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ffmpeg / libavformat / sapenc.c @ f87b1b37

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/*
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 * Session Announcement Protocol (RFC 2974) muxer
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 * Copyright (c) 2010 Martin Storsjo
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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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#include "avformat.h"
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#include "libavutil/parseutils.h"
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#include "libavutil/random_seed.h"
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#include "libavutil/avstring.h"
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#include "libavutil/intreadwrite.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 "rtpenc_chain.h"
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#include "url.h"
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struct SAPState {
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    uint8_t    *ann;
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    int         ann_size;
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    URLContext *ann_fd;
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    int64_t     last_time;
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};
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static int sap_write_close(AVFormatContext *s)
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{
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    struct SAPState *sap = s->priv_data;
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    int i;
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    for (i = 0; i < s->nb_streams; i++) {
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        AVFormatContext *rtpctx = s->streams[i]->priv_data;
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        if (!rtpctx)
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            continue;
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        av_write_trailer(rtpctx);
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        avio_close(rtpctx->pb);
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        avformat_free_context(rtpctx);
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        s->streams[i]->priv_data = NULL;
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    }
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    if (sap->last_time && sap->ann && sap->ann_fd) {
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        sap->ann[0] |= 4; /* Session deletion*/
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        ffurl_write(sap->ann_fd, sap->ann, sap->ann_size);
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    }
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    av_freep(&sap->ann);
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    if (sap->ann_fd)
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        ffurl_close(sap->ann_fd);
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    ff_network_close();
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    return 0;
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}
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static int sap_write_header(AVFormatContext *s)
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{
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    struct SAPState *sap = s->priv_data;
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    char host[1024], path[1024], url[1024], announce_addr[50] = "";
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    char *option_list;
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    int port = 9875, base_port = 5004, i, pos = 0, same_port = 0, ttl = 255;
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    AVFormatContext **contexts = NULL;
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    int ret = 0;
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    struct sockaddr_storage localaddr;
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    socklen_t addrlen = sizeof(localaddr);
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    int udp_fd;
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    if (!ff_network_init())
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        return AVERROR(EIO);
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    /* extract hostname and port */
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    av_url_split(NULL, 0, NULL, 0, host, sizeof(host), &base_port,
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                 path, sizeof(path), s->filename);
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    if (base_port < 0)
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        base_port = 5004;
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    /* search for options */
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    option_list = strrchr(path, '?');
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    if (option_list) {
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        char buf[50];
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        if (av_find_info_tag(buf, sizeof(buf), "announce_port", option_list)) {
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            port = strtol(buf, NULL, 10);
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        }
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        if (av_find_info_tag(buf, sizeof(buf), "same_port", option_list)) {
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            same_port = strtol(buf, NULL, 10);
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        }
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        if (av_find_info_tag(buf, sizeof(buf), "ttl", option_list)) {
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            ttl = strtol(buf, NULL, 10);
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        }
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        if (av_find_info_tag(buf, sizeof(buf), "announce_addr", option_list)) {
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            av_strlcpy(announce_addr, buf, sizeof(announce_addr));
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        }
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    }
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    if (!announce_addr[0]) {
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        struct addrinfo hints, *ai = NULL;
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        memset(&hints, 0, sizeof(hints));
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        hints.ai_family = AF_UNSPEC;
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        if (getaddrinfo(host, NULL, &hints, &ai)) {
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            av_log(s, AV_LOG_ERROR, "Unable to resolve %s\n", host);
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            ret = AVERROR(EIO);
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            goto fail;
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        }
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        if (ai->ai_family == AF_INET) {
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            /* Also known as sap.mcast.net */
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            av_strlcpy(announce_addr, "224.2.127.254", sizeof(announce_addr));
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#if HAVE_STRUCT_SOCKADDR_IN6
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        } else if (ai->ai_family == AF_INET6) {
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            /* With IPv6, you can use the same destination in many different
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             * multicast subnets, to choose how far you want it routed.
