lavd: add list devices API

Signed-off-by: Lukasz Marek <lukasz.m.luki@gmail.com>

1 files changed, 41 insertions, 0 deletions

diff --git a/libavdevice/avdevice.c b/libavdevice/avdevice.c
index 51617fb921..9e2b7d52da 100644
--- a/libavdevice/avdevice.c
+++ b/libavdevice/avdevice.c
@@ -52,3 +52,44 @@ int avdevice_dev_to_app_control_message(struct AVFormatContext *s, enum AVDevToA
         return AVERROR(ENOSYS);
     return s->control_message_cb(s, type, data, data_size);
 }
+
+int avdevice_list_devices(AVFormatContext *s, AVDeviceInfoList **device_list)
+{
+    av_assert0(s);
+    av_assert0(device_list);
+    av_assert0(s->oformat || s->iformat);
+    if ((s->oformat && !s->oformat->get_device_list) ||
+        (s->iformat && !s->iformat->get_device_list)) {
+        *device_list = NULL;
+        return AVERROR(ENOSYS);
+    }
+    *device_list = av_mallocz(sizeof(AVDeviceInfoList));
+    if (!(*device_list))
+        return AVERROR(ENOMEM);
+    if (s->oformat)
+        return s->oformat->get_device_list(s, *device_list);
+    return s->iformat->get_device_list(s, *device_list);
+}
+
+void avdevice_free_list_devices(AVDeviceInfoList **device_list)
+{
+    AVDeviceInfoList *list;
+    AVDeviceInfo *dev;
+    int i;
+
+    av_assert0(device_list);
+    list = *device_list;
+    if (!list)
+        return;
+
+    for (i = 0; i < list->nb_devices; i++) {
+        dev = list->devices[i];
+        if (dev) {
+            av_free(dev->device_name);
+            av_free(dev->device_description);
+            av_free(dev);
+        }
+    }
+    av_free(list->devices);
+    av_freep(device_list);
+}