lavd: add list devices API

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

3 files changed, 82 insertions, 2 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);
+}
diff --git a/libavdevice/avdevice.h b/libavdevice/avdevice.h
index 3306020628..28344ca161 100644
--- a/libavdevice/avdevice.h
+++ b/libavdevice/avdevice.h
@@ -191,4 +191,43 @@ int avdevice_dev_to_app_control_message(struct AVFormatContext *s,
                                         enum AVDevToAppMessageType type,
                                         void *data, size_t data_size);
 
+/**
+ * Structure describes basic parameters of the device.
+ */
+typedef struct AVDeviceInfo {
+    char *device_name;                   /**< device name, format depends on device */
+    char *device_description;            /**< human friendly name */
+} AVDeviceInfo;
+
+/**
+ * List of devices.
+ */
+typedef struct AVDeviceInfoList {
+    AVDeviceInfo **devices;              /**< list of autodetected devices */
+    int nb_devices;                      /**< number of autodetected devices */
+    int default_device;                  /**< index of default device or -1 if no default */
+} AVDeviceInfoList;
+
+/**
+ * List devices.
+ *
+ * Returns available device names and their parameters.
+ *
+ * @note: Some devices may accept system-dependent device names that cannot be
+ *        autodetected. The list returned by this function cannot be assumed to
+ *        be always completed.
+ *
+ * @param s                device context.
+ * @param[out] device_list list of autodetected devices.
+ * @return count of autodetected devices, negative on error.
+ */
+int avdevice_list_devices(struct AVFormatContext *s, AVDeviceInfoList **device_list);
+
+/**
+ * Convinient function to free result of avdevice_list_devices().
+ *
+ * @param devices device list to be freed.
+ */
+void avdevice_free_list_devices(AVDeviceInfoList **device_list);
+
 #endif /* AVDEVICE_AVDEVICE_H */
diff --git a/libavdevice/version.h b/libavdevice/version.h
index 55d7e93b3b..85b3b37662 100644
--- a/libavdevice/version.h
+++ b/libavdevice/version.h
@@ -28,8 +28,8 @@
 #include "libavutil/version.h"
 
 #define LIBAVDEVICE_VERSION_MAJOR  55
-#define LIBAVDEVICE_VERSION_MINOR   9
-#define LIBAVDEVICE_VERSION_MICRO 101
+#define LIBAVDEVICE_VERSION_MINOR  10
+#define LIBAVDEVICE_VERSION_MICRO 100
 
 #define LIBAVDEVICE_VERSION_INT AV_VERSION_INT(LIBAVDEVICE_VERSION_MAJOR, \
                                                LIBAVDEVICE_VERSION_MINOR, \