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// 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_AV_PIPELINE_IMPL_H_
#define CHROMECAST_MEDIA_CMA_BASE_AV_PIPELINE_IMPL_H_
#include <list>
#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/base/cast_decoder_buffer_impl.h"
#include "chromecast/public/media/media_pipeline_backend.h"
#include "chromecast/public/media/stream_id.h"
namespace media {
class AudioDecoderConfig;
class VideoDecoderConfig;
}
namespace chromecast {
namespace media {
class BrowserCdmCast;
class BufferingFrameProvider;
class BufferingState;
class CodedFrameProvider;
class DecoderBufferBase;
class AvPipelineImpl {
public:
// Pipeline states.
enum State {
kUninitialized,
kPlaying,
kFlushing,
kFlushed,
kStopped,
kError,
};
typedef base::Callback<
void(StreamId id,
const ::media::AudioDecoderConfig&,
const ::media::VideoDecoderConfig&)> UpdateConfigCB;
AvPipelineImpl(MediaPipelineBackend::Decoder* decoder,
const UpdateConfigCB& update_config_cb);
~AvPipelineImpl();
// Setting the frame provider or the client must be done in the
// |kUninitialized| state.
void SetCodedFrameProvider(scoped_ptr<CodedFrameProvider> frame_provider,
size_t max_buffer_size,
size_t max_frame_size);
// Setup the pipeline and ensure samples are available for the given media
// time, then start rendering samples.
bool StartPlayingFrom(base::TimeDelta time,
const scoped_refptr<BufferingState>& buffering_state);
// Flush any remaining samples in the pipeline.
// Invoke |done_cb| when flush is completed.
void Flush(const base::Closure& done_cb);
// Tear down the pipeline and release the hardware resources.
void Stop();
State GetState() const { return state_; }
void TransitionToState(State state);
void SetCdm(BrowserCdmCast* media_keys);
void OnBufferPushed(MediaPipelineBackend::BufferStatus status);
private:
// Callback invoked when the CDM state has changed in a way that might
// impact media playback.
void OnCdmStateChange();
// Feed the pipeline, getting the frames from |frame_provider_|.
void FetchBufferIfNeeded();
// Callback invoked when receiving a new frame from |frame_provider_|.
void OnNewFrame(const scoped_refptr<DecoderBufferBase>& buffer,
const ::media::AudioDecoderConfig& audio_config,
const ::media::VideoDecoderConfig& video_config);
// Process a pending buffer.
void ProcessPendingBuffer();
// Callbacks:
// - when BrowserCdm updated its state.
// - when BrowserCdm has been destroyed.
void OnCdmStateChanged();
void OnCdmDestroyed();
// Callback invoked when a media buffer has been buffered by |frame_provider_|
// which is a BufferingFrameProvider.
void OnDataBuffered(const scoped_refptr<DecoderBufferBase>& buffer,
bool is_at_max_capacity);
void UpdatePlayableFrames();
base::ThreadChecker thread_checker_;
UpdateConfigCB update_config_cb_;
// Backends.
MediaPipelineBackend::Decoder* decoder_;
// AV pipeline state.
State state_;
// Buffering state.
// Can be NULL if there is no buffering strategy.
scoped_refptr<BufferingState> buffering_state_;
// |buffered_time_| is the maximum timestamp of buffered frames.
// |playable_buffered_time_| is the maximum timestamp of buffered and
// playable frames (i.e. the key id is available for those frames).
base::TimeDelta buffered_time_;
base::TimeDelta playable_buffered_time_;
// List of frames buffered but not playable right away due to a missing
// key id.
std::list<scoped_refptr<DecoderBufferBase> > non_playable_frames_;
// Buffer provider.
scoped_ptr<BufferingFrameProvider> frame_provider_;
// Indicate whether the frame fetching process is active.
bool enable_feeding_;
// Indicate whether there is a pending buffer read.
bool pending_read_;
// Pending buffer (not pushed to device yet)
scoped_refptr<DecoderBufferBase> pending_buffer_;
// Buffer that has been pushed to the device but not processed yet.
CastDecoderBufferImpl pushed_buffer_;
// The media time is retrieved at regular intervals.
// Indicate whether time update is enabled.
bool enable_time_update_;
bool pending_time_update_task_;
// Decryption keys, if available.
BrowserCdmCast* media_keys_;
int media_keys_callback_id_;
base::WeakPtr<AvPipelineImpl> weak_this_;
base::WeakPtrFactory<AvPipelineImpl> weak_factory_;
DISALLOW_COPY_AND_ASSIGN(AvPipelineImpl);
};
} // namespace media
} // namespace chromecast
#endif // CHROMECAST_MEDIA_CMA_BASE_AV_PIPELINE_IMPL_H_
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