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ffmpeg/libav/rtsp.c

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/*
* RTSP client
* Copyright (c) 2002 Fabrice Bellard.
*
* This library 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 of the License, or (at your option) any later version.
*
* This library 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 this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "avformat.h"
#include <sys/time.h>
#include <netinet/in.h>
#include <sys/socket.h>
#include <arpa/inet.h>
//#define DEBUG
typedef struct RTSPState {
URLContext *rtsp_hd; /* RTSP TCP connexion handle */
ByteIOContext rtsp_gb;
int seq; /* RTSP command sequence number */
char session_id[512];
enum RTSPProtocol protocol;
char last_reply[2048]; /* XXX: allocate ? */
} RTSPState;
typedef struct RTSPStream {
AVFormatContext *ic;
int interleaved_min, interleaved_max; /* interleave ids, if TCP transport */
char control_url[1024]; /* url for this stream */
} RTSPStream;
/* suppress this hack */
int rtsp_abort_req = 0;
/* XXX: currently, the only way to change the protocols consists in
changing this variable */
int rtsp_default_protocols = (1 << RTSP_PROTOCOL_RTP_TCP) | (1 << RTSP_PROTOCOL_RTP_UDP) | (1 << RTSP_PROTOCOL_RTP_UDP_MULTICAST);
FFRTSPCallback *ff_rtsp_callback = NULL;
static int rtsp_probe(AVProbeData *p)
{
if (strstart(p->filename, "rtsp:", NULL))
return AVPROBE_SCORE_MAX;
return 0;
}
static int redir_isspace(int c)
{
return (c == ' ' || c == '\t' || c == '\n' || c == '\r');
}
static void skip_spaces(const char **pp)
{
const char *p;
p = *pp;
while (redir_isspace(*p))
p++;
*pp = p;
}
static void get_word_sep(char *buf, int buf_size, const char *sep,
const char **pp)
{
const char *p;
char *q;
p = *pp;
skip_spaces(&p);
q = buf;
while (!strchr(sep, *p) && *p != '\0') {
if ((q - buf) < buf_size - 1)
*q++ = *p;
p++;
}
if (buf_size > 0)
*q = '\0';
*pp = p;
}
static void get_word(char *buf, int buf_size, const char **pp)
{
const char *p;
char *q;
p = *pp;
skip_spaces(&p);
q = buf;
while (!redir_isspace(*p) && *p != '\0') {
if ((q - buf) < buf_size - 1)
*q++ = *p;
p++;
}
if (buf_size > 0)
*q = '\0';
*pp = p;
}
static void sdp_parse_line(AVFormatContext *s,
int letter, const char *buf)
{
char buf1[64], st_type[64];
const char *p;
int codec_type, payload_type;
AVStream *st;
RTSPStream *rtsp_st;
#ifdef DEBUG
printf("sdp: %c='%s'\n", letter, buf);
#endif
p = buf;
switch(letter) {
case 's':
pstrcpy(s->title, sizeof(s->title), p);
break;
case 'i':
if (s->nb_streams == 0) {
pstrcpy(s->comment, sizeof(s->comment), p);
break;
}
break;
case 'm':
/* new stream */
get_word(st_type, sizeof(st_type), &p);
if (!strcmp(st_type, "audio")) {
codec_type = CODEC_TYPE_AUDIO;
} else if (!strcmp(st_type, "video")) {
codec_type = CODEC_TYPE_VIDEO;
} else {
return;
}
get_word(buf1, sizeof(buf1), &p); /* port */
get_word(buf1, sizeof(buf1), &p); /* protocol */
/* XXX: handle list of formats */
get_word(buf1, sizeof(buf1), &p); /* format list */
payload_type = atoi(buf1);
rtsp_st = av_mallocz(sizeof(RTSPStream));
