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ffmpeg/libavformat/udp.c
Stoian Ivanov 5fe415f0f4 UDP: join multicast group on the interface specified with &localaddr= 
When joining multicast groups, ffmpeg was using INADDR_ANY as interface address
which leads to enabling the multicast group on the interface with "default gateway".
Often multicast traffic is received over dedicated interface, which scenario ffmpeg was
unable to handle. With this patch, ffmpeg will enable multicast group to the interfaces
configured with address specified in &localaddr= parameter of udp:// URL. To avoid
loacal_addr resolve at udp_close(...) the UDPContext structure was extended with
struct sockaddr_storage local_addr_storage member, which is populated in udp_open(..)
and passed to udp_join_multicast_group()  and udp_leave_multicast_group().

Signed-off-by: Stoian Ivanov <s.ivanov@teracomm.bg>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
2013-12-17 01:14:28 +01:00

877 lines
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/*
* UDP prototype streaming system
* Copyright (c) 2000, 2001, 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
* UDP protocol
*/
#define _BSD_SOURCE /* Needed for using struct ip_mreq with recent glibc */
#include "avformat.h"
#include "avio_internal.h"
#include "libavutil/parseutils.h"
#include "libavutil/fifo.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/avstring.h"
#include "libavutil/opt.h"
#include "libavutil/log.h"
#include "libavutil/time.h"
#include "internal.h"
#include "network.h"
#include "os_support.h"
#include "url.h"
#if HAVE_PTHREAD_CANCEL
#include <pthread.h>
#endif
#ifndef HAVE_PTHREAD_CANCEL
#define HAVE_PTHREAD_CANCEL 0
#endif
#ifndef IPV6_ADD_MEMBERSHIP
#define IPV6_ADD_MEMBERSHIP IPV6_JOIN_GROUP
#define IPV6_DROP_MEMBERSHIP IPV6_LEAVE_GROUP
#endif
#define UDP_TX_BUF_SIZE 32768
#define UDP_MAX_PKT_SIZE 65536
typedef struct {
const AVClass *class;
int udp_fd;
int ttl;
int buffer_size;
int is_multicast;
int local_port;
int reuse_socket;
int overrun_nonfatal;
struct sockaddr_storage dest_addr;
int dest_addr_len;
int is_connected;
/* Circular Buffer variables for use in UDP receive code */
int circular_buffer_size;
AVFifoBuffer *fifo;
int circular_buffer_error;
#if HAVE_PTHREAD_CANCEL
pthread_t circular_buffer_thread;
pthread_mutex_t mutex;
pthread_cond_t cond;
int thread_started;
#endif
uint8_t tmp[UDP_MAX_PKT_SIZE+4];
int remaining_in_dg;
char *local_addr;
int packet_size;
int timeout;
struct sockaddr_storage local_addr_storage;
} UDPContext;
#define OFFSET(x) offsetof(UDPContext, x)
#define D AV_OPT_FLAG_DECODING_PARAM
#define E AV_OPT_FLAG_ENCODING_PARAM
static const AVOption options[] = {
{"buffer_size", "Socket buffer size in bytes", OFFSET(buffer_size), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, D|E },
{"localport", "Set local port to bind to", OFFSET(local_port), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, D|E },
{"localaddr", "Choose local IP address", OFFSET(local_addr), AV_OPT_TYPE_STRING, {.str = ""}, 0, 0, D|E },
{"pkt_size", "Set size of UDP packets", OFFSET(packet_size), AV_OPT_TYPE_INT, {.i64 = 1472}, 0, INT_MAX, D|E },
{"reuse", "Explicitly allow or disallow reusing UDP sockets", OFFSET(reuse_socket), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, D|E },
