crop.c
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上传日期:2009-03-27
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文件大小:17k
- /*****************************************************************************
- * crop.c : Crop video plugin for vlc
- *****************************************************************************
- * Copyright (C) 2002, 2003 VideoLAN
- * $Id: crop.c 8551 2004-08-28 17:36:02Z gbazin $
- *
- * Authors: Samuel Hocevar <sam@zoy.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., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
- *****************************************************************************/
- /*****************************************************************************
- * Preamble
- *****************************************************************************/
- #include <stdlib.h> /* malloc(), free() */
- #include <string.h>
- #include <vlc/vlc.h>
- #include <vlc/vout.h>
- #include "filter_common.h"
- /*****************************************************************************
- * Local prototypes
- *****************************************************************************/
- static int Create ( vlc_object_t * );
- static void Destroy ( vlc_object_t * );
- static int Init ( vout_thread_t * );
- static void End ( vout_thread_t * );
- static int Manage ( vout_thread_t * );
- static void Render ( vout_thread_t *, picture_t * );
- static void UpdateStats ( vout_thread_t *, picture_t * );
- static int SendEvents( vlc_object_t *, char const *,
- vlc_value_t, vlc_value_t, void * );
- /*****************************************************************************
- * Module descriptor
- *****************************************************************************/
- #define GEOMETRY_TEXT N_("Crop geometry (pixels)")
- #define GEOMETRY_LONGTEXT N_("Set the geometry of the zone to crop. This is set as <width> x <height> + <left offset> + <top offset>.")
- #define AUTOCROP_TEXT N_("Automatic cropping")
- #define AUTOCROP_LONGTEXT N_("Activate automatic black border cropping.")
- vlc_module_begin();
- set_description( _("Crop video filter") );
- set_capability( "video filter", 0 );
- add_string( "crop-geometry", NULL, NULL, GEOMETRY_TEXT, GEOMETRY_LONGTEXT, VLC_FALSE );
- add_bool( "autocrop", 0, NULL, AUTOCROP_TEXT, AUTOCROP_LONGTEXT, VLC_FALSE );
- add_shortcut( "crop" );
- set_callbacks( Create, Destroy );
- vlc_module_end();
- /*****************************************************************************
- * vout_sys_t: Crop video output method descriptor
- *****************************************************************************
- * This structure is part of the video output thread descriptor.
- * It describes the Crop specific properties of an output thread.
- *****************************************************************************/
- struct vout_sys_t
- {
- vout_thread_t *p_vout;
- unsigned int i_x, i_y;
- unsigned int i_width, i_height, i_aspect;
- vlc_bool_t b_autocrop;
- /* Autocrop specific variables */
- unsigned int i_lastchange;
- vlc_bool_t b_changed;
- };
- /*****************************************************************************
- * Control: control facility for the vout (forwards to child vout)
- *****************************************************************************/
- static int Control( vout_thread_t *p_vout, int i_query, va_list args )
- {
- return vout_vaControl( p_vout->p_sys->p_vout, i_query, args );
- }
- /*****************************************************************************
- * Create: allocates Crop video thread output method
- *****************************************************************************
- * This function allocates and initializes a Crop vout method.
