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/**
* @file filter_skip.c Skip all listed frames
*
* Copyright (C) Thomas Oestreich - June 2001,
* Thomas Wehrspann - January 2005
*
* This file is part of transcode, a video stream processing tool
*
* transcode 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, or (at your option)
* any later version.
*
* transcode 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 GNU Make; see the file COPYING. If not, write to
* the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
*
*/
/*
* ChangeLog:
* v0.0.1 (2001-11-27)
*
* v0.2 (2005-01-05) Thomas Wehrspann
* -Rewritten, based on filter_cut
* -Documentation added
* -New help function
* -optstr_filter_desc now returns
* the right capability flags
*/
#define MOD_NAME "filter_skip.so"
#define MOD_VERSION "v0.2 (2005-01-05)"
#define MOD_CAP "skip all listed frames"
#define MOD_AUTHOR "Thomas Oestreich, Thomas Wehrspann"
#include "transcode.h"
#include "filter.h"
#include "libtc/libtc.h"
#include "libtc/optstr.h"
#include "libtc/framecode.h"
/**
* Help text.
* This function prints out a small description of this filter and
* the command-line options when the "help" parameter is given
*********************************************************/
static void help_optstr(void)
{
tc_log_info (MOD_NAME, "(%s) help\n"
"* Overview\n"
" This filter skips all listed frames.\n"
"\n"
"* Options\n"
" 'help' Prints out this help text\n"
" 'start-end/step [...]' List of frame ranges to skip (start-end/step) []\n"
, MOD_CAP);
}
/**
* Main function of a filter.
* This is the single function interface to transcode. This is the only function needed for a filter plugin.
* @param ptr frame accounting structure
* @param options command-line options of the filter
*
* @return 0, if everything went OK.
*********************************************************/
int tc_filter(frame_list_t *ptr_, char *options)
{
vframe_list_t *ptr = (vframe_list_t *)ptr_;
static struct fc_time *list;
static double avoffset=1.0;
char separator[] = " ";
vob_t *vob=NULL;
if(ptr->tag & TC_FILTER_GET_CONFIG) {
optstr_filter_desc (options, MOD_NAME, MOD_CAP, MOD_VERSION, MOD_AUTHOR, "VARY4E", "1");
optstr_param (options, "start-end/step [...]", "Skip frames", "%s", "");
return 0;
}
//----------------------------------
//
// filter init
//
//----------------------------------
if(ptr->tag & TC_FILTER_INIT) {
if((vob = tc_get_vob())==NULL) return(-1);
// filter init ok.
if(verbose) tc_log_info(MOD_NAME, "%s %s", MOD_VERSION, MOD_CAP);
if(verbose & TC_DEBUG) tc_log_info(MOD_NAME, "options=%s", options);
if(options == NULL) return(0);
// Parameter parsing
if(options == NULL) return(0);
else if (optstr_lookup (options, "help")) {
help_optstr();
return (0);
} else {
if( parse_fc_time_string( options, vob->fps, separator, verbose, &list ) == -1 ) {
help_optstr();
return (-1);
}
}
avoffset = vob->fps/vob->ex_fps;
return(0);
}
//----------------------------------
//
// filter close
//
//----------------------------------
if(ptr->tag & TC_FILTER_CLOSE) {
return(0);
}
//----------------------------------
//
// filter frame routine
//
//----------------------------------
// tag variable indicates, if we are called before
// transcodes internal video/audio frame processing routines
// or after and determines video/audio context
if((ptr->tag & TC_PRE_S_PROCESS) && (ptr->tag & TC_VIDEO)) {
// fc_frame_in_time returns the step frequency
int ret = fc_frame_in_time(list, ptr->id);
if ((ret && !(ptr->id%ret)))
ptr->attributes |= TC_FRAME_IS_SKIPPED;
} else if ((ptr->tag & TC_PRE_S_PROCESS) && (ptr->tag & TC_AUDIO)){
int ret;
int tmp_id;
tmp_id = (int)((double)ptr->id*avoffset);
ret = fc_frame_in_time(list, tmp_id);
if ((ret && !(tmp_id%ret)))
ptr->attributes |= TC_FRAME_IS_SKIPPED;
}
return(0);
}
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