- 根目录:
- drivers
- media
- video
- omap
- omap_voutlib.c
/*
* omap_voutlib.c
*
* Copyright (C) 2005-2010 Texas Instruments.
*
* This file is licensed under the terms of the GNU General Public License
* version 2. This program is licensed "as is" without any warranty of any
* kind, whether express or implied.
*
* Based on the OMAP2 camera driver
* Video-for-Linux (Version 2) camera capture driver for
* the OMAP24xx camera controller.
*
* Author: Andy Lowe (source@mvista.com)
*
* Copyright (C) 2004 MontaVista Software, Inc.
* Copyright (C) 2010 Texas Instruments.
*
*/
#include <linux/module.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/videodev2.h>
#include <linux/dma-mapping.h>
#include <plat/cpu.h>
#include "omap_voutlib.h"
MODULE_AUTHOR("Texas Instruments");
MODULE_DESCRIPTION("OMAP Video library");
MODULE_LICENSE("GPL");
/* Return the default overlay cropping rectangle in crop given the image
* size in pix and the video display size in fbuf. The default
* cropping rectangle is the largest rectangle no larger than the capture size
* that will fit on the display. The default cropping rectangle is centered in
* the image. All dimensions and offsets are rounded down to even numbers.
*/
void omap_vout_default_crop(struct v4l2_pix_format *pix,
struct v4l2_framebuffer *fbuf, struct v4l2_rect *crop)
{
crop->width = (pix->width < fbuf->fmt.width) ?
pix->width : fbuf->fmt.width;
crop->height = (pix->height < fbuf->fmt.height) ?
pix->height : fbuf->fmt.height;
crop->width &= ~1;
crop->height &= ~1;
crop->left = ((pix->width - crop->width) >> 1) & ~1;
crop->top = ((pix->height - crop->height) >> 1) & ~1;
}
EXPORT_SYMBOL_GPL(omap_vout_default_crop);
/* Given a new render window in new_win, adjust the window to the
* nearest supported configuration. The adjusted window parameters are
* returned in new_win.
* Returns zero if successful, or -EINVAL if the requested window is
* impossible and cannot reasonably be adjusted.
*/
int omap_vout_try_window(struct v4l2_framebuffer *fbuf,
struct v4l2_window *new_win)
{
struct v4l2_rect try_win;
/* make a working copy of the new_win rectangle */
try_win = new_win->w;
/* adjust the preview window so it fits on the display by clipping any
* offscreen areas
*/
if (try_win.left < 0) {
try_win.width += try_win.left;
try_win.left = 0;
}
if (try_win.top < 0) {
try_win.height += try_win.top;
try_win.top = 0;
}
try_win.width = (try_win.width < fbuf->fmt.width) ?
try_win.width : fbuf->fmt.width;
try_win.height = (try_win.height < fbuf->fmt.height) ?
try_win.height : fbuf->fmt.height;
if (try_win.left + try_win.width > fbuf->fmt.width)
try_win.width = fbuf->fmt.width - try_win.left;
if (try_win.top + try_win.height > fbuf->fmt.height)
try_win.height = fbuf->fmt.height - try_win.top;
try_win.width &= ~1;
try_win.height &= ~1;
if (try_win.width <= 0 || try_win.height <= 0)
return -EINVAL;
/* We now have a valid preview window, so go with it */
new_win->w = try_win;
new_win->field = V4L2_FIELD_ANY;
return 0;
}
EXPORT_SYMBOL_GPL(omap_vout_try_window);
/* Given a new render window in new_win, adjust the window to the
* nearest supported configuration. The image cropping window in crop
* will also be adjusted if necessary. Preference is given to keeping the
* the window as close to the requested configuration as possible. If
* successful, new_win, vout->win, and crop are updated.
* Returns zero if successful, or -EINVAL if the requested preview window is
* impossible and cannot reasonably be adjusted.
