hollalinux
/
linux-sg2042
mirror of https://github.com/sophgo/linux-riscv.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

[media] V4L2: soc-camera: move generic functions into a separate file 

The sh_mobile_ceu_camera driver implements a generic algorithm for setting
up an optimal client and host scaling and cropping configuration. This
patch makes those functions available for all drivers.

Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Guennadi Liakhovetski 2013-04-25 08:18:45 -03:00 committed by Mauro Carvalho Chehab
parent eca430c83d
commit 22e0099ac9
5 changed files with 459 additions and 388 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
drivers/media/platform/soc_camera/Kconfig
View File

@ -8,6 +8,9 @@ config SOC_CAMERA
over a bus like PCI or USB. For example some i2c camera connected over a bus like PCI or USB. For example some i2c camera connected
directly to the data bus of an SoC. directly to the data bus of an SoC.
config SOC_CAMERA_SCALE_CROP
tristate
config SOC_CAMERA_PLATFORM config SOC_CAMERA_PLATFORM
tristate "platform camera support" tristate "platform camera support"
depends on SOC_CAMERA depends on SOC_CAMERA
@ -51,6 +54,7 @@ config VIDEO_SH_MOBILE_CEU
tristate "SuperH Mobile CEU Interface driver" tristate "SuperH Mobile CEU Interface driver"
depends on VIDEO_DEV && SOC_CAMERA && HAS_DMA && HAVE_CLK depends on VIDEO_DEV && SOC_CAMERA && HAS_DMA && HAVE_CLK
select VIDEOBUF2_DMA_CONTIG select VIDEOBUF2_DMA_CONTIG
select SOC_CAMERA_SCALE_CROP
---help--- ---help---
This is a v4l2 driver for the SuperH Mobile CEU Interface This is a v4l2 driver for the SuperH Mobile CEU Interface

4
drivers/media/platform/soc_camera/Makefile
View File

@ -1,4 +1,8 @@
obj-$(CONFIG_SOC_CAMERA) += soc_camera.o soc_mediabus.o obj-$(CONFIG_SOC_CAMERA) += soc_camera.o soc_mediabus.o
obj-$(CONFIG_SOC_CAMERA_SCALE_CROP) += soc_scale_crop.o
# a platform subdevice driver stub, allowing to support cameras by adding a
# couple of callback functions to the board code
obj-$(CONFIG_SOC_CAMERA_PLATFORM) += soc_camera_platform.o obj-$(CONFIG_SOC_CAMERA_PLATFORM) += soc_camera_platform.o
# soc-camera host drivers have to be linked after camera drivers # soc-camera host drivers have to be linked after camera drivers

