ffmpeg / libavformat / udp.c @ a7ea5e3d
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/*
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* UDP prototype streaming system
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* Copyright (c) 2000, 2001, 2002 Fabrice Bellard
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*
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* This file is part of Libav.
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*
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* Libav is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* Libav is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with Libav; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* UDP protocol
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*/
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#define _BSD_SOURCE /* Needed for using struct ip_mreq with recent glibc */ |
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#define _DARWIN_C_SOURCE /* Needed for using IP_MULTICAST_TTL on OS X */ |
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#include "avformat.h" |
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#include "avio_internal.h" |
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#include "libavutil/parseutils.h" |
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#include <unistd.h> |
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#include "internal.h" |
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#include "network.h" |
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#include "os_support.h" |
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#include "url.h" |
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#include <sys/time.h> |
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#ifndef IPV6_ADD_MEMBERSHIP
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#define IPV6_ADD_MEMBERSHIP IPV6_JOIN_GROUP
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#define IPV6_DROP_MEMBERSHIP IPV6_LEAVE_GROUP
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#endif
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typedef struct { |
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int udp_fd;
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int ttl;
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int buffer_size;
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int is_multicast;
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int local_port;
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int reuse_socket;
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struct sockaddr_storage dest_addr;
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int dest_addr_len;
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int is_connected;
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} UDPContext; |
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#define UDP_TX_BUF_SIZE 32768 |
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#define UDP_MAX_PKT_SIZE 65536 |
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static int udp_set_multicast_ttl(int sockfd, int mcastTTL, |
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struct sockaddr *addr)
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{ |
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#ifdef IP_MULTICAST_TTL
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if (addr->sa_family == AF_INET) {
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if (setsockopt(sockfd, IPPROTO_IP, IP_MULTICAST_TTL, &mcastTTL, sizeof(mcastTTL)) < 0) { |
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av_log(NULL, AV_LOG_ERROR, "setsockopt(IP_MULTICAST_TTL): %s\n", strerror(errno)); |
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return -1; |
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} |
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} |
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#endif
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#if defined(IPPROTO_IPV6) && defined(IPV6_MULTICAST_HOPS)
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if (addr->sa_family == AF_INET6) {
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if (setsockopt(sockfd, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, &mcastTTL, sizeof(mcastTTL)) < 0) { |
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av_log(NULL, AV_LOG_ERROR, "setsockopt(IPV6_MULTICAST_HOPS): %s\n", strerror(errno)); |
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return -1; |
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} |
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} |
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#endif
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return 0; |
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} |
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static int udp_join_multicast_group(int sockfd, struct sockaddr *addr) |
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{ |
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#ifdef IP_ADD_MEMBERSHIP
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if (addr->sa_family == AF_INET) {
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struct ip_mreq mreq;
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mreq.imr_multiaddr.s_addr = ((struct sockaddr_in *)addr)->sin_addr.s_addr;
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mreq.imr_interface.s_addr= INADDR_ANY; |
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if (setsockopt(sockfd, IPPROTO_IP, IP_ADD_MEMBERSHIP, (const void *)&mreq, sizeof(mreq)) < 0) { |
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av_log(NULL, AV_LOG_ERROR, "setsockopt(IP_ADD_MEMBERSHIP): %s\n", strerror(errno)); |
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return -1; |
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} |
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} |
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#endif
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#if HAVE_STRUCT_IPV6_MREQ && defined(IPPROTO_IPV6)
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if (addr->sa_family == AF_INET6) {
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struct ipv6_mreq mreq6;
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memcpy(&mreq6.ipv6mr_multiaddr, &(((struct sockaddr_in6 *)addr)->sin6_addr), sizeof(struct in6_addr)); |
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mreq6.ipv6mr_interface= 0;
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if (setsockopt(sockfd, IPPROTO_IPV6, IPV6_ADD_MEMBERSHIP, &mreq6, sizeof(mreq6)) < 0) { |
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av_log(NULL, AV_LOG_ERROR, "setsockopt(IPV6_ADD_MEMBERSHIP): %s\n", strerror(errno)); |
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return -1; |
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} |
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} |
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#endif
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return 0; |
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} |
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static int udp_leave_multicast_group(int sockfd, struct sockaddr *addr) |
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{ |
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#ifdef IP_DROP_MEMBERSHIP
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if (addr->sa_family == AF_INET) {
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struct ip_mreq mreq;
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mreq.imr_multiaddr.s_addr = ((struct sockaddr_in *)addr)->sin_addr.s_addr;
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mreq.imr_interface.s_addr= INADDR_ANY; |
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if (setsockopt(sockfd, IPPROTO_IP, IP_DROP_MEMBERSHIP, (const void *)&mreq, sizeof(mreq)) < 0) { |