if (!rtsp_st)
return;
st = av_new_stream(s, s->nb_streams);
if (!st)
return;
st->priv_data = rtsp_st;
/* put a default control url */
pstrcpy(rtsp_st->control_url, sizeof(rtsp_st->control_url), s->filename);
st->codec.codec_type = codec_type;
rtp_get_codec_info(&st->codec, payload_type);
break;
case 'a':
if (strstart(p, "control:", &p) && s->nb_streams > 0) {
char proto[32];
/* get the control url */
st = s->streams[s->nb_streams - 1];
rtsp_st = st->priv_data;
/* XXX: may need to add full url resolution */
url_split(proto, sizeof(proto), NULL, 0, NULL, NULL, 0, p);
if (proto[0] == '\0') {
/* relative control URL */
pstrcat(rtsp_st->control_url, sizeof(rtsp_st->control_url), "/");
pstrcat(rtsp_st->control_url, sizeof(rtsp_st->control_url), p);
} else {
pstrcpy(rtsp_st->control_url, sizeof(rtsp_st->control_url), p);
}
}
break;
}
}
int sdp_parse(AVFormatContext *s, const char *content)
{
const char *p;
int letter;
char buf[1024], *q;
p = content;
for(;;) {
skip_spaces(&p);
letter = *p;
if (letter == '\0')
break;
p++;
if (*p != '=')
goto next_line;
p++;
/* get the content */
q = buf;
while (*p != '\n' && *p != '\0') {
if ((q - buf) < sizeof(buf) - 1)
*q++ = *p;
p++;
}
*q = '\0';
sdp_parse_line(s, letter, buf);
next_line:
while (*p != '\n' && *p != '\0')
p++;
if (*p == '\n')
p++;
}
return 0;
}
static void rtsp_parse_range(int *min_ptr, int *max_ptr, const char **pp)
{
const char *p;
int v;
p = *pp;
skip_spaces(&p);
v = strtol(p, (char **)&p, 10);
if (*p == '-') {
p++;
*min_ptr = v;
v = strtol(p, (char **)&p, 10);
*max_ptr = v;
} else {
*min_ptr = v;
*max_ptr = v;
}
*pp = p;
}
/* XXX: only one transport specification is parsed */
static void rtsp_parse_transport(RTSPHeader *reply, const char *p)
{
char transport_protocol[16];
char profile[16];
char lower_transport[16];
char parameter[16];
RTSPTransportField *th;
char buf[256];
reply->nb_transports = 0;
for(;;) {
skip_spaces(&p);
if (*p == '\0')
break;
th = &reply->transports[reply->nb_transports];
get_word_sep(transport_protocol, sizeof(transport_protocol),
"/", &p);
if (*p == '/')
p++;
get_word_sep(profile, sizeof(profile), "/;,", &p);
lower_transport[0] = '\0';
if (*p == '/') {
get_word_sep(lower_transport, sizeof(lower_transport),
";,", &p);
}
if (!strcmp(lower_transport, "TCP"))
th->protocol = RTSP_PROTOCOL_RTP_TCP;
else
th->protocol = RTSP_PROTOCOL_RTP_UDP;
if (*p == ';')
p++;
/* get each parameter */
while (*p != '\0' && *p != ',') {
get_word_sep(parameter, sizeof(parameter), "=;,", &p);
if (!strcmp(parameter, "port")) {
if (*p == '=') {
p++;
rtsp_parse_range(&th->port_min, &th->port_max, &p);
}
} else if (!strcmp(parameter, "client_port")) {
if (*p == '=') {
p++;
rtsp_parse_range(&th->client_port_min,
&th->client_port_max, &p);
}
} else if (!strcmp(parameter, "server_port")) {
if (*p == '=') {
p++;
rtsp_parse_range(&th->server_port_min,
&th->server_port_max, &p);
}
} else if (!strcmp(parameter, "interleaved")) {
if (*p == '=') {
p++;
rtsp_parse_range(&th->interleaved_min,
&th->interleaved_max, &p);
}
} else if (!strcmp(parameter, "multicast")) {
