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288 lines
8.6 KiB
288 lines
8.6 KiB
/*****************************************************************************
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* win32.c: Screen capture module.
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*****************************************************************************
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* Copyright (C) 2004-2011 VLC authors and VideoLAN
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* $Id$
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*
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* Authors: Gildas Bazin <gbazin@videolan.org>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation; either version 2.1 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
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*****************************************************************************/
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/*****************************************************************************
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* Preamble
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*****************************************************************************/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <vlc_common.h>
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#include "screen.h"
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struct screen_data_t
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{
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HDC hdc_src;
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HDC hdc_dst;
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BITMAPINFO bmi;
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HGDIOBJ hgdi_backup;
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int i_fragment_size;
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int i_fragment;
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block_t *p_block;
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};
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int screen_InitCapture( demux_t *p_demux )
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{
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demux_sys_t *p_sys = p_demux->p_sys;
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screen_data_t *p_data;
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int i_chroma, i_bits_per_pixel;
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p_sys->p_data = p_data = calloc( 1, sizeof( screen_data_t ) );
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if( !p_data )
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return VLC_ENOMEM;
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/* Get the device context for the whole screen */
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p_data->hdc_src = CreateDC( TEXT("DISPLAY"), NULL, NULL, NULL );
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if( !p_data->hdc_src )
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{
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msg_Err( p_demux, "cannot get device context" );
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free( p_data );
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return VLC_EGENERIC;
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}
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p_data->hdc_dst = CreateCompatibleDC( p_data->hdc_src );
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if( !p_data->hdc_dst )
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{
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msg_Err( p_demux, "cannot get compat device context" );
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free( p_data );
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ReleaseDC( 0, p_data->hdc_src );
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return VLC_EGENERIC;
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}
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i_bits_per_pixel = GetDeviceCaps( p_data->hdc_src, BITSPIXEL );
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switch( i_bits_per_pixel )
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{
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case 8: /* FIXME: set the palette */
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i_chroma = VLC_CODEC_RGB8; break;
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case 15:
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case 16: /* Yes it is really 15 bits (when using BI_RGB) */
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i_chroma = VLC_CODEC_RGB15; break;
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case 24:
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i_chroma = VLC_CODEC_RGB24; break;
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case 32:
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i_chroma = VLC_CODEC_RGB32; break;
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default:
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msg_Err( p_demux, "unknown screen depth %i", i_bits_per_pixel );
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DeleteDC( p_data->hdc_dst );
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ReleaseDC( 0, p_data->hdc_src );
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free( p_data );
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return VLC_EGENERIC;
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}
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es_format_Init( &p_sys->fmt, VIDEO_ES, i_chroma );
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p_sys->fmt.video.i_visible_width =
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p_sys->fmt.video.i_width = GetDeviceCaps( p_data->hdc_src, HORZRES );
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p_sys->fmt.video.i_visible_height =
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p_sys->fmt.video.i_height = GetDeviceCaps( p_data->hdc_src, VERTRES );
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p_sys->fmt.video.i_bits_per_pixel = i_bits_per_pixel;
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p_sys->fmt.video.i_sar_num = p_sys->fmt.video.i_sar_den = 1;
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p_sys->fmt.video.i_chroma = i_chroma;
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switch( i_chroma )
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{
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case VLC_CODEC_RGB15:
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p_sys->fmt.video.i_rmask = 0x7c00;
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p_sys->fmt.video.i_gmask = 0x03e0;
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p_sys->fmt.video.i_bmask = 0x001f;
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break;
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case VLC_CODEC_RGB24:
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p_sys->fmt.video.i_rmask = 0x00ff0000;
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p_sys->fmt.video.i_gmask = 0x0000ff00;
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p_sys->fmt.video.i_bmask = 0x000000ff;
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break;
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case VLC_CODEC_RGB32:
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p_sys->fmt.video.i_rmask = 0x00ff0000;
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p_sys->fmt.video.i_gmask = 0x0000ff00;
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p_sys->fmt.video.i_bmask = 0x000000ff;
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break;
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default:
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msg_Warn( p_demux, "Unknown RGB masks" );
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break;
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}
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return VLC_SUCCESS;
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}
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int screen_CloseCapture( demux_t *p_demux )
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{
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demux_sys_t *p_sys = p_demux->p_sys;
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screen_data_t *p_data = p_sys->p_data;
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if( p_data->p_block ) block_Release( p_data->p_block );
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if( p_data->hgdi_backup)
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SelectObject( p_data->hdc_dst, p_data->hgdi_backup );
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DeleteDC( p_data->hdc_dst );
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ReleaseDC( 0, p_data->hdc_src );
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free( p_data );
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return VLC_SUCCESS;
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}
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struct block_sys_t
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{
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block_t self;
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HBITMAP hbmp;
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};
