/*
    Original AVISynth Filter Copyright (C) 2003 Donald A. Graft
    Adapted to MPlayer by Tobias Diedrich

    This program 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.

    This program 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 this program; if not, write to the Free Software
    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <inttypes.h>
#include <math.h>

#include "../config.h"
#include "../mp_msg.h"

#ifdef HAVE_MALLOC_H
#include <malloc.h>
#endif

#include "img_format.h"
#include "mp_image.h"
#include "vf.h"
#include "../libvo/fastmemcpy.h"

//===========================================================================//

struct vf_priv_s {
	int	frame;
	int	map;
	int	order;
	int	thresh;
	int	sharp;
	int	twoway;
};


/***************************************************************************/


static int config(struct vf_instance_s* vf,
        int width, int height, int d_width, int d_height,
	unsigned int flags, unsigned int outfmt){

	return vf_next_config(vf,width,height,d_width,d_height,flags,outfmt);
}


static void uninit(struct vf_instance_s* vf)
{
	free(vf->priv);
}

static inline int IsRGB(mp_image_t *mpi)
{
	return mpi->imgfmt == IMGFMT_RGB;
}

static inline int IsYUY2(mp_image_t *mpi)
{
	return mpi->imgfmt == IMGFMT_YUY2;
}

#define PLANAR_Y 0
#define PLANAR_U 1
#define PLANAR_V 2

static int put_image(struct vf_instance_s* vf, mp_image_t *mpi){
	int cw= mpi->w >> mpi->chroma_x_shift;
	int ch= mpi->h >> mpi->chroma_y_shift;
        int W = mpi->w, H = mpi->h;
	const unsigned char *prvp, *prvpp, *prvpn, *prvpnn, *prvppp, *prvp4p, *prvp4n;
	const unsigned char *srcp_saved;
	const unsigned char *srcp, *srcpp, *srcpn, *srcpnn, *srcppp, *srcp3p, *srcp3n, *srcp4p, *srcp4n;
	unsigned char *dstp, *dstp_saved;
	int src_pitch;
	int psrc_pitch;
	int dst_pitch;
	int x, y, z;
	int n = vf->priv->frame++;
	int val, hi, lo, w, h;
	double valf;
	unsigned int hint;
	int plane;
	int threshold = vf->priv->thresh;
	int order = vf->priv->order;
	int map = vf->priv->map;
	int sharp = vf->priv->sharp;
	int twoway = vf->priv->twoway;

	mp_image_t *dmpi=vf_get_image(vf->next,mpi->imgfmt,
		MP_IMGTYPE_IP, MP_IMGFLAG_ACCEPT_STRIDE,
		mpi->w,mpi->h);
	mp_image_t *pmpi=vf_get_image(vf->next,mpi->imgfmt,
		MP_IMGTYPE_TEMP, MP_IMGFLAG_ACCEPT_STRIDE,
		mpi->w,mpi->h);
	if(!dmpi) return 0;

	for (z=0; z<mpi->num_planes; z++) {
		if (z == 0) plane = PLANAR_Y;
		else if (z == 1) plane = PLANAR_U;
		else plane = PLANAR_V;

		h = plane == PLANAR_Y ? H : ch;
		w = plane == PLANAR_Y ? W : cw;

		srcp = srcp_saved = mpi->planes[z];
		src_pitch = mpi->stride[z];
		psrc_pitch = pmpi->stride[z];
		dstp = dstp_saved = dmpi->planes[z];
		dst_pitch = dmpi->stride[z];
		srcp = srcp_saved + (1-order) * src_pitch;
		dstp = dstp_saved + (1-order) * dst_pitch;

		for (y=0; y<h; y+=2) {
			memcpy(dstp, srcp, w);
			srcp += 2*src_pitch;
			dstp += 2*dst_pitch;
		}

		// Copy through the lines that will be missed below.
		memcpy(dstp_saved + order*dst_pitch, srcp_saved + (1-order)*src_pitch, w);
		memcpy(dstp_saved + (2+order)*dst_pitch, srcp_saved + (3-order)*src_pitch, w);
		memcpy(dstp_saved + (h-2+order)*dst_pitch, srcp_saved + (h-1-order)*src_pitch, w);
		memcpy(dstp_saved + (h-4+order)*dst_pitch, srcp_saved + (h-3-order)*src_pitch, w);
		/* For the other field choose adaptively between using the previous field
		   or the interpolant from the current field. */