if (th->protocol == RTSP_PROTOCOL_RTP_UDP)
th->protocol = RTSP_PROTOCOL_RTP_UDP_MULTICAST;
} else if (!strcmp(parameter, "ttl")) {
if (*p == '=') {
p++;
th->ttl = strtol(p, (char **)&p, 10);
}
} else if (!strcmp(parameter, "destination")) {
struct in_addr ipaddr;
if (*p == '=') {
p++;
get_word_sep(buf, sizeof(buf), ";,", &p);
if (inet_aton(buf, &ipaddr))
th->destination = ntohl(ipaddr.s_addr);
}
}
while (*p != ';' && *p != '\0' && *p != ',')
p++;
if (*p == ';')
p++;
}
if (*p == ',')
p++;
reply->nb_transports++;
}
}
void rtsp_parse_line(RTSPHeader *reply, const char *buf)
{
const char *p;
/* NOTE: we do case independent match for broken servers */
p = buf;
if (stristart(p, "Session:", &p)) {
get_word_sep(reply->session_id, sizeof(reply->session_id), ";", &p);
} else if (stristart(p, "Content-Length:", &p)) {
reply->content_length = strtol(p, NULL, 10);
} else if (stristart(p, "Transport:", &p)) {
rtsp_parse_transport(reply, p);
} else if (stristart(p, "CSeq:", &p)) {
reply->seq = strtol(p, NULL, 10);
}
}
static void rtsp_send_cmd(AVFormatContext *s,
const char *cmd, RTSPHeader *reply,
unsigned char **content_ptr)
{
RTSPState *rt = s->priv_data;
char buf[4096], buf1[1024], *q;
unsigned char ch;
const char *p;
int content_length, line_count;
unsigned char *content = NULL;
memset(reply, 0, sizeof(RTSPHeader));
rt->seq++;
pstrcpy(buf, sizeof(buf), cmd);
snprintf(buf1, sizeof(buf1), "CSeq: %d\n", rt->seq);
pstrcat(buf, sizeof(buf), buf1);
if (rt->session_id[0] != '\0' && !strstr(cmd, "\nIf-Match:")) {
snprintf(buf1, sizeof(buf1), "Session: %s\n", rt->session_id);
pstrcat(buf, sizeof(buf), buf1);
}
pstrcat(buf, sizeof(buf), "\n");
#ifdef DEBUG
printf("Sending:\n%s--\n", buf);
#endif
url_write(rt->rtsp_hd, buf, strlen(buf));
/* parse reply (XXX: use buffers) */
line_count = 0;
rt->last_reply[0] = '\0';
for(;;) {
q = buf;
for(;;) {
if (url_read(rt->rtsp_hd, &ch, 1) == 0)
break;
if (ch == '\n')
break;
if (ch != '\r') {
if ((q - buf) < sizeof(buf) - 1)
*q++ = ch;
}
}
*q = '\0';
#ifdef DEBUG
printf("line='%s'\n", buf);
#endif
/* test if last line */
if (buf[0] == '\0')
break;
p = buf;
if (line_count == 0) {
/* get reply code */
get_word(buf1, sizeof(buf1), &p);
get_word(buf1, sizeof(buf1), &p);
reply->status_code = atoi(buf1);
} else {
rtsp_parse_line(reply, p);
pstrcat(rt->last_reply, sizeof(rt->last_reply), p);
pstrcat(rt->last_reply, sizeof(rt->last_reply), "\n");
}
line_count++;
}
if (rt->session_id[0] == '\0' && reply->session_id[0] != '\0')
pstrcpy(rt->session_id, sizeof(rt->session_id), reply->session_id);
content_length = reply->content_length;
if (content_length > 0) {
/* leave some room for a trailing '\0' (useful for simple parsing) */
content = av_malloc(content_length + 1);
url_read(rt->rtsp_hd, content, content_length);
content[content_length] = '\0';
}
if (content_ptr)
*content_ptr = content;
}
/* useful for modules: set RTSP callback function */
void rtsp_set_callback(FFRTSPCallback *rtsp_cb)
{
ff_rtsp_callback = rtsp_cb;
}
static int rtsp_read_header(AVFormatContext *s,
