rtp.c

uclinux 下的vlc播放器源代码

    if( ( f = utf8_fopen( p_sys->psz_sdp_file, "wt" ) ) == NULL )
    {
        msg_Err( p_stream, "cannot open file '%s' (%s)",
                 p_sys->psz_sdp_file, strerror(errno) );
        return VLC_EGENERIC;
    }

    fprintf( f, "%s", p_sys->psz_sdp );
    fclose( f );

    return VLC_SUCCESS;
}

/****************************************************************************
 * HTTP:
 ****************************************************************************/
static int  HttpCallback( httpd_file_sys_t *p_args,
                          httpd_file_t *, uint8_t *p_request,
                          uint8_t **pp_data, int *pi_data );

static int HttpSetup( sout_stream_t *p_stream, vlc_url_t *url)
{
    sout_stream_sys_t *p_sys = p_stream->p_sys;

    p_sys->p_httpd_host = httpd_HostNew( VLC_OBJECT(p_stream), url->psz_host, url->i_port > 0 ? url->i_port : 80 );
    if( p_sys->p_httpd_host )
    {
        p_sys->p_httpd_file = httpd_FileNew( p_sys->p_httpd_host,
                                             url->psz_path ? url->psz_path : "/",
                                             "application/sdp",
                                             NULL, NULL, NULL,
                                             HttpCallback, (void*)p_sys );
    }
    if( p_sys->p_httpd_file == NULL )
    {
        return VLC_EGENERIC;
    }
    return VLC_SUCCESS;
}

static int  HttpCallback( httpd_file_sys_t *p_args,
                          httpd_file_t *f, uint8_t *p_request,
                          uint8_t **pp_data, int *pi_data )
{
    sout_stream_sys_t *p_sys = (sout_stream_sys_t*)p_args;

    vlc_mutex_lock( &p_sys->lock_sdp );
    if( p_sys->psz_sdp && *p_sys->psz_sdp )
    {
        *pi_data = strlen( p_sys->psz_sdp );
        *pp_data = malloc( *pi_data );
        memcpy( *pp_data, p_sys->psz_sdp, *pi_data );
    }
    else
    {
        *pp_data = NULL;
        *pi_data = 0;
    }
    vlc_mutex_unlock( &p_sys->lock_sdp );

    return VLC_SUCCESS;
}

/****************************************************************************
 * RTSP:
 ****************************************************************************/
static rtsp_client_t *RtspClientNew( sout_stream_t *p_stream, char *psz_session )
{
    rtsp_client_t *rtsp = malloc( sizeof( rtsp_client_t ));

    rtsp->psz_session = psz_session;
    rtsp->i_last = 0;
    rtsp->b_playing = VLC_FALSE;
    rtsp->i_id = 0;
    rtsp->id = NULL;
    rtsp->i_access = 0;
    rtsp->access = NULL;

    TAB_APPEND( p_stream->p_sys->i_rtsp, p_stream->p_sys->rtsp, rtsp );

    return rtsp;
}
static rtsp_client_t *RtspClientGet( sout_stream_t *p_stream, char *psz_session )
{
    int i;

    if( !psz_session ) return NULL;

    for( i = 0; i < p_stream->p_sys->i_rtsp; i++ )
    {
        if( !strcmp( p_stream->p_sys->rtsp[i]->psz_session, psz_session ) )
        {
            return p_stream->p_sys->rtsp[i];
        }
    }
    return NULL;
}

static void RtspClientDel( sout_stream_t *p_stream, rtsp_client_t *rtsp )
{
    int i;
    TAB_REMOVE( p_stream->p_sys->i_rtsp, p_stream->p_sys->rtsp, rtsp );

    for( i = 0; i < rtsp->i_access; i++ )
    {
        sout_AccessOutDelete( rtsp->access[i] );
    }
    if( rtsp->id )     free( rtsp->id );
    if( rtsp->access ) free( rtsp->access );

    free( rtsp->psz_session );
    free( rtsp );
}

static int RtspSetup( sout_stream_t *p_stream, vlc_url_t *url )
{
    sout_stream_sys_t *p_sys = p_stream->p_sys;

    msg_Dbg( p_stream, "rtsp setup: %s : %d / %s\n", url->psz_host, url->i_port, url->psz_path );

    p_sys->p_rtsp_host = httpd_HostNew( VLC_OBJECT(p_stream), url->psz_host, url->i_port > 0 ? url->i_port : 554 );
    if( p_sys->p_rtsp_host == NULL )
    {
        return VLC_EGENERIC;
    }

    p_sys->psz_rtsp_path = strdup( url->psz_path ? url->psz_path : "/" );
    p_sys->psz_rtsp_control = malloc (strlen( url->psz_host ) + 20 + strlen( p_sys->psz_rtsp_path ) + 1 );
    sprintf( p_sys->psz_rtsp_control, "rtsp://%s:%d%s",
             url->psz_host,  url->i_port > 0 ? url->i_port : 554, p_sys->psz_rtsp_path );

