| /* |
| * Copyright 2016 The Chromium OS Authors. All rights reserved. |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #include "hal/usb/v4l2_camera_device.h" |
| |
| #include <fcntl.h> |
| #include <linux/videodev2.h> |
| #include <poll.h> |
| #include <sys/ioctl.h> |
| |
| #include <algorithm> |
| #include <limits> |
| |
| #include <base/files/file_enumerator.h> |
| #include <base/files/file_util.h> |
| #include <base/files/scoped_file.h> |
| #include <base/posix/safe_strerror.h> |
| #include <base/strings/pattern.h> |
| #include <base/strings/stringprintf.h> |
| #include <base/timer/elapsed_timer.h> |
| #include <camera/camera_metadata.h> |
| |
| #include "cros-camera/common.h" |
| #include "hal/usb/camera_characteristics.h" |
| #include "hal/usb/quirks.h" |
| |
| namespace { |
| // Since cameras might report non-integer fps but in Android Camera 3 API we |
| // can only set fps range with integer in metadata. |
| constexpr float kFpsDifferenceThreshold = 1.0f; |
| } // namespace |
| |
| namespace cros { |
| |
| V4L2CameraDevice::V4L2CameraDevice() |
| : stream_on_(false), device_info_(DeviceInfo()) {} |
| |
| V4L2CameraDevice::V4L2CameraDevice(const DeviceInfo& device_info) |
| : stream_on_(false), device_info_(device_info) {} |
| |
| V4L2CameraDevice::~V4L2CameraDevice() { |
| device_fd_.reset(); |
| } |
| |
| int V4L2CameraDevice::Connect(const std::string& device_path) { |
| VLOGF(1) << "Connecting device path: " << device_path; |
| base::AutoLock l(lock_); |
| if (device_fd_.is_valid()) { |
| LOGF(ERROR) << "A camera device is opened (" << device_fd_.get() |
| << "). Please close it first"; |
| return -EIO; |
| } |
| |
| // Since device node may be changed after suspend/resume, we allow to use |
| // symbolic link to access device. |
| device_fd_.reset(RetryDeviceOpen(device_path, O_RDWR)); |
| if (!device_fd_.is_valid()) { |
| PLOGF(ERROR) << "Failed to open " << device_path; |
| return -errno; |
| } |
| |
| if (!IsCameraDevice(device_path)) { |
| LOGF(ERROR) << device_path << " is not a V4L2 video capture device"; |
| device_fd_.reset(); |
| return -EINVAL; |
| } |
| |
| // Get and set format here is used to prevent multiple camera using. |
| // UVC driver will acquire lock in VIDIOC_S_FMT and VIDIOC_S_SMT will fail if |
| // the camera is being used by a user. The second user will fail in Connect() |
| // instead of StreamOn(). Usually apps show better error message if camera |
| // open fails. If start preview fails, some apps do not handle it well. |
| int ret; |
| v4l2_format fmt = {}; |
| fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; |
| ret = TEMP_FAILURE_RETRY(ioctl(device_fd_.get(), VIDIOC_G_FMT, &fmt)); |
| if (ret < 0) { |
| PLOGF(ERROR) << "Unable to G_FMT"; |
| return -errno; |
| } |
| ret = TEMP_FAILURE_RETRY(ioctl(device_fd_.get(), VIDIOC_S_FMT, &fmt)); |
| if (ret < 0) { |
| LOGF(WARNING) << "Unable to S_FMT: " << base::safe_strerror(errno) |
| << ", maybe camera is being used by another app."; |
| return -errno; |
| } |
| |
| // Only set power line frequency when the value is correct. |
| if (device_info_.power_line_frequency != PowerLineFrequency::FREQ_ERROR) { |
| ret = SetPowerLineFrequency(device_info_.power_line_frequency); |
| if (ret < 0) { |
