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265 lines
8.1 KiB
265 lines
8.1 KiB
/* |
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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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#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_FLAG_WRITE); |
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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_FLAG_WRITE); |
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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 (av_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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