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* 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 "api/video/video_rotation.h"
#include "rtc_base/checks.h"
namespace webrtc {
// Please refer to
// 12.07.00_60/ts_126114v120700p.pdf Section 7.4.5. The rotation of a frame is
// the clockwise angle the frames must be rotated in order to display the frames
// correctly if the display is rotated in its natural orientation.
inline uint8_t ConvertVideoRotationToCVOByte(VideoRotation rotation) {
switch (rotation) {
case kVideoRotation_0:
return 0;
case kVideoRotation_90:
return 1;
case kVideoRotation_180:
return 2;
case kVideoRotation_270:
return 3;
return 0;
inline VideoRotation ConvertCVOByteToVideoRotation(uint8_t cvo_byte) {
// CVO byte: |0 0 0 0 C F R R|.
const uint8_t rotation_bits = cvo_byte & 0x3;
switch (rotation_bits) {
case 0:
return kVideoRotation_0;
case 1:
return kVideoRotation_90;
case 2:
return kVideoRotation_180;
case 3:
return kVideoRotation_270;
return kVideoRotation_0;
} // namespace webrtc