{"ttl", "Set the time to live value (for multicast only)", OFFSET(ttl), AV_OPT_TYPE_INT, {.i64 = 16}, 0, INT_MAX, E },
{"connect", "Should connect() be called on socket", OFFSET(is_connected), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, D|E },
/* TODO 'sources', 'block' option */
{"fifo_size", "Set the UDP receiving circular buffer size, expressed as a number of packets with size of 188 bytes", OFFSET(circular_buffer_size), AV_OPT_TYPE_INT, {.i64 = 7*4096}, 0, INT_MAX, D },
{"overrun_nonfatal", "Survive in case of UDP receiving circular buffer overrun", OFFSET(overrun_nonfatal), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, D },
{"timeout", "In read mode: if no data arrived in more than this time interval, raise error", OFFSET(timeout), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, D },
{NULL}
};
static const AVClass udp_context_class = {
.class_name = "udp",
.item_name = av_default_item_name,
.option = options,
.version = LIBAVUTIL_VERSION_INT,
};
static void log_net_error(void *ctx, int level, const char* prefix)
{
char errbuf[100];
av_strerror(ff_neterrno(), errbuf, sizeof(errbuf));
av_log(ctx, level, "%s: %s\n", prefix, errbuf);
}
static int udp_set_multicast_ttl(int sockfd, int mcastTTL,
struct sockaddr *addr)
{
#ifdef IP_MULTICAST_TTL
if (addr->sa_family == AF_INET) {
if (setsockopt(sockfd, IPPROTO_IP, IP_MULTICAST_TTL, &mcastTTL, sizeof(mcastTTL)) < 0) {
log_net_error(NULL, AV_LOG_ERROR, "setsockopt(IP_MULTICAST_TTL)");
return -1;
}
}
#endif
#if defined(IPPROTO_IPV6) && defined(IPV6_MULTICAST_HOPS)
if (addr->sa_family == AF_INET6) {
if (setsockopt(sockfd, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, &mcastTTL, sizeof(mcastTTL)) < 0) {
log_net_error(NULL, AV_LOG_ERROR, "setsockopt(IPV6_MULTICAST_HOPS)");
return -1;
}
}
#endif
return 0;
}
static int udp_join_multicast_group(int sockfd, struct sockaddr *addr,struct sockaddr *local_addr)
{
#ifdef IP_ADD_MEMBERSHIP
if (addr->sa_family == AF_INET) {
struct ip_mreq mreq;
mreq.imr_multiaddr.s_addr = ((struct sockaddr_in *)addr)->sin_addr.s_addr;
if (local_addr)
mreq.imr_interface= ((struct sockaddr_in *)local_addr)->sin_addr;
else
mreq.imr_interface.s_addr= INADDR_ANY;
if (setsockopt(sockfd, IPPROTO_IP, IP_ADD_MEMBERSHIP, (const void *)&mreq, sizeof(mreq)) < 0) {
log_net_error(NULL, AV_LOG_ERROR, "setsockopt(IP_ADD_MEMBERSHIP)");
return -1;
}
}
#endif
#if HAVE_STRUCT_IPV6_MREQ && defined(IPPROTO_IPV6)
if (addr->sa_family == AF_INET6) {
struct ipv6_mreq mreq6;
memcpy(&mreq6.ipv6mr_multiaddr, &(((struct sockaddr_in6 *)addr)->sin6_addr), sizeof(struct in6_addr));
mreq6.ipv6mr_interface= 0;
if (setsockopt(sockfd, IPPROTO_IPV6, IPV6_ADD_MEMBERSHIP, &mreq6, sizeof(mreq6)) < 0) {
log_net_error(NULL, AV_LOG_ERROR, "setsockopt(IPV6_ADD_MEMBERSHIP)");
return -1;
}
}
#endif
return 0;
}
static int udp_leave_multicast_group(int sockfd, struct sockaddr *addr,struct sockaddr *local_addr)
{
#ifdef IP_DROP_MEMBERSHIP
if (addr->sa_family == AF_INET) {
struct ip_mreq mreq;
mreq.imr_multiaddr.s_addr = ((struct sockaddr_in *)addr)->sin_addr.s_addr;
if (local_addr)
mreq.imr_interface= ((struct sockaddr_in *)local_addr)->sin_addr;
else
mreq.imr_interface.s_addr= INADDR_ANY;
if (setsockopt(sockfd, IPPROTO_IP, IP_DROP_MEMBERSHIP, (const void *)&mreq, sizeof(mreq)) < 0) {
