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018ce90284
FFmpeg/libavformat/sapenc.c
Martin Storsjö 6df9d9b55d lavf: Use av_gettime_relative 
The ones left using av_gettime are NTP timestamps (for RTCP,
which is specified to send the actual current realtime clock
in RTCP SR packets), and the NUT muxer timestamper, which is
documented as using wallclock time.

Signed-off-by: Martin Storsjö <martin@martin.st>
2014-10-24 09:53:45 +03:00

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8.7 KiB
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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_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;
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(&fd, url, AVIO_FLAG_WRITE, &s->interrupt_callback, 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;
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(&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_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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