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ffmpeg/libavformat/rtsp.c

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/*
* RTSP/SDP client
* Copyright (c) 2002 Fabrice Bellard
*
* 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
*/
/* needed by inet_aton() */
#define _SVID_SOURCE
#include "libavutil/avstring.h"
#include "libavutil/intreadwrite.h"
#include "avformat.h"
#include <sys/time.h>
#if HAVE_SYS_SELECT_H
#include <sys/select.h>
#endif
#include <strings.h>
#include "network.h"
#include "rtsp.h"
#include "rtpdec.h"
#include "rdt.h"
#include "rtp_asf.h"
#include "rtp_vorbis.h"
//#define DEBUG
//#define DEBUG_RTP_TCP
static int rtsp_read_play(AVFormatContext *s);
#if LIBAVFORMAT_VERSION_INT < (53 << 16)
int rtsp_default_protocols = (1 << RTSP_LOWER_TRANSPORT_UDP);
#endif
static int rtsp_probe(AVProbeData *p)
{
if (av_strstart(p->filename, "rtsp:", NULL))
return AVPROBE_SCORE_MAX;
return 0;
}
#define SPACE_CHARS " \t\r\n"
/* we use memchr() instead of strchr() here because strchr() will return
* the terminating '\0' of SPACE_CHARS instead of NULL if c is '\0'. */
#define redir_isspace(c) memchr(SPACE_CHARS, c, 4)
static void skip_spaces(const char **pp)
{
const char *p;
p = *pp;
while (redir_isspace(*p))
p++;
*pp = p;
}
static void get_word_until_chars(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_sep(char *buf, int buf_size, const char *sep,
const char **pp)
{
if (**pp == '/') (*pp)++;
get_word_until_chars(buf, buf_size, sep, pp);
}
static void get_word(char *buf, int buf_size, const char **pp)
{
get_word_until_chars(buf, buf_size, SPACE_CHARS, pp);
}
/* parse the rtpmap description: <codec_name>/<clock_rate>[/<other
params>] */
static int sdp_parse_rtpmap(AVCodecContext *codec, RTSPStream *rtsp_st, int payload_type, const char *p)
{
char buf[256];
int i;
AVCodec *c;
const char *c_name;
/* Loop into AVRtpDynamicPayloadTypes[] and AVRtpPayloadTypes[] and
see if we can handle this kind of payload */
get_word_sep(buf, sizeof(buf), "/", &p);
if (payload_type >= RTP_PT_PRIVATE) {
RTPDynamicProtocolHandler *handler= RTPFirstDynamicPayloadHandler;
while(handler) {
if (!strcasecmp(buf, handler->enc_name) && (codec->codec_type == handler->codec_type)) {
codec->codec_id = handler->codec_id;
rtsp_st->dynamic_handler= handler;
if(handler->open) {
rtsp_st->dynamic_protocol_context= handler->open();
}
break;
}
handler= handler->next;
}
} else {
/* We are in a standard case ( from http://www.iana.org/assignments/rtp-parameters) */
/* search into AVRtpPayloadTypes[] */
codec->codec_id = ff_rtp_codec_id(buf, codec->codec_type);
}
c = avcodec_find_decoder(codec->codec_id);
if (c && c->name)
c_name = c->name;
else
c_name = (char *)NULL;
if (c_name) {
get_word_sep(buf, sizeof(buf), "/", &p);
i = atoi(buf);
switch (codec->codec_type) {
case CODEC_TYPE_AUDIO:
av_log(codec, AV_LOG_DEBUG, " audio codec set to : %s\n", c_name);
codec->sample_rate = RTSP_DEFAULT_AUDIO_SAMPLERATE;
codec->channels = RTSP_DEFAULT_NB_AUDIO_CHANNELS;
if (i > 0) {
codec->sample_rate = i;
get_word_sep(buf, sizeof(buf), "/", &p);
i = atoi(buf);
if (i > 0)
codec->channels = i;
// TODO: there is a bug here; if it is a mono stream, and less than 22000Hz, faad upconverts to stereo and twice the
// frequency. No problem, but the sample rate is being set here by the sdp line. Upcoming patch forthcoming. (rdm)
}
av_log(codec, AV_LOG_DEBUG, " audio samplerate set to : %i\n", codec->sample_rate);
av_log(codec, AV_LOG_DEBUG, " audio channels set to : %i\n", codec->channels);
break;
case CODEC_TYPE_VIDEO:
av_log(codec, AV_LOG_DEBUG, " video codec set to : %s\n", c_name);
break;
default:
break;
}
return 0;
}
return -1;
}
/* return the length and optionnaly the data */
static int hex_to_data(uint8_t *data, const char *p)
{
int c, len, v;
len = 0;
v = 1;
for(;;) {
skip_spaces(&p);
if (*p == '\0')
break;
c = toupper((unsigned char)*p++);
if (c >= '0' && c <= '9')
c = c - '0';
else if (c >= 'A' && c <= 'F')
c = c - 'A' + 10;
else
break;
v = (v << 4) | c;
if (v & 0x100) {
if (data)
data[len] = v;
len++;
v = 1;
}
}
return len;
}
static void sdp_parse_fmtp_config(AVCodecContext * codec, void *ctx,
char *attr, char *value)
{
switch (codec->codec_id) {
case CODEC_ID_MPEG4:
case CODEC_ID_AAC:
if (!strcmp(attr, "config")) {
/* decode the hexa encoded parameter */
int len = hex_to_data(NULL, value);
if (codec->extradata)
av_free(codec->extradata);
codec->extradata = av_mallocz(len + FF_INPUT_BUFFER_PADDING_SIZE);
if (!codec->extradata)
return;
codec->extradata_size = len;
hex_to_data(codec->extradata, value);
}
break;
case CODEC_ID_VORBIS:
ff_vorbis_parse_fmtp_config(codec, ctx, attr, value);
break;
default:
break;
}
return;
}
typedef struct {
const char *str;
uint16_t type;
uint32_t offset;
} AttrNameMap;
/* All known fmtp parmeters and the corresping RTPAttrTypeEnum */
#define ATTR_NAME_TYPE_INT 0
#define ATTR_NAME_TYPE_STR 1
static const AttrNameMap attr_names[]=
{
{"SizeLength", ATTR_NAME_TYPE_INT, offsetof(RTPPayloadData, sizelength)},
{"IndexLength", ATTR_NAME_TYPE_INT, offsetof(RTPPayloadData, indexlength)},
{"IndexDeltaLength", ATTR_NAME_TYPE_INT, offsetof(RTPPayloadData, indexdeltalength)},
{"profile-level-id", ATTR_NAME_TYPE_INT, offsetof(RTPPayloadData, profile_level_id)},
{"StreamType", ATTR_NAME_TYPE_INT, offsetof(RTPPayloadData, streamtype)},
{"mode", ATTR_NAME_TYPE_STR, offsetof(RTPPayloadData, mode)},
{NULL, -1, -1},
};
/** parse the attribute line from the fmtp a line of an sdp resonse. This is broken out as a function
* because it is used in rtp_h264.c, which is forthcoming.
