66 lines
1.4 KiB
C
66 lines
1.4 KiB
C
#include <string.h>
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#include <stdarg.h>
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#include <stdio.h>
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#include <termios.h>
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#include <unistd.h>
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#include <sys/ioctl.h>
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#include <sys/syscall.h>
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#include <linux/media.h>
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#include "util/opts/log.h"
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// This is special code to force `libcamera` to think that given sensor is different
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// ex.: fake `arducam_64mp` to be run as `imx519`
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void fake_camera_sensor(struct media_v2_topology *topology)
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{
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struct media_v2_entity *ents = (struct media_v2_entity *)(intptr_t)topology->ptr_entities;
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if (!ents) {
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return;
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}
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const char *fake_camera = getenv("FAKE_CAMERA_SENSOR");
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if (!fake_camera) {
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return;
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}
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char source[256];
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strcpy(source, fake_camera);
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char *target = strstr(source, "=");
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if (!target) {
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return;
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}
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*target++ = ' ';
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for (int i = 0; i < topology->num_entities; i++) {
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if (strncmp(ents[i].name, source, target-source) != 0) {
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continue;
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}
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char name[sizeof(ents[i].name)];
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strcpy(name, target);
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strcat(name, " ");
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strcat(name, ents[i].name + (target-source));
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LOG_INFO(NULL, "Rewrote entity (%d): %s => %s", i, ents[i].name, name);
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strcpy(ents[i].name, name);
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}
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}
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int ioctl (int fd, unsigned long int req, ...)
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{
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void *arg;
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va_list ap;
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va_start(ap, req);
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arg = va_arg(ap, void *);
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va_end(ap);
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int ret = syscall(SYS_ioctl, fd, req, arg);
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if (!ret && req == MEDIA_IOC_G_TOPOLOGY) {
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fake_camera_sensor(arg);
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}
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return ret;
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}
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