| /* |
| * 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 "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); |
| if (sap->ann_fd) |
| ffurl_close(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->filename); |
| 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_mallocz_array(s->nb_streams, sizeof(AVFormatContext*)); |
| 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; |
| |
| 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); |
| 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; |
| av_strlcpy(contexts[i]->filename, url, sizeof(contexts[i]->filename)); |
| } |
| |
| 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); |
| 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); |
| } |
| |
| AVOutputFormat ff_sap_muxer = { |
| .name = "sap", |
| .long_name = NULL_IF_CONFIG_SMALL("SAP output"), |
| .priv_data_size = sizeof(struct SAPState), |
| .audio_codec = AV_CODEC_ID_AAC, |
| .video_codec = AV_CODEC_ID_MPEG4, |
| .write_header = sap_write_header, |
| .write_packet = sap_write_packet, |
| .write_trailer = sap_write_close, |
| .flags = AVFMT_NOFILE | AVFMT_GLOBALHEADER, |
| }; |
