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stream_output.h：源码内容
							/*****************************************************************************
 * stream_output.h : stream output module
 *****************************************************************************
 * Copyright (C) 2002 VideoLAN
 * $Id: stream_output.h 9201 2004-11-06 16:51:46Z yoann $
 *
 * Authors: Christophe Massiot <massiot@via.ecp.fr>
 *          Laurent Aimar <fenrir@via.ecp.fr>
 *          Eric Petit <titer@videolan.org>
 *
 * 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.
 *****************************************************************************/
/*****************************************************************************
 * sout_instance_t: stream output thread descriptor
 *****************************************************************************/
#include "vlc_es.h"
/****************************************************************************
 * sout_instance_t: p_sout
 ****************************************************************************/
struct sout_instance_t
{
    VLC_COMMON_MEMBERS
    char *psz_sout;
    char *psz_chain;
    /* meta data (Read only) XXX it won't be set before the first packet received */
    vlc_meta_t          *p_meta;
    int                 i_out_pace_nocontrol;   /* count of output that can't control the space */
    vlc_mutex_t         lock;
    sout_stream_t       *p_stream;
    /* sout private */
    sout_instance_sys_t *p_sys;
};
/****************************************************************************
 * sout_cfg_t:
 ****************************************************************************/
struct sout_cfg_t
{
    sout_cfg_t  *p_next;
    char        *psz_name;
    char        *psz_value;
};
#define sout_CfgParse( a, b, c, d ) __sout_CfgParse( VLC_OBJECT(a), b, c, d )
VLC_EXPORT( void,   __sout_CfgParse, ( vlc_object_t *, char *psz_prefix, const char **ppsz_options, sout_cfg_t * ) );
VLC_EXPORT( char *, sout_CfgCreate, ( char **, sout_cfg_t **, char * ) );
/****************************************************************************
 * sout_stream_id_t: opaque (private for all sout_stream_t)
 ****************************************************************************/
typedef struct sout_stream_id_t  sout_stream_id_t;
/****************************************************************************
 * sout_packetizer_input_t: p_sout <-> p_packetizer
 ****************************************************************************/
struct sout_packetizer_input_t
{
    sout_instance_t     *p_sout;
    es_format_t         *p_fmt;
    sout_stream_id_t    *id;
};
#define sout_NewInstance(a,b) __sout_NewInstance(VLC_OBJECT(a),b)
VLC_EXPORT( sout_instance_t *,  __sout_NewInstance,  ( vlc_object_t *, char * ) );
VLC_EXPORT( void,               sout_DeleteInstance, ( sout_instance_t * ) );
VLC_EXPORT( sout_packetizer_input_t *, sout_InputNew,( sout_instance_t *, es_format_t * ) );
VLC_EXPORT( int,                sout_InputDelete,      ( sout_packetizer_input_t * ) );
VLC_EXPORT( int,                sout_InputSendBuffer,  ( sout_packetizer_input_t *, block_t* ) );
/****************************************************************************
 * sout_access_out_t:
 ****************************************************************************/
struct sout_access_out_t
{
    VLC_COMMON_MEMBERS
    module_t                *p_module;
    sout_instance_t         *p_sout;
    char                    *psz_access;
    sout_cfg_t              *p_cfg;
    char                    *psz_name;
    sout_access_out_sys_t   *p_sys;
    int                     (*pf_seek)( sout_access_out_t *, off_t );
    int                     (*pf_read)( sout_access_out_t *, block_t * );
    int                     (*pf_write)( sout_access_out_t *, block_t * );
};
