rtsp.c

video linux conference

/*****************************************************************************
 * rtsp.c: rtsp VoD server module
 *****************************************************************************
 * Copyright (C) 2003-2004 VideoLAN
 * $Id: rtsp.c 11380 2005-06-10 14:20:40Z fkuehne $
 *
 * Authors: Laurent Aimar <[e-mail]>
 *          Gildas Bazin <[e-mail]>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
 *****************************************************************************/

/*****************************************************************************
 * Preamble
 *****************************************************************************/
#include <stdlib.h>

#include <errno.h>

#include <vlc/vlc.h>
#include <vlc/input.h>
#include <vlc/sout.h>

#include "vlc_httpd.h"
#include "vlc_vod.h"
#include "network.h"

/*****************************************************************************
 * Module descriptor
 *****************************************************************************/
static int  Open ( vlc_object_t * );
static void Close( vlc_object_t * );

#define HOST_TEXT N_( "Host address" )
#define HOST_LONGTEXT N_( \
    "You can set the address, port and path the rtsp interface will bind to." \
    "\n Syntax is address:port/path. Default is to bind to localhost address "\
    "on port 554, with no path. Use 0.0.0.0 to bind to all addresses." )
vlc_module_begin();
    set_shortname( _("RTSP VoD" ) );
    set_description( _("RTSP VoD server") );
    set_category( CAT_SOUT );
    set_subcategory( SUBCAT_SOUT_VOD );
    set_capability( "vod server", 1 );
    set_callbacks( Open, Close );
    add_shortcut( "rtsp" );
    add_string ( "rtsp-host", NULL, NULL, HOST_TEXT, HOST_LONGTEXT, VLC_TRUE );
vlc_module_end();

/*****************************************************************************
 * Exported prototypes
 *****************************************************************************/

typedef struct media_es_t media_es_t;

typedef struct
{
    media_es_t *p_media_es;
    char *psz_ip;
    int i_port;

} rtsp_client_es_t;

typedef struct
{
    char *psz_session;
    int64_t i_last; /* for timeout */

    vlc_bool_t b_playing; /* is it in "play" state */
    vlc_bool_t b_paused; /* is it in "pause" state */

    int i_es;
    rtsp_client_es_t **es;

} rtsp_client_t;

struct media_es_t
{
    /* VoD server */
    vod_t *p_vod;

    /* RTSP server */
    httpd_url_t *p_rtsp_url;

    vod_media_t *p_media;

    es_format_t fmt;
    int         i_port;
    uint8_t     i_payload_type;
    char        *psz_rtpmap;
    char        *psz_fmtp;

};

struct vod_media_t
{
    /* VoD server */
    vod_t *p_vod;

    /* RTSP server */
    httpd_url_t  *p_rtsp_url;
    char         *psz_rtsp_control;
    char         *psz_rtsp_path;

    char *psz_destination;
    int  i_port;
    int  i_port_audio;
    int  i_port_video;
    int  i_ttl;
    int  i_payload_type;

    int64_t i_sdp_id;
    int     i_sdp_version;

    vlc_bool_t b_multicast;

    vlc_mutex_t lock;

    /* ES list */
    int        i_es;
    media_es_t **es;
    char       *psz_mux;

    /* RTSP client */
    int           i_rtsp;
    rtsp_client_t **rtsp;

    /* Infos */
    char *psz_session_name;
    char *psz_session_description;
    char *psz_session_url;
    char *psz_session_email;
    mtime_t i_length;
};

struct vod_sys_t
{
    /* RTSP server */
    httpd_host_t *p_rtsp_host;
    char *psz_host;
    char *psz_path;
    int i_port;

    /* List of media */
    int i_media;
    vod_media_t **media;
};

static vod_media_t *MediaNew( vod_t *, char *, input_item_t * );
static void         MediaDel( vod_t *, vod_media_t * );
static int          MediaAddES( vod_t *, vod_media_t *, es_format_t * );
static void         MediaDelES( vod_t *, vod_media_t *, es_format_t * );

static rtsp_client_t *RtspClientNew( vod_media_t *, char * );
static rtsp_client_t *RtspClientGet( vod_media_t *, char * );
static void           RtspClientDel( vod_media_t *, rtsp_client_t * );

static int RtspCallback( httpd_callback_sys_t *, httpd_client_t *,
                         httpd_message_t *, httpd_message_t * );
static int RtspCallbackES( httpd_callback_sys_t *, httpd_client_t *,
                           httpd_message_t *, httpd_message_t * );

static char *SDPGenerate( vod_media_t *, char * );

static void sprintf_hexa( char *s, uint8_t *p_data, int i_data )
{
    static const char hex[16] = "0123456789abcdef";
    int i;

    for( i = 0; i < i_data; i++ )
    {
        s[2*i+0] = hex[(p_data[i]>>4)&0xf];
        s[2*i+1] = hex[(p_data[i]   )&0xf];
    }
    s[2*i_data] = '\0';
}

