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FFmpeg/libavformat/rtpproto.c
lemonlinger@gmail.com 2cf94485de avformat/rtpproto: when local rtp port and local rtcp port are not specified, try to make two successive ports and retry 3 times when failed
some video players on Android will not send udp hole punching messages if the rtcp port and rtp port are not two successive integers.
So, if the video player is behind NAT, it could not receive and rtp messages via udp

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
2013-10-25 22:40:21 +02:00

564 lines
18 KiB
C

/*
* RTP network protocol
* Copyright (c) 2002 Fabrice Bellard
*
* This file is part of FFmpeg.
*
* FFmpeg 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.
*
* FFmpeg 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 FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
* RTP protocol
*/
#include "libavutil/parseutils.h"
#include "libavutil/avstring.h"
#include "avformat.h"
#include "avio_internal.h"
#include "rtp.h"
#include "rtpproto.h"
#include "url.h"
#include <stdarg.h>
#include "internal.h"
#include "network.h"
#include "os_support.h"
#include <fcntl.h>
#if HAVE_POLL_H
#include <sys/poll.h>
#endif
typedef struct RTPContext {
URLContext *rtp_hd, *rtcp_hd;
int rtp_fd, rtcp_fd, nb_ssm_include_addrs, nb_ssm_exclude_addrs;
struct sockaddr_storage **ssm_include_addrs, **ssm_exclude_addrs;
int write_to_source;
struct sockaddr_storage last_rtp_source, last_rtcp_source;
socklen_t last_rtp_source_len, last_rtcp_source_len;
} RTPContext;
/**
* If no filename is given to av_open_input_file because you want to
* get the local port first, then you must call this function to set
* the remote server address.
*
* @param h media file context
* @param uri of the remote server
* @return zero if no error.
*/
int ff_rtp_set_remote_url(URLContext *h, const char *uri)
{
RTPContext *s = h->priv_data;
char hostname[256];
int port, rtcp_port;
const char *p;
char buf[1024];
char path[1024];
av_url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port,
path, sizeof(path), uri);
rtcp_port = port + 1;
p = strchr(uri, '?');
if (p) {
if (av_find_info_tag(buf, sizeof(buf), "rtcpport", p)) {
rtcp_port = strtol(buf, NULL, 10);
}
}
ff_url_join(buf, sizeof(buf), "udp", NULL, hostname, port, "%s", path);
ff_udp_set_remote_url(s->rtp_hd, buf);
ff_url_join(buf, sizeof(buf), "udp", NULL, hostname, rtcp_port, "%s", path);
ff_udp_set_remote_url(s->rtcp_hd, buf);
return 0;
}
static struct addrinfo* rtp_resolve_host(const char *hostname, int port,
int type, int family, int flags)
{
struct addrinfo hints = { 0 }, *res = 0;
int error;
char service[16];
snprintf(service, sizeof(service), "%d", port);
hints.ai_socktype = type;
hints.ai_family = family;
hints.ai_flags = flags;
if ((error = getaddrinfo(hostname, service, &hints, &res))) {
res = NULL;
av_log(NULL, AV_LOG_ERROR, "rtp_resolve_host: %s\n", gai_strerror(error));
}
return res;
}
static int compare_addr(const struct sockaddr_storage *a,
const struct sockaddr_storage *b)
{
if (a->ss_family != b->ss_family)
return 1;
if (a->ss_family == AF_INET) {
return (((const struct sockaddr_in *)a)->sin_addr.s_addr !=
((const struct sockaddr_in *)b)->sin_addr.s_addr);
}
#if HAVE_STRUCT_SOCKADDR_IN6
if (a->ss_family == AF_INET6) {
const uint8_t *s6_addr_a = ((const struct sockaddr_in6 *)a)->sin6_addr.s6_addr;
const uint8_t *s6_addr_b = ((const struct sockaddr_in6 *)b)->sin6_addr.s6_addr;
return memcmp(s6_addr_a, s6_addr_b, 16);
}
#endif
return 1;
}
static int get_port(const struct sockaddr_storage *ss)
{
if (ss->ss_family == AF_INET)
return ntohs(((const struct sockaddr_in *)ss)->sin_port);
#if HAVE_STRUCT_SOCKADDR_IN6
if (ss->ss_family == AF_INET6)
return ntohs(((const struct sockaddr_in6 *)ss)->sin6_port);
#endif
return 0;
}
static void set_port(struct sockaddr_storage *ss, int port)
{
if (ss->ss_family == AF_INET)
((struct sockaddr_in *)ss)->sin_port = htons(port);
#if HAVE_STRUCT_SOCKADDR_IN6
else if (ss->ss_family == AF_INET6)
((struct sockaddr_in6 *)ss)->sin6_port = htons(port);
#endif
}
static int rtp_check_source_lists(RTPContext *s, struct sockaddr_storage *source_addr_ptr)
{
int i;
if (s->nb_ssm_exclude_addrs) {
for (i = 0; i < s->nb_ssm_exclude_addrs; i++) {
if (!compare_addr(source_addr_ptr, s->ssm_exclude_addrs[i]))
return 1;
}
}
if (s->nb_ssm_include_addrs) {
for (i = 0; i < s->nb_ssm_include_addrs; i++) {
if (!compare_addr(source_addr_ptr, s->ssm_include_addrs[i]))
return 0;
}
return 1;
}
return 0;
}
/**
* add option to url of the form:
* "http://host:port/path?option1=val1&option2=val2...
