int check_capture_capabilities_v4l2(int fd, char *file) {
struct v4l2_capability cap;
dprint(LIBV4L_LOG_SOURCE_CAPTURE, LIBV4L_LOG_LEVEL_DEBUG, "CAP: Checking capture device\n");
CLEAR(cap);
if (-1 == check_v4l2(fd, &cap)) {
dprint(LIBV4L_LOG_SOURCE_CAPTURE, LIBV4L_LOG_LEVEL_ERR, "CAP: Not a V4L2 device.\n");
return -1;
}
if (!(cap.capabilities & V4L2_CAP_VIDEO_CAPTURE)) {
info("The device %s seems to be a valid V4L2 device but without capture capability.\n", file);
info("Please let the author know about this error.\n");
info("See the ISSUES section in the libv4l README file.\n");
info("Listing the reported capabilities:\n");
list_cap_v4l2(fd);
return -1;
}
if (!(cap.capabilities & V4L2_CAP_STREAMING)) {
info("The device %s seems to be a valid V4L2 device with capture capability, but\n", file);
info("the device does NOT support streaming. Please let the author know about this error.\n");
info("See the ISSUES section in the libv4l README file.\n");
info("Listing the reported capabilities:\n");
list_cap_v4l2(fd);
return -1;
}
return 0;
}
int set_cap_param_v4l2(struct video_device *vdev, int *palettes, int nb) {
struct capture_device *c = vdev->capture;
int ret = 0;
int def[NB_SUPPORTED_PALETTE] = DEFAULT_PALETTE_ORDER;
dprint(LIBVIDEO_SOURCE_CAP, LIBVIDEO_LOG_DEBUG,
"CAP: Setting capture parameters on device %s.\n", vdev->file);
if(nb<0 || nb>=NB_SUPPORTED_PALETTE) {
dprint(LIBVIDEO_SOURCE_CAP, LIBVIDEO_LOG_ERR,
"CAP: Incorrect number of palettes (%d)\n", nb);
return LIBVIDEO_ERR_FORMAT;
}
if(nb==0 || palettes==NULL) {
dprint(LIBVIDEO_SOURCE_CAP, LIBVIDEO_LOG_DEBUG,
"CAP: No palettes supplied, trying default order.\n");
palettes = def;
nb = NB_SUPPORTED_PALETTE;
}
//set desired standard
if (set_std(c, vdev->fd) !=0 ) {
ret = LIBVIDEO_ERR_STD;
goto fail;
}
//set desired input
if (set_input(c, vdev->fd) != 0) {
ret = LIBVIDEO_ERR_CHANNEL;
goto fail;
}
//Set image format
if (set_image_format(c, palettes, nb, vdev->fd) != 0) {
ret = LIBVIDEO_ERR_FORMAT;
goto fail;
}
//Set crop format
if (set_crop(c, vdev->fd) != 0) {
info("Listing the reported capabilities:\n");
ret = LIBVIDEO_ERR_CROP;
goto fail;
}
//set FPS
set_param(c, vdev->fd);
return ret;
fail:
info("Listing the reported capabilities:\n");
list_cap_v4l2(vdev->fd);
return ret;
}
