Enumerate v4l2 devices

cmd/list-devices/main.c

@@ -0,0 +1,43 @@
+#include "util/opts/log.h"
+#include "util/opts/fourcc.h"
+#include "device/device.h"
+#include "device/device_list.h"
+
+#include <signal.h>
+#include <unistd.h>
+
+log_options_t log_options = {
+  .debug = true,
+  .verbose = true
+};
+
+void print_formats(const char *type, device_info_formats_t *formats)
+{
+  if (!formats->n) {
+    return;
+  }
+
+  printf("- %s: ", type);
+  for (int j = 0; j < formats->n; j++) {
+    printf("%s ", fourcc_to_string(formats->formats[j]).buf);
+  }
+  printf("\n");
+}
+
+int main(int argc, const char *argv[])
+{
+  device_list_t *list = device_list_v4l2();
+
+  printf("Found %d devices\n", list->ndevices);
+
+  for (int i = 0; i < list->ndevices; i++) {
+    device_info_t * info = &list->devices[i];
+
+    printf("Device %d: %s / %s / camera: %d, m2m: %d\n", i, info->name, info->path, info->camera, info->m2m);
+    print_formats("Output / IN", &info->output_formats);
+    print_formats("Capture / OUT", &info->capture_formats);
+  }
+
+  device_list_free(list);
+  return 0;
+}