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- /*
- * 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/intreadwrite.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_close(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;
- 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, *ai = NULL;
- memset(&hints, 0, sizeof(hints));
- 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(sizeof(AVFormatContext*) * s->nb_streams);
- if (!contexts) {
- ret = AVERROR(ENOMEM);
- goto fail;
- }
- 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(&fd, url, AVIO_FLAG_WRITE, &s->interrupt_callback, NULL);
- if (ret) {
- ret = AVERROR(EIO);
- goto fail;
- }
- s->streams[i]->priv_data = contexts[i] =
- ff_rtp_chain_mux_open(s, s->streams[i], fd, 0);
- av_strlcpy(contexts[i]->filename, url, sizeof(contexts[i]->filename));
- }
- ff_url_join(url, sizeof(url), "udp", NULL, announce_addr, port,
- "?ttl=%d&connect=1", ttl);
- ret = ffurl_open(&sap->ann_fd, url, AVIO_FLAG_WRITE,
- &s->interrupt_callback, 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();
- 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);
- }
- AVOutputFormat ff_sap_muxer = {
- .name = "sap",
- .long_name = NULL_IF_CONFIG_SMALL("SAP output format"),
- .priv_data_size = sizeof(struct SAPState),
- .audio_codec = CODEC_ID_AAC,
- .video_codec = CODEC_ID_MPEG4,
- .write_header = sap_write_header,
- .write_packet = sap_write_packet,
- .write_trailer = sap_write_close,
- .flags = AVFMT_NOFILE | AVFMT_GLOBALHEADER,
- };
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