1#include "camera.h"
 2#include "common/debug.h"
 3#include "common/io.h"
 4
 5#include <unistd.h>
 6#include <fcntl.h>
 7#include <string.h>
 8#include <sys/ioctl.h>
 9
10#if FF_HAVE_LINUX_VIDEODEV2
11    #include <linux/videodev2.h>
12#elif __has_include(<sys/videoio.h>) // OpenBSD
13    #include <sys/videoio.h>
14    #define FF_HAVE_LINUX_VIDEODEV2 1
15#endif
16
17const char* ffDetectCamera(FFlist* result) {
18#if FF_HAVE_LINUX_VIDEODEV2
19    char path[] = "/dev/videoN";
20
21    for (uint32_t i = 0; i <= 9; ++i) {
22        path[ARRAY_SIZE(path) - 2] = (char) (i + '0');
23        FF_AUTO_CLOSE_FD int fd = open(path, O_RDONLY | O_CLOEXEC);
24        if (fd < 0) {
25            if (errno == ENOENT) {
26                break;
27            }
28            if (errno == ENXIO) {
29                continue;
30            }
31            FF_DEBUG("Failed to open /dev/videoN: %s", strerror(errno));
32            return "Failed to open /dev/videoN";
33        }
34
35        struct v4l2_capability cap = {};
36        if (ioctl(fd, VIDIOC_QUERYCAP, &cap) < 0 || !(cap.capabilities & V4L2_CAP_VIDEO_CAPTURE)) {
37            continue;
38        }
39
40        struct v4l2_format fmt = { .type = V4L2_BUF_TYPE_VIDEO_CAPTURE };
41        if (ioctl(fd, VIDIOC_G_FMT, &fmt) < 0) {
42            continue;
43        }
44
45        FFCameraResult* camera = FF_LIST_ADD(FFCameraResult, *result);
46        ffStrbufInitS(&camera->name, (const char*) cap.card);
47        ffStrbufInit(&camera->vendor);
48        ffStrbufInitS(&camera->id, (const char*) cap.bus_info);
49        switch (fmt.fmt.pix.colorspace) {
50            case V4L2_COLORSPACE_SMPTE170M:
51                ffStrbufInitStatic(&camera->colorspace, "SMPTE 170M");
52                break;
53            case V4L2_COLORSPACE_SMPTE240M:
54                ffStrbufInitStatic(&camera->colorspace, "SMPTE 240M");
55                break;
56            case V4L2_COLORSPACE_BT878:
57                ffStrbufInitStatic(&camera->colorspace, "BT.878");
58                break;
59            case V4L2_COLORSPACE_470_SYSTEM_M:
60                ffStrbufInitStatic(&camera->colorspace, "NTSC");
61                break;
62            case V4L2_COLORSPACE_470_SYSTEM_BG:
63                ffStrbufInitStatic(&camera->colorspace, "EBU 3213");
64                break;
65            case V4L2_COLORSPACE_JPEG:
66                ffStrbufInitStatic(&camera->colorspace, "JPEG");
67                break;
68            case V4L2_COLORSPACE_REC709:
69            case V4L2_COLORSPACE_SRGB:
70                ffStrbufInitStatic(&camera->colorspace, "sRGB");
71                break;
72            case 9 /* V4L2_COLORSPACE_OPRGB */:
73                ffStrbufInitStatic(&camera->colorspace, "Adobe RGB");
74                break;
75            case 10 /* V4L2_COLORSPACE_BT2020 */:
76                ffStrbufInitStatic(&camera->colorspace, "BT.2020");
77                break;
78            case 11 /* V4L2_COLORSPACE_RAW */:
79                ffStrbufInitStatic(&camera->colorspace, "RAW");
80                break;
81            case 12 /* V4L2_COLORSPACE_DCI_P3 */:
82                ffStrbufInitStatic(&camera->colorspace, "DCI-P3");
83                break;
84            default:
85                ffStrbufInit(&camera->colorspace);
86                break;
87        }
88        camera->width = fmt.fmt.pix.width;
89        camera->height = fmt.fmt.pix.height;
90    }
91
92    return nullptr;
93#else
94    FF_UNUSED(result);
95    return "Fastfetch was compiled without <linux/videodev2.h>";
96#endif
97}