[FFmpeg-cvslog] avformat/rtsp: Fix timeout option

[Andriy Gelman]

ffmpeg | branch: master | Andriy Gelman <andriy.gelman at gmail.com> | Sun May 30 16:24:10 2021 -0400| [8257d6dda6cfdd62eeeecb00bb551539949b2297] | committer: Andriy Gelman

avformat/rtsp: Fix timeout option

92c40ef882be115e72d2aa02f9032b7ce88f8537 added a listen_timeout option
for sdp. This allowed a user to set variable timeout which was
originally hard coded to 10 seconds.

The commit used the initial_timeout variable to store the value. But
this variable is shared with rtsp where it's used to infer a "listen"
mode. Thus, the timeout value could not be set in rtsp, and the default
value (initial_timeout = -1) would give 100ms timeout.

This was attempted to be fixed in c8101aabee654f6d147a4d89f77fa73e18908610,
which changed the meaning of initial_timeout = -1 to be an infinite
timeout. However, it did not address the issue that the timeout could
still not be set. Being able to set the timeout is useful because it
allows to automatically reconfigure from a udp to tcp connection in the
lower transport.

In this commit this is fixed by using the stimeout variable to
store the timeout value.

Signed-off-by: Andriy Gelman <andriy.gelman at gmail.com>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=8257d6dda6cfdd62eeeecb00bb551539949b2297
---

 libavformat/rtsp.c | 12 ++++++------
 libavformat/rtsp.h |  2 +-
 2 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/libavformat/rtsp.c b/libavformat/rtsp.c
index 9f509a229f..d4ab8f28bf 100644
--- a/libavformat/rtsp.c
+++ b/libavformat/rtsp.c
@@ -94,7 +94,7 @@ const AVOption ff_rtsp_options[] = {
     { "min_port", "set minimum local UDP port", OFFSET(rtp_port_min), AV_OPT_TYPE_INT, {.i64 = RTSP_RTP_PORT_MIN}, 0, 65535, DEC|ENC },
     { "max_port", "set maximum local UDP port", OFFSET(rtp_port_max), AV_OPT_TYPE_INT, {.i64 = RTSP_RTP_PORT_MAX}, 0, 65535, DEC|ENC },
     { "listen_timeout", "set maximum timeout (in seconds) to wait for incoming connections (-1 is infinite, imply flag listen)", OFFSET(initial_timeout), AV_OPT_TYPE_INT, {.i64 = -1}, INT_MIN, INT_MAX, DEC },
-    { "timeout", "set timeout (in microseconds) of socket TCP I/O operations", OFFSET(stimeout), AV_OPT_TYPE_INT, {.i64 = 0}, INT_MIN, INT_MAX, DEC },
+    { "timeout", "set timeout (in microseconds) of socket I/O operations", OFFSET(stimeout), AV_OPT_TYPE_INT64, {.i64 = 0}, INT_MIN, INT64_MAX, DEC },
     COMMON_OPTS(),
     { "user_agent", "override User-Agent header", OFFSET(user_agent), AV_OPT_TYPE_STRING, {.str = LIBAVFORMAT_IDENT}, 0, 0, DEC },
     { NULL },
@@ -104,7 +104,7 @@ static const AVOption sdp_options[] = {
     RTSP_FLAG_OPTS("sdp_flags", "SDP flags"),
     { "custom_io", "use custom I/O", 0, AV_OPT_TYPE_CONST, {.i64 = RTSP_FLAG_CUSTOM_IO}, 0, 0, DEC, "rtsp_flags" },
     { "rtcp_to_source", "send RTCP packets to the source address of received packets", 0, AV_OPT_TYPE_CONST, {.i64 = RTSP_FLAG_RTCP_TO_SOURCE}, 0, 0, DEC, "rtsp_flags" },
-    { "listen_timeout", "set maximum timeout (in seconds) to wait for incoming connections", OFFSET(initial_timeout), AV_OPT_TYPE_INT, {.i64 = READ_PACKET_TIMEOUT_S}, INT_MIN, INT_MAX, DEC },
+    { "listen_timeout", "set maximum timeout (in seconds) to wait for incoming connections", OFFSET(stimeout), AV_OPT_TYPE_DURATION, {.i64 = READ_PACKET_TIMEOUT_S*1000000}, INT_MIN, INT64_MAX, DEC },
     RTSP_MEDIATYPE_OPTS("allowed_media_types", "set media types to accept from the server"),
     COMMON_OPTS(),
     { NULL },
@@ -112,7 +112,7 @@ static const AVOption sdp_options[] = {
 
 static const AVOption rtp_options[] = {
     RTSP_FLAG_OPTS("rtp_flags", "set RTP flags"),
-    { "listen_timeout", "set maximum timeout (in seconds) to wait for incoming connections", OFFSET(initial_timeout), AV_OPT_TYPE_INT, {.i64 = READ_PACKET_TIMEOUT_S}, INT_MIN, INT_MAX, DEC },
+    { "listen_timeout", "set maximum timeout (in seconds) to wait for incoming connections", OFFSET(stimeout), AV_OPT_TYPE_DURATION, {.i64 = READ_PACKET_TIMEOUT_S*1000000}, INT_MIN, INT64_MAX, DEC },
     RTSP_MEDIATYPE_OPTS("allowed_media_types", "set media types to accept from the server"),
     COMMON_OPTS(),
     { NULL },
@@ -1874,7 +1874,7 @@ redirect:
         /* open the tcp connection */
         ff_url_join(tcpname, sizeof(tcpname), lower_rtsp_proto, NULL,
                     host, port,
-                    "?timeout=%d", rt->stimeout);
+                    "?timeout=%"PRId64, rt->stimeout);
         if ((ret = ffurl_open_whitelist(&rt->rtsp_hd, tcpname, AVIO_FLAG_READ_WRITE,
                        &s->interrupt_callback, NULL, s->protocol_whitelist, s->protocol_blacklist, NULL)) < 0) {
             err = ret;
@@ -2027,7 +2027,7 @@ static int udp_read_packet(AVFormatContext *s, RTSPStream **prtsp_st,
     int n, i, ret;
     struct pollfd *p = rt->p;
     int *fds = NULL, fdsnum, fdsidx;
-    int runs = rt->initial_timeout * 1000LL / POLLING_TIME;
+    int64_t runs = rt->stimeout / POLLING_TIME / 1000;
 
     if (!p) {
         p = rt->p = av_malloc_array(2 * rt->nb_rtsp_streams + 1, sizeof(*p));
@@ -2088,7 +2088,7 @@ static int udp_read_packet(AVFormatContext *s, RTSPStream **prtsp_st,
                 }
             }
 #endif
-        } else if (n == 0 && rt->initial_timeout > 0 && --runs <= 0) {
+        } else if (n == 0 && rt->stimeout > 0 && --runs <= 0) {
             return AVERROR(ETIMEDOUT);
         } else if (n < 0 && errno != EINTR)
             return AVERROR(errno);
diff --git a/libavformat/rtsp.h b/libavformat/rtsp.h
index 1310dd9c08..4ec974ed73 100644
--- a/libavformat/rtsp.h
+++ b/libavformat/rtsp.h
@@ -404,7 +404,7 @@ typedef struct RTSPState {
     /**
      * timeout of socket i/o operations.
      */
-    int stimeout;
+    int64_t stimeout;
 
     /**
      * Size of RTP packet reordering queue.