*/
int rtsp_next_attr_and_value(const char **p, char *attr, int attr_size, char *value, int value_size)
{
skip_spaces(p);
if(**p) {
get_word_sep(attr, attr_size, "=", p);
if (**p == '=')
(*p)++;
get_word_sep(value, value_size, ";", p);
if (**p == ';')
(*p)++;
return 1;
}
return 0;
}
/* parse a SDP line and save stream attributes */
static void sdp_parse_fmtp(AVStream *st, const char *p)
{
char attr[256];
/* Vorbis setup headers can be up to 12KB and are sent base64
* encoded, giving a 12KB * (4/3) = 16KB FMTP line. */
char value[16384];
int i;
RTSPStream *rtsp_st = st->priv_data;
AVCodecContext *codec = st->codec;
RTPPayloadData *rtp_payload_data = &rtsp_st->rtp_payload_data;
/* loop on each attribute */
while(rtsp_next_attr_and_value(&p, attr, sizeof(attr), value, sizeof(value)))
{
/* grab the codec extra_data from the config parameter of the fmtp line */
sdp_parse_fmtp_config(codec, rtsp_st->dynamic_protocol_context,
attr, value);
/* Looking for a known attribute */
for (i = 0; attr_names[i].str; ++i) {
if (!strcasecmp(attr, attr_names[i].str)) {
if (attr_names[i].type == ATTR_NAME_TYPE_INT)
*(int *)((char *)rtp_payload_data + attr_names[i].offset) = atoi(value);
else if (attr_names[i].type == ATTR_NAME_TYPE_STR)
*(char **)((char *)rtp_payload_data + attr_names[i].offset) = av_strdup(value);
}
}
}
}
/** Parse a string \p in the form of Range:npt=xx-xx, and determine the start
* and end time.
* Used for seeking in the rtp stream.
*/
static void rtsp_parse_range_npt(const char *p, int64_t *start, int64_t *end)
{
char buf[256];
skip_spaces(&p);
if (!av_stristart(p, "npt=", &p))
return;
*start = AV_NOPTS_VALUE;
*end = AV_NOPTS_VALUE;
get_word_sep(buf, sizeof(buf), "-", &p);
*start = parse_date(buf, 1);
if (*p == '-') {
p++;
get_word_sep(buf, sizeof(buf), "-", &p);
*end = parse_date(buf, 1);
}
// av_log(NULL, AV_LOG_DEBUG, "Range Start: %lld\n", *start);
// av_log(NULL, AV_LOG_DEBUG, "Range End: %lld\n", *end);
}
typedef struct SDPParseState {
/* SDP only */
struct in_addr default_ip;
int default_ttl;
int skip_media; ///< set if an unknown m= line occurs
} SDPParseState;
static void sdp_parse_line(AVFormatContext *s, SDPParseState *s1,
int letter, const char *buf)
{
RTSPState *rt = s->priv_data;
char buf1[64], st_type[64];
const char *p;
enum CodecType codec_type;
int payload_type, i;
AVStream *st;
RTSPStream *rtsp_st;
struct in_addr sdp_ip;
int ttl;
dprintf(s, "sdp: %c='%s'\n", letter, buf);
p = buf;
if (s1->skip_media && letter != 'm')
return;
switch(letter) {
case 'c':
get_word(buf1, sizeof(buf1), &p);
if (strcmp(buf1, "IN") != 0)
return;
get_word(buf1, sizeof(buf1), &p);
if (strcmp(buf1, "IP4") != 0)
return;
get_word_sep(buf1, sizeof(buf1), "/", &p);
if (inet_aton(buf1, &sdp_ip) == 0)
return;
ttl = 16;
if (*p == '/') {
p++;
get_word_sep(buf1, sizeof(buf1), "/", &p);
ttl = atoi(buf1);
}
if (s->nb_streams == 0) {
s1->default_ip = sdp_ip;
s1->default_ttl = ttl;
} else {
st = s->streams[s->nb_streams - 1];
rtsp_st = st->priv_data;
rtsp_st->sdp_ip = sdp_ip;
rtsp_st->sdp_ttl = ttl;
}
break;
case 's':
av_metadata_set(&s->metadata, "title", p);
break;
case 'i':
if (s->nb_streams == 0) {
av_metadata_set(&s->metadata, "comment", p);
break;
}
break;
case 'm':
/* new stream */
s1->skip_media = 0;
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 if (!strcmp(st_type, "application")) {
codec_type = CODEC_TYPE_DATA;
} else {
s1->skip_media = 1;
return;
}
rtsp_st = av_mallocz(sizeof(RTSPStream));
if (!rtsp_st)
return;
rtsp_st->stream_index = -1;
dynarray_add(&rt->rtsp_streams, &rt->nb_rtsp_streams, rtsp_st);
rtsp_st->sdp_ip = s1->default_ip;
rtsp_st->sdp_ttl = s1->default_ttl;
get_word(buf1, sizeof(buf1), &p); /* port */
rtsp_st->sdp_port = atoi(buf1);
get_word(buf1, sizeof(buf1), &p); /* protocol (ignored) */
/* XXX: handle list of formats */
get_word(buf1, sizeof(buf1), &p); /* format list */
rtsp_st->sdp_payload_type = atoi(buf1);
if (!strcmp(ff_rtp_enc_name(rtsp_st->sdp_payload_type), "MP2T")) {
/* no corresponding stream */
} else {
st = av_new_stream(s, 0);
if (!st)
return;
st->priv_data = rtsp_st;
rtsp_st->stream_index = st->index;
st->codec->codec_type = codec_type;
if (rtsp_st->sdp_payload_type < RTP_PT_PRIVATE) {
/* if standard payload type, we can find the codec right now */
ff_rtp_get_codec_info(st->codec, rtsp_st->sdp_payload_type);
}
}
/* put a default control url */
av_strlcpy(rtsp_st->control_url, s->filename, sizeof(rtsp_st->control_url));
break;
case 'a':
if (av_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, 0, NULL, NULL, 0, p);
if (proto[0] == '\0') {
/* relative control URL */
av_strlcat(rtsp_st->control_url, "/", sizeof(rtsp_st->control_url));
av_strlcat(rtsp_st->control_url, p, sizeof(rtsp_st->control_url));
} else {
av_strlcpy(rtsp_st->control_url, p, sizeof(rtsp_st->control_url));
}
} else if (av_strstart(p, "rtpmap:", &p) && s->nb_streams > 0) {
/* NOTE: rtpmap is only supported AFTER the 'm=' tag */
get_word(buf1, sizeof(buf1), &p);
payload_type = atoi(buf1);
st = s->streams[s->nb_streams - 1];
rtsp_st = st->priv_data;
sdp_parse_rtpmap(st->codec, rtsp_st, payload_type, p);
} else if (av_strstart(p, "fmtp:", &p)) {
/* NOTE: fmtp is only supported AFTER the 'a=rtpmap:xxx' tag */
get_word(buf1, sizeof(buf1), &p);
payload_type = atoi(buf1);
for(i = 0; i < s->nb_streams;i++) {
st = s->streams[i];
rtsp_st = st->priv_data;
if (rtsp_st->sdp_payload_type == payload_type) {
if(rtsp_st->dynamic_handler && rtsp_st->dynamic_handler->parse_sdp_a_line) {
if(!rtsp_st->dynamic_handler->parse_sdp_a_line(s, i, rtsp_st->dynamic_protocol_context, buf)) {
sdp_parse_fmtp(st, p);
}
} else {
sdp_parse_fmtp(st, p);
}
}
}
} else if(av_strstart(p, "framesize:", &p)) {
// let dynamic protocol handlers have a stab at the line.