log_net_error(NULL, AV_LOG_ERROR, "setsockopt(IP_DROP_MEMBERSHIP)");
return -1;
}
}
#endif
#if HAVE_STRUCT_IPV6_MREQ && defined(IPPROTO_IPV6)
if (addr->sa_family == AF_INET6) {
struct ipv6_mreq mreq6;
memcpy(&mreq6.ipv6mr_multiaddr, &(((struct sockaddr_in6 *)addr)->sin6_addr), sizeof(struct in6_addr));
mreq6.ipv6mr_interface= 0;
if (setsockopt(sockfd, IPPROTO_IPV6, IPV6_DROP_MEMBERSHIP, &mreq6, sizeof(mreq6)) < 0) {
log_net_error(NULL, AV_LOG_ERROR, "setsockopt(IPV6_DROP_MEMBERSHIP)");
return -1;
}
}
#endif
return 0;
}
static struct addrinfo* udp_resolve_host(const char *hostname, int port,
int type, int family, int flags)
{
struct addrinfo hints = { 0 }, *res = 0;
int error;
char sport[16];
const char *node = 0, *service = "0";
if (port > 0) {
snprintf(sport, sizeof(sport), "%d", port);
service = sport;
}
if ((hostname) && (hostname[0] != '\0') && (hostname[0] != '?')) {
node = hostname;
}
hints.ai_socktype = type;
hints.ai_family = family;
hints.ai_flags = flags;
if ((error = getaddrinfo(node, service, &hints, &res))) {
res = NULL;
av_log(NULL, AV_LOG_ERROR, "udp_resolve_host: %s\n", gai_strerror(error));
}
return res;
}
static int udp_set_multicast_sources(int sockfd, struct sockaddr *addr,
int addr_len, char **sources,
int nb_sources, int include)
{
#if HAVE_STRUCT_GROUP_SOURCE_REQ && defined(MCAST_BLOCK_SOURCE) && !defined(_WIN32)
/* These ones are available in the microsoft SDK, but don't seem to work
* as on linux, so just prefer the v4-only approach there for now. */
int i;
for (i = 0; i < nb_sources; i++) {
struct group_source_req mreqs;
int level = addr->sa_family == AF_INET ? IPPROTO_IP : IPPROTO_IPV6;
struct addrinfo *sourceaddr = udp_resolve_host(sources[i], 0,
SOCK_DGRAM, AF_UNSPEC,
0);
if (!sourceaddr)
return AVERROR(ENOENT);
mreqs.gsr_interface = 0;
memcpy(&mreqs.gsr_group, addr, addr_len);
memcpy(&mreqs.gsr_source, sourceaddr->ai_addr, sourceaddr->ai_addrlen);
freeaddrinfo(sourceaddr);
if (setsockopt(sockfd, level,
include ? MCAST_JOIN_SOURCE_GROUP : MCAST_BLOCK_SOURCE,
(const void *)&mreqs, sizeof(mreqs)) < 0) {
if (include)
log_net_error(NULL, AV_LOG_ERROR, "setsockopt(MCAST_JOIN_SOURCE_GROUP)");
else
log_net_error(NULL, AV_LOG_ERROR, "setsockopt(MCAST_BLOCK_SOURCE)");
return ff_neterrno();
}
}
#elif HAVE_STRUCT_IP_MREQ_SOURCE && defined(IP_BLOCK_SOURCE)
int i;
if (addr->sa_family != AF_INET) {
av_log(NULL, AV_LOG_ERROR,
"Setting multicast sources only supported for IPv4\n");
return AVERROR(EINVAL);
}
for (i = 0; i < nb_sources; i++) {
struct ip_mreq_source mreqs;
struct addrinfo *sourceaddr = udp_resolve_host(sources[i], 0,
SOCK_DGRAM, AF_UNSPEC,
0);
if (!sourceaddr)
return AVERROR(ENOENT);
if (sourceaddr->ai_addr->sa_family != AF_INET) {
freeaddrinfo(sourceaddr);
av_log(NULL, AV_LOG_ERROR, "%s is of incorrect protocol family\n",
sources[i]);
return AVERROR(EINVAL);
}
mreqs.imr_multiaddr.s_addr = ((struct sockaddr_in *)addr)->sin_addr.s_addr;
mreqs.imr_interface.s_addr = INADDR_ANY;
mreqs.imr_sourceaddr.s_addr = ((struct sockaddr_in *)sourceaddr->ai_addr)->sin_addr.s_addr;
freeaddrinfo(sourceaddr);
if (setsockopt(sockfd, IPPROTO_IP,
include ? IP_ADD_SOURCE_MEMBERSHIP : IP_BLOCK_SOURCE,
(const void *)&mreqs, sizeof(mreqs)) < 0) {
if (include)
log_net_error(NULL, AV_LOG_ERROR, "setsockopt(IP_ADD_SOURCE_MEMBERSHIP)");
