| /* | |
| * Session Announcement Protocol (RFC 2974) muxer | |
| * Copyright (c) 2010 Martin Storsjo | |
| * | |
| * This file is part of FFmpeg. | |
| * | |
| * FFmpeg is free software; you can redistribute it and/or | |
| * modify it under the terms of the GNU Lesser General Public | |
| * License as published by the Free Software Foundation; either | |
| * version 2.1 of the License, or (at your option) any later version. | |
| * | |
| * FFmpeg is distributed in the hope that it will be useful, | |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| * Lesser General Public License for more details. | |
| * | |
| * You should have received a copy of the GNU Lesser General Public | |
| * License along with FFmpeg; if not, write to the Free Software | |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
| */ | |
| #include "avformat.h" | |
| #include "libavutil/parseutils.h" | |
| #include "libavutil/random_seed.h" | |
| #include "libavutil/avstring.h" | |
| #include "libavutil/dict.h" | |
| #include "libavutil/intreadwrite.h" | |
| #include "libavutil/time.h" | |
| #include "internal.h" | |
| #include "mux.h" | |
| #include "network.h" | |
| #include "os_support.h" | |
| #include "rtpenc_chain.h" | |
| #include "url.h" | |
| struct SAPState { | |
| uint8_t *ann; | |
| int ann_size; | |
| URLContext *ann_fd; | |
| int64_t last_time; | |
| }; | |
| static int sap_write_close(AVFormatContext *s) | |
| { | |
| struct SAPState *sap = s->priv_data; | |
| int i; | |
| for (i = 0; i < s->nb_streams; i++) { | |
| AVFormatContext *rtpctx = s->streams[i]->priv_data; | |
| if (!rtpctx) | |
| continue; | |
| av_write_trailer(rtpctx); | |
| avio_closep(&rtpctx->pb); | |
| avformat_free_context(rtpctx); | |
| s->streams[i]->priv_data = NULL; | |
| } | |
| if (sap->last_time && sap->ann && sap->ann_fd) { | |
| sap->ann[0] |= 4; /* Session deletion*/ | |
| ffurl_write(sap->ann_fd, sap->ann, sap->ann_size); | |
| } | |
| av_freep(&sap->ann); | |
| ffurl_closep(&sap->ann_fd); | |
| ff_network_close(); | |
| return 0; | |
| } | |
| static int sap_write_header(AVFormatContext *s) | |
| { | |
| struct SAPState *sap = s->priv_data; | |
| char host[1024], path[1024], url[1024], announce_addr[50] = ""; | |
| char *option_list; | |
| int port = 9875, base_port = 5004, i, pos = 0, same_port = 0, ttl = 255; | |
| AVFormatContext **contexts = NULL; | |
| int ret = 0; | |
| struct sockaddr_storage localaddr; | |
| socklen_t addrlen = sizeof(localaddr); | |
| int udp_fd; | |
| AVDictionaryEntry* title = av_dict_get(s->metadata, "title", NULL, 0); | |
| if (!ff_network_init()) | |
| return AVERROR(EIO); | |
| /* extract hostname and port */ | |
| av_url_split(NULL, 0, NULL, 0, host, sizeof(host), &base_port, | |
| path, sizeof(path), s->url); | |
| if (base_port < 0) | |
| base_port = 5004; | |
| /* search for options */ | |
| option_list = strrchr(path, '?'); | |
| if (option_list) { | |
| char buf[50]; | |
| if (av_find_info_tag(buf, sizeof(buf), "announce_port", option_list)) { | |
