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screen.c：源码内容
							/*****************************************************************************
 * screen.c: Screen capture module.
 *****************************************************************************
 * Copyright (C) 2004-2008 the VideoLAN team
 * $Id: e70b168e28e73de7807a70069f1f642b720f6b1d $
 *
 * 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 General Public License as published by
 * the Free Software Foundation; either version 2 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 General Public License for more details.
 *
 * You should have received a copy of the GNU 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 "screen.h"
/*****************************************************************************
 * Module descriptor
 *****************************************************************************/
#define CACHING_TEXT N_("Caching value in ms")
#define CACHING_LONGTEXT N_( 
    "Caching value for screen capture. "
    "This value should be set in milliseconds." )
#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_( "Subscreen top left corner" )
#define TOP_LONGTEXT N_( 
    "Top coordinate of the subscreen top left corner." )
#define LEFT_TEXT N_( "Subscreen top left corner" )
#define LEFT_LONGTEXT N_( 
    "Left coordinate of the subscreen top left corner." )
#define WIDTH_TEXT N_( "Subscreen width" )
#define WIDTH_LONGTEXT N_( 
    "Subscreen width" )
#define HEIGHT_TEXT N_( "Subscreen height" )
#define HEIGHT_LONGTEXT N_( 
    "Subscreen height"  )
#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 specifed, will use the image to draw the mouse pointer on the " 
    "capture." )
#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_integer( "screen-caching", DEFAULT_PTS_DELAY / 1000, NULL,
        CACHING_TEXT, CACHING_LONGTEXT, true )
    add_float( "screen-fps", SCREEN_FPS, 0, FPS_TEXT, FPS_LONGTEXT, true )
#ifdef SCREEN_SUBSCREEN
    add_integer( "screen-top", 0, NULL, TOP_TEXT, TOP_LONGTEXT, true )
    add_integer( "screen-left", 0, NULL, LEFT_TEXT, LEFT_LONGTEXT, true )
    add_integer( "screen-width", 0, NULL, WIDTH_TEXT, WIDTH_LONGTEXT, true )
    add_integer( "screen-height", 0, NULL, HEIGHT_TEXT, HEIGHT_LONGTEXT, true )
    add_bool( "screen-follow-mouse", false, NULL, FOLLOW_MOUSE_TEXT,
              FOLLOW_MOUSE_LONGTEXT, true )
#endif
#ifdef SCREEN_MOUSE
    add_file( "screen-mouse-image", "", NULL, MOUSE_TEXT, MOUSE_LONGTEXT,
              true )
#endif
#ifdef WIN32
    add_integer( "screen-fragment-size", 0, NULL, FRAGS_TEXT,
        FRAGS_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;
    /* Update default_pts to a suitable value for screen access */
    var_Create( p_demux, "screen-caching", VLC_VAR_INTEGER|VLC_VAR_DOINHERIT );
    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
    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_CreateGetInteger( p_demux,
                                                "screen-follow-mouse" );
            if( p_sys->b_follow_mouse )
                msg_Dbg( p_demux, "mouse following enabled" );
        }
    }
#endif
#ifdef SCREEN_MOUSE
    char * psz_mouse = var_CreateGetNonEmptyString( p_demux,
                                                    "screen-mouse-image" );
    if( psz_mouse )
    {
        image_handler_t *p_image;
        video_format_t fmt_in, fmt_out;
        msg_Dbg( p_demux, "Using %s for the mouse pointer image", psz_mouse );
        memset( &fmt_in, 0, sizeof( fmt_in ) );
        memset( &fmt_out, 0, sizeof( fmt_out ) );
        fmt_out.i_chroma = VLC_FOURCC('R','G','B','A');
        p_image = image_HandlerCreate( p_demux );
        if( p_image )
        {
            p_sys->p_mouse =
                image_ReadUrl( p_image, psz_mouse, &fmt_in, &fmt_out );
            image_HandlerDelete( p_image );
        }
        if( !p_sys->p_mouse )
            msg_Err( p_demux, "Failed to open mouse pointer image (%s)",
                     psz_mouse );
        free( psz_mouse );
    }
#endif
    p_sys->es = es_out_Add( p_demux->out, &p_sys->fmt );
    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;
    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_t)var_GetInteger( p_demux, "screen-caching" ) *1000;
            return VLC_SUCCESS;
        case DEMUX_GET_TIME:
            pi64 = (int64_t*)va_arg( args, int64_t * );
            *pi64 = mdate();
            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 )
        vout_InitPicture( p_demux, &p_sys->dst,
                          p_sys->fmt.video.i_chroma,
                          p_sys->fmt.video.i_width,
                          p_sys->fmt.video.i_height,
                          p_sys->fmt.video.i_aspect );
    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_FOURCC('R','G','B','A') );
            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_detach( p_sys->p_blend );
                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

						