/*
* The common for both scaling and cropping iterative approach is:
* 1. try if the client can produce exactly what requested by the user
* 2. if (1) failed, try to double the client image until we get one big enough
* 3. if (2) failed, try to request the maximum image
*/
int soc_camera_client_s_selection(struct v4l2_subdev *sd,
struct v4l2_selection *sel, struct v4l2_selection *cam_sel,
struct v4l2_rect *target_rect, struct v4l2_rect *subrect)
{
struct v4l2_subdev_selection sdsel = {
.which = V4L2_SUBDEV_FORMAT_ACTIVE,
.target = sel->target,
.flags = sel->flags,
.r = sel->r,
};
struct v4l2_subdev_selection bounds = {
.which = V4L2_SUBDEV_FORMAT_ACTIVE,
.target = V4L2_SEL_TGT_CROP_BOUNDS,
};
struct v4l2_rect *rect = &sel->r, *cam_rect = &cam_sel->r;
struct device *dev = sd->v4l2_dev->dev;
int ret;
unsigned int width, height;
v4l2_subdev_call(sd, pad, set_selection, NULL, &sdsel);
sel->r = sdsel.r;
ret = soc_camera_client_g_rect(sd, cam_rect);
if (ret < 0)
return ret;
/*
* Now cam_crop contains the current camera input rectangle, and it must
* be within camera cropcap bounds
*/
if (!memcmp(rect, cam_rect, sizeof(*rect))) {
/* Even if camera S_SELECTION failed, but camera rectangle matches */
dev_dbg(dev, "Camera S_SELECTION successful for %dx%d@%d:%d\n",
rect->width, rect->height, rect->left, rect->top);
*target_rect = *cam_rect;
return 0;
}
/* Try to fix cropping, that camera hasn't managed to set */
dev_geo(dev, "Fix camera S_SELECTION for %dx%d@%d:%d to %dx%d@%d:%d\n",
cam_rect->width, cam_rect->height,
cam_rect->left, cam_rect->top,
rect->width, rect->height, rect->left, rect->top);
/* We need sensor maximum rectangle */
ret = v4l2_subdev_call(sd, pad, get_selection, NULL, &bounds);
if (ret < 0)
return ret;
/* Put user requested rectangle within sensor bounds */
soc_camera_limit_side(&rect->left, &rect->width, sdsel.r.left, 2,
bounds.r.width);
soc_camera_limit_side(&rect->top, &rect->height, sdsel.r.top, 4,
bounds.r.height);
/*
* Popular special case - some cameras can only handle fixed sizes like
* QVGA, VGA,... Take care to avoid infinite loop.
*/
width = max_t(unsigned int, cam_rect->width, 2);
height = max_t(unsigned int, cam_rect->height, 2);
/*
* Loop as long as sensor is not covering the requested rectangle and
* is still within its bounds
*/
while (!ret && (is_smaller(cam_rect, rect) ||
is_inside(cam_rect, rect)) &&
(bounds.r.width > width || bounds.r.height > height)) {
width *= 2;
height *= 2;
cam_rect->width = width;
cam_rect->height = height;
/*
* We do not know what capabilities the camera has to set up
* left and top borders. We could try to be smarter in iterating
* them, e.g., if camera current left is to the right of the
* target left, set it to the middle point between the current
* left and minimum left. But that would add too much
* complexity: we would have to iterate each border separately.
* Instead we just drop to the left and top bounds.
