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vlc/modules/access/screen/screen.c

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/*****************************************************************************
* screen.c: Screen capture module.
*****************************************************************************
* Copyright (C) 2004-2008 VLC authors and VideoLAN
* $Id$
*
* Authors: Gildas Bazin <gbazin@videolan.org>
* Antoine Cellerier <dionoea at videolan dot org>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
*****************************************************************************/
/*****************************************************************************
* Preamble
*****************************************************************************/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <vlc_common.h>
#include <vlc_plugin.h>
#include <vlc_modules.h> /* module_need for "video blending" */
#include <vlc_filter.h>
#include <vlc_url.h>
#include "screen.h"
/*****************************************************************************
* Module descriptor
*****************************************************************************/
#define FPS_TEXT N_("Frame rate")
#define FPS_LONGTEXT N_( \
"Desired frame rate for the capture." )
#ifdef _WIN32
#define FRAGS_TEXT N_("Capture fragment size")
#define FRAGS_LONGTEXT N_( \
"Optimize the capture by fragmenting the screen in chunks " \
"of predefined height (16 might be a good value, and 0 means disabled)." )
#endif
#ifdef SCREEN_SUBSCREEN
#define TOP_TEXT N_( "Region top row" )
#define TOP_LONGTEXT N_( \
"Ordinate of the capture region in pixels." )
#define LEFT_TEXT N_( "Region left column" )
#define LEFT_LONGTEXT N_( \
"Abscissa of the capture region in pixels." )
#define WIDTH_TEXT N_( "Capture region width" )
#define HEIGHT_TEXT N_( "Capture region heigh" )
#define FOLLOW_MOUSE_TEXT N_( "Follow the mouse" )
#define FOLLOW_MOUSE_LONGTEXT N_( \
"Follow the mouse when capturing a subscreen." )
#endif
#ifdef SCREEN_MOUSE
#define MOUSE_TEXT N_( "Mouse pointer image" )
#define MOUSE_LONGTEXT N_( \
"If specified, will use the image to draw the mouse pointer on the " \
"capture." )
#endif
#ifdef SCREEN_DISPLAY_ID
#define DISPLAY_ID_TEXT N_( "Display ID" )
#define DISPLAY_ID_LONGTEXT N_( \
"Display ID. If not specified, main display ID is used. " )
#define INDEX_TEXT N_( "Screen index" )
#define INDEX_LONGTEXT N_( \
"Index of screen (1, 2, 3, ...). Alternative to Display ID." )
#endif
static int Open ( vlc_object_t * );
static void Close( vlc_object_t * );
#ifdef _WIN32
# define SCREEN_FPS 1
#else
# define SCREEN_FPS 5
#endif
vlc_module_begin ()
set_description( N_("Screen Input") )
set_shortname( N_("Screen" ))
set_category( CAT_INPUT )
set_subcategory( SUBCAT_INPUT_ACCESS )
add_float( "screen-fps", SCREEN_FPS, FPS_TEXT, FPS_LONGTEXT, false )
#ifdef SCREEN_SUBSCREEN
add_integer( "screen-top", 0, TOP_TEXT, TOP_LONGTEXT, true )
add_integer( "screen-left", 0, LEFT_TEXT, LEFT_LONGTEXT, true )
add_integer( "screen-width", 0, WIDTH_TEXT, WIDTH_TEXT, true )
add_integer( "screen-height", 0, HEIGHT_TEXT, HEIGHT_TEXT, true )
add_bool( "screen-follow-mouse", false, FOLLOW_MOUSE_TEXT,
FOLLOW_MOUSE_LONGTEXT, false )
#endif
#ifdef SCREEN_MOUSE
add_loadfile( "screen-mouse-image", "", MOUSE_TEXT, MOUSE_LONGTEXT, true )
#endif
#ifdef _WIN32
add_integer( "screen-fragment-size", 0, FRAGS_TEXT, FRAGS_LONGTEXT, true )
#endif
#ifdef SCREEN_DISPLAY_ID
