Release 4.11 drivers/media/platform/soc_camera/soc_scale_crop.c
/*
* soc-camera generic scaling-cropping manipulation functions
*
* Copyright (C) 2013 Guennadi Liakhovetski <g.liakhovetski@gmx.de>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*/
#include <linux/device.h>
#include <linux/module.h>
#include <media/soc_camera.h>
#include <media/v4l2-common.h>
#include "soc_scale_crop.h"
#ifdef DEBUG_GEOMETRY
#define dev_geo dev_info
#else
#define dev_geo dev_dbg
#endif
/* Check if any dimension of r1 is smaller than respective one of r2 */
static bool is_smaller(const struct v4l2_rect *r1, const struct v4l2_rect *r2)
{
return r1->width < r2->width || r1->height < r2->height;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Guennadi Liakhovetski | 35 | 100.00% | 1 | 100.00% |
| Total | 35 | 100.00% | 1 | 100.00% |
/* Check if r1 fails to cover r2 */
static bool is_inside(const struct v4l2_rect *r1, const struct v4l2_rect *r2)
{
return r1->left > r2->left || r1->top > r2->top ||
r1->left + r1->width < r2->left + r2->width ||
r1->top + r1->height < r2->top + r2->height;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Guennadi Liakhovetski | 67 | 100.00% | 1 | 100.00% |
| Total | 67 | 100.00% | 1 | 100.00% |
/* Get and store current client crop */
int soc_camera_client_g_rect(struct v4l2_subdev *sd, struct v4l2_rect *rect)
{
struct v4l2_subdev_selection sdsel = {
.which = V4L2_SUBDEV_FORMAT_ACTIVE,
.target = V4L2_SEL_TGT_CROP,
};
int ret;
ret = v4l2_subdev_call(sd, pad, get_selection, NULL, &sdsel);
if (!ret) {
*rect = sdsel.r;
return ret;
}
sdsel.target = V4L2_SEL_TGT_CROP_DEFAULT;
ret = v4l2_subdev_call(sd, pad, get_selection, NULL, &sdsel);
if (!ret)
*rect = sdsel.r;
return ret;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Guennadi Liakhovetski | 73 | 70.19% | 1 | 50.00% |
| Hans Verkuil | 31 | 29.81% | 1 | 50.00% |
| Total | 104 | 100.00% | 2 | 100.00% |
EXPORT_SYMBOL(soc_camera_client_g_rect);
/* Client crop has changed, update our sub-rectangle to remain within the area */
static void update_subrect(struct v4l2_rect *rect, struct v4l2_rect *subrect)
{
if (rect->width < subrect->width)
subrect->width = rect->width;
if (rect->height < subrect->height)
subrect->height = rect->height;
if (rect->left > subrect->left)
subrect->left = rect->left;
else if (rect->left + rect->width >
subrect->left + subrect->width)
subrect->left = rect->left + rect->width -
subrect->width;
if (rect->top > subrect->top)
subrect->top = rect->top;
else if (rect->top + rect->height >
subrect->top + subrect->height)
subrect->top = rect->top + rect->height -
subrect->height;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Guennadi Liakhovetski | 158 | 100.00% | 1 | 100.00% |
| Total | 158 | 100.00% | 1 | 100.00% |
/*
* 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;
update_subrect(target_rect, subrect);
}
return ret;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Guennadi Liakhovetski | 547 | 79.16% | 1 | 33.33% |
| Hans Verkuil | 136 | 19.68% | 1 | 33.33% |
| Ricardo Ribalda Delgado | 8 | 1.16% | 1 | 33.33% |
| Total | 691 | 100.00% | 3 | 100.00% |
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
update_subrect(rect, subrect);
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Guennadi Liakhovetski | 369 | 88.07% | 2 | 50.00% |
| Hans Verkuil | 50 | 11.93% | 2 | 50.00% |
| Total | 419 | 100.00% | 4 | 100.00% |
/**
* @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;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Guennadi Liakhovetski | 205 | 86.86% | 2 | 66.67% |
| Hans Verkuil | 31 | 13.14% | 1 | 33.33% |
| Total | 236 | 100.00% | 3 | 100.00% |
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);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Guennadi Liakhovetski | 186 | 100.00% | 2 | 100.00% |
| Total | 186 | 100.00% | 2 | 100.00% |
EXPORT_SYMBOL(soc_camera_calc_client_output);
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Guennadi Liakhovetski | 1697 | 86.80% | 2 | 40.00% |
| Hans Verkuil | 250 | 12.79% | 2 | 40.00% |
| Ricardo Ribalda Delgado | 8 | 0.41% | 1 | 20.00% |
| Total | 1955 | 100.00% | 5 | 100.00% |
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