/* macchina a stati dell'rtsp */
void RTSP_state_machine(RTSP_buffer * rtsp, int method)
{
/*
* All state transitions are made here except when the last stream packet
* is sent during a PLAY. That transition is located in stream_event().
*/
char *s;
RTSP_session *p;
long int session_id;
char trash[255];
if ((s = strstr(rtsp->in_buffer, HDR_SESSION)) != NULL) {
if (sscanf(s, "%254s %ld", trash, &session_id) != 2) {
fnc_log(FNC_LOG_INFO,"Invalid Session number in Session header\n");
send_reply(454, 0, rtsp); /* Session Not Found */
return;
}
}
p = rtsp->session_list;
if (p == NULL) {
return;
}
switch (p->cur_state) {
case INIT_STATE:{
switch (method) {
case RTSP_ID_DESCRIBE:
RTSP_describe(rtsp);
break;
case RTSP_ID_SETUP:
if (RTSP_setup(rtsp, &p) == ERR_NOERROR) {
p->cur_state = READY_STATE;
}
break;
case RTSP_ID_TEARDOWN:
// if (RTSP_teardown(rtsp) == ERR_NOERROR) { // shawill
// p->cur_state = INIT_STATE;
// }
RTSP_teardown(rtsp);
break;
case RTSP_ID_OPTIONS:
if (RTSP_options(rtsp) == ERR_NOERROR) {
p->cur_state = INIT_STATE;
}
break;
case RTSP_ID_PLAY: /* method not valid this state. */
case RTSP_ID_PAUSE:
send_reply(455, "Accept: OPTIONS, DESCRIBE, SETUP, TEARDOWN\n", rtsp);
break;
default:
send_reply(501, "Accept: OPTIONS, DESCRIBE, SETUP, TEARDOWN\n", rtsp);
break;
}
break;
} /* INIT state */
case READY_STATE:{
switch (method) {
case RTSP_ID_PLAY:
if (RTSP_play(rtsp) == ERR_NOERROR) {
p->cur_state = PLAY_STATE;
}
break;
case RTSP_ID_SETUP:
if (RTSP_setup(rtsp, &p) == ERR_NOERROR) {
p->cur_state = READY_STATE;
}
break;
case RTSP_ID_TEARDOWN:
// if (RTSP_teardown(rtsp) == ERR_NOERROR) { // shawill
// p->cur_state = INIT_STATE;
// }
RTSP_teardown(rtsp);
break;
case RTSP_ID_OPTIONS:
break;
case RTSP_ID_PAUSE: /* method not valid this state. */
send_reply(455, "Accept: OPTIONS, SETUP, PLAY, TEARDOWN\n", rtsp);
break;
case RTSP_ID_DESCRIBE:
RTSP_describe(rtsp);
break;
default:
send_reply(501, "Accept: OPTIONS, SETUP, PLAY, TEARDOWN\n", rtsp);
break;
}
break;
} /* READY state */
case PLAY_STATE:{
switch (method) {
case RTSP_ID_PLAY:
// Feature not supported
fnc_log(FNC_LOG_INFO,"UNSUPPORTED: Play while playing.\n");
send_reply(551, 0, rtsp); /* Option not supported */
break;
case RTSP_ID_PAUSE:
if (RTSP_pause(rtsp) == ERR_NOERROR) {
p->cur_state = READY_STATE;
}
break;
case RTSP_ID_TEARDOWN:
// if (RTSP_teardown(rtsp) == ERR_NOERROR) { // shawill
// p->cur_state = INIT_STATE;
// }
RTSP_teardown(rtsp);
break;
case RTSP_ID_OPTIONS:
break;
case RTSP_ID_DESCRIBE:
RTSP_describe(rtsp);
break;
case RTSP_ID_SETUP:
break;
}
break;
} /* PLAY state */
default:{ /* invalid/unexpected current state. */
fnc_log(FNC_LOG_ERR,"State error: unknown state=%d, method code=%d\n", p->cur_state, method);
}
break;
} /* end of current state switch */
}
/*rtsp状态机，服务器端*/
void RTSP_state_machine(RTSP_buffer * pRtspBuf, int method)
{
#ifdef RTSP_DEBUG
trace_point();
#endif
/*除了播放过程中发送的最后一个数据流，
*所有的状态迁移都在这里被处理
* 状态迁移位于stream_event中
*/
char *s;
RTSP_session *pRtspSess;