else
log_net_error(NULL, AV_LOG_ERROR, "setsockopt(IP_BLOCK_SOURCE)");
return ff_neterrno();
}
}
#else
return AVERROR(ENOSYS);
#endif
return 0;
}
static int udp_set_url(struct sockaddr_storage *addr,
const char *hostname, int port)
{
struct addrinfo *res0;
int addr_len;
res0 = udp_resolve_host(hostname, port, SOCK_DGRAM, AF_UNSPEC, 0);
if (res0 == 0) return AVERROR(EIO);
memcpy(addr, res0->ai_addr, res0->ai_addrlen);
addr_len = res0->ai_addrlen;
freeaddrinfo(res0);
return addr_len;
}
static int udp_socket_create(UDPContext *s, struct sockaddr_storage *addr,
socklen_t *addr_len, const char *localaddr)
{
int udp_fd = -1;
struct addrinfo *res0 = NULL, *res = NULL;
int family = AF_UNSPEC;
if (((struct sockaddr *) &s->dest_addr)->sa_family)
family = ((struct sockaddr *) &s->dest_addr)->sa_family;
res0 = udp_resolve_host(localaddr[0] ? localaddr : NULL, s->local_port,
SOCK_DGRAM, family, AI_PASSIVE);
if (res0 == 0)
goto fail;
for (res = res0; res; res=res->ai_next) {
udp_fd = ff_socket(res->ai_family, SOCK_DGRAM, 0);
if (udp_fd != -1) break;
log_net_error(NULL, AV_LOG_ERROR, "socket");
}
if (udp_fd < 0)
goto fail;
memcpy(addr, res->ai_addr, res->ai_addrlen);
*addr_len = res->ai_addrlen;
freeaddrinfo(res0);
return udp_fd;
fail:
if (udp_fd >= 0)
closesocket(udp_fd);
if(res0)
freeaddrinfo(res0);
return -1;
}
static int udp_port(struct sockaddr_storage *addr, int addr_len)
{
char sbuf[sizeof(int)*3+1];
int error;
if ((error = getnameinfo((struct sockaddr *)addr, addr_len, NULL, 0, sbuf, sizeof(sbuf), NI_NUMERICSERV)) != 0) {
av_log(NULL, AV_LOG_ERROR, "getnameinfo: %s\n", gai_strerror(error));
return -1;
}
return strtol(sbuf, NULL, 10);
}
/**
* 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.
*
* url syntax: udp://host:port[?option=val...]
* option: 'ttl=n' : set the ttl value (for multicast only)
* 'localport=n' : set the local port
* 'pkt_size=n' : set max packet size
* 'reuse=1' : enable reusing the socket
* 'overrun_nonfatal=1': survive in case of circular buffer overrun
*
* @param h media file context
* @param uri of the remote server
* @return zero if no error.
*/
int ff_udp_set_remote_url(URLContext *h, const char *uri)
{
UDPContext *s = h->priv_data;
char hostname[256], buf[10];
int port;
const char *p;
av_url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port, NULL, 0, uri);
/* set the destination address */
s->dest_addr_len = udp_set_url(&s->dest_addr, hostname, port);
if (s->dest_addr_len < 0) {
return AVERROR(EIO);
}
s->is_multicast = ff_is_multicast_address((struct sockaddr*) &s->dest_addr);
p = strchr(uri, '?');
if (p) {
if (av_find_info_tag(buf, sizeof(buf), "connect", p)) {
int was_connected = s->is_connected;
s->is_connected = strtol(buf, NULL, 10);
if (s->is_connected && !was_connected) {
if (connect(s->udp_fd, (struct sockaddr *) &s->dest_addr,
s->dest_addr_len)) {
s->is_connected = 0;
log_net_error(h, AV_LOG_ERROR, "connect");
return AVERROR(EIO);
}
}
}
}
return 0;
}
/**
* Return the local port used by the UDP connection
* @param h media file context
* @return the local port number
*/
int ff_udp_get_local_port(URLContext *h)
{
UDPContext *s = h->priv_data;
return s->local_port;
}
/**
* Return the udp file handle for select() usage to wait for several RTP
* streams at the same time.
