2b455db6d4
Add v4l2 compatibility Include the decompressor (legal problem has been resolv by Alan Cox) Faster decoder and easier to maintain, optimize, ... Can export to userland compressed stream Support more cameras, lot of bugs are fixed. Signed-off-by: Luc Saillard <luc@saillard.org> Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
138 lines
4 KiB
C
138 lines
4 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) 2004-2006 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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vim: set ts=8:
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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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#include "pwc-dec1.h"
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#include "pwc-dec23.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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fbuf = pdev->read_frame;
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if (fbuf == NULL)
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return -EFAULT;
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image = pdev->image_data;
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image += pdev->images[pdev->fill_image].offset;
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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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struct pwc_raw_frame *raw_frame = image;
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raw_frame->type = cpu_to_le16(pdev->type);
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raw_frame->vbandlength = cpu_to_le16(pdev->vbandlength);
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/* cmd_buf is always 4 bytes, but sometimes, only the
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* first 3 bytes is filled (Nala case). We can
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* determine this using the type of the webcam */
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memcpy(raw_frame->cmd, pdev->cmd_buf, 4);
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memcpy(raw_frame+1, 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.
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* We copy the data into the output buffer, using the viewport
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* size (which may be larger than the image size).
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* Unfortunately we have to do a bit of byte stuffing to get
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* the desired output format/size.
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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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return 0;
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}
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/*
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* Compressed;
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* the decompressor routines will write the data in planar format
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* immediately.
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*/
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if (pdev->vsize == PSZ_VGA && pdev->vframes == 5 && pdev->vsnapshot) {
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PWC_ERROR("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 (DEVICE_USE_CODEC1(pdev->type)) {
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/* TODO & FIXME */
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PWC_ERROR("This chipset is not supported for now\n");
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return -ENXIO; /* No such device or address: missing decompressor */
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} else {
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pwc_dec23_decompress(pdev, yuv, image, PWCX_FLAG_PLANAR);
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}
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return 0;
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}
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/* vim: set cino= formatoptions=croql cindent shiftwidth=8 tabstop=8: */
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