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             * This one is intended to be routed globally. */
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            av_strlcpy(announce_addr, "ff0e::2:7ffe", sizeof(announce_addr));
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#endif
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        } else {
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            freeaddrinfo(ai);
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            av_log(s, AV_LOG_ERROR, "Host %s resolved to unsupported "
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                                    "address family\n", host);
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            ret = AVERROR(EIO);
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            goto fail;
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        }
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        freeaddrinfo(ai);
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    }
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    contexts = av_mallocz(sizeof(AVFormatContext*) * s->nb_streams);
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    if (!contexts) {
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        ret = AVERROR(ENOMEM);
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        goto fail;
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    }
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    s->start_time_realtime = av_gettime();
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    for (i = 0; i < s->nb_streams; i++) {
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        URLContext *fd;
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        ff_url_join(url, sizeof(url), "rtp", NULL, host, base_port,
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                    "?ttl=%d", ttl);
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        if (!same_port)
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            base_port += 2;
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        ret = ffurl_open(&fd, url, AVIO_WRONLY);
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        if (ret) {
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            ret = AVERROR(EIO);
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            goto fail;
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        }
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        s->streams[i]->priv_data = contexts[i] =
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            ff_rtp_chain_mux_open(s, s->streams[i], fd, 0);
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        av_strlcpy(contexts[i]->filename, url, sizeof(contexts[i]->filename));
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    }
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    ff_url_join(url, sizeof(url), "udp", NULL, announce_addr, port,
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                "?ttl=%d&connect=1", ttl);
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    ret = ffurl_open(&sap->ann_fd, url, AVIO_WRONLY);
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    if (ret) {
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        ret = AVERROR(EIO);
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        goto fail;
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    }
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    udp_fd = ffurl_get_file_handle(sap->ann_fd);
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    if (getsockname(udp_fd, (struct sockaddr*) &localaddr, &addrlen)) {
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        ret = AVERROR(EIO);
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        goto fail;
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    }
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    if (localaddr.ss_family != AF_INET
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#if HAVE_STRUCT_SOCKADDR_IN6
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        && localaddr.ss_family != AF_INET6
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#endif
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        ) {
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        av_log(s, AV_LOG_ERROR, "Unsupported protocol family\n");
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        ret = AVERROR(EIO);
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        goto fail;
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    }
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    sap->ann_size = 8192;
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    sap->ann = av_mallocz(sap->ann_size);
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    if (!sap->ann) {
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        ret = AVERROR(EIO);
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        goto fail;
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    }
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    sap->ann[pos] = (1 << 5);
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#if HAVE_STRUCT_SOCKADDR_IN6
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    if (localaddr.ss_family == AF_INET6)
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        sap->ann[pos] |= 0x10;
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#endif
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    pos++;
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    sap->ann[pos++] = 0; /* Authentication length */
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    AV_WB16(&sap->ann[pos], av_get_random_seed());
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    pos += 2;
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    if (localaddr.ss_family == AF_INET) {
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        memcpy(&sap->ann[pos], &((struct sockaddr_in*)&localaddr)->sin_addr,
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               sizeof(struct in_addr));
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        pos += sizeof(struct in_addr);
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#if HAVE_STRUCT_SOCKADDR_IN6
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    } else {
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        memcpy(&sap->ann[pos], &((struct sockaddr_in6*)&localaddr)->sin6_addr,
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               sizeof(struct in6_addr));
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        pos += sizeof(struct in6_addr);
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#endif
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    }
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    av_strlcpy(&sap->ann[pos], "application/sdp", sap->ann_size - pos);
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    pos += strlen(&sap->ann[pos]) + 1;
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    if (avf_sdp_create(contexts, s->nb_streams, &sap->ann[pos],
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                       sap->ann_size - pos)) {
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        ret = AVERROR_INVALIDDATA;
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        goto fail;
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    }
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    av_freep(&contexts);
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    av_log(s, AV_LOG_VERBOSE, "SDP:\n%s\n", &sap->ann[pos]);
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    pos += strlen(&sap->ann[pos]);
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    sap->ann_size = pos;
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    if (sap->ann_size > sap->ann_fd->max_packet_size) {
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        av_log(s, AV_LOG_ERROR, "Announcement too large to send in one "
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                                "packet\n");
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        goto fail;
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    }
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    return 0;
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fail:
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    av_free(contexts);
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    sap_write_close(s);
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    return ret;
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}
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static int sap_write_packet(AVFormatContext *s, AVPacket *pkt)
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{
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    AVFormatContext *rtpctx;
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    struct SAPState *sap = s->priv_data;
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    int64_t now = av_gettime();
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    if (!sap->last_time || now - sap->last_time > 5000000) {
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        int ret = ffurl_write(sap->ann_fd, sap->ann, sap->ann_size);
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        /* Don't abort even if we get "Destination unreachable" */
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        if (ret < 0 && ret != AVERROR(ECONNREFUSED))
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            return ret;
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        sap->last_time = now;
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    }
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    rtpctx = s->streams[pkt->stream_index]->priv_data;
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    return ff_write_chained(rtpctx, 0, pkt, s);
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}
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AVOutputFormat ff_sap_muxer = {
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    "sap",
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    NULL_IF_CONFIG_SMALL("SAP output format"),
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    NULL,
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    NULL,
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    sizeof(struct SAPState),
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    CODEC_ID_AAC,
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    CODEC_ID_MPEG4,
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    sap_write_header,
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    sap_write_packet,
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    sap_write_close,
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    .flags = AVFMT_NOFILE | AVFMT_GLOBALHEADER,
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};
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