get_word(buf1, sizeof(buf1), &p);
payload_type = atoi(buf1);
for(i = 0; i < s->nb_streams;i++) {
st = s->streams[i];
rtsp_st = st->priv_data;
if (rtsp_st->sdp_payload_type == payload_type) {
if(rtsp_st->dynamic_handler && rtsp_st->dynamic_handler->parse_sdp_a_line) {
rtsp_st->dynamic_handler->parse_sdp_a_line(s, i, rtsp_st->dynamic_protocol_context, buf);
}
}
}
} else if(av_strstart(p, "range:", &p)) {
int64_t start, end;
// this is so that seeking on a streamed file can work.
rtsp_parse_range_npt(p, &start, &end);
s->start_time= start;
s->duration= (end==AV_NOPTS_VALUE)?AV_NOPTS_VALUE:end-start; // AV_NOPTS_VALUE means live broadcast (and can't seek)
} else if (av_strstart(p, "IsRealDataType:integer;",&p)) {
if (atoi(p) == 1)
rt->transport = RTSP_TRANSPORT_RDT;
} else {
if (rt->server_type == RTSP_SERVER_WMS)
ff_wms_parse_sdp_a_line(s, p);
if (s->nb_streams > 0) {
if (rt->server_type == RTSP_SERVER_REAL)
ff_real_parse_sdp_a_line(s, s->nb_streams - 1, p);
rtsp_st = s->streams[s->nb_streams - 1]->priv_data;
if (rtsp_st->dynamic_handler &&
rtsp_st->dynamic_handler->parse_sdp_a_line)
rtsp_st->dynamic_handler->parse_sdp_a_line(s, s->nb_streams - 1,
rtsp_st->dynamic_protocol_context, buf);
}
}
break;
}
}
static int sdp_parse(AVFormatContext *s, const char *content)
{
const char *p;
int letter;
/* Some SDP lines, particularly for Realmedia or ASF RTSP streams,
* contain long SDP lines containing complete ASF Headers (several
* kB) or arrays of MDPR (RM stream descriptor) headers plus
* "rulebooks" describing their properties. Therefore, the SDP line
* buffer is large.
*
* The Vorbis FMTP line can be up to 16KB - see sdp_parse_fmtp. */
char buf[16384], *q;
SDPParseState sdp_parse_state, *s1 = &sdp_parse_state;
memset(s1, 0, sizeof(SDPParseState));
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 != '\r' && *p != '\0') {
if ((q - buf) < sizeof(buf) - 1)
*q++ = *p;
p++;
}
*q = '\0';
sdp_parse_line(s, s1, 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(RTSPMessageHeader *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 (!strcasecmp (transport_protocol, "rtp")) {
get_word_sep(profile, sizeof(profile), "/;,", &p);
lower_transport[0] = '\0';
/* rtp/avp/<protocol> */
if (*p == '/') {
get_word_sep(lower_transport, sizeof(lower_transport),
";,", &p);
}
th->transport = RTSP_TRANSPORT_RTP;
} else if (!strcasecmp (transport_protocol, "x-pn-tng") ||
!strcasecmp (transport_protocol, "x-real-rdt")) {
/* x-pn-tng/<protocol> */
get_word_sep(lower_transport, sizeof(lower_transport), "/;,", &p);
profile[0] = '\0';
th->transport = RTSP_TRANSPORT_RDT;
}
if (!strcasecmp(lower_transport, "TCP"))
th->lower_transport = RTSP_LOWER_TRANSPORT_TCP;
else
th->lower_transport = RTSP_LOWER_TRANSPORT_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->lower_transport == RTSP_LOWER_TRANSPORT_UDP)
th->lower_transport = RTSP_LOWER_TRANSPORT_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(RTSPMessageHeader *reply, const char *buf)
{
const char *p;
/* NOTE: we do case independent match for broken servers */
p = buf;
if (av_stristart(p, "Session:", &p)) {
int t;
get_word_sep(reply->session_id, sizeof(reply->session_id), ";", &p);
if (av_stristart(p, ";timeout=", &p) &&
(t = strtol(p, NULL, 10)) > 0) {
reply->timeout = t;
}
} else if (av_stristart(p, "Content-Length:", &p)) {
reply->content_length = strtol(p, NULL, 10);
} else if (av_stristart(p, "Transport:", &p)) {
rtsp_parse_transport(reply, p);
} else if (av_stristart(p, "CSeq:", &p)) {
reply->seq = strtol(p, NULL, 10);
} else if (av_stristart(p, "Range:", &p)) {
rtsp_parse_range_npt(p, &reply->range_start, &reply->range_end);
} else if (av_stristart(p, "RealChallenge1:", &p)) {
skip_spaces(&p);
av_strlcpy(reply->real_challenge, p, sizeof(reply->real_challenge));
} else if (av_stristart(p, "Server:", &p)) {
skip_spaces(&p);
av_strlcpy(reply->server, p, sizeof(reply->server));
}
}
/* skip a RTP/TCP interleaved packet */
static void rtsp_skip_packet(AVFormatContext *s)
{
RTSPState *rt = s->priv_data;
int ret, len, len1;
uint8_t buf[1024];
ret = url_read_complete(rt->rtsp_hd, buf, 3);
if (ret != 3)
return;
len = AV_RB16(buf + 1);
dprintf(s, "skipping RTP packet len=%d\n", len);
/* skip payload */
while (len > 0) {
len1 = len;
if (len1 > sizeof(buf))
len1 = sizeof(buf);
ret = url_read_complete(rt->rtsp_hd, buf, len1);
if (ret != len1)
return;
len -= len1;
}
}
/**
* Read a RTSP message from the server, or prepare to read data
* packets if we're reading data interleaved over the TCP/RTSP
* connection as well.
