1 files changed, 96 insertions, 0 deletions
diff --git a/third_party/libwebrtc/modules/video_coding/frame_helpers.cc b/third_party/libwebrtc/modules/video_coding/frame_helpers.cc
new file mode 100644
index 0000000000..e25eac8a18
--- /dev/null
+++ b/third_party/libwebrtc/modules/video_coding/frame_helpers.cc
@@ -0,0 +1,96 @@
+/*
+ *  Copyright (c) 2021 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 "modules/video_coding/frame_helpers.h"
+
+#include <utility>
+
+#include "rtc_base/logging.h"
+
+namespace webrtc {
+
+namespace {
+constexpr TimeDelta kMaxVideoDelay = TimeDelta::Millis(10000);
+}
+
+bool FrameHasBadRenderTiming(Timestamp render_time, Timestamp now) {
+  // Zero render time means render immediately.
+  if (render_time.IsZero()) {
+    return false;
+  }
+  if (render_time < Timestamp::Zero()) {
+    return true;
+  }
+  TimeDelta frame_delay = render_time - now;
+  if (frame_delay.Abs() > kMaxVideoDelay) {
+    RTC_LOG(LS_WARNING) << "Frame has bad render timing because it is out of "
+                           "the delay bounds (frame_delay_ms="
+                        << frame_delay.ms()
+                        << ", kMaxVideoDelay_ms=" << kMaxVideoDelay.ms() << ")";
+    return true;
+  }
+  return false;
+}
+
+bool TargetVideoDelayIsTooLarge(TimeDelta target_video_delay) {
+  if (target_video_delay > kMaxVideoDelay) {
+    RTC_LOG(LS_WARNING)
+        << "Target video delay is too large. (target_video_delay_ms="
+        << target_video_delay.ms()
+        << ", kMaxVideoDelay_ms=" << kMaxVideoDelay.ms() << ")";
+    return true;
+  }
+  return false;
+}
+
+std::unique_ptr<EncodedFrame> CombineAndDeleteFrames(
+    absl::InlinedVector<std::unique_ptr<EncodedFrame>, 4> frames) {
+  RTC_DCHECK(!frames.empty());
+
+  if (frames.size() == 1) {
+    return std::move(frames[0]);
+  }
+
+  size_t total_length = 0;
+  for (const auto& frame : frames) {
+    total_length += frame->size();
+  }
+  const EncodedFrame& last_frame = *frames.back();
+  std::unique_ptr<EncodedFrame> first_frame = std::move(frames[0]);
+  auto encoded_image_buffer = EncodedImageBuffer::Create(total_length);
+  uint8_t* buffer = encoded_image_buffer->data();
+  first_frame->SetSpatialLayerFrameSize(first_frame->SpatialIndex().value_or(0),
+                                        first_frame->size());
+  memcpy(buffer, first_frame->data(), first_frame->size());
+  buffer += first_frame->size();
+
+  // Spatial index of combined frame is set equal to spatial index of its top
+  // spatial layer.
+  first_frame->SetSpatialIndex(last_frame.SpatialIndex().value_or(0));
+
+  first_frame->video_timing_mutable()->network2_timestamp_ms =
+      last_frame.video_timing().network2_timestamp_ms;
+  first_frame->video_timing_mutable()->receive_finish_ms =
+      last_frame.video_timing().receive_finish_ms;
+
+  // Append all remaining frames to the first one.
+  for (size_t i = 1; i < frames.size(); ++i) {
+    // Let |next_frame| fall out of scope so it is deleted after copying.
+    std::unique_ptr<EncodedFrame> next_frame = std::move(frames[i]);
+    first_frame->SetSpatialLayerFrameSize(
+        next_frame->SpatialIndex().value_or(0), next_frame->size());
+    memcpy(buffer, next_frame->data(), next_frame->size());
+    buffer += next_frame->size();
+  }
+  first_frame->SetEncodedData(encoded_image_buffer);
+  return first_frame;
+}
+
+}  // namespace webrtc