This can change the the MSS value announced to the other end in
the initial TCP packet, it's can be used when failed Path MTU
discovery.
Signed-off-by: Jun Zhao <mypopy...@gmail.com>
---
libavformat/tcp.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/libavformat/tcp.c b/libavformat/tcp.c
index b0289f8..1d51710 100644
--- a/libavformat/tcp.c
+++ b/libavformat/tcp.c
@@ -42,6 +42,7 @@ typedef struct TCPContext {
int recv_buffer_size;
int send_buffer_size;
int tcp_nodelay;
+ int tcp_mss;
} TCPContext;
#define OFFSET(x) offsetof(TCPContext, x)
@@ -54,6 +55,7 @@ static const AVOption options[] = {
{ "send_buffer_size", "Socket send buffer size (in bytes)",
OFFSET(send_buffer_size), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, INT_MAX,
.flags = D|E },
{ "recv_buffer_size", "Socket receive buffer size (in bytes)",
OFFSET(recv_buffer_size), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, INT_MAX,
.flags = D|E },
{ "tcp_nodelay", "Use TCP_NODELAY to disable nagle's algorithm",
OFFSET(tcp_nodelay), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, .flags =
D|E },
+ { "tcp_mss", "Maximum segment size for outgoing TCP packets",
OFFSET(tcp_mss), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, INT_MAX,
.flags = D|E },
{ NULL }
};
@@ -153,6 +155,9 @@ static int tcp_open(URLContext *h, const char *uri, int
flags)
if (s->tcp_nodelay > 0) {
setsockopt (fd, IPPROTO_TCP, TCP_NODELAY, &s->tcp_nodelay, sizeof
(s->tcp_nodelay));
}
+ if (s->tcp_mss > 0) {
+ setsockopt (fd, IPPROTO_TCP, TCP_MAXSEG, &s->tcp_mss, sizeof
(s->tcp_mss));
+ }
if (s->listen == 2) {
// multi-client
--
2.7.4
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