* @param h media file context
*/
static int udp_get_file_handle(URLContext *h)
{
UDPContext *s = h->priv_data;
return s->udp_fd;
}
#if HAVE_PTHREAD_CANCEL
static void *circular_buffer_task( void *_URLContext)
{
URLContext *h = _URLContext;
UDPContext *s = h->priv_data;
int old_cancelstate;
pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &old_cancelstate);
pthread_mutex_lock(&s->mutex);
if (ff_socket_nonblock(s->udp_fd, 0) < 0) {
av_log(h, AV_LOG_ERROR, "Failed to set blocking mode");
s->circular_buffer_error = AVERROR(EIO);
goto end;
}
while(1) {
int len;
pthread_mutex_unlock(&s->mutex);
/* Blocking operations are always cancellation points;
see "General Information" / "Thread Cancelation Overview"
in Single Unix. */
pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, &old_cancelstate);
len = recv(s->udp_fd, s->tmp+4, sizeof(s->tmp)-4, 0);
pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &old_cancelstate);
pthread_mutex_lock(&s->mutex);
if (len < 0) {
if (ff_neterrno() != AVERROR(EAGAIN) && ff_neterrno() != AVERROR(EINTR)) {
s->circular_buffer_error = ff_neterrno();
goto end;
}
continue;
}
AV_WL32(s->tmp, len);
if(av_fifo_space(s->fifo) < len + 4) {
/* No Space left */
if (s->overrun_nonfatal) {
av_log(h, AV_LOG_WARNING, "Circular buffer overrun. "
"Surviving due to overrun_nonfatal option\n");
continue;
} else {
av_log(h, AV_LOG_ERROR, "Circular buffer overrun. "
"To avoid, increase fifo_size URL option. "
"To survive in such case, use overrun_nonfatal option\n");
s->circular_buffer_error = AVERROR(EIO);
goto end;
}
}
av_fifo_generic_write(s->fifo, s->tmp, len+4, NULL);
pthread_cond_signal(&s->cond);
}
end:
pthread_cond_signal(&s->cond);
pthread_mutex_unlock(&s->mutex);
return NULL;
}
#endif
static int parse_source_list(char *buf, char **sources, int *num_sources,
int max_sources)
{
char *source_start;
source_start = buf;
while (1) {
char *next = strchr(source_start, ',');
if (next)
*next = '\0';
sources[*num_sources] = av_strdup(source_start);
if (!sources[*num_sources])
return AVERROR(ENOMEM);
source_start = next + 1;
(*num_sources)++;
if (*num_sources >= max_sources || !next)
break;
}
return 0;
}
/* put it in UDP context */
/* return non zero if error */
static int udp_open(URLContext *h, const char *uri, int flags)
{
char hostname[1024], localaddr[1024] = "";
int port, udp_fd = -1, tmp, bind_ret = -1;
UDPContext *s = h->priv_data;
int is_output;
const char *p;
char buf[256];
struct sockaddr_storage my_addr;
socklen_t len;
int reuse_specified = 0;
int i, num_include_sources = 0, num_exclude_sources = 0;
char *include_sources[32], *exclude_sources[32];
h->is_streamed = 1;
is_output = !(flags & AVIO_FLAG_READ);
if (!s->buffer_size) /* if not set explicitly */
s->buffer_size = is_output ? UDP_TX_BUF_SIZE : UDP_MAX_PKT_SIZE;
p = strchr(uri, '?');
if (p) {
if (av_find_info_tag(buf, sizeof(buf), "reuse", p)) {
