mirror of
https://git.videolan.org/git/ffmpeg.git
synced 2024-08-31 05:26:37 +02:00
498 lines
14 KiB
C
498 lines
14 KiB
C
/*
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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 FFmpeg.
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*
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* FFmpeg 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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* FFmpeg 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 FFmpeg; 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 libavformat/udp.c
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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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#include "avformat.h"
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#include <unistd.h>
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#include "network.h"
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#include "os_support.h"
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#if HAVE_SYS_SELECT_H
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#include <sys/select.h>
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#endif
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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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#ifndef IN_MULTICAST
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#define IN_MULTICAST(a) ((((uint32_t)(a)) & 0xf0000000) == 0xe0000000)
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#endif
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#ifndef IN6_IS_ADDR_MULTICAST
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#define IN6_IS_ADDR_MULTICAST(a) (((uint8_t *) (a))[0] == 0xff)
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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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} 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
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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
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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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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 is_multicast_address(struct sockaddr_storage *addr)
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{
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if (addr->ss_family == AF_INET) {
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return IN_MULTICAST(ntohl(((struct sockaddr_in *)addr)->sin_addr.s_addr));
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}
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#if HAVE_STRUCT_SOCKADDR_IN6
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if (addr->ss_family == AF_INET6) {
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return IN6_IS_ADDR_MULTICAST(&((struct sockaddr_in6 *)addr)->sin6_addr);
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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_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 s1 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 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];
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int port;
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url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port, NULL, 0, uri);
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/* set the destination address */
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s->dest_addr_len = udp_set_url(&s->dest_addr, hostname, port);
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if (s->dest_addr_len < 0) {
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return AVERROR(EIO);
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}
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s->is_multicast = is_multicast_address(&s->dest_addr);
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return 0;
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}
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/**
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* Return the local port used by the UDP connexion
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* @param s1 media file context
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* @return the local port number
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*/
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int udp_get_local_port(URLContext *h)
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{
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UDPContext *s = h->priv_data;
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return s->local_port;
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}
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/**
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* Return the udp file handle for select() usage to wait for several RTP
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* streams at the same time.
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* @param h media file context
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*/
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#if (LIBAVFORMAT_VERSION_MAJOR >= 53)
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static
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#endif
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int udp_get_file_handle(URLContext *h)
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{
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UDPContext *s = h->priv_data;
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return s->udp_fd;
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}
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/* put it in UDP context */
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/* return non zero if error */
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static int udp_open(URLContext *h, const char *uri, int flags)
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{
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char hostname[1024];
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int port, udp_fd = -1, tmp, bind_ret = -1;
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UDPContext *s = NULL;
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int is_output;
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const char *p;
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char buf[256];
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struct sockaddr_storage my_addr;
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int len;
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h->is_streamed = 1;
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h->max_packet_size = 1472;
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is_output = (flags & URL_WRONLY);
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if(!ff_network_init())
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return AVERROR(EIO);
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s = av_mallocz(sizeof(UDPContext));
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if (!s)
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return AVERROR(ENOMEM);
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h->priv_data = s;
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s->ttl = 16;
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s->buffer_size = is_output ? UDP_TX_BUF_SIZE : UDP_MAX_PKT_SIZE;
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p = strchr(uri, '?');
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if (p) {
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s->reuse_socket = find_info_tag(buf, sizeof(buf), "reuse", p);
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if (find_info_tag(buf, sizeof(buf), "ttl", p)) {
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s->ttl = strtol(buf, NULL, 10);
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}
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if (find_info_tag(buf, sizeof(buf), "localport", p)) {
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s->local_port = strtol(buf, NULL, 10);
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}
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if (find_info_tag(buf, sizeof(buf), "pkt_size", p)) {
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h->max_packet_size = strtol(buf, NULL, 10);
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}
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if (find_info_tag(buf, sizeof(buf), "buffer_size", p)) {
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s->buffer_size = strtol(buf, NULL, 10);
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}
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}
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/* fill the dest addr */
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url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port, NULL, 0, uri);
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/* XXX: fix url_split */
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if (hostname[0] == '\0' || hostname[0] == '?') {
