265 lines
8.0 KiB
C
265 lines
8.0 KiB
C
/*
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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 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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#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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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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url_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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url_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 = url_open(&fd, url, URL_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 = url_open(&sap->ann_fd, url, URL_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 = url_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 > url_get_max_packet_size(sap->ann_fd)) {
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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 = url_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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