391
drivers/media/platform/soc_camera/sh_mobile_ceu_camera.c
View File

@ -46,6 +46,8 @@
#include <media/v4l2-mediabus.h> #include <media/v4l2-mediabus.h>
#include <media/soc_mediabus.h> #include <media/soc_mediabus.h>
#include "soc_scale_crop.h"
/* register offsets for sh7722 / sh7723 */ /* register offsets for sh7722 / sh7723 */
#define CAPSR 0x00 /* Capture start register */ #define CAPSR 0x00 /* Capture start register */
@ -1005,8 +1007,6 @@ static bool sh_mobile_ceu_packing_supported(const struct soc_mbus_pixelfmt *fmt)
fmt->packing == SOC_MBUS_PACKING_EXTEND16); fmt->packing == SOC_MBUS_PACKING_EXTEND16);
} }
static int soc_camera_client_g_rect(struct v4l2_subdev *sd, struct v4l2_rect *rect);
static struct soc_camera_device *ctrl_to_icd(struct v4l2_ctrl *ctrl) static struct soc_camera_device *ctrl_to_icd(struct v4l2_ctrl *ctrl)
{ {
return container_of(ctrl->handler, struct soc_camera_device, return container_of(ctrl->handler, struct soc_camera_device,
@ -1194,344 +1194,8 @@ static void sh_mobile_ceu_put_formats(struct soc_camera_device *icd)
icd->host_priv = NULL; icd->host_priv = NULL;
} }
/* 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;
}
/* 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;
}
static unsigned int soc_camera_shift_scale(unsigned int size, unsigned int shift,
unsigned int scale)
{
return ((size << shift) + scale / 2) / scale;
}
static unsigned int soc_camera_calc_scale(unsigned int input, unsigned int shift,
unsigned int output)
{
return soc_camera_shift_scale(input, shift, output);
}
#define scale_down(size, scale) soc_camera_shift_scale(size, 12, scale) #define scale_down(size, scale) soc_camera_shift_scale(size, 12, scale)
#define calc_generic_scale(in, out) soc_camera_shift_scale(in, 12, out) #define calc_generic_scale(in, out) soc_camera_calc_scale(in, 12, out)
/* Get and store current client crop */
static int soc_camera_client_g_rect(struct v4l2_subdev *sd, struct v4l2_rect *rect)
{
struct v4l2_crop crop;
struct v4l2_cropcap cap;
int ret;
crop.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
ret = v4l2_subdev_call(sd, video, g_crop, &crop);
if (!ret) {
*rect = crop.c;
return ret;
}
/* Camera driver doesn't support .g_crop(), assume default rectangle */
cap.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
ret = v4l2_subdev_call(sd, video, cropcap, &cap);
if (!ret)
*rect = cap.defrect;
return ret;
}
/* 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;
}
/*
* 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
*/
static int soc_camera_client_s_crop(struct v4l2_subdev *sd,
struct v4l2_crop *crop, struct v4l2_crop *cam_crop,
struct v4l2_rect *target_rect, struct v4l2_rect *subrect)
{
struct v4l2_rect *rect = &crop->c, *cam_rect = &cam_crop->c;
struct device *dev = sd->v4l2_dev->dev;
struct v4l2_cropcap cap;
int ret;
unsigned int width, height;
v4l2_subdev_call(sd, video, s_crop, crop);
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_CROP failed, but camera rectangle matches */
dev_dbg(dev, "Camera S_CROP 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_CROP 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, video, cropcap, &cap);
if (ret < 0)
return ret;
/* Put user requested rectangle within sensor bounds */
soc_camera_limit_side(&rect->left, &rect->width, cap.bounds.left, 2,
cap.bounds.width);
soc_camera_limit_side(&rect->top, &rect->height, cap.bounds.top, 4,
cap.bounds.height);
/*
* Popular special case - some cameras can only handle fixed sizes like
* QVGA, VGA,... Take care to avoid infinite loop.
*/
width = max(cam_rect->width, 2);
height = max(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)) &&
(cap.bounds.width > width || cap.bounds.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 = cap.bounds.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 = cap.bounds.top;
if (cam_rect->top + cam_rect->height < rect->top + rect->height)
cam_rect->height = rect->top + rect->height -
cam_rect->top;
v4l2_subdev_call(sd, video, s_crop, cam_crop);
ret = soc_camera_client_g_rect(sd, cam_rect);
dev_geo(dev, "Camera S_CROP %d for %dx%d@%d:%d\n", ret,
cam_rect->width, cam_rect->height,
cam_rect->left, cam_rect->top);
}
/* S_CROP 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
*/
*cam_rect = cap.bounds;
v4l2_subdev_call(sd, video, s_crop, cam_crop);
ret = soc_camera_client_g_rect(sd, cam_rect);
dev_geo(dev, "Camera S_CROP %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;
}
/* 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 ceu_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. */
ceu_1to1 = true;
goto update_cache;
}
ceu_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 (ceu_1to1)
*subrect = *rect;
else
update_subrect(rect, subrect);
return 0;
}
/**
* @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
*/
static 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_mbus_framefmt mf_tmp = *mf;
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_s_fmt(icd, rect, subrect, *width, *height,
&mf_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 CEU 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;
}
/* /*
* CEU can scale and crop, but we don't want to waste bandwidth and kill the * CEU can scale and crop, but we don't want to waste bandwidth and kill the
@ -1689,55 +1353,6 @@ static int sh_mobile_ceu_get_crop(struct soc_camera_device *icd,
return 0; return 0;
} }
/*
* Calculate real client output window by applying new scales to the current
* client crop. New scales are calculated from the requested output format and
* CEU crop, mapped backed onto the client input (subrect).
*/
static 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
*/
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);
}
/* Similar to set_crop multistage iterative algorithm */ /* Similar to set_crop multistage iterative algorithm */
static int sh_mobile_ceu_set_fmt(struct soc_camera_device *icd, static int sh_mobile_ceu_set_fmt(struct soc_camera_device *icd,
struct v4l2_format *f) struct v4l2_format *f)