AVFormatParameters *ap)
{
RTSPState *rt = s->priv_data;
char host[1024], path[1024], tcpname[1024], cmd[2048];
URLContext *rtsp_hd;
int port, i, ret, err;
RTSPHeader reply1, *reply = &reply1;
unsigned char *content = NULL;
AVStream *st;
RTSPStream *rtsp_st;
int protocol_mask;
rtsp_abort_req = 0;
/* extract hostname and port */
url_split(NULL, 0,
host, sizeof(host), &port, path, sizeof(path), s->filename);
if (port < 0)
port = RTSP_DEFAULT_PORT;
/* open the tcp connexion */
snprintf(tcpname, sizeof(tcpname), "tcp://%s:%d", host, port);
if (url_open(&rtsp_hd, tcpname, URL_RDWR) < 0)
return AVERROR_IO;
rt->rtsp_hd = rtsp_hd;
rt->seq = 0;
/* describe the stream */
snprintf(cmd, sizeof(cmd),
"DESCRIBE %s RTSP/1.0\n"
"Accept: application/sdp\n",
s->filename);
rtsp_send_cmd(s, cmd, reply, &content);
if (!content) {
err = AVERROR_INVALIDDATA;
goto fail;
}
if (reply->status_code != RTSP_STATUS_OK) {
err = AVERROR_INVALIDDATA;
goto fail;
}
/* now we got the SDP description, we parse it */
ret = sdp_parse(s, (const char *)content);
av_freep(&content);
if (ret < 0) {
err = AVERROR_INVALIDDATA;
goto fail;
}
protocol_mask = rtsp_default_protocols;
/* for each stream, make the setup request */
/* XXX: we assume the same server is used for the control of each
RTSP stream */
for(i=0;i<s->nb_streams;i++) {
AVInputFormat *fmt;
char transport[2048];
st = s->streams[i];
rtsp_st = st->priv_data;
/* compute available transports */
transport[0] = '\0';
/* RTP/UDP */
if (protocol_mask & (1 << RTSP_PROTOCOL_RTP_UDP)) {
fmt = &rtp_demux;
if (av_open_input_file(&rtsp_st->ic, "rtp://", fmt, 0, NULL) < 0) {
err = AVERROR_INVALIDDATA;
goto fail;
}
port = rtp_get_local_port(url_fileno(&rtsp_st->ic->pb));
if (transport[0] != '\0')
pstrcat(transport, sizeof(transport), ",");
snprintf(transport + strlen(transport), sizeof(transport) - strlen(transport) - 1,
"RTP/AVP/UDP;unicast;client_port=%d-%d",
port, port + 1);
}
/* RTP/TCP */
if (protocol_mask & (1 << RTSP_PROTOCOL_RTP_TCP)) {
if (transport[0] != '\0')
pstrcat(transport, sizeof(transport), ",");
snprintf(transport + strlen(transport), sizeof(transport) - strlen(transport) - 1,
"RTP/AVP/TCP");
}
if (protocol_mask & (1 << RTSP_PROTOCOL_RTP_UDP_MULTICAST)) {
if (transport[0] != '\0')
pstrcat(transport, sizeof(transport), ",");
snprintf(transport + strlen(transport),
sizeof(transport) - strlen(transport) - 1,
"RTP/AVP/UDP;multicast");
}
snprintf(cmd, sizeof(cmd),
"SETUP %s RTSP/1.0\n"
"Transport: %s\n",
rtsp_st->control_url, transport);
rtsp_send_cmd(s, cmd, reply, NULL);
if (reply->status_code != RTSP_STATUS_OK ||
reply->nb_transports != 1) {
err = AVERROR_INVALIDDATA;
goto fail;
}
/* XXX: same protocol for all streams is required */
if (i > 0) {
if (reply->transports[0].protocol != rt->protocol) {
err = AVERROR_INVALIDDATA;
goto fail;
}
} else {
rt->protocol = reply->transports[0].protocol;
}
/* close RTP connection if not choosen */
if (reply->transports[0].protocol != RTSP_PROTOCOL_RTP_UDP &&
(protocol_mask & (1 << RTSP_PROTOCOL_RTP_UDP))) {
av_close_input_file(rtsp_st->ic);
rtsp_st->ic = NULL;