    p_sys->p_rtsp_url = httpd_UrlNewUnique( p_sys->p_rtsp_host, p_sys->psz_rtsp_path, NULL, NULL, NULL );
    if( p_sys->p_rtsp_url == 0 )
    {
        return VLC_EGENERIC;
    }
    httpd_UrlCatch( p_sys->p_rtsp_url, HTTPD_MSG_DESCRIBE, RtspCallback, (void*)p_stream );
    httpd_UrlCatch( p_sys->p_rtsp_url, HTTPD_MSG_PLAY,     RtspCallback, (void*)p_stream );
    httpd_UrlCatch( p_sys->p_rtsp_url, HTTPD_MSG_PAUSE,    RtspCallback, (void*)p_stream );
    httpd_UrlCatch( p_sys->p_rtsp_url, HTTPD_MSG_TEARDOWN, RtspCallback, (void*)p_stream );

    return VLC_SUCCESS;
}

static int  RtspCallback( httpd_callback_sys_t *p_args,
                          httpd_client_t *cl,
                          httpd_message_t *answer, httpd_message_t *query )
{
    sout_stream_t *p_stream = (sout_stream_t*)p_args;
    sout_stream_sys_t *p_sys = p_stream->p_sys;
    char *psz_destination = p_sys->psz_destination;
    char *psz_session = NULL;
    char *psz_cseq = NULL;
    int i_cseq = 0;

    if( answer == NULL || query == NULL )
    {
        return VLC_SUCCESS;
    }
    //fprintf( stderr, "RtspCallback query: type=%d\n", query->i_type );

    answer->i_proto = HTTPD_PROTO_RTSP;
    answer->i_version= query->i_version;
    answer->i_type   = HTTPD_MSG_ANSWER;

    switch( query->i_type )
    {
        case HTTPD_MSG_DESCRIBE:
        {
            char *psz_sdp = SDPGenerate( p_stream, psz_destination ? psz_destination : "0.0.0.0", VLC_TRUE );

            answer->i_status = 200;
            answer->psz_status = strdup( "OK" );
            httpd_MsgAdd( answer, "Content-type",  "%s", "application/sdp" );

            answer->p_body = (uint8_t *)psz_sdp;
            answer->i_body = strlen( psz_sdp );
            break;
        }

        case HTTPD_MSG_PLAY:
        {
            rtsp_client_t *rtsp;
            /* for now only multicast so easy */
            answer->i_status = 200;
            answer->psz_status = strdup( "OK" );
            answer->i_body = 0;
            answer->p_body = NULL;

            psz_session = httpd_MsgGet( query, "Session" );
            rtsp = RtspClientGet( p_stream, psz_session );
            if( rtsp && !rtsp->b_playing )
            {
                int i_id;
                /* FIXME */
                rtsp->b_playing = VLC_TRUE;

                vlc_mutex_lock( &p_sys->lock_es );
                for( i_id = 0; i_id < rtsp->i_id; i_id++ )
                {
                    sout_stream_id_t *id = rtsp->id[i_id];
                    int i;

                    for( i = 0; i < p_sys->i_es; i++ )
                    {
                        if( id == p_sys->es[i] )
                            break;
                    }
                    if( i >= p_sys->i_es ) continue;

                    vlc_mutex_lock( &id->lock_rtsp );
                    TAB_APPEND( id->i_rtsp_access, id->rtsp_access, rtsp->access[i_id] );
                    vlc_mutex_unlock( &id->lock_rtsp );
                }
                vlc_mutex_unlock( &p_sys->lock_es );
            }
            break;
        }
        case HTTPD_MSG_PAUSE:
            /* FIXME */
            return VLC_EGENERIC;
        case HTTPD_MSG_TEARDOWN:
        {
            rtsp_client_t *rtsp;

            /* for now only multicast so easy again */
            answer->i_status = 200;
            answer->psz_status = strdup( "OK" );
            answer->i_body = 0;
            answer->p_body = NULL;

            psz_session = httpd_MsgGet( query, "Session" );
            rtsp = RtspClientGet( p_stream, psz_session );
            if( rtsp )
            {
                int i_id;

                vlc_mutex_lock( &p_sys->lock_es );
                for( i_id = 0; i_id < rtsp->i_id; i_id++ )
                {
                    sout_stream_id_t *id = rtsp->id[i_id];
                    int i;

                    for( i = 0; i < p_sys->i_es; i++ )
                    {
                        if( id == p_sys->es[i] )
                            break;
                    }
                    if( i >= p_sys->i_es ) continue;

                    vlc_mutex_lock( &id->lock_rtsp );
                    TAB_REMOVE( id->i_rtsp_access, id->rtsp_access, rtsp->access[i_id] );
                    vlc_mutex_unlock( &id->lock_rtsp );
                }
                vlc_mutex_unlock( &p_sys->lock_es );

