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// Copyright 2013 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "third_party/blink/public/web/modules/mediastream/media_stream_video_sink.h"
#include "third_party/blink/renderer/modules/mediastream/media_stream_video_track.h"
#include "third_party/blink/renderer/platform/mediastream/media_stream_component.h"
namespace blink {
namespace {
// Calls to these methods must be done on the main render thread.
// Note that |callback| for frame delivery happens on the video task runner.
// Warning: Calling RemoveSinkFromMediaStreamTrack does not immediately stop
// frame delivery through the |callback|, since frames are being delivered on
// a different thread.
// |is_sink_secure| indicates if |sink| meets output protection requirement.
// Generally, this should be false unless you know what you are doing.
void AddSinkToMediaStreamTrack(const WebMediaStreamTrack& track,
WebMediaStreamSink* sink,
const VideoCaptureDeliverFrameCB& callback,
MediaStreamVideoSink::IsSecure is_secure,
MediaStreamVideoSink::UsesAlpha uses_alpha) {
static_cast<MediaStreamComponent*>(track)->AddSink(sink, callback, is_secure,
uses_alpha);
}
void RemoveSinkFromMediaStreamTrack(const WebMediaStreamTrack& track,
WebMediaStreamSink* sink) {
MediaStreamVideoTrack* const video_track = MediaStreamVideoTrack::From(track);
if (video_track)
video_track->RemoveSink(sink);
}
} // namespace
MediaStreamVideoSink::MediaStreamVideoSink() : WebMediaStreamSink() {}
MediaStreamVideoSink::~MediaStreamVideoSink() {
// Ensure this sink has disconnected from the track.
DisconnectFromTrack();
}
void MediaStreamVideoSink::ConnectToTrack(
const WebMediaStreamTrack& track,
const VideoCaptureDeliverFrameCB& callback,
MediaStreamVideoSink::IsSecure is_secure,
MediaStreamVideoSink::UsesAlpha uses_alpha) {
DCHECK(connected_track_.IsNull());
connected_track_ = track;
AddSinkToMediaStreamTrack(track, this, callback, is_secure, uses_alpha);
}
void MediaStreamVideoSink::ConnectEncodedToTrack(
const WebMediaStreamTrack& track,
const EncodedVideoFrameCB& callback) {
DCHECK(connected_encoded_track_.IsNull());
connected_encoded_track_ = track;
MediaStreamVideoTrack* const video_track = MediaStreamVideoTrack::From(track);
DCHECK(video_track);
video_track->AddEncodedSink(this, callback);
}
void MediaStreamVideoSink::DisconnectFromTrack() {
RemoveSinkFromMediaStreamTrack(connected_track_, this);
connected_track_.Reset();
}
void MediaStreamVideoSink::DisconnectEncodedFromTrack() {
MediaStreamVideoTrack* const video_track =
MediaStreamVideoTrack::From(connected_encoded_track_);
if (video_track) {
video_track->RemoveEncodedSink(this);
}
connected_encoded_track_.Reset();
}
void MediaStreamVideoSink::OnFrameDropped(
media::VideoCaptureFrameDropReason reason) {
if (connected_track_.IsNull())
return;
// For UMA reasons we want to log this frame as dropped, even though it was
// delivered to the sink before being dropped. This is not considered a frame
// drop by the MediaStreamTrack Statistics API.
if (auto* const video_track = MediaStreamVideoTrack::From(connected_track_)) {
video_track->OnSinkDroppedFrame(reason);
}
}
double MediaStreamVideoSink::GetRequiredMinFramesPerSec() const {
return 0;
}
} // namespace blink
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