- *****************************************************************************/
- static int Create( vlc_object_t *p_this )
- {
- vout_thread_t *p_vout = (vout_thread_t *)p_this;
- /* Allocate structure */
- p_vout->p_sys = malloc( sizeof( vout_sys_t ) );
- if( p_vout->p_sys == NULL )
- {
- msg_Err( p_vout, "out of memory" );
- return VLC_ENOMEM;
- }
- p_vout->pf_init = Init;
- p_vout->pf_end = End;
- p_vout->pf_manage = Manage;
- p_vout->pf_render = Render;
- p_vout->pf_display = NULL;
- p_vout->pf_control = Control;
- return VLC_SUCCESS;
- }
- /*****************************************************************************
- * Init: initialize Crop video thread output method
- *****************************************************************************/
- static int Init( vout_thread_t *p_vout )
- {
- int i_index;
- char *psz_var;
- picture_t *p_pic;
- I_OUTPUTPICTURES = 0;
- p_vout->p_sys->i_lastchange = 0;
- p_vout->p_sys->b_changed = VLC_FALSE;
- /* Initialize the output structure */
- p_vout->output.i_chroma = p_vout->render.i_chroma;
- p_vout->output.i_width = p_vout->render.i_width;
- p_vout->output.i_height = p_vout->render.i_height;
- p_vout->output.i_aspect = p_vout->render.i_aspect;
- /* Shall we use autocrop ? */
- p_vout->p_sys->b_autocrop = config_GetInt( p_vout, "autocrop" );
- /* Get geometry value from the user */
- psz_var = config_GetPsz( p_vout, "crop-geometry" );
- if( psz_var )
- {
- char *psz_parser, *psz_tmp;
- psz_parser = psz_tmp = psz_var;
- while( *psz_tmp && *psz_tmp != 'x' ) psz_tmp++;
- if( *psz_tmp )
- {
- psz_tmp[0] = ' ';
- p_vout->p_sys->i_width = atoi( psz_parser );
- psz_parser = ++psz_tmp;
- while( *psz_tmp && *psz_tmp != '+' ) psz_tmp++;
- if( *psz_tmp )
- {
- psz_tmp[0] = ' ';
- p_vout->p_sys->i_height = atoi( psz_parser );
- psz_parser = ++psz_tmp;
- while( *psz_tmp && *psz_tmp != '+' ) psz_tmp++;
- if( *psz_tmp )
- {
- psz_tmp[0] = ' ';
- p_vout->p_sys->i_x = atoi( psz_parser );
- p_vout->p_sys->i_y = atoi( ++psz_tmp );
- }
- else
- {
- p_vout->p_sys->i_x = atoi( psz_parser );
- p_vout->p_sys->i_y =
- ( p_vout->output.i_height - p_vout->p_sys->i_height ) / 2;
- }
- }
- else
- {
- p_vout->p_sys->i_height = atoi( psz_parser );
- p_vout->p_sys->i_x =
- ( p_vout->output.i_width - p_vout->p_sys->i_width ) / 2;
- p_vout->p_sys->i_y =
- ( p_vout->output.i_height - p_vout->p_sys->i_height ) / 2;
- }
- }
- else
- {
- p_vout->p_sys->i_width = atoi( psz_parser );
- p_vout->p_sys->i_height = p_vout->output.i_height;
- p_vout->p_sys->i_x =
- ( p_vout->output.i_width - p_vout->p_sys->i_width ) / 2;
- p_vout->p_sys->i_y =
- ( p_vout->output.i_height - p_vout->p_sys->i_height ) / 2;
- }
- /* Check for validity */
- if( p_vout->p_sys->i_x + p_vout->p_sys->i_width
- > p_vout->output.i_width )
- {
- p_vout->p_sys->i_x = 0;
- if( p_vout->p_sys->i_width > p_vout->output.i_width )
- {
- p_vout->p_sys->i_width = p_vout->output.i_width;
- }
- }
- if( p_vout->p_sys->i_y + p_vout->p_sys->i_height
- > p_vout->output.i_height )
- {
- p_vout->p_sys->i_y = 0;
- if( p_vout->p_sys->i_height > p_vout->output.i_height )
- {
- p_vout->p_sys->i_height = p_vout->output.i_height;
- }
- }
- free( psz_var );
- }
- else
- {
- p_vout->p_sys->i_width = p_vout->output.i_width;
- p_vout->p_sys->i_height = p_vout->output.i_height;
- p_vout->p_sys->i_x = p_vout->p_sys->i_y = 0;
- }
- /* Pheeew. Parsing done. */
- msg_Dbg( p_vout, "cropping at %ix%i+%i+%i, %sautocropping",
- p_vout->p_sys->i_width, p_vout->p_sys->i_height,
- p_vout->p_sys->i_x, p_vout->p_sys->i_y,
- p_vout->p_sys->b_autocrop ? "" : "not " );
- /* Set current output image properties */
- p_vout->p_sys->i_aspect = p_vout->output.i_aspect
- * p_vout->output.i_height / p_vout->p_sys->i_height
- * p_vout->p_sys->i_width / p_vout->output.i_width;
- /* Try to open the real video output */
- p_vout->p_sys->p_vout = vout_Create( p_vout,
