Перевёрнутые камеры =)
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Kolan Sh
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//<?php cc flipped_webcam.c && ./a.out
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#include <sys/stat.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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struct v4lcontrol_flags_info {
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unsigned short vendor_id;
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unsigned short product_id;
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unsigned short product_mask;
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/*const */char *dmi_board_vendor;
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/*const */char *dmi_board_name;
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/* We could also use the USB manufacturer and product strings some devices have
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const char *manufacturer;
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const char *product; */
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int flags;
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int default_gamma;
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/* Some seldom used dmi strings (for notebooks with bogus info in the board
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entries, but usefull info elsewhere). We keep this at the end as to not
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polute the initalizers for the normal case. */
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/* System (product) vendor / name */
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const char *dmi_system_vendor;
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const char *dmi_system_name;
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/* Board and System versions */
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const char *dmi_board_version;
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const char *dmi_system_version;
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};
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/* Controls */
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enum {
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V4LCONTROL_WHITEBALANCE,
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V4LCONTROL_HFLIP,
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V4LCONTROL_VFLIP,
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V4LCONTROL_GAMMA,
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/* All fake controls above here are auto enabled when not present in hw */
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V4LCONTROL_AUTO_ENABLE_COUNT,
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V4LCONTROL_AUTOGAIN,
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V4LCONTROL_AUTOGAIN_TARGET,
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V4LCONTROL_COUNT
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};
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struct v4lcontrol_data {
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int fd; /* Device fd */
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int flags; /* Flags for this device */
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int priv_flags; /* Internal use only flags */
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int controls; /* Which controls to use for this device */
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unsigned int *shm_values; /* shared memory control value store */
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unsigned int old_values[V4LCONTROL_COUNT]; /* for controls_changed() */
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/*const */struct v4lcontrol_flags_info/* **/flags_info;
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};
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static void v4lcontrol_get_dmi_string(const char *string, char *buf, int size)
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{
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FILE *f;
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char *s, sysfs_name[512];
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snprintf(sysfs_name, sizeof(sysfs_name),
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"/sys/class/dmi/id/%s", string);
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f = fopen(sysfs_name, "r");
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if (!f) {
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/* Try again with a different sysfs path, not sure if this is needed
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but we used to look under /sys/devices/virtual/dmi/id in older
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libv4l versions, but this did not work with some kernels */
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snprintf(sysfs_name, sizeof(sysfs_name),
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"/sys/devices/virtual/dmi/id/%s", string);
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f = fopen(sysfs_name, "r");
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if (!f) {
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buf[0] = 0;
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return;
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}
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}
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s = fgets(buf, size, f);
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if (s)
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s[strlen(s) - 1] = 0;
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fclose(f);
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}
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static int v4lcontrol_get_usb_ids(struct v4lcontrol_data *data,
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unsigned short *vendor_id, unsigned short *product_id)
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{
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FILE *f;
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int i, minor;
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struct stat st;
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char sysfs_name[512];
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char c, *s, buf[32];
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if (fstat(data->fd, &st) || !S_ISCHR(st.st_mode))
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return 0; /* Should never happen */
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/* <Sigh> find ourselve in sysfs */
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for (i = 0; i < 256; i++) {
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snprintf(sysfs_name, sizeof(sysfs_name),
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"/sys/class/video4linux/video%d/dev", i);
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f = fopen(sysfs_name, "r");
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if (!f)
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continue;
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s = fgets(buf, sizeof(buf), f);
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fclose(f);
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if (s && sscanf(buf, "%*d:%d%c", &minor, &c) == 2 && c == '\n'/* &&
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minor == minor(st.st_rdev)*/)
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break;
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}
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if (i == 256)
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return 0; /* Not found, sysfs not mounted? */
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/* Get vendor and product ID */
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snprintf(sysfs_name, sizeof(sysfs_name),
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"/sys/class/video4linux/video%d/device/modalias", i);
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f = fopen(sysfs_name, "r");
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if (f) {
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s = fgets(buf, sizeof(buf), f);
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fclose(f);
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if (!s || sscanf(s, "usb:v%4hxp%4hx%c", vendor_id, product_id, &c) != 3 ||
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c != 'd')
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return 0; /* Not an USB device */
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} else {
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/* Try again assuming the device link points to the usb
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device instead of the usb interface (bug in older versions
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of gspca) */
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/* Get product ID */
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snprintf(sysfs_name, sizeof(sysfs_name),
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"/sys/class/video4linux/video%d/device/idVendor", i);
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f = fopen(sysfs_name, "r");
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if (!f)
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return 0; /* Not an USB device (or no sysfs) */
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s = fgets(buf, sizeof(buf), f);
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fclose(f);
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if (!s || sscanf(s, "%04hx%c", vendor_id, &c) != 2 || c != '\n')
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return 0; /* Should never happen */
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/* Get product ID */
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snprintf(sysfs_name, sizeof(sysfs_name),
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"/sys/class/video4linux/video%d/device/idProduct", i);
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f = fopen(sysfs_name, "r");
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if (!f)
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return 0; /* Should never happen */
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s = fgets(buf, sizeof(buf), f);
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fclose(f);
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if (!s || sscanf(s, "%04hx%c", product_id, &c) != 2 || c != '\n')
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return 0; /* Should never happen */
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}
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return 1;
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}
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int main(int argc, char *argv[])
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{
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char dmi_board_vendor[512], dmi_board_name[512];
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unsigned short vendor_id = 0;
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unsigned short product_id = 0;
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struct v4lcontrol_data *data = calloc(1, sizeof(struct v4lcontrol_data));
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/* Get DMI board and system strings */
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v4lcontrol_get_dmi_string("board_vendor", dmi_board_vendor,
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sizeof(dmi_board_vendor));
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v4lcontrol_get_dmi_string("board_name", dmi_board_name,
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sizeof(dmi_board_name));
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data->flags_info.dmi_board_name = dmi_board_vendor;
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data->flags_info.dmi_board_name = dmi_board_name;
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/* Get Bus and Device ids */
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int got_usb_ids = v4lcontrol_get_usb_ids(data, &vendor_id, &product_id);
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if (!got_usb_ids) {
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fprintf(stderr, "Sorry, webcamera device not recognised :(");
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exit(-1);
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}
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puts("If Your PC is a Laptop add this two strings to mediat-tv/v4l-utils/lib/libv4lconvert/control/libv4lcontrol.c:");
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printf(" { 0x%4.4x, 0x%4.4x, 0, \"%s\", \"%s\",\n", vendor_id, product_id, dmi_board_vendor, dmi_board_name);
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puts(" V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },");
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puts("\n");
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puts("Otherwise if Your PC is a Desktop string lines should look like this:");
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printf(" { 0x%4.4x, 0x%4.4x, 0, NULL, NULL,\n", vendor_id, product_id);
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puts(" V4LCONTROL_HFLIPPED | V4LCONTROL_VFLIPPED },");
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puts("\n");
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puts("Rebuild the package and send to v4l maintainers Your camera info.");
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return EXIT_SUCCESS;
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}//?>
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