| if (IsExternalCamera()) { |
| VLOGF(2) << "Ignore SetPowerLineFrequency error for external camera"; |
| } else { |
| return -EINVAL; |
| } |
| } |
| } |
| |
| // Initial autofocus state. |
| struct v4l2_control control; |
| control.id = V4L2_CID_FOCUS_AUTO; |
| ret = TEMP_FAILURE_RETRY(ioctl(device_fd_.get(), VIDIOC_G_CTRL, &control)); |
| if (ret < 0) { |
| LOGF(WARNING) << "Failed to get V4L2_CID_FOCUS_AUTO"; |
| autofocus_supported_ = false; |
| autofocus_on_ = false; |
| } else { |
| autofocus_supported_ = true; |
| autofocus_on_ = control.value; |
| } |
| return 0; |
| } |
| |
| void V4L2CameraDevice::Disconnect() { |
| base::AutoLock l(lock_); |
| stream_on_ = false; |
| device_fd_.reset(); |
| buffers_at_client_.clear(); |
| } |
| |
| int V4L2CameraDevice::StreamOn(uint32_t width, |
| uint32_t height, |
| uint32_t pixel_format, |
| float frame_rate, |
| bool constant_frame_rate, |
| std::vector<base::ScopedFD>* fds, |
| std::vector<uint32_t>* buffer_sizes) { |
| base::AutoLock l(lock_); |
| if (!device_fd_.is_valid()) { |
| LOGF(ERROR) << "Device is not opened"; |
| return -ENODEV; |
| } |
| if (stream_on_) { |
| LOGF(ERROR) << "Device has stream already started"; |
| return -EIO; |
| } |
| |
| int ret; |
| struct v4l2_control control; |
| control.id = V4L2_CID_EXPOSURE_AUTO_PRIORITY; |
| control.value = constant_frame_rate ? 0 : 1; |
| ret = TEMP_FAILURE_RETRY(ioctl(device_fd_.get(), VIDIOC_S_CTRL, &control)); |
| if (ret < 0) { |
| LOGF(WARNING) << "Failed to set V4L2_CID_EXPOSURE_AUTO_PRIORITY"; |
| } |
| |
| // Some drivers use rational time per frame instead of float frame rate, this |
| // constant k is used to convert between both: A fps -> [k/k*A] seconds/frame. |
| v4l2_format fmt = {}; |
| fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; |
| fmt.fmt.pix.width = width; |
| fmt.fmt.pix.height = height; |
| fmt.fmt.pix.pixelformat = pixel_format; |
| ret = TEMP_FAILURE_RETRY(ioctl(device_fd_.get(), VIDIOC_S_FMT, &fmt)); |
| if (ret < 0) { |
| PLOGF(ERROR) << "Unable to S_FMT"; |
| return -errno; |
| } |
| VLOGF(1) << "Actual width: " << fmt.fmt.pix.width |
| << ", height: " << fmt.fmt.pix.height |
| << ", pixelformat: " << std::hex << fmt.fmt.pix.pixelformat; |
| |
| if (width != fmt.fmt.pix.width || height != fmt.fmt.pix.height || |
| pixel_format != fmt.fmt.pix.pixelformat) { |
| LOGF(ERROR) << "Unsupported format: width " << width << ", height " |
| << height << ", pixelformat " << pixel_format; |
| return -EINVAL; |
| } |
| |
| if (frame_rate != frame_rate_) { |
| ret = SetFrameRate(frame_rate); |
| if (ret < 0) { |
| return ret; |
| } |
| } |
| |
| v4l2_requestbuffers req_buffers; |
| memset(&req_buffers, 0, sizeof(req_buffers)); |
| req_buffers.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; |
| req_buffers.memory = V4L2_MEMORY_MMAP; |
| req_buffers.count = kNumVideoBuffers; |
| if (TEMP_FAILURE_RETRY( |
| ioctl(device_fd_.get(), VIDIOC_REQBUFS, &req_buffers)) < 0) { |
| PLOGF(ERROR) << "REQBUFS fails"; |
| return -errno; |
| } |
| VLOGF(1) << "Requested buffer number: " << req_buffers.count; |
| |
| buffers_at_client_.resize(req_buffers.count); |
| std::vector<base::ScopedFD> temp_fds; |
| for (uint32_t i = 0; i < req_buffers.count; i++) { |
