blob: 0cb25fd0b64c908416ebef7b770d282ba1090fac [file] [log] [blame]
// 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.
#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;
class VideoFrameFactory;
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> {
VideoSender(scoped_refptr<CastEnvironment> cast_environment,
const VideoSenderConfig& video_config,
const StatusChangeCallback& status_change_cb,
const CreateVideoEncodeAcceleratorCallback& create_vea_cb,
const CreateVideoEncodeMemoryCallback& create_video_encode_mem_cb,
CastTransportSender* const transport_sender,
const PlayoutDelayChangeCB& playout_delay_change_cb);
~VideoSender() override;
// 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.
void InsertRawVideoFrame(const scoped_refptr<media::VideoFrame>& video_frame,
const base::TimeTicks& reference_time);
// Creates a |VideoFrameFactory| object to vend |VideoFrame| object with
// encoder affinity (defined as offering some sort of performance benefit). If
// the encoder does not have any such capability, returns null.
scoped_ptr<VideoFrameFactory> CreateVideoFrameFactory();
int GetNumberOfFramesInEncoder() const override;
base::TimeDelta GetInFlightMediaDuration() const override;
void OnAck(uint32 frame_id) override;
// 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_|.
RtpTimestamp last_enqueued_frame_rtp_timestamp_;
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_;
} // namespace cast
} // namespace media