diff options
Diffstat (limited to 'drivers/media/usb/pwc/pwc-uncompress.c')
| -rw-r--r-- | drivers/media/usb/pwc/pwc-uncompress.c | 107 |
1 files changed, 107 insertions, 0 deletions
diff --git a/drivers/media/usb/pwc/pwc-uncompress.c b/drivers/media/usb/pwc/pwc-uncompress.c new file mode 100644 index 0000000..b65903f --- /dev/null +++ b/drivers/media/usb/pwc/pwc-uncompress.c @@ -0,0 +1,107 @@ +/* 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-dec1.h" +#include "pwc-dec23.h" + +int pwc_decompress(struct pwc_device *pdev, struct pwc_frame_buf *fbuf) +{ + int n, line, col; + void *yuv, *image; + u16 *src; + u16 *dsty, *dstu, *dstv; + + image = vb2_plane_vaddr(&fbuf->vb, 0); + + yuv = fbuf->data + pdev->frame_header_size; /* Skip header */ + + /* Raw format; that's easy... */ + if (pdev->pixfmt != V4L2_PIX_FMT_YUV420) + { + 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); + vb2_set_plane_payload(&fbuf->vb, 0, + pdev->frame_size + sizeof(struct pwc_raw_frame)); + return 0; + } + + vb2_set_plane_payload(&fbuf->vb, 0, + pdev->width * pdev->height * 3 / 2); + + if (pdev->vbandlength == 0) { + /* Uncompressed mode. + * + * We do some byte shuffling here to go from the + * native format to YUV420P. + */ + src = (u16 *)yuv; + n = pdev->width * pdev->height; + dsty = (u16 *)(image); + dstu = (u16 *)(image + n); + dstv = (u16 *)(image + n + n / 4); + + for (line = 0; line < pdev->height; line++) { + for (col = 0; col < pdev->width; col += 4) { + *dsty++ = *src++; + *dsty++ = *src++; + if (line & 1) + *dstv++ = *src++; + else + *dstu++ = *src++; + } + } + + return 0; + } + + /* + * Compressed; + * the decompressor routines will write the data in planar format + * immediately. + */ + 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); + } + return 0; +} |