*/
static av_printf_format(3, 4) void url_add_option(char *buf, int buf_size, const char *fmt, ...)
{
char buf1[1024];
va_list ap;
va_start(ap, fmt);
if (strchr(buf, '?'))
av_strlcat(buf, "&", buf_size);
else
av_strlcat(buf, "?", buf_size);
vsnprintf(buf1, sizeof(buf1), fmt, ap);
av_strlcat(buf, buf1, buf_size);
va_end(ap);
}
static void build_udp_url(char *buf, int buf_size,
const char *hostname, int port,
int local_port, int ttl,
int max_packet_size, int connect,
const char *include_sources,
const char *exclude_sources)
{
ff_url_join(buf, buf_size, "udp", NULL, hostname, port, NULL);
if (local_port >= 0)
url_add_option(buf, buf_size, "localport=%d", local_port);
if (ttl >= 0)
url_add_option(buf, buf_size, "ttl=%d", ttl);
if (max_packet_size >=0)
url_add_option(buf, buf_size, "pkt_size=%d", max_packet_size);
if (connect)
url_add_option(buf, buf_size, "connect=1");
url_add_option(buf, buf_size, "fifo_size=0");
if (include_sources && include_sources[0])
url_add_option(buf, buf_size, "sources=%s", include_sources);
if (exclude_sources && exclude_sources[0])
url_add_option(buf, buf_size, "block=%s", exclude_sources);
}
static void rtp_parse_addr_list(URLContext *h, char *buf,
struct sockaddr_storage ***address_list_ptr,
int *address_list_size_ptr)
{
struct addrinfo *ai = NULL;
struct sockaddr_storage *source_addr;
char tmp = '\0', *p = buf, *next;
/* Resolve all of the IPs */
while (p && p[0]) {
next = strchr(p, ',');
if (next) {
tmp = *next;
*next = '\0';
}
ai = rtp_resolve_host(p, 0, SOCK_DGRAM, AF_UNSPEC, 0);
if (ai) {
source_addr = av_mallocz(sizeof(struct sockaddr_storage));
if (!source_addr)
break;
memcpy(source_addr, ai->ai_addr, ai->ai_addrlen);
freeaddrinfo(ai);
dynarray_add(address_list_ptr, address_list_size_ptr, source_addr);
} else {
av_log(h, AV_LOG_WARNING, "Unable to resolve %s\n", p);
}
if (next) {
*next = tmp;
p = next + 1;
} else {
p = NULL;
}
}
}
/**
* url syntax: rtp://host:port[?option=val...]
* option: 'ttl=n' : set the ttl value (for multicast only)
* 'rtcpport=n' : set the remote rtcp port to n
* 'localrtpport=n' : set the local rtp port to n
* 'localrtcpport=n' : set the local rtcp port to n
* 'pkt_size=n' : set max packet size
* 'connect=0/1' : do a connect() on the UDP socket
* 'sources=ip[,ip]' : list allowed source IP addresses
* 'block=ip[,ip]' : list disallowed source IP addresses
* 'write_to_source=0/1' : send packets to the source address of the latest received packet
* deprecated option:
* 'localport=n' : set the local port to n
*
* if rtcpport isn't set the rtcp port will be the rtp port + 1
* if local rtp port isn't set any available port will be used for the local
* rtp and rtcp ports
* if the local rtcp port is not set it will be the local rtp port + 1
*/
static int rtp_open(URLContext *h, const char *uri, int flags)
{
RTPContext *s = h->priv_data;
int rtp_port, rtcp_port,
ttl, connect,
local_rtp_port, local_rtcp_port, max_packet_size;
char hostname[256], include_sources[1024] = "", exclude_sources[1024] = "";
char buf[1024];
char path[1024];
const char *p;
int i, max_retry_count = 3;
av_url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &rtp_port,
path, sizeof(path), uri);
/* extract parameters */
ttl = -1;
rtcp_port = rtp_port+1;
local_rtp_port = -1;
local_rtcp_port = -1;
max_packet_size = -1;
connect = 0;
p = strchr(uri, '?');
if (p) {