| v4l2_exportbuffer expbuf; |
| memset(&expbuf, 0, sizeof(expbuf)); |
| expbuf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; |
| expbuf.index = i; |
| if (TEMP_FAILURE_RETRY(ioctl(device_fd_.get(), VIDIOC_EXPBUF, &expbuf)) < |
| 0) { |
| PLOGF(ERROR) << "EXPBUF (" << i << ") fails"; |
| return -errno; |
| } |
| VLOGF(1) << "Exported frame buffer fd: " << expbuf.fd; |
| temp_fds.push_back(base::ScopedFD(expbuf.fd)); |
| buffers_at_client_[i] = false; |
| |
| v4l2_buffer buffer = {}; |
| buffer.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; |
| buffer.index = i; |
| buffer.memory = V4L2_MEMORY_MMAP; |
| |
| if (TEMP_FAILURE_RETRY(ioctl(device_fd_.get(), VIDIOC_QBUF, &buffer)) < 0) { |
| PLOGF(ERROR) << "QBUF (" << i << ") fails"; |
| return -errno; |
| } |
| |
| buffer_sizes->push_back(buffer.length); |
| } |
| |
| v4l2_buf_type capture_type = V4L2_BUF_TYPE_VIDEO_CAPTURE; |
| if (TEMP_FAILURE_RETRY( |
| ioctl(device_fd_.get(), VIDIOC_STREAMON, &capture_type)) < 0) { |
| PLOGF(ERROR) << "STREAMON fails"; |
| return -errno; |
| } |
| |
| for (size_t i = 0; i < temp_fds.size(); i++) { |
| fds->push_back(std::move(temp_fds[i])); |
| } |
| |
| stream_on_ = true; |
| return 0; |
| } |
| |
| int V4L2CameraDevice::StreamOff() { |
| base::AutoLock l(lock_); |
| if (!device_fd_.is_valid()) { |
| LOGF(ERROR) << "Device is not opened"; |
| return -ENODEV; |
| } |
| // Because UVC driver cannot allow STREAMOFF after REQBUF(0), adding a check |
| // here to prevent it. |
| if (!stream_on_) { |
| return 0; |
| } |
| |
| v4l2_buf_type capture_type = V4L2_BUF_TYPE_VIDEO_CAPTURE; |
| if (TEMP_FAILURE_RETRY( |
| ioctl(device_fd_.get(), VIDIOC_STREAMOFF, &capture_type)) < 0) { |
| PLOGF(ERROR) << "STREAMOFF fails"; |
| return -errno; |
| } |
| v4l2_requestbuffers req_buffers; |
| memset(&req_buffers, 0, sizeof(req_buffers)); |
| req_buffers.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; |
| req_buffers.memory = V4L2_MEMORY_MMAP; |
| req_buffers.count = 0; |
| if (TEMP_FAILURE_RETRY( |
| ioctl(device_fd_.get(), VIDIOC_REQBUFS, &req_buffers)) < 0) { |
| PLOGF(ERROR) << "REQBUFS fails"; |
| return -errno; |
| } |
| buffers_at_client_.clear(); |
| stream_on_ = false; |
| return 0; |
| } |
| |
| int V4L2CameraDevice::GetNextFrameBuffer(uint32_t* buffer_id, |
| uint32_t* data_size, |
| uint64_t* v4l2_ts, |
| uint64_t* user_ts) { |
| base::AutoLock l(lock_); |
| if (!device_fd_.is_valid()) { |
| LOGF(ERROR) << "Device is not opened"; |
| return -ENODEV; |
| } |
| if (!stream_on_) { |
| LOGF(ERROR) << "Streaming is not started"; |
| return -EIO; |
| } |
| |
| if (device_info_.quirks & kQuirkRestartOnTimeout) { |
| pollfd device_pfd = {}; |
| device_pfd.fd = device_fd_.get(); |
| device_pfd.events = POLLIN; |
| |
| constexpr int kCaptureTimeoutMs = 1000; |
| const int result = |
| TEMP_FAILURE_RETRY(poll(&device_pfd, 1, kCaptureTimeoutMs)); |
| |
| if (result < 0) { |
| PLOGF(ERROR) << "Polling fails"; |
| return -errno; |
| } else if (result == 0) { |
| LOGF(ERROR) << "Timed out waiting for captured frame"; |
| return -ETIMEDOUT; |
| } |
| |
| if (!(device_pfd.revents & POLLIN)) { |
| LOGF(ERROR) << "Unexpected event occurred while polling"; |
| return -EIO; |
| } |
| } |
| |
| v4l2_buffer buffer; |