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av_log(NULL, AV_LOG_ERROR, "setsockopt(IP_DROP_MEMBERSHIP): %s\n", strerror(errno)); |
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return -1; |
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} |
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} |
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#endif
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#if HAVE_STRUCT_IPV6_MREQ && defined(IPPROTO_IPV6)
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if (addr->sa_family == AF_INET6) {
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struct ipv6_mreq mreq6;
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memcpy(&mreq6.ipv6mr_multiaddr, &(((struct sockaddr_in6 *)addr)->sin6_addr), sizeof(struct in6_addr)); |
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mreq6.ipv6mr_interface= 0;
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if (setsockopt(sockfd, IPPROTO_IPV6, IPV6_DROP_MEMBERSHIP, &mreq6, sizeof(mreq6)) < 0) { |
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av_log(NULL, AV_LOG_ERROR, "setsockopt(IPV6_DROP_MEMBERSHIP): %s\n", strerror(errno)); |
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return -1; |
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} |
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} |
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#endif
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return 0; |
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} |
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static struct addrinfo* udp_resolve_host(const char *hostname, int port, |
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int type, int family, int flags) |
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{ |
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struct addrinfo hints, *res = 0; |
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int error;
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char sport[16]; |
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const char *node = 0, *service = "0"; |
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if (port > 0) { |
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snprintf(sport, sizeof(sport), "%d", port); |
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service = sport; |
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} |
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if ((hostname) && (hostname[0] != '\0') && (hostname[0] != '?')) { |
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node = hostname; |
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} |
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memset(&hints, 0, sizeof(hints)); |
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hints.ai_socktype = type; |
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hints.ai_family = family; |
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hints.ai_flags = flags; |
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if ((error = getaddrinfo(node, service, &hints, &res))) {
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res = NULL;
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av_log(NULL, AV_LOG_ERROR, "udp_resolve_host: %s\n", gai_strerror(error)); |
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} |
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return res;
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} |
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static int udp_set_url(struct sockaddr_storage *addr, |
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const char *hostname, int port) |
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{ |
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struct addrinfo *res0;
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int addr_len;
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res0 = udp_resolve_host(hostname, port, SOCK_DGRAM, AF_UNSPEC, 0);
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if (res0 == 0) return AVERROR(EIO); |
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memcpy(addr, res0->ai_addr, res0->ai_addrlen); |
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addr_len = res0->ai_addrlen; |
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freeaddrinfo(res0); |
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return addr_len;
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} |
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static int udp_socket_create(UDPContext *s, |
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struct sockaddr_storage *addr, int *addr_len) |
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{ |
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int udp_fd = -1; |
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struct addrinfo *res0 = NULL, *res = NULL; |
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int family = AF_UNSPEC;
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if (((struct sockaddr *) &s->dest_addr)->sa_family) |
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family = ((struct sockaddr *) &s->dest_addr)->sa_family;
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res0 = udp_resolve_host(0, s->local_port, SOCK_DGRAM, family, AI_PASSIVE);
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if (res0 == 0) |
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goto fail;
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for (res = res0; res; res=res->ai_next) {
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udp_fd = socket(res->ai_family, SOCK_DGRAM, 0);
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if (udp_fd > 0) break; |
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av_log(NULL, AV_LOG_ERROR, "socket: %s\n", strerror(errno)); |
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} |
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if (udp_fd < 0) |
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goto fail;
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memcpy(addr, res->ai_addr, res->ai_addrlen); |
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*addr_len = res->ai_addrlen; |
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freeaddrinfo(res0); |
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return udp_fd;
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fail:
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if (udp_fd >= 0) |
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closesocket(udp_fd); |
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if(res0)
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freeaddrinfo(res0); |
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return -1; |
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} |
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static int udp_port(struct sockaddr_storage *addr, int addr_len) |
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{ |
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char sbuf[sizeof(int)*3+1]; |
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if (getnameinfo((struct sockaddr *)addr, addr_len, NULL, 0, sbuf, sizeof(sbuf), NI_NUMERICSERV) != 0) { |
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av_log(NULL, AV_LOG_ERROR, "getnameinfo: %s\n", strerror(errno)); |
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return -1; |
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} |
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return strtol(sbuf, NULL, 10); |
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} |
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/**
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* If no filename is given to av_open_input_file because you want to
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* get the local port first, then you must call this function to set
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* the remote server address.