*
* @param s RTSP demuxer context
* @param reply pointer where the RTSP message header will be stored
* @param content_ptr pointer where the RTSP message body, if any, will
* be stored (length is in \p reply)
* @param return_on_interleaved_data whether the function may return if we
* encounter a data marker ('$'), which precedes data
* packets over interleaved TCP/RTSP connections. If this
* is set, this function will return 1 after encountering
* a '$'. If it is not set, the function will skip any
* data packets (if they are encountered), until a reply
* has been fully parsed. If no more data is available
* without parsing a reply, it will return an error.
*
* @returns 1 if a data packets is ready to be received, -1 on error,
* and 0 on success.
*/
static int
rtsp_read_reply (AVFormatContext *s, RTSPMessageHeader *reply,
unsigned char **content_ptr, int return_on_interleaved_data)
{
RTSPState *rt = s->priv_data;
char buf[4096], buf1[1024], *q;
unsigned char ch;
const char *p;
int ret, content_length, line_count = 0;
unsigned char *content = NULL;
memset(reply, 0, sizeof(*reply));
/* parse reply (XXX: use buffers) */
rt->last_reply[0] = '\0';
for(;;) {
q = buf;
for(;;) {
ret = url_read_complete(rt->rtsp_hd, &ch, 1);
#ifdef DEBUG_RTP_TCP
dprintf(s, "ret=%d c=%02x [%c]\n", ret, ch, ch);
#endif
if (ret != 1)
return -1;
if (ch == '\n')
break;
if (ch == '$') {
/* XXX: only parse it if first char on line ? */
if (return_on_interleaved_data) {
return 1;
} else
rtsp_skip_packet(s);
} else if (ch != '\r') {
if ((q - buf) < sizeof(buf) - 1)
*q++ = ch;
}
}
*q = '\0';
dprintf(s, "line='%s'\n", buf);
/* 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);
av_strlcat(rt->last_reply, p, sizeof(rt->last_reply));
av_strlcat(rt->last_reply, "\n", sizeof(rt->last_reply));
}
line_count++;
}
if (rt->session_id[0] == '\0' && reply->session_id[0] != '\0')
av_strlcpy(rt->session_id, reply->session_id, sizeof(rt->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);
(void)url_read_complete(rt->rtsp_hd, content, content_length);
content[content_length] = '\0';
}
if (content_ptr)
*content_ptr = content;
else
av_free(content);
return 0;
}
static void rtsp_send_cmd_async (AVFormatContext *s,
const char *cmd, RTSPMessageHeader *reply,
unsigned char **content_ptr)
{
RTSPState *rt = s->priv_data;
char buf[4096], buf1[1024];
rt->seq++;
av_strlcpy(buf, cmd, sizeof(buf));
snprintf(buf1, sizeof(buf1), "CSeq: %d\r\n", rt->seq);
av_strlcat(buf, buf1, sizeof(buf));
if (rt->session_id[0] != '\0' && !strstr(cmd, "\nIf-Match:")) {
snprintf(buf1, sizeof(buf1), "Session: %s\r\n", rt->session_id);
av_strlcat(buf, buf1, sizeof(buf));
}
av_strlcat(buf, "\r\n", sizeof(buf));
dprintf(s, "Sending:\n%s--\n", buf);
url_write(rt->rtsp_hd, buf, strlen(buf));
rt->last_cmd_time = av_gettime();
}
static void rtsp_send_cmd (AVFormatContext *s,
const char *cmd, RTSPMessageHeader *reply,
unsigned char **content_ptr)
{
rtsp_send_cmd_async(s, cmd, reply, content_ptr);
rtsp_read_reply(s, reply, content_ptr, 0);
}
/* close and free RTSP streams */
static void rtsp_close_streams(RTSPState *rt)
{
int i;
RTSPStream *rtsp_st;
for(i=0;i<rt->nb_rtsp_streams;i++) {
rtsp_st = rt->rtsp_streams[i];
if (rtsp_st) {
if (rtsp_st->transport_priv) {
if (rt->transport == RTSP_TRANSPORT_RDT)
ff_rdt_parse_close(rtsp_st->transport_priv);
else
rtp_parse_close(rtsp_st->transport_priv);
}
if (rtsp_st->rtp_handle)
url_close(rtsp_st->rtp_handle);
if (rtsp_st->dynamic_handler && rtsp_st->dynamic_protocol_context)
rtsp_st->dynamic_handler->close(rtsp_st->dynamic_protocol_context);
}
}
av_free(rt->rtsp_streams);
if (rt->asf_ctx) {
av_close_input_stream (rt->asf_ctx);
rt->asf_ctx = NULL;
}
}
static int
rtsp_open_transport_ctx(AVFormatContext *s, RTSPStream *rtsp_st)
{
RTSPState *rt = s->priv_data;
AVStream *st = NULL;
/* open the RTP context */
if (rtsp_st->stream_index >= 0)
st = s->streams[rtsp_st->stream_index];
if (!st)
s->ctx_flags |= AVFMTCTX_NOHEADER;
if (rt->transport == RTSP_TRANSPORT_RDT)
rtsp_st->transport_priv = ff_rdt_parse_open(s, st->index,
rtsp_st->dynamic_protocol_context,
rtsp_st->dynamic_handler);
else
rtsp_st->transport_priv = rtp_parse_open(s, st, rtsp_st->rtp_handle,
rtsp_st->sdp_payload_type,
&rtsp_st->rtp_payload_data);
if (!rtsp_st->transport_priv) {
return AVERROR(ENOMEM);
} else if (rt->transport != RTSP_TRANSPORT_RDT) {
if(rtsp_st->dynamic_handler) {
rtp_parse_set_dynamic_protocol(rtsp_st->transport_priv,
rtsp_st->dynamic_protocol_context,
rtsp_st->dynamic_handler);
}
}
return 0;
}
/**
* @returns 0 on success, <0 on error, 1 if protocol is unavailable.
*/
static int
make_setup_request (AVFormatContext *s, const char *host, int port,
int lower_transport, const char *real_challenge)
{
RTSPState *rt = s->priv_data;
int rtx, j, i, err, interleave = 0;
RTSPStream *rtsp_st;
RTSPMessageHeader reply1, *reply = &reply1;
char cmd[2048];
const char *trans_pref;
if (rt->transport == RTSP_TRANSPORT_RDT)
trans_pref = "x-pn-tng";
else
trans_pref = "RTP/AVP";
/* default timeout: 1 minute */
rt->timeout = 60;
/* for each stream, make the setup request */
/* XXX: we assume the same server is used for the control of each
RTSP stream */
for(j = RTSP_RTP_PORT_MIN, i = 0; i < rt->nb_rtsp_streams; ++i) {
char transport[2048];
/**
* WMS serves all UDP data over a single connection, the RTX, which
* isn't necessarily the first in the SDP but has to be the first
* to be set up, else the second/third SETUP will fail with a 461.