/*****************************************************************************
 * Open: Starts the RTSP server module
 *****************************************************************************/
static int Open( vlc_object_t *p_this )
{
    vod_t *p_vod = (vod_t *)p_this;
    vod_sys_t *p_sys = 0;
    char *psz_url = 0;
    vlc_url_t url;

    psz_url = config_GetPsz( p_vod, "rtsp-host" );
    vlc_UrlParse( &url, psz_url, 0 );
    if( psz_url ) free( psz_url );

    if( !url.psz_host || !*url.psz_host )
    {
        if( url.psz_host ) free( url.psz_host );
        url.psz_host = strdup( "localhost" );
    }
    if( url.i_port <= 0 ) url.i_port = 554;

    p_vod->p_sys = p_sys = malloc( sizeof( vod_sys_t ) );
    if( !p_sys ) goto error;
    p_sys->p_rtsp_host = 0;

    p_sys->p_rtsp_host =
        httpd_HostNew( VLC_OBJECT(p_vod), url.psz_host, url.i_port );
    if( !p_sys->p_rtsp_host )
    {
        msg_Err( p_vod, "cannot create http server (%s:%i)",
                 url.psz_host, url.i_port );
        goto error;
    }

    p_sys->psz_host = strdup( url.psz_host );
    p_sys->psz_path = strdup( url.psz_path ? url.psz_path : "/" );
    p_sys->i_port = url.i_port;

    vlc_UrlClean( &url );
    p_sys->media = 0;
    p_sys->i_media = 0;

    p_vod->pf_media_new = MediaNew;
    p_vod->pf_media_del = MediaDel;
    p_vod->pf_media_add_es = MediaAddES;
    p_vod->pf_media_del_es = MediaDelES;

    return VLC_SUCCESS;

 error:

    if( p_sys && p_sys->p_rtsp_host ) httpd_HostDelete( p_sys->p_rtsp_host );
    if( p_sys ) free( p_sys );
    vlc_UrlClean( &url );
    return VLC_EGENERIC;
}

/*****************************************************************************
 * Close:
 *****************************************************************************/
static void Close( vlc_object_t * p_this )
{
    vod_t *p_vod = (vod_t *)p_this;
    vod_sys_t *p_sys = p_vod->p_sys;

    httpd_HostDelete( p_sys->p_rtsp_host );

    /* TODO delete medias */

    free( p_sys );
}

/*****************************************************************************
 * Media handling
 *****************************************************************************/
static vod_media_t *MediaNew( vod_t *p_vod, char *psz_name,
                              input_item_t *p_item )
{
    vod_sys_t *p_sys = p_vod->p_sys;
    vod_media_t *p_media = malloc( sizeof(vod_media_t) );
    int i;

    memset( p_media, 0, sizeof(vod_media_t) );
    p_media->es = 0;
    p_media->psz_mux = 0;
    p_media->rtsp = 0;

    asprintf( &p_media->psz_rtsp_path, "%s%s", p_sys->psz_path, psz_name );
    p_media->p_rtsp_url =
        httpd_UrlNewUnique( p_sys->p_rtsp_host, p_media->psz_rtsp_path, 0, 0 );

    if( !p_media->p_rtsp_url )
    {
        msg_Err( p_vod, "cannot create http url (%s)", p_media->psz_rtsp_path);
        free( p_media->psz_rtsp_path );
        free( p_media );
        return 0;
    }

    msg_Dbg( p_vod, "created rtsp url: %s", p_media->psz_rtsp_path );

    asprintf( &p_media->psz_rtsp_control, "rtsp://%s:%d%s",
              p_sys->psz_host, p_sys->i_port, p_media->psz_rtsp_path );

    httpd_UrlCatch( p_media->p_rtsp_url, HTTPD_MSG_DESCRIBE,
                    RtspCallback, (void*)p_media );
    httpd_UrlCatch( p_media->p_rtsp_url, HTTPD_MSG_PLAY,
                    RtspCallback, (void*)p_media );
    httpd_UrlCatch( p_media->p_rtsp_url, HTTPD_MSG_PAUSE,
                    RtspCallback, (void*)p_media );
    httpd_UrlCatch( p_media->p_rtsp_url, HTTPD_MSG_TEARDOWN,
                    RtspCallback, (void*)p_media );

    p_media->p_vod = p_vod;

    TAB_APPEND( p_sys->i_media, p_sys->media, p_media );

    vlc_mutex_init( p_vod, &p_media->lock );
    p_media->psz_session_name = strdup("");
    p_media->psz_session_description = strdup("");
    p_media->psz_session_url = strdup("");
    p_media->psz_session_email = strdup("");

    p_media->i_port_audio = 1234;
    p_media->i_port_video = 1236;
    p_media->i_port       = 1238;
    p_media->i_payload_type = 96;

    p_media->i_sdp_id = mdate();
    p_media->i_sdp_version = 1;
    p_media->i_length = p_item->i_duration;

    vlc_mutex_lock( &p_item->lock );
    msg_Dbg( p_vod, "media has %i declared ES", p_item->i_es );
    for( i = 0; i < p_item->i_es; i++ )
    {
        MediaAddES( p_vod, p_media, p_item->es[i] );
    }
    vlc_mutex_unlock( &p_item->lock );

    return p_media;
}

static void MediaDel( vod_t *p_vod, vod_media_t *p_media )
{
    vod_sys_t *p_sys = p_vod->p_sys;

    msg_Dbg( p_vod, "deleting media: %s", p_media->psz_rtsp_path );

    while( p_media->i_rtsp > 0 ) RtspClientDel( p_media, p_media->rtsp[0] );
    httpd_UrlDelete( p_media->p_rtsp_url );
    if( p_media->psz_rtsp_path ) free( p_media->psz_rtsp_path );
    if( p_media->psz_rtsp_control ) free( p_media->psz_rtsp_control );

    TAB_REMOVE( p_sys->i_media, p_sys->media, p_media );

    while( p_media->i_es ) MediaDelES( p_vod, p_media, &p_media->es[0]->fmt );

    vlc_mutex_destroy( &p_media->lock );
    free( p_media );
}