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ffmpeg/libavformat/libsrt.c

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/*
* This file is part of Libav.
*
* Libav is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* Libav is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
* Haivision Open SRT (Secure Reliable Transport) protocol
*/
#include <srt/srt.h>
#include "libavutil/avassert.h"
#include "libavutil/opt.h"
#include "libavutil/parseutils.h"
#include "libavutil/time.h"
#include "avformat.h"
#include "internal.h"
#include "network.h"
#include "os_support.h"
#include "url.h"
/* This is for MPEG-TS and it's a default SRTO_PAYLOADSIZE for SRTT_LIVE (8 TS packets) */
#ifndef SRT_LIVE_DEFAULT_PAYLOAD_SIZE
#define SRT_LIVE_DEFAULT_PAYLOAD_SIZE 1316
#endif
/* This is the maximum payload size for Live mode, should you have a different payload type than MPEG-TS */
#ifndef SRT_LIVE_MAX_PAYLOAD_SIZE
#define SRT_LIVE_MAX_PAYLOAD_SIZE 1456
#endif
enum SRTMode {
SRT_MODE_CALLER = 0,
SRT_MODE_LISTENER = 1,
SRT_MODE_RENDEZVOUS = 2
};
typedef struct SRTContext {
const AVClass *class;
int fd;
int eid;
int64_t rw_timeout;
int64_t listen_timeout;
int recv_buffer_size;
int send_buffer_size;
int64_t maxbw;
int pbkeylen;
char *passphrase;
int mss;
int ffs;
int ipttl;
int iptos;
int64_t inputbw;
int oheadbw;
int64_t tsbpddelay;
int tlpktdrop;
int nakreport;
int64_t connect_timeout;
int payload_size;
enum SRTMode mode;
} SRTContext;
#define D AV_OPT_FLAG_DECODING_PARAM
#define E AV_OPT_FLAG_ENCODING_PARAM
#define OFFSET(x) offsetof(SRTContext, x)
static const AVOption libsrt_options[] = {
{ "rw_timeout", "Timeout of socket I/O operations", OFFSET(rw_timeout), AV_OPT_TYPE_INT64, { .i64 = -1 }, -1, INT64_MAX, .flags = D|E },
{ "listen_timeout", "Connection awaiting timeout", OFFSET(listen_timeout), AV_OPT_TYPE_INT64, { .i64 = -1 }, -1, INT64_MAX, .flags = D|E },
{ "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 },
{ "maxbw", "Maximum bandwidth (bytes per second) that the connection can use", OFFSET(maxbw), AV_OPT_TYPE_INT64, { .i64 = -1 }, -1, INT64_MAX, .flags = D|E },
{ "pbkeylen", "Crypto key len in bytes {16,24,32} Default: 16 (128-bit)", OFFSET(pbkeylen), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, 32, .flags = D|E },
{ "passphrase", "Crypto PBKDF2 Passphrase size[0,10..64] 0:disable crypto", OFFSET(passphrase), AV_OPT_TYPE_STRING, { .str = NULL }, .flags = D|E },
{ "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 },
{ "ipttl", "IP Time To Live", OFFSET(ipttl), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, 255, .flags = D|E },
{ "iptos", "IP Type of Service", OFFSET(iptos), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, 255, .flags = D|E },
{ "inputbw", "Estimated input stream rate", OFFSET(inputbw), AV_OPT_TYPE_INT64, { .i64 = -1 }, -1, INT64_MAX, .flags = D|E },
