  // AudioPipeline implementation.
+  void SetClient(const AvPipelineClient& client) override;
+  void SetVolume(float volume) override;
+
+ private:
+  void OnFlushDone(const ::media::PipelineStatusCB& status_cb);
+  void OnUpdateConfig(const ::media::AudioDecoderConfig& audio_config,
+                      const ::media::VideoDecoderConfig& video_config);
+
+  AudioPipelineDevice* audio_device_;
+
+  scoped_ptr<AvPipelineImpl> av_pipeline_impl_;
+  AvPipelineClient audio_client_;
+
+  ::media::PipelineStatistics previous_stats_;
+
+  base::WeakPtrFactory<AudioPipelineImpl> weak_factory_;
+  base::WeakPtr<AudioPipelineImpl> weak_this_;
+
+  DISALLOW_COPY_AND_ASSIGN(AudioPipelineImpl);
+};
+
+}  // namespace media
+}  // namespace chromecast
+
+#endif  // CHROMECAST_MEDIA_CMA_BASE_AUDIO_PIPELINE_IMPL_H_