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*
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* url syntax: udp://host:port[?option=val...]
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* option: 'ttl=n' : set the ttl value (for multicast only)
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* 'localport=n' : set the local port
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* 'pkt_size=n' : set max packet size
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* 'reuse=1' : enable reusing the socket
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*
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* @param h media file context
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* @param uri of the remote server
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* @return zero if no error.
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*/
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int ff_udp_set_remote_url(URLContext *h, const char *uri) |
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{ |
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UDPContext *s = h->priv_data; |
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char hostname[256], buf[10]; |
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int port;
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const char *p; |
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av_url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port, NULL, 0, uri); |
253 |
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/* set the destination address */
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s->dest_addr_len = udp_set_url(&s->dest_addr, hostname, port); |
256 |
if (s->dest_addr_len < 0) { |
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return AVERROR(EIO);
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} |
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s->is_multicast = ff_is_multicast_address((struct sockaddr*) &s->dest_addr);
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p = strchr(uri, '?');
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if (p) {
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if (av_find_info_tag(buf, sizeof(buf), "connect", p)) { |
263 |
int was_connected = s->is_connected;
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s->is_connected = strtol(buf, NULL, 10); |
265 |
if (s->is_connected && !was_connected) {
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if (connect(s->udp_fd, (struct sockaddr *) &s->dest_addr, |
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s->dest_addr_len)) { |
268 |
s->is_connected = 0;
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av_log(h, AV_LOG_ERROR, "connect: %s\n", strerror(errno));
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return AVERROR(EIO);
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} |
272 |
} |
273 |
} |
274 |
} |
275 |
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return 0; |
277 |
} |
278 |
|
279 |
/**
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280 |
* Return the local port used by the UDP connection
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* @param h media file context
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* @return the local port number
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*/
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int ff_udp_get_local_port(URLContext *h)
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{ |
286 |
UDPContext *s = h->priv_data; |
287 |
return s->local_port;
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288 |
