1 files changed, 116 insertions, 0 deletions
diff --git a/third_party/libwebrtc/video/render/video_render_frames.cc b/third_party/libwebrtc/video/render/video_render_frames.cc
new file mode 100644
index 0000000000..ea1362abbb
--- /dev/null
+++ b/third_party/libwebrtc/video/render/video_render_frames.cc
@@ -0,0 +1,116 @@
+/*
+ *  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/video_render_frames.h"
+
+#include <type_traits>
+#include <utility>
+
+#include "rtc_base/checks.h"
+#include "rtc_base/logging.h"
+#include "rtc_base/time_utils.h"
+#include "system_wrappers/include/metrics.h"
+
+namespace webrtc {
+namespace {
+// Don't render frames with timestamp older than 500ms from now.
+const int kOldRenderTimestampMS = 500;
+// Don't render frames with timestamp more than 10s into the future.
+const int kFutureRenderTimestampMS = 10000;
+
+const uint32_t kEventMaxWaitTimeMs = 200;
+const uint32_t kMinRenderDelayMs = 10;
+const uint32_t kMaxRenderDelayMs = 500;
+const size_t kMaxIncomingFramesBeforeLogged = 100;
+
+uint32_t EnsureValidRenderDelay(uint32_t render_delay) {
+  return (render_delay < kMinRenderDelayMs || render_delay > kMaxRenderDelayMs)
+             ? kMinRenderDelayMs
+             : render_delay;
+}
+}  // namespace
+
+VideoRenderFrames::VideoRenderFrames(uint32_t render_delay_ms)
+    : render_delay_ms_(EnsureValidRenderDelay(render_delay_ms)) {}
+
+VideoRenderFrames::~VideoRenderFrames() {
+  frames_dropped_ += incoming_frames_.size();
+  RTC_HISTOGRAM_COUNTS_1000("WebRTC.Video.DroppedFrames.RenderQueue",
+                            frames_dropped_);
+  RTC_LOG(LS_INFO) << "WebRTC.Video.DroppedFrames.RenderQueue "
+                   << frames_dropped_;
+}
+
+int32_t VideoRenderFrames::AddFrame(VideoFrame&& new_frame) {
+  const int64_t time_now = rtc::TimeMillis();
+
+  // Drop old frames only when there are other frames in the queue, otherwise, a
+  // really slow system never renders any frames.
+  if (!incoming_frames_.empty() &&
+      new_frame.render_time_ms() + kOldRenderTimestampMS < time_now) {
+    RTC_LOG(LS_WARNING) << "Too old frame, timestamp=" << new_frame.timestamp();
+    ++frames_dropped_;
+    return -1;
+  }
+
+  if (new_frame.render_time_ms() > time_now + kFutureRenderTimestampMS) {
+    RTC_LOG(LS_WARNING) << "Frame too long into the future, timestamp="
+                        << new_frame.timestamp();
+    ++frames_dropped_;
+    return -1;
+  }
+
+  if (new_frame.render_time_ms() < last_render_time_ms_) {
+    RTC_LOG(LS_WARNING) << "Frame scheduled out of order, render_time="
+                        << new_frame.render_time_ms()
+                        << ", latest=" << last_render_time_ms_;
+    // For more details, see bug:
+    // https://bugs.chromium.org/p/webrtc/issues/detail?id=7253
+    ++frames_dropped_;
+    return -1;
+  }
+
+  last_render_time_ms_ = new_frame.render_time_ms();
+  incoming_frames_.emplace_back(std::move(new_frame));
+
+  if (incoming_frames_.size() > kMaxIncomingFramesBeforeLogged) {
+    RTC_LOG(LS_WARNING) << "Stored incoming frames: "
+                        << incoming_frames_.size();
+  }
+  return static_cast<int32_t>(incoming_frames_.size());
+}
+
+absl::optional<VideoFrame> VideoRenderFrames::FrameToRender() {
+  absl::optional<VideoFrame> render_frame;
+  // Get the newest frame that can be released for rendering.
+  while (!incoming_frames_.empty() && TimeToNextFrameRelease() <= 0) {
+    if (render_frame) {
+      ++frames_dropped_;
+    }
+    render_frame = std::move(incoming_frames_.front());
+    incoming_frames_.pop_front();
+  }
+  return render_frame;
+}
+
+uint32_t VideoRenderFrames::TimeToNextFrameRelease() {
+  if (incoming_frames_.empty()) {
+    return kEventMaxWaitTimeMs;
+  }
+  const int64_t time_to_release = incoming_frames_.front().render_time_ms() -
+                                  render_delay_ms_ - rtc::TimeMillis();
+  return time_to_release < 0 ? 0u : static_cast<uint32_t>(time_to_release);
+}
+
+bool VideoRenderFrames::HasPendingFrames() const {
+  return !incoming_frames_.empty();
+}
+
+}  // namespace webrtc