- p_vout->p_sys->i_width, p_vout->p_sys->i_height,
- p_vout->render.i_chroma, p_vout->p_sys->i_aspect );
- if( p_vout->p_sys->p_vout == NULL )
- {
- msg_Err( p_vout, "failed to create vout" );
- return VLC_EGENERIC;
- }
- ALLOCATE_DIRECTBUFFERS( VOUT_MAX_PICTURES );
- ADD_CALLBACKS( p_vout->p_sys->p_vout, SendEvents );
- ADD_PARENT_CALLBACKS( SendEventsToChild );
- return VLC_SUCCESS;
- }
- /*****************************************************************************
- * End: terminate Crop video thread output method
- *****************************************************************************/
- static void End( vout_thread_t *p_vout )
- {
- int i_index;
- /* Free the fake output buffers we allocated */
- for( i_index = I_OUTPUTPICTURES ; i_index ; )
- {
- i_index--;
- free( PP_OUTPUTPICTURE[ i_index ]->p_data_orig );
- }
- }
- /*****************************************************************************
- * Destroy: destroy Crop video thread output method
- *****************************************************************************
- * Terminate an output method created by CropCreateOutputMethod
- *****************************************************************************/
- static void Destroy( vlc_object_t *p_this )
- {
- vout_thread_t *p_vout = (vout_thread_t *)p_this;
- if( p_vout->p_sys->p_vout )
- {
- DEL_CALLBACKS( p_vout->p_sys->p_vout, SendEvents );
- vlc_object_detach( p_vout->p_sys->p_vout );
- vout_Destroy( p_vout->p_sys->p_vout );
- }
- DEL_PARENT_CALLBACKS( SendEventsToChild );
- free( p_vout->p_sys );
- }
- /*****************************************************************************
- * Manage: handle Crop events
- *****************************************************************************
- * This function should be called regularly by video output thread. It manages
- * console events. It returns a non null value on error.
- *****************************************************************************/
- static int Manage( vout_thread_t *p_vout )
- {
- if( !p_vout->p_sys->b_changed )
- {
- return VLC_SUCCESS;
- }
- vout_Destroy( p_vout->p_sys->p_vout );
- p_vout->p_sys->p_vout = vout_Create( p_vout,
- p_vout->p_sys->i_width, p_vout->p_sys->i_height,
- p_vout->render.i_chroma, p_vout->p_sys->i_aspect );
- if( p_vout->p_sys->p_vout == NULL )
- {
- msg_Err( p_vout, "failed to create vout" );
- return VLC_EGENERIC;
- }
- p_vout->p_sys->b_changed = VLC_FALSE;
- p_vout->p_sys->i_lastchange = 0;
- return VLC_SUCCESS;
- }
- /*****************************************************************************
- * Render: display previously rendered output
- *****************************************************************************
- * This function sends the currently rendered image to Crop image, waits
- * until it is displayed and switches the two rendering buffers, preparing next
- * frame.
- *****************************************************************************/
- static void Render( vout_thread_t *p_vout, picture_t *p_pic )
- {
- picture_t *p_outpic = NULL;
- int i_plane;
- if( p_vout->p_sys->b_changed )
- {
- return;
- }
- while( ( p_outpic =
- vout_CreatePicture( p_vout->p_sys->p_vout, 0, 0, 0 )
- ) == NULL )
- {
- if( p_vout->b_die || p_vout->b_error )
- {
- vout_DestroyPicture( p_vout->p_sys->p_vout, p_outpic );
- return;
- }
- msleep( VOUT_OUTMEM_SLEEP );
- }
- vout_DatePicture( p_vout->p_sys->p_vout, p_outpic, p_pic->date );
- vout_LinkPicture( p_vout->p_sys->p_vout, p_outpic );
- for( i_plane = 0 ; i_plane < p_pic->i_planes ; i_plane++ )
- {
- uint8_t *p_in, *p_out, *p_out_end;
- int i_in_pitch = p_pic->p[i_plane].i_pitch;
- const int i_out_pitch = p_outpic->p[i_plane].i_pitch;
- const int i_copy_pitch = p_outpic->p[i_plane].i_visible_pitch;
- p_in = p_pic->p[i_plane].p_pixels
- /* Skip the right amount of lines */