add_integer( "screen-display-id", 0, DISPLAY_ID_TEXT, DISPLAY_ID_LONGTEXT, true )
add_integer( "screen-index", 0, INDEX_TEXT, INDEX_LONGTEXT, true )
#endif
set_capability( "access_demux", 0 )
add_shortcut( "screen" )
set_callbacks( Open, Close )
vlc_module_end ()
/*****************************************************************************
* Local prototypes
*****************************************************************************/
static int Control( demux_t *, int, va_list );
static int Demux ( demux_t * );
/*****************************************************************************
* DemuxOpen:
*****************************************************************************/
static int Open( vlc_object_t *p_this )
{
demux_t *p_demux = (demux_t*)p_this;
demux_sys_t *p_sys;
/* Fill p_demux field */
p_demux->pf_demux = Demux;
p_demux->pf_control = Control;
p_demux->p_sys = p_sys = calloc( 1, sizeof( demux_sys_t ) );
if( !p_sys )
return VLC_ENOMEM;
p_sys->f_fps = var_CreateGetFloat( p_demux, "screen-fps" );
p_sys->i_incr = 1000000 / p_sys->f_fps;;
p_sys->i_next_date = 0;
#ifdef SCREEN_SUBSCREEN
p_sys->i_top = var_CreateGetInteger( p_demux, "screen-top" );
p_sys->i_left = var_CreateGetInteger( p_demux, "screen-left" );
p_sys->i_width = var_CreateGetInteger( p_demux, "screen-width" );
p_sys->i_height = var_CreateGetInteger( p_demux, "screen-height" );
if( p_sys->i_width > 0 && p_sys->i_height > 0 )
msg_Dbg( p_demux, "capturing subscreen top: %d, left: %d, "
"width: %d, height: %d",
p_sys->i_top,
p_sys->i_left,
p_sys->i_width,
p_sys->i_height );
#endif
#ifdef SCREEN_DISPLAY_ID
p_sys->i_display_id = var_CreateGetInteger( p_demux, "screen-display-id" );
p_sys->i_screen_index = var_CreateGetInteger( p_demux, "screen-index" );
#endif
if( screen_InitCapture( p_demux ) != VLC_SUCCESS )
{
free( p_sys );
return VLC_EGENERIC;
}
msg_Dbg( p_demux, "screen width: %i, height: %i, depth: %i",
p_sys->fmt.video.i_width, p_sys->fmt.video.i_height,
p_sys->fmt.video.i_bits_per_pixel );
#ifdef SCREEN_SUBSCREEN
if( p_sys->i_width > 0 && p_sys->i_height > 0 )
{
if( p_sys->i_left + p_sys->i_width > p_sys->fmt.video.i_width ||
p_sys->i_top + p_sys->i_height > p_sys->fmt.video.i_height )
{
msg_Err( p_demux, "subscreen region overflows the screen" );
free( p_sys );
return VLC_EGENERIC;
}
else
{
p_sys->i_screen_width = p_sys->fmt.video.i_width;
p_sys->i_screen_height = p_sys->fmt.video.i_height;
p_sys->fmt.video.i_visible_width =
p_sys->fmt.video.i_width = p_sys->i_width;
p_sys->fmt.video.i_visible_height =
p_sys->fmt.video.i_height = p_sys->i_height;
p_sys->b_follow_mouse = var_CreateGetBool( p_demux,
"screen-follow-mouse" );
if( p_sys->b_follow_mouse )
msg_Dbg( p_demux, "mouse following enabled" );
}
}
#endif
#ifdef SCREEN_MOUSE
char *mousefile = var_InheritString( p_demux, "screen-mouse-image" );
char *mouseurl = mousefile ? vlc_path2uri( mousefile, NULL ) : NULL;
free( mousefile );
if( mouseurl )
{
image_handler_t *p_image;
video_format_t fmt_in, fmt_out;
msg_Dbg( p_demux, "Using %s for the mouse pointer image", mouseurl );
memset( &fmt_in, 0, sizeof( fmt_in ) );
memset( &fmt_out, 0, sizeof( fmt_out ) );
fmt_out.i_chroma = VLC_CODEC_RGBA;
p_image = image_HandlerCreate( p_demux );
if( p_image )
{
p_sys->p_mouse =
image_ReadUrl( p_image, mouseurl, &fmt_in, &fmt_out );
image_HandlerDelete( p_image );
}
if( !p_sys->p_mouse )
msg_Err( p_demux, "Failed to open mouse pointer image (%s)",
mouseurl );
free( mouseurl );
}
#endif
p_sys->es = es_out_Add( p_demux->out, &p_sys->fmt );
p_sys->i_start = mdate();