*/
if (cam_rect->left > rect->left)
cam_rect->left = bounds.r.left;
if (cam_rect->left + cam_rect->width < rect->left + rect->width)
cam_rect->width = rect->left + rect->width -
cam_rect->left;
if (cam_rect->top > rect->top)
cam_rect->top = bounds.r.top;
if (cam_rect->top + cam_rect->height < rect->top + rect->height)
cam_rect->height = rect->top + rect->height -
cam_rect->top;
sdsel.r = *cam_rect;
v4l2_subdev_call(sd, pad, set_selection, NULL, &sdsel);
*cam_rect = sdsel.r;
ret = soc_camera_client_g_rect(sd, cam_rect);
dev_geo(dev, "Camera S_SELECTION %d for %dx%d@%d:%d\n", ret,
cam_rect->width, cam_rect->height,
cam_rect->left, cam_rect->top);
}
/* S_SELECTION must not modify the rectangle */
if (is_smaller(cam_rect, rect) || is_inside(cam_rect, rect)) {
/*
* The camera failed to configure a suitable cropping,
* we cannot use the current rectangle, set to max
*/
sdsel.r = bounds.r;
v4l2_subdev_call(sd, pad, set_selection, NULL, &sdsel);
*cam_rect = sdsel.r;
ret = soc_camera_client_g_rect(sd, cam_rect);
dev_geo(dev, "Camera S_SELECTION %d for max %dx%d@%d:%d\n", ret,
cam_rect->width, cam_rect->height,
cam_rect->left, cam_rect->top);
}
if (!ret) {
*target_rect = *cam_rect;
move_and_crop_subrect(target_rect, subrect);
}
return ret;
}
EXPORT_SYMBOL(soc_camera_client_s_selection);
/* Iterative set_fmt, also updates cached client crop on success */
static int client_set_fmt(struct soc_camera_device *icd,
struct v4l2_rect *rect, struct v4l2_rect *subrect,
unsigned int max_width, unsigned int max_height,
struct v4l2_subdev_format *format, bool host_can_scale)
{
struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
struct device *dev = icd->parent;
struct v4l2_mbus_framefmt *mf = &format->format;
unsigned int width = mf->width, height = mf->height, tmp_w, tmp_h;
struct v4l2_subdev_selection sdsel = {
.which = V4L2_SUBDEV_FORMAT_ACTIVE,
.target = V4L2_SEL_TGT_CROP_BOUNDS,
};
bool host_1to1;
int ret;
ret = v4l2_device_call_until_err(sd->v4l2_dev,
soc_camera_grp_id(icd), pad,
set_fmt, NULL, format);
if (ret < 0)
return ret;
dev_geo(dev, "camera scaled to %ux%u\n", mf->width, mf->height);
if (width == mf->width && height == mf->height) {
/* Perfect! The client has done it all. */
host_1to1 = true;
goto update_cache;
}
host_1to1 = false;
if (!host_can_scale)
goto update_cache;
ret = v4l2_subdev_call(sd, pad, get_selection, NULL, &sdsel);
if (ret < 0)
return ret;
if (max_width > sdsel.r.width)
max_width = sdsel.r.width;
if (max_height > sdsel.r.height)
max_height = sdsel.r.height;
/* Camera set a format, but geometry is not precise, try to improve */
tmp_w = mf->width;
tmp_h = mf->height;
/* width <= max_width && height <= max_height - guaranteed by try_fmt */
while ((width > tmp_w || height > tmp_h) &&
tmp_w < max_width && tmp_h < max_height) {
tmp_w = min(2 * tmp_w, max_width);
tmp_h = min(2 * tmp_h, max_height);
mf->width = tmp_w;
mf->height = tmp_h;
ret = v4l2_device_call_until_err(sd->v4l2_dev,
soc_camera_grp_id(icd), pad,
set_fmt, NULL, format);
dev_geo(dev, "Camera scaled to %ux%u\n",
mf->width, mf->height);
if (ret < 0) {
/* This shouldn't happen */
dev_err(dev, "Client failed to set format: %d\n", ret);
return ret;
}
}
update_cache:
/* Update cache */
ret = soc_camera_client_g_rect(sd, rect);
if (ret < 0)
return ret;
if (host_1to1)
*subrect = *rect;
else
move_and_crop_subrect(rect, subrect);
return 0;
}
/**
* soc_camera_client_scale
* @icd: soc-camera device
* @rect: camera cropping window
* @subrect: part of rect, sent to the user
* @mf: in- / output camera output window
* @width: on input: max host input width;
* on output: user width, mapped back to input
* @height: on input: max host input height;
* on output: user height, mapped back to input
* @host_can_scale: host can scale this pixel format
* @shift: shift, used for scaling
*/
int soc_camera_client_scale(struct soc_camera_device *icd,
struct v4l2_rect *rect, struct v4l2_rect *subrect,
struct v4l2_mbus_framefmt *mf,
unsigned int *width, unsigned int *height,
bool host_can_scale, unsigned int shift)
{
struct device *dev = icd->parent;
struct v4l2_subdev_format fmt_tmp = {
.which = V4L2_SUBDEV_FORMAT_ACTIVE,
.format = *mf,
};
struct v4l2_mbus_framefmt *mf_tmp = &fmt_tmp.format;
unsigned int scale_h, scale_v;
int ret;
/*
* 5. Apply iterative camera S_FMT for camera user window (also updates
* client crop cache and the imaginary sub-rectangle).
*/
ret = client_set_fmt(icd, rect, subrect, *width, *height,
&fmt_tmp, host_can_scale);
if (ret < 0)
return ret;
dev_geo(dev, "5: camera scaled to %ux%u\n",
mf_tmp->width, mf_tmp->height);
/* 6. Retrieve camera output window (g_fmt) */
/* unneeded - it is already in "mf_tmp" */
/* 7. Calculate new client scales. */
scale_h = soc_camera_calc_scale(rect->width, shift, mf_tmp->width);
scale_v = soc_camera_calc_scale(rect->height, shift, mf_tmp->height);
mf->width = mf_tmp->width;
mf->height = mf_tmp->height;
mf->colorspace = mf_tmp->colorspace;
/*
* 8. Calculate new host crop - apply camera scales to previously
* updated "effective" crop.
