1 files changed, 87 insertions, 0 deletions
diff --git a/third_party/libwebrtc/media/base/fake_video_renderer.cc b/third_party/libwebrtc/media/base/fake_video_renderer.cc
new file mode 100644
index 0000000000..b235738d24
--- /dev/null
+++ b/third_party/libwebrtc/media/base/fake_video_renderer.cc
@@ -0,0 +1,87 @@
+/*
+ *  Copyright (c) 2018 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 "media/base/fake_video_renderer.h"
+
+namespace cricket {
+namespace {
+bool CheckFrameColorYuv(const webrtc::VideoFrame& frame) {
+  // TODO(zhurunz) Check with VP8 team to see if we can remove this
+  // tolerance on Y values. Some unit tests produce Y values close
+  // to 16 rather than close to zero, for supposedly black frames.
+  // Largest value observed is 34, e.g., running
+  // PeerConnectionIntegrationTest.SendAndReceive16To9AspectRatio.
+  static constexpr uint8_t y_min = 0;
+  static constexpr uint8_t y_max = 48;
+  static constexpr uint8_t u_min = 128;
+  static constexpr uint8_t u_max = 128;
+  static constexpr uint8_t v_min = 128;
+  static constexpr uint8_t v_max = 128;
+
+  if (!frame.video_frame_buffer()) {
+    return false;
+  }
+  rtc::scoped_refptr<const webrtc::I420BufferInterface> i420_buffer =
+      frame.video_frame_buffer()->ToI420();
+  // Y
+  int y_width = frame.width();
+  int y_height = frame.height();
+  const uint8_t* y_plane = i420_buffer->DataY();
+  const uint8_t* y_pos = y_plane;
+  int32_t y_pitch = i420_buffer->StrideY();
+  for (int i = 0; i < y_height; ++i) {
+    for (int j = 0; j < y_width; ++j) {
+      uint8_t y_value = *(y_pos + j);
+      if (y_value < y_min || y_value > y_max) {
+        return false;
+      }
+    }
+    y_pos += y_pitch;
+  }
+  // U and V
+  int chroma_width = i420_buffer->ChromaWidth();
+  int chroma_height = i420_buffer->ChromaHeight();
+  const uint8_t* u_plane = i420_buffer->DataU();
+  const uint8_t* v_plane = i420_buffer->DataV();
+  const uint8_t* u_pos = u_plane;
+  const uint8_t* v_pos = v_plane;
+  int32_t u_pitch = i420_buffer->StrideU();
+  int32_t v_pitch = i420_buffer->StrideV();
+  for (int i = 0; i < chroma_height; ++i) {
+    for (int j = 0; j < chroma_width; ++j) {
+      uint8_t u_value = *(u_pos + j);
+      if (u_value < u_min || u_value > u_max) {
+        return false;
+      }
+      uint8_t v_value = *(v_pos + j);
+      if (v_value < v_min || v_value > v_max) {
+        return false;
+      }
+    }
+    u_pos += u_pitch;
+    v_pos += v_pitch;
+  }
+  return true;
+}
+}  // namespace
+
+FakeVideoRenderer::FakeVideoRenderer() = default;
+
+void FakeVideoRenderer::OnFrame(const webrtc::VideoFrame& frame) {
+  webrtc::MutexLock lock(&mutex_);
+  black_frame_ = CheckFrameColorYuv(frame);
+  ++num_rendered_frames_;
+  width_ = frame.width();
+  height_ = frame.height();
+  rotation_ = frame.rotation();
+  timestamp_us_ = frame.timestamp_us();
+}
+
+}  // namespace cricket