return VLC_SUCCESS;
}
/*****************************************************************************
* Close:
*****************************************************************************/
static void Close( vlc_object_t *p_this )
{
demux_t *p_demux = (demux_t*)p_this;
demux_sys_t *p_sys = p_demux->p_sys;
screen_CloseCapture( p_demux );
#ifdef SCREEN_MOUSE
if( p_sys->p_mouse )
picture_Release( p_sys->p_mouse );
#endif
free( p_sys );
}
/*****************************************************************************
* Demux:
*****************************************************************************/
static int Demux( demux_t *p_demux )
{
demux_sys_t *p_sys = p_demux->p_sys;
block_t *p_block;
if( !p_sys->i_next_date ) p_sys->i_next_date = mdate();
/* Frame skipping if necessary */
while( mdate() >= p_sys->i_next_date + p_sys->i_incr )
p_sys->i_next_date += p_sys->i_incr;
mwait( p_sys->i_next_date );
p_block = screen_Capture( p_demux );
if( !p_block )
{
p_sys->i_next_date += p_sys->i_incr;
return 1;
}
p_block->i_dts = p_block->i_pts = p_sys->i_next_date;
es_out_Control( p_demux->out, ES_OUT_SET_PCR, p_block->i_pts );
es_out_Send( p_demux->out, p_sys->es, p_block );
p_sys->i_next_date += p_sys->i_incr;
return 1;
}
/*****************************************************************************
* Control:
*****************************************************************************/
static int Control( demux_t *p_demux, int i_query, va_list args )
{
bool *pb;
int64_t *pi64;
demux_sys_t *p_sys = p_demux->p_sys;
switch( i_query )
{
/* Special for access_demux */
case DEMUX_CAN_PAUSE:
case DEMUX_CAN_SEEK:
case DEMUX_CAN_CONTROL_PACE:
/* TODO */
pb = (bool*)va_arg( args, bool * );
*pb = false;
return VLC_SUCCESS;
case DEMUX_GET_PTS_DELAY:
pi64 = (int64_t*)va_arg( args, int64_t * );
*pi64 = INT64_C(1000)
* var_InheritInteger( p_demux, "live-caching" );
return VLC_SUCCESS;
case DEMUX_GET_TIME:
pi64 = (int64_t*)va_arg( args, int64_t * );
*pi64 = mdate() - p_sys->i_start;
return VLC_SUCCESS;
/* TODO implement others */
default:
return VLC_EGENERIC;
}
}
#ifdef SCREEN_SUBSCREEN
void FollowMouse( demux_sys_t *p_sys, int i_x, int i_y )
{
i_x -= p_sys->i_width/2;
if( i_x < 0 ) i_x = 0;
p_sys->i_left = __MIN( (unsigned int)i_x,
p_sys->i_screen_width - p_sys->i_width );
i_y -= p_sys->i_height/2;
if( i_y < 0 ) i_y = 0;
p_sys->i_top = __MIN( (unsigned int)i_y,
p_sys->i_screen_height - p_sys->i_height );
}
#endif
#ifdef SCREEN_MOUSE
void RenderCursor( demux_t *p_demux, int i_x, int i_y,
uint8_t *p_dst )
{
demux_sys_t *p_sys = p_demux->p_sys;
if( !p_sys->dst.i_planes )
picture_Setup( &p_sys->dst, &p_sys->fmt.video );
if( !p_sys->p_blend )
{
p_sys->p_blend = vlc_object_create( p_demux, sizeof(filter_t) );
if( p_sys->p_blend )
{
es_format_Init( &p_sys->p_blend->fmt_in, VIDEO_ES,
VLC_CODEC_RGBA );
p_sys->p_blend->fmt_in.video = p_sys->p_mouse->format;
p_sys->p_blend->fmt_out = p_sys->fmt;
p_sys->p_blend->p_module =
module_need( p_sys->p_blend, "video blending", NULL, false );
if( !p_sys->p_blend->p_module )
{
msg_Err( p_demux, "Could not load video blending module" );
vlc_object_release( p_sys->p_blend );
p_sys->p_blend = NULL;
}
}
}
if( p_sys->p_blend )
{
p_sys->dst.p->p_pixels = p_dst;
p_sys->p_blend->pf_video_blend( p_sys->p_blend,
&p_sys->dst,
p_sys->p_mouse,
#ifdef SCREEN_SUBSCREEN
i_x-p_sys->i_left,
#else
i_x,
#endif
#ifdef SCREEN_SUBSCREEN
i_y-p_sys->i_top,
#else
i_y,
#endif
255 );
}
else
{
picture_Release( p_sys->p_mouse );
p_sys->p_mouse = NULL;
}
}
#endif