char *endptr = NULL;
s->reuse_socket = strtol(buf, &endptr, 10);
/* assume if no digits were found it is a request to enable it */
if (buf == endptr)
s->reuse_socket = 1;
reuse_specified = 1;
}
if (av_find_info_tag(buf, sizeof(buf), "overrun_nonfatal", p)) {
char *endptr = NULL;
s->overrun_nonfatal = strtol(buf, &endptr, 10);
/* assume if no digits were found it is a request to enable it */
if (buf == endptr)
s->overrun_nonfatal = 1;
if (!HAVE_PTHREAD_CANCEL)
av_log(h, AV_LOG_WARNING,
"'overrun_nonfatal' option was set but it is not supported "
"on this build (pthread support is required)\n");
}
if (av_find_info_tag(buf, sizeof(buf), "ttl", p)) {
s->ttl = strtol(buf, NULL, 10);
}
if (av_find_info_tag(buf, sizeof(buf), "localport", p)) {
s->local_port = strtol(buf, NULL, 10);
}
if (av_find_info_tag(buf, sizeof(buf), "pkt_size", p)) {
s->packet_size = strtol(buf, NULL, 10);
}
if (av_find_info_tag(buf, sizeof(buf), "buffer_size", p)) {
s->buffer_size = strtol(buf, NULL, 10);
}
if (av_find_info_tag(buf, sizeof(buf), "connect", p)) {
s->is_connected = strtol(buf, NULL, 10);
}
if (av_find_info_tag(buf, sizeof(buf), "fifo_size", p)) {
s->circular_buffer_size = strtol(buf, NULL, 10);
if (!HAVE_PTHREAD_CANCEL)
av_log(h, AV_LOG_WARNING,
"'circular_buffer_size' option was set but it is not supported "
"on this build (pthread support is required)\n");
}
if (av_find_info_tag(buf, sizeof(buf), "localaddr", p)) {
av_strlcpy(localaddr, buf, sizeof(localaddr));
}
if (av_find_info_tag(buf, sizeof(buf), "sources", p)) {
if (parse_source_list(buf, include_sources, &num_include_sources,
FF_ARRAY_ELEMS(include_sources)))
goto fail;
}
if (av_find_info_tag(buf, sizeof(buf), "block", p)) {
if (parse_source_list(buf, exclude_sources, &num_exclude_sources,
FF_ARRAY_ELEMS(exclude_sources)))
goto fail;
}
if (!is_output && av_find_info_tag(buf, sizeof(buf), "timeout", p))
s->timeout = strtol(buf, NULL, 10);
}
/* handling needed to support options picking from both AVOption and URL */
s->circular_buffer_size *= 188;
if (flags & AVIO_FLAG_WRITE) {
h->max_packet_size = s->packet_size;
} else {
h->max_packet_size = UDP_MAX_PKT_SIZE;
}
h->rw_timeout = s->timeout;
/* fill the dest addr */
av_url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port, NULL, 0, uri);
/* XXX: fix av_url_split */
if (hostname[0] == '\0' || hostname[0] == '?') {
/* only accepts null hostname if input */
if (!(flags & AVIO_FLAG_READ))
goto fail;
} else {
if (ff_udp_set_remote_url(h, uri) < 0)
goto fail;
}
if ((s->is_multicast || !s->local_port) && (h->flags & AVIO_FLAG_READ))
s->local_port = port;
udp_fd = udp_socket_create(s, &my_addr, &len, localaddr[0] ? localaddr : s->local_addr);
if (udp_fd < 0)
goto fail;
s->local_addr_storage=my_addr; //store for future multicast join
/* Follow the requested reuse option, unless it's multicast in which
* case enable reuse unless explicitly disabled.
