check v4l frame rate capability with bitwise method.

webrtc/modules/video_capture/linux/video_capture_linux.cc

 /*
  *  Copyright (c) 2012 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.
  */
 
@@ skipping 227 matching lines @@
     struct v4l2_streamparm streamparms;
     memset(&streamparms, 0, sizeof(streamparms));
     streamparms.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
     if (ioctl(_deviceFd, VIDIOC_G_PARM, &streamparms) < 0) {
         WEBRTC_TRACE(webrtc::kTraceError, webrtc::kTraceVideoCapture, _id,
                    "error in VIDIOC_G_PARM errno = %d", errno);
         driver_framerate_support = false;
       // continue
     } else {
       // check the capability flag is set to V4L2_CAP_TIMEPERFRAME.
-      if (streamparms.parm.capture.capability == V4L2_CAP_TIMEPERFRAME) {
+      if (streamparms.parm.capture.capability & V4L2_CAP_TIMEPERFRAME) {
         // driver supports the feature. Set required framerate.
         memset(&streamparms, 0, sizeof(streamparms));
         streamparms.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
         streamparms.parm.capture.timeperframe.numerator = 1;
         streamparms.parm.capture.timeperframe.denominator = capability.maxFPS;
         if (ioctl(_deviceFd, VIDIOC_S_PARM, &streamparms) < 0) {
           WEBRTC_TRACE(webrtc::kTraceError, webrtc::kTraceVideoCapture, _id,
                    "Failed to set the framerate. errno=%d", errno);
           driver_framerate_support = false;
         } else {
@@ skipping 224 matching lines @@
 {
     settings.width = _currentWidth;
     settings.height = _currentHeight;
     settings.maxFPS = _currentFrameRate;
     settings.rawType=_captureVideoType;
 
     return 0;
 }
 }  // namespace videocapturemodule
 }  // namespace webrtc