*/
if (lower_transport == RTSP_LOWER_TRANSPORT_UDP &&
rt->server_type == RTSP_SERVER_WMS) {
if (i == 0) {
/* rtx first */
for (rtx = 0; rtx < rt->nb_rtsp_streams; rtx++) {
int len = strlen(rt->rtsp_streams[rtx]->control_url);
if (len >= 4 &&
!strcmp(rt->rtsp_streams[rtx]->control_url + len - 4, "/rtx"))
break;
}
if (rtx == rt->nb_rtsp_streams)
return -1; /* no RTX found */
rtsp_st = rt->rtsp_streams[rtx];
} else
rtsp_st = rt->rtsp_streams[i > rtx ? i : i - 1];
} else
rtsp_st = rt->rtsp_streams[i];
/* RTP/UDP */
if (lower_transport == RTSP_LOWER_TRANSPORT_UDP) {
char buf[256];
if (rt->server_type == RTSP_SERVER_WMS && i > 1) {
port = reply->transports[0].client_port_min;
goto have_port;
}
/* first try in specified port range */
if (RTSP_RTP_PORT_MIN != 0) {
while(j <= RTSP_RTP_PORT_MAX) {
snprintf(buf, sizeof(buf), "rtp://%s?localport=%d", host, j);
j += 2; /* we will use two port by rtp stream (rtp and rtcp) */
if (url_open(&rtsp_st->rtp_handle, buf, URL_RDWR) == 0) {
goto rtp_opened;
}
}
}
/* then try on any port
** if (url_open(&rtsp_st->rtp_handle, "rtp://", URL_RDONLY) < 0) {
** err = AVERROR_INVALIDDATA;
** goto fail;
** }
*/
rtp_opened:
port = rtp_get_local_port(rtsp_st->rtp_handle);
have_port:
snprintf(transport, sizeof(transport) - 1,
"%s/UDP;", trans_pref);
if (rt->server_type != RTSP_SERVER_REAL)
av_strlcat(transport, "unicast;", sizeof(transport));
av_strlcatf(transport, sizeof(transport),
"client_port=%d", port);
if (rt->transport == RTSP_TRANSPORT_RTP &&
!(rt->server_type == RTSP_SERVER_WMS && i > 0))
av_strlcatf(transport, sizeof(transport), "-%d", port + 1);
}
/* RTP/TCP */
else if (lower_transport == RTSP_LOWER_TRANSPORT_TCP) {
/** For WMS streams, the application streams are only used for
* UDP. When trying to set it up for TCP streams, the server
* will return an error. Therefore, we skip those streams. */
if (rt->server_type == RTSP_SERVER_WMS &&
s->streams[rtsp_st->stream_index]->codec->codec_type == CODEC_TYPE_DATA)
continue;
snprintf(transport, sizeof(transport) - 1,
"%s/TCP;", trans_pref);
if (rt->server_type == RTSP_SERVER_WMS)
av_strlcat(transport, "unicast;", sizeof(transport));
av_strlcatf(transport, sizeof(transport),
"interleaved=%d-%d",
interleave, interleave + 1);
interleave += 2;
}
else if (lower_transport == RTSP_LOWER_TRANSPORT_UDP_MULTICAST) {
snprintf(transport, sizeof(transport) - 1,
"%s/UDP;multicast", trans_pref);
}
if (rt->server_type == RTSP_SERVER_REAL ||
rt->server_type == RTSP_SERVER_WMS)
av_strlcat(transport, ";mode=play", sizeof(transport));
snprintf(cmd, sizeof(cmd),
"SETUP %s RTSP/1.0\r\n"
"Transport: %s\r\n",
rtsp_st->control_url, transport);
if (i == 0 && rt->server_type == RTSP_SERVER_REAL) {
char real_res[41], real_csum[9];
ff_rdt_calc_response_and_checksum(real_res, real_csum,
real_challenge);
av_strlcatf(cmd, sizeof(cmd),
"If-Match: %s\r\n"
"RealChallenge2: %s, sd=%s\r\n",
rt->session_id, real_res, real_csum);
}
rtsp_send_cmd(s, cmd, reply, NULL);
if (reply->status_code == 461 /* Unsupported protocol */ && i == 0) {
err = 1;
goto fail;
} else 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].lower_transport != rt->lower_transport ||
reply->transports[0].transport != rt->transport) {
err = AVERROR_INVALIDDATA;
goto fail;
}
} else {
rt->lower_transport = reply->transports[0].lower_transport;
rt->transport = reply->transports[0].transport;
}
/* close RTP connection if not choosen */
if (reply->transports[0].lower_transport != RTSP_LOWER_TRANSPORT_UDP &&
(lower_transport == RTSP_LOWER_TRANSPORT_UDP)) {
url_close(rtsp_st->rtp_handle);
rtsp_st->rtp_handle = NULL;
}
switch(reply->transports[0].lower_transport) {
case RTSP_LOWER_TRANSPORT_TCP:
rtsp_st->interleaved_min = reply->transports[0].interleaved_min;
rtsp_st->interleaved_max = reply->transports[0].interleaved_max;
break;
case RTSP_LOWER_TRANSPORT_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 (!(rt->server_type == RTSP_SERVER_WMS && i > 1) &&
rtp_set_remote_url(rtsp_st->rtp_handle, url) < 0) {
err = AVERROR_INVALIDDATA;
goto fail;
}
}
break;
case RTSP_LOWER_TRANSPORT_UDP_MULTICAST:
{
char url[1024];
struct in_addr in;
in.s_addr = htonl(reply->transports[0].destination);
snprintf(url, sizeof(url), "rtp://%s:%d?ttl=%d",
inet_ntoa(in),
reply->transports[0].port_min,
reply->transports[0].ttl);
if (url_open(&rtsp_st->rtp_handle, url, URL_RDWR) < 0) {
err = AVERROR_INVALIDDATA;
goto fail;
}
}
break;
}
if ((err = rtsp_open_transport_ctx(s, rtsp_st)))
goto fail;
}
if (reply->timeout > 0)
rt->timeout = reply->timeout;
if (rt->server_type == RTSP_SERVER_REAL)
rt->need_subscription = 1;
return 0;
fail:
for (i=0; i<rt->nb_rtsp_streams; i++) {
if (rt->rtsp_streams[i]->rtp_handle) {
url_close(rt->rtsp_streams[i]->rtp_handle);
rt->rtsp_streams[i]->rtp_handle = NULL;
}
}
