1 files changed, 90 insertions, 0 deletions
diff --git a/dom/media/systemservices/VideoFrameUtils.cpp b/dom/media/systemservices/VideoFrameUtils.cpp
new file mode 100644
index 0000000000..00ead56a7b
--- /dev/null
+++ b/dom/media/systemservices/VideoFrameUtils.cpp
@@ -0,0 +1,90 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set sw=2 ts=8 et ft=cpp : */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "VideoFrameUtils.h"
+#include "api/video/video_frame.h"
+#include "mozilla/ShmemPool.h"
+
+namespace mozilla {
+
+uint32_t VideoFrameUtils::TotalRequiredBufferSize(
+    const webrtc::VideoFrame& aVideoFrame) {
+  auto i420 = aVideoFrame.video_frame_buffer()->ToI420();
+  auto height = i420->height();
+  size_t size = height * i420->StrideY() +
+                ((height + 1) / 2) * i420->StrideU() +
+                ((height + 1) / 2) * i420->StrideV();
+  MOZ_RELEASE_ASSERT(size < std::numeric_limits<uint32_t>::max());
+  return static_cast<uint32_t>(size);
+}
+
+void VideoFrameUtils::InitFrameBufferProperties(
+    const webrtc::VideoFrame& aVideoFrame,
+    camera::VideoFrameProperties& aDestProps) {
+  // The VideoFrameBuffer image data stored in the accompanying buffer
+  // the buffer is at least this size of larger.
+  aDestProps.bufferSize() = TotalRequiredBufferSize(aVideoFrame);
+
+  aDestProps.timeStamp() = aVideoFrame.timestamp();
+  aDestProps.ntpTimeMs() = aVideoFrame.ntp_time_ms();
+  aDestProps.renderTimeMs() = aVideoFrame.render_time_ms();
+
+  aDestProps.rotation() = aVideoFrame.rotation();
+
+  auto i420 = aVideoFrame.video_frame_buffer()->ToI420();
+  auto height = i420->height();
+  aDestProps.yAllocatedSize() = height * i420->StrideY();
+  aDestProps.uAllocatedSize() = ((height + 1) / 2) * i420->StrideU();
+  aDestProps.vAllocatedSize() = ((height + 1) / 2) * i420->StrideV();
+
+  aDestProps.width() = i420->width();
+  aDestProps.height() = height;
+
+  aDestProps.yStride() = i420->StrideY();
+  aDestProps.uStride() = i420->StrideU();
+  aDestProps.vStride() = i420->StrideV();
+}
+
+void VideoFrameUtils::CopyVideoFrameBuffers(uint8_t* aDestBuffer,
+                                            const size_t aDestBufferSize,
+                                            const webrtc::VideoFrame& aFrame) {
+  size_t aggregateSize = TotalRequiredBufferSize(aFrame);
+
+  MOZ_ASSERT(aDestBufferSize >= aggregateSize);
+  auto i420 = aFrame.video_frame_buffer()->ToI420();
+
+  // If planes are ordered YUV and contiguous then do a single copy
+  if ((i420->DataY() != nullptr) &&
+      // Check that the three planes are ordered
+      (i420->DataY() < i420->DataU()) && (i420->DataU() < i420->DataV()) &&
+      //  Check that the last plane ends at firstPlane[totalsize]
+      (&i420->DataY()[aggregateSize] ==
+       &i420->DataV()[((i420->height() + 1) / 2) * i420->StrideV()])) {
+    memcpy(aDestBuffer, i420->DataY(), aggregateSize);
+    return;
+  }
+
+  // Copy each plane
+  size_t offset = 0;
+  size_t size;
+  auto height = i420->height();
+  size = height * i420->StrideY();
+  memcpy(&aDestBuffer[offset], i420->DataY(), size);
+  offset += size;
+  size = ((height + 1) / 2) * i420->StrideU();
+  memcpy(&aDestBuffer[offset], i420->DataU(), size);
+  offset += size;
+  size = ((height + 1) / 2) * i420->StrideV();
+  memcpy(&aDestBuffer[offset], i420->DataV(), size);
+}
+
+void VideoFrameUtils::CopyVideoFrameBuffers(
+    ShmemBuffer& aDestShmem, const webrtc::VideoFrame& aVideoFrame) {
+  CopyVideoFrameBuffers(aDestShmem.Get().get<uint8_t>(),
+                        aDestShmem.Get().Size<uint8_t>(), aVideoFrame);
+}
+
+}  // namespace mozilla