if (av_find_info_tag(buf, sizeof(buf), "ttl", p)) {
ttl = strtol(buf, NULL, 10);
}
if (av_find_info_tag(buf, sizeof(buf), "rtcpport", p)) {
rtcp_port = strtol(buf, NULL, 10);
}
if (av_find_info_tag(buf, sizeof(buf), "localport", p)) {
local_rtp_port = strtol(buf, NULL, 10);
}
if (av_find_info_tag(buf, sizeof(buf), "localrtpport", p)) {
local_rtp_port = strtol(buf, NULL, 10);
}
if (av_find_info_tag(buf, sizeof(buf), "localrtcpport", p)) {
local_rtcp_port = strtol(buf, NULL, 10);
}
if (av_find_info_tag(buf, sizeof(buf), "pkt_size", p)) {
max_packet_size = strtol(buf, NULL, 10);
}
if (av_find_info_tag(buf, sizeof(buf), "connect", p)) {
connect = strtol(buf, NULL, 10);
}
if (av_find_info_tag(buf, sizeof(buf), "write_to_source", p)) {
s->write_to_source = strtol(buf, NULL, 10);
}
if (av_find_info_tag(buf, sizeof(buf), "sources", p)) {
av_strlcpy(include_sources, buf, sizeof(include_sources));
rtp_parse_addr_list(h, buf, &s->ssm_include_addrs, &s->nb_ssm_include_addrs);
}
if (av_find_info_tag(buf, sizeof(buf), "block", p)) {
av_strlcpy(exclude_sources, buf, sizeof(exclude_sources));
rtp_parse_addr_list(h, buf, &s->ssm_exclude_addrs, &s->nb_ssm_exclude_addrs);
}
}
for (i = 0;i < max_retry_count;i++) {
build_udp_url(buf, sizeof(buf),
hostname, rtp_port, local_rtp_port, ttl, max_packet_size,
connect, include_sources, exclude_sources);
if (ffurl_open(&s->rtp_hd, buf, flags, &h->interrupt_callback, NULL) < 0)
goto fail;
local_rtp_port = ff_udp_get_local_port(s->rtp_hd);
if(local_rtp_port == 65535) {
local_rtp_port = -1;
continue;
}
if (local_rtcp_port<0) {
local_rtcp_port = local_rtp_port + 1;
build_udp_url(buf, sizeof(buf),
hostname, rtcp_port, local_rtcp_port, ttl, max_packet_size,
connect, include_sources, exclude_sources);
if (ffurl_open(&s->rtcp_hd, buf, flags, &h->interrupt_callback, NULL) < 0) {
local_rtp_port = local_rtcp_port = -1;
continue;
}
break;
}
build_udp_url(buf, sizeof(buf),
hostname, rtcp_port, local_rtcp_port, ttl, max_packet_size,
connect, include_sources, exclude_sources);
if (ffurl_open(&s->rtcp_hd, buf, flags, &h->interrupt_callback, NULL) < 0)
goto fail;
break;
}
/* just to ease handle access. XXX: need to suppress direct handle
access */
s->rtp_fd = ffurl_get_file_handle(s->rtp_hd);
s->rtcp_fd = ffurl_get_file_handle(s->rtcp_hd);
h->max_packet_size = s->rtp_hd->max_packet_size;
h->is_streamed = 1;
return 0;
fail:
if (s->rtp_hd)
ffurl_close(s->rtp_hd);
if (s->rtcp_hd)
ffurl_close(s->rtcp_hd);
return AVERROR(EIO);
}
static int rtp_read(URLContext *h, uint8_t *buf, int size)
{
RTPContext *s = h->priv_data;
int len, n, i;
struct pollfd p[2] = {{s->rtp_fd, POLLIN, 0}, {s->rtcp_fd, POLLIN, 0}};
int poll_delay = h->flags & AVIO_FLAG_NONBLOCK ? 0 : 100;
struct sockaddr_storage *addrs[2] = { &s->last_rtp_source, &s->last_rtcp_source };
socklen_t *addr_lens[2] = { &s->last_rtp_source_len, &s->last_rtcp_source_len };
for(;;) {
if (ff_check_interrupt(&h->interrupt_callback))
return AVERROR_EXIT;
n = poll(p, 2, poll_delay);
if (n > 0) {
/* first try RTCP, then RTP */
for (i = 1; i >= 0; i--) {
if (!(p[i].revents & POLLIN))
continue;
*addr_lens[i] = sizeof(*addrs[i]);
len = recvfrom(p[i].fd, buf, size, 0,
(struct sockaddr *)addrs[i], addr_lens[i]);
if (len < 0) {
if (ff_neterrno() == AVERROR(EAGAIN) ||
ff_neterrno() == AVERROR(EINTR))
continue;
return AVERROR(EIO);
}
if (rtp_check_source_lists(s, addrs[i]))
