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| 1 /* | |
| 2 * libjingle | |
| 3 * Copyright 2009 Google Inc. | |
| 4 * | |
| 5 * Redistribution and use in source and binary forms, with or without | |
| 6 * modification, are permitted provided that the following conditions are met: | |
| 7 * | |
| 8 * 1. Redistributions of source code must retain the above copyright notice, | |
| 9 * this list of conditions and the following disclaimer. | |
| 10 * 2. Redistributions in binary form must reproduce the above copyright notice, | |
| 11 * this list of conditions and the following disclaimer in the documentation | |
| 12 * and/or other materials provided with the distribution. | |
| 13 * 3. The name of the author may not be used to endorse or promote products | |
| 14 * derived from this software without specific prior written permission. | |
| 15 * | |
| 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED | |
| 17 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF | |
| 18 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO | |
| 19 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
| 20 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, | |
| 21 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; | |
| 22 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, | |
| 23 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR | |
| 24 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF | |
| 25 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
| 26 */ | |
| 27 | |
| 28 /* | |
| 29 * Author: lexnikitin@google.com (Alexey Nikitin) | |
| 30 * | |
| 31 * V4LLookup provides basic functionality to work with V2L2 devices in Linux | |
| 32 * The functionality is implemented as a class with virtual methods for | |
| 33 * the purpose of unit testing. | |
| 34 */ | |
| 35 #include "talk/media/devices/v4llookup.h" | |
| 36 | |
| 37 #include <errno.h> | |
| 38 #include <fcntl.h> | |
| 39 #include <linux/types.h> | |
| 40 #include <linux/videodev2.h> | |
| 41 #include <string.h> | |
| 42 #include <sys/ioctl.h> | |
| 43 #include <sys/stat.h> | |
| 44 #include <sys/types.h> | |
| 45 #include <unistd.h> | |
| 46 | |
| 47 #include "webrtc/base/logging.h" | |
| 48 | |
| 49 namespace cricket { | |
| 50 | |
| 51 V4LLookup *V4LLookup::v4l_lookup_ = NULL; | |
| 52 | |
| 53 bool V4LLookup::CheckIsV4L2Device(const std::string& device_path) { | |
| 54 // check device major/minor numbers are in the range for video devices. | |
| 55 struct stat s; | |
| 56 | |
| 57 if (lstat(device_path.c_str(), &s) != 0 || !S_ISCHR(s.st_mode)) return false; | |
| 58 | |
| 59 int video_fd = -1; | |
| 60 bool is_v4l2 = false; | |
| 61 | |
| 62 // check major/minur device numbers are in range for video device | |
| 63 if (major(s.st_rdev) == 81) { | |
| 64 dev_t num = minor(s.st_rdev); | |
| 65 if (num <= 63) { | |
| 66 video_fd = ::open(device_path.c_str(), O_RDONLY | O_NONBLOCK); | |
| 67 if ((video_fd >= 0) || (errno == EBUSY)) { | |
| 68 ::v4l2_capability video_caps; | |
| 69 memset(&video_caps, 0, sizeof(video_caps)); | |
| 70 | |
| 71 if ((errno == EBUSY) || | |
| 72 (::ioctl(video_fd, VIDIOC_QUERYCAP, &video_caps) >= 0 && | |
| 73 (video_caps.capabilities & V4L2_CAP_VIDEO_CAPTURE))) { | |
| 74 LOG(LS_INFO) << "Found V4L2 capture device " << device_path; | |
| 75 | |
| 76 is_v4l2 = true; | |
| 77 } else { | |
| 78 LOG_ERRNO(LS_ERROR) << "VIDIOC_QUERYCAP failed for " << device_path; | |
| 79 } | |
| 80 } else { | |
| 81 LOG_ERRNO(LS_ERROR) << "Failed to open " << device_path; | |
| 82 } | |
| 83 } | |
| 84 } | |
| 85 | |
| 86 if (video_fd >= 0) | |
| 87 ::close(video_fd); | |
| 88 | |
| 89 return is_v4l2; | |
| 90 } | |
| 91 | |
| 92 }; // namespace cricket | |
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Chromium Code Reviews
Issue 1587193006:
Move talk/media to webrtc/media (Closed)
Base URL: https://chromium.googlesource.com/external/webrtc.git@master