blob: 9ced0ae5cbe6f1ca24edeb855ec450204435cc71 [file] [log] [blame]
/*
* 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.
*/
#include "modules/video_capture/linux/device_info_linux.h"
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <unistd.h>
// v4l includes
#include <linux/videodev2.h>
#include "rtc_base/logging.h"
namespace webrtc {
namespace videocapturemodule {
VideoCaptureModule::DeviceInfo* VideoCaptureImpl::CreateDeviceInfo() {
return new videocapturemodule::DeviceInfoLinux();
}
DeviceInfoLinux::DeviceInfoLinux() : DeviceInfoImpl() {}
int32_t DeviceInfoLinux::Init() {
return 0;
}
DeviceInfoLinux::~DeviceInfoLinux() {}
uint32_t DeviceInfoLinux::NumberOfDevices() {
RTC_LOG(LS_INFO) << __FUNCTION__;
uint32_t count = 0;
char device[20];
int fd = -1;
/* detect /dev/video [0-63]VideoCaptureModule entries */
for (int n = 0; n < 64; n++) {
sprintf(device, "/dev/video%d", n);
if ((fd = open(device, O_RDONLY)) != -1) {
close(fd);
count++;
}
}
return count;
}
int32_t DeviceInfoLinux::GetDeviceName(uint32_t deviceNumber,
char* deviceNameUTF8,
uint32_t deviceNameLength,
char* deviceUniqueIdUTF8,
uint32_t deviceUniqueIdUTF8Length,
char* /*productUniqueIdUTF8*/,
uint32_t /*productUniqueIdUTF8Length*/) {
RTC_LOG(LS_INFO) << __FUNCTION__;
// Travel through /dev/video [0-63]
uint32_t count = 0;
char device[20];
int fd = -1;
bool found = false;
for (int n = 0; n < 64; n++) {
sprintf(device, "/dev/video%d", n);
if ((fd = open(device, O_RDONLY)) != -1) {
if (count == deviceNumber) {
// Found the device
found = true;
break;
} else {
close(fd);
count++;
}
}
}
if (!found)
return -1;
// query device capabilities
struct v4l2_capability cap;
if (ioctl(fd, VIDIOC_QUERYCAP, &cap) < 0) {
RTC_LOG(LS_INFO) << "error in querying the device capability for device "
<< device << ". errno = " << errno;
close(fd);
return -1;
}
close(fd);
char cameraName[64];
memset(deviceNameUTF8, 0, deviceNameLength);
memcpy(cameraName, cap.card, sizeof(cap.card));
if (deviceNameLength >= strlen(cameraName)) {
memcpy(deviceNameUTF8, cameraName, strlen(cameraName));
} else {
RTC_LOG(LS_INFO) << "buffer passed is too small";
return -1;
}
if (cap.bus_info[0] != 0) // may not available in all drivers
{
// copy device id
if (deviceUniqueIdUTF8Length >= strlen((const char*)cap.bus_info)) {
memset(deviceUniqueIdUTF8, 0, deviceUniqueIdUTF8Length);
memcpy(deviceUniqueIdUTF8, cap.bus_info,
strlen((const char*)cap.bus_info));
} else {
RTC_LOG(LS_INFO) << "buffer passed is too small";
return -1;
}
}
return 0;
}
int32_t DeviceInfoLinux::CreateCapabilityMap(const char* deviceUniqueIdUTF8) {
int fd;
char device[32];
bool found = false;
const int32_t deviceUniqueIdUTF8Length =
(int32_t)strlen((char*)deviceUniqueIdUTF8);
if (deviceUniqueIdUTF8Length > kVideoCaptureUniqueNameLength) {
RTC_LOG(LS_INFO) << "Device name too long";
return -1;
}
RTC_LOG(LS_INFO) << "CreateCapabilityMap called for device "
<< deviceUniqueIdUTF8;
/* detect /dev/video [0-63] entries */
for (int n = 0; n < 64; ++n) {
sprintf(device, "/dev/video%d", n);
fd = open(device, O_RDONLY);
if (fd == -1)
continue;
// query device capabilities
struct v4l2_capability cap;
if (ioctl(fd, VIDIOC_QUERYCAP, &cap) == 0) {
if (cap.bus_info[0] != 0) {
if (strncmp((const char*)cap.bus_info, (const char*)deviceUniqueIdUTF8,
strlen((const char*)deviceUniqueIdUTF8)) ==
0) // match with device id
{
found = true;
break; // fd matches with device unique id supplied
}
} else // match for device name
{
if (IsDeviceNameMatches((const char*)cap.card,
(const char*)deviceUniqueIdUTF8)) {
found = true;
break;
}
}
}
close(fd); // close since this is not the matching device
}
if (!found) {
RTC_LOG(LS_INFO) << "no matching device found";
return -1;
}
// now fd will point to the matching device
// reset old capability list.
