299 lines
9.0 KiB
C++
299 lines
9.0 KiB
C++
/*
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* Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#include "modules/video_capture/linux/device_info_linux.h"
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#include <errno.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/ioctl.h>
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#include <unistd.h>
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// v4l includes
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#include <linux/videodev2.h>
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#include <vector>
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#include "modules/video_capture/video_capture.h"
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#include "modules/video_capture/video_capture_defines.h"
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#include "modules/video_capture/video_capture_impl.h"
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#include "rtc_base/logging.h"
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namespace webrtc {
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namespace videocapturemodule {
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VideoCaptureModule::DeviceInfo* VideoCaptureImpl::CreateDeviceInfo() {
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return new videocapturemodule::DeviceInfoLinux();
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}
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DeviceInfoLinux::DeviceInfoLinux() : DeviceInfoImpl() {}
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int32_t DeviceInfoLinux::Init() {
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return 0;
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}
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DeviceInfoLinux::~DeviceInfoLinux() {}
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uint32_t DeviceInfoLinux::NumberOfDevices() {
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RTC_LOG(LS_INFO) << __FUNCTION__;
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uint32_t count = 0;
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char device[20];
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int fd = -1;
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struct v4l2_capability cap;
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/* detect /dev/video [0-63]VideoCaptureModule entries */
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for (int n = 0; n < 64; n++) {
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sprintf(device, "/dev/video%d", n);
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if ((fd = open(device, O_RDONLY)) != -1) {
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// query device capabilities and make sure this is a video capture device
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if (ioctl(fd, VIDIOC_QUERYCAP, &cap) < 0 ||
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!(cap.device_caps & V4L2_CAP_VIDEO_CAPTURE)) {
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close(fd);
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continue;
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}
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close(fd);
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count++;
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}
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}
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return count;
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}
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int32_t DeviceInfoLinux::GetDeviceName(uint32_t deviceNumber,
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char* deviceNameUTF8,
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uint32_t deviceNameLength,
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char* deviceUniqueIdUTF8,
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uint32_t deviceUniqueIdUTF8Length,
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char* /*productUniqueIdUTF8*/,
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uint32_t /*productUniqueIdUTF8Length*/) {
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RTC_LOG(LS_INFO) << __FUNCTION__;
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// Travel through /dev/video [0-63]
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uint32_t count = 0;
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char device[20];
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int fd = -1;
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bool found = false;
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struct v4l2_capability cap;
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for (int n = 0; n < 64; n++) {
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sprintf(device, "/dev/video%d", n);
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if ((fd = open(device, O_RDONLY)) != -1) {
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// query device capabilities and make sure this is a video capture device
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if (ioctl(fd, VIDIOC_QUERYCAP, &cap) < 0 ||
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!(cap.device_caps & V4L2_CAP_VIDEO_CAPTURE)) {
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close(fd);
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continue;
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}
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if (count == deviceNumber) {
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// Found the device
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found = true;
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break;
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} else {
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close(fd);
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count++;
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}
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}
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}
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if (!found)
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return -1;
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// query device capabilities
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if (ioctl(fd, VIDIOC_QUERYCAP, &cap) < 0) {
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RTC_LOG(LS_INFO) << "error in querying the device capability for device "
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<< device << ". errno = " << errno;
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close(fd);
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return -1;
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}
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close(fd);
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char cameraName[64];
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memset(deviceNameUTF8, 0, deviceNameLength);
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memcpy(cameraName, cap.card, sizeof(cap.card));
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if (deviceNameLength >= strlen(cameraName)) {
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memcpy(deviceNameUTF8, cameraName, strlen(cameraName));
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} else {
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RTC_LOG(LS_INFO) << "buffer passed is too small";
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return -1;
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}
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if (cap.bus_info[0] != 0) // may not available in all drivers
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{
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// copy device id
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if (deviceUniqueIdUTF8Length >= strlen((const char*)cap.bus_info)) {
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memset(deviceUniqueIdUTF8, 0, deviceUniqueIdUTF8Length);
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memcpy(deviceUniqueIdUTF8, cap.bus_info,
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strlen((const char*)cap.bus_info));
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} else {
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RTC_LOG(LS_INFO) << "buffer passed is too small";
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return -1;
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}
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}
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return 0;
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}
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int32_t DeviceInfoLinux::CreateCapabilityMap(const char* deviceUniqueIdUTF8) {
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int fd;
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char device[32];
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bool found = false;
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const int32_t deviceUniqueIdUTF8Length =
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(int32_t)strlen((char*)deviceUniqueIdUTF8);
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if (deviceUniqueIdUTF8Length > kVideoCaptureUniqueNameLength) {
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RTC_LOG(LS_INFO) << "Device name too long";
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return -1;
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}
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RTC_LOG(LS_INFO) << "CreateCapabilityMap called for device "
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<< deviceUniqueIdUTF8;
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/* detect /dev/video [0-63] entries */
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for (int n = 0; n < 64; ++n) {
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sprintf(device, "/dev/video%d", n);
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fd = open(device, O_RDONLY);
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if (fd == -1)
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continue;
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// query device capabilities
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struct v4l2_capability cap;
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if (ioctl(fd, VIDIOC_QUERYCAP, &cap) == 0) {
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// skip devices without video capture capability
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if (!(cap.device_caps & V4L2_CAP_VIDEO_CAPTURE)) {
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continue;
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}
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if (cap.bus_info[0] != 0) {
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if (strncmp((const char*)cap.bus_info, (const char*)deviceUniqueIdUTF8,
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strlen((const char*)deviceUniqueIdUTF8)) ==
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0) // match with device id
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{
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found = true;
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break; // fd matches with device unique id supplied
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}
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} else // match for device name
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{
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if (IsDeviceNameMatches((const char*)cap.card,
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(const char*)deviceUniqueIdUTF8)) {
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found = true;
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break;
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}
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}
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}
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close(fd); // close since this is not the matching device
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}
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if (!found) {
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RTC_LOG(LS_INFO) << "no matching device found";
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return -1;
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}
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// now fd will point to the matching device
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// reset old capability list.