continue;
return len;
}
} else if (n < 0) {
if (ff_neterrno() == AVERROR(EINTR))
continue;
return AVERROR(EIO);
}
if (h->flags & AVIO_FLAG_NONBLOCK)
return AVERROR(EAGAIN);
}
return len;
}
static int rtp_write(URLContext *h, const uint8_t *buf, int size)
{
RTPContext *s = h->priv_data;
int ret;
URLContext *hd;
if (size < 2)
return AVERROR(EINVAL);
if (s->write_to_source) {
int fd;
struct sockaddr_storage *source, temp_source;
socklen_t *source_len, temp_len;
if (!s->last_rtp_source.ss_family && !s->last_rtcp_source.ss_family) {
av_log(h, AV_LOG_ERROR,
"Unable to send packet to source, no packets received yet\n");
// Intentionally not returning an error here
return size;
}
if (RTP_PT_IS_RTCP(buf[1])) {
fd = s->rtcp_fd;
source = &s->last_rtcp_source;
source_len = &s->last_rtcp_source_len;
} else {
fd = s->rtp_fd;
source = &s->last_rtp_source;
source_len = &s->last_rtp_source_len;
}
if (!source->ss_family) {
source = &temp_source;
source_len = &temp_len;
if (RTP_PT_IS_RTCP(buf[1])) {
temp_source = s->last_rtp_source;
temp_len = s->last_rtp_source_len;
set_port(source, get_port(source) + 1);
av_log(h, AV_LOG_INFO,
"Not received any RTCP packets yet, inferring peer port "
"from the RTP port\n");
} else {
temp_source = s->last_rtcp_source;
temp_len = s->last_rtcp_source_len;
set_port(source, get_port(source) - 1);
av_log(h, AV_LOG_INFO,
"Not received any RTP packets yet, inferring peer port "
"from the RTCP port\n");
}
}
if (!(h->flags & AVIO_FLAG_NONBLOCK)) {
ret = ff_network_wait_fd(fd, 1);
if (ret < 0)
return ret;
}
ret = sendto(fd, buf, size, 0, (struct sockaddr *) source,
*source_len);
return ret < 0 ? ff_neterrno() : ret;
}
if (RTP_PT_IS_RTCP(buf[1])) {
/* RTCP payload type */
hd = s->rtcp_hd;
} else {
/* RTP payload type */
hd = s->rtp_hd;
}
ret = ffurl_write(hd, buf, size);
return ret;
}
static int rtp_close(URLContext *h)
{
RTPContext *s = h->priv_data;
int i;
for (i = 0; i < s->nb_ssm_include_addrs; i++)
av_free(s->ssm_include_addrs[i]);
av_freep(&s->ssm_include_addrs);
for (i = 0; i < s->nb_ssm_exclude_addrs; i++)
av_free(s->ssm_exclude_addrs[i]);
av_freep(&s->ssm_exclude_addrs);
ffurl_close(s->rtp_hd);
ffurl_close(s->rtcp_hd);
return 0;
}
/**
* Return the local rtp port used by the RTP connection
* @param h media file context
* @return the local port number
*/
int ff_rtp_get_local_rtp_port(URLContext *h)
{
RTPContext *s = h->priv_data;
return ff_udp_get_local_port(s->rtp_hd);
}
/**
* Return the local rtcp port used by the RTP connection
* @param h media file context
* @return the local port number
*/
int ff_rtp_get_local_rtcp_port(URLContext *h)
{
RTPContext *s = h->priv_data;
return ff_udp_get_local_port(s->rtcp_hd);
}
static int rtp_get_file_handle(URLContext *h)
{
RTPContext *s = h->priv_data;
return s->rtp_fd;
}
static int rtp_get_multi_file_handle(URLContext *h, int **handles,
int *numhandles)
{
RTPContext *s = h->priv_data;
int *hs = *handles = av_malloc(sizeof(**handles) * 2);
if (!hs)
return AVERROR(ENOMEM);
hs[0] = s->rtp_fd;
hs[1] = s->rtcp_fd;
*numhandles = 2;
return 0;
}
URLProtocol ff_rtp_protocol = {
.name = "rtp",
.url_open = rtp_open,
.url_read = rtp_read,
.url_write = rtp_write,
.url_close = rtp_close,
.url_get_file_handle = rtp_get_file_handle,
.url_get_multi_file_handle = rtp_get_multi_file_handle,
.priv_data_size = sizeof(RTPContext),
.flags = URL_PROTOCOL_FLAG_NETWORK,
};