video_text.c
资源名称:vlc-1.0.5.zip [点击查看]
上传用户:kjfoods
上传日期:2020-07-06
资源大小:29949k
文件大小:6k
源码类别:
midi
开发平台:
Unix_Linux
- /*****************************************************************************
- * video_text.c : text manipulation functions
- *****************************************************************************
- * Copyright (C) 1999-2007 the VideoLAN team
- * $Id: d0e7a0ac3c7ca4e8faea8c94bf2f1891c5a2aa94 $
- *
- * Author: Sigmund Augdal Helberg <dnumgis@videolan.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.
- *****************************************************************************/
- #ifdef HAVE_CONFIG_H
- # include "config.h"
- #endif
- #include <vlc_common.h>
- #include <vlc_vout.h>
- #include <vlc_block.h>
- #include <vlc_filter.h>
- #include <vlc_osd.h>
- /**
- * brief Show text on the video for some time
- * param p_vout pointer to the vout the text is to be showed on
- * param i_channel Subpicture channel
- * param psz_string The text to be shown
- * param p_style Pointer to a struct with text style info
- * param i_flags flags for alignment and such
- * param i_hmargin horizontal margin in pixels
- * param i_vmargin vertical margin in pixels
- * param i_duration Amount of time the text is to be shown.
- */
- int vout_ShowTextRelative( vout_thread_t *p_vout, int i_channel,
- char *psz_string, text_style_t *p_style,
- int i_flags, int i_hmargin, int i_vmargin,
- mtime_t i_duration )
- {
- mtime_t i_now = mdate();
- return vout_ShowTextAbsolute( p_vout, i_channel, psz_string,
- p_style, i_flags, i_hmargin, i_vmargin,
- i_now, i_now + i_duration );
- }
- /**
- * brief Show text on the video from a given start date to a given end date
- * param p_vout pointer to the vout the text is to be showed on
- * param i_channel Subpicture channel
- * param psz_string The text to be shown
- * param p_style Pointer to a struct with text style info
- * param i_flags flags for alignment and such
- * param i_hmargin horizontal margin in pixels
- * param i_vmargin vertical margin in pixels
- * param i_start the time when this string is to appear on the video
- * param i_stop the time when this string should stop to be displayed
- * if this is 0 the string will be shown untill the next string
- * is about to be shown
- */
- int vout_ShowTextAbsolute( vout_thread_t *p_vout, int i_channel,
- const char *psz_string, text_style_t *p_style,
- int i_flags, int i_hmargin, int i_vmargin,
- mtime_t i_start, mtime_t i_stop )
- {
- (void)p_style;
- subpicture_t *p_spu;
- video_format_t fmt;
- /* (void)p_style; FIXME: <-- why ask for this if it's unused?!? */
- if( !psz_string ) return VLC_EGENERIC;
- p_spu = subpicture_New();
- if( !p_spu )
- return VLC_EGENERIC;
- p_spu->i_channel = i_channel;
- p_spu->i_start = i_start;
- p_spu->i_stop = i_stop;
- p_spu->b_ephemer = true;
- p_spu->b_absolute = false;
- p_spu->b_fade = true;
- /* Create a new subpicture region */
- memset( &fmt, 0, sizeof(video_format_t) );
- fmt.i_chroma = VLC_FOURCC('T','E','X','T');
- fmt.i_aspect = 0;
- fmt.i_width = fmt.i_height = 0;
- fmt.i_x_offset = fmt.i_y_offset = 0;
- p_spu->p_region = subpicture_region_New( &fmt );
- if( !p_spu->p_region )
- {
- msg_Err( p_vout, "cannot allocate SPU region" );
- subpicture_Delete( p_spu );
- return VLC_EGENERIC;
- }
- p_spu->p_region->psz_text = strdup( psz_string );
- p_spu->p_region->i_align = i_flags & SUBPICTURE_ALIGN_MASK;
- p_spu->p_region->i_x = i_hmargin;
- p_spu->p_region->i_y = i_vmargin;
- spu_DisplaySubpicture( p_vout->p_spu, p_spu );
- return VLC_SUCCESS;
- }
- /**
- * brief Write an informative message at the default location,
- * for the default duration and only if the OSD option is enabled.
- * param p_caller The object that called the function.
- * param i_channel Subpicture channel
- * param psz_format printf style formatting
- **/
- void __vout_OSDMessage( vlc_object_t *p_caller, int i_channel,
- const char *psz_format, ... )
- {
- vout_thread_t *p_vout;
- char *psz_string = NULL;
- va_list args;
- if( !config_GetInt( p_caller, "osd" ) ) return;
- p_vout = vlc_object_find( p_caller, VLC_OBJECT_VOUT, FIND_ANYWHERE );
- if( p_vout )
- {
- va_start( args, psz_format );
- if( vasprintf( &psz_string, psz_format, args ) != -1 )
- {
- vout_ShowTextRelative( p_vout, i_channel, psz_string, NULL,
- OSD_ALIGN_TOP|OSD_ALIGN_RIGHT,
- 30 + p_vout->fmt_in.i_width
- - p_vout->fmt_in.i_visible_width
- - p_vout->fmt_in.i_x_offset,
- 20 + p_vout->fmt_in.i_y_offset, 1000000 );
- free( psz_string );
- }
- vlc_object_release( p_vout );
- va_end( args );
- }
- }