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_captureCapabilities.clear();
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int size = FillCapabilities(fd);
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close(fd);
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// Store the new used device name
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_lastUsedDeviceNameLength = deviceUniqueIdUTF8Length;
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_lastUsedDeviceName =
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(char*)realloc(_lastUsedDeviceName, _lastUsedDeviceNameLength + 1);
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memcpy(_lastUsedDeviceName, deviceUniqueIdUTF8,
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_lastUsedDeviceNameLength + 1);
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RTC_LOG(LS_INFO) << "CreateCapabilityMap " << _captureCapabilities.size();
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return size;
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}
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int32_t DeviceInfoLinux::DisplayCaptureSettingsDialogBox(
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const char* /*deviceUniqueIdUTF8*/,
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const char* /*dialogTitleUTF8*/,
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void* /*parentWindow*/,
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uint32_t /*positionX*/,
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uint32_t /*positionY*/) {
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return -1;
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}
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bool DeviceInfoLinux::IsDeviceNameMatches(const char* name,
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const char* deviceUniqueIdUTF8) {
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if (strncmp(deviceUniqueIdUTF8, name, strlen(name)) == 0)
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return true;
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return false;
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}
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int32_t DeviceInfoLinux::FillCapabilities(int fd) {
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// set image format
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struct v4l2_format video_fmt;
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memset(&video_fmt, 0, sizeof(struct v4l2_format));
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video_fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
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video_fmt.fmt.pix.sizeimage = 0;
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int totalFmts = 4;
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unsigned int videoFormats[] = {V4L2_PIX_FMT_MJPEG, V4L2_PIX_FMT_YUV420,
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V4L2_PIX_FMT_YUYV, V4L2_PIX_FMT_UYVY};
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int sizes = 13;
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unsigned int size[][2] = {{128, 96}, {160, 120}, {176, 144}, {320, 240},
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{352, 288}, {640, 480}, {704, 576}, {800, 600},
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{960, 720}, {1280, 720}, {1024, 768}, {1440, 1080},
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{1920, 1080}};
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for (int fmts = 0; fmts < totalFmts; fmts++) {
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for (int i = 0; i < sizes; i++) {
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video_fmt.fmt.pix.pixelformat = videoFormats[fmts];
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video_fmt.fmt.pix.width = size[i][0];
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video_fmt.fmt.pix.height = size[i][1];
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if (ioctl(fd, VIDIOC_TRY_FMT, &video_fmt) >= 0) {
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if ((video_fmt.fmt.pix.width == size[i][0]) &&
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(video_fmt.fmt.pix.height == size[i][1])) {
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VideoCaptureCapability cap;
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cap.width = video_fmt.fmt.pix.width;
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cap.height = video_fmt.fmt.pix.height;
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if (videoFormats[fmts] == V4L2_PIX_FMT_YUYV) {
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cap.videoType = VideoType::kYUY2;
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} else if (videoFormats[fmts] == V4L2_PIX_FMT_YUV420) {
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cap.videoType = VideoType::kI420;
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} else if (videoFormats[fmts] == V4L2_PIX_FMT_MJPEG) {
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cap.videoType = VideoType::kMJPEG;
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} else if (videoFormats[fmts] == V4L2_PIX_FMT_UYVY) {
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cap.videoType = VideoType::kUYVY;
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}
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// get fps of current camera mode
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// V4l2 does not have a stable method of knowing so we just guess.
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if (cap.width >= 800 && cap.videoType != VideoType::kMJPEG) {
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cap.maxFPS = 15;
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} else {
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cap.maxFPS = 30;
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}
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_captureCapabilities.push_back(cap);
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RTC_LOG(LS_VERBOSE) << "Camera capability, width:" << cap.width
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<< " height:" << cap.height
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<< " type:" << static_cast<int32_t>(cap.videoType)
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<< " fps:" << cap.maxFPS;
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}
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}
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}
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}
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RTC_LOG(LS_INFO) << "CreateCapabilityMap " << _captureCapabilities.size();
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return _captureCapabilities.size();
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}
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} // namespace videocapturemodule
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} // namespace webrtc
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