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/* only accepts null hostname if input */
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if (flags & URL_WRONLY)
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goto fail;
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} else {
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udp_set_remote_url(h, uri);
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}
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if (s->is_multicast && !(h->flags & URL_WRONLY))
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s->local_port = port;
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udp_fd = udp_socket_create(s, &my_addr, &len);
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if (udp_fd < 0)
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goto fail;
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if (s->reuse_socket)
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if (setsockopt (udp_fd, SOL_SOCKET, SO_REUSEADDR, &(s->reuse_socket), sizeof(s->reuse_socket)) != 0)
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goto fail;
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/* the bind is needed to give a port to the socket now */
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/* if multicast, try the multicast address bind first */
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if (s->is_multicast && !(h->flags & URL_WRONLY)) {
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bind_ret = bind(udp_fd,(struct sockaddr *)&s->dest_addr, len);
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}
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/* bind to the local address if not multicast or if the multicast
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* bind failed */
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if (bind_ret < 0 && bind(udp_fd,(struct sockaddr *)&my_addr, len) < 0)
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goto fail;
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len = sizeof(my_addr);
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getsockname(udp_fd, (struct sockaddr *)&my_addr, &len);
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s->local_port = udp_port(&my_addr, len);
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if (s->is_multicast) {
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if (h->flags & URL_WRONLY) {
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/* output */
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if (udp_set_multicast_ttl(udp_fd, s->ttl, (struct sockaddr *)&s->dest_addr) < 0)
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goto fail;
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} else {
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/* input */
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if (udp_join_multicast_group(udp_fd, (struct sockaddr *)&s->dest_addr) < 0)
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goto fail;
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}
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}
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if (is_output) {
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/* limit the tx buf size to limit latency */
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tmp = s->buffer_size;
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if (setsockopt(udp_fd, SOL_SOCKET, SO_SNDBUF, &tmp, sizeof(tmp)) < 0) {
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av_log(NULL, AV_LOG_ERROR, "setsockopt(SO_SNDBUF): %s\n", strerror(errno));
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goto fail;
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}
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} else {
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/* set udp recv buffer size to the largest possible udp packet size to
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* avoid losing data on OSes that set this too low by default. */
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tmp = s->buffer_size;
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if (setsockopt(udp_fd, SOL_SOCKET, SO_RCVBUF, &tmp, sizeof(tmp)) < 0) {
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av_log(NULL, AV_LOG_WARNING, "setsockopt(SO_RECVBUF): %s\n", strerror(errno));
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}
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/* make the socket non-blocking */
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ff_socket_nonblock(udp_fd, 1);
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}
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s->udp_fd = udp_fd;
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return 0;
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fail:
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if (udp_fd >= 0)
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closesocket(udp_fd);
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av_free(s);
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return AVERROR(EIO);
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}
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static int udp_read(URLContext *h, uint8_t *buf, int size)
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{
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UDPContext *s = h->priv_data;
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int len;
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fd_set rfds;
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int ret;
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struct timeval tv;
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for(;;) {
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if (url_interrupt_cb())
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return AVERROR(EINTR);
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FD_ZERO(&rfds);
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FD_SET(s->udp_fd, &rfds);
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tv.tv_sec = 0;
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tv.tv_usec = 100 * 1000;
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ret = select(s->udp_fd + 1, &rfds, NULL, NULL, &tv);
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if (ret < 0)
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return AVERROR(EIO);
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if (!(ret > 0 && FD_ISSET(s->udp_fd, &rfds)))
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continue;
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len = recv(s->udp_fd, buf, size, 0);
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if (len < 0) {
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if (ff_neterrno() != FF_NETERROR(EAGAIN) &&
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ff_neterrno() != FF_NETERROR(EINTR))
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return AVERROR(EIO);
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} else {
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break;
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}
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}
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return len;
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}
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static int udp_write(URLContext *h, uint8_t *buf, int size)
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{
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UDPContext *s = h->priv_data;
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int ret;
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for(;;) {
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ret = sendto (s->udp_fd, buf, size, 0,
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(struct sockaddr *) &s->dest_addr,
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s->dest_addr_len);
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if (ret < 0) {
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if (ff_neterrno() != FF_NETERROR(EINTR) &&
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ff_neterrno() != FF_NETERROR(EAGAIN))
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return AVERROR(EIO);
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} else {
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break;
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}
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}
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return size;
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}
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|
|
static int udp_close(URLContext *h)
|
|
{
|
|
UDPContext *s = h->priv_data;
|
|
|
|
if (s->is_multicast && !(h->flags & URL_WRONLY))
|
|
udp_leave_multicast_group(s->udp_fd, (struct sockaddr *)&s->dest_addr);
|
|
closesocket(s->udp_fd);
|
|
ff_network_close();
|
|
av_free(s);
|
|
return 0;
|
|
}
|
|
|
|
URLProtocol udp_protocol = {
|
|
"udp",
|
|
udp_open,
|
|
udp_read,
|
|
udp_write,
|
|
NULL, /* seek */
|
|
udp_close,
|
|
.url_get_file_handle = udp_get_file_handle,
|
|
};
|