/*
* process rtsp header coming among rtsp real media packet
*
* return value: status code ... normal proceed case
* 0 ... EOF packet (not possible)
* -1 ... error
*/
static int real_process_header(struct stream_t *stream)
{
struct stream_ctrl_t *stream_ctrl = stream->stream_ctrl;
struct rtsp_ctrl_t *rtsp_ctrl = stream_ctrl->rtsp_ctrl;
struct rtsp_header_t *rtsp_hdr = NULL;
int status_code = 0;
int bodylen = 0;
uint8_t *body = NULL;
char *field = NULL;
int got_cseq = 0;
rtsp_hdr = new_rtsp_header();
status_code = rtsp_recv_header(stream,rtsp_hdr);
if(status_code < 0) {
goto failed;
}
/* get content length data */
if((field = rtsp_get_field(rtsp_hdr,"Content-length")) != NULL) {
while(*field == ' ') field++;
bodylen = atoi(field);
body = (uint8_t *)xmalloc(bodylen);
bodylen = read_data(stream,body,bodylen);
}
/* get Cseq, for sending OK back */
if((field = rtsp_get_field(rtsp_hdr,"Cseq")) != NULL) {
while(*field == ' ') field++;
got_cseq = atoi(field);
}
if(!strncmp(rtsp_hdr->protocol,"RTSP",4)) { /* RTSP/1.0 200 OK , ignore this */
/*
somehow RTSP message reply can be found among rdt messages.
send nothing.
*/
if(!got_cseq == rtsp_ctrl->cseq - 1) {
display(MSDL_DBG,"CSeq mismatch: expected %d, got %d",
rtsp_ctrl->cseq - 1,got_cseq);
}
/* DO NOT send RTSP OK */
}
else { /* not RTSP, whatever it is, send OK would be just fine */
rtsp_200ok(stream,got_cseq,rtsp_ctrl->session);
}
if(rtsp_hdr) free_rtsp_header(rtsp_hdr);
if(body) free(body);
return status_code;
failed:
if(body) free(body);
if(rtsp_hdr) free_rtsp_header(rtsp_hdr);
return -1;
}
/*
* find Content-Length field in rtsp_hdr, and read (and trash) following data
* return value: bytes received and discarded
* -1 ... failed
*/
int rtsp_ignore_data_after_header(struct stream_t *stream,struct rtsp_header_t *rtsp_hdr)
{
char *field = NULL;
int body_left = 0;
if((field = rtsp_get_field(rtsp_hdr,"Content-Length")) != NULL) {
uint8_t *ignorebuf = NULL;
while(*field == ' ') field++;
body_left = atoi(field);
if(body_left) {
ignorebuf = xmalloc(body_left);
if(read_data(stream,ignorebuf,body_left) <= 0) {
free(ignorebuf);
goto failed;
}
free(ignorebuf);
}
}
return body_left;
failed:
return -1;
}
/*
* parse rtsp response
* return value: 1 ... success
* -1 ... parse error
*/
int rtsp_parse_response(struct rtsp_ctrl_t *rtsp_ctrl,
struct rtsp_header_t *rtsp_hdr)
{
char *field;
int answer_cseq;
if((field = rtsp_get_field(rtsp_hdr,"Alert")) != NULL) {
display(MSDL_ERR,"*** Alert ***\n%s\n",field);
}
if((field = rtsp_get_field(rtsp_hdr,"Cseq")) != NULL) {
sscanf(field,"%d",&answer_cseq);
if(answer_cseq != rtsp_ctrl->cseq - 1) {
/* -1 because cseq is incremented in build_request */
display(MSDL_DBG,"warning: Cseq mismatch, got %u, expected %u\n",
answer_cseq,rtsp_ctrl->cseq - 1);
}
}
if((field = rtsp_get_field(rtsp_hdr,"Server")) != NULL) {
while(*field == ' ') field++;
if(rtsp_ctrl->server) { /* already has it */
if(strcmp(rtsp_ctrl->server,field)) { /* different server */
display(MSDL_DBG,"warning: got different server\n"
" old: %s\n"
" new: %s\n",rtsp_ctrl->server,field);
free(rtsp_ctrl->server);
rtsp_ctrl->server = strdup(field);
}
}
else { /* not set yet */
rtsp_ctrl->server = strdup(field);
}
}
if((field = rtsp_get_field(rtsp_hdr,"Session")) != NULL) {
while(*field == ' ') field++;
if(rtsp_ctrl->session) {
if(strcmp(rtsp_ctrl->session,field)) { /* different session */
display(MSDL_DBG,"warning: got different session\n"
" old: [%s]\n"
" new: [%s]\n",rtsp_ctrl->session,field);
free(rtsp_ctrl->session);
rtsp_ctrl->session = strdup(field);
}
}
else {
rtsp_ctrl->session = strdup(field);
}
}
/* real only, ignore in other protocol... */
if((field = rtsp_get_field(rtsp_hdr,"RealChallenge1")) != NULL) {
while(*field == ' ') field++;
if(rtsp_ctrl->challenge) {
if(strcmp(rtsp_ctrl->challenge,field)) { /* different server */
display(MSDL_DBG,"warning: got different client challenge\n"
" old: %s\n"
" new: %s\n",rtsp_ctrl->challenge,field);
free(rtsp_ctrl->challenge);
rtsp_ctrl->challenge = strdup(field);
}
}
else {
rtsp_ctrl->challenge = strdup(field);
}
}
return 1;
}
/*
* start rtsp streaming.