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static void CaptureBlockRelease( block_t *p_block )
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{
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DeleteObject( ((struct block_sys_t *)p_block)->hbmp );
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free( p_block );
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}
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static block_t *CaptureBlockNew( demux_t *p_demux )
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{
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demux_sys_t *p_sys = p_demux->p_sys;
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screen_data_t *p_data = p_sys->p_data;
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struct block_sys_t *p_block;
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void *p_buffer;
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int i_buffer;
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HBITMAP hbmp;
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if( p_data->bmi.bmiHeader.biSize == 0 )
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{
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int i_val;
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/* Create the bitmap info header */
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p_data->bmi.bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
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p_data->bmi.bmiHeader.biWidth = p_sys->fmt.video.i_width;
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p_data->bmi.bmiHeader.biHeight = - p_sys->fmt.video.i_height;
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p_data->bmi.bmiHeader.biPlanes = 1;
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p_data->bmi.bmiHeader.biBitCount = p_sys->fmt.video.i_bits_per_pixel;
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p_data->bmi.bmiHeader.biCompression = BI_RGB;
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p_data->bmi.bmiHeader.biSizeImage = 0;
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p_data->bmi.bmiHeader.biXPelsPerMeter = 0;
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p_data->bmi.bmiHeader.biYPelsPerMeter = 0;
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p_data->bmi.bmiHeader.biClrUsed = 0;
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p_data->bmi.bmiHeader.biClrImportant = 0;
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i_val = var_CreateGetInteger( p_demux, "screen-fragment-size" );
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p_data->i_fragment_size = i_val > 0 ? i_val : (int)p_sys->fmt.video.i_height;
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p_data->i_fragment_size = i_val > (int)p_sys->fmt.video.i_height ?
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(int)p_sys->fmt.video.i_height :
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p_data->i_fragment_size;
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p_sys->f_fps *= (p_sys->fmt.video.i_height/p_data->i_fragment_size);
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p_sys->i_incr = 1000000 / p_sys->f_fps;
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p_data->i_fragment = 0;
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p_data->p_block = 0;
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}
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/* Create the bitmap storage space */
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hbmp = CreateDIBSection( p_data->hdc_dst, &p_data->bmi, DIB_RGB_COLORS,
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&p_buffer, NULL, 0 );
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if( !hbmp || !p_buffer )
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{
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msg_Err( p_demux, "cannot create bitmap" );
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goto error;
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}
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/* Select the bitmap into the compatible DC */
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if( !p_data->hgdi_backup )
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p_data->hgdi_backup = SelectObject( p_data->hdc_dst, hbmp );
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else
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SelectObject( p_data->hdc_dst, hbmp );
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if( !p_data->hgdi_backup )
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{
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msg_Err( p_demux, "cannot select bitmap" );
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goto error;
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}
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/* Build block */
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if( !(p_block = malloc( sizeof( block_t ) + sizeof( struct block_sys_t ) )) )
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goto error;
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/* Fill all fields */
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i_buffer = (p_sys->fmt.video.i_bits_per_pixel + 7) / 8 *
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p_sys->fmt.video.i_width * p_sys->fmt.video.i_height;
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block_Init( &p_block->self, p_buffer, i_buffer );
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p_block->self.pf_release = CaptureBlockRelease;
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p_block->hbmp = hbmp;
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return &p_block->self;
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error:
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if( hbmp ) DeleteObject( hbmp );
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return NULL;
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}
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block_t *screen_Capture( demux_t *p_demux )
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{
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demux_sys_t *p_sys = p_demux->p_sys;
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screen_data_t *p_data = p_sys->p_data;
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if( !p_data->i_fragment )
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{
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if( !( p_data->p_block = CaptureBlockNew( p_demux ) ) )
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{
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msg_Warn( p_demux, "cannot get block" );
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return NULL;
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}
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}
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if( p_sys->b_follow_mouse )
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{
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POINT pos;
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GetCursorPos( &pos );
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FollowMouse( p_sys, pos.x, pos.y );
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}
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if( !BitBlt( p_data->hdc_dst, 0,
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p_data->i_fragment * p_data->i_fragment_size,
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p_sys->fmt.video.i_width, p_data->i_fragment_size,
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p_data->hdc_src, p_sys->i_left, p_sys->i_top +
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p_data->i_fragment * p_data->i_fragment_size,
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SRCCOPY | CAPTUREBLT ) )
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{
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msg_Err( p_demux, "error during BitBlt()" );
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return NULL;
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}
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p_data->i_fragment++;
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if( !( p_data->i_fragment %
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(p_sys->fmt.video.i_height/p_data->i_fragment_size) ) )
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{
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block_t *p_block = p_data->p_block;
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p_data->i_fragment = 0;
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p_data->p_block = 0;
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if( p_sys->p_mouse )
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{
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POINT pos;
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GetCursorPos( &pos );
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RenderCursor( p_demux, pos.x, pos.y,
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p_block->p_buffer );
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}
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return p_block;
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}
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return NULL;
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}
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