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git.proxmox.com Git - mirror_ubuntu-focal-kernel.git/blob - drivers/media/usb/pwc/pwc-uncompress.c
1 /* Linux driver for Philips webcam
2 Decompression frontend.
3 (C) 1999-2003 Nemosoft Unv.
4 (C) 2004-2006 Luc Saillard (luc@saillard.org)
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.
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.
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.
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
29 #include <asm/current.h>
30 #include <asm/types.h>
34 #include "pwc-dec23.h"
36 int pwc_decompress(struct pwc_device
*pdev
, struct pwc_frame_buf
*fbuf
)
41 u16
*dsty
, *dstu
, *dstv
;
43 image
= vb2_plane_vaddr(&fbuf
->vb
, 0);
45 yuv
= fbuf
->data
+ pdev
->frame_header_size
; /* Skip header */
47 /* Raw format; that's easy... */
48 if (pdev
->pixfmt
!= V4L2_PIX_FMT_YUV420
)
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
, 0,
59 pdev
->frame_size
+ sizeof(struct pwc_raw_frame
));
63 vb2_set_plane_payload(&fbuf
->vb
, 0,
64 pdev
->width
* pdev
->height
* 3 / 2);
66 if (pdev
->vbandlength
== 0) {
69 * We do some byte shuffling here to go from the
70 * native format to YUV420P.
73 n
= pdev
->width
* pdev
->height
;
74 dsty
= (u16
*)(image
);
75 dstu
= (u16
*)(image
+ n
);
76 dstv
= (u16
*)(image
+ n
+ n
/ 4);
78 for (line
= 0; line
< pdev
->height
; line
++) {
79 for (col
= 0; col
< pdev
->width
; col
+= 4) {
94 * the decompressor routines will write the data in planar format
97 if (DEVICE_USE_CODEC1(pdev
->type
)) {
100 PWC_ERROR("This chipset is not supported for now\n");
101 return -ENXIO
; /* No such device or address: missing decompressor */
104 pwc_dec23_decompress(pdev
, yuv
, image
);