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/*
* Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#include "video/render/incoming_video_stream.h"
#include <memory>
#include <utility>
#include "absl/types/optional.h"
#include "api/units/time_delta.h"
#include "rtc_base/checks.h"
#include "rtc_base/trace_event.h"
#include "video/render/video_render_frames.h"
namespace webrtc {
IncomingVideoStream::IncomingVideoStream(
TaskQueueFactory* task_queue_factory,
int32_t delay_ms,
rtc::VideoSinkInterface<VideoFrame>* callback)
: render_buffers_(delay_ms),
callback_(callback),
incoming_render_queue_(task_queue_factory->CreateTaskQueue(
"IncomingVideoStream",
TaskQueueFactory::Priority::HIGH)) {}
IncomingVideoStream::~IncomingVideoStream() {
RTC_DCHECK(main_thread_checker_.IsCurrent());
// The queue must be destroyed before its pointer is invalidated to avoid race
// between destructor and posting task to the task queue from itself.
// std::unique_ptr destructor does the same two operations in reverse order as
// it doesn't expect member would be used after its destruction has started.
incoming_render_queue_.get_deleter()(incoming_render_queue_.get());
incoming_render_queue_.release();
}
void IncomingVideoStream::OnFrame(const VideoFrame& video_frame) {
TRACE_EVENT0("webrtc", "IncomingVideoStream::OnFrame");
RTC_CHECK_RUNS_SERIALIZED(&decoder_race_checker_);
RTC_DCHECK(!incoming_render_queue_->IsCurrent());
// TODO(srte): Using video_frame = std::move(video_frame) would move the frame
// into the lambda instead of copying it, but it doesn't work unless we change
// OnFrame to take its frame argument by value instead of const reference.
incoming_render_queue_->PostTask([this, video_frame = video_frame]() mutable {
RTC_DCHECK_RUN_ON(incoming_render_queue_.get());
if (render_buffers_.AddFrame(std::move(video_frame)) == 1)
Dequeue();
});
}
void IncomingVideoStream::Dequeue() {
TRACE_EVENT0("webrtc", "IncomingVideoStream::Dequeue");
RTC_DCHECK_RUN_ON(incoming_render_queue_.get());
absl::optional<VideoFrame> frame_to_render = render_buffers_.FrameToRender();
if (frame_to_render)
callback_->OnFrame(*frame_to_render);
if (render_buffers_.HasPendingFrames()) {
uint32_t wait_time = render_buffers_.TimeToNextFrameRelease();
incoming_render_queue_->PostDelayedHighPrecisionTask(
[this]() { Dequeue(); }, TimeDelta::Millis(wait_time));
}
}
} // namespace webrtc
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