} |
289 |
|
290 |
/**
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291 |
* Return the udp file handle for select() usage to wait for several RTP
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292 |
* streams at the same time.
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293 |
* @param h media file context
|
294 |
*/
|
295 |
static int udp_get_file_handle(URLContext *h) |
296 |
{ |
297 |
UDPContext *s = h->priv_data; |
298 |
return s->udp_fd;
|
299 |
} |
300 |
|
301 |
/* put it in UDP context */
|
302 |
/* return non zero if error */
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303 |
static int udp_open(URLContext *h, const char *uri, int flags) |
304 |
{ |
305 |
char hostname[1024]; |
306 |
int port, udp_fd = -1, tmp, bind_ret = -1; |
307 |
UDPContext *s = NULL;
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int is_output;
|
309 |
const char *p; |
310 |
char buf[256]; |
311 |
struct sockaddr_storage my_addr;
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312 |
int len;
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313 |
int reuse_specified = 0; |
314 |
|
315 |
h->is_streamed = 1;
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316 |
h->max_packet_size = 1472;
|
317 |
|
318 |
is_output = !(flags & AVIO_FLAG_READ); |
319 |
|
320 |
s = av_mallocz(sizeof(UDPContext));
|
321 |
if (!s)
|
322 |
return AVERROR(ENOMEM);
|
323 |
|
324 |
h->priv_data = s; |
325 |
s->ttl = 16;
|
326 |
s->buffer_size = is_output ? UDP_TX_BUF_SIZE : UDP_MAX_PKT_SIZE; |
327 |
|
328 |
p = strchr(uri, '?');
|
329 |
if (p) {
|
330 |
if (av_find_info_tag(buf, sizeof(buf), "reuse", p)) { |
331 |
const char *endptr=NULL; |
332 |
s->reuse_socket = strtol(buf, &endptr, 10);
|
333 |
/* assume if no digits were found it is a request to enable it */
|
334 |
if (buf == endptr)
|
335 |
s->reuse_socket = 1;
|
336 |
reuse_specified = 1;
|
337 |
} |
338 |
if (av_find_info_tag(buf, sizeof(buf), "ttl", p)) { |
339 |
s->ttl = strtol(buf, NULL, 10); |
340 |
} |
341 |
if (av_find_info_tag(buf, sizeof(buf), "localport", p)) { |
342 |
s->local_port = strtol(buf, NULL, 10); |
343 |
} |
344 |
if (av_find_info_tag(buf, sizeof(buf), "pkt_size", p)) { |
345 |
h->max_packet_size = strtol(buf, NULL, 10); |
346 |
} |
347 |
if (av_find_info_tag(buf, sizeof(buf), "buffer_size", p)) { |
348 |
s->buffer_size = strtol(buf, NULL, 10); |
349 |
} |
350 |
if (av_find_info_tag(buf, sizeof(buf), "connect", p)) { |
351 |
s->is_connected = strtol(buf, NULL, 10); |
352 |
} |
353 |
} |
354 |
|
355 |
/* fill the dest addr */
|
356 |
av_url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port, NULL, 0, uri); |
357 |
|
358 |
/* XXX: fix av_url_split */
|
359 |
if (hostname[0] == '\0' || hostname[0] == '?') { |
360 |
/* only accepts null hostname if input */
|
361 |
if (!(flags & AVIO_FLAG_READ))
|
362 |
goto fail;
|
363 |
} else {
|
364 |
if (ff_udp_set_remote_url(h, uri) < 0) |
365 |
goto fail;
|
366 |
} |
367 |
|
368 |
if (s->is_multicast && (h->flags & AVIO_FLAG_READ))
|
369 |
s->local_port = port; |
370 |
udp_fd = udp_socket_create(s, &my_addr, &len); |
371 |
if (udp_fd < 0) |
372 |
goto fail;
|
373 |
|
374 |
/* Follow the requested reuse option, unless it's multicast in which
|
375 |
* case enable reuse unless explicitely disabled.
|
376 |
*/
|
377 |
if (s->reuse_socket || (s->is_multicast && !reuse_specified)) {
|
378 |
s->reuse_socket = 1;
|
379 |
if (setsockopt (udp_fd, SOL_SOCKET, SO_REUSEADDR, &(s->reuse_socket), sizeof(s->reuse_socket)) != 0) |
380 |
goto fail;
|
381 |
} |
382 |
|
383 |
/* the bind is needed to give a port to the socket now */
|
384 |
