1 /* Linux driver for Philips webcam 2 Decompression frontend. 3 (C) 1999-2003 Nemosoft Unv. 4 (C) 2004-2006 Luc Saillard (luc@saillard.org) 5 6 NOTE: this version of pwc is an unofficial (modified) release of pwc & pcwx 7 driver and thus may have bugs that are not present in the original version. 8 Please send bug reports and support requests to <luc@saillard.org>. 9 The decompression routines have been implemented by reverse-engineering the 10 Nemosoft binary pwcx module. Caveat emptor. 11 12 This program is free software; you can redistribute it and/or modify 13 it under the terms of the GNU General Public License as published by 14 the Free Software Foundation; either version 2 of the License, or 15 (at your option) any later version. 16 17 This program is distributed in the hope that it will be useful, 18 but WITHOUT ANY WARRANTY; without even the implied warranty of 19 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 20 GNU General Public License for more details. 21 22 You should have received a copy of the GNU General Public License 23 along with this program; if not, write to the Free Software 24 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 25 26 vim: set ts=8: 27 */ 28 29 #include <asm/current.h> 30 #include <asm/types.h> 31 32 #include "pwc.h" 33 #include "pwc-dec1.h" 34 #include "pwc-dec23.h" 35 36 int pwc_decompress(struct pwc_device *pdev, struct pwc_frame_buf *fbuf) 37 { 38 int n, line, col; 39 void *yuv, *image; 40 u16 *src; 41 u16 *dsty, *dstu, *dstv; 42 43 image = vb2_plane_vaddr(&fbuf->vb.vb2_buf, 0); 44 45 yuv = fbuf->data + pdev->frame_header_size; /* Skip header */ 46 47 /* Raw format; that's easy... */ 48 if (pdev->pixfmt != V4L2_PIX_FMT_YUV420) 49 { 50 struct pwc_raw_frame *raw_frame = image; 51 raw_frame->type = cpu_to_le16(pdev->type); 52 raw_frame->vbandlength = cpu_to_le16(pdev->vbandlength); 53 /* cmd_buf is always 4 bytes, but sometimes, only the 54 * first 3 bytes is filled (Nala case). We can 55 * determine this using the type of the webcam */ 56 memcpy(raw_frame->cmd, pdev->cmd_buf, 4); 57 memcpy(raw_frame+1, yuv, pdev->frame_size); 58 vb2_set_plane_payload(&fbuf->vb.vb2_buf, 0, 59 pdev->frame_size + sizeof(struct pwc_raw_frame)); 60 return 0; 61 } 62 63 vb2_set_plane_payload(&fbuf->vb.vb2_buf, 0, 64 pdev->width * pdev->height * 3 / 2); 65 66 if (pdev->vbandlength == 0) { 67 /* Uncompressed mode. 68 * 69 * We do some byte shuffling here to go from the 70 * native format to YUV420P. 71 */ 72 src = (u16 *)yuv; 73 n = pdev->width * pdev->height; 74 dsty = (u16 *)(image); 75 dstu = (u16 *)(image + n); 76 dstv = (u16 *)(image + n + n / 4); 77 78 for (line = 0; line < pdev->height; line++) { 79 for (col = 0; col < pdev->width; col += 4) { 80 *dsty++ = *src++; 81 *dsty++ = *src++; 82 if (line & 1) 83 *dstv++ = *src++; 84 else 85 *dstu++ = *src++; 86 } 87 } 88 89 return 0; 90 } 91 92 /* 93 * Compressed; 94 * the decompressor routines will write the data in planar format 95 * immediately. 96 */ 97 if (DEVICE_USE_CODEC1(pdev->type)) { 98 99 /* TODO & FIXME */ 100 PWC_ERROR("This chipset is not supported for now\n"); 101 return -ENXIO; /* No such device or address: missing decompressor */ 102 103 } else { 104 pwc_dec23_decompress(pdev, yuv, image); 105 } 106 return 0; 107 } 108