Enumerate v4l2 devices

device/device_list.h

@@ -0,0 +1,30 @@
+#pragma once
+
+#include <stdbool.h>
+
+typedef struct device_info_formats_s {
+  unsigned *formats;
+  unsigned n;
+} device_info_formats_t;
+
+typedef struct device_info_s {
+  char *name;
+  char *path;
+
+  bool camera;
+  bool m2m;
+
+  device_info_formats_t output_formats;
+  device_info_formats_t capture_formats;
+} device_info_t;
+
+typedef struct device_list_s {
+  device_info_t *devices;
+  int ndevices;
+} device_list_t;
+
+device_list_t *device_list_v4l2();
+bool device_info_has_format(device_info_t *info, bool capture, unsigned format);
+device_info_t *device_list_find_m2m_format(device_list_t *list, unsigned output, unsigned capture);
+device_info_t *device_list_find_m2m_formats(device_list_t *list, unsigned output, unsigned capture_formats[], unsigned *found_format);
+void device_list_free(device_list_t *list);