modules/stream_out/display.c

   1 /*****************************************************************************
   2  * display.c: display stream output module
   3  *****************************************************************************
   4  * Copyright (C) 2001-2011 VLC authors and VideoLAN
   5  *
   6  * Authors: Laurent Aimar <fenrir@via.ecp.fr>
   7  *
   8  * This program is free software; you can redistribute it and/or modify it
   9  * under the terms of the GNU Lesser General Public License as published by
  10  * the Free Software Foundation; either version 2.1 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  16  * GNU Lesser General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU Lesser General Public License
  19  * along with this program; if not, write to the Free Software Foundation,
  20  * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  21  *****************************************************************************/
  22
  23 /*****************************************************************************
  24  * Preamble
  25  *****************************************************************************/
  26
  27 #ifdef HAVE_CONFIG_H
  28 # include "config.h"
  29 #endif
  30
  31 #include <vlc_common.h>
  32 #include <vlc_plugin.h>
  33 #include <vlc_input.h>
  34 #include <vlc_sout.h>
  35 #include <vlc_block.h>
  36
  37 /*****************************************************************************
  38  * Module descriptor
  39  *****************************************************************************/
  40 #define AUDIO_TEXT N_("Enable audio")
  41 #define AUDIO_LONGTEXT N_( "Enable/disable audio rendering." )
  42 #define VIDEO_TEXT N_("Enable video")
  43 #define VIDEO_LONGTEXT N_( "Enable/disable video rendering." )
  44 #define DELAY_TEXT N_("Delay (ms)")
  45 #define DELAY_LONGTEXT N_( "Introduces a delay in the display of the stream." )
  46
  47 static int  Open ( vlc_object_t * );
  48 static void Close( vlc_object_t * );
  49
  50 #define SOUT_CFG_PREFIX "sout-display-"
  51
  52 vlc_module_begin ()
  53     set_shortname( N_("Display"))
  54     set_description( N_("Display stream output") )
  55     set_capability( "sout stream", 50 )
  56     add_shortcut( "display" )
  57     set_category( CAT_SOUT )
  58     set_subcategory( SUBCAT_SOUT_STREAM )
  59
  60     add_bool( SOUT_CFG_PREFIX "audio", true, AUDIO_TEXT,
  61               AUDIO_LONGTEXT, true )
  62     add_bool( SOUT_CFG_PREFIX "video", true, VIDEO_TEXT,
  63               VIDEO_LONGTEXT, true )
  64     add_integer( SOUT_CFG_PREFIX "delay", 100, 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_sys_t *Add ( sout_stream_t *, es_format_t * );
  78 static int               Del ( sout_stream_t *, sout_stream_id_sys_t * );
  79 static int               Send( sout_stream_t *, sout_stream_id_sys_t *, block_t* );
  80
  81 struct sout_stream_sys_t
  82 {
  83     bool     b_audio;
  84     bool     b_video;
  85
  86     mtime_t        i_delay;
  87     input_resource_t *p_resource;
  88 };
  89
  90 /*****************************************************************************
  91  * Open:
  92  *****************************************************************************/
  93 static int Open( vlc_object_t *p_this )
  94 {
  95     sout_stream_t     *p_stream = (sout_stream_t*)p_this;
  96     sout_stream_sys_t *p_sys;
  97
  98     p_sys = malloc( sizeof( sout_stream_sys_t ) );
  99     if( p_sys == NULL )
 100         return VLC_ENOMEM;
 101
 102     p_sys->p_resource = input_resource_New( p_this );
 103     if( unlikely(p_sys->p_resource == NULL) )
 104     {
 105         free( p_sys );
 106         return VLC_ENOMEM;
 107     }
 108
 109     config_ChainParse( p_stream, SOUT_CFG_PREFIX, ppsz_sout_options,
 110                    p_stream->p_cfg );
 111
 112     p_sys->b_audio = var_GetBool( p_stream, SOUT_CFG_PREFIX"audio" );
 113     p_sys->b_video = var_GetBool( p_stream, SOUT_CFG_PREFIX "video" );
 114     p_sys->i_delay = var_GetInteger( p_stream, SOUT_CFG_PREFIX "delay" );
 115     p_sys->i_delay = p_sys->i_delay * CLOCK_FREQ / 1000;
 116
 117     p_stream->pf_add    = Add;
 118     p_stream->pf_del    = Del;
 119     p_stream->pf_send   = Send;
 120     p_stream->p_sys     = p_sys;
 121     p_stream->pace_nocontrol = true;
 122
 123     return VLC_SUCCESS;
 124 }
 125
 126 /*****************************************************************************
 127  * Close:
 128  *****************************************************************************/
 129 static void Close( vlc_object_t * p_this )
 130 {
 131     sout_stream_t     *p_stream = (sout_stream_t*)p_this;
 132     sout_stream_sys_t *p_sys = p_stream->p_sys;
 133
 134     input_resource_Terminate( p_sys->p_resource );
 135     input_resource_Release( p_sys->p_resource );
 136     free( p_sys );
 137 }
 138
 139 static sout_stream_id_sys_t * Add( sout_stream_t *p_stream, es_format_t *p_fmt )
 140 {
 141     sout_stream_sys_t *p_sys = p_stream->p_sys;
 142
 143     if( ( p_fmt->i_cat == AUDIO_ES && !p_sys->b_audio )||
 144         ( p_fmt->i_cat == VIDEO_ES && !p_sys->b_video ) )
 145     {
 146         return NULL;
 147     }
 148
 149     decoder_t *p_dec = input_DecoderCreate( VLC_OBJECT(p_stream), p_fmt,
 150                                             p_sys->p_resource );
 151     if( p_dec == NULL )
 152     {
 153         msg_Err( p_stream, "cannot create decoder for fcc=`%4.4s'",
 154                  (char*)&p_fmt->i_codec );
 155         return NULL;
 156     }
 157     return (sout_stream_id_sys_t *)p_dec;
 158 }
 159
 160 static int Del( sout_stream_t *p_stream, sout_stream_id_sys_t *id )
 161 {
 162     (void) p_stream;
 163     input_DecoderDelete( (decoder_t *)id );
 164     return VLC_SUCCESS;
 165 }
 166
 167 static int Send( sout_stream_t *p_stream, sout_stream_id_sys_t *id,
 168                  block_t *p_buffer )
 169 {
 170     sout_stream_sys_t *p_sys = p_stream->p_sys;
 171
 172     while( p_buffer )
 173     {
 174         block_t *p_next = p_buffer->p_next;
 175
 176         p_buffer->p_next = NULL;
 177
 178         if( id != NULL && p_buffer->i_buffer > 0 )
 179         {
 180             if( p_buffer->i_dts <= VLC_TS_INVALID )
 181                 p_buffer->i_dts = 0;
 182             else
 183                 p_buffer->i_dts += p_sys->i_delay;
 184
 185             if( p_buffer->i_pts <= VLC_TS_INVALID )
 186                 p_buffer->i_pts = 0;
 187             else
 188                 p_buffer->i_pts += p_sys->i_delay;
 189
 190             input_DecoderDecode( (decoder_t *)id, p_buffer, false );
 191         }
 192
 193         p_buffer = p_next;
 194     }
 195
 196     return VLC_SUCCESS;
 197 }