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ffmpeg / libavformat / udp.c @ 20f269dc

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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 library 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 of the License, or (at your option) any later version.
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 *
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 * This library 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 this library; if not, write to the Free Software
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 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
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 */
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#include "avformat.h"
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#ifndef __BEOS__
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# include <arpa/inet.h>
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#else
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# include "barpainet.h"
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#endif
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#include <netdb.h>
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typedef struct {
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    int udp_fd;
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    int ttl;
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    int is_multicast;
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    int local_port;
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    struct ip_mreq mreq;
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    struct sockaddr_in dest_addr;
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} UDPContext;
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#define UDP_TX_BUF_SIZE 32768
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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: 'multicast=1' : enable multicast 
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 *         '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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 *
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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, hostname, sizeof(hostname), &port, NULL, 0, uri);
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    /* set the destination address */
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    if (resolve_host(&s->dest_addr.sin_addr, hostname) < 0)
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        return -EIO;
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    s->dest_addr.sin_family = AF_INET;
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    s->dest_addr.sin_port = htons(port);
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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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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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    struct sockaddr_in my_addr, my_addr1;
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    char hostname[1024];
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    int port, udp_fd = -1, tmp;
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    UDPContext *s = NULL;
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    int is_output, len;
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    const char *p;
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    char buf[256];
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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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    s = av_malloc(sizeof(UDPContext));
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    if (!s)
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        return -ENOMEM;
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    h->priv_data = s;
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    s->ttl = 16;
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    s->is_multicast = 0;
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    s->local_port = 0;
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    p = strchr(uri, '?');
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    if (p) {
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        s->is_multicast = find_info_tag(buf, sizeof(buf), "multicast", 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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    }
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    /* fill the dest addr */
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    url_split(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 (s->is_multicast || (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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    udp_fd = socket(PF_INET, SOCK_DGRAM, 0);
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    if (udp_fd < 0)
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        goto fail;
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    my_addr.sin_family = AF_INET;
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    my_addr.sin_addr.s_addr = htonl (INADDR_ANY);
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    if (s->is_multicast && !(h->flags & URL_WRONLY)) {
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        /* special case: the bind must be done on the multicast address port */
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        my_addr.sin_port = s->dest_addr.sin_port;
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    } else {
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        my_addr.sin_port = htons(s->local_port);
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    }
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    /* the bind is needed to give a port to the socket now */
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    if (bind(udp_fd,(struct sockaddr *)&my_addr, sizeof(my_addr)) < 0) 
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        goto fail;
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    len = sizeof(my_addr1);
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    getsockname(udp_fd, (struct sockaddr *)&my_addr1, &len);
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    s->local_port = ntohs(my_addr1.sin_port);
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#ifndef CONFIG_BEOS_NETSERVER
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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 (setsockopt(udp_fd, IPPROTO_IP, IP_MULTICAST_TTL, 
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                           &s->ttl, sizeof(s->ttl)) < 0) {
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                perror("IP_MULTICAST_TTL");
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                goto fail;
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            }
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        } else {
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            /* input */
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            memset(&s->mreq, 0, sizeof(s->mreq));
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            s->mreq.imr_multiaddr = s->dest_addr.sin_addr;
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            s->mreq.imr_interface.s_addr = htonl (INADDR_ANY);
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            if (setsockopt(udp_fd, IPPROTO_IP, IP_ADD_MEMBERSHIP, 
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                           &s->mreq, sizeof(s->mreq)) < 0) {
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                perror("rtp: IP_ADD_MEMBERSHIP");
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                goto fail;
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            }
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        }
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    }
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#endif
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    if (is_output) {
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        /* limit the tx buf size to limit latency */
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        tmp = UDP_TX_BUF_SIZE;
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        if (setsockopt(udp_fd, SOL_SOCKET, SO_SNDBUF, &tmp, sizeof(tmp)) < 0) {
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            perror("setsockopt sndbuf");
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            goto fail;
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        }
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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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#ifdef CONFIG_BEOS_NETSERVER
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        closesocket(udp_fd);
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#else
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        close(udp_fd);
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#endif
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    av_free(s);
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    return -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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    struct sockaddr_in from;
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    int from_len, len;
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    for(;;) {
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        from_len = sizeof(from);
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        len = recvfrom (s->udp_fd, buf, size, 0,
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                        (struct sockaddr *)&from, &from_len);
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        if (len < 0) {
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            if (errno != EAGAIN && errno != EINTR)
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                return -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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                      sizeof (s->dest_addr));
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        if (ret < 0) {
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            if (errno != EINTR && errno != EAGAIN)
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                return -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)
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{
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    UDPContext *s = h->priv_data;
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#ifndef CONFIG_BEOS_NETSERVER
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    if (s->is_multicast && !(h->flags & URL_WRONLY)) {
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        if (setsockopt(s->udp_fd, IPPROTO_IP, IP_DROP_MEMBERSHIP, 
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                       &s->mreq, sizeof(s->mreq)) < 0) {
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            perror("IP_DROP_MEMBERSHIP");
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        }
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    }
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    close(s->udp_fd);
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#else
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    closesocket(s->udp_fd);
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#endif
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    av_free(s);
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    return 0;
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}
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URLProtocol udp_protocol = {
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    "udp",
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    udp_open,
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    udp_read,
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    udp_write,
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    NULL, /* seek */
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    udp_close,
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};