{ "oheadbw", "MaxBW ceiling based on % over input stream rate", OFFSET(oheadbw), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, 100, .flags = D|E },
{ "tsbpddelay", "TsbPd receiver delay to absorb burst of missed packet retransmission", OFFSET(tsbpddelay), AV_OPT_TYPE_INT64, { .i64 = -1 }, -1, INT64_MAX, .flags = D|E },
{ "tlpktdrop", "Enable receiver pkt drop", OFFSET(tlpktdrop), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, 1, .flags = D|E },
{ "nakreport", "Enable receiver to send periodic NAK reports", OFFSET(nakreport), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, 1, .flags = D|E },
{ "connect_timeout", "Connect timeout. Caller default: 3000, rendezvous (x 10)", OFFSET(connect_timeout), AV_OPT_TYPE_INT64, { .i64 = -1 }, -1, INT64_MAX, .flags = D|E },
{ "payload size", "maximum declared size of a packet transferred", OFFSET(payload_size), AV_OPT_TYPE_INT, { .i64 = SRT_LIVE_DEFAULT_PAYLOAD_SIZE }, -1, SRT_LIVE_MAX_PAYLOAD_SIZE, .flags = D|E },
{ "ts_size", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = SRT_LIVE_DEFAULT_PAYLOAD_SIZE }, INT_MIN, INT_MAX, .flags = D|E, "payload_size" },
{ "max_size", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = SRT_LIVE_MAX_PAYLOAD_SIZE }, INT_MIN, INT_MAX, .flags = D|E, "payload_size" },
{ "mode", "Connection mode (caller, listener, rendezvous)", OFFSET(mode), AV_OPT_TYPE_INT, { .i64 = SRT_MODE_CALLER }, SRT_MODE_CALLER, SRT_MODE_RENDEZVOUS, .flags = D|E, "mode" },
{ "caller", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = SRT_MODE_CALLER }, INT_MIN, INT_MAX, .flags = D|E, "mode" },
{ "listener", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = SRT_MODE_LISTENER }, INT_MIN, INT_MAX, .flags = D|E, "mode" },
{ "rendezvous", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = SRT_MODE_RENDEZVOUS }, INT_MIN, INT_MAX, .flags = D|E, "mode" },
{ NULL }
};
static int libsrt_neterrno(URLContext *h)
{
int err = srt_getlasterror(NULL);
av_log(h, AV_LOG_ERROR, "%s\n", srt_getlasterror_str());
if (err == SRT_EASYNCRCV)
return AVERROR(EAGAIN);
return AVERROR_UNKNOWN;
}
static int libsrt_socket_nonblock(int socket, int enable)
{
int ret = srt_setsockopt(socket, 0, SRTO_SNDSYN, &enable, sizeof(enable));
if (ret < 0)
return ret;
return srt_setsockopt(socket, 0, SRTO_RCVSYN, &enable, sizeof(enable));
}
static int libsrt_network_wait_fd(URLContext *h, int eid, int fd, int write)
{
int ret, len = 1;
int modes = write ? SRT_EPOLL_OUT : SRT_EPOLL_IN;
SRTSOCKET ready[1];
if (srt_epoll_add_usock(eid, fd, &modes) < 0)
return libsrt_neterrno(h);
if (write) {
ret = srt_epoll_wait(eid, 0, 0, ready, &len, POLLING_TIME, 0, 0, 0, 0);
} else {
ret = srt_epoll_wait(eid, ready, &len, 0, 0, POLLING_TIME, 0, 0, 0, 0);
}
if (ret < 0) {
if (srt_getlasterror(NULL) == SRT_ETIMEOUT)
ret = AVERROR(EAGAIN);
else
ret = libsrt_neterrno(h);
} else {
ret = 0;
}
if (srt_epoll_remove_usock(eid, fd) < 0)
