lavu/threadmessage: add av_thread_message_queue_nb_elems()

libavutil/threadmessage.c

@@ -102,6 +102,19 @@ void av_thread_message_queue_free(AVThreadMessageQueue **mq)
 #endif
 }
 
+int av_thread_message_queue_nb_elems(AVThreadMessageQueue *mq)
+{
+#if HAVE_THREADS
+    int ret;
+    pthread_mutex_lock(&mq->lock);
+    ret = av_fifo_size(mq->fifo);
+    pthread_mutex_unlock(&mq->lock);
+    return ret / mq->elsize;
+#else
+    return AVERROR(ENOSYS);
+#endif
+}
+
 #if HAVE_THREADS
 
 static int av_thread_message_queue_send_locked(AVThreadMessageQueue *mq,

libavutil/threadmessage.h

@@ -95,6 +95,14 @@ void av_thread_message_queue_set_err_recv(AVThreadMessageQueue *mq,
 void av_thread_message_queue_set_free_func(AVThreadMessageQueue *mq,
                                            void (*free_func)(void *msg));
 
+/**
+ * Return the current number of messages in the queue.
+ *
+ * @return the current number of messages or AVERROR(ENOSYS) if lavu was built
+ *         without thread support
+ */
+int av_thread_message_queue_nb_elems(AVThreadMessageQueue *mq);
+
 /**
  * Flush the message queue
  *

libavutil/version.h

@@ -79,7 +79,7 @@
  */
 
 #define LIBAVUTIL_VERSION_MAJOR  56
-#define LIBAVUTIL_VERSION_MINOR  15
+#define LIBAVUTIL_VERSION_MINOR  16
 #define LIBAVUTIL_VERSION_MICRO 100
 
 #define LIBAVUTIL_VERSION_INT   AV_VERSION_INT(LIBAVUTIL_VERSION_MAJOR, \