static int enum_frame_sizes(int fd, int pixfmt)
{
int ret;
struct v4l2_frmsizeenum fsize;
memset(&fsize, 0, sizeof(struct v4l2_frmsizeenum));
fsize.index = 0;
fsize.pixel_format = pixfmt;
while ((ret = ioctl(fd, VIDIOC_ENUM_FRAMESIZES, &fsize)) == 0)
{
if (fsize.type == V4L2_FRMSIZE_TYPE_DISCRETE)
{
printf("{ discrete: width = %u, height = %u }\n",
fsize.discrete.width, fsize.discrete.height);
ret = enum_frame_intervals(fd, pixfmt,
fsize.discrete.width,
fsize.discrete.height);
if (ret != 0)
{
printf(" Unable to enumerate frame sizes.\n");
}
}
else if (fsize.type == V4L2_FRMSIZE_TYPE_CONTINUOUS)
{
printf("{ continuous: min { width = %u, height = %u } .. "
"max { width = %u, height = %u } }\n",
fsize.stepwise.min_width, fsize.stepwise.min_height,
fsize.stepwise.max_width, fsize.stepwise.max_height);
printf(" Refusing to enumerate frame intervals.\n");
break;
}
else if (fsize.type == V4L2_FRMSIZE_TYPE_STEPWISE)
{
printf("{ stepwise: min { width = %u, height = %u } .. "
"max { width = %u, height = %u } / "
"stepsize { width = %u, height = %u } }\n",
fsize.stepwise.min_width, fsize.stepwise.min_height,
fsize.stepwise.max_width, fsize.stepwise.max_height,
fsize.stepwise.step_width, fsize.stepwise.step_height);
printf(" Refusing to enumerate frame intervals.\n");
break;
}
fsize.index++;
}
if (ret != 0 && errno != EINVAL)
{
printf("ERROR enumerating frame sizes: %d\n", errno);
return errno;
}
return 0;
}
/* enumerate frame sizes
* args:
* listVidFormats: array of VidFormats (list of video formats)
* pixfmt: v4l2 pixel format that we want to list frame sizes for
* fmtind: format list current index
* width: pointer to integer containing the selected video width
* height: pointer to integer containing the selected video height
* fd: device file descriptor
*
* returns 0 if enumeration succeded or errno otherwise */
static int enum_frame_sizes(VidFormats *listVidFormats, __u32 pixfmt, int fmtind, int *width, int *height, int fd)
{
int ret=0;
int fsizeind=0; /*index for supported sizes*/
listVidFormats[fmtind-1].listVidCap = NULL;
struct v4l2_frmsizeenum fsize;
memset(&fsize, 0, sizeof(fsize));
fsize.index = 0;
fsize.pixel_format = pixfmt;
while ((ret = xioctl(fd, VIDIOC_ENUM_FRAMESIZES, &fsize)) == 0)
{
fsize.index++;
if (fsize.type == V4L2_FRMSIZE_TYPE_DISCRETE)
{
printf("{ discrete: width = %u, height = %u }\n",
fsize.discrete.width, fsize.discrete.height);
fsizeind++;
listVidFormats[fmtind-1].listVidCap = (VidCap*) realloc(
listVidFormats[fmtind-1].listVidCap,
sizeof(VidCap) * fsizeind);
listVidFormats[fmtind-1].listVidCap[fsizeind-1].width = fsize.discrete.width;
listVidFormats[fmtind-1].listVidCap[fsizeind-1].height = fsize.discrete.height;
ret = enum_frame_intervals(listVidFormats,
pixfmt,
fsize.discrete.width,
fsize.discrete.height,
fmtind,
fsizeind,
fd);
if (ret != 0) perror(" Unable to enumerate frame sizes");
}
else if (fsize.type == V4L2_FRMSIZE_TYPE_CONTINUOUS)
{
printf("{ continuous: min { width = %u, height = %u } .. "
"max { width = %u, height = %u } }\n",
fsize.stepwise.min_width, fsize.stepwise.min_height,
fsize.stepwise.max_width, fsize.stepwise.max_height);
printf(" will not enumerate frame intervals.\n");
}
else if (fsize.type == V4L2_FRMSIZE_TYPE_STEPWISE)
{
printf("{ stepwise: min { width = %u, height = %u } .. "
"max { width = %u, height = %u } / "
"stepsize { width = %u, height = %u } }\n",
fsize.stepwise.min_width, fsize.stepwise.min_height,
fsize.stepwise.max_width, fsize.stepwise.max_height,
fsize.stepwise.step_width, fsize.stepwise.step_height);
printf(" will not enumerate frame intervals.\n");
}
else
{
fprintf(stderr," fsize.type not supported: %d\n", fsize.type);
fprintf(stderr," (Discrete: %d Continuous: %d Stepwise: %d)\n",
V4L2_FRMSIZE_TYPE_DISCRETE,
V4L2_FRMSIZE_TYPE_CONTINUOUS,
V4L2_FRMSIZE_TYPE_STEPWISE);
}
}
if (ret != 0 && errno != EINVAL)
{
perror("VIDIOC_ENUM_FRAMESIZES - Error enumerating frame sizes");
return errno;
}
else if ((ret != 0) && (fsizeind == 0))
{
/* ------ gspca doesn't enumerate frame sizes ------ */
/* negotiate with VIDIOC_TRY_FMT instead */
fsizeind++;
struct v4l2_format fmt;
fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
fmt.fmt.pix.width = *width;
fmt.fmt.pix.height = *height;
fmt.fmt.pix.pixelformat = pixfmt;
fmt.fmt.pix.field = V4L2_FIELD_ANY;
ret = xioctl(fd, VIDIOC_TRY_FMT, &fmt);
/*use the returned values*/
*width = fmt.fmt.pix.width;
*height = fmt.fmt.pix.height;
printf("{ ?GSPCA? : width = %u, height = %u }\n", *width, *height);
printf("fmtind:%i fsizeind: %i\n",fmtind,fsizeind);
if(listVidFormats[fmtind-1].listVidCap == NULL)
{
listVidFormats[fmtind-1].listVidCap = (VidCap*) realloc(
listVidFormats[fmtind-1].listVidCap,
sizeof(VidCap) * fsizeind);
/* listVidFormats[fmtind-1].listVidCap[0].framerate_num = NULL;
listVidFormats[fmtind-1].listVidCap[0].framerate_num = g_renew( int,
listVidFormats[fmtind-1].listVidCap[0].framerate_num,
1);
listVidFormats[fmtind-1].listVidCap[0].framerate_denom = NULL;
listVidFormats[fmtind-1].listVidCap[0].framerate_denom = g_renew( int,
listVidFormats[fmtind-1].listVidCap[0].framerate_denom,
1);*/
}
else
{
fprintf(stderr,"assert failed: listVidCap not Null\n");
return (-2);
}
listVidFormats[fmtind-1].listVidCap[0].width = *width;
listVidFormats[fmtind-1].listVidCap[0].height = *height;
listVidFormats[fmtind-1].listVidCap[0].framerate_num[0] = 1;
listVidFormats[fmtind-1].listVidCap[0].framerate_denom[0] = 25;
listVidFormats[fmtind-1].listVidCap[0].numb_frates = 1;
}
listVidFormats[fmtind-1].numb_res=fsizeind;
return 0;
}