*
* return value : negative or 0 ... error
* 1 ... success
*/
int rtsp_streaming_start(struct stream_t *stream)
{
struct rtsp_header_t *rtsp_answer = NULL;
int header_size;
char *answer = NULL; /* temporary pointer */
char *server = NULL;
char *redirected = NULL;
stream->stream_ctrl->status = STREAMING_HANDSHAKING;
if(stream->dlopts->dl_protocol == RTSP_WMS) {
server = strdup("WMServer");
}
else { /* still don't know which rtsp protocol, or REAL specified (need challenge) */
stream->netsock->sock = rtsp_connect(stream);
if(stream->netsock->sock < 0) {
display(MSDL_ERR,"cannot establish rtsp connection\n");
goto failed;
}
real_rtsp_options(stream,&rtsp_answer);
if(rtsp_answer == NULL) {
display(MSDL_ERR,"rtsp connection failed\n");
goto failed;
}
/* get server name */
if((answer = rtsp_get_field(rtsp_answer,"Server")) != NULL) {
while(*answer == ' ') answer++; /* skip space */
server = strdup(answer);
}
else {
if((rtsp_get_field(rtsp_answer,"RealChallenge1")) != NULL) {
server = strdup("Real");
}
else {
server = strdup("Unknown Server");
}
}
}
/* real or helix server (supported) */
if(strstr(server,"Real") || strstr(server,"Helix")) {
/* real-rtsp */
struct rmff_header_t *rmff_header = NULL;
int ret = 0;
/* connection is already setup, by real_rtsp_options called above */
/* this is the function to do almost all setup process */
ret = real_setup_and_get_header(stream,&rmff_header);
if((!rmff_header) || (ret <= 0)) { /* NOT OK */
if((answer = rtsp_get_field(rtsp_answer,"Location")) != NULL) {
/* redirected */
while(*answer == ' ') answer++;
redirected = strdup(answer);
display(MSDL_NOR,"redirected to %s\n",redirected);
/*
TODO redirection support
and I have never seen example...
*/
goto failed;
}
else {
display(MSDL_ERR,"real/helix connection not established\n");
goto failed;
}
}
/* OK, connection established */
header_size = rmff_dump_header(rmff_header,
stream->stream_ctrl->write_buffer);
stream->stream_ctrl->write_data_len = header_size;
display(MSDL_VER,"rmff_header_size = %d\n",header_size);
/* All Green */
stream->stream_ctrl->rtsp_ctrl->rmff_header = rmff_header;
stream->stream_ctrl->file_size = rmff_header->data->size;
stream->stream_ctrl->total_packets = rmff_header->data->num_packets;
stream->stream_ctrl->rtsp_ctrl->get_media_packet = real_rdt_get_media_packet;
/* to distinguish which rtsp */
stream->stream_ctrl->rtsp_ctrl->rtsp_protocol = RTSP_REAL_PROTOCOL;
/* for msdl function to know protocol */
stream->stream_ctrl->protocol = RTSP_REAL;
}
else if(strstr(server,"WMServer")) {
/* try rtsp-wms */
struct asf_headerinfo_t *asf_headerinfo = NULL;
int ret = 0;
/*
* Clean up first.