_captureCapabilities.clear();
int size = FillCapabilities(fd);
close(fd);
// Store the new used device name
_lastUsedDeviceNameLength = deviceUniqueIdUTF8Length;
_lastUsedDeviceName =
(char*)realloc(_lastUsedDeviceName, _lastUsedDeviceNameLength + 1);
memcpy(_lastUsedDeviceName, deviceUniqueIdUTF8,
_lastUsedDeviceNameLength + 1);
RTC_LOG(LS_INFO) << "CreateCapabilityMap " << _captureCapabilities.size();
return size;
}
bool DeviceInfoLinux::IsDeviceNameMatches(const char* name,
const char* deviceUniqueIdUTF8) {
if (strncmp(deviceUniqueIdUTF8, name, strlen(name)) == 0)
return true;
return false;
}
int32_t DeviceInfoLinux::FillCapabilities(int fd) {
// set image format
struct v4l2_format video_fmt;
memset(&video_fmt, 0, sizeof(struct v4l2_format));
video_fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
video_fmt.fmt.pix.sizeimage = 0;
int totalFmts = 4;
unsigned int videoFormats[] = {V4L2_PIX_FMT_MJPEG, V4L2_PIX_FMT_YUV420,
V4L2_PIX_FMT_YUYV, V4L2_PIX_FMT_UYVY};
int sizes = 13;
unsigned int size[][2] = {{128, 96}, {160, 120}, {176, 144}, {320, 240},
{352, 288}, {640, 480}, {704, 576}, {800, 600},
{960, 720}, {1280, 720}, {1024, 768}, {1440, 1080},
{1920, 1080}};
int index = 0;
for (int fmts = 0; fmts < totalFmts; fmts++) {
for (int i = 0; i < sizes; i++) {
video_fmt.fmt.pix.pixelformat = videoFormats[fmts];
video_fmt.fmt.pix.width = size[i][0];
video_fmt.fmt.pix.height = size[i][1];
if (ioctl(fd, VIDIOC_TRY_FMT, &video_fmt) >= 0) {
if ((video_fmt.fmt.pix.width == size[i][0]) &&
(video_fmt.fmt.pix.height == size[i][1])) {
VideoCaptureCapability cap;
cap.width = video_fmt.fmt.pix.width;
cap.height = video_fmt.fmt.pix.height;
if (videoFormats[fmts] == V4L2_PIX_FMT_YUYV) {
cap.videoType = VideoType::kYUY2;
} else if (videoFormats[fmts] == V4L2_PIX_FMT_YUV420) {
cap.videoType = VideoType::kI420;
} else if (videoFormats[fmts] == V4L2_PIX_FMT_MJPEG) {
cap.videoType = VideoType::kMJPEG;
} else if (videoFormats[fmts] == V4L2_PIX_FMT_UYVY) {
cap.videoType = VideoType::kUYVY;
}
// get fps of current camera mode
// V4l2 does not have a stable method of knowing so we just guess.
if (cap.width >= 800 && cap.videoType != VideoType::kMJPEG) {
cap.maxFPS = 15;
} else {
cap.maxFPS = 30;
}
_captureCapabilities.push_back(cap);
index++;
RTC_LOG(LS_VERBOSE) << "Camera capability, width:" << cap.width
<< " height:" << cap.height
<< " type:" << static_cast<int32_t>(cap.videoType)
<< " fps:" << cap.maxFPS;
}
}
}
}
RTC_LOG(LS_INFO) << "CreateCapabilityMap " << _captureCapabilities.size();
return _captureCapabilities.size();
}
} // namespace videocapturemodule
} // namespace webrtc