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1da177e4 LT |
1 | /* Linux driver for Philips webcam |
2 | Decompression frontend. | |
3 | (C) 1999-2003 Nemosoft Unv. | |
2b455db6 | 4 | (C) 2004-2006 Luc Saillard (luc@saillard.org) |
1da177e4 LT |
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 | |
2b455db6 LS |
25 | |
26 | vim: set ts=8: | |
1da177e4 LT |
27 | */ |
28 | ||
29 | #include <asm/current.h> | |
30 | #include <asm/types.h> | |
31 | ||
32 | #include "pwc.h" | |
2b455db6 LS |
33 | #include "pwc-dec1.h" |
34 | #include "pwc-dec23.h" | |
1da177e4 | 35 | |
885fe18f | 36 | int pwc_decompress(struct pwc_device *pdev, struct pwc_frame_buf *fbuf) |
1da177e4 | 37 | { |
795e6eb3 | 38 | int n, line, col; |
1da177e4 LT |
39 | void *yuv, *image; |
40 | u16 *src; | |
41 | u16 *dsty, *dstu, *dstv; | |
42 | ||
2d700715 | 43 | image = vb2_plane_vaddr(&fbuf->vb.vb2_buf, 0); |
1da177e4 LT |
44 | |
45 | yuv = fbuf->data + pdev->frame_header_size; /* Skip header */ | |
46 | ||
47 | /* Raw format; that's easy... */ | |
479567ce | 48 | if (pdev->pixfmt != V4L2_PIX_FMT_YUV420) |
1da177e4 | 49 | { |
2b455db6 LS |
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); | |
2d700715 | 58 | vb2_set_plane_payload(&fbuf->vb.vb2_buf, 0, |
885fe18f | 59 | pdev->frame_size + sizeof(struct pwc_raw_frame)); |
1da177e4 LT |
60 | return 0; |
61 | } | |
62 | ||
2d700715 | 63 | vb2_set_plane_payload(&fbuf->vb.vb2_buf, 0, |
795e6eb3 | 64 | pdev->width * pdev->height * 3 / 2); |
885fe18f | 65 | |
1da177e4 | 66 | if (pdev->vbandlength == 0) { |
2b455db6 | 67 | /* Uncompressed mode. |
2b455db6 LS |
68 | * |
69 | * We do some byte shuffling here to go from the | |
70 | * native format to YUV420P. | |
1da177e4 | 71 | */ |
2b455db6 | 72 | src = (u16 *)yuv; |
795e6eb3 HG |
73 | n = pdev->width * pdev->height; |
74 | dsty = (u16 *)(image); | |
75 | dstu = (u16 *)(image + n); | |
76 | dstv = (u16 *)(image + n + n / 4); | |
2b455db6 | 77 | |
795e6eb3 HG |
78 | for (line = 0; line < pdev->height; line++) { |
79 | for (col = 0; col < pdev->width; col += 4) { | |
2b455db6 LS |
80 | *dsty++ = *src++; |
81 | *dsty++ = *src++; | |
1da177e4 | 82 | if (line & 1) |
2b455db6 | 83 | *dstv++ = *src++; |
1da177e4 | 84 | else |
2b455db6 | 85 | *dstu++ = *src++; |
1da177e4 | 86 | } |
2b455db6 LS |
87 | } |
88 | ||
89 | return 0; | |
1da177e4 | 90 | } |
2b455db6 LS |
91 | |
92 | /* | |
93 | * Compressed; | |
94 | * the decompressor routines will write the data in planar format | |
95 | * immediately. | |
96 | */ | |
2b455db6 LS |
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 { | |
dc8a7e83 | 104 | pwc_dec23_decompress(pdev, yuv, image); |
1da177e4 LT |
105 | } |
106 | return 0; | |
107 | } |