return err;
}
static int rtsp_read_header(AVFormatContext *s,
AVFormatParameters *ap)
{
RTSPState *rt = s->priv_data;
char host[1024], path[1024], tcpname[1024], cmd[2048], *option_list, *option;
URLContext *rtsp_hd;
int port, ret, err;
RTSPMessageHeader reply1, *reply = &reply1;
unsigned char *content = NULL;
int lower_transport_mask = 0;
char real_challenge[64];
/* extract hostname and port */
url_split(NULL, 0, NULL, 0,
host, sizeof(host), &port, path, sizeof(path), s->filename);
if (port < 0)
port = RTSP_DEFAULT_PORT;
/* search for options */
option_list = strchr(path, '?');
if (option_list) {
/* remove the options from the path */
*option_list++ = 0;
while(option_list) {
/* move the option pointer */
option = option_list;
option_list = strchr(option_list, '&');
if (option_list)
*(option_list++) = 0;
/* handle the options */
if (strcmp(option, "udp") == 0)
lower_transport_mask = (1<< RTSP_LOWER_TRANSPORT_UDP);
else if (strcmp(option, "multicast") == 0)
lower_transport_mask = (1<< RTSP_LOWER_TRANSPORT_UDP_MULTICAST);
else if (strcmp(option, "tcp") == 0)
lower_transport_mask = (1<< RTSP_LOWER_TRANSPORT_TCP);
}
}
if (!lower_transport_mask)
lower_transport_mask = (1 << RTSP_LOWER_TRANSPORT_NB) - 1;
/* open the tcp connexion */
snprintf(tcpname, sizeof(tcpname), "tcp://%s:%d", host, port);
if (url_open(&rtsp_hd, tcpname, URL_RDWR) < 0)
return AVERROR(EIO);
rt->rtsp_hd = rtsp_hd;
rt->seq = 0;
/* request options supported by the server; this also detects server type */
for (rt->server_type = RTSP_SERVER_RTP;;) {
snprintf(cmd, sizeof(cmd),
"OPTIONS %s RTSP/1.0\r\n", s->filename);
if (rt->server_type == RTSP_SERVER_REAL)
av_strlcat(cmd,
/**
* The following entries are required for proper
* streaming from a Realmedia server. They are
* interdependent in some way although we currently
* don't quite understand how. Values were copied
* from mplayer SVN r23589.
* @param CompanyID is a 16-byte ID in base64
* @param ClientChallenge is a 16-byte ID in hex
*/
"ClientChallenge: 9e26d33f2984236010ef6253fb1887f7\r\n"
"PlayerStarttime: [28/03/2003:22:50:23 00:00]\r\n"
"CompanyID: KnKV4M4I/B2FjJ1TToLycw==\r\n"
"GUID: 00000000-0000-0000-0000-000000000000\r\n",
sizeof(cmd));
rtsp_send_cmd(s, cmd, reply, NULL);
if (reply->status_code != RTSP_STATUS_OK) {
err = AVERROR_INVALIDDATA;
goto fail;
}
/* detect server type if not standard-compliant RTP */
if (rt->server_type != RTSP_SERVER_REAL && reply->real_challenge[0]) {
rt->server_type = RTSP_SERVER_REAL;
continue;
} else if (!strncasecmp(reply->server, "WMServer/", 9)) {
rt->server_type = RTSP_SERVER_WMS;
} else if (rt->server_type == RTSP_SERVER_REAL) {
strcpy(real_challenge, reply->real_challenge);
}
break;
}
/* describe the stream */
snprintf(cmd, sizeof(cmd),
"DESCRIBE %s RTSP/1.0\r\n"
"Accept: application/sdp\r\n",
s->filename);
if (rt->server_type == RTSP_SERVER_REAL) {
/**
* The Require: attribute is needed for proper streaming from
* Realmedia servers.
*/
av_strlcat(cmd,
"Require: com.real.retain-entity-for-setup\r\n",
sizeof(cmd));
}
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;
}
do {
int lower_transport = ff_log2_tab[lower_transport_mask & ~(lower_transport_mask - 1)];
err = make_setup_request(s, host, port, lower_transport,
rt->server_type == RTSP_SERVER_REAL ?
real_challenge : NULL);
if (err < 0)
goto fail;
lower_transport_mask &= ~(1 << lower_transport);
if (lower_transport_mask == 0 && err == 1) {
err = AVERROR(FF_NETERROR(EPROTONOSUPPORT));
goto fail;
}
} while (err);
rt->state = RTSP_STATE_IDLE;
rt->seek_timestamp = 0; /* default is to start stream at position
zero */
if (ap->initial_pause) {
/* do not start immediately */
} else {
if (rtsp_read_play(s) < 0) {
err = AVERROR_INVALIDDATA;
goto fail;
}
}
return 0;
fail:
rtsp_close_streams(rt);
av_freep(&content);
url_close(rt->rtsp_hd);
return err;
}
static int tcp_read_packet(AVFormatContext *s, RTSPStream **prtsp_st,
uint8_t *buf, int buf_size)
{
RTSPState *rt = s->priv_data;
int id, len, i, ret;
RTSPStream *rtsp_st;
#ifdef DEBUG_RTP_TCP
dprintf(s, "tcp_read_packet:\n");
#endif
redo:
for(;;) {
RTSPMessageHeader reply;
ret = rtsp_read_reply(s, &reply, NULL, 1);
if (ret == -1)
return -1;
if (ret == 1) /* received '$' */
break;
/* XXX: parse message */
}
ret = url_read_complete(rt->rtsp_hd, buf, 3);
if (ret != 3)
return -1;
id = buf[0];
len = AV_RB16(buf + 1);
#ifdef DEBUG_RTP_TCP
dprintf(s, "id=%d len=%d\n", id, len);
#endif
if (len > buf_size || len < 12)
goto redo;
/* get the data */
ret = url_read_complete(rt->rtsp_hd, buf, len);
if (ret != len)
return -1;
if (rt->transport == RTSP_TRANSPORT_RDT &&
ff_rdt_parse_header(buf, len, &id, NULL, NULL, NULL, NULL) < 0)
return -1;
/* find the matching stream */
for(i = 0; i < rt->nb_rtsp_streams; i++) {
rtsp_st = rt->rtsp_streams[i];
