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avformat/libsrt: add snddropdelay parameter for srt 

Reviewed-by: "zhilizhao(赵志立)" <quinkblack@foxmail.com>
Signed-off-by: Limin Wang <lance.lmwang@gmail.com>
This commit is contained in:
Limin Wang 2021-10-10 23:03:26 +08:00
parent 90a0da9f14
commit 6260c611c5
2 changed files with 13 additions and 0 deletions
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6
doc/protocols.texi
View File

@ -1496,6 +1496,12 @@ when the old encryption key is decommissioned. Default is -1.
-1 means auto (0x1000 in srt library). The range for
this option is integers in the 0 - @code{INT_MAX}.
@item snddropdelay=@var{microseconds}
The sender's extra delay before dropping packets. This delay is
added to the default drop delay time interval value.
Special value -1: Do not drop packets on the sender at all.
@item payload_size=@var{bytes}
Sets the maximum declared size of a packet transferred
during the single call to the sending function in Live

7
libavformat/libsrt.c
View File

@ -65,6 +65,7 @@ typedef struct SRTContext {
int enforced_encryption;
int kmrefreshrate;
int kmpreannounce;
int64_t snddropdelay;
#endif
int mss;
int ffs;
@ -111,6 +112,7 @@ static const AVOption libsrt_options[] = {
{ "enforced_encryption", "Enforces that both connection parties have the same passphrase set", OFFSET(enforced_encryption), AV_OPT_TYPE_BOOL, { .i64 = -1 }, -1, 1, .flags = D|E },
{ "kmrefreshrate", "The number of packets to be transmitted after which the encryption key is switched to a new key", OFFSET(kmrefreshrate), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, INT_MAX, .flags = D|E },
{ "kmpreannounce", "The interval between when a new encryption key is sent and when switchover occurs", OFFSET(kmpreannounce), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, INT_MAX, .flags = D|E },
{ "snddropdelay", "The sender's extra delay(in microseconds) before dropping packets", OFFSET(snddropdelay), AV_OPT_TYPE_INT64, { .i64 = -2 }, -2, INT64_MAX, .flags = D|E },
#endif
{ "mss", "The Maximum Segment Size", OFFSET(mss), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, 1500, .flags = D|E },
{ "ffs", "Flight flag size (window size) (in bytes)", OFFSET(ffs), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, INT_MAX, .flags = D|E },
@ -318,6 +320,7 @@ static int libsrt_set_options_pre(URLContext *h, int fd)
int latency = s->latency / 1000;
int rcvlatency = s->rcvlatency / 1000;
int peerlatency = s->peerlatency / 1000;
int snddropdelay = s->snddropdelay > 0 ? s->snddropdelay / 1000 : s->snddropdelay;
int connect_timeout = s->connect_timeout;
if ((s->mode == SRT_MODE_RENDEZVOUS && libsrt_setsockopt(h, fd, SRTO_RENDEZVOUS, "SRTO_RENDEZVOUS", &yes, sizeof(yes)) < 0) ||
@ -334,6 +337,7 @@ static int libsrt_set_options_pre(URLContext *h, int fd)
#endif
(s->kmrefreshrate >= 0 && libsrt_setsockopt(h, fd, SRTO_KMREFRESHRATE, "SRTO_KMREFRESHRATE", &s->kmrefreshrate, sizeof(s->kmrefreshrate)) < 0) ||
(s->kmpreannounce >= 0 && libsrt_setsockopt(h, fd, SRTO_KMPREANNOUNCE, "SRTO_KMPREANNOUNCE", &s->kmpreannounce, sizeof(s->kmpreannounce)) < 0) ||
(s->snddropdelay >=-1 && libsrt_setsockopt(h, fd, SRTO_SNDDROPDELAY, "SRTO_SNDDROPDELAY", &snddropdelay, sizeof(snddropdelay)) < 0) ||
#endif
(s->mss >= 0 && libsrt_setsockopt(h, fd, SRTO_MSS, "SRTO_MSS", &s->mss, sizeof(s->mss)) < 0) ||
(s->ffs >= 0 && libsrt_setsockopt(h, fd, SRTO_FC, "SRTO_FC", &s->ffs, sizeof(s->ffs)) < 0) ||
@ -549,6 +553,9 @@ static int libsrt_open(URLContext *h, const char *uri, int flags)
if (av_find_info_tag(buf, sizeof(buf), "kmpreannounce", p)) {
s->kmpreannounce = strtol(buf, NULL, 10);
}
if (av_find_info_tag(buf, sizeof(buf), "snddropdelay", p)) {
s->snddropdelay = strtoll(buf, NULL, 10);
}
#endif
if (av_find_info_tag(buf, sizeof(buf), "mss", p)) {
s->mss = strtol(buf, NULL, 10);