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

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

#include "img_format.h"
#include "mp_image.h"
#include "vf.h"

#include "../libvo/video_out.h"
#include "../libvo/fastmemcpy.h"
#include "../postproc/rgb2rgb.h"

struct vf_priv_s {
	unsigned char *buf;
	int brightness;
	int contrast;
};

#ifdef HAVE_MMX
static void process_MMX(unsigned char *dest, int dstride, unsigned char *src, int sstride,
		    int w, int h, int brightness, int contrast)
{
	int i;
	int pel;
	int dstep = dstride-w;
	int sstep = sstride-w;
	short brvec[4];
	short contvec[4];

	contrast = ((contrast+100)*256*16)/100;
	brightness = ((brightness+100)*511)/200-128 - contrast/32;

	brvec[0] = brvec[1] = brvec[2] = brvec[3] = brightness;
	contvec[0] = contvec[1] = contvec[2] = contvec[3] = contrast;
		
	while (h--) {
		asm volatile (
			"movq (%5), %%mm3 \n\t"
			"movq (%6), %%mm4 \n\t"
			"pxor %%mm0, %%mm0 \n\t"
			"movl %4, %%eax\n\t"
                       ".balign 16 \n\t"
			"1: \n\t"
			"movq (%0), %%mm1 \n\t"
			"movq (%0), %%mm2 \n\t"
			"punpcklbw %%mm0, %%mm1 \n\t"
			"punpckhbw %%mm0, %%mm2 \n\t"
			"psllw $4, %%mm1 \n\t"
			"psllw $4, %%mm2 \n\t"
			"pmulhw %%mm4, %%mm1 \n\t"
			"pmulhw %%mm4, %%mm2 \n\t"
			"paddw %%mm3, %%mm1 \n\t"
			"paddw %%mm3, %%mm2 \n\t"
			"packuswb %%mm2, %%mm1 \n\t"
			"addl $8, %0 \n\t"
			"movq %%mm1, (%1) \n\t"
			"addl $8, %1 \n\t"
			"decl %%eax \n\t"
			"jnz 1b \n\t"
			: "=r" (src), "=r" (dest)
			: "0" (src), "1" (dest), "r" (w>>3), "r" (brvec), "r" (contvec)
			: "%eax"
		);

		for (i = w&7; i; i--)
		{
			pel = ((*src++* contrast)>>12) + brightness;
			if(pel&768) pel = (-pel)>>31;
			*dest++ = pel;
		}

		src += sstep;
		dest += dstep;
	}
	asm volatile ( "emms \n\t" ::: "memory" );
}
#endif

static void process_C(unsigned char *dest, int dstride, unsigned char *src, int sstride,
		    int w, int h, int brightness, int contrast)
{
	int i;
	int pel;
	int dstep = dstride-w;
	int sstep = sstride-w;

	contrast = ((contrast+100)*256*256)/100;
	brightness = ((brightness+100)*511)/200-128 - contrast/512;

	while (h--) {
		for (i = w; i; i--)
		{
			pel = ((*src++* contrast)>>16) + brightness;
			if(pel&768) pel = (-pel)>>31;
			*dest++ = pel;
		}
		src += sstep;
		dest += dstep;
	}
}

static void (*process)(unsigned char *dest, int dstride, unsigned char *src, int sstride,
		       int w, int h, int brightness, int contrast);

/* FIXME: add packed yuv version of process */

static int put_image(struct vf_instance_s* vf, mp_image_t *mpi)
{
	mp_image_t *dmpi;

	dmpi=vf_get_image(vf->next, mpi->imgfmt,
			  MP_IMGTYPE_EXPORT, 0,
			  mpi->w, mpi->h);
	
	dmpi->stride[0] = mpi->stride[0];
	dmpi->planes[1] = mpi->planes[1];
	dmpi->planes[2] = mpi->planes[2];
	dmpi->stride[1] = mpi->stride[1];
	dmpi->stride[2] = mpi->stride[2];

	if (!vf->priv->buf) vf->priv->buf = malloc(mpi->stride[0]*mpi->h);
	
	if ((vf->priv->brightness == 0) && (vf->priv->contrast == 0))
		dmpi->planes[0] = mpi->planes[0];
	else {
		dmpi->planes[0] = vf->priv->buf;
		process(dmpi->planes[0], dmpi->stride[0],
			mpi->planes[0], mpi->stride[0],
			mpi->w, mpi->h, vf->priv->brightness,
			vf->priv->contrast);
	}

	return vf_next_put_image(vf,dmpi);
}

static int control(struct vf_instance_s* vf, int request, void* data)
{
	vf_equalizer_t *eq;

	switch (request) {
	case VFCTRL_SET_EQUALIZER:
		eq = data;
		if (!strcmp(eq->item,"brightness")) {
			vf->priv->brightness = eq->value;
			return CONTROL_TRUE;
		}
		else if (!strcmp(eq->item,"contrast")) {
			vf->priv->contrast = eq->value;
			return CONTROL_TRUE;
		}
		break;
	case VFCTRL_GET_EQUALIZER:
		eq = data;
		if (!strcmp(eq->item,"brightness")) {
			eq->value = vf->priv->brightness;
			return CONTROL_TRUE;
		}
		else if (!strcmp(eq->item,"contrast")) {
			eq->value = vf->priv->contrast;
			return CONTROL_TRUE;
		}
		break;
	}
	return vf_next_control(vf, request, data);
}

static int query_format(struct vf_instance_s* vf, unsigned int fmt)
{
	switch (fmt) {
	case IMGFMT_YVU9:
	case IMGFMT_IF09:
	case IMGFMT_YV12:
	case IMGFMT_I420:
	case IMGFMT_IYUV:
	case IMGFMT_CLPL:
	case IMGFMT_Y800:
	case IMGFMT_Y8:
	case IMGFMT_NV12:
	case IMGFMT_444P:
	case IMGFMT_422P:
	case IMGFMT_411P:
		return vf_next_query_format(vf, fmt);
	}
	return 0;
}

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

static int open(vf_instance_t *vf, char* args)
{
	vf->control=control;
	vf->query_format=query_format;
	vf->put_image=put_image;
	vf->uninit=uninit;
	
	vf->priv = malloc(sizeof(struct vf_priv_s));
	memset(vf->priv, 0, sizeof(struct vf_priv_s));
	if (args) sscanf(args, "%d:%d", &vf->priv->brightness, &vf->priv->contrast);

	process = process_C;
#ifdef HAVE_MMX
	if(gCpuCaps.hasMMX) process = process_MMX;
#endif
	
	return 1;
}

vf_info_t vf_info_eq = {
	"soft video equalizer",
	"eq",
	"Richard Felker",
	"",
	open
};

