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/*
* filter_decimate.c
*
* Copyright (C) Thanassis Tsiodras - August 2002
*
* This file is part of transcode, a video stream processing tool
* Based on the excellent work of Donald Graft in Decomb.
*
* 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_decimate.so"
#define MOD_VERSION "v0.4 (2003-04-22)"
#define MOD_CAP "NTSC decimation plugin"
#define MOD_AUTHOR "Thanassis Tsiodras"
#include "transcode.h"
#include "filter.h"
#include "libtc/optstr.h"
static int show_results=0;
/*-------------------------------------------------
*
* single function interface
*
*-------------------------------------------------*/
#define FRBUFSIZ 6
int tc_filter(frame_list_t *ptr_, char *options)
{
vframe_list_t *ptr = (vframe_list_t *)ptr_;
static vob_t *vob = NULL;
static char *lastFrames[FRBUFSIZ];
static int frameIn = 0, frameOut = 0;
static int frameCount = -1, lastFramesOK[FRBUFSIZ];
//----------------------------------
//
// filter init
//
//----------------------------------
if (ptr->tag & TC_FILTER_GET_CONFIG) {
if (options) {
optstr_filter_desc (options, MOD_NAME, MOD_CAP, MOD_VERSION, "Thanassis Tsiodras", "VYO", "1");
optstr_param (options, "verbose", "print verbose information", "", "0");
}
}
if (ptr->tag & TC_FILTER_INIT) {
int i;
if ((vob = tc_get_vob()) == NULL)
return (-1);
if (vob->im_v_codec != CODEC_YUV) {
tc_log_error(MOD_NAME, "Sorry, only YUV input allowed for now");
return (-1);
}
// filter init ok.
if (options != NULL) {
if (optstr_lookup (options, "verbose") != NULL) {
show_results=1;
}
}
if (verbose)
tc_log_info(MOD_NAME, "%s %s", MOD_VERSION, MOD_CAP);
for(i=0; i<FRBUFSIZ; i++) {
lastFrames[i] = tc_malloc(SIZE_RGB_FRAME);
lastFramesOK[i] = 1;
}
return (0);
}
//----------------------------------
//
// filter close
//
//----------------------------------
if (ptr->tag & TC_FILTER_CLOSE) {
int i;
for(i=0; i<FRBUFSIZ; i++)
free(lastFrames[i]);
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_POST_S_PROCESS) && (ptr->tag & TC_VIDEO)) {
// After frame processing, the frames must be deinterlaced.
// For inverse telecine, this has been done by the ivtc filter
// (you must use filter_ivtc before this filter)
// for example :
// -J ivtc,decimate
// or (better) :
// -J ivtc,32detect=force_mode=3,decimate
ac_memcpy( lastFrames[frameIn],
ptr->video_buf,
ptr->v_width*ptr->v_height*3);
if (show_results)
tc_log_info(MOD_NAME, "Inserted frame %d into slot %d ",
frameCount, frameIn);
lastFramesOK[frameIn] = 1;
frameIn = (frameIn+1) % FRBUFSIZ;
frameCount++;
// The first 5 frames are not processed; they are only buffered.
if (frameCount <= 4) {
ptr->attributes |= TC_FRAME_IS_SKIPPED;
} else {
// Having 6 frames in the buffer, we will now output one of them.
// From now on, for each group of 5 frames we will drop 1
// (FPS: 29.97->23.976). In fact, we will drop the frame
// that looks almost exactly like its successor.
if ((frameCount % 5) == 0) {
// First, find which one of the first 5 frames in the group
// looks almost exactly like the frame that follows.
int i, j, diffMin=INT_MAX, indexMin = -1;
for(j=0; j<5; j++) {
int diff = 0;
for(i=0; i<ptr->v_height*ptr->v_width; i+=16)
diff += abs(
lastFrames[(frameOut+j+1)%FRBUFSIZ][i] -
lastFrames[(frameOut+j)%FRBUFSIZ][i]);
if (diff<diffMin) {
diffMin = diff;
indexMin = j;
}
}
// ...and mark it as junk
lastFramesOK[(frameOut+indexMin)%FRBUFSIZ] = 0;
}
if (lastFramesOK[frameOut]) {
ac_memcpy( ptr->video_buf,
lastFrames[frameOut],
ptr->v_width*ptr->v_height*3);
if (show_results)
tc_log_info(MOD_NAME, "giving slot %d", frameOut);
}
else {
ptr->attributes |= TC_FRAME_IS_SKIPPED;
if (show_results)
tc_log_info(MOD_NAME, "droping slot %d", frameOut);
}
// Regardless of the job we periodically do (for each group
// of 5 frames) we must also advance the two indexes.
// The frameIn index is increased at frame insertion.
// Now it is time for the frameOut index.
// Note that both indexes are moving at the same speed,
// so no code for circular queue index-clashing is required.
frameOut = (frameOut+1) % FRBUFSIZ;
}
}
return (0);
}
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