| /* |
| * 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. |
| */ |
| #ifndef WEBRTC_MODULES_RTP_RTCP_INCLUDE_RTP_CVO_H_ |
| #define WEBRTC_MODULES_RTP_RTCP_INCLUDE_RTP_CVO_H_ |
| |
| #include "webrtc/base/checks.h" |
| #include "webrtc/common_video/rotation.h" |
| |
| namespace webrtc { |
| |
| // Please refer to http://www.etsi.org/deliver/etsi_ts/126100_126199/126114/ |
| // 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; |
| } |
| RTC_NOTREACHED(); |
| 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; |
| default: |
| RTC_NOTREACHED(); |
| return kVideoRotation_0; |
| } |
| } |
| |
| } // namespace webrtc |
| #endif // WEBRTC_MODULES_RTP_RTCP_INCLUDE_RTP_CVO_H_ |