| memset(&buffer, 0, sizeof(buffer)); |
| buffer.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; |
| buffer.memory = V4L2_MEMORY_MMAP; |
| if (TEMP_FAILURE_RETRY(ioctl(device_fd_.get(), VIDIOC_DQBUF, &buffer)) < 0) { |
| PLOGF(ERROR) << "DQBUF fails"; |
| return -errno; |
| } |
| VLOGF(1) << "DQBUF returns index " << buffer.index << " length " |
| << buffer.length; |
| |
| if (buffer.index >= buffers_at_client_.size() || |
| buffers_at_client_[buffer.index]) { |
| LOGF(ERROR) << "Invalid buffer id " << buffer.index; |
| return -EINVAL; |
| } |
| |
| *buffer_id = buffer.index; |
| *data_size = buffer.bytesused; |
| |
| struct timeval tv = buffer.timestamp; |
| *v4l2_ts = tv.tv_sec * 1'000'000'000LL + tv.tv_usec * 1000; |
| |
| struct timespec ts; |
| if (clock_gettime(GetUvcClock(), &ts) < 0) { |
| LOGF(ERROR) << "Get clock time fails"; |
| return -errno; |
| } |
| |
| *user_ts = ts.tv_sec * 1'000'000'000LL + ts.tv_nsec; |
| |
| buffers_at_client_[buffer.index] = true; |
| |
| return 0; |
| } |
| |
| int V4L2CameraDevice::ReuseFrameBuffer(uint32_t buffer_id) { |
| base::AutoLock l(lock_); |
| if (!device_fd_.is_valid()) { |
| LOGF(ERROR) << "Device is not opened"; |
| return -ENODEV; |
| } |
| if (!stream_on_) { |
| LOGF(ERROR) << "Streaming is not started"; |
| return -EIO; |
| } |
| |
| VLOGF(1) << "Reuse buffer id: " << buffer_id; |
| if (buffer_id >= buffers_at_client_.size() || |
| !buffers_at_client_[buffer_id]) { |
| LOGF(ERROR) << "Invalid buffer id: " << buffer_id; |
| return -EINVAL; |
| } |
| v4l2_buffer buffer; |
| memset(&buffer, 0, sizeof(buffer)); |
| buffer.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; |
| buffer.memory = V4L2_MEMORY_MMAP; |
| buffer.index = buffer_id; |
| if (TEMP_FAILURE_RETRY(ioctl(device_fd_.get(), VIDIOC_QBUF, &buffer)) < 0) { |
| PLOGF(ERROR) << "QBUF fails"; |
| return -errno; |
| } |
| buffers_at_client_[buffer.index] = false; |
| return 0; |
| } |
| |
| bool V4L2CameraDevice::IsBufferFilled(uint32_t buffer_id) { |
| v4l2_buffer buffer = {}; |
| buffer.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; |
| buffer.memory = V4L2_MEMORY_MMAP; |
| buffer.index = buffer_id; |
| if (TEMP_FAILURE_RETRY(ioctl(device_fd_.get(), VIDIOC_QUERYBUF, &buffer)) < |
| 0) { |
| PLOGF(ERROR) << "QUERYBUF fails"; |
| return false; |
| } |
| return buffer.flags & V4L2_BUF_FLAG_DONE; |
| } |
| |
| int V4L2CameraDevice::SetAutoFocus(bool enable) { |
| if (!autofocus_supported_ || enable == autofocus_on_) |
| return 0; |
| int ret; |
| struct v4l2_control control; |
| control.id = V4L2_CID_FOCUS_AUTO; |
| control.value = enable ? 1 : 0; |
| ret = TEMP_FAILURE_RETRY(ioctl(device_fd_.get(), VIDIOC_S_CTRL, &control)); |
| if (ret < 0) { |
| LOGF(WARNING) << "Failed to set V4L2_CID_FOCUS_AUTO"; |
| } else { |
| autofocus_on_ = enable; |
| } |
| return ret; |
| } |
| |
| float V4L2CameraDevice::GetFrameRate() { |
| return frame_rate_; |
| } |
| |
| int V4L2CameraDevice::SetFrameRate(float frame_rate) { |
| const int kFrameRatePrecision = 10000; |
| |
| if (!device_fd_.is_valid()) { |
| LOGF(ERROR) << "Device is not opened"; |
| return -ENODEV; |
| } |
| |
| v4l2_streamparm streamparm = {}; |
| streamparm.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; |
