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| 1 /* | |
| 2 * Copyright (c) 2009 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 | |
| 11 /* | |
| 12 * Author: lexnikitin@google.com (Alexey Nikitin) | |
| 13 * | |
| 14 * V4LLookup provides basic functionality to work with V2L2 devices in Linux | |
| 15 * The functionality is implemented as a class with virtual methods for | |
| 16 * the purpose of unit testing. | |
| 17 */ | |
| 18 #include "webrtc/media/devices/v4llookup.h" | |
| 19 | |
| 20 #include <errno.h> | |
| 21 #include <fcntl.h> | |
| 22 #include <linux/types.h> | |
| 23 #include <linux/videodev2.h> | |
| 24 #include <string.h> | |
| 25 #include <sys/ioctl.h> | |
| 26 #include <sys/stat.h> | |
| 27 #include <sys/types.h> | |
| 28 #include <unistd.h> | |
| 29 | |
| 30 #include "webrtc/base/logging.h" | |
| 31 | |
| 32 namespace cricket { | |
| 33 | |
| 34 V4LLookup *V4LLookup::v4l_lookup_ = NULL; | |
| 35 | |
| 36 bool V4LLookup::CheckIsV4L2Device(const std::string& device_path) { | |
| 37 // check device major/minor numbers are in the range for video devices. | |
| 38 struct stat s; | |
| 39 | |
| 40 if (lstat(device_path.c_str(), &s) != 0 || !S_ISCHR(s.st_mode)) return false; | |
| 41 | |
| 42 int video_fd = -1; | |
| 43 bool is_v4l2 = false; | |
| 44 | |
| 45 // check major/minur device numbers are in range for video device | |
| 46 if (major(s.st_rdev) == 81) { | |
| 47 dev_t num = minor(s.st_rdev); | |
| 48 if (num <= 63) { | |
| 49 video_fd = ::open(device_path.c_str(), O_RDONLY | O_NONBLOCK); | |
| 50 if ((video_fd >= 0) || (errno == EBUSY)) { | |
| 51 ::v4l2_capability video_caps; | |
| 52 memset(&video_caps, 0, sizeof(video_caps)); | |
| 53 | |
| 54 if ((errno == EBUSY) || | |
| 55 (::ioctl(video_fd, VIDIOC_QUERYCAP, &video_caps) >= 0 && | |
| 56 (video_caps.capabilities & V4L2_CAP_VIDEO_CAPTURE))) { | |
| 57 LOG(LS_INFO) << "Found V4L2 capture device " << device_path; | |
| 58 | |
| 59 is_v4l2 = true; | |
| 60 } else { | |
| 61 LOG_ERRNO(LS_ERROR) << "VIDIOC_QUERYCAP failed for " << device_path; | |
| 62 } | |
| 63 } else { | |
| 64 LOG_ERRNO(LS_ERROR) << "Failed to open " << device_path; | |
| 65 } | |
| 66 } | |
| 67 } | |
| 68 | |
| 69 if (video_fd >= 0) | |
| 70 ::close(video_fd); | |
| 71 | |
| 72 return is_v4l2; | |
| 73 } | |
| 74 | |
| 75 }; // namespace cricket | |
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Chromium Code Reviews
Issue 1751583002:
Remove unused libudev on Linux. (Closed)
Base URL: https://chromium.googlesource.com/external/webrtc.git@master