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FFmpeg4/libavformat/sapenc.c

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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/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);
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_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;
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);
}
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,
};
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