modules/stream_out/display.c

   1 /*****************************************************************************
   2  * display.c: display stream output module
   3  *****************************************************************************
   4  * Copyright (C) 2001, 2002 the VideoLAN team
   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
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 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 General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, 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 #define AUDIO_TEXT N_("Enable audio")
  42 #define AUDIO_LONGTEXT N_( "Enable/disable audio rendering." )
  43 #define VIDEO_TEXT N_("Enable video")
  44 #define VIDEO_LONGTEXT N_( "Enable/disable video rendering." )
  45 #define DELAY_TEXT N_("Delay")
  46 #define DELAY_LONGTEXT N_( "Introduces a delay in the display of the stream." )
  47
  48 static int  Open ( vlc_object_t * );
  49 static void Close( vlc_object_t * );
  50
  51 #define SOUT_CFG_PREFIX "sout-display-"
  52
  53 vlc_module_begin ()
  54     set_shortname( N_("Display"))
  55     set_description( N_("Display stream output") )
  56     set_capability( "sout stream", 50 )
  57     add_shortcut( "display" )
  58     set_category( CAT_SOUT )
  59     set_subcategory( SUBCAT_SOUT_STREAM )
  60     add_bool( SOUT_CFG_PREFIX "audio", true, NULL, AUDIO_TEXT,
  61               AUDIO_LONGTEXT, true )
  62     add_bool( SOUT_CFG_PREFIX "video", true, NULL, VIDEO_TEXT,
  63               VIDEO_LONGTEXT, true )
  64     add_integer( SOUT_CFG_PREFIX "delay", 100, NULL, DELAY_TEXT,
  65                  DELAY_LONGTEXT, true )
  66     set_callbacks( Open, Close )
  67 vlc_module_end ()
  68
  69
  70 /*****************************************************************************
  71  * Exported prototypes
  72  *****************************************************************************/
  73 static const char *const ppsz_sout_options[] = {
  74     "audio", "video", "delay", NULL
  75 };
  76
  77 static sout_stream_id_t *Add ( sout_stream_t *, es_format_t * );
  78 static int               Del ( sout_stream_t *, sout_stream_id_t * );
  79 static int               Send( sout_stream_t *, sout_stream_id_t *, block_t* );
  80
  81 struct sout_stream_sys_t
  82 {
  83     input_thread_t *p_input;
  84     unsigned        i_es;
  85
  86     bool     b_audio;
  87     bool     b_video;
  88
  89     mtime_t        i_delay;
  90 };
  91
  92 /*****************************************************************************
  93  * Open:
  94  *****************************************************************************/
  95 static int Open( vlc_object_t *p_this )
  96 {
  97     sout_stream_t     *p_stream = (sout_stream_t*)p_this;
  98     sout_stream_sys_t *p_sys;
  99
 100     p_sys = malloc( sizeof( sout_stream_sys_t ) );
 101     if( p_sys == NULL )
 102         return VLC_ENOMEM;
 103
 104     config_ChainParse( p_stream, SOUT_CFG_PREFIX, ppsz_sout_options,
 105                    p_stream->p_cfg );
 106
 107     p_sys->p_input = NULL;
 108     p_sys->i_es    = 0;
 109     p_sys->b_audio = var_GetBool( p_stream, SOUT_CFG_PREFIX"audio" );
 110     p_sys->b_video = var_GetBool( p_stream, SOUT_CFG_PREFIX "video" );
 111     p_sys->i_delay = var_GetInteger( p_stream, SOUT_CFG_PREFIX "delay" );
 112     p_sys->i_delay *= 1000;
 113
 114     p_stream->pf_add    = Add;
 115     p_stream->pf_del    = Del;
 116     p_stream->pf_send   = Send;
 117     p_stream->p_sys     = p_sys;
 118
 119     /* update p_sout->i_out_pace_nocontrol */
 120     p_stream->p_sout->i_out_pace_nocontrol++;
 121
 122     return VLC_SUCCESS;
 123 }
 124
 125 /*****************************************************************************
 126  * Close:
 127  *****************************************************************************/
 128 static void Close( vlc_object_t * p_this )
 129 {
 130     sout_stream_t     *p_stream = (sout_stream_t*)p_this;
 131     sout_stream_sys_t *p_sys = p_stream->p_sys;
 132
 133     /* update p_sout->i_out_pace_nocontrol */
 134     p_stream->p_sout->i_out_pace_nocontrol--;
 135
 136     free( p_sys );
 137 }
 138
 139 struct sout_stream_id_t
 140 {
 141     decoder_t *p_dec;
 142 };
 143
 144 static sout_stream_id_t * Add( sout_stream_t *p_stream, es_format_t *p_fmt )
 145 {
 146     sout_stream_sys_t *p_sys = p_stream->p_sys;
 147     sout_stream_id_t *id;
 148
 149     if( ( p_fmt->i_cat == AUDIO_ES && !p_sys->b_audio )||
 150         ( p_fmt->i_cat == VIDEO_ES && !p_sys->b_video ) )
 151     {
 152         return NULL;
 153     }
 154
 155     id = malloc( sizeof( sout_stream_id_t ) );
 156     if( id == NULL )
 157         return NULL;
 158
 159     if( p_sys->i_es == 0 )
 160     {
 161         p_sys->p_input = vlc_object_find( p_stream, VLC_OBJECT_INPUT,
 162                                           FIND_PARENT );
 163         if( p_sys->p_input == NULL )
 164         {
 165             msg_Err( p_stream, "cannot find input" );
 166             free( id );
 167             return NULL;
 168         }
 169     }
 170
 171     id->p_dec = input_DecoderNew( p_sys->p_input, p_fmt, NULL, NULL );
 172     if( id->p_dec == NULL )
 173     {
 174         msg_Err( p_stream, "cannot create decoder for fcc=`%4.4s'",
 175                  (char*)&p_fmt->i_codec );
 176         free( id );
 177         if( p_sys->i_es == 0 )
 178             vlc_object_release( p_sys->p_input );
 179         return NULL;
 180     }
 181
 182     p_sys->i_es++;
 183     return id;
 184 }
 185
 186 static int Del( sout_stream_t *p_stream, sout_stream_id_t *id )
 187 {
 188     input_DecoderDelete( id->p_dec );
 189     if( --p_stream->p_sys->i_es == 0)
 190         vlc_object_release( p_stream->p_sys->p_input );
 191
 192     free( id );
 193     return VLC_SUCCESS;
 194 }
 195
 196 static int Send( sout_stream_t *p_stream, sout_stream_id_t *id,
 197                  block_t *p_buffer )
 198 {
 199     sout_stream_sys_t *p_sys = p_stream->p_sys;
 200
 201     while( p_buffer )
 202     {
 203         block_t *p_next = p_buffer->p_next;
 204
 205         p_buffer->p_next = NULL;
 206
 207         if( id->p_dec && p_buffer->i_buffer > 0 )
 208         {
 209             if( p_buffer->i_dts <= VLC_TS_INVALID )
 210                 p_buffer->i_dts = 0;
 211             else
 212                 p_buffer->i_dts += p_sys->i_delay;
 213
 214             if( p_buffer->i_pts <= VLC_TS_INVALID )
 215                 p_buffer->i_pts = 0;
 216             else
 217                 p_buffer->i_pts += p_sys->i_delay;
 218
 219             input_DecoderDecode( id->p_dec, p_buffer, false );
 220         }
 221
 222         p_buffer = p_next;
 223     }
 224
 225     return VLC_SUCCESS;
 226 }