| |
| // The following line checks that the driver knows about framerate get/set. |
| if (TEMP_FAILURE_RETRY(ioctl(device_fd_.get(), VIDIOC_G_PARM, &streamparm)) >= |
| 0) { |
| // Now check if the device is able to accept a capture framerate set. |
| if (streamparm.parm.capture.capability & V4L2_CAP_TIMEPERFRAME) { |
| // |frame_rate| is float, approximate by a fraction. |
| streamparm.parm.capture.timeperframe.numerator = kFrameRatePrecision; |
| streamparm.parm.capture.timeperframe.denominator = |
| (frame_rate * kFrameRatePrecision); |
| |
| if (TEMP_FAILURE_RETRY( |
| ioctl(device_fd_.get(), VIDIOC_S_PARM, &streamparm)) < 0) { |
| LOGF(ERROR) << "Failed to set camera framerate"; |
| return -errno; |
| } |
| VLOGF(1) << "Actual camera driver framerate: " |
| << streamparm.parm.capture.timeperframe.denominator << "/" |
| << streamparm.parm.capture.timeperframe.numerator; |
| } |
| } |
| float fps = |
| static_cast<float>(streamparm.parm.capture.timeperframe.denominator) / |
| streamparm.parm.capture.timeperframe.numerator; |
| if (std::fabs(fps - frame_rate) > kFpsDifferenceThreshold) { |
| LOGF(ERROR) << "Unsupported frame rate " << frame_rate; |
| return -EINVAL; |
| } |
| |
| VLOGF(1) << "Successfully set the frame rate to: " << fps; |
| frame_rate_ = frame_rate; |
| |
| return 0; |
| } |
| |
| // static |
| const SupportedFormats V4L2CameraDevice::GetDeviceSupportedFormats( |
| const std::string& device_path) { |
| VLOGF(1) << "Query supported formats for " << device_path; |
| |
| base::ScopedFD fd(RetryDeviceOpen(device_path, O_RDONLY)); |
| if (!fd.is_valid()) { |
| PLOGF(ERROR) << "Failed to open " << device_path; |
| return {}; |
| } |
| |
| SupportedFormats formats; |
| v4l2_fmtdesc v4l2_format = {}; |
| v4l2_format.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; |
| for (; |
| TEMP_FAILURE_RETRY(ioctl(fd.get(), VIDIOC_ENUM_FMT, &v4l2_format)) == 0; |
| ++v4l2_format.index) { |
| SupportedFormat supported_format; |
| supported_format.fourcc = v4l2_format.pixelformat; |
| |
| v4l2_frmsizeenum frame_size = {}; |
| frame_size.pixel_format = v4l2_format.pixelformat; |
| for (; HANDLE_EINTR(ioctl(fd.get(), VIDIOC_ENUM_FRAMESIZES, &frame_size)) == |
| 0; |
| ++frame_size.index) { |
| if (frame_size.type == V4L2_FRMSIZE_TYPE_DISCRETE) { |
| supported_format.width = frame_size.discrete.width; |
| supported_format.height = frame_size.discrete.height; |
| } else if (frame_size.type == V4L2_FRMSIZE_TYPE_STEPWISE || |
| frame_size.type == V4L2_FRMSIZE_TYPE_CONTINUOUS) { |
| // TODO(henryhsu): see http://crbug.com/249953, support these devices. |
| LOGF(ERROR) << "Stepwise and continuous frame size are unsupported"; |
| return formats; |
| } |
| |
| supported_format.frame_rates = GetFrameRateList( |
| fd.get(), v4l2_format.pixelformat, frame_size.discrete.width, |
| frame_size.discrete.height); |
| formats.push_back(supported_format); |
| } |
| } |
| return formats; |
| } |
| |
| // static |
| std::vector<float> V4L2CameraDevice::GetFrameRateList(int fd, |
| uint32_t fourcc, |
| uint32_t width, |
| uint32_t height) { |
| std::vector<float> frame_rates; |
| |
| v4l2_frmivalenum frame_interval = {}; |
| frame_interval.pixel_format = fourcc; |
| frame_interval.width = width; |