VLC_EXPORT( sout_access_out_t *,sout_AccessOutNew, ( sout_instance_t *, char *psz_access, char *psz_name ) );
VLC_EXPORT( void,               sout_AccessOutDelete, ( sout_access_out_t * ) );
VLC_EXPORT( int,                sout_AccessOutSeek,   ( sout_access_out_t *, off_t ) );
VLC_EXPORT( int,                sout_AccessOutRead,   ( sout_access_out_t *, block_t * ) );
VLC_EXPORT( int,                sout_AccessOutWrite,  ( sout_access_out_t *, block_t * ) );
/****************************************************************************
 * mux:
 ****************************************************************************/
struct  sout_mux_t
{
    VLC_COMMON_MEMBERS
    module_t            *p_module;
    sout_instance_t     *p_sout;
    char                *psz_mux;
    sout_cfg_t          *p_cfg;
    sout_access_out_t   *p_access;
    int                 (*pf_addstream)( sout_mux_t *, sout_input_t * );
    int                 (*pf_delstream)( sout_mux_t *, sout_input_t * );
    int                 (*pf_mux)      ( sout_mux_t * );
    int                 (*pf_control)  ( sout_mux_t *, int, va_list );
    /* here are all inputs accepted by muxer */
    int                 i_nb_inputs;
    sout_input_t        **pp_inputs;
    /* mux private */
    sout_mux_sys_t      *p_sys;
    /* XXX private to stream_output.c */
    /* if muxer doesn't support adding stream at any time then we first wait
     *  for stream then we refuse all stream and start muxing */
    vlc_bool_t  b_add_stream_any_time;
    vlc_bool_t  b_waiting_stream;
    /* we wait one second after first stream added */
    mtime_t     i_add_stream_start;
};
enum sout_mux_query_e
{
    /* capabilities */
    MUX_CAN_ADD_STREAM_WHILE_MUXING,    /* arg1= vlc_bool_t *,      res=cannot fail */
    /* properties */
    MUX_GET_ADD_STREAM_WAIT,            /* arg1= vlc_bool_t *,      res=cannot fail */
    MUX_GET_MIME,                       /* arg1= char **            res=can fail    */
};
struct sout_input_t
{
    sout_instance_t *p_sout;
    es_format_t     *p_fmt;
    block_fifo_t    *p_fifo;
    void            *p_sys;
};
VLC_EXPORT( sout_mux_t *,   sout_MuxNew,          ( sout_instance_t*, char *, sout_access_out_t * ) );
VLC_EXPORT( sout_input_t *, sout_MuxAddStream,    ( sout_mux_t *, es_format_t * ) );
VLC_EXPORT( void,           sout_MuxDeleteStream, ( sout_mux_t *, sout_input_t * ) );
VLC_EXPORT( void,           sout_MuxDelete,       ( sout_mux_t * ) );
VLC_EXPORT( void,           sout_MuxSendBuffer, ( sout_mux_t *, sout_input_t  *, block_t * ) );
static inline int sout_MuxControl( sout_mux_t *p_mux, int i_query, ... )
{
    va_list args;
    int     i_result;
    va_start( args, i_query );
    i_result = p_mux->pf_control( p_mux, i_query, args );
    va_end( args );
    return i_result;
}
/****************************************************************************
 * sout_stream:
 ****************************************************************************/
struct sout_stream_t
{
    VLC_COMMON_MEMBERS
    module_t          *p_module;
    sout_instance_t   *p_sout;
    char              *psz_name;
    sout_cfg_t        *p_cfg;
    char              *psz_next;
    /* add, remove a stream */
    sout_stream_id_t *(*pf_add)( sout_stream_t *, es_format_t * );
    int               (*pf_del)( sout_stream_t *, sout_stream_id_t * );
    /* manage a packet */
    int               (*pf_send)( sout_stream_t *, sout_stream_id_t *, block_t* );
    /* private */
    sout_stream_sys_t *p_sys;
};
VLC_EXPORT( sout_stream_t *, sout_StreamNew, ( sout_instance_t *, char *psz_chain ) );
VLC_EXPORT( void,            sout_StreamDelete, ( sout_stream_t * ) );
static inline sout_stream_id_t *sout_StreamIdAdd( sout_stream_t *s, es_format_t *fmt )
{
    return s->pf_add( s, fmt );
}
static inline int sout_StreamIdDel( sout_stream_t *s, sout_stream_id_t *id )
{
    return s->pf_del( s, id );
}
