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/*
* filter_smooth.c
*
* Copyright (C) Chad Page - October 2002
*
* 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_smooth.so"
#define MOD_VERSION "v0.2.3 (2003-03-27)"
#define MOD_CAP "(single-frame) smoothing plugin"
#define MOD_AUTHOR "Chad Page"
#include "transcode.h"
#include "filter.h"
#include "libtc/optstr.h"
/* FIXME: this uses the filter ID as an index--the ID can grow
* arbitrarily large, so this needs to be fixed */
static unsigned char *tbuf[100];
static void smooth_yuv(unsigned char *buf, int width, int height, int maxdiff,
int maxldiff, int maxdist, float level, int instance)
{
int x, y, pu, cpu, cdiff;
int xa, ya, oval, ldiff;
unsigned char *bufcr, *bufcb;
unsigned char *tbufcr, *tbufcb, *ltbuf;
float dist, ratio, nval;
ltbuf = tbuf[instance];
tbufcb = <buf[width * height];
tbufcr = &tbufcb[(width/2) * (height/2)];
ac_memcpy(ltbuf, buf, (width * height) * 3 / 2);
bufcb = &buf[width * height];
bufcr = &bufcb[(width/2) * (height/2)];
/* First pass - horizontal */
for (y = 0; y < (height); y++) {
for (x = 0; x < width; x++) {
pu = ((y * width) / 2) + (x / 2);
nval = ((float)buf[x + (y * width)]);
oval = buf[x + (y * width)];
for (xa = x - maxdist; (xa <= (x + maxdist)) && (xa < width); xa++) {
if (xa < 0) xa = 0;
if (xa == x) xa++;
cpu = ((y * width) / 2) + (xa / 2);
cdiff = abs(tbufcr[pu] - tbufcr[cpu]);
cdiff += abs(tbufcb[pu] - tbufcb[cpu]);
/* If color difference not too great, average the pixel according to distance */
ldiff = abs(ltbuf[xa + (y * width)] - oval);
if ((cdiff < maxdiff) && (ldiff < maxldiff)) {
dist = abs(xa - x);
ratio = level / dist;
nval = nval * (1 - ratio);
nval += ((float)ltbuf[xa + (y * width)]) * ratio;
}
}
buf[x + (y * width)] = (unsigned char)(nval + 0.5);
}
}
/* Second pass - vertical lines */
ac_memcpy(ltbuf, buf, (width * height) * 3 / 2);
for (y = 0; y < (height); y++) {
for (x = 0; x < width; x++) {
pu = ((y * width) / 2) + (x / 2);
nval = ((float)buf[x + (y * width)]);
oval = buf[x + (y * width)];
for (ya = y - maxdist; (ya <= (y + maxdist)) && (ya < height); ya++) {
if (ya < 0) ya = 0;
if (ya == y) ya++;
cpu = ((ya * width) / 2) + (x / 2);
cdiff = abs(tbufcr[pu] - tbufcr[cpu]);
cdiff += abs(tbufcb[pu] - tbufcb[cpu]);
/* If color difference not too great, average the pixel according to distance */
ldiff = abs(ltbuf[x + (ya * width)] - oval);
if ((cdiff < maxdiff) && (ldiff < maxldiff)) {
dist = abs(ya - y);
ratio = level / dist;
nval = nval * (1 - ratio);
nval += ((float)ltbuf[x + (ya * width)]) * ratio;
}
}
buf[x + (y * width)] = (unsigned char)(nval + 0.5);
}
}
}
/*-------------------------------------------------
*
* single function interface
*
*-------------------------------------------------*/
int tc_filter(frame_list_t *ptr_, char *options)
{
vframe_list_t *ptr = (vframe_list_t *)ptr_;
static vob_t *vob=NULL;
/* FIXME: these use the filter ID as an index--the ID can grow
* arbitrarily large, so this needs to be fixed */
static int cdiff[100], ldiff[100], range[100];
static float strength[100];
int instance = ptr->filter_id;
//----------------------------------
//
// filter print configure
//
//----------------------------------
if(ptr->tag & TC_FILTER_GET_CONFIG) {
char buf[32];
optstr_filter_desc (options, MOD_NAME, MOD_CAP, MOD_VERSION, MOD_AUTHOR, "VYEM", "1");
// buf, name, comment, format, val, from, to
tc_snprintf (buf, 32, "%.2f", strength[instance]);
optstr_param (options, "strength", "Blending factor", "%f", buf, "0.0", "0.9");
tc_snprintf (buf, 32, "%d", cdiff[instance]);
optstr_param (options, "cdiff", "Max difference in chroma values", "%d", buf, "0", "16");
tc_snprintf (buf, 32, "%d", ldiff[instance]);
optstr_param (options, "ldiff", "Max difference in luma value", "%d", buf, "0", "16");
tc_snprintf (buf, 32, "%d", range[instance]);
optstr_param (options, "range", "Search Range", "%d", buf, "0", "16");
return 0;
}
//----------------------------------
//
// filter init
//
//----------------------------------
if(ptr->tag & TC_FILTER_INIT) {
if((vob = tc_get_vob())==NULL) return(-1);
// filter init ok.
// set defaults
strength[instance] = 0.25; /* Blending factor. Do not exceed 2 ever */
cdiff[instance] = 6; /* Max difference in UV values */
ldiff[instance] = 8; /* Max difference in Y value */
range[instance] = 4; /* Search range */
if (options != NULL) {
if(verbose) tc_log_info(MOD_NAME, "options=%s", options);
optstr_get (options, "strength", "%f", &strength[instance]);
optstr_get (options, "cdiff", "%d", &cdiff[instance]);
optstr_get (options, "ldiff", "%d", &ldiff[instance]);
optstr_get (options, "range", "%d", &range[instance]);
}
tbuf[instance] = tc_malloc(SIZE_RGB_FRAME);
if (strength[instance]> 0.9) strength[instance] = 0.9;
memset(tbuf[instance], 0, SIZE_RGB_FRAME);
if (vob->im_v_codec == CODEC_RGB) {
if (verbose) tc_log_error(MOD_NAME, "only capable of YUV mode");
return -1;
}
if(verbose) tc_log_info(MOD_NAME, "%s %s #%d", MOD_VERSION, MOD_CAP, ptr->filter_id);
return(0);
}
//----------------------------------
//
// filter close
//
//----------------------------------
if(ptr->tag & TC_FILTER_CLOSE) {
if (tbuf[instance])
free(tbuf[instance]);
tbuf[instance] = NULL;
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 && !(ptr->attributes & TC_FRAME_IS_SKIPPED)) {
if (vob->im_v_codec == CODEC_YUV)
smooth_yuv(ptr->video_buf, ptr->v_width, ptr->v_height, cdiff[instance],
ldiff[instance], range[instance], strength[instance], instance);
}
return(0);
}
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