[FFmpeg-devel] [PATCH v2] lavf/libsrt: nonblock enabling correction

[Anthony Delannoy]

As written in https://github.com/Haivision/srt/blob/v1.4.1/docs/API.md,
the nonblock mode is activated if SRTO_SNDSYN and SRTO_RCVSYN, for
sending and receiving respectively, are set to 0.
---
 libavformat/libsrt.c | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/libavformat/libsrt.c b/libavformat/libsrt.c
index 16975b6d94..6e230c254b 100644
--- a/libavformat/libsrt.c
+++ b/libavformat/libsrt.c
@@ -152,12 +152,21 @@ static int libsrt_neterrno(URLContext *h)
     return AVERROR_UNKNOWN;
 }
 
+/*
+ * SRT functions can also work in blocking and non-blocking mode, for which
+ * there are two separate options for sending and receiving: SRTO_SNDSYN and
+ * SRTO_RCVSYN.
+ * Setting SRTO_{SND,RCV}SYN options to 1 enable blocking mode, setting them
+ * to 0 enable non-blocking mode.
+ */
 static int libsrt_socket_nonblock(int socket, int enable)
 {
-    int ret = srt_setsockopt(socket, 0, SRTO_SNDSYN, &enable, sizeof(enable));
+    int ret, blocking = enable ? 0 : 1;
+
+    ret = srt_setsockopt(socket, 0, SRTO_SNDSYN, &blocking, sizeof(blocking));
     if (ret < 0)
         return ret;
-    return srt_setsockopt(socket, 0, SRTO_RCVSYN, &enable, sizeof(enable));
+    return srt_setsockopt(socket, 0, SRTO_RCVSYN, &blocking, sizeof(blocking));
 }
 
 static int libsrt_network_wait_fd(URLContext *h, int eid, int fd, int write)
-- 
2.24.1