| frame_interval.height = height; |
| for (; TEMP_FAILURE_RETRY( |
| ioctl(fd, VIDIOC_ENUM_FRAMEINTERVALS, &frame_interval)) == 0; |
| ++frame_interval.index) { |
| if (frame_interval.type == V4L2_FRMIVAL_TYPE_DISCRETE) { |
| if (frame_interval.discrete.numerator != 0) { |
| frame_rates.push_back( |
| frame_interval.discrete.denominator / |
| static_cast<float>(frame_interval.discrete.numerator)); |
| } |
| } else if (frame_interval.type == V4L2_FRMIVAL_TYPE_CONTINUOUS || |
| frame_interval.type == V4L2_FRMIVAL_TYPE_STEPWISE) { |
| // TODO(henryhsu): see http://crbug.com/249953, support these devices. |
| LOGF(ERROR) << "Stepwise and continuous frame interval are unsupported"; |
| return frame_rates; |
| } |
| } |
| // Some devices, e.g. Kinect, do not enumerate any frame rates, see |
| // http://crbug.com/412284. Set their frame_rate to zero. |
| if (frame_rates.empty()) { |
| frame_rates.push_back(0); |
| } |
| return frame_rates; |
| } |
| |
| // static |
| bool V4L2CameraDevice::IsCameraDevice(const std::string& device_path) { |
| // RetryDeviceOpen() assumes the device is a camera and waits until the camera |
| // is ready, so we use open() instead of RetryDeviceOpen() here. |
| base::ScopedFD fd(TEMP_FAILURE_RETRY(open(device_path.c_str(), O_RDONLY))); |
| if (!fd.is_valid()) { |
| PLOGF(ERROR) << "Failed to open " << device_path; |
| return false; |
| } |
| |
| v4l2_capability v4l2_cap; |
| if (TEMP_FAILURE_RETRY(ioctl(fd.get(), VIDIOC_QUERYCAP, &v4l2_cap)) != 0) { |
| return false; |
| } |
| |
| auto check_mask = [](uint32_t caps) { |
| const uint32_t kCaptureMask = |
| V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_VIDEO_CAPTURE_MPLANE; |
| // Old drivers use (CAPTURE | OUTPUT) for memory-to-memory video devices. |
| const uint32_t kOutputMask = |
| V4L2_CAP_VIDEO_OUTPUT | V4L2_CAP_VIDEO_OUTPUT_MPLANE; |
| const uint32_t kM2mMask = V4L2_CAP_VIDEO_M2M | V4L2_CAP_VIDEO_M2M_MPLANE; |
| return (caps & kCaptureMask) && !(caps & kOutputMask) && !(caps & kM2mMask); |
| }; |
| |
| // Prefer to use available capabilities of that specific device node instead |
| // of the physical device as a whole, so we can properly ignore the metadata |
| // device node. |
| if (v4l2_cap.capabilities & V4L2_CAP_DEVICE_CAPS) { |
| return check_mask(v4l2_cap.device_caps); |
| } else { |
| return check_mask(v4l2_cap.capabilities); |
| } |
| } |
| |
| // static |
| std::string V4L2CameraDevice::GetModelName(const std::string& device_path) { |
| auto get_by_interface = [&](std::string* name) { |
| base::FilePath real_path; |
| if (!base::NormalizeFilePath(base::FilePath(device_path), &real_path)) { |
| return false; |
| } |
| if (!base::MatchPattern(real_path.value(), "/dev/video*")) { |
| return false; |
| } |
| // /sys/class/video4linux/video{N}/device is a symlink to the corresponding |
| // USB device info directory. |
| auto interface_path = base::FilePath("/sys/class/video4linux") |
| .Append(real_path.BaseName()) |
| .Append("device/interface"); |
| return base::ReadFileToString(interface_path, name); |
| }; |
| |
| auto get_by_cap = [&](std::string* name) { |
| base::ScopedFD fd(RetryDeviceOpen(device_path, O_RDONLY)); |
| if (!fd.is_valid()) { |
| PLOGF(WARNING) << "Failed to open " << device_path; |