/* if multicast, try the multicast address bind first */
|
385 |
if (s->is_multicast && (h->flags & AVIO_FLAG_READ)) {
|
386 |
bind_ret = bind(udp_fd,(struct sockaddr *)&s->dest_addr, len);
|
387 |
} |
388 |
/* bind to the local address if not multicast or if the multicast
|
389 |
* bind failed */
|
390 |
if (bind_ret < 0 && bind(udp_fd,(struct sockaddr *)&my_addr, len) < 0) |
391 |
goto fail;
|
392 |
|
393 |
len = sizeof(my_addr);
|
394 |
getsockname(udp_fd, (struct sockaddr *)&my_addr, &len);
|
395 |
s->local_port = udp_port(&my_addr, len); |
396 |
|
397 |
if (s->is_multicast) {
|
398 |
if (!(h->flags & AVIO_FLAG_READ)) {
|
399 |
/* output */
|
400 |
if (udp_set_multicast_ttl(udp_fd, s->ttl, (struct sockaddr *)&s->dest_addr) < 0) |
401 |
goto fail;
|
402 |
} else {
|
403 |
/* input */
|
404 |
if (udp_join_multicast_group(udp_fd, (struct sockaddr *)&s->dest_addr) < 0) |
405 |
goto fail;
|
406 |
} |
407 |
} |
408 |
|
409 |
if (is_output) {
|
410 |
/* limit the tx buf size to limit latency */
|
411 |
tmp = s->buffer_size; |
412 |
if (setsockopt(udp_fd, SOL_SOCKET, SO_SNDBUF, &tmp, sizeof(tmp)) < 0) { |
413 |
av_log(h, AV_LOG_ERROR, "setsockopt(SO_SNDBUF): %s\n", strerror(errno));
|
414 |
goto fail;
|
415 |
} |
416 |
} else {
|
417 |
/* set udp recv buffer size to the largest possible udp packet size to
|
418 |
* avoid losing data on OSes that set this too low by default. */
|
419 |
tmp = s->buffer_size; |
420 |
if (setsockopt(udp_fd, SOL_SOCKET, SO_RCVBUF, &tmp, sizeof(tmp)) < 0) { |
421 |
av_log(h, AV_LOG_WARNING, "setsockopt(SO_RECVBUF): %s\n", strerror(errno));
|
422 |
} |
423 |
/* make the socket non-blocking */
|
424 |
ff_socket_nonblock(udp_fd, 1);
|
425 |
} |
426 |
if (s->is_connected) {
|
427 |
if (connect(udp_fd, (struct sockaddr *) &s->dest_addr, s->dest_addr_len)) { |
428 |
av_log(h, AV_LOG_ERROR, "connect: %s\n", strerror(errno));
|
429 |
goto fail;
|
430 |
} |
431 |
} |
432 |
|
433 |
s->udp_fd = udp_fd; |
434 |
return 0; |
435 |
fail:
|
436 |
if (udp_fd >= 0) |
437 |
closesocket(udp_fd); |
438 |
av_free(s); |
439 |
return AVERROR(EIO);
|
440 |
} |
441 |
|
442 |
static int udp_read(URLContext *h, uint8_t *buf, int size) |
443 |
{ |
444 |
UDPContext *s = h->priv_data; |
445 |
int ret;
|
446 |
|
447 |
if (!(h->flags & AVIO_FLAG_NONBLOCK)) {
|
448 |
ret = ff_network_wait_fd(s->udp_fd, 0);
|
449 |
if (ret < 0) |
450 |
return ret;
|
451 |
} |
452 |
ret = recv(s->udp_fd, buf, size, 0);
|
453 |
return ret < 0 ? ff_neterrno() : ret; |
454 |
} |
455 |
|
456 |
static int udp_write(URLContext *h, const uint8_t *buf, int size) |
457 |
{ |
458 |
UDPContext *s = h->priv_data; |
459 |
int ret;
|
460 |
|
461 |
if (!(h->flags & AVIO_FLAG_NONBLOCK)) {
|
462 |
ret = ff_network_wait_fd(s->udp_fd, 1);
|
463 |
if (ret < 0) |
464 |
return ret;
|
465 |
} |
466 |
|
467 |
if (!s->is_connected) {
|
468 |
ret = sendto (s->udp_fd, buf, size, 0,
|
469 |
(struct sockaddr *) &s->dest_addr,
|
470 |
s->dest_addr_len); |
471 |
} else
|
472 |
ret = send(s->udp_fd, buf, size, 0);
|
473 |
|
474 |
return ret < 0 ? ff_neterrno() : ret; |
475 |
} |
476 |
|
477 |
static int udp_close(URLContext *h) |
478 |
{ |
479 |
UDPContext *s = h->priv_data; |
480 |
|
481 |
if (s->is_multicast && (h->flags & AVIO_FLAG_READ))
|
482 |
udp_leave_multicast_group(s->udp_fd, (struct sockaddr *)&s->dest_addr);
|
483 |
closesocket(s->udp_fd); |
484 |
av_free(s); |
485 |
return 0; |
486 |
} |
487 |
|
488 |
URLProtocol ff_udp_protocol = { |
489 |
.name = "udp",
|
490 |
.url_open = udp_open, |
491 |
.url_read = udp_read, |
492 |
.url_write = udp_write, |
493 |
.url_close = udp_close, |
494 |
.url_get_file_handle = udp_get_file_handle, |
495 |
}; |