*/
*width = soc_camera_shift_scale(subrect->width, shift, scale_h);
*height = soc_camera_shift_scale(subrect->height, shift, scale_v);
dev_geo(dev, "8: new client sub-window %ux%u\n", *width, *height);
return 0;
}
EXPORT_SYMBOL(soc_camera_client_scale);
/*
* Calculate real client output window by applying new scales to the current
* client crop. New scales are calculated from the requested output format and
* host crop, mapped backed onto the client input (subrect).
*/
void soc_camera_calc_client_output(struct soc_camera_device *icd,
struct v4l2_rect *rect, struct v4l2_rect *subrect,
const struct v4l2_pix_format *pix, struct v4l2_mbus_framefmt *mf,
unsigned int shift)
{
struct device *dev = icd->parent;
unsigned int scale_v, scale_h;
if (subrect->width == rect->width &&
subrect->height == rect->height) {
/* No sub-cropping */
mf->width = pix->width;
mf->height = pix->height;
return;
}
/* 1.-2. Current camera scales and subwin - cached. */
dev_geo(dev, "2: subwin %ux%u@%u:%u\n",
subrect->width, subrect->height,
subrect->left, subrect->top);
/*
* 3. Calculate new combined scales from input sub-window to requested
* user window.
*/
/*
* TODO: CEU cannot scale images larger than VGA to smaller than SubQCIF
* (128x96) or larger than VGA. This and similar limitations have to be
* taken into account here.
*/
scale_h = soc_camera_calc_scale(subrect->width, shift, pix->width);
scale_v = soc_camera_calc_scale(subrect->height, shift, pix->height);
dev_geo(dev, "3: scales %u:%u\n", scale_h, scale_v);
/*
* 4. Calculate desired client output window by applying combined scales
* to client (real) input window.
*/
mf->width = soc_camera_shift_scale(rect->width, shift, scale_h);
mf->height = soc_camera_shift_scale(rect->height, shift, scale_v);
}
EXPORT_SYMBOL(soc_camera_calc_client_output);
MODULE_DESCRIPTION("soc-camera scaling-cropping functions");
MODULE_AUTHOR("Guennadi Liakhovetski <*****@*****.**>");
MODULE_LICENSE("GPL");
/* Iterative s_mbus_fmt, also updates cached client crop on success */
static int client_s_fmt(struct soc_camera_device *icd,
struct v4l2_rect *rect, struct v4l2_rect *subrect,
unsigned int max_width, unsigned int max_height,
struct v4l2_mbus_framefmt *mf, bool host_can_scale)
{
struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
struct device *dev = icd->parent;
unsigned int width = mf->width, height = mf->height, tmp_w, tmp_h;
struct v4l2_cropcap cap;
bool host_1to1;
int ret;
ret = v4l2_device_call_until_err(sd->v4l2_dev,
soc_camera_grp_id(icd), video,
s_mbus_fmt, mf);
if (ret < 0)
return ret;
dev_geo(dev, "camera scaled to %ux%u\n", mf->width, mf->height);
if (width == mf->width && height == mf->height) {
/* Perfect! The client has done it all. */
host_1to1 = true;
goto update_cache;
}
host_1to1 = false;
if (!host_can_scale)
goto update_cache;
cap.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
ret = v4l2_subdev_call(sd, video, cropcap, &cap);
if (ret < 0)
return ret;
if (max_width > cap.bounds.width)
max_width = cap.bounds.width;
if (max_height > cap.bounds.height)
max_height = cap.bounds.height;
/* Camera set a format, but geometry is not precise, try to improve */
tmp_w = mf->width;
tmp_h = mf->height;
/* width <= max_width && height <= max_height - guaranteed by try_fmt */
while ((width > tmp_w || height > tmp_h) &&
tmp_w < max_width && tmp_h < max_height) {
tmp_w = min(2 * tmp_w, max_width);
tmp_h = min(2 * tmp_h, max_height);
mf->width = tmp_w;
mf->height = tmp_h;
ret = v4l2_device_call_until_err(sd->v4l2_dev,
soc_camera_grp_id(icd), video,
s_mbus_fmt, mf);
dev_geo(dev, "Camera scaled to %ux%u\n",
mf->width, mf->height);
if (ret < 0) {
/* This shouldn't happen */
dev_err(dev, "Client failed to set format: %d\n", ret);
return ret;
}
}
update_cache:
/* Update cache */
ret = soc_camera_client_g_rect(sd, rect);
if (ret < 0)
return ret;
if (host_1to1)
*subrect = *rect;
else
update_subrect(rect, subrect);
return 0;
}