		prvp = pmpi->planes[z] + 5*psrc_pitch - (1-order)*psrc_pitch;
		prvpp = prvp - psrc_pitch;
		prvppp = prvp - 2*psrc_pitch;
		prvp4p = prvp - 4*psrc_pitch;
		prvpn = prvp + psrc_pitch;
		prvpnn = prvp + 2*psrc_pitch;
		prvp4n = prvp + 4*psrc_pitch;
		srcp = srcp_saved + 5*src_pitch - (1-order)*src_pitch;
		srcpp = srcp - src_pitch;
		srcppp = srcp - 2*src_pitch;
		srcp3p = srcp - 3*src_pitch;
		srcp4p = srcp - 4*src_pitch;
		srcpn = srcp + src_pitch;
		srcpnn = srcp + 2*src_pitch;
		srcp3n = srcp + 3*src_pitch;
		srcp4n = srcp + 4*src_pitch;
		dstp =  dstp_saved  + 5*dst_pitch - (1-order)*dst_pitch;
		for (y = 5 - (1-order); y <= h - 5 - (1-order); y+=2)
		{
			for (x = 0; x < w; x++)
			{
				if ((threshold == 0) || (n == 0) ||
					(abs((int)prvp[x] - (int)srcp[x]) > threshold) ||
					(abs((int)prvpp[x] - (int)srcpp[x]) > threshold) ||
					(abs((int)prvpn[x] - (int)srcpn[x]) > threshold))
				{
					if (map == 1)
					{
						int g = x & ~3;
						if (IsRGB(mpi) == 1)
						{
							dstp[g++] = 255;
							dstp[g++] = 255;
							dstp[g++] = 255;
							dstp[g] = 255;
							x = g;
						}
						else if (IsYUY2(mpi) == 1)
						{
							dstp[g++] = 235;
							dstp[g++] = 128;
							dstp[g++] = 235;
							dstp[g] = 128;
							x = g;
						}
						else
						{
							if (plane == PLANAR_Y) dstp[x] = 235;
							else dstp[x] = 128;
						}
					}
					else
					{
						if (IsRGB(mpi))
						{
							hi = 255;
							lo = 0;
						}
						else if (IsYUY2(mpi))
						{
							hi = (x & 1) ? 240 : 235;
							lo = 16;
						}
						else
						{
							hi = (plane == PLANAR_Y) ? 235 : 240;
							lo = 16;
						}

						if (sharp == 1)
						{
							if (twoway == 1)
								valf = + 0.526*((int)srcpp[x] + (int)srcpn[x])
								   + 0.170*((int)srcp[x] + (int)prvp[x])
								   - 0.116*((int)srcppp[x] + (int)srcpnn[x] + (int)prvppp[x] + (int)prvpnn[x])
					 			   - 0.026*((int)srcp3p[x] + (int)srcp3n[x])
								   + 0.031*((int)srcp4p[x] + (int)srcp4n[x] + (int)prvp4p[x] + (int)prvp4n[x]);
							else
								valf = + 0.526*((int)srcpp[x] + (int)srcpn[x])
								   + 0.170*((int)prvp[x])
								   - 0.116*((int)prvppp[x] + (int)prvpnn[x])
					 			   - 0.026*((int)srcp3p[x] + (int)srcp3n[x])
								   + 0.031*((int)prvp4p[x] + (int)prvp4p[x]);
							if (valf > hi) valf = hi;
							else if (valf < lo) valf = lo;
							dstp[x] = (int) valf;
						}
						else
						{
							if (twoway == 1)
								val = (8*((int)srcpp[x] + (int)srcpn[x]) + 2*((int)srcp[x] + (int)prvp[x]) -
									(int)(srcppp[x]) - (int)(srcpnn[x]) -
									(int)(prvppp[x]) - (int)(prvpnn[x])) >> 4;
							else
								val = (8*((int)srcpp[x] + (int)srcpn[x]) + 2*((int)prvp[x]) -
									(int)(prvppp[x]) - (int)(prvpnn[x])) >> 4;
							if (val > hi) val = hi;
							else if (val < lo) val = lo;
							dstp[x] = (int) val;
						}
					}
				}
				else
				{
					dstp[x] = srcp[x];
				}
			}
			prvp  += 2*psrc_pitch;
			prvpp  += 2*psrc_pitch;
			prvppp  += 2*psrc_pitch;
			prvpn  += 2*psrc_pitch;
			prvpnn  += 2*psrc_pitch;
			prvp4p  += 2*psrc_pitch;
			prvp4n  += 2*psrc_pitch;
			srcp  += 2*src_pitch;
			srcpp += 2*src_pitch;
			srcppp += 2*src_pitch;
			srcp3p += 2*src_pitch;
			srcp4p += 2*src_pitch;
			srcpn += 2*src_pitch;
			srcpnn += 2*src_pitch;
			srcp3n += 2*src_pitch;
			srcp4n += 2*src_pitch;
			dstp  += 2*dst_pitch;
		}

		srcp = mpi->planes[z];
		dstp = pmpi->planes[z];
		for (y=0; y<h; y++) {
			memcpy(dstp, srcp, w);
			srcp += src_pitch;
			dstp += psrc_pitch;
		}
	}

	return vf_next_put_image(vf,dmpi);
}

//===========================================================================//

static int query_format(struct vf_instance_s* vf, unsigned int fmt){
        switch(fmt)
	{
	case IMGFMT_YV12:
	case IMGFMT_RGB:
	case IMGFMT_YUY2:
		return vf_next_query_format(vf, fmt);
	}
	return 0;
}

static int open(vf_instance_t *vf, char* args){
        double LumSpac, LumTmp, ChromSpac, ChromTmp;
        double Param1, Param2, Param3;

	vf->config=config;
	vf->put_image=put_image;
        vf->query_format=query_format;
        vf->uninit=uninit;
	vf->priv=malloc(sizeof(struct vf_priv_s));
        memset(vf->priv, 0, sizeof(struct vf_priv_s));

	vf->priv->frame = 0;

	vf->priv->map = 0;
	vf->priv->order = 0;
	vf->priv->thresh = 10;
	vf->priv->sharp = 0;
	vf->priv->twoway = 0;

        if (args)
        {
            sscanf(args, "%d:%d:%d:%d:%d",
		&vf->priv->thresh, &vf->priv->map,
		&vf->priv->order, &vf->priv->sharp,
		&vf->priv->twoway);
        }
	if (vf->priv->order > 1) vf->priv->order = 1;

	return 1;
}

vf_info_t vf_info_kerndeint = {
    "Kernel Deinterlacer",
    "kerndeint",
    "Donald Graft",
    "",
    open,
    NULL
};

//===========================================================================//