}
switch(reply->transports[0].protocol) {
case RTSP_PROTOCOL_RTP_TCP:
fmt = &rtp_demux;
if (av_open_input_file(&rtsp_st->ic, "null", fmt, 0, NULL) < 0) {
err = AVERROR_INVALIDDATA;
goto fail;
}
rtsp_st->interleaved_min = reply->transports[0].interleaved_min;
rtsp_st->interleaved_max = reply->transports[0].interleaved_max;
break;
case RTSP_PROTOCOL_RTP_UDP:
{
char url[1024];
/* XXX: also use address if specified */
snprintf(url, sizeof(url), "rtp://%s:%d",
host, reply->transports[0].server_port_min);
if (rtp_set_remote_url(url_fileno(&rtsp_st->ic->pb), url) < 0) {
err = AVERROR_INVALIDDATA;
goto fail;
}
}
break;
case RTSP_PROTOCOL_RTP_UDP_MULTICAST:
{
char url[1024];
int ttl;
fmt = &rtp_demux;
ttl = reply->transports[0].ttl;
if (!ttl)
ttl = 16;
snprintf(url, sizeof(url), "rtp://%s:%d?multicast=1&ttl=%d",
host,
reply->transports[0].server_port_min,
ttl);
if (av_open_input_file(&rtsp_st->ic, url, fmt, 0, NULL) < 0) {
err = AVERROR_INVALIDDATA;
goto fail;
}
}
break;
}
}
/* use callback if available to extend setup */
if (ff_rtsp_callback) {
if (ff_rtsp_callback(RTSP_ACTION_CLIENT_SETUP, rt->session_id,
NULL, 0, rt->last_reply) < 0) {
err = AVERROR_INVALIDDATA;
goto fail;
}
}
/* start playing */
snprintf(cmd, sizeof(cmd),
"PLAY %s RTSP/1.0\n",
s->filename);
rtsp_send_cmd(s, cmd, reply, NULL);
if (reply->status_code != RTSP_STATUS_OK) {
err = AVERROR_INVALIDDATA;
goto fail;
}
/* open TCP with bufferized input */
if (rt->protocol == RTSP_PROTOCOL_RTP_TCP) {
if (url_fdopen(&rt->rtsp_gb, rt->rtsp_hd) < 0) {
err = AVERROR_NOMEM;
goto fail;
}
}
return 0;
fail:
for(i=0;i<s->nb_streams;i++) {
st = s->streams[i];
rtsp_st = st->priv_data;
if (rtsp_st) {
if (rtsp_st->ic)
av_close_input_file(rtsp_st->ic);
}
av_free(rtsp_st);
}
av_freep(&content);
url_close(rt->rtsp_hd);
return err;
}
static int tcp_read_packet(AVFormatContext *s,
AVPacket *pkt)
{
RTSPState *rt = s->priv_data;
ByteIOContext *rtsp_gb = &rt->rtsp_gb;
int c, id, len, i, ret;
AVStream *st;
RTSPStream *rtsp_st;
char buf[RTP_MAX_PACKET_LENGTH];
redo:
for(;;) {
c = url_fgetc(rtsp_gb);
if (c == URL_EOF)
return AVERROR_IO;
if (c == '$')
break;
}
id = get_byte(rtsp_gb);
len = get_be16(rtsp_gb);
if (len > RTP_MAX_PACKET_LENGTH || len < 12)
goto redo;
/* get the data */
get_buffer(rtsp_gb, buf, len);
/* find the matching stream */
for(i = 0; i < s->nb_streams; i++) {
st = s->streams[i];
rtsp_st = st->priv_data;
if (i >= rtsp_st->interleaved_min &&
i <= rtsp_st->interleaved_max)
goto found;
}
goto redo;
found:
ret = rtp_parse_packet(rtsp_st->ic, pkt, buf, len);
if (ret < 0)
goto redo;
pkt->stream_index = i;
return ret;
}
/* NOTE: output one packet at a time. May need to add a small fifo */
static int udp_read_packet(AVFormatContext *s,
AVPacket *pkt)
{
AVFormatContext *ic;
AVStream *st;
RTSPStream *rtsp_st;
fd_set rfds;
int fd1, fd2, fd_max, n, i, ret;
char buf[RTP_MAX_PACKET_LENGTH];
struct timeval tv;
for(;;) {
if (rtsp_abort_req)
return -EIO;
FD_ZERO(&rfds);
fd_max = -1;
for(i = 0; i < s->nb_streams; i++) {
st = s->streams[i];
rtsp_st = st->priv_data;
