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lavf/tcp: add option to setting Maximum Segment Size

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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 <mypopydev@gmail.com>
This commit is contained in:
Jun Zhao 2018-05-06 22:56:01 +08:00 committed by Jun Zhao
parent bce4da85e8
commit 790cf9518a
1 changed files with 11 additions and 0 deletions
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11
libavformat/tcp.c
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@ -42,6 +42,9 @@ typedef struct TCPContext {
int recv_buffer_size;
int send_buffer_size;
int tcp_nodelay;
#if !HAVE_WINSOCK2_H
int tcp_mss;
#endif /* !HAVE_WINSOCK2_H */
} TCPContext;
#define OFFSET(x) offsetof(TCPContext, x)
@ -54,6 +57,9 @@ 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 },
#if !HAVE_WINSOCK2_H
{ "tcp_mss", "Maximum segment size for outgoing TCP packets", OFFSET(tcp_mss), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, INT_MAX, .flags = D|E },
#endif /* !HAVE_WINSOCK2_H */
{ NULL }
};
@ -153,6 +159,11 @@ 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 !HAVE_WINSOCK2_H
if (s->tcp_mss > 0) {
setsockopt (fd, IPPROTO_TCP, TCP_MAXSEG, &s->tcp_mss, sizeof (s->tcp_mss));
}
#endif /* !HAVE_WINSOCK2_H */
if (s->listen == 2) {
// multi-client