147 lines
4.0 KiB
C
147 lines
4.0 KiB
C
/* Linux driver for Philips webcam
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Decompression frontend.
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(C) 1999-2003 Nemosoft Unv.
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(C) 2004 Luc Saillard (luc@saillard.org)
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NOTE: this version of pwc is an unofficial (modified) release of pwc & pcwx
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driver and thus may have bugs that are not present in the original version.
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Please send bug reports and support requests to <luc@saillard.org>.
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The decompression routines have been implemented by reverse-engineering the
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Nemosoft binary pwcx module. Caveat emptor.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <asm/current.h>
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#include <asm/types.h>
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#include "pwc.h"
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#include "pwc-uncompress.h"
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int pwc_decompress(struct pwc_device *pdev)
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{
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struct pwc_frame_buf *fbuf;
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int n, line, col, stride;
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void *yuv, *image;
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u16 *src;
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u16 *dsty, *dstu, *dstv;
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if (pdev == NULL)
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return -EFAULT;
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#if defined(__KERNEL__) && defined(PWC_MAGIC)
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if (pdev->magic != PWC_MAGIC) {
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Err("pwc_decompress(): magic failed.\n");
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return -EFAULT;
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}
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#endif
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fbuf = pdev->read_frame;
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if (fbuf == NULL)
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return -EFAULT;
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image = pdev->image_ptr[pdev->fill_image];
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if (!image)
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return -EFAULT;
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yuv = fbuf->data + pdev->frame_header_size; /* Skip header */
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/* Raw format; that's easy... */
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if (pdev->vpalette == VIDEO_PALETTE_RAW)
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{
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memcpy(image, yuv, pdev->frame_size);
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return 0;
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}
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if (pdev->vbandlength == 0) {
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/* Uncompressed mode. We copy the data into the output buffer,
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using the viewport size (which may be larger than the image
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size). Unfortunately we have to do a bit of byte stuffing
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to get the desired output format/size.
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*/
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/*
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* We do some byte shuffling here to go from the
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* native format to YUV420P.
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*/
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src = (u16 *)yuv;
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n = pdev->view.x * pdev->view.y;
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/* offset in Y plane */
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stride = pdev->view.x * pdev->offset.y + pdev->offset.x;
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dsty = (u16 *)(image + stride);
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/* offsets in U/V planes */
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stride = pdev->view.x * pdev->offset.y / 4 + pdev->offset.x / 2;
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dstu = (u16 *)(image + n + stride);
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dstv = (u16 *)(image + n + n / 4 + stride);
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/* increment after each line */
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stride = (pdev->view.x - pdev->image.x) / 2; /* u16 is 2 bytes */
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for (line = 0; line < pdev->image.y; line++) {
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for (col = 0; col < pdev->image.x; col += 4) {
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*dsty++ = *src++;
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*dsty++ = *src++;
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if (line & 1)
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*dstv++ = *src++;
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else
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*dstu++ = *src++;
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}
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dsty += stride;
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if (line & 1)
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dstv += (stride >> 1);
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else
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dstu += (stride >> 1);
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}
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}
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else {
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/* Compressed; the decompressor routines will write the data
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in planar format immediately.
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*/
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int flags;
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flags = PWCX_FLAG_PLANAR;
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if (pdev->vsize == PSZ_VGA && pdev->vframes == 5 && pdev->vsnapshot)
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{
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printk(KERN_ERR "pwc: Mode Bayer is not supported for now\n");
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flags |= PWCX_FLAG_BAYER;
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return -ENXIO; /* No such device or address: missing decompressor */
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}
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#if 0
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switch (pdev->type)
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{
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case 675:
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case 680:
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case 690:
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case 720:
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case 730:
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case 740:
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case 750:
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pwc_dec23_decompress(&pdev->image, &pdev->view,
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&pdev->offset, yuv, image, flags,
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pdev->decompress_data, pdev->vbandlength);
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break;
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case 645:
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case 646:
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/* TODO & FIXME */
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return -ENXIO; /* Missing decompressor */
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break;
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}
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#endif
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}
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return 0;
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}
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