mirror of
https://code.videolan.org/videolan/vlc
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225 lines
7.6 KiB
C
225 lines
7.6 KiB
C
/*****************************************************************************
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* canvas.c : automatically resize and padd a video to fit in canvas
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*****************************************************************************
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* Copyright (C) 2008 the VideoLAN team
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* $Id$
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*
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* Authors: Antoine Cellerier <dionoea at videolan dot org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 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 General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, 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 <limits.h>
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#include <vlc_common.h>
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#include <vlc_plugin.h>
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#include <vlc_filter.h>
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#include <vlc_vout.h>
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/*****************************************************************************
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* Local and extern prototypes.
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*****************************************************************************/
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static int Activate( vlc_object_t * );
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static void Destroy( vlc_object_t * );
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static picture_t *Filter( filter_t *, picture_t * );
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static int alloc_init( filter_t *, void * );
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#define WIDTH_TEXT N_( "Image width" )
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#define WIDTH_LONGTEXT N_( \
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"Image width" )
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#define HEIGHT_TEXT N_( "Image height" )
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#define HEIGHT_LONGTEXT N_( \
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"Image height" )
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#define CFG_PREFIX "canvas-"
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/*****************************************************************************
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* Module descriptor
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*****************************************************************************/
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vlc_module_begin();
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set_description( N_("Automatically resize and padd a video") );
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set_capability( "video filter2", 0 );
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set_callbacks( Activate, Destroy );
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add_integer_with_range( CFG_PREFIX "width", 0, 0, INT_MAX, NULL,
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WIDTH_TEXT, WIDTH_LONGTEXT, false );
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add_integer_with_range( CFG_PREFIX "height", 0, 0, INT_MAX, NULL,
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HEIGHT_TEXT, HEIGHT_LONGTEXT, false );
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vlc_module_end();
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static const char *const ppsz_filter_options[] = {
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"width", "height", NULL
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};
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struct filter_sys_t
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{
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filter_chain_t *p_chain;
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};
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/*****************************************************************************
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*
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*****************************************************************************/
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static int Activate( vlc_object_t *p_this )
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{
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filter_t *p_filter = (filter_t *)p_this;
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unsigned int i_width, i_height;
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es_format_t fmt;
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char psz_croppadd[100];
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int i_padd;
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if( !p_filter->b_allow_fmt_out_change )
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{
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msg_Err( p_filter, "Picture format change isn't allowed" );
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return VLC_EGENERIC;
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}
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if( p_filter->fmt_in.video.i_chroma != p_filter->fmt_out.video.i_chroma )
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{
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msg_Err( p_filter, "Input and output chromas don't match" );
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return VLC_EGENERIC;
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}
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config_ChainParse( p_filter, CFG_PREFIX, ppsz_filter_options,
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p_filter->p_cfg );
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i_width = var_CreateGetInteger( p_filter, CFG_PREFIX "width" );
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i_height = var_CreateGetInteger( p_filter, CFG_PREFIX "height" );
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if( i_width == 0 || i_height == 0 )
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{
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msg_Err( p_filter, "Width and height options must be set" );
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return VLC_EGENERIC;
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}
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if( i_width & 1 || i_height & 1 )
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{
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msg_Err( p_filter, "Width and height options must be even integers" );
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return VLC_EGENERIC;
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}
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filter_sys_t *p_sys = (filter_sys_t *)malloc( sizeof( filter_sys_t ) );
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if( !p_sys )
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return VLC_ENOMEM;
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p_filter->p_sys = p_sys;
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p_sys->p_chain = filter_chain_New( p_filter, "video filter2", true,
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alloc_init, NULL, p_filter );
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if( !p_sys->p_chain )
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{
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msg_Err( p_filter, "Could not allocate filter chain" );
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free( p_sys );
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return VLC_EGENERIC;
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}
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es_format_Copy( &fmt, &p_filter->fmt_in );
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fmt.video.i_width = i_width;
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fmt.video.i_height = ( p_filter->fmt_in.video.i_height * i_width )
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/ p_filter->fmt_in.video.i_width;
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if( fmt.video.i_height > i_height )
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{
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fmt.video.i_height = i_height;
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fmt.video.i_width = ( p_filter->fmt_in.video.i_width * i_height )
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/ p_filter->fmt_in.video.i_height;
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if( fmt.video.i_width & 1 ) fmt.video.i_width -= 1;
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i_padd = i_width - fmt.video.i_width;
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/* Gruik */
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snprintf( psz_croppadd, 100, "croppadd{paddleft=%d,paddright=%d}",
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i_padd/2, (i_padd+1)/2 );
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}
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else
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{
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if( fmt.video.i_height & 1 ) fmt.video.i_height -= 1;
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i_padd = i_height - fmt.video.i_height;
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/* Gruik */
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snprintf( psz_croppadd, 100, "croppadd{paddtop=%d,paddbottom=%d}",
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i_padd/2, (i_padd+1)/2 );
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}
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fmt.video.i_visible_width = fmt.video.i_width;
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fmt.video.i_visible_height = fmt.video.i_height;
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filter_chain_Reset( p_sys->p_chain, &p_filter->fmt_in, &fmt );
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/* Append scaling module */
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filter_chain_AppendFilter( p_sys->p_chain, NULL, NULL, NULL, NULL );
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/* Append padding module */
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filter_chain_AppendFromString( p_sys->p_chain, psz_croppadd );
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fmt = *filter_chain_GetFmtOut( p_sys->p_chain );
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es_format_Copy( &p_filter->fmt_out, &fmt );
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if( p_filter->fmt_out.video.i_width != i_width
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|| p_filter->fmt_out.video.i_height != i_height )
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{
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msg_Warn( p_filter, "Looks like something went wrong. "
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"Output size is %dx%d while we asked for %dx%d",
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p_filter->fmt_out.video.i_width,
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p_filter->fmt_out.video.i_height,
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i_width, i_height );
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}
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p_filter->pf_video_filter = Filter;
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return VLC_SUCCESS;
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}
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/*****************************************************************************
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*
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*****************************************************************************/
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static void Destroy( vlc_object_t *p_this )
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{
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filter_t *p_filter = (filter_t *)p_this;
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filter_chain_Delete( p_filter->p_sys->p_chain );
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free( p_filter->p_sys );
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}
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/*****************************************************************************
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*
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*****************************************************************************/
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static picture_t *Filter( filter_t *p_filter, picture_t *p_pic )
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{
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return filter_chain_VideoFilter( p_filter->p_sys->p_chain, p_pic );
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}
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/*****************************************************************************
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*
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*****************************************************************************/
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static picture_t *video_new( filter_t *p_filter )
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{
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return ((filter_t*)p_filter->p_owner)->pf_vout_buffer_new( (filter_t*)p_filter->p_owner );
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}
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static void video_del( filter_t *p_filter, picture_t *p_pic )
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{
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if( ((filter_t*)p_filter->p_owner)->pf_vout_buffer_del )
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((filter_t*)p_filter->p_owner)->pf_vout_buffer_del( (filter_t*)p_filter->p_owner, p_pic );
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}
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static int alloc_init( filter_t *p_filter, void *p_data )
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{
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p_filter->p_owner = p_data;
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p_filter->pf_vout_buffer_new = video_new;
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p_filter->pf_vout_buffer_del = video_del;
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return VLC_SUCCESS;
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}
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