- + i_in_pitch * ( p_pic->p[i_plane].i_visible_lines *
- p_vout->p_sys->i_y / p_vout->output.i_height )
- /* Skip the right amount of columns */
- + i_in_pitch * p_vout->p_sys->i_x / p_vout->output.i_width;
- p_out = p_outpic->p[i_plane].p_pixels;
- p_out_end = p_out + i_out_pitch * p_outpic->p[i_plane].i_visible_lines;
- while( p_out < p_out_end )
- {
- p_vout->p_vlc->pf_memcpy( p_out, p_in, i_copy_pitch );
- p_in += i_in_pitch;
- p_out += i_out_pitch;
- }
- }
- vout_UnlinkPicture( p_vout->p_sys->p_vout, p_outpic );
- vout_DisplayPicture( p_vout->p_sys->p_vout, p_outpic );
- /* The source image may still be in the cache ... parse it! */
- if( p_vout->p_sys->b_autocrop )
- {
- UpdateStats( p_vout, p_pic );
- }
- }
- static void UpdateStats( vout_thread_t *p_vout, picture_t *p_pic )
- {
- uint8_t *p_in = p_pic->p[0].p_pixels;
- int i_pitch = p_pic->p[0].i_pitch;
- int i_visible_pitch = p_pic->p[0].i_visible_pitch;
- int i_lines = p_pic->p[0].i_visible_lines;
- int i_firstwhite = -1, i_lastwhite = -1, i;
- /* Determine where black borders are */
- switch( p_vout->output.i_chroma )
- {
- case VLC_FOURCC('I','4','2','0'):
- /* XXX: Do not laugh ! I know this is very naive. But it's just a
- * proof of concept code snippet... */
- for( i = i_lines ; i-- ; )
- {
- const int i_col = i * i_pitch / i_lines;
- if( p_in[i_col/2] > 40
- && p_in[i_visible_pitch/2] > 40
- && p_in[i_visible_pitch/2 + i_col/2] > 40 )
- {
- if( i_lastwhite == -1 )
- {
- i_lastwhite = i;
- }
- i_firstwhite = i;
- }
- p_in += i_pitch;
- }
- break;
- default:
- break;
- }
- /* Decide whether it's worth changing the size */
- if( i_lastwhite == -1 )
- {
- p_vout->p_sys->i_lastchange = 0;
- return;
- }
- if( (unsigned int)(i_lastwhite - i_firstwhite)
- < p_vout->p_sys->i_height / 2 )
- {
- p_vout->p_sys->i_lastchange = 0;
- return;
- }
- if( (unsigned int)(i_lastwhite - i_firstwhite)
- < p_vout->p_sys->i_height + 16
- && (unsigned int)(i_lastwhite - i_firstwhite + 16)
- > p_vout->p_sys->i_height )
- {
- p_vout->p_sys->i_lastchange = 0;
- return;
- }
- /* We need at least 25 images to make up our mind */
- p_vout->p_sys->i_lastchange++;
- if( p_vout->p_sys->i_lastchange < 25 )
- {
- return;
- }
- /* Tune a few values */
- if( i_firstwhite & 1 )
- {
- i_firstwhite--;
- }
- if( !(i_lastwhite & 1) )
- {
- i_lastwhite++;
- }
- /* Change size */
- p_vout->p_sys->i_y = i_firstwhite;
- p_vout->p_sys->i_height = i_lastwhite - i_firstwhite + 1;
- p_vout->p_sys->i_aspect = p_vout->output.i_aspect
- * p_vout->output.i_height / p_vout->p_sys->i_height
- * p_vout->p_sys->i_width / p_vout->output.i_width;
- p_vout->p_sys->b_changed = VLC_TRUE;
- }
- /*****************************************************************************
- * SendEvents: forward mouse and keyboard events to the parent p_vout
- *****************************************************************************/
- static int SendEvents( vlc_object_t *p_this, char const *psz_var,
- vlc_value_t oldval, vlc_value_t newval, void *_p_vout )
- {
- vout_thread_t *p_vout = (vout_thread_t *)_p_vout;
- vlc_value_t sentval = newval;
- /* Translate the mouse coordinates */
- if( !strcmp( psz_var, "mouse-x" ) )
- {
- sentval.i_int += p_vout->p_sys->i_x;
- }
- else if( !strcmp( psz_var, "mouse-y" ) )
- {
- sentval.i_int += p_vout->p_sys->i_y;
- }
- var_Set( p_vout, psz_var, sentval );
- return VLC_SUCCESS;
- }
- /*****************************************************************************
- * SendEventsToChild: forward events to the child/children vout
- *****************************************************************************/
- static int SendEventsToChild( vlc_object_t *p_this, char const *psz_var,
- vlc_value_t oldval, vlc_value_t newval, void *p_data )
- {
- vout_thread_t *p_vout = (vout_thread_t *)p_this;
- var_Set( p_vout->p_sys->p_vout, psz_var, newval );
- return VLC_SUCCESS;
- }