*/
if(stream->netsock->sock) {
close(stream->netsock->sock);
}
/* free rtsp_ctrl_t */
free_rtsp_ctrl_t(stream->stream_ctrl->rtsp_ctrl);
stream->stream_ctrl->rtsp_ctrl = new_rtsp_ctrl_t();
/* free serverinfo_t */
free_serverinfo_t(stream->serverinfo);
stream->serverinfo = new_serverinfo_t();
/* DO NOT MESS WITH
* stream_t->netsock,
* stream_t->url,
* stream_t->dlopts,
* stream_t->resumeinfo,
* these are still valid (or just nothing (resumeinfo))
*/
/* re-establish rtsp connection for WMServer */
stream->netsock->sock = rtsp_connect(stream);
if(stream->netsock->sock < 0) {
/*
couldn't connect for some reason.
(rtsp port probably closed)
*/
display(MSDL_ERR,"rtsp-wms connection not established\n");
display(MSDL_ERR,"server probably does not accept rtsp\n"
"retry using mmst protocol\n");
stream->stream_ctrl->status = STREAMING_OTHER_PROTOCOL;
stream->stream_ctrl->retry_protocol = MMST;
goto failed;
}
ret = wmserver_setup_and_get_header(stream,&asf_headerinfo);
if(ret == 0) { /* retry */
/* probably non-wmserver */
display(MSDL_ERR,"server probably does not accept rtsp\n"
"retry using mmst protocol\n",server);
stream->stream_ctrl->status = STREAMING_OTHER_PROTOCOL;
stream->stream_ctrl->retry_protocol = MMST;
goto failed;
}
else if((!asf_headerinfo) || (ret < 0)) { /* no retry */
display(MSDL_ERR,"rtsp setup failed\n");
goto failed;
}
/* All Green */
stream->stream_ctrl->rtsp_ctrl->asf_headerinfo = asf_headerinfo; /* set infomation */
stream->stream_ctrl->packet_length = asf_headerinfo->fileh->max_packet_size;
stream->stream_ctrl->file_size = asf_headerinfo->fileh->file_size;
stream->stream_ctrl->total_packets = asf_headerinfo->fileh->num_packets;
stream->stream_ctrl->rtsp_ctrl->get_media_packet = wmserver_rtp_get_media_packet;
/* distinguish which rtsp */
stream->stream_ctrl->rtsp_ctrl->rtsp_protocol = RTSP_WMS_PROTOCOL;
/* for msdl function to know protocol */
stream->stream_ctrl->protocol = RTSP_WMS;
}
else { /* unsupported servers */
display(MSDL_ERR,"server type [%s] not supported\n",server);
stream->stream_ctrl->rtsp_ctrl->rtsp_protocol = RTSP_UNKNOWN_PROTOCOL;
goto failed;
}
if(server) free(server);
if(rtsp_answer) free_rtsp_header(rtsp_answer);
if(redirected) free(redirected);
stream->stream_ctrl->status = STREAMING_DOWNLOADING;
return 1; /* success */
failed:
if(server) free(server);
if(rtsp_answer) free_rtsp_header(rtsp_answer);
if(redirected) free(redirected);
return -1;
}
/*
* send PLAY request
* return value ... what rtsp_recv_header returned
*/
static int real_rtsp_play(struct stream_t *stream)
{
struct rtsp_ctrl_t *rtsp_ctrl = stream->stream_ctrl->rtsp_ctrl;
struct rtsp_header_t *rtsp_hdr = NULL;
char *field = NULL;
int ret = 0;
/*
* Sending part
*/
rtsp_hdr = new_rtsp_header_with_standard_fields(rtsp_ctrl);
if(stream->dlopts->resume_download) {
real_prepare_resuming(stream);
}
if(stream->dlopts->bandwidth) { /* when user specified bandwidth */
char *buffer = (char *)xmalloc(BUFSIZE_1K);
snprintf(buffer,BUFSIZE_1K - 1,
"Bandwidth: %d",stream->dlopts->bandwidth);
rtsp_set_field(rtsp_hdr,buffer);
free(buffer);
}
rtsp_set_range_field(rtsp_hdr,stream->dlopts->range);
rtsp_set_speed_field(rtsp_hdr,stream->dlopts->speed);
rtsp_request_play(rtsp_hdr,rtsp_ctrl->mrl);
rtsp_send_request_and_free(stream,rtsp_hdr);
/*
* Receiving part
*/
/* receive message for PLAY request */
rtsp_hdr = new_rtsp_header();
ret = rtsp_recv_header(stream,rtsp_hdr);
