New method I420Buffer::Copy.

webrtc/common_video/video_frame_buffer.cc

 /*
  *  Copyright (c) 2015 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 "webrtc/common_video/include/video_frame_buffer.h"
 
 #include "webrtc/base/checks.h"
 #include "webrtc/base/keep_ref_until_done.h"
+#include "libyuv/convert.h"
 
 // Aligning pointer to 64 bytes for improved performance, e.g. use SIMD.
 static const int kBufferAlignment = 64;
 
 namespace webrtc {
 
 namespace {
 
 int I420DataSize(int height, int stride_y, int stride_u, int stride_v) {
   return stride_y * height + (stride_u + stride_v) * ((height + 1) / 2);
@@ skipping 85 matching lines @@
 
 void* I420Buffer::native_handle() const {
   return nullptr;
 }
 
 rtc::scoped_refptr<VideoFrameBuffer> I420Buffer::NativeToI420Buffer() {
   RTC_NOTREACHED();
   return nullptr;
 }
 
+rtc::scoped_refptr<I420Buffer> I420Buffer::Copy(
+    const rtc::scoped_refptr<VideoFrameBuffer>& buffer) {
+  int width = buffer->width();
+  int height = buffer->height();
+  rtc::scoped_refptr<I420Buffer> copy =
+      new rtc::RefCountedObject<I420Buffer>(width, height);
+  RTC_CHECK(libyuv::I420Copy(buffer->data(kYPlane), buffer->stride(kYPlane),
+                             buffer->data(kUPlane), buffer->stride(kUPlane),
+                             buffer->data(kVPlane), buffer->stride(kVPlane),
+                             copy->MutableData(kYPlane), copy->stride(kYPlane),
+                             copy->MutableData(kUPlane), copy->stride(kUPlane),
+                             copy->MutableData(kVPlane), copy->stride(kVPlane),
+                             width, height) == 0);
+
+  return copy;
+}
+
 NativeHandleBuffer::NativeHandleBuffer(void* native_handle,
                                        int width,
                                        int height)
     : native_handle_(native_handle), width_(width), height_(height) {
   RTC_DCHECK(native_handle != nullptr);
   RTC_DCHECK_GT(width, 0);
   RTC_DCHECK_GT(height, 0);
 }
 
 int NativeHandleBuffer::width() const {
@@ skipping 112 matching lines @@
                            buffer->stride(kVPlane) * uv_offset_y + uv_offset_x;
   return new rtc::RefCountedObject<WrappedI420Buffer>(
       cropped_width, cropped_height,
       y_plane, buffer->stride(kYPlane),
       u_plane, buffer->stride(kUPlane),
       v_plane, buffer->stride(kVPlane),
       rtc::KeepRefUntilDone(buffer));
 }
 
 }  // namespace webrtc