| port = strtol(buf, NULL, 10); | |
| } | |
| if (av_find_info_tag(buf, sizeof(buf), "same_port", option_list)) { | |
| same_port = strtol(buf, NULL, 10); | |
| } | |
| if (av_find_info_tag(buf, sizeof(buf), "ttl", option_list)) { | |
| ttl = strtol(buf, NULL, 10); | |
| } | |
| if (av_find_info_tag(buf, sizeof(buf), "announce_addr", option_list)) { | |
| av_strlcpy(announce_addr, buf, sizeof(announce_addr)); | |
| } | |
| } | |
| if (!announce_addr[0]) { | |
| struct addrinfo hints = { 0 }, *ai = NULL; | |
| hints.ai_family = AF_UNSPEC; | |
| if (getaddrinfo(host, NULL, &hints, &ai)) { | |
| av_log(s, AV_LOG_ERROR, "Unable to resolve %s\n", host); | |
| ret = AVERROR(EIO); | |
| goto fail; | |
| } | |
| if (ai->ai_family == AF_INET) { | |
| /* Also known as sap.mcast.net */ | |
| av_strlcpy(announce_addr, "224.2.127.254", sizeof(announce_addr)); | |
| #if HAVE_STRUCT_SOCKADDR_IN6 | |
| } else if (ai->ai_family == AF_INET6) { | |
| /* With IPv6, you can use the same destination in many different | |
| * multicast subnets, to choose how far you want it routed. | |
| * This one is intended to be routed globally. */ | |
| av_strlcpy(announce_addr, "ff0e::2:7ffe", sizeof(announce_addr)); | |
| #endif | |
| } else { | |
| freeaddrinfo(ai); | |
| av_log(s, AV_LOG_ERROR, "Host %s resolved to unsupported " | |
| "address family\n", host); | |
| ret = AVERROR(EIO); | |
| goto fail; | |
| } | |
| freeaddrinfo(ai); | |
| } | |
| contexts = av_calloc(s->nb_streams, sizeof(*contexts)); | |
| if (!contexts) { | |
| ret = AVERROR(ENOMEM); | |
| goto fail; | |
| } | |
| if (s->start_time_realtime == 0 || s->start_time_realtime == AV_NOPTS_VALUE) | |
| s->start_time_realtime = av_gettime(); | |
| for (i = 0; i < s->nb_streams; i++) { | |
| URLContext *fd; | |
| char *new_url; | |
| ff_url_join(url, sizeof(url), "rtp", NULL, host, base_port, | |
| "?ttl=%d", ttl); | |
| if (!same_port) | |
| base_port += 2; | |
| ret = ffurl_open_whitelist(&fd, url, AVIO_FLAG_WRITE, | |
| &s->interrupt_callback, NULL, | |
| s->protocol_whitelist, s->protocol_blacklist, NULL); | |
| if (ret) { | |
| ret = AVERROR(EIO); | |
| goto fail; | |
| } | |
| ret = ff_rtp_chain_mux_open(&contexts[i], s, s->streams[i], fd, 0, i); | |
| if (ret < 0) | |
| goto fail; | |
| s->streams[i]->priv_data = contexts[i]; | |
| s->streams[i]->time_base = contexts[i]->streams[0]->time_base; | |
| new_url = av_strdup(url); | |
| if (!new_url) { | |
| ret = AVERROR(ENOMEM); | |
| goto fail; | |
| } | |
| ff_format_set_url(contexts[i], new_url); | |
| } | |
| if (s->nb_streams > 0 && title) | |
| av_dict_set(&contexts[0]->metadata, "title", title->value, 0); | |
| ff_url_join(url, sizeof(url), "udp", NULL, announce_addr, port, | |
| "?ttl=%d&connect=1", ttl); | |
| ret = ffurl_open_whitelist(&sap->ann_fd, url, AVIO_FLAG_WRITE, | |
| &s->interrupt_callback, NULL, | |
| s->protocol_whitelist, s->protocol_blacklist, NULL); | |
| if (ret) { | |
| ret = AVERROR(EIO); | |
| goto fail; | |
| } | |
