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/*
* filter_32detect.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_32drop.so"
#define MOD_VERSION "v0.4 (2003-02-01)"
#define MOD_CAP "3:2 inverse telecine removal plugin"
#define MOD_AUTHOR "Chad Page"
#include "transcode.h"
#include "filter.h"
#include "libtc/libtc.h"
#include "libtc/optstr.h"
#include <stdint.h>
// basic parameter
static int color_diff_threshold1=50;
static int color_diff_threshold2=100;
static double critical_threshold=0.00005;
/*-------------------------------------------------
*
* single function interface
*
*-------------------------------------------------*/
// static int sq( int d ) { return d * d; } // unused, EMS
static int interlace_test(char *video_buf, int width, int height, int id, int verbose)
{
int j, n, off, block, cc_1, cc_2, cc;
uint16_t s1, s2, s3, s4;
cc_1 = 0;
cc_2 = 0;
block = width;
for(j=0; j<block; ++j) {
off=0;
for(n=0; n<(height-4); n=n+2) {
s1 = (video_buf[off+j ] & 0xff);
s2 = (video_buf[off+j+ block] & 0xff);
s3 = (video_buf[off+j+2*block] & 0xff);
s4 = (video_buf[off+j+3*block] & 0xff);
if((abs(s1 - s3) < color_diff_threshold1) &&
(abs(s1 - s2) > color_diff_threshold2)) ++cc_1;
if((abs(s2 - s4) < color_diff_threshold1) &&
(abs(s2 - s3) > color_diff_threshold2)) ++cc_2;
off +=2*block;
}
}
// compare results
cc = (((double) (cc_1 + cc_2))/(width*height) > critical_threshold) ? 1:0;
return(cc);
}
static void merge_frames(unsigned char *f1, unsigned char *f2, int width, int height, int pw)
{
int i;
char *cbuf1, *cbuf2;
/* In YUV, only merge the Y plane, since CrCb planes can't be discerned
* due to the merger. This lets us also reuse the code for RGB */
for (i = 0; i < height; i += 2) {
ac_memcpy(&f2[i * width * pw], &f1[i * width * pw], width * pw);
}
/* If we're in YUV mode, the previous frame has the correct color data */
if (pw == 1) {
cbuf1 = &f1[height * width];
cbuf2 = &f2[height * width];
ac_memcpy(cbuf2, cbuf1, (height * width / 2));
}
}
int tc_filter(frame_list_t *ptr_, char *options)
{
vframe_list_t *ptr = (vframe_list_t *)ptr_;
static vob_t *vob=NULL;
static char *lastframe, *lastiframe;
static int linum = -1, lfnum = -1, fnum = 0, isint = 0, dcnt = 0, dfnum = 0;
if(ptr->tag & TC_FILTER_GET_CONFIG) {
optstr_filter_desc (options, MOD_NAME, MOD_CAP, MOD_VERSION, "Thomas Oestreich", "VRYE", "1");
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);
lastframe = tc_malloc(SIZE_RGB_FRAME);
lastiframe = tc_malloc(SIZE_RGB_FRAME);
return(0);
}
//----------------------------------
//
// filter close
//
//----------------------------------
if(ptr->tag & TC_FILTER_CLOSE) {
free(lastframe);
free(lastiframe);
return(0);
}
//----------------------------------
//
// filter frame routine
//
//----------------------------------
// 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_M_PROCESS) && (ptr->tag & TC_VIDEO)) {
if(vob->im_v_codec==CODEC_RGB) {
isint = interlace_test(ptr->video_buf, 3*ptr->v_width, ptr->v_height, ptr->id, 1);
} else {
isint = interlace_test(ptr->video_buf, ptr->v_width, ptr->v_height, ptr->id, 1);
}
//tc_log_msg(MOD_NAME, "%d %d", fnum, dcnt);
if (isint) {
linum = fnum;
/* If this is the second interlaced frame in a row, do a copy of the
* bottom field of the previous frame.
*/
if ((fnum - lfnum) == 2) {
merge_frames(lastiframe, ptr->video_buf, ptr->v_width, ptr->v_height, ((vob->im_v_codec == CODEC_RGB) ? 3:1) );
} else {
ac_memcpy(lastiframe, ptr->video_buf, ptr->video_size);
/* The use of the drop counter ensures syncronization even with
* video-based sources. */
if (dcnt < 8) {
ptr->attributes |= TC_FRAME_IS_SKIPPED;
dcnt += 5;
dfnum++;
} else {
/* If we'd lose sync by dropping, copy the last frame in.
* If there are more than 3 interlaced frames in a row, it's
* probably video and we don't want to copy the last frame over */
if (((fnum - lfnum) < 3) && fnum)
ac_memcpy(ptr->video_buf, lastframe, ptr->video_size);
}
}
} else {
ac_memcpy(lastframe, ptr->video_buf, ptr->video_size);
lfnum = fnum;
}
/* If we're dealing with a non-interlaced source, or close to it, it won't
* drop enough interlaced frames, so drop here to keep sync */
if (dcnt <= -5) {
ptr->attributes |= TC_FRAME_IS_SKIPPED;
dcnt += 5;
dfnum++;
}
fnum++;
dcnt--;
}
return(0);
}
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