/* It should set the capture resolution
Cheated from the openCV cap_libv4l.cpp the method is the following:
Turn off the stream (video_disable)
Unmap buffers
Close the filedescriptor
Initialize the camera again with the new resolution
*/
int setResolution(struct vdIn *vd, int width, int height)
{
int ret;
DBG("setResolution(%d, %d)\n", width, height);
vd->streamingState = STREAMING_PAUSED;
if(video_disable(vd, STREAMING_PAUSED) == 0) { // do streamoff
DBG("Unmap buffers\n");
int i;
for(i = 0; i < NB_BUFFER; i++)
munmap(vd->mem[i], vd->buf.length);
if(CLOSE_VIDEO(vd->fd) == 0) {
DBG("Device closed successfully\n");
}
vd->width = width;
vd->height = height;
if(init_v4l2(vd) < 0) {
fprintf(stderr, " Init v4L2 failed !! exit fatal \n");
return -1;
} else {
DBG("reinit done\n");
video_enable(vd);
return 0;
}
} else {
DBG("Unable to disable streaming\n");
return -1;
}
return ret;
}
int CameraManager2::close_v4l2() {
int i;
if (vd->isstreaming)
video_disable();
/* If the memory maps are not released the device will remain opened even
after a call to close(); */
for (i = 0; i < NB_BUFFER; i++) {
munmap (vd->mem[i], vd->buf.length);
}
if (vd->tmpbuffer)
free (vd->tmpbuffer);
vd->tmpbuffer = NULL;
free (vd->framebuffer);
vd->framebuffer = NULL;
free (vd->videodevice);
free (vd->status);
free (vd->pictName);
vd->videodevice = NULL;
vd->status = NULL;
vd->pictName = NULL;
close (vd->fd);
return 0;
}
void destroy_video_device(struct video_device *vd) {
if (vd->streaming_state == STREAMING_ON) {
video_disable(vd, STREAMING_OFF);
}
if (CLOSE_VIDEO(vd->fd) != 0) {
log_itf(LOG_ERROR, "Failed to close device %s.", vd->device_filename);
}
free(vd->framebuffer);
vd->framebuffer = NULL;
free(vd->device_filename);
vd->device_filename = NULL;
free(vd->formats);
vd->formats = NULL;
vd->format_count = 0;
free(vd->resolutions);
vd->resolutions = NULL;
vd->resolution_count = 0;
free(vd);
}
int setResolution(struct vdIn *vd, int width, int height)
{
int ret;
DBG("setResolution(%d, %d)\n", width, height);
vd->streamingState = STREAMING_PAUSED;
if (video_disable(vd, STREAMING_PAUSED) == 0) {
ret = IOCTL_VIDEO(vd->fd, VIDIOC_G_FMT, &vd->fmt);
if (ret != 0) {
DBG("Unable to get current format\n");
return ret;
} else {
DBG("Current size: %d, %d)\n", vd->fmt.fmt.pix.width, vd->fmt.fmt.pix.height);
}
vd->fmt.fmt.pix.width = width;
vd->fmt.fmt.pix.height = height;
ret = IOCTL_VIDEO(vd->fd, VIDIOC_S_FMT, &vd->fmt);
if (ret != 0) {
DBG("Unable to set the new format code: %d errno: %d\n", ret, errno);
if (errno == EBUSY)
DBG("EBUSY: IO is in progress\n");
} else {
DBG("New resolution is successfully applied\n");
}
if (video_enable(vd) == 0) {
DBG("Streaming on again\n");
memset(&vd->rb, 0, sizeof(struct v4l2_requestbuffers));
vd->rb.count = NB_BUFFER;
vd->rb.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
vd->rb.memory = V4L2_MEMORY_MMAP;
ret = IOCTL_VIDEO(vd->fd, VIDIOC_REQBUFS, &vd->rb);
if (ret < 0) {
perror("Unable to reallocate buffers");
}
} else {
DBG("Unable to reenable streaming\n");
return -1;
}
} else {
DBG("Unable to disable streaming\n");
return -1;
}
return ret;
}
void close_v4l2(struct vdIn *vd)
{
if (vd->isstreaming)
video_disable(vd);
if (vd->tmpbuffer)
free(vd->tmpbuffer);
vd->tmpbuffer = NULL;
free(vd->framebuffer);
vd->framebuffer = NULL;
free(vd->videodevice);
free(vd->status);
free(vd->pictName);
vd->videodevice = NULL;
vd->status = NULL;
vd->pictName = NULL;
}
int close_v4l2(struct vdIn *vd)
{
if(vd->streamingState == STREAMING_ON)
video_disable(vd, STREAMING_OFF);
if(vd->tmpbuffer)
free(vd->tmpbuffer);
vd->tmpbuffer = NULL;
free(vd->framebuffer);
vd->framebuffer = NULL;
free(vd->videodevice);
free(vd->status);
free(vd->pictName);
vd->videodevice = NULL;
vd->status = NULL;
vd->pictName = NULL;
return 0;
}