return libsrt_neterrno(h);
return ret;
}
/* TODO de-duplicate code from ff_network_wait_fd_timeout() */
static int libsrt_network_wait_fd_timeout(URLContext *h, int eid, int fd, int write, int64_t timeout, AVIOInterruptCB *int_cb)
{
int ret;
int64_t wait_start = 0;
while (1) {
if (ff_check_interrupt(int_cb))
return AVERROR_EXIT;
ret = libsrt_network_wait_fd(h, eid, fd, write);
if (ret != AVERROR(EAGAIN))
return ret;
if (timeout > 0) {
if (!wait_start)
wait_start = av_gettime_relative();
else if (av_gettime_relative() - wait_start > timeout)
return AVERROR(ETIMEDOUT);
}
}
}
static int libsrt_listen(int eid, int fd, const struct sockaddr *addr, socklen_t addrlen, URLContext *h, int timeout)
{
int ret;
int reuse = 1;
if (srt_setsockopt(fd, SOL_SOCKET, SRTO_REUSEADDR, &reuse, sizeof(reuse))) {
av_log(h, AV_LOG_WARNING, "setsockopt(SRTO_REUSEADDR) failed\n");
}
ret = srt_bind(fd, addr, addrlen);
if (ret)
return libsrt_neterrno(h);
ret = srt_listen(fd, 1);
if (ret)
return libsrt_neterrno(h);
while ((ret = libsrt_network_wait_fd_timeout(h, eid, fd, 1, timeout, &h->interrupt_callback))) {
switch (ret) {
case AVERROR(ETIMEDOUT):
continue;
default:
return ret;
}
}
ret = srt_accept(fd, NULL, NULL);
if (ret < 0)
return libsrt_neterrno(h);
if (libsrt_socket_nonblock(ret, 1) < 0)
av_log(h, AV_LOG_DEBUG, "libsrt_socket_nonblock failed\n");
return ret;
}
static int libsrt_listen_connect(int eid, int fd, const struct sockaddr *addr, socklen_t addrlen, int timeout, URLContext *h, int will_try_next)
{
int ret;
if (libsrt_socket_nonblock(fd, 1) < 0)
av_log(h, AV_LOG_DEBUG, "ff_socket_nonblock failed\n");
while ((ret = srt_connect(fd, addr, addrlen))) {
ret = libsrt_neterrno(h);
switch (ret) {
case AVERROR(EINTR):
if (ff_check_interrupt(&h->interrupt_callback))
return AVERROR_EXIT;
continue;
case AVERROR(EINPROGRESS):
case AVERROR(EAGAIN):
ret = libsrt_network_wait_fd_timeout(h, eid, fd, 1, timeout, &h->interrupt_callback);
if (ret < 0)
return ret;
ret = srt_getlasterror(NULL);
srt_clearlasterror();
if (ret != 0) {
char buf[128];
ret = AVERROR(ret);
av_strerror(ret, buf, sizeof(buf));
if (will_try_next)
av_log(h, AV_LOG_WARNING,
"Connection to %s failed (%s), trying next address\n",
h->filename, buf);
else
av_log(h, AV_LOG_ERROR, "Connection to %s failed: %s\n",
h->filename, buf);
}
default:
return ret;
}
}
return ret;
}
static int libsrt_setsockopt(URLContext *h, int fd, SRT_SOCKOPT optname, const char * optnamestr, const void * optval, int optlen)
{
if (srt_setsockopt(fd, 0, optname, optval, optlen) < 0) {
av_log(h, AV_LOG_ERROR, "failed to set option %s on socket: %s\n", optnamestr, srt_getlasterror_str());
return AVERROR(EIO);
}
return 0;
}
/* - The "POST" options can be altered any time on a connected socket.
They MAY have also some meaning when set prior to connecting; such
option is SRTO_RCVSYN, which makes connect/accept call asynchronous.