if (id >= rtsp_st->interleaved_min &&
id <= rtsp_st->interleaved_max)
goto found;
}
goto redo;
found:
*prtsp_st = rtsp_st;
return len;
}
static int udp_read_packet(AVFormatContext *s, RTSPStream **prtsp_st,
uint8_t *buf, int buf_size)
{
RTSPState *rt = s->priv_data;
RTSPStream *rtsp_st;
fd_set rfds;
int fd, fd_max, n, i, ret, tcp_fd;
struct timeval tv;
for(;;) {
if (url_interrupt_cb())
return AVERROR(EINTR);
FD_ZERO(&rfds);
if (rt->rtsp_hd) {
tcp_fd = fd_max = url_get_file_handle(rt->rtsp_hd);
FD_SET(tcp_fd, &rfds);
} else {
fd_max = 0;
tcp_fd = -1;
}
for(i = 0; i < rt->nb_rtsp_streams; i++) {
rtsp_st = rt->rtsp_streams[i];
if (rtsp_st->rtp_handle) {
/* currently, we cannot probe RTCP handle because of
* blocking restrictions */
fd = url_get_file_handle(rtsp_st->rtp_handle);
if (fd > fd_max)
fd_max = fd;
FD_SET(fd, &rfds);
}
}
tv.tv_sec = 0;
tv.tv_usec = 100 * 1000;
n = select(fd_max + 1, &rfds, NULL, NULL, &tv);
if (n > 0) {
for(i = 0; i < rt->nb_rtsp_streams; i++) {
rtsp_st = rt->rtsp_streams[i];
if (rtsp_st->rtp_handle) {
fd = url_get_file_handle(rtsp_st->rtp_handle);
if (FD_ISSET(fd, &rfds)) {
ret = url_read(rtsp_st->rtp_handle, buf, buf_size);
if (ret > 0) {
*prtsp_st = rtsp_st;
return ret;
}
}
}
}
if (FD_ISSET(tcp_fd, &rfds)) {
RTSPMessageHeader reply;
rtsp_read_reply(s, &reply, NULL, 0);
/* XXX: parse message */
}
}
}
}
static int rtsp_read_packet(AVFormatContext *s,
AVPacket *pkt)
{
RTSPState *rt = s->priv_data;
RTSPStream *rtsp_st;
int ret, len;
uint8_t buf[10 * RTP_MAX_PACKET_LENGTH];
RTSPMessageHeader reply1, *reply = &reply1;
char cmd[1024];
if (rt->server_type == RTSP_SERVER_REAL) {
int i;
enum AVDiscard cache[MAX_STREAMS];
for (i = 0; i < s->nb_streams; i++)
cache[i] = s->streams[i]->discard;
if (!rt->need_subscription) {
if (memcmp (cache, rt->real_setup_cache,
sizeof(enum AVDiscard) * s->nb_streams)) {
av_strlcatf(cmd, sizeof(cmd),
"SET_PARAMETER %s RTSP/1.0\r\n"
"Unsubscribe: %s\r\n",
s->filename, rt->last_subscription);
rtsp_send_cmd(s, cmd, reply, NULL);
if (reply->status_code != RTSP_STATUS_OK)
return AVERROR_INVALIDDATA;
rt->need_subscription = 1;
}
}
if (rt->need_subscription) {
int r, rule_nr, first = 1;
memcpy(rt->real_setup_cache, cache,
sizeof(enum AVDiscard) * s->nb_streams);
rt->last_subscription[0] = 0;
snprintf(cmd, sizeof(cmd),
"SET_PARAMETER %s RTSP/1.0\r\n"
"Subscribe: ",
s->filename);
for (i = 0; i < rt->nb_rtsp_streams; i++) {
rule_nr = 0;
for (r = 0; r < s->nb_streams; r++) {
if (s->streams[r]->priv_data == rt->rtsp_streams[i]) {
if (s->streams[r]->discard != AVDISCARD_ALL) {
if (!first)
av_strlcat(rt->last_subscription, ",",
sizeof(rt->last_subscription));
ff_rdt_subscribe_rule(
rt->last_subscription,
sizeof(rt->last_subscription), i, rule_nr);
first = 0;
}
rule_nr++;
}
}
}
av_strlcatf(cmd, sizeof(cmd), "%s\r\n", rt->last_subscription);
rtsp_send_cmd(s, cmd, reply, NULL);
if (reply->status_code != RTSP_STATUS_OK)
return AVERROR_INVALIDDATA;
rt->need_subscription = 0;
if (rt->state == RTSP_STATE_PLAYING)
rtsp_read_play (s);
}
}
/* get next frames from the same RTP packet */
if (rt->cur_transport_priv) {
if (rt->transport == RTSP_TRANSPORT_RDT)
ret = ff_rdt_parse_packet(rt->cur_transport_priv, pkt, NULL, 0);
else
ret = rtp_parse_packet(rt->cur_transport_priv, pkt, NULL, 0);
if (ret == 0) {
rt->cur_transport_priv = NULL;
return 0;
} else if (ret == 1) {
return 0;
} else {
rt->cur_transport_priv = NULL;
}
}
/* read next RTP packet */
redo:
switch(rt->lower_transport) {
default:
case RTSP_LOWER_TRANSPORT_TCP:
len = tcp_read_packet(s, &rtsp_st, buf, sizeof(buf));
break;
case RTSP_LOWER_TRANSPORT_UDP:
case RTSP_LOWER_TRANSPORT_UDP_MULTICAST:
len = udp_read_packet(s, &rtsp_st, buf, sizeof(buf));
if (len >=0 && rtsp_st->transport_priv && rt->transport == RTSP_TRANSPORT_RTP)
rtp_check_and_send_back_rr(rtsp_st->transport_priv, len);
break;
}
if (len < 0)
return len;
if (rt->transport == RTSP_TRANSPORT_RDT)
ret = ff_rdt_parse_packet(rtsp_st->transport_priv, pkt, buf, len);
else
ret = rtp_parse_packet(rtsp_st->transport_priv, pkt, buf, len);
if (ret < 0)
goto redo;
if (ret == 1) {
/* more packets may follow, so we save the RTP context */
rt->cur_transport_priv = rtsp_st->transport_priv;
}
/* send dummy request to keep TCP connection alive */
if ((rt->server_type == RTSP_SERVER_WMS ||
rt->server_type == RTSP_SERVER_REAL) &&
(av_gettime() - rt->last_cmd_time) / 1000000 >= rt->timeout / 2) {
if (rt->server_type == RTSP_SERVER_WMS) {
snprintf(cmd, sizeof(cmd) - 1,
"GET_PARAMETER %s RTSP/1.0\r\n",
s->filename);
rtsp_send_cmd_async(s, cmd, reply, NULL);
} else {
rtsp_send_cmd_async(s, "OPTIONS * RTSP/1.0\r\n",
reply, NULL);
}
}
return 0;
}
static int rtsp_read_play(AVFormatContext *s)
{
RTSPState *rt = s->priv_data;
RTSPMessageHeader reply1, *reply = &reply1;
