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/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* UVC gadget test application
*
* Copyright (C) 2010 Ideas on board SPRL
*
* Contact: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
*/
#include <signal.h>
#include <stdio.h>
#include <unistd.h>
#include "configfs.h"
#include "events.h"
#include "stream.h"
#include "v4l2-source.h"
static void usage(const char *argv0)
{
fprintf(stderr, "Usage: %s [options] <uvc device>\n", argv0);
fprintf(stderr, "Available options are\n");
fprintf(stderr, " -c device V4L2 source device\n");
fprintf(stderr, " -h Print this help screen and exit\n");
fprintf(stderr, " -i image MJPEG image\n");
fprintf(stderr, "\n");
fprintf(stderr, " <uvc device> UVC device instance specifier\n");
fprintf(stderr, "\n");
fprintf(stderr, " For ConfigFS devices the <uvc device> parameter can take the form of a shortened\n");
fprintf(stderr, " function specifier such as: 'uvc.0', or if multiple gadgets are configured, the\n");
fprintf(stderr, " gadget name should be included to prevent ambiguity: 'g1/functions/uvc.0'.\n");
fprintf(stderr, "\n");
fprintf(stderr, " For legacy g_webcam UVC instances, this parameter will identify the UDC that the\n");
fprintf(stderr, " UVC function is bound to.\n");
fprintf(stderr, "\n");
fprintf(stderr, " The parameter is optional, and if not provided the first UVC function on the first\n");
fprintf(stderr, " gadget identified will be used.\n");
fprintf(stderr, "\n");
fprintf(stderr, "Example usage:\n");
fprintf(stderr, " uvc-gadget uvc.1\n");
fprintf(stderr, " uvc-gadget g1/functions/uvc.1\n");
fprintf(stderr, "\n");
fprintf(stderr, " uvc-gadget musb-hdrc.0.auto\n");
}
/* Necessary for and only used by signal handler. */
static struct events *sigint_events;
static void sigint_handler(int signal)
{
/* Stop the main loop when the user presses CTRL-C */
events_stop(sigint_events);
}
int main(int argc, char *argv[])
{
char *function = NULL;
char *cap_device = "/dev/video1";
struct uvc_function_config *fc;
struct uvc_stream *stream;
struct video_source *src = NULL;
struct events events;
int ret = 0;
int opt;
while ((opt = getopt(argc, argv, "c:h")) != -1) {
switch (opt) {
case 'c':
cap_device = optarg;
break;
case 'h':
usage(argv[0]);
return 0;
default:
fprintf(stderr, "Invalid option '-%c'\n", opt);
usage(argv[0]);
return 1;
}
}
if (argv[optind] != NULL)
function = argv[optind];
fc = configfs_parse_uvc_function(function);
if (!fc) {
printf("Failed to identify function configuration\n");
return 1;
}
/*
* Create the events handler. Register a signal handler for SIGINT,
* received when the user presses CTRL-C. This will allow the main loop
* to be interrupted, and resources to be freed cleanly.
*/
events_init(&events);
sigint_events = &events;
signal(SIGINT, sigint_handler);
/* Create and initialize a video source. */
src = v4l2_video_source_create(cap_device);
if (src == NULL) {
ret = 1;
goto done;
}
v4l2_video_source_init(src, &events);
/* Create and initialise the stream. */
stream = uvc_stream_new(fc->video);
if (stream == NULL) {
ret = 1;
goto done;
}
uvc_stream_set_event_handler(stream, &events);
uvc_stream_set_video_source(stream, src);
uvc_stream_init_uvc(stream, fc);
/* Main capture loop */
events_loop(&events);
done:
/* Cleanup */
uvc_stream_delete(stream);
video_source_destroy(src);
events_cleanup(&events);
configfs_free_uvc_function(fc);
return ret;
}
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