Because of that this option is treated special way in this app. */
static int libsrt_set_options_post(URLContext *h, int fd)
{
SRTContext *s = h->priv_data;
if ((s->inputbw >= 0 && libsrt_setsockopt(h, fd, SRTO_INPUTBW, "SRTO_INPUTBW", &s->inputbw, sizeof(s->inputbw)) < 0) ||
(s->oheadbw >= 0 && libsrt_setsockopt(h, fd, SRTO_OHEADBW, "SRTO_OHEADBW", &s->oheadbw, sizeof(s->oheadbw)) < 0)) {
return AVERROR(EIO);
}
return 0;
}
/* - The "PRE" options must be set prior to connecting and can't be altered
on a connected socket, however if set on a listening socket, they are
derived by accept-ed socket. */
static int libsrt_set_options_pre(URLContext *h, int fd)
{
SRTContext *s = h->priv_data;
int yes = 1;
int tsbpddelay = s->tsbpddelay / 1000;
int connect_timeout = s->connect_timeout;
if ((s->mode == SRT_MODE_RENDEZVOUS && libsrt_setsockopt(h, fd, SRTO_RENDEZVOUS, "SRTO_RENDEZVOUS", &yes, sizeof(yes)) < 0) ||
(s->maxbw >= 0 && libsrt_setsockopt(h, fd, SRTO_MAXBW, "SRTO_MAXBW", &s->maxbw, sizeof(s->maxbw)) < 0) ||
(s->pbkeylen >= 0 && libsrt_setsockopt(h, fd, SRTO_PBKEYLEN, "SRTO_PBKEYLEN", &s->pbkeylen, sizeof(s->pbkeylen)) < 0) ||
(s->passphrase && libsrt_setsockopt(h, fd, SRTO_PASSPHRASE, "SRTO_PASSPHRASE", &s->passphrase, sizeof(s->passphrase)) < 0) ||
(s->mss >= 0 && libsrt_setsockopt(h, fd, SRTO_MSS, "SRTO_MMS", &s->mss, sizeof(s->mss)) < 0) ||
(s->ffs >= 0 && libsrt_setsockopt(h, fd, SRTO_FC, "SRTO_FC", &s->ffs, sizeof(s->ffs)) < 0) ||
(s->ipttl >= 0 && libsrt_setsockopt(h, fd, SRTO_IPTTL, "SRTO_UPTTL", &s->ipttl, sizeof(s->ipttl)) < 0) ||
(s->iptos >= 0 && libsrt_setsockopt(h, fd, SRTO_IPTOS, "SRTO_IPTOS", &s->iptos, sizeof(s->iptos)) < 0) ||
(tsbpddelay >= 0 && libsrt_setsockopt(h, fd, SRTO_TSBPDDELAY, "SRTO_TSBPDELAY", &tsbpddelay, sizeof(tsbpddelay)) < 0) ||
(s->tlpktdrop >= 0 && libsrt_setsockopt(h, fd, SRTO_TLPKTDROP, "SRTO_TLPKDROP", &s->tlpktdrop, sizeof(s->tlpktdrop)) < 0) ||
(s->nakreport >= 0 && libsrt_setsockopt(h, fd, SRTO_NAKREPORT, "SRTO_NAKREPORT", &s->nakreport, sizeof(s->nakreport)) < 0) ||
(connect_timeout >= 0 && libsrt_setsockopt(h, fd, SRTO_CONNTIMEO, "SRTO_CONNTIMEO", &connect_timeout, sizeof(connect_timeout)) < 0) ||
(s->payload_size >= 0 && libsrt_setsockopt(h, fd, SRTO_PAYLOADSIZE, "SRTO_PAYLOADSIZE", &s->payload_size, sizeof(s->payload_size)) < 0)) {
return AVERROR(EIO);
}
return 0;
}
static int libsrt_setup(URLContext *h, const char *uri, int flags)
{
struct addrinfo hints = { 0 }, *ai, *cur_ai;
int port, fd = -1;
SRTContext *s = h->priv_data;
const char *p;
char buf[256];
int ret;
char hostname[1024],proto[1024],path[1024];
char portstr[10];
int open_timeout = 5000000;
int eid;
eid = srt_epoll_create();
if (eid < 0)
return libsrt_neterrno(h);
s->eid = eid;
av_url_split(proto, sizeof(proto), NULL, 0, hostname, sizeof(hostname),
&port, path, sizeof(path), uri);
if (strcmp(proto, "srt"))
return AVERROR(EINVAL);
if (port <= 0 || port >= 65536) {
av_log(h, AV_LOG_ERROR, "Port missing in uri\n");
return AVERROR(EINVAL);
}
p = strchr(uri, '?');
if (p) {
if (av_find_info_tag(buf, sizeof(buf), "timeout", p)) {
s->rw_timeout = strtol(buf, NULL, 10);
}
if (av_find_info_tag(buf, sizeof(buf), "listen_timeout", p)) {
s->listen_timeout = strtol(buf, NULL, 10);
}
}
if (s->rw_timeout >= 0) {
open_timeout = h->rw_timeout = s->rw_timeout;
}
hints.ai_family = AF_UNSPEC;
hints.ai_socktype = SOCK_DGRAM;
snprintf(portstr, sizeof(portstr), "%d", port);
if (s->mode == SRT_MODE_LISTENER)
hints.ai_flags |= AI_PASSIVE;
ret = getaddrinfo(hostname[0] ? hostname : NULL, portstr, &hints, &ai);
if (ret) {
av_log(h, AV_LOG_ERROR,
"Failed to resolve hostname %s: %s\n",
hostname, gai_strerror(ret));
return AVERROR(EIO);
}
cur_ai = ai;
restart:
fd = srt_socket(cur_ai->ai_family, cur_ai->ai_socktype, 0);
if (fd < 0) {
ret = libsrt_neterrno(h);
goto fail;
}
if ((ret = libsrt_set_options_pre(h, fd)) < 0) {
goto fail;
}
/* Set the socket's send or receive buffer sizes, if specified.