                RtspClientDel( p_stream, rtsp );
            }
            break;
        }

        default:
            return VLC_EGENERIC;
    }
    httpd_MsgAdd( answer, "Server", PACKAGE_STRING );
    httpd_MsgAdd( answer, "Content-Length", "%d", answer->i_body );
    psz_cseq = httpd_MsgGet( query, "Cseq" );
    if( psz_cseq )
        i_cseq = atoi( psz_cseq );
    else
        i_cseq = 0;
    httpd_MsgAdd( answer, "Cseq", "%d", i_cseq );
    httpd_MsgAdd( answer, "Cache-Control", "%s", "no-cache" );

    if( psz_session )
    {
        httpd_MsgAdd( answer, "Session", "%s;timeout=5", psz_session );
    }
    return VLC_SUCCESS;
}

static int RtspCallbackId( httpd_callback_sys_t *p_args,
                          httpd_client_t *cl,
                          httpd_message_t *answer, httpd_message_t *query )
{
    sout_stream_id_t *id = (sout_stream_id_t*)p_args;
    sout_stream_t    *p_stream = id->p_stream;
    sout_stream_sys_t *p_sys = p_stream->p_sys;
    char *psz_session = NULL;
    char *psz_cseq = NULL;
    int  i_cseq = 0;


    if( answer == NULL || query == NULL )
    {
        return VLC_SUCCESS;
    }
    //fprintf( stderr, "RtspCallback query: type=%d\n", query->i_type );

    answer->i_proto = HTTPD_PROTO_RTSP;
    answer->i_version= query->i_version;
    answer->i_type   = HTTPD_MSG_ANSWER;

    switch( query->i_type )
    {
        case HTTPD_MSG_SETUP:
        {
            char *psz_transport = httpd_MsgGet( query, "Transport" );

            //fprintf( stderr, "HTTPD_MSG_SETUP: transport=%s\n", psz_transport );

            if( strstr( psz_transport, "multicast" ) && id->psz_destination )
            {
                //fprintf( stderr, "HTTPD_MSG_SETUP: multicast\n" );
                answer->i_status = 200;
                answer->psz_status = strdup( "OK" );
                answer->i_body = 0;
                answer->p_body = NULL;
                psz_session = httpd_MsgGet( query, "Session" );
                if( !psz_session )
                {
                    psz_session = malloc( 100 );
                    sprintf( psz_session, "%d", rand() );
                }
                httpd_MsgAdd( answer, "Transport",
                              "RTP/AVP/UDP;destination=%s;port=%d-%d;ttl=%d",
                              id->psz_destination, id->i_port,id->i_port+1,
                              p_sys->i_ttl );
            }
            else if( strstr( psz_transport, "unicast" ) && strstr( psz_transport, "client_port=" ) )
            {
                int  i_port = atoi( strstr( psz_transport, "client_port=" ) + strlen("client_port=") );
                char ip[NI_MAXNUMERICHOST], psz_access[17], psz_url[NI_MAXNUMERICHOST + 8];

                sout_access_out_t *p_access;

                rtsp_client_t *rtsp = NULL;

                if( httpd_ClientIP( cl, ip ) == NULL )
                {
                    answer->i_status = 500;
                    answer->psz_status = strdup( "Internal server error" );
                    answer->i_body = 0;
                    answer->p_body = NULL;
                    break;
                }

                //fprintf( stderr, "HTTPD_MSG_SETUP: unicast ip=%s port=%d\n", ip, i_port );

                psz_session = httpd_MsgGet( query, "Session" );
                if( !psz_session )
                {
                    psz_session = malloc( 100 );
                    sprintf( psz_session, "%d", rand() );

                    rtsp = RtspClientNew( p_stream, psz_session );
                }
                else
                {
                    rtsp = RtspClientGet( p_stream, psz_session );
                    if( rtsp == NULL )
                    {
                        answer->i_status = 454;
                        answer->psz_status = strdup( "Unknown session id" );
                        answer->i_body = 0;
                        answer->p_body = NULL;
                        break;
                    }
                }

                /* first try to create the access out */
                if( p_sys->i_ttl )
                    snprintf( psz_access, sizeof( psz_access ),
                              "udp{raw,ttl=%d}", p_sys->i_ttl );
                else
                    strlcpy( psz_access, "udp{raw}", sizeof( psz_access ) );

                snprintf( psz_url, sizeof( psz_url ),
                         ( strchr( ip, ':' ) != NULL ) ? "[%s]:%d" : "%s:%d",
                         ip, i_port );

                if( ( p_access = sout_AccessOutNew( p_stream->p_sout, psz_access, psz_url ) ) == NULL )
                {
                    msg_Err(