*/
if (s->reuse_socket || (s->is_multicast && !reuse_specified)) {
s->reuse_socket = 1;
if (setsockopt (udp_fd, SOL_SOCKET, SO_REUSEADDR, &(s->reuse_socket), sizeof(s->reuse_socket)) != 0)
goto fail;
}
/* If multicast, try binding the multicast address first, to avoid
* receiving UDP packets from other sources aimed at the same UDP
* port. This fails on windows. This makes sending to the same address
* using sendto() fail, so only do it if we're opened in read-only mode. */
if (s->is_multicast && !(h->flags & AVIO_FLAG_WRITE)) {
bind_ret = bind(udp_fd,(struct sockaddr *)&s->dest_addr, len);
}
/* bind to the local address if not multicast or if the multicast
* bind failed */
/* the bind is needed to give a port to the socket now */
if (bind_ret < 0 && bind(udp_fd,(struct sockaddr *)&my_addr, len) < 0) {
log_net_error(h, AV_LOG_ERROR, "bind failed");
goto fail;
}
len = sizeof(my_addr);
getsockname(udp_fd, (struct sockaddr *)&my_addr, &len);
s->local_port = udp_port(&my_addr, len);
if (s->is_multicast) {
if (h->flags & AVIO_FLAG_WRITE) {
/* output */
if (udp_set_multicast_ttl(udp_fd, s->ttl, (struct sockaddr *)&s->dest_addr) < 0)
goto fail;
}
if (h->flags & AVIO_FLAG_READ) {
/* input */
if (num_include_sources && num_exclude_sources) {
av_log(h, AV_LOG_ERROR, "Simultaneously including and excluding multicast sources is not supported\n");
goto fail;
}
if (num_include_sources) {
if (udp_set_multicast_sources(udp_fd, (struct sockaddr *)&s->dest_addr, s->dest_addr_len, include_sources, num_include_sources, 1) < 0)
goto fail;
} else {
if (udp_join_multicast_group(udp_fd, (struct sockaddr *)&s->dest_addr,(struct sockaddr *)&s->local_addr_storage) < 0)
goto fail;
}
if (num_exclude_sources) {
if (udp_set_multicast_sources(udp_fd, (struct sockaddr *)&s->dest_addr, s->dest_addr_len, exclude_sources, num_exclude_sources, 0) < 0)
goto fail;
}
}
}
if (is_output) {
/* limit the tx buf size to limit latency */
tmp = s->buffer_size;
if (setsockopt(udp_fd, SOL_SOCKET, SO_SNDBUF, &tmp, sizeof(tmp)) < 0) {
log_net_error(h, AV_LOG_ERROR, "setsockopt(SO_SNDBUF)");
goto fail;
}
} else {
/* set udp recv buffer size to the largest possible udp packet size to
* avoid losing data on OSes that set this too low by default. */
tmp = s->buffer_size;
if (setsockopt(udp_fd, SOL_SOCKET, SO_RCVBUF, &tmp, sizeof(tmp)) < 0) {
log_net_error(h, AV_LOG_WARNING, "setsockopt(SO_RECVBUF)");
}
/* make the socket non-blocking */
ff_socket_nonblock(udp_fd, 1);
}
if (s->is_connected) {
if (connect(udp_fd, (struct sockaddr *) &s->dest_addr, s->dest_addr_len)) {
log_net_error(h, AV_LOG_ERROR, "connect");
goto fail;
}
}
for (i = 0; i < num_include_sources; i++)
av_freep(&include_sources[i]);
for (i = 0; i < num_exclude_sources; i++)
av_freep(&exclude_sources[i]);
s->udp_fd = udp_fd;
#if HAVE_PTHREAD_CANCEL
if (!is_output && s->circular_buffer_size) {
int ret;
/* start the task going */
s->fifo = av_fifo_alloc(s->circular_buffer_size);
ret = pthread_mutex_init(&s->mutex, NULL);
if (ret != 0) {
av_log(h, AV_LOG_ERROR, "pthread_mutex_init failed : %s\n", strerror(ret));
goto fail;
}
ret = pthread_cond_init(&s->cond, NULL);
if (ret != 0) {
av_log(h, AV_LOG_ERROR, "pthread_cond_init failed : %s\n", strerror(ret));
goto cond_fail;
}
ret = pthread_create(&s->circular_buffer_thread, NULL, circular_buffer_task, h);