if(!is_rtsp_response_ok(rtsp_hdr->status_code)) {
display(MSDL_ERR,"PLAY request returned: %d (%s)\n",
rtsp_hdr->status_code,rtsp_hdr->reason_phrase);
field = rtsp_get_field(rtsp_hdr,"Alert");
if(field) {
while(*field == ' ') field++;
display(MSDL_ERR,"message from server --> %s\n",field);
}
free_rtsp_header(rtsp_hdr);
goto failed;
}
/* display real speed (might differ from user requested) */
if((field = rtsp_get_field(rtsp_hdr,"Speed")) != NULL) {
if(stream->dlopts->speed) {
while(*field == ' ') field++;
display(MSDL_NOR,"Speed: %s\n",field);
}
}
if((field = rtsp_get_field(rtsp_hdr,"Range")) != NULL) {
if(stream->dlopts->range) {
while(*field == ' ') field++;
display(MSDL_NOR,"Range: %s\n",field);
}
}
/* skip content-length bytes from network */
rtsp_ignore_data_after_header(stream,rtsp_hdr);
free_rtsp_header(rtsp_hdr);
return ret;
failed:
return -1;
}
/*
* send DESCRIBE request
* return value: -1: failure status_code: success
*/
static int real_rtsp_describe(struct stream_t *stream,char **description_ret)
{
struct stream_ctrl_t *stream_ctrl = stream->stream_ctrl;
struct rtsp_ctrl_t *rtsp_ctrl = stream_ctrl->rtsp_ctrl;
struct rtsp_header_t *rtsp_hdr = NULL;
char *description = NULL;
char *buffer = (char *)xmalloc(BUFSIZE_1K);
char *field = NULL;
int len = 0;
int ret = 0;
rtsp_hdr = new_rtsp_header_with_standard_fields(rtsp_ctrl);
rtsp_set_field(rtsp_hdr, "Accept: application/sdp");
rtsp_set_field(rtsp_hdr, real_useragent);
rtsp_set_field(rtsp_hdr, "Require: com.real.retain-entity-for-setup");
snprintf(buffer,BUFSIZE_1K - 1,"Bandwidth: %u",stream_ctrl->bandwidth);
rtsp_set_field(rtsp_hdr,buffer);
rtsp_set_field(rtsp_hdr, "Language: en-US");
rtsp_set_field(rtsp_hdr, "RegionData: 0");
rtsp_set_field(rtsp_hdr, real_clientid);
rtsp_set_field(rtsp_hdr, "GUID: 00000000-0000-0000-0000-000000000000");
rtsp_set_field(rtsp_hdr, "SupportsMaximumASMBandwidth: 1");
rtsp_request_describe(rtsp_hdr,rtsp_ctrl->mrl);
rtsp_send_request_and_free(stream,rtsp_hdr);
rtsp_hdr = new_rtsp_header();
ret = rtsp_recv_header(stream,rtsp_hdr);
if(ret < 0) {
free_rtsp_header(rtsp_hdr);
goto failed;
}
/* NOT OK */
if(!is_rtsp_response_ok(rtsp_hdr->status_code)) {
display(MSDL_ERR,"DESCRIBE request returned: %d (%s)\n",
rtsp_hdr->status_code,rtsp_hdr->reason_phrase);
field = rtsp_get_field(rtsp_hdr,"Alert");
if(field) {
while(*field == ' ') field++;
display(MSDL_ERR,"message from server --> %s\n",field);
}
free_rtsp_header(rtsp_hdr);
goto failed;
}
len = 0;
/* Content-length must be present */
if((field = rtsp_get_field(rtsp_hdr,"Content-length")) != NULL) {
while(*field == ' ') field++;
len = atoi(field);
}
else { /* no Content-length */
display(MSDL_ERR,"warning: No Content-length in fields!!\n");
}
if((field = rtsp_get_field(rtsp_hdr,"ETag")) != NULL) {
while(*field == ' ') field++;
rtsp_ctrl->etag = strdup(field);
}
else {
display(MSDL_ERR,"warning: No ETag!!\n");
rtsp_ctrl->etag = NULL;
}
free_rtsp_header(rtsp_hdr);
/*
copy description (sdp)
*/
description = (char *)xmalloc(len + 1);
if(read_data(stream,(uint8_t *)description,len) < 0) {
goto failed;
}
description[len] = '\0';
display(MSDL_DBG,"==================\n%s\n=(%d bytes)========\n",
description,(int)strlen(description));
if(buffer) free(buffer);
*description_ret = description;
return ret;
failed:
if(description) free(description);
if(buffer) free(buffer);
*description_ret = NULL;
return -1;
}