| return false; |
| } |
| |
| v4l2_capability cap; |
| if (TEMP_FAILURE_RETRY(ioctl(fd.get(), VIDIOC_QUERYCAP, &cap)) != 0) { |
| PLOGF(WARNING) << "Failed to query capability of " << device_path; |
| return false; |
| } |
| *name = std::string(reinterpret_cast<const char*>(cap.card)); |
| return true; |
| }; |
| |
| std::string name; |
| if (get_by_interface(&name)) { |
| return name; |
| } |
| if (get_by_cap(&name)) { |
| return name; |
| } |
| return "USB Camera"; |
| } |
| |
| // static |
| int V4L2CameraDevice::RetryDeviceOpen(const std::string& device_path, |
| int flags) { |
| const int64_t kDeviceOpenTimeOutInMilliseconds = 2000; |
| const int64_t kSleepTimeInMilliseconds = 100; |
| int fd; |
| base::ElapsedTimer timer; |
| int64_t elapsed_time = timer.Elapsed().InMillisecondsRoundedUp(); |
| while (elapsed_time < kDeviceOpenTimeOutInMilliseconds) { |
| fd = TEMP_FAILURE_RETRY(open(device_path.c_str(), flags)); |
| if (fd != -1) { |
| // Make sure ioctl is ok. Once ioctl failed, we have to re-open the |
| // device. |
| struct v4l2_fmtdesc v4l2_format = {}; |
| v4l2_format.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; |
| int ret = TEMP_FAILURE_RETRY(ioctl(fd, VIDIOC_ENUM_FMT, &v4l2_format)); |
| if (ret == -1) { |
| close(fd); |
| if (errno != EPERM) { |
| break; |
| } else { |
| VLOGF(1) << "Camera ioctl is not ready"; |
| } |
| } else { |
| // Only return fd when ioctl is ready. |
| if (elapsed_time >= kSleepTimeInMilliseconds) { |
| LOGF(INFO) << "Opened the camera device after waiting for " |
| << elapsed_time << " ms"; |
| } |
| return fd; |
| } |
| } else if (errno != ENOENT) { |
| break; |
| } |
| base::PlatformThread::Sleep( |
| base::TimeDelta::FromMilliseconds(kSleepTimeInMilliseconds)); |
| elapsed_time = timer.Elapsed().InMillisecondsRoundedUp(); |
| } |
| PLOGF(ERROR) << "Failed to open " << device_path; |
| return -1; |
| } |
| |
| // static |
| clockid_t V4L2CameraDevice::GetUvcClock() { |
| static const clockid_t kUvcClock = [] { |
| const base::FilePath kClockPath("/sys/module/uvcvideo/parameters/clock"); |
| std::string clock; |
| if (base::ReadFileToString(kClockPath, &clock)) { |
| if (clock.find("REALTIME") != std::string::npos) { |
| return CLOCK_REALTIME; |
| } else if (clock.find("BOOTTIME") != std::string::npos) { |
| return CLOCK_BOOTTIME; |
| } else { |
| return CLOCK_MONOTONIC; |
| } |
| } |
| // Use UVC default clock. |
| return CLOCK_MONOTONIC; |
| }(); |
| return kUvcClock; |
| } |
| |
| // static |
| PowerLineFrequency V4L2CameraDevice::GetPowerLineFrequency( |
| const std::string& device_path) { |
| base::ScopedFD fd(RetryDeviceOpen(device_path, O_RDONLY)); |
| if (!fd.is_valid()) { |
| PLOGF(ERROR) << "Failed to open " << device_path; |
| return PowerLineFrequency::FREQ_ERROR; |
| } |
| |
| struct v4l2_queryctrl query = {}; |
| query.id = V4L2_CID_POWER_LINE_FREQUENCY; |
| if (TEMP_FAILURE_RETRY(ioctl(fd.get(), VIDIOC_QUERYCTRL, &query)) < 0) { |
| LOGF(ERROR) << "Power line frequency should support auto or 50/60Hz"; |
| return PowerLineFrequency::FREQ_ERROR; |
| } |
| |
| PowerLineFrequency frequency = GetPowerLineFrequencyForLocation(); |
| if (frequency == PowerLineFrequency::FREQ_DEFAULT) { |
| switch (query.default_value) { |
