1 /*****************************************************************************
2 * screen.c: Screen capture module.
3 *****************************************************************************
4 * Copyright (C) 2004 the VideoLAN team
7 * Authors: Gildas Bazin <gbazin@videolan.org>
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.
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.
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 *****************************************************************************/
24 /*****************************************************************************
26 *****************************************************************************/
35 /*****************************************************************************
37 *****************************************************************************/
38 #define CACHING_TEXT N_("Caching value in ms")
39 #define CACHING_LONGTEXT N_( \
40 "Caching value for screen capture. "\
41 "This value should be set in milliseconds." )
42 #define FPS_TEXT N_("Frame rate")
43 #define FPS_LONGTEXT N_( \
44 "Desired frame rate for the capture." )
47 #define FRAGS_TEXT N_("Capture fragment size")
48 #define FRAGS_LONGTEXT N_( \
49 "Optimize the capture by fragmenting the screen in chunks " \
50 "of predefined height (16 might be a good value, and 0 means disabled)." )
53 static int Open ( vlc_object_t * );
54 static void Close( vlc_object_t * );
63 set_description( _("Screen Input") );
64 set_shortname( _("Screen" ));
65 set_category( CAT_INPUT );
66 set_subcategory( SUBCAT_INPUT_ACCESS );
68 add_integer( "screen-caching", DEFAULT_PTS_DELAY / 1000, NULL,
69 CACHING_TEXT, CACHING_LONGTEXT, true );
70 add_float( "screen-fps", SCREEN_FPS, 0, FPS_TEXT, FPS_LONGTEXT, true );
73 add_integer( "screen-fragment-size", 0, NULL, FRAGS_TEXT,
74 FRAGS_LONGTEXT, true );
77 set_capability( "access_demux", 0 );
78 add_shortcut( "screen" );
79 set_callbacks( Open, Close );
82 /*****************************************************************************
84 *****************************************************************************/
85 static int Control( demux_t *, int, va_list );
86 static int Demux ( demux_t * );
88 /*****************************************************************************
90 *****************************************************************************/
91 static int Open( vlc_object_t *p_this )
93 demux_t *p_demux = (demux_t*)p_this;
97 /* Fill p_demux field */
98 p_demux->pf_demux = Demux;
99 p_demux->pf_control = Control;
100 p_demux->p_sys = p_sys = malloc( sizeof( demux_sys_t ) );
101 memset( p_sys, 0, sizeof( demux_sys_t ) );
103 /* Update default_pts to a suitable value for screen access */
104 var_Create( p_demux, "screen-caching", VLC_VAR_INTEGER|VLC_VAR_DOINHERIT );
106 var_Create( p_demux, "screen-fps", VLC_VAR_FLOAT|VLC_VAR_DOINHERIT );
107 var_Get( p_demux, "screen-fps", &val );
108 p_sys->f_fps = val.f_float;
109 p_sys->i_incr = 1000000 / val.f_float;
110 p_sys->i_next_date = 0;
112 if( screen_InitCapture( p_demux ) != VLC_SUCCESS )
118 msg_Dbg( p_demux, "screen width: %i, height: %i, depth: %i",
119 p_sys->fmt.video.i_width, p_sys->fmt.video.i_height,
120 p_sys->fmt.video.i_bits_per_pixel );
122 p_sys->es = es_out_Add( p_demux->out, &p_sys->fmt );
127 /*****************************************************************************
129 *****************************************************************************/
130 static void Close( vlc_object_t *p_this )
132 demux_t *p_demux = (demux_t*)p_this;
133 demux_sys_t *p_sys = p_demux->p_sys;
135 screen_CloseCapture( p_demux );
139 /*****************************************************************************
141 *****************************************************************************/
142 static int Demux( demux_t *p_demux )
144 demux_sys_t *p_sys = p_demux->p_sys;
147 if( !p_sys->i_next_date ) p_sys->i_next_date = mdate();
149 /* Frame skipping if necessary */
150 while( mdate() >= p_sys->i_next_date + p_sys->i_incr )
151 p_sys->i_next_date += p_sys->i_incr;
153 mwait( p_sys->i_next_date );
154 p_block = screen_Capture( p_demux );
157 p_sys->i_next_date += p_sys->i_incr;
161 p_block->i_dts = p_block->i_pts = p_sys->i_next_date;
163 es_out_Control( p_demux->out, ES_OUT_SET_PCR, p_block->i_pts );
164 es_out_Send( p_demux->out, p_sys->es, p_block );
166 p_sys->i_next_date += p_sys->i_incr;
171 /*****************************************************************************
173 *****************************************************************************/
174 static int Control( demux_t *p_demux, int i_query, va_list args )
181 /* Special for access_demux */
182 case DEMUX_CAN_PAUSE:
184 case DEMUX_CAN_CONTROL_PACE:
186 pb = (bool*)va_arg( args, bool * );
190 case DEMUX_GET_PTS_DELAY:
191 pi64 = (int64_t*)va_arg( args, int64_t * );
192 *pi64 = (int64_t)var_GetInteger( p_demux, "screen-caching" ) *1000;
195 /* TODO implement others */