long int session_id;
char trash[255];
char szDebug[255];
/*找到会话位置*/
if ((s = strstr(pRtspBuf->in_buffer, HDR_SESSION)) != NULL)
{
if (sscanf(s, "%254s %ld", trash, &session_id) != 2)
{
fprintf(stderr,"Invalid Session number %s,%i\n", __FILE__, __LINE__);
send_reply(454, 0, pRtspBuf); /* 没有此会话*/
return;
}
}
/*打开会话列表*/
pRtspSess = pRtspBuf->session_list;
if (pRtspSess == NULL)
{
return;
}
#ifdef RTSP_DEBUG
sprintf(szDebug,"state_machine:current state is ");
strcat(szDebug,((pRtspSess->cur_state==0)?"init state":((pRtspSess->cur_state==1)?"ready state":"play state")));
printf("%s\n", szDebug);
#endif
/*根据状态迁移规则，从当前状态开始迁移*/
switch (pRtspSess->cur_state)
{
case INIT_STATE: /*初始态*/
{
#ifdef RTSP_DEBUG
fprintf(stderr,"current method code is: %d \n",method);
#endif
switch (method)
{
case RTSP_ID_DESCRIBE: //状态不变
RTSP_describe(pRtspBuf);
//printf("3\r\n");
break;
case RTSP_ID_SETUP: //状态变为就绪态
//printf("4\r\n");
if (RTSP_setup(pRtspBuf) == ERR_NOERROR)
{
//printf("5\r\n");
pRtspSess->cur_state = READY_STATE;
fprintf(stderr,"TRANSFER TO READY STATE!\n");
}
break;
case RTSP_ID_TEARDOWN: //状态不变
RTSP_teardown(pRtspBuf);
break;
case RTSP_ID_OPTIONS:
if (RTSP_options(pRtspBuf) == ERR_NOERROR)
{
pRtspSess->cur_state = INIT_STATE; //状态不变
}
break;
case RTSP_ID_PLAY: //method not valid this state.
case RTSP_ID_PAUSE:
send_reply(455, 0, pRtspBuf);
break;
default:
send_reply(501, 0, pRtspBuf);
break;
}
break;
}
case READY_STATE:
{
#ifdef RTSP_DEBUG
fprintf(stderr,"current method code is:%d\n",method);
#endif
switch (method)
{
case RTSP_ID_PLAY: //状态迁移为播放态
if (RTSP_play(pRtspBuf) == ERR_NOERROR)
{
fprintf(stderr,"\tStart Playing!\n");
pRtspSess->cur_state = PLAY_STATE;
}
break;
case RTSP_ID_SETUP:
if (RTSP_setup(pRtspBuf) == ERR_NOERROR) //状态不变
{
pRtspSess->cur_state = READY_STATE;
}
break;
case RTSP_ID_TEARDOWN:
RTSP_teardown(pRtspBuf); //状态变为初始态 ?
break;
case RTSP_ID_OPTIONS:
if (RTSP_options(pRtspBuf) == ERR_NOERROR)
{
pRtspSess->cur_state = INIT_STATE; //状态不变
}
break;
case RTSP_ID_PAUSE: // method not valid this state.
send_reply(455, 0, pRtspBuf);
break;
case RTSP_ID_DESCRIBE:
RTSP_describe(pRtspBuf);
break;
default:
send_reply(501, 0, pRtspBuf);
break;
}
break;
}
case PLAY_STATE:
{
switch (method)
{
case RTSP_ID_PLAY:
// Feature not supported
fprintf(stderr,"UNSUPPORTED: Play while playing.\n");
send_reply(551, 0, pRtspBuf); // Option not supported
break;
/* //不支持暂停命令
case RTSP_ID_PAUSE: //状态变为就绪态
if (RTSP_pause(pRtspBuf) == ERR_NOERROR)
{
pRtspSess->cur_state = READY_STATE;
}
break;
*/
case RTSP_ID_TEARDOWN:
RTSP_teardown(pRtspBuf); //状态迁移为初始态
break;
case RTSP_ID_OPTIONS:
break;
case RTSP_ID_DESCRIBE:
RTSP_describe(pRtspBuf);
break;
case RTSP_ID_SETUP:
break;
}
break;
}/* PLAY state */
default:
{
/* invalid/unexpected current state. */
fprintf(stderr,"%s State error: unknown state=%d, method code=%d\n", __FUNCTION__, pRtspSess->cur_state, method);
}
break;
}/* end of current state switch */
#ifdef RTSP_DEBUG
printf("leaving rtsp_state_machine!\n");
#endif
}