Line data    Source code

       1             : /*
       2             :  *  Copyright (c) 2015 The WebRTC project authors. All Rights Reserved.
       3             :  *
       4             :  *  Use of this source code is governed by a BSD-style license
       5             :  *  that can be found in the LICENSE file in the root of the source
       6             :  *  tree. An additional intellectual property rights grant can be found
       7             :  *  in the file PATENTS.  All contributing project authors may
       8             :  *  be found in the AUTHORS file in the root of the source tree.
       9             :  */
      10             : #ifndef WEBRTC_MODULES_RTP_RTCP_INCLUDE_RTP_CVO_H_
      11             : #define WEBRTC_MODULES_RTP_RTCP_INCLUDE_RTP_CVO_H_
      12             : 
      13             : #include "webrtc/api/video/video_rotation.h"
      14             : #include "webrtc/base/checks.h"
      15             : 
      16             : namespace webrtc {
      17             : 
      18             : // Please refer to http://www.etsi.org/deliver/etsi_ts/126100_126199/126114/
      19             : // 12.07.00_60/ts_126114v120700p.pdf Section 7.4.5. The rotation of a frame is
      20             : // the clockwise angle the frames must be rotated in order to display the frames
      21             : // correctly if the display is rotated in its natural orientation.
      22           0 : inline uint8_t ConvertVideoRotationToCVOByte(VideoRotation rotation) {
      23           0 :   switch (rotation) {
      24             :     case kVideoRotation_0:
      25           0 :       return 0;
      26             :     case kVideoRotation_90:
      27           0 :       return 1;
      28             :     case kVideoRotation_180:
      29           0 :       return 2;
      30             :     case kVideoRotation_270:
      31           0 :       return 3;
      32             :   }
      33           0 :   RTC_NOTREACHED();
      34           0 :   return 0;
      35             : }
      36             : 
      37           0 : inline VideoRotation ConvertCVOByteToVideoRotation(uint8_t cvo_byte) {
      38             :   // CVO byte: |0 0 0 0 C F R R|.
      39           0 :   const uint8_t rotation_bits = cvo_byte & 0x3;
      40           0 :   switch (rotation_bits) {
      41             :     case 0:
      42           0 :       return kVideoRotation_0;
      43             :     case 1:
      44           0 :       return kVideoRotation_90;
      45             :     case 2:
      46           0 :       return kVideoRotation_180;
      47             :     case 3:
      48           0 :       return kVideoRotation_270;
      49             :     default:
      50           0 :       RTC_NOTREACHED();
      51           0 :       return kVideoRotation_0;
      52             :   }
      53             : }
      54             : 
      55             : }  // namespace webrtc
      56             : #endif  // WEBRTC_MODULES_RTP_RTCP_INCLUDE_RTP_CVO_H_