139 lines
4.0 KiB
C
139 lines
4.0 KiB
C
/* Linux driver for Philips webcam
|
|
Decompression frontend.
|
|
(C) 1999-2003 Nemosoft Unv.
|
|
(C) 2004-2006 Luc Saillard (luc@saillard.org)
|
|
|
|
NOTE: this version of pwc is an unofficial (modified) release of pwc & pcwx
|
|
driver and thus may have bugs that are not present in the original version.
|
|
Please send bug reports and support requests to <luc@saillard.org>.
|
|
The decompression routines have been implemented by reverse-engineering the
|
|
Nemosoft binary pwcx module. Caveat emptor.
|
|
|
|
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.
|
|
|
|
This program is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with this program; if not, write to the Free Software
|
|
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
|
|
vim: set ts=8:
|
|
*/
|
|
|
|
#include <asm/current.h>
|
|
#include <asm/types.h>
|
|
|
|
#include "pwc.h"
|
|
#include "pwc-uncompress.h"
|
|
#include "pwc-dec1.h"
|
|
#include "pwc-dec23.h"
|
|
|
|
int pwc_decompress(struct pwc_device *pdev)
|
|
{
|
|
struct pwc_frame_buf *fbuf;
|
|
int n, line, col, stride;
|
|
void *yuv, *image;
|
|
u16 *src;
|
|
u16 *dsty, *dstu, *dstv;
|
|
|
|
if (pdev == NULL)
|
|
return -EFAULT;
|
|
|
|
fbuf = pdev->read_frame;
|
|
if (fbuf == NULL)
|
|
return -EFAULT;
|
|
image = pdev->image_data;
|
|
image += pdev->images[pdev->fill_image].offset;
|
|
|
|
yuv = fbuf->data + pdev->frame_header_size; /* Skip header */
|
|
|
|
/* Raw format; that's easy... */
|
|
if (pdev->vpalette == VIDEO_PALETTE_RAW)
|
|
{
|
|
struct pwc_raw_frame *raw_frame = image;
|
|
raw_frame->type = cpu_to_le16(pdev->type);
|
|
raw_frame->vbandlength = cpu_to_le16(pdev->vbandlength);
|
|
/* cmd_buf is always 4 bytes, but sometimes, only the
|
|
* first 3 bytes is filled (Nala case). We can
|
|
* determine this using the type of the webcam */
|
|
memcpy(raw_frame->cmd, pdev->cmd_buf, 4);
|
|
memcpy(raw_frame+1, yuv, pdev->frame_size);
|
|
return 0;
|
|
}
|
|
|
|
if (pdev->vbandlength == 0) {
|
|
/* Uncompressed mode.
|
|
* We copy the data into the output buffer, using the viewport
|
|
* size (which may be larger than the image size).
|
|
* Unfortunately we have to do a bit of byte stuffing to get
|
|
* the desired output format/size.
|
|
*
|
|
* We do some byte shuffling here to go from the
|
|
* native format to YUV420P.
|
|
*/
|
|
src = (u16 *)yuv;
|
|
n = pdev->view.x * pdev->view.y;
|
|
|
|
/* offset in Y plane */
|
|
stride = pdev->view.x * pdev->offset.y + pdev->offset.x;
|
|
dsty = (u16 *)(image + stride);
|
|
|
|
/* offsets in U/V planes */
|
|
stride = pdev->view.x * pdev->offset.y / 4 + pdev->offset.x / 2;
|
|
dstu = (u16 *)(image + n + stride);
|
|
dstv = (u16 *)(image + n + n / 4 + stride);
|
|
|
|
/* increment after each line */
|
|
stride = (pdev->view.x - pdev->image.x) / 2; /* u16 is 2 bytes */
|
|
|
|
for (line = 0; line < pdev->image.y; line++) {
|
|
for (col = 0; col < pdev->image.x; col += 4) {
|
|
*dsty++ = *src++;
|
|
*dsty++ = *src++;
|
|
if (line & 1)
|
|
*dstv++ = *src++;
|
|
else
|
|
*dstu++ = *src++;
|
|
}
|
|
dsty += stride;
|
|
if (line & 1)
|
|
dstv += (stride >> 1);
|
|
else
|
|
dstu += (stride >> 1);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Compressed;
|
|
* the decompressor routines will write the data in planar format
|
|
* immediately.
|
|
*/
|
|
if (pdev->vsize == PSZ_VGA && pdev->vframes == 5 && pdev->vsnapshot) {
|
|
PWC_ERROR("Mode Bayer is not supported for now\n");
|
|
/* flags |= PWCX_FLAG_BAYER; */
|
|
return -ENXIO; /* No such device or address: missing decompressor */
|
|
}
|
|
|
|
if (DEVICE_USE_CODEC1(pdev->type)) {
|
|
|
|
/* TODO & FIXME */
|
|
PWC_ERROR("This chipset is not supported for now\n");
|
|
return -ENXIO; /* No such device or address: missing decompressor */
|
|
|
|
} else {
|
|
pwc_dec23_decompress(pdev, yuv, image, PWCX_FLAG_PLANAR);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
|
|
/* vim: set cino= formatoptions=croql cindent shiftwidth=8 tabstop=8: */
|