if (ret != 0) {
av_log(h, AV_LOG_ERROR, "pthread_create failed : %s\n", strerror(ret));
goto thread_fail;
}
s->thread_started = 1;
}
#endif
return 0;
#if HAVE_PTHREAD_CANCEL
thread_fail:
pthread_cond_destroy(&s->cond);
cond_fail:
pthread_mutex_destroy(&s->mutex);
#endif
fail:
if (udp_fd >= 0)
closesocket(udp_fd);
av_fifo_free(s->fifo);
for (i = 0; i < num_include_sources; i++)
av_freep(&include_sources[i]);
for (i = 0; i < num_exclude_sources; i++)
av_freep(&exclude_sources[i]);
return AVERROR(EIO);
}
static int udp_read(URLContext *h, uint8_t *buf, int size)
{
UDPContext *s = h->priv_data;
int ret;
int avail, nonblock = h->flags & AVIO_FLAG_NONBLOCK;
#if HAVE_PTHREAD_CANCEL
if (s->fifo) {
pthread_mutex_lock(&s->mutex);
do {
avail = av_fifo_size(s->fifo);
if (avail) { // >=size) {
uint8_t tmp[4];
av_fifo_generic_read(s->fifo, tmp, 4, NULL);
avail= AV_RL32(tmp);
if(avail > size){
av_log(h, AV_LOG_WARNING, "Part of datagram lost due to insufficient buffer size\n");
avail= size;
}
av_fifo_generic_read(s->fifo, buf, avail, NULL);
av_fifo_drain(s->fifo, AV_RL32(tmp) - avail);
pthread_mutex_unlock(&s->mutex);
return avail;
} else if(s->circular_buffer_error){
int err = s->circular_buffer_error;
pthread_mutex_unlock(&s->mutex);
return err;
} else if(nonblock) {
pthread_mutex_unlock(&s->mutex);
return AVERROR(EAGAIN);
}
else {
/* FIXME: using the monotonic clock would be better,
but it does not exist on all supported platforms. */
int64_t t = av_gettime() + 100000;
struct timespec tv = { .tv_sec = t / 1000000,
.tv_nsec = (t % 1000000) * 1000 };
if (pthread_cond_timedwait(&s->cond, &s->mutex, &tv) < 0) {
pthread_mutex_unlock(&s->mutex);
return AVERROR(errno == ETIMEDOUT ? EAGAIN : errno);
}
nonblock = 1;
}
} while( 1);
}
#endif
if (!(h->flags & AVIO_FLAG_NONBLOCK)) {
ret = ff_network_wait_fd(s->udp_fd, 0);
if (ret < 0)
return ret;
}
ret = recv(s->udp_fd, buf, size, 0);
return ret < 0 ? ff_neterrno() : ret;
}
static int udp_write(URLContext *h, const uint8_t *buf, int size)
{
UDPContext *s = h->priv_data;
int ret;
if (!(h->flags & AVIO_FLAG_NONBLOCK)) {
ret = ff_network_wait_fd(s->udp_fd, 1);
if (ret < 0)
return ret;
}
if (!s->is_connected) {
ret = sendto (s->udp_fd, buf, size, 0,
(struct sockaddr *) &s->dest_addr,
s->dest_addr_len);
} else
ret = send(s->udp_fd, buf, size, 0);
return ret < 0 ? ff_neterrno() : ret;
}
static int udp_close(URLContext *h)
{
UDPContext *s = h->priv_data;
int ret;
if (s->is_multicast && (h->flags & AVIO_FLAG_READ))
udp_leave_multicast_group(s->udp_fd, (struct sockaddr *)&s->dest_addr,(struct sockaddr *)&s->local_addr_storage);
closesocket(s->udp_fd);
#if HAVE_PTHREAD_CANCEL
if (s->thread_started) {
pthread_cancel(s->circular_buffer_thread);
ret = pthread_join(s->circular_buffer_thread, NULL);
if (ret != 0)
av_log(h, AV_LOG_ERROR, "pthread_join(): %s\n", strerror(ret));
pthread_mutex_destroy(&s->mutex);
pthread_cond_destroy(&s->cond);
}
#endif
av_fifo_free(s->fifo);
return 0;
}
URLProtocol ff_udp_protocol = {
.name = "udp",
.url_open = udp_open,
.url_read = udp_read,
.url_write = udp_write,
.url_close = udp_close,
.url_get_file_handle = udp_get_file_handle,
.priv_data_size = sizeof(UDPContext),
.priv_data_class = &udp_context_class,
.flags = URL_PROTOCOL_FLAG_NETWORK,
};
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