| case V4L2_CID_POWER_LINE_FREQUENCY_50HZ: |
| frequency = PowerLineFrequency::FREQ_50HZ; |
| break; |
| case V4L2_CID_POWER_LINE_FREQUENCY_60HZ: |
| frequency = PowerLineFrequency::FREQ_60HZ; |
| break; |
| case V4L2_CID_POWER_LINE_FREQUENCY_AUTO: |
| frequency = PowerLineFrequency::FREQ_AUTO; |
| break; |
| default: |
| break; |
| } |
| } |
| |
| // Prefer auto setting if camera module supports auto mode. |
| if (query.maximum == V4L2_CID_POWER_LINE_FREQUENCY_AUTO) { |
| frequency = PowerLineFrequency::FREQ_AUTO; |
| } else if (query.minimum >= V4L2_CID_POWER_LINE_FREQUENCY_60HZ) { |
| // TODO(shik): Handle this more gracefully for external camera |
| LOGF(ERROR) << "Camera module should at least support 50/60Hz"; |
| return PowerLineFrequency::FREQ_ERROR; |
| } |
| return frequency; |
| } |
| |
| // static |
| bool V4L2CameraDevice::IsAutoFocusSupported(const std::string& device_path) { |
| base::ScopedFD fd(RetryDeviceOpen(device_path, O_RDONLY)); |
| if (!fd.is_valid()) { |
| PLOGF(ERROR) << "Failed to open " << device_path; |
| return false; |
| } |
| struct v4l2_queryctrl query_ctrl; |
| query_ctrl.id = V4L2_CID_FOCUS_AUTO; |
| if (TEMP_FAILURE_RETRY(ioctl(fd.get(), VIDIOC_QUERYCTRL, &query_ctrl)) < 0) { |
| LOGF(WARNING) << "Failed to query V4L2_CID_FOCUS_AUTO"; |
| return false; |
| } |
| return !(query_ctrl.flags & V4L2_CTRL_FLAG_DISABLED); |
| } |
| |
| // static |
| bool V4L2CameraDevice::IsConstantFrameRateSupported( |
| const std::string& device_path) { |
| base::ScopedFD fd(RetryDeviceOpen(device_path, O_RDONLY)); |
| if (!fd.is_valid()) { |
| PLOGF(ERROR) << "Failed to open " << device_path; |
| return false; |
| } |
| struct v4l2_queryctrl query_ctrl; |
| query_ctrl.id = V4L2_CID_EXPOSURE_AUTO_PRIORITY; |
| if (TEMP_FAILURE_RETRY(ioctl(fd.get(), VIDIOC_QUERYCTRL, &query_ctrl)) < 0) { |
| LOGF(WARNING) << "Failed to query V4L2_CID_EXPOSURE_AUTO_PRIORITY"; |
| return false; |
| } |
| return !(query_ctrl.flags & V4L2_CTRL_FLAG_DISABLED); |
| } |
| |
| int V4L2CameraDevice::SetPowerLineFrequency(PowerLineFrequency setting) { |
| int v4l2_freq_setting = V4L2_CID_POWER_LINE_FREQUENCY_DISABLED; |
| switch (setting) { |
| case PowerLineFrequency::FREQ_50HZ: |
| v4l2_freq_setting = V4L2_CID_POWER_LINE_FREQUENCY_50HZ; |
| break; |
| case PowerLineFrequency::FREQ_60HZ: |
| v4l2_freq_setting = V4L2_CID_POWER_LINE_FREQUENCY_60HZ; |
| break; |
| case PowerLineFrequency::FREQ_AUTO: |
| v4l2_freq_setting = V4L2_CID_POWER_LINE_FREQUENCY_AUTO; |
| break; |
| default: |
| LOGF(ERROR) << "Invalid setting for power line frequency: " |
| << static_cast<int>(setting); |
| return -EINVAL; |
| } |
| |
| struct v4l2_control control = {}; |
| control.id = V4L2_CID_POWER_LINE_FREQUENCY; |
| control.value = v4l2_freq_setting; |
| if (TEMP_FAILURE_RETRY(ioctl(device_fd_.get(), VIDIOC_S_CTRL, &control)) < |
| 0) { |
| LOGF(ERROR) << "Error setting power line frequency to " |
| << v4l2_freq_setting; |
| return -EINVAL; |
| } |
| VLOGF(1) << "Set power line frequency(" << static_cast<int>(setting) |
| << ") successfully"; |
| return 0; |
| } |
| |
| bool V4L2CameraDevice::IsExternalCamera() { |
| return device_info_.lens_facing == ANDROID_LENS_FACING_EXTERNAL; |
| } |
| |
| } // namespace cros |