*/
int omap_vout_new_window(struct v4l2_rect *crop,
struct v4l2_window *win, struct v4l2_framebuffer *fbuf,
struct v4l2_window *new_win)
{
int err;
err = omap_vout_try_window(fbuf, new_win);
if (err)
return err;
/* update our preview window */
win->w = new_win->w;
win->field = new_win->field;
win->chromakey = new_win->chromakey;
/* Adjust the cropping window to allow for resizing limitation */
if (cpu_is_omap24xx()) {
/* For 24xx limit is 8x to 1/2x scaling. */
if ((crop->height/win->w.height) >= 2)
crop->height = win->w.height * 2;
if ((crop->width/win->w.width) >= 2)
crop->width = win->w.width * 2;
if (crop->width > 768) {
/* The OMAP2420 vertical resizing line buffer is 768
* pixels wide. If the cropped image is wider than
* 768 pixels then it cannot be vertically resized.
*/
if (crop->height != win->w.height)
crop->width = 768;
}
} else if (cpu_is_omap34xx()) {
/* For 34xx limit is 8x to 1/4x scaling. */
if ((crop->height/win->w.height) >= 4)
crop->height = win->w.height * 4;
if ((crop->width/win->w.width) >= 4)
crop->width = win->w.width * 4;
}
return 0;
}
EXPORT_SYMBOL_GPL(omap_vout_new_window);
/* Given a new cropping rectangle in new_crop, adjust the cropping rectangle to
* the nearest supported configuration. The image render window in win will
* also be adjusted if necessary. The preview window is adjusted such that the
* horizontal and vertical rescaling ratios stay constant. If the render
* window would fall outside the display boundaries, the cropping rectangle
* will also be adjusted to maintain the rescaling ratios. If successful, crop
* and win are updated.
* Returns zero if successful, or -EINVAL if the requested cropping rectangle is
* impossible and cannot reasonably be adjusted.
*/
int omap_vout_new_crop(struct v4l2_pix_format *pix,
struct v4l2_rect *crop, struct v4l2_window *win,
struct v4l2_framebuffer *fbuf, const struct v4l2_rect *new_crop)
{
struct v4l2_rect try_crop;
unsigned long vresize, hresize;
/* make a working copy of the new_crop rectangle */
try_crop = *new_crop;
/* adjust the cropping rectangle so it fits in the image */
if (try_crop.left < 0) {
try_crop.width += try_crop.left;
try_crop.left = 0;
}
if (try_crop.top < 0) {
try_crop.height += try_crop.top;
try_crop.top = 0;
}
try_crop.width = (try_crop.width < pix->width) ?
try_crop.width : pix->width;
try_crop.height = (try_crop.height < pix->height) ?
try_crop.height : pix->height;
if (try_crop.left + try_crop.width > pix->width)
try_crop.width = pix->width - try_crop.left;
if (try_crop.top + try_crop.height > pix->height)
try_crop.height = pix->height - try_crop.top;
try_crop.width &= ~1;
try_crop.height &= ~1;
if (try_crop.width <= 0 || try_crop.height <= 0)
return -EINVAL;
if (cpu_is_omap24xx()) {
if (try_crop.height != win->w.height) {
/* If we're resizing vertically, we can't support a
* crop width wider than 768 pixels.
*/
if (try_crop.width > 768)
try_crop.width = 768;
}
}
/* vertical resizing */
vresize = (1024 * try_crop.height) / win->w.height;
if (cpu_is_omap24xx() && (vresize > 2048))
vresize = 2048;
else if (cpu_is_omap34xx() && (vresize > 4096))
vresize = 4096;
win->w.height = ((1024 * try_crop.height) / vresize) & ~1;
if (win->w.height == 0)
win->w.height = 2;
if (win->w.height + win->w.top > fbuf->fmt.height) {
/* We made the preview window extend below the bottom of the
* display, so clip it to the display boundary and resize the
* cropping height to maintain the vertical resizing ratio.
