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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 MEDIA_CAST_SENDER_VIDEO_SENDER_H_
#define MEDIA_CAST_SENDER_VIDEO_SENDER_H_
#include "base/callback.h"
#include "base/memory/ref_counted.h"
#include "base/memory/scoped_ptr.h"
#include "base/memory/weak_ptr.h"
#include "base/threading/non_thread_safe.h"
#include "base/time/tick_clock.h"
#include "base/time/time.h"
#include "media/cast/cast_config.h"
#include "media/cast/sender/congestion_control.h"
#include "media/cast/sender/frame_sender.h"
namespace media {
class VideoFrame;
namespace cast {
class CastTransportSender;
class VideoEncoder;
typedef base::Callback<void(base::TimeDelta)> PlayoutDelayChangeCB;
// Not thread safe. Only called from the main cast thread.
// This class owns all objects related to sending video, objects that create RTP
// packets, congestion control, video encoder, parsing and sending of
// RTCP packets.
// Additionally it posts a bunch of delayed tasks to the main thread for various
// timeouts.
class VideoSender : public FrameSender,
public base::NonThreadSafe,
public base::SupportsWeakPtr<VideoSender> {
public:
VideoSender(scoped_refptr<CastEnvironment> cast_environment,
const VideoSenderConfig& video_config,
const CastInitializationCallback& initialization_cb,
const CreateVideoEncodeAcceleratorCallback& create_vea_cb,
const CreateVideoEncodeMemoryCallback& create_video_encode_mem_cb,
CastTransportSender* const transport_sender,
const PlayoutDelayChangeCB& playout_delay_change_cb);
virtual ~VideoSender();
// Note: It is not guaranteed that |video_frame| will actually be encoded and
// sent, if VideoSender detects too many frames in flight. Therefore, clients
// should be careful about the rate at which this method is called.
//
// Note: It is invalid to call this method if InitializationResult() returns
// anything but STATUS_VIDEO_INITIALIZED.
void InsertRawVideoFrame(const scoped_refptr<media::VideoFrame>& video_frame,
const base::TimeTicks& capture_time);
protected:
virtual int GetNumberOfFramesInEncoder() const override;
virtual base::TimeDelta GetInFlightMediaDuration() const override;
virtual void OnAck(uint32 frame_id) override;
private:
// Called when the encoder is initialized or has failed to initialize.
void OnEncoderInitialized(
const CastInitializationCallback& initialization_cb,
CastInitializationStatus status);
// Called by the |video_encoder_| with the next EncodedFrame to send.
void OnEncodedVideoFrame(int encoder_bitrate,
scoped_ptr<EncodedFrame> encoded_frame);
// Encodes media::VideoFrame images into EncodedFrames. Per configuration,
// this will point to either the internal software-based encoder or a proxy to
// a hardware-based encoder.
scoped_ptr<VideoEncoder> video_encoder_;
// The number of frames queued for encoding, but not yet sent.
int frames_in_encoder_;
// The duration of video queued for encoding, but not yet sent.
base::TimeDelta duration_in_encoder_;
// The timestamp of the frame that was last enqueued in |video_encoder_|.
base::TimeTicks last_enqueued_frame_reference_time_;
// Remember what we set the bitrate to before, no need to set it again if
// we get the same value.
uint32 last_bitrate_;
PlayoutDelayChangeCB playout_delay_change_cb_;
// NOTE: Weak pointers must be invalidated before all other member variables.
base::WeakPtrFactory<VideoSender> weak_factory_;
DISALLOW_COPY_AND_ASSIGN(VideoSender);
};
} // namespace cast
} // namespace media
#endif // MEDIA_CAST_SENDER_VIDEO_SENDER_H_
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