static inline int sout_StreamIdSend( sout_stream_t *s, sout_stream_id_t *id, block_t *b )
{
    return s->pf_send( s, id, b );
}
/****************************************************************************
 * Announce handler mess
 ****************************************************************************/
struct sap_session_t;
struct session_descriptor_t
{
    char *psz_name;
    char *psz_uri;
    int i_port;
    int i_ttl;
    int i_payload;   /* SAP Payload type */
    char *psz_group;
    sap_session_t *p_sap; /* If we have a sap session, remember it */
    char *psz_sdp;
};
#define METHOD_TYPE_SAP 1
#define METHOD_TYPE_SLP 2
struct announce_method_t
{
    int i_type;
    /* For SAP */
    int i_ip_version;
    char *psz_ipv6_scope;
    char *psz_address; /* If we use a custom address */
};
/* SAP Specific structures */
/* 100ms */
#define SAP_IDLE ((mtime_t)(0.100*CLOCK_FREQ))
#define SAP_MAX_BUFFER 65534
#define MIN_INTERVAL 2
#define MAX_INTERVAL 300
/* A SAP announce address. For each of these, we run the
 * control flow algorithm */
struct sap_address_t
{
    char *psz_address;
    int i_ip_version;
    int i_port;
    int i_rfd; /* Read socket */
    int i_wfd; /* Write socket */
    /* Used for flow control */
    mtime_t t1;
    vlc_bool_t b_enabled;
    vlc_bool_t b_ready;
    int i_interval;
    int i_buff;
    int i_limit;
};
/* A SAP session descriptor, enqueued in the SAP handler queue */
struct sap_session_t
{
    char          *psz_sdp;
    char          *psz_data;
    int            i_length;
    sap_address_t *p_address;
    /* Last and next send */
    mtime_t        i_last;
    mtime_t        i_next;
};
/* The SAP handler, running in a separate thread */
struct sap_handler_t
{
    VLC_COMMON_MEMBERS /* needed to create a thread */
    sap_session_t **pp_sessions;
    sap_address_t **pp_addresses;
    vlc_bool_t b_control;
    int i_sessions;
    int i_addresses;
    int i_current_session;
    int (*pf_add)  ( sap_handler_t*, session_descriptor_t *,announce_method_t*);
    int (*pf_del)  ( sap_handler_t*, session_descriptor_t *);
};
/* The main announce handler object */
struct announce_handler_t
{
    VLC_COMMON_MEMBERS
    sap_handler_t *p_sap;
};
/* End */
static inline sout_cfg_t *sout_cfg_find( sout_cfg_t *p_cfg, char *psz_name )
{
    while( p_cfg && strcmp( p_cfg->psz_name, psz_name ) )
    {
        p_cfg = p_cfg->p_next;
    }
    return p_cfg;
}
static inline char *sout_cfg_find_value( sout_cfg_t *p_cfg, char *psz_name )
{
    while( p_cfg && strcmp( p_cfg->psz_name, psz_name ) )
    {
        p_cfg = p_cfg->p_next;
    }
    if( p_cfg && p_cfg->psz_value )
    {
        return( p_cfg->psz_value );
    }
    return NULL;
}
/* Announce system */
VLC_EXPORT( int,                sout_AnnounceRegister, (sout_instance_t *,session_descriptor_t*, announce_method_t* ) );
VLC_EXPORT(session_descriptor_t*,sout_AnnounceRegisterSDP, (sout_instance_t *,char *, announce_method_t* ) );
VLC_EXPORT( int,                sout_AnnounceUnRegister, (sout_instance_t *,session_descriptor_t* ) );
VLC_EXPORT(session_descriptor_t*,sout_AnnounceSessionCreate, () );
VLC_EXPORT(void,                 sout_AnnounceSessionDestroy, (session_descriptor_t *) );
VLC_EXPORT(announce_method_t*,   sout_AnnounceMethodCreate, (int) );
#define announce_HandlerCreate(a) __announce_HandlerCreate(VLC_OBJECT(a))
announce_handler_t*  __announce_HandlerCreate( vlc_object_t *);
/* Private functions for the announce handler */
int announce_HandlerDestroy( announce_handler_t * );
int announce_Register( announce_handler_t *p_announce,
                session_descriptor_t *p_session,
                announce_method_t *p_method );
int announce_UnRegister( announce_handler_t *p_announce,
                session_descriptor_t *p_session );
sap_handler_t *announce_SAPHandlerCreate( announce_handler_t *p_announce );
void announce_SAPHandlerDestroy( sap_handler_t *p_sap );

						