*/
win->w.height = (fbuf->fmt.height - win->w.top) & ~1;
if (try_crop.height == 0)
try_crop.height = 2;
}
/* horizontal resizing */
hresize = (1024 * try_crop.width) / win->w.width;
if (cpu_is_omap24xx() && (hresize > 2048))
hresize = 2048;
else if (cpu_is_omap34xx() && (hresize > 4096))
hresize = 4096;
win->w.width = ((1024 * try_crop.width) / hresize) & ~1;
if (win->w.width == 0)
win->w.width = 2;
if (win->w.width + win->w.left > fbuf->fmt.width) {
/* We made the preview window extend past the right side of the
* display, so clip it to the display boundary and resize the
* cropping width to maintain the horizontal resizing ratio.
*/
win->w.width = (fbuf->fmt.width - win->w.left) & ~1;
if (try_crop.width == 0)
try_crop.width = 2;
}
if (cpu_is_omap24xx()) {
if ((try_crop.height/win->w.height) >= 2)
try_crop.height = win->w.height * 2;
if ((try_crop.width/win->w.width) >= 2)
try_crop.width = win->w.width * 2;
if (try_crop.width > 768) {
/* The OMAP2420 vertical resizing line buffer is
* 768 pixels wide. If the cropped image is wider
* than 768 pixels then it cannot be vertically resized.
*/
if (try_crop.height != win->w.height)
try_crop.width = 768;
}
} else if (cpu_is_omap34xx()) {
if ((try_crop.height/win->w.height) >= 4)
try_crop.height = win->w.height * 4;
if ((try_crop.width/win->w.width) >= 4)
try_crop.width = win->w.width * 4;
}
/* update our cropping rectangle and we're done */
*crop = try_crop;
return 0;
}
EXPORT_SYMBOL_GPL(omap_vout_new_crop);
/* Given a new format in pix and fbuf, crop and win
* structures are initialized to default values. crop
* is initialized to the largest window size that will fit on the display. The
* crop window is centered in the image. win is initialized to
* the same size as crop and is centered on the display.
* All sizes and offsets are constrained to be even numbers.
*/
void omap_vout_new_format(struct v4l2_pix_format *pix,
struct v4l2_framebuffer *fbuf, struct v4l2_rect *crop,
struct v4l2_window *win)
{
/* crop defines the preview source window in the image capture
* buffer
*/
omap_vout_default_crop(pix, fbuf, crop);
/* win defines the preview target window on the display */
win->w.width = crop->width;
win->w.height = crop->height;
win->w.left = ((fbuf->fmt.width - win->w.width) >> 1) & ~1;
win->w.top = ((fbuf->fmt.height - win->w.height) >> 1) & ~1;
}
EXPORT_SYMBOL_GPL(omap_vout_new_format);
/*
* Allocate buffers
*/
unsigned long omap_vout_alloc_buffer(u32 buf_size, u32 *phys_addr)
{
u32 order, size;
unsigned long virt_addr, addr;
size = PAGE_ALIGN(buf_size);
order = get_order(size);
virt_addr = __get_free_pages(GFP_KERNEL, order);
addr = virt_addr;
if (virt_addr) {
while (size > 0) {
SetPageReserved(virt_to_page(addr));
addr += PAGE_SIZE;
size -= PAGE_SIZE;
}
}
*phys_addr = (u32) virt_to_phys((void *) virt_addr);
return virt_addr;
}
/*
* Free buffers
*/
void omap_vout_free_buffer(unsigned long virtaddr, u32 buf_size)
{
u32 order, size;
unsigned long addr = virtaddr;
size = PAGE_ALIGN(buf_size);
order = get_order(size);
while (size > 0) {
ClearPageReserved(virt_to_page(addr));
addr += PAGE_SIZE;
size -= PAGE_SIZE;
}
free_pages((unsigned long) virtaddr, order);
}