modules/stream_out/gather.c

   1 /*****************************************************************************
   2  * gather.c: gathering stream output module
   3  *****************************************************************************
   4  * Copyright (C) 2003-2004 VLC authors and VideoLAN
   5  * $Id$
   6  *
   7  * Authors: Laurent Aimar <fenrir@via.ecp.fr>
   8  *
   9  * This program is free software; you can redistribute it and/or modify it
  10  * under the terms of the GNU Lesser General Public License as published by
  11  * the Free Software Foundation; either version 2.1 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  17  * GNU Lesser General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU Lesser General Public License
  20  * along with this program; if not, write to the Free Software Foundation,
  21  * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  22  *****************************************************************************/
  23
  24 /*****************************************************************************
  25  * Preamble
  26  *****************************************************************************/
  27
  28 #ifdef HAVE_CONFIG_H
  29 # include "config.h"
  30 #endif
  31
  32 #include <vlc_common.h>
  33 #include <vlc_plugin.h>
  34 #include <vlc_input.h>
  35 #include <vlc_sout.h>
  36 #include <vlc_block.h>
  37
  38 /*****************************************************************************
  39  * Module descriptor
  40  *****************************************************************************/
  41 static int      Open    ( vlc_object_t * );
  42 static void     Close   ( vlc_object_t * );
  43
  44 vlc_module_begin ()
  45     set_description( N_("Gathering stream output") )
  46     set_capability( "sout stream", 50 )
  47     add_shortcut( "gather" )
  48     set_callbacks( Open, Close )
  49 vlc_module_end ()
  50
  51 /*****************************************************************************
  52  * Exported prototypes
  53  *****************************************************************************/
  54 static sout_stream_id_sys_t *Add ( sout_stream_t *, const es_format_t * );
  55 static void              Del ( sout_stream_t *, sout_stream_id_sys_t * );
  56 static int               Send( sout_stream_t *, sout_stream_id_sys_t *, block_t* );
  57
  58 struct sout_stream_id_sys_t
  59 {
  60     bool    b_used;
  61     bool    b_streamswap;
  62
  63     es_format_t fmt;
  64     void          *id;
  65 };
  66
  67 struct sout_stream_sys_t
  68 {
  69     int              i_id;
  70     sout_stream_id_sys_t **id;
  71 };
  72
  73 /*****************************************************************************
  74  * Open:
  75  *****************************************************************************/
  76 static int Open( vlc_object_t *p_this )
  77 {
  78     sout_stream_t     *p_stream = (sout_stream_t*)p_this;
  79     sout_stream_sys_t *p_sys;
  80
  81     p_stream->p_sys = p_sys = malloc( sizeof( sout_stream_sys_t ) );
  82     if( p_sys == NULL )
  83         return VLC_EGENERIC;
  84
  85     if( !p_stream->p_next )
  86     {
  87         free( p_sys );
  88         return VLC_EGENERIC;
  89     }
  90     p_stream->pf_add    = Add;
  91     p_stream->pf_del    = Del;
  92     p_stream->pf_send   = Send;
  93
  94     TAB_INIT( p_sys->i_id, p_sys->id );
  95
  96     return VLC_SUCCESS;
  97 }
  98
  99 /*****************************************************************************
 100  * Close:
 101  *****************************************************************************/
 102 static void Close( vlc_object_t * p_this )
 103 {
 104     sout_stream_t     *p_stream = (sout_stream_t*)p_this;
 105     sout_stream_sys_t *p_sys = p_stream->p_sys;
 106     int i;
 107
 108     for( i = 0; i < p_sys->i_id; i++ )
 109     {
 110         sout_stream_id_sys_t *id = p_sys->id[i];
 111
 112         sout_StreamIdDel( p_stream->p_next, id->id );
 113         es_format_Clean( &id->fmt );
 114         free( id );
 115     }
 116     TAB_CLEAN( p_sys->i_id, p_sys->id );
 117
 118     free( p_sys );
 119 }
 120
 121 /*****************************************************************************
 122  * Add:
 123  *****************************************************************************/
 124 static sout_stream_id_sys_t * Add( sout_stream_t *p_stream, const es_format_t *p_fmt )
 125 {
 126     sout_stream_sys_t *p_sys = p_stream->p_sys;
 127     sout_stream_id_sys_t  *id;
 128     int i;
 129
 130     /* search a compatible output */
 131     for( i = 0; i < p_sys->i_id; i++ )
 132     {
 133         id = p_sys->id[i];
 134         if( id->b_used )
 135             continue;
 136
 137         if( id->fmt.i_cat != p_fmt->i_cat || id->fmt.i_codec != p_fmt->i_codec )
 138             continue;
 139
 140         if( id->fmt.i_cat == AUDIO_ES )
 141         {
 142             audio_format_t *p_a = &id->fmt.audio;
 143             if( p_a->i_rate != p_fmt->audio.i_rate ||
 144                 p_a->i_channels != p_fmt->audio.i_channels ||
 145                 p_a->i_blockalign != p_fmt->audio.i_blockalign )
 146                 continue;
 147         }
 148         else if( id->fmt.i_cat == VIDEO_ES )
 149         {
 150             video_format_t *p_v = &id->fmt.video;
 151             if( p_v->i_width != p_fmt->video.i_width ||
 152                 p_v->i_height != p_fmt->video.i_height )
 153                 continue;
 154         }
 155
 156         /* */
 157         msg_Dbg( p_stream, "reusing already opened output" );
 158         id->b_used = true;
 159         id->b_streamswap = true;
 160         return id;
 161     }
 162
 163     /* destroy all outputs from the same category */
 164     for( i = 0; i < p_sys->i_id; i++ )
 165     {
 166         id = p_sys->id[i];
 167         if( !id->b_used && id->fmt.i_cat == p_fmt->i_cat )
 168         {
 169             TAB_REMOVE( p_sys->i_id, p_sys->id, id );
 170             sout_StreamIdDel( p_stream->p_next, id->id );
 171             es_format_Clean( &id->fmt );
 172             free( id );
 173
 174             i = 0;
 175             continue;
 176         }
 177     }
 178
 179     msg_Dbg( p_stream, "creating new output" );
 180     id = malloc( sizeof( sout_stream_id_sys_t ) );
 181     if( id == NULL )
 182         return NULL;
 183     es_format_Copy( &id->fmt, p_fmt );
 184     id->b_streamswap     = false;
 185     id->b_used           = true;
 186     id->id               = sout_StreamIdAdd( p_stream->p_next, &id->fmt );
 187     if( id->id == NULL )
 188     {
 189         free( id );
 190         return NULL;
 191     }
 192     TAB_APPEND( p_sys->i_id, p_sys->id, id );
 193
 194     return id;
 195 }
 196
 197 /*****************************************************************************
 198  * Del:
 199  *****************************************************************************/
 200 static void Del( sout_stream_t *p_stream, sout_stream_id_sys_t *id )
 201 {
 202     VLC_UNUSED(p_stream);
 203     id->b_used = false;
 204 }
 205
 206 /*****************************************************************************
 207  * Send:
 208  *****************************************************************************/
 209 static int Send( sout_stream_t *p_stream,
 210                  sout_stream_id_sys_t *id, block_t *p_buffer )
 211 {
 212     if ( id->b_streamswap )
 213     {
 214         id->b_streamswap = false;
 215         p_buffer->i_flags |= BLOCK_FLAG_DISCONTINUITY;
 216     }
 217     return sout_StreamIdSend( p_stream->p_next, id->id, p_buffer );
 218 }