I have decided to venture into new teritory. I downloaded a driver (hopefully)
for my webcam. The tar -xed file contains a bunch of c and header programs. I
need to know what to do. These are the programs that I am talking about:
knoppix@bmike1:~/Downloads/nthr cam/pwc-8.11/2.4.21$ ls
ls
pwc-ctrl.c pwc-ioctl.h pwc-uncompress.c pwc.h pwc_nala.h
pwc-if.c pwc-misc.c pwc-uncompress.h pwc_kiara.h pwc_timon.h
One that I find particularly interesting is the pwc-uncompress.c because
(though I am inexperienced) I think that it will uncompress all the other
programs contained with it; however, I am unsure. Could someone teach me what
I need to know and how to run gcc?
--
<:-)~MIKE~(-:>
pss I just read through the code and it seems as if only the .c program starts
another program. So what I am thinking is that I will have to gcc each
individual program. Is this a correct assumption?
ps The text of the 'uncompress' files follow:
/////////////////////////////////////////////////
.h~\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\
/* (C) 1999-2003 Nemosoft Unv. (
webcam@smcc.demon.nl)
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
*/
/* This file is the bridge between the kernel module and the plugin; it
describes the structures and datatypes used in both modules. Any
significant change should be reflected by increasing the
pwc_decompressor_version major number.
*/
#ifndef PWC_UNCOMPRESS_H
#define PWC_UNCOMPRESS_H
#include <linux/config.h>
#include <linux/list.h>
#include "pwc.h"
#ifdef __cplusplus
extern "C" {
#endif
/* The decompressor structure.
Every type of decompressor registers itself with the main module.
When a device is opened, it looks up the correct compressor, and
uses that when a compressed video mode is requested.
*/
struct pwc_decompressor
{
int type; /* type of camera (645, 680, etc) */
int table_size; /* memory needed */
void (* init)(int release, void *buffer, void *table); /* Initialization
routine; should be called after each set_video_mode */
void (* exit)(void); /* Cleanup routine */
void (* decompress)(struct pwc_coord *image, struct pwc_coord *view, struct
pwc_coord *offset,
void *src, void *dst, int planar,
void *table, int bandlength);
void (* lock)(void); /* make sure module cannot be unloaded */
void (* unlock)(void); /* release lock on module */
struct list_head pwcd_list;
};
/* Our structure version number. Is set to the version number major */
extern const int pwc_decompressor_version;
/* Adds decompressor to list, based on its 'type' field (which matches the
'type' field in pwc_device; ignores any double requests */
extern void pwc_register_decompressor(struct pwc_decompressor *pwcd);
/* Removes decompressor, based on the type number */
extern void pwc_unregister_decompressor(int type);
/* Returns pointer to decompressor struct, or NULL if it doesn't exist */
extern struct pwc_decompressor *pwc_find_decompressor(int type);
#ifdef CONFIG_USB_PWCX
/* If the decompressor is compiled in, we must call these manually */
extern int usb_pwcx_init(void);
extern void usb_pwcx_exit(void);
#endif
#ifdef __cplusplus
}
#endif
#endif
/////////////////////////////////////////////////
.c~\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\
/* Linux driver for Philips webcam
Decompression frontend.
(C) 1999-2003 Nemosoft Unv. (
webcam@smcc.demon.nl)
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
*/
/*
This is where the decompression routines register and unregister
themselves. It also has a decompressor wrapper function.
*/
#include <asm/types.h>
#include "pwc.h"
#include "pwc-uncompress.h"
/* This contains a list of all registered decompressors */
static LIST_HEAD(pwc_decompressor_list);
/* Should the pwc_decompress structure ever change, we increase the
version number so that we don't get nasty surprises, or can
dynamically adjust our structure.
*/
const int pwc_decompressor_version = PWC_MAJOR;
/* Add decompressor to list, ignoring duplicates */
void pwc_register_decompressor(struct pwc_decompressor *pwcd)
{
if (pwc_find_decompressor(pwcd->type) == NULL) {
Trace(TRACE_PWCX, "Adding decompressor for model %d.\n", pwcd->type);
list_add_tail(&pwcd->pwcd_list, &pwc_decompressor_list);
}
}
/* Remove decompressor from list */
void pwc_unregister_decompressor(int type)
{
struct pwc_decompressor *find;
find = pwc_find_decompressor(type);
if (find != NULL) {
Trace(TRACE_PWCX, "Removing decompressor for model %d.\n", type);
list_del(&find->pwcd_list);
}
}
/* Find decompressor in list */
struct pwc_decompressor *pwc_find_decompressor(int type)
{
struct list_head *tmp;
struct pwc_decompressor *pwcd;
list_for_each(tmp, &pwc_decompressor_list) {
pwcd = list_entry(tmp, struct pwc_decompressor, pwcd_list);
if (pwcd->type == type)
return pwcd;
}
return NULL;
}
int pwc_decompress(struct pwc_device *pdev)
{
struct pwc_frame_buf *fbuf;
int n, line, col, stride;
void *yuv, *image;
u16 *src;
u16 *dsty, *dstu, *dstv;
if (pdev == NULL)
return -EFAULT;
#if defined(__KERNEL__) && defined(PWC_MAGIC)
if (pdev->magic != PWC_MAGIC) {
Err("pwc_decompress(): magic failed.\n");
return -EFAULT;
}
#endif
fbuf = pdev->read_frame;
if (fbuf == NULL)
return -EFAULT;
image = pdev->image_ptr[pdev->fill_image];
if (!image)
return -EFAULT;
yuv = fbuf->data + pdev->frame_header_size; /* Skip header */
if (pdev->vbandlength == 0) {
/* Uncompressed mode. We copy the data into the output buffer,
using the viewport size (which may be larger than the image
size). Unfortunately we have to do a bit of byte stuffing
to get the desired output format/size.
*/
/*
* We do some byte shuffling here to go from the
* native format to YUV420P.
*/
src = (u16 *)yuv;
n = pdev->view.x * pdev->view.y;
/* offset in Y plane */
stride = pdev->view.x * pdev->offset.y + pdev->offset.x;
dsty = (u16 *)(image + stride);
/* offsets in U/V planes */
stride = pdev->view.x * pdev->offset.y / 4 + pdev->offset.x / 2;
dstu = (u16 *)(image + n + stride);
dstv = (u16 *)(image + n + n / 4 + stride);
/* increment after each line */
stride = (pdev->view.x - pdev->image.x) / 2; /* u16 is 2 bytes */
for (line = 0; line < pdev->image.y; line++) {
for (col = 0; col < pdev->image.x; col += 4) {
*dsty++ = *src++;
*dsty++ = *src++;
if (line & 1)
*dstv++ = *src++;
else
*dstu++ = *src++;
}
dsty += stride;
if (line & 1)
dstv += (stride >> 1);
else
dstu += (stride >> 1);
}
}
else {
/* Compressed; the decompressor routines will write the data
in planar format immediately.
*/
if (pdev->decompressor)
pdev->decompressor->decompress(
&pdev->image, &pdev->view, &pdev->offset,
yuv, image,
1,
pdev->decompress_data, pdev->vbandlength);
else
return -ENXIO; /* No such device or address: missing decompressor */
}
return 0;
}
/* Make sure these functions are available for the decompressor plugin
both when this code is compiled into the kernel or as as module.
*/
EXPORT_SYMBOL_NOVERS(pwc_decompressor_version);
EXPORT_SYMBOL(pwc_register_decompressor);
EXPORT_SYMBOL(pwc_unregister_decompressor);
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