If unspecified or setting fails, system default is used. */
if (s->recv_buffer_size > 0) {
srt_setsockopt(fd, SOL_SOCKET, SRTO_UDP_RCVBUF, &s->recv_buffer_size, sizeof (s->recv_buffer_size));
}
if (s->send_buffer_size > 0) {
srt_setsockopt(fd, SOL_SOCKET, SRTO_UDP_SNDBUF, &s->send_buffer_size, sizeof (s->send_buffer_size));
}
if (s->mode == SRT_MODE_LISTENER) {
// multi-client
if ((ret = libsrt_listen(s->eid, fd, cur_ai->ai_addr, cur_ai->ai_addrlen, h, open_timeout / 1000)) < 0)
goto fail1;
fd = ret;
} else {
if (s->mode == SRT_MODE_RENDEZVOUS) {
ret = srt_bind(fd, cur_ai->ai_addr, cur_ai->ai_addrlen);
if (ret)
goto fail1;
}
if ((ret = libsrt_listen_connect(s->eid, fd, cur_ai->ai_addr, cur_ai->ai_addrlen,
open_timeout / 1000, h, !!cur_ai->ai_next)) < 0) {
if (ret == AVERROR_EXIT)
goto fail1;
else
goto fail;
}
}
if ((ret = libsrt_set_options_post(h, fd)) < 0) {
goto fail;
}
h->is_streamed = 1;
s->fd = fd;
freeaddrinfo(ai);
return 0;
fail:
if (cur_ai->ai_next) {
/* Retry with the next sockaddr */
cur_ai = cur_ai->ai_next;
if (fd >= 0)
srt_close(fd);
ret = 0;
goto restart;
}
fail1:
if (fd >= 0)
srt_close(fd);
freeaddrinfo(ai);
return ret;
}
static int libsrt_open(URLContext *h, const char *uri, int flags)
{
SRTContext *s = h->priv_data;
const char * p;
char buf[256];
if (srt_startup() < 0) {
return AVERROR_UNKNOWN;
}
/* SRT options (srt/srt.h) */
p = strchr(uri, '?');
if (p) {
if (av_find_info_tag(buf, sizeof(buf), "maxbw", p)) {
s->maxbw = strtoll(buf, NULL, 0);
}
if (av_find_info_tag(buf, sizeof(buf), "pbkeylen", p)) {
s->pbkeylen = strtol(buf, NULL, 10);
}
if (av_find_info_tag(buf, sizeof(buf), "passphrase", p)) {
s->passphrase = av_strndup(buf, strlen(buf));
}
if (av_find_info_tag(buf, sizeof(buf), "mss", p)) {
s->mss = strtol(buf, NULL, 10);
}
if (av_find_info_tag(buf, sizeof(buf), "ffs", p)) {
s->ffs = strtol(buf, NULL, 10);
}
if (av_find_info_tag(buf, sizeof(buf), "ipttl", p)) {
s->ipttl = strtol(buf, NULL, 10);
}
if (av_find_info_tag(buf, sizeof(buf), "iptos", p)) {
s->iptos = strtol(buf, NULL, 10);
}
if (av_find_info_tag(buf, sizeof(buf), "inputbw", p)) {
s->inputbw = strtoll(buf, NULL, 10);
}
if (av_find_info_tag(buf, sizeof(buf), "oheadbw", p)) {
s->oheadbw = strtoll(buf, NULL, 10);
}
if (av_find_info_tag(buf, sizeof(buf), "tsbpddelay", p)) {
s->tsbpddelay = strtol(buf, NULL, 10);
