1 files changed, 66 insertions, 0 deletions
diff --git a/third_party/libwebrtc/video/render/incoming_video_stream.cc b/third_party/libwebrtc/video/render/incoming_video_stream.cc
new file mode 100644
index 0000000000..e740c47bd0
--- /dev/null
+++ b/third_party/libwebrtc/video/render/incoming_video_stream.cc
@@ -0,0 +1,66 @@
+/*
+ *  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());
+}
+
+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_);
+    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_);
+  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