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/*
* filter_aclip.c
*
* Copyright (C) Thomas Oestreich - June 2001
*
* 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.
*
*/
#define MOD_NAME "filter_aclip.so"
#define MOD_VERSION "v0.1.1 (2003-09-04)"
#define MOD_CAP "generate audio clips from source"
#define MOD_AUTHOR "Thomas Oestreich"
#include "transcode.h"
#include "filter.h"
#include "libtc/optstr.h"
#include <math.h>
static uint64_t total=0;
static int level=10, range=25, range_ctr=0, skip_mode=0;
/*-------------------------------------------------
*
* single function interface
*
*-------------------------------------------------*/
static int is_optstr(char *a)
{
if (strchr(a, '=')) return 1;
if (strchr(a, 'h')) return 1;
return 0;
}
int tc_filter(frame_list_t *ptr_, char *options)
{
aframe_list_t *ptr = (aframe_list_t *)ptr_;
int n;
double sum;
short *s;
vob_t *vob=NULL;
if(ptr->tag & TC_FILTER_GET_CONFIG) {
optstr_filter_desc (options, MOD_NAME, MOD_CAP, MOD_VERSION, "Thomas Oestreich", "AE", "1");
optstr_param (options, "level", "The audio must be under this level to be skipped", "%d", "10", "0", "255");
optstr_param (options, "range", "Number of samples over level will be keyframes", "%d", "25", "0", "255");
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_log_info(MOD_NAME, "options=%s", options);
if(options!=NULL) {
if (!is_optstr(options)) {
n=sscanf(options,"%d:%d", &level, &range);
} else {
optstr_get (options, "level", "%d", &level);
optstr_get (options, "range", "%d", &range);
}
}
range_ctr=range;
return(0);
}
//----------------------------------
//
// filter close
//
//----------------------------------
if(ptr->tag & TC_FILTER_CLOSE) {
return(0);
}
//----------------------------------
//
// filter frame routine
//
//----------------------------------
if(verbose & TC_STATS)
tc_log_info(MOD_NAME, "%s/%s %s %s",
vob->mod_path, MOD_NAME, MOD_VERSION, MOD_CAP);
// tag variable indicates, if we are called before
// transcodes internal video/audo frame processing routines
// or after and determines video/audio context
if(ptr->tag & TC_PRE_S_PROCESS && ptr->tag & TC_AUDIO && !(ptr->attributes & TC_FRAME_IS_SKIPPED)) {
total += (uint64_t) ptr->audio_size;
s=(short *) ptr->audio_buf;
sum=0;
for(n=0; n<ptr->audio_size>>1; ++n) {
sum+=(double) ((int)(*s) * (int)(*s));
s++;
}
if(ptr->audio_size>0) sum = sqrt(sum)/(ptr->audio_size>>1);
sum *= 1000;
if(verbose & TC_DEBUG) tc_log_info(MOD_NAME, "frame=%d sum=%f", ptr->id, sum);
if(sum<level) {
if(range_ctr == range) {
ptr->attributes |= TC_FRAME_IS_SKIPPED;
skip_mode=1;
} else ++range_ctr;
} else {
if(skip_mode) ptr->attributes |= TC_FRAME_IS_KEYFRAME;
skip_mode = 0;
range_ctr = 0;
}
}
return(0);
}
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