401
drivers/media/platform/soc_camera/soc_scale_crop.c Normal file
View File

@ -0,0 +1,401 @@
/*
* 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;
}
/* 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;
}
/* Get and store current client crop */
int soc_camera_client_g_rect(struct v4l2_subdev *sd, struct v4l2_rect *rect)
{
struct v4l2_crop crop;
struct v4l2_cropcap cap;
int ret;
crop.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
ret = v4l2_subdev_call(sd, video, g_crop, &crop);
if (!ret) {
*rect = crop.c;
return ret;
}
/* Camera driver doesn't support .g_crop(), assume default rectangle */
cap.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
ret = v4l2_subdev_call(sd, video, cropcap, &cap);
if (!ret)
*rect = cap.defrect;
return ret;
}
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;
}
/*
* 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_crop(struct v4l2_subdev *sd,
struct v4l2_crop *crop, struct v4l2_crop *cam_crop,
struct v4l2_rect *target_rect, struct v4l2_rect *subrect)
{
struct v4l2_rect *rect = &crop->c, *cam_rect = &cam_crop->c;
struct device *dev = sd->v4l2_dev->dev;
struct v4l2_cropcap cap;
int ret;
unsigned int width, height;
v4l2_subdev_call(sd, video, s_crop, crop);
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_CROP failed, but camera rectangle matches */
dev_dbg(dev, "Camera S_CROP 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_CROP 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, video, cropcap, &cap);
if (ret < 0)
return ret;
/* Put user requested rectangle within sensor bounds */
soc_camera_limit_side(&rect->left, &rect->width, cap.bounds.left, 2,
cap.bounds.width);
soc_camera_limit_side(&rect->top, &rect->height, cap.bounds.top, 4,
cap.bounds.height);
/*
* Popular special case - some cameras can only handle fixed sizes like
* QVGA, VGA,... Take care to avoid infinite loop.
*/
width = max(cam_rect->width, 2);
height = max(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)) &&
(cap.bounds.width > width || cap.bounds.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 = cap.bounds.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 = cap.bounds.top;
if (cam_rect->top + cam_rect->height < rect->top + rect->height)
cam_rect->height = rect->top + rect->height -
cam_rect->top;
v4l2_subdev_call(sd, video, s_crop, cam_crop);
ret = soc_camera_client_g_rect(sd, cam_rect);
dev_geo(dev, "Camera S_CROP %d for %dx%d@%d:%d\n", ret,
cam_rect->width, cam_rect->height,
cam_rect->left, cam_rect->top);
}
/* S_CROP 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
*/
*cam_rect = cap.bounds;
v4l2_subdev_call(sd, video, s_crop, cam_crop);
ret = soc_camera_client_g_rect(sd, cam_rect);
dev_geo(dev, "Camera S_CROP %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;
}
EXPORT_SYMBOL(soc_camera_client_s_crop);
/* 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 ceu_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. */
ceu_1to1 = true;
goto update_cache;
}
ceu_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 (ceu_1to1)
*subrect = *rect;
else
update_subrect(rect, subrect);
return 0;
}
/**
* @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_mbus_framefmt mf_tmp = *mf;
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_s_fmt(icd, rect, subrect, *width, *height,
&mf_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 CEU 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
* CEU 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
*/
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);

47
drivers/media/platform/soc_camera/soc_scale_crop.h Normal file
View File

@ -0,0 +1,47 @@
/*
* 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.
*/
#ifndef SOC_SCALE_CROP_H
#define SOC_SCALE_CROP_H
#include <linux/kernel.h>
struct soc_camera_device;
struct v4l2_crop;
struct v4l2_mbus_framefmt;
struct v4l2_pix_format;
struct v4l2_rect;
struct v4l2_subdev;
static inline unsigned int soc_camera_shift_scale(unsigned int size,
unsigned int shift, unsigned int scale)
{
return DIV_ROUND_CLOSEST(size << shift, scale);
}
#define soc_camera_calc_scale(in, shift, out) soc_camera_shift_scale(in, shift, out)
int soc_camera_client_g_rect(struct v4l2_subdev *sd, struct v4l2_rect *rect);
int soc_camera_client_s_crop(struct v4l2_subdev *sd,
struct v4l2_crop *crop, struct v4l2_crop *cam_crop,
struct v4l2_rect *target_rect, struct v4l2_rect *subrect);
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);
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);
#endif