}
if (av_find_info_tag(buf, sizeof(buf), "tlpktdrop", p)) {
s->tlpktdrop = strtol(buf, NULL, 10);
}
if (av_find_info_tag(buf, sizeof(buf), "nakreport", p)) {
s->nakreport = strtol(buf, NULL, 10);
}
if (av_find_info_tag(buf, sizeof(buf), "connect_timeout", p)) {
s->connect_timeout = strtol(buf, NULL, 10);
}
if (av_find_info_tag(buf, sizeof(buf), "payload_size", p)) {
s->payload_size = strtol(buf, NULL, 10);
}
if (av_find_info_tag(buf, sizeof(buf), "mode", p)) {
if (!strcmp(buf, "caller")) {
s->mode = SRT_MODE_CALLER;
} else if (!strcmp(buf, "listener")) {
s->mode = SRT_MODE_LISTENER;
} else if (!strcmp(buf, "rendezvous")) {
s->mode = SRT_MODE_RENDEZVOUS;
} else {
return AVERROR(EIO);
}
}
}
h->max_packet_size = s->payload_size > 0 ? s->payload_size : SRT_LIVE_DEFAULT_PAYLOAD_SIZE;
return libsrt_setup(h, uri, flags);
}
static int libsrt_read(URLContext *h, uint8_t *buf, int size)
{
SRTContext *s = h->priv_data;
int ret;
if (!(h->flags & AVIO_FLAG_NONBLOCK)) {
ret = libsrt_network_wait_fd_timeout(h, s->eid, s->fd, 0, h->rw_timeout, &h->interrupt_callback);
if (ret)
return ret;
}
ret = srt_recvmsg(s->fd, buf, size);
if (ret < 0) {
ret = libsrt_neterrno(h);
}
return ret;
}
static int libsrt_write(URLContext *h, const uint8_t *buf, int size)
{
SRTContext *s = h->priv_data;
int ret;
if (!(h->flags & AVIO_FLAG_NONBLOCK)) {
ret = libsrt_network_wait_fd_timeout(h, s->eid, s->fd, 1, h->rw_timeout, &h->interrupt_callback);
if (ret)
return ret;
}
ret = srt_sendmsg(s->fd, buf, size, -1, 0);
if (ret < 0) {
ret = libsrt_neterrno(h);
}
return ret;
}
static int libsrt_close(URLContext *h)
{
SRTContext *s = h->priv_data;
srt_close(s->fd);
srt_epoll_release(s->eid);
srt_cleanup();
return 0;
}
static int libsrt_get_file_handle(URLContext *h)
{
SRTContext *s = h->priv_data;
return s->fd;
}
static const AVClass libsrt_class = {
.class_name = "libsrt",
.item_name = av_default_item_name,
.option = libsrt_options,
.version = LIBAVUTIL_VERSION_INT,
};
const URLProtocol ff_libsrt_protocol = {
.name = "srt",
.url_open = libsrt_open,
.url_read = libsrt_read,
.url_write = libsrt_write,
.url_close = libsrt_close,
.url_get_file_handle = libsrt_get_file_handle,
.priv_data_size = sizeof(SRTContext),
.flags = URL_PROTOCOL_FLAG_NETWORK,
.priv_data_class = &libsrt_class,
};
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