ic = rtsp_st->ic;
/* currently, we cannot probe RTCP handle because of blocking restrictions */
rtp_get_file_handles(url_fileno(&ic->pb), &fd1, &fd2);
if (fd1 > fd_max)
fd_max = fd1;
FD_SET(fd1, &rfds);
}
/* XXX: also add proper API to abort */
tv.tv_sec = 0;
tv.tv_usec = 500000;
n = select(fd_max + 1, &rfds, NULL, NULL, &tv);
if (n > 0) {
for(i = 0; i < s->nb_streams; i++) {
st = s->streams[i];
rtsp_st = st->priv_data;
ic = rtsp_st->ic;
rtp_get_file_handles(url_fileno(&ic->pb), &fd1, &fd2);
if (FD_ISSET(fd1, &rfds)) {
ret = url_read(url_fileno(&ic->pb), buf, sizeof(buf));
if (ret >= 0 &&
rtp_parse_packet(ic, pkt, buf, ret) == 0) {
pkt->stream_index = i;
return ret;
}
}
}
}
}
}
static int rtsp_read_packet(AVFormatContext *s,
AVPacket *pkt)
{
RTSPState *rt = s->priv_data;
int ret;
switch(rt->protocol) {
default:
case RTSP_PROTOCOL_RTP_TCP:
ret = tcp_read_packet(s, pkt);
break;
case RTSP_PROTOCOL_RTP_UDP:
ret = udp_read_packet(s, pkt);
break;
}
return ret;
}
static int rtsp_read_close(AVFormatContext *s)
{
RTSPState *rt = s->priv_data;
AVStream *st;
RTSPStream *rtsp_st;
RTSPHeader reply1, *reply = &reply1;
int i;
char cmd[1024];
/* NOTE: it is valid to flush the buffer here */
if (rt->protocol == RTSP_PROTOCOL_RTP_TCP) {
url_fclose(&rt->rtsp_gb);
}
snprintf(cmd, sizeof(cmd),
"TEARDOWN %s RTSP/1.0\n",
s->filename);
rtsp_send_cmd(s, cmd, reply, NULL);
if (ff_rtsp_callback) {
ff_rtsp_callback(RTSP_ACTION_CLIENT_TEARDOWN, rt->session_id,
NULL, 0, NULL);
}
for(i=0;i<s->nb_streams;i++) {
st = s->streams[i];
rtsp_st = st->priv_data;
if (rtsp_st) {
if (rtsp_st->ic)
av_close_input_file(rtsp_st->ic);
}
av_free(rtsp_st);
}
url_close(rt->rtsp_hd);
return 0;
}
static AVInputFormat rtsp_demux = {
"rtsp",
"RTSP input format",
sizeof(RTSPState),
rtsp_probe,
rtsp_read_header,
rtsp_read_packet,
rtsp_read_close,
flags: AVFMT_NOFILE,
};
/* dummy redirector format (used directly in av_open_input_file now) */
static int redir_probe(AVProbeData *pd)
{
const char *p;
p = pd->buf;
while (redir_isspace(*p))
p++;
if (strstart(p, "http://", NULL) ||
strstart(p, "rtsp://", NULL))
return AVPROBE_SCORE_MAX;
return 0;
}
/* called from utils.c */
int redir_open(AVFormatContext **ic_ptr, ByteIOContext *f)
{
char buf[4096], *q;
int c;
AVFormatContext *ic = NULL;
/* parse each URL and try to open it */
c = url_fgetc(f);
while (c != URL_EOF) {
/* skip spaces */
for(;;) {
if (!redir_isspace(c))
break;
c = url_fgetc(f);
}
if (c == URL_EOF)
break;
/* record url */
q = buf;
for(;;) {
if (c == URL_EOF || redir_isspace(c))
break;
if ((q - buf) < sizeof(buf) - 1)
*q++ = c;
c = url_fgetc(f);
}
*q = '\0';
//printf("URL='%s'\n", buf);
/* try to open the media file */
if (av_open_input_file(&ic, buf, NULL, 0, NULL) == 0)
break;
}
*ic_ptr = ic;
if (!ic)
return AVERROR_IO;
else
return 0;
}
AVInputFormat redir_demux = {
"redir",
"Redirector format",
0,
redir_probe,
NULL,
NULL,
NULL,
};
int rtsp_init(void)
{
av_register_input_format(&rtsp_demux);
av_register_input_format(&redir_demux);
return 0;
}
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