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Implement RTSP/Realmedia-compatible OPTIONS command. See "Realmedia patch" 

thread on mailinglist for discussion. This patch also implements a
RTSPServerType enum, which allows the RTSP to keep track of what kind of a
stream we're handling: standard-compliant RTP or a proprietary derivative.
This will be used in subsequent patches to implement more Realmedia-specific
extensions required to receive and parse data coming from a Realmedia server.

Originally committed as revision 15104 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Ronald S. Bultje 2008-08-31 03:12:13 +00:00
parent 1f6a594de4
commit 158efd74fe
2 changed files with 48 additions and 0 deletions
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47
libavformat/rtsp.c
View File

@ -42,6 +42,12 @@ enum RTSPClientState {
RTSP_STATE_PAUSED,
};
enum RTSPServerType {
RTSP_SERVER_RTP, /*< Standard-compliant RTP-server */
RTSP_SERVER_RDT, /*< Realmedia-style server */
RTSP_SERVER_LAST
};
typedef struct RTSPState {
URLContext *rtsp_hd; /* RTSP TCP connexion handle */
int nb_rtsp_streams;
@ -55,6 +61,7 @@ typedef struct RTSPState {
int seq; /* RTSP command sequence number */
char session_id[512];
enum RTSPProtocol protocol;
enum RTSPServerType server_type;
char last_reply[2048]; /* XXX: allocate ? */
RTPDemuxContext *cur_rtp;
} RTSPState;
@ -710,6 +717,9 @@ void rtsp_parse_line(RTSPHeader *reply, const char *buf)
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));
}
}
@ -1035,6 +1045,7 @@ static int rtsp_read_header(AVFormatContext *s,
RTSPHeader reply1, *reply = &reply1;
unsigned char *content = NULL;
int protocol_mask = 0;
char real_challenge[64];
/* extract hostname and port */
url_split(NULL, 0, NULL, 0,
@ -1073,6 +1084,42 @@ static int rtsp_read_header(AVFormatContext *s,
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_RDT)
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_RDT && reply->real_challenge[0]) {
rt->server_type = RTSP_SERVER_RDT;
continue;
} else if (rt->server_type == RTSP_SERVER_RDT) {
strcpy(real_challenge, reply->real_challenge);
}
break;
}
/* describe the stream */
snprintf(cmd, sizeof(cmd),
"DESCRIBE %s RTSP/1.0\r\n"

1
libavformat/rtsp.h
View File

@ -62,6 +62,7 @@ typedef struct RTSPHeader {
RTSPTransportField transports[RTSP_MAX_TRANSPORTS];
int seq; /**< sequence number */
char session_id[512];
char real_challenge[64]; /**< the RealChallenge1 field from the server */
} RTSPHeader;
/** the callback can be used to extend the connection setup/teardown step */