lavf: add function to load devices

Author: Josh de Kock

libavdevice/alldevices.c

@@ -105,6 +105,8 @@ static void av_device_init_next(void)
     }
     if (previn)
         previn->next = NULL;
+
+    avpriv_register_devices(outdev_list, indev_list);
 }
 
 void avdevice_register_all(void)
@@ -115,9 +117,11 @@ void avdevice_register_all(void)
 static void *device_next(void *prev, int output,
                          AVClassCategory c1, AVClassCategory c2)
 {
-    pthread_once(&av_device_next_init, av_device_init_next);
     const AVClass *pc;
     AVClassCategory category = AV_CLASS_CATEGORY_NA;
+
+    pthread_once(&av_device_next_init, av_device_init_next);
+
     if (!prev && !(prev = (output ? (void*)outdev_list[0] : (void*)indev_list[0])))
         return NULL;
 

libavformat/allformats.c

@@ -501,6 +501,9 @@ const AVInputFormat *av_demuxer_iterate(void **opaque){
 #if FF_API_NEXT
 pthread_once_t av_format_next_init = PTHREAD_ONCE_INIT;
 
+static AVInputFormat **indev_list = NULL;
+static AVOutputFormat **outdev_list = NULL;
+
 static void av_format_init_next(void)
 {
     AVOutputFormat *prevout = NULL, *out;
@@ -513,10 +516,12 @@ static void av_format_init_next(void)
         prevout = out;
     }
 
-    for (i = 0; (out = (AVOutputFormat*)av_outdev_iterate(&i));) {
-        if (prevout)
-            prevout->next = out;
-        prevout = out;
+    if (outdev_list) {
+        for (i = 0; (out = (AVOutputFormat*)outdev_list[(int)i]); i = (void*)(i + 1)) {
+            if (prevout)
+                prevout->next = out;
+            prevout = out;
+        }
     }
 
     if (prevout)
@@ -528,16 +533,25 @@ static void av_format_init_next(void)
         previn = in;
     }
 
-    for (i = 0; (in = (AVInputFormat*)av_indev_iterate(&i));) {
-        if (previn)
-            previn->next = in;
-        previn = in;
+    if (indev_list) {
+        for (i = 0; (in = (AVInputFormat*)indev_list[(int)i]); i = (void*)(i + 1)) {
+            if (previn)
+                previn->next = in;
+            previn = in;
+        }
     }
 
     if (previn)
         previn->next = NULL;
 }
 
+void avpriv_register_devices(AVOutputFormat *o[], AVInputFormat *i[])
+{
+    outdev_list = o;
+    indev_list = i;
+    av_format_init_next();
+}
+
 AVInputFormat *av_iformat_next(const AVInputFormat *f)
 {
     void *i = 0;

libavformat/avformat.h

@@ -2013,6 +2013,10 @@ int avformat_network_init(void);
 int avformat_network_deinit(void);
 
 #if FF_API_NEXT
+/**
+  * Register devices in deprecated format linked list.
+  */
+void avpriv_register_devices(AVOutputFormat *o[], AVInputFormat *i[]);
 /**
  * If f is NULL, returns the first registered input format,
  * if f is non-NULL, returns the next registered input format after f