char cmd[1024];
av_log(s, AV_LOG_DEBUG, "hello state=%d\n", rt->state);
if (!(rt->server_type == RTSP_SERVER_REAL && rt->need_subscription)) {
if (rt->state == RTSP_STATE_PAUSED) {
snprintf(cmd, sizeof(cmd),
"PLAY %s RTSP/1.0\r\n",
s->filename);
} else {
snprintf(cmd, sizeof(cmd),
"PLAY %s RTSP/1.0\r\n"
"Range: npt=%0.3f-\r\n",
s->filename,
(double)rt->seek_timestamp / AV_TIME_BASE);
}
rtsp_send_cmd(s, cmd, reply, NULL);
if (reply->status_code != RTSP_STATUS_OK) {
return -1;
}
}
rt->state = RTSP_STATE_PLAYING;
return 0;
}
/* pause the stream */
static int rtsp_read_pause(AVFormatContext *s)
{
RTSPState *rt = s->priv_data;
RTSPMessageHeader reply1, *reply = &reply1;
char cmd[1024];
rt = s->priv_data;
if (rt->state != RTSP_STATE_PLAYING)
return 0;
else if (!(rt->server_type == RTSP_SERVER_REAL && rt->need_subscription)) {
snprintf(cmd, sizeof(cmd),
"PAUSE %s RTSP/1.0\r\n",
s->filename);
rtsp_send_cmd(s, cmd, reply, NULL);
if (reply->status_code != RTSP_STATUS_OK) {
return -1;
}
}
rt->state = RTSP_STATE_PAUSED;
return 0;
}
static int rtsp_read_seek(AVFormatContext *s, int stream_index,
int64_t timestamp, int flags)
{
RTSPState *rt = s->priv_data;
rt->seek_timestamp = av_rescale_q(timestamp, s->streams[stream_index]->time_base, AV_TIME_BASE_Q);
switch(rt->state) {
default:
case RTSP_STATE_IDLE:
break;
case RTSP_STATE_PLAYING:
if (rtsp_read_pause(s) != 0)
return -1;
rt->state = RTSP_STATE_SEEKING;
if (rtsp_read_play(s) != 0)
return -1;
break;
case RTSP_STATE_PAUSED:
rt->state = RTSP_STATE_IDLE;
break;
}
return 0;
}
static int rtsp_read_close(AVFormatContext *s)
{
RTSPState *rt = s->priv_data;
RTSPMessageHeader reply1, *reply = &reply1;
char cmd[1024];
#if 0
/* NOTE: it is valid to flush the buffer here */
if (rt->lower_transport == RTSP_LOWER_TRANSPORT_TCP) {
url_fclose(&rt->rtsp_gb);
}
#endif
snprintf(cmd, sizeof(cmd),
"TEARDOWN %s RTSP/1.0\r\n",
s->filename);
rtsp_send_cmd(s, cmd, reply, NULL);
rtsp_close_streams(rt);
url_close(rt->rtsp_hd);
return 0;
}
#if CONFIG_RTSP_DEMUXER
AVInputFormat rtsp_demuxer = {
"rtsp",
NULL_IF_CONFIG_SMALL("RTSP input format"),
sizeof(RTSPState),
rtsp_probe,
rtsp_read_header,
rtsp_read_packet,
rtsp_read_close,
rtsp_read_seek,
.flags = AVFMT_NOFILE,
.read_play = rtsp_read_play,
.read_pause = rtsp_read_pause,
};
#endif
static int sdp_probe(AVProbeData *p1)
{
const char *p = p1->buf, *p_end = p1->buf + p1->buf_size;
/* we look for a line beginning "c=IN IP4" */
while (p < p_end && *p != '\0') {
if (p + sizeof("c=IN IP4") - 1 < p_end && av_strstart(p, "c=IN IP4", NULL))
return AVPROBE_SCORE_MAX / 2;
while(p < p_end - 1 && *p != '\n') p++;
if (++p >= p_end)
break;
if (*p == '\r')
p++;
}
return 0;
}
#define SDP_MAX_SIZE 8192
static int sdp_read_header(AVFormatContext *s,
AVFormatParameters *ap)
{
RTSPState *rt = s->priv_data;
RTSPStream *rtsp_st;
int size, i, err;
char *content;
char url[1024];
/* read the whole sdp file */
/* XXX: better loading */
content = av_malloc(SDP_MAX_SIZE);
size = get_buffer(s->pb, content, SDP_MAX_SIZE - 1);
if (size <= 0) {
av_free(content);
return AVERROR_INVALIDDATA;
}
content[size] ='\0';
sdp_parse(s, content);
av_free(content);
/* open each RTP stream */
for(i=0;i<rt->nb_rtsp_streams;i++) {
rtsp_st = rt->rtsp_streams[i];
snprintf(url, sizeof(url), "rtp://%s:%d?localport=%d&ttl=%d",
inet_ntoa(rtsp_st->sdp_ip),
rtsp_st->sdp_port,
rtsp_st->sdp_port,
rtsp_st->sdp_ttl);
if (url_open(&rtsp_st->rtp_handle, url, URL_RDWR) < 0) {
err = AVERROR_INVALIDDATA;
goto fail;
}
if ((err = rtsp_open_transport_ctx(s, rtsp_st)))
goto fail;
}
return 0;
fail:
rtsp_close_streams(rt);
return err;
}
static int sdp_read_packet(AVFormatContext *s,
AVPacket *pkt)
{
return rtsp_read_packet(s, pkt);
}
static int sdp_read_close(AVFormatContext *s)
{
RTSPState *rt = s->priv_data;
rtsp_close_streams(rt);
return 0;
}
#if CONFIG_SDP_DEMUXER
AVInputFormat sdp_demuxer = {
"sdp",
NULL_IF_CONFIG_SMALL("SDP"),
sizeof(RTSPState),
sdp_probe,
sdp_read_header,
sdp_read_packet,
sdp_read_close,
};
#endif
#if CONFIG_REDIR_DEMUXER
/* dummy redirector format (used directly in av_open_input_file now) */
static int redir_probe(AVProbeData *pd)
{
const char *p;
p = pd->buf;
skip_spaces(&p);
if (av_strstart(p, "http://", NULL) ||
av_strstart(p, "rtsp://", NULL))
return AVPROBE_SCORE_MAX;
return 0;
}
static int redir_read_header(AVFormatContext *s, AVFormatParameters *ap)
{
char buf[4096], *q;
int c;
AVFormatContext *ic = NULL;
ByteIOContext *f = s->pb;
/* 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;
}
if (!ic)
return AVERROR(EIO);
*s = *ic;
url_fclose(f);
return 0;
}
AVInputFormat redir_demuxer = {
"redir",
NULL_IF_CONFIG_SMALL("Redirector format"),
0,
redir_probe,
redir_read_header,
NULL,
NULL,
};
#endif
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