| udp_fd = ffurl_get_file_handle(sap->ann_fd); | |
| if (getsockname(udp_fd, (struct sockaddr*) &localaddr, &addrlen)) { | |
| ret = AVERROR(EIO); | |
| goto fail; | |
| } | |
| if (localaddr.ss_family != AF_INET | |
| #if HAVE_STRUCT_SOCKADDR_IN6 | |
| && localaddr.ss_family != AF_INET6 | |
| #endif | |
| ) { | |
| av_log(s, AV_LOG_ERROR, "Unsupported protocol family\n"); | |
| ret = AVERROR(EIO); | |
| goto fail; | |
| } | |
| sap->ann_size = 8192; | |
| sap->ann = av_mallocz(sap->ann_size); | |
| if (!sap->ann) { | |
| ret = AVERROR(EIO); | |
| goto fail; | |
| } | |
| sap->ann[pos] = (1 << 5); | |
| #if HAVE_STRUCT_SOCKADDR_IN6 | |
| if (localaddr.ss_family == AF_INET6) | |
| sap->ann[pos] |= 0x10; | |
| #endif | |
| pos++; | |
| sap->ann[pos++] = 0; /* Authentication length */ | |
| AV_WB16(&sap->ann[pos], av_get_random_seed()); | |
| pos += 2; | |
| if (localaddr.ss_family == AF_INET) { | |
| memcpy(&sap->ann[pos], &((struct sockaddr_in*)&localaddr)->sin_addr, | |
| sizeof(struct in_addr)); | |
| pos += sizeof(struct in_addr); | |
| #if HAVE_STRUCT_SOCKADDR_IN6 | |
| } else { | |
| memcpy(&sap->ann[pos], &((struct sockaddr_in6*)&localaddr)->sin6_addr, | |
| sizeof(struct in6_addr)); | |
| pos += sizeof(struct in6_addr); | |
| #endif | |
| } | |
| av_strlcpy(&sap->ann[pos], "application/sdp", sap->ann_size - pos); | |
| pos += strlen(&sap->ann[pos]) + 1; | |
| if (av_sdp_create(contexts, s->nb_streams, &sap->ann[pos], | |
| sap->ann_size - pos)) { | |
| ret = AVERROR_INVALIDDATA; | |
| goto fail; | |
| } | |
| av_freep(&contexts); | |
| av_log(s, AV_LOG_VERBOSE, "SDP:\n%s\n", &sap->ann[pos]); | |
| pos += strlen(&sap->ann[pos]); | |
| sap->ann_size = pos; | |
| if (sap->ann_size > sap->ann_fd->max_packet_size) { | |
| av_log(s, AV_LOG_ERROR, "Announcement too large to send in one " | |
| "packet\n"); | |
| goto fail; | |
| } | |
| return 0; | |
| fail: | |
| av_free(contexts); | |
| sap_write_close(s); | |
| return ret; | |
| } | |
| static int sap_write_packet(AVFormatContext *s, AVPacket *pkt) | |
| { | |
| AVFormatContext *rtpctx; | |
| struct SAPState *sap = s->priv_data; | |
| int64_t now = av_gettime_relative(); | |
| if (!sap->last_time || now - sap->last_time > 5000000) { | |
| int ret = ffurl_write(sap->ann_fd, sap->ann, sap->ann_size); | |
| /* Don't abort even if we get "Destination unreachable" */ | |
| if (ret < 0 && ret != AVERROR(ECONNREFUSED)) | |
| return ret; | |
| sap->last_time = now; | |
| } | |
| rtpctx = s->streams[pkt->stream_index]->priv_data; | |
| return ff_write_chained(rtpctx, 0, pkt, s, 0); | |
| } | |
| const FFOutputFormat ff_sap_muxer = { | |
| .p.name = "sap", | |
| .p.long_name = NULL_IF_CONFIG_SMALL("SAP output"), | |
| .priv_data_size = sizeof(struct SAPState), | |
| .p.audio_codec = AV_CODEC_ID_AAC, | |
| .p.video_codec = AV_CODEC_ID_MPEG4, | |
| .write_header = sap_write_header, | |
| .write_packet = sap_write_packet, | |
| .write_trailer = sap_write_close, | |
| .p.flags = AVFMT_NOFILE | AVFMT_GLOBALHEADER, | |
| }; |