/*
 *
 * GStreamer
 * Copyright (C) 2004 Billy Biggs <vektor@dumbterm.net>
 * Copyright (c) 2001, 2002, 2003 Fabrice Bellard.
 * Copyright (C) 2008 Sebastian Dröge <slomo@collabora.co.uk>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library 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
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */

/*
 * This file contains code from ffmpeg, see http://ffmpeg.org/ (LGPL)
 * and modifications by Billy Biggs.
 *
 * Relicensed for GStreamer from GPL to LGPL with permit from Billy Biggs.
 * See: http://bugzilla.gnome.org/show_bug.cgi?id=163578
 */

#ifdef HAVE_CONFIG_H
# include "config.h"
#endif

#include "_stdint.h"
#include "gstdeinterlace.h"
#include <string.h>

#define GST_TYPE_DEINTERLACE_METHOD_VFIR	(gst_deinterlace_method_vfir_get_type ())
#define GST_IS_DEINTERLACE_METHOD_VFIR(obj)		(G_TYPE_CHECK_INSTANCE_TYPE ((obj), GST_TYPE_DEINTERLACE_METHOD_VFIR))
#define GST_IS_DEINTERLACE_METHOD_VFIR_CLASS(klass)	(G_TYPE_CHECK_CLASS_TYPE ((klass), GST_TYPE_DEINTERLACE_METHOD_VFIR))
#define GST_DEINTERLACE_METHOD_VFIR_GET_CLASS(obj)	(G_TYPE_INSTANCE_GET_CLASS ((obj), GST_TYPE_DEINTERLACE_METHOD_VFIR, GstDeinterlaceMethodVFIRClass))
#define GST_DEINTERLACE_METHOD_VFIR(obj)		(G_TYPE_CHECK_INSTANCE_CAST ((obj), GST_TYPE_DEINTERLACE_METHOD_VFIR, GstDeinterlaceMethodVFIR))
#define GST_DEINTERLACE_METHOD_VFIR_CLASS(klass)	(G_TYPE_CHECK_CLASS_CAST ((klass), GST_TYPE_DEINTERLACE_METHOD_VFIR, GstDeinterlaceMethodVFIRClass))
#define GST_DEINTERLACE_METHOD_VFIR_CAST(obj)	((GstDeinterlaceMethodVFIR*)(obj))

GType gst_deinterlace_method_vfir_get_type (void);

typedef GstDeinterlaceSimpleMethod GstDeinterlaceMethodVFIR;

typedef GstDeinterlaceSimpleMethodClass GstDeinterlaceMethodVFIRClass;

/*
 * The MPEG2 spec uses a slightly harsher filter, they specify
 * [-1 8 2 8 -1].  ffmpeg uses a similar filter but with more of
 * a tendancy to blur than to use the local information.  The
 * filter taps here are: [-1 4 2 4 -1].
 */

/**
  * C implementation.
  */
static inline void
deinterlace_line_c (GstDeinterlaceMethod * self, GstDeinterlace * parent,
    guint8 * dst, GstDeinterlaceScanlineData * scanlines, gint width)
{
  gint sum;
  guint8 *lum_m4 = scanlines->tt1;
  guint8 *lum_m3 = scanlines->t0;
  guint8 *lum_m2 = scanlines->m1;
  guint8 *lum_m1 = scanlines->b0;
  guint8 *lum = scanlines->bb1;
  gint size = width * 2;

  for (; size >= 0; size--) {
    sum = -lum_m4[0];
    sum += lum_m3[0] << 2;
    sum += lum_m2[0] << 1;
    sum += lum_m1[0] << 2;
    sum += -lum[0];
    dst[0] = (sum + 4) >> 3;    // This needs to be clipped at 0 and 255: cm[(sum + 4) >> 3];
    lum_m4++;
    lum_m3++;
    lum_m2++;
    lum_m1++;
    lum++;
    dst++;
  }
}

#ifdef BUILD_X86_ASM
#include "mmx.h"
static void
deinterlace_line_mmx (GstDeinterlaceMethod * self, GstDeinterlace * parent,
    guint8 * dst, GstDeinterlaceScanlineData * scanlines, gint width)
{
  mmx_t rounder;
  guint8 *lum_m4 = scanlines->tt1;
  guint8 *lum_m3 = scanlines->t0;
  guint8 *lum_m2 = scanlines->m1;
  guint8 *lum_m1 = scanlines->b0;
  guint8 *lum = scanlines->bb1;

  rounder.uw[0] = 4;
  rounder.uw[1] = 4;
  rounder.uw[2] = 4;
  rounder.uw[3] = 4;
  pxor_r2r (mm7, mm7);
  movq_m2r (rounder, mm6);

  for (; width > 1; width -= 2) {
    movd_m2r (*lum_m4, mm0);
    movd_m2r (*lum_m3, mm1);
    movd_m2r (*lum_m2, mm2);
    movd_m2r (*lum_m1, mm3);
    movd_m2r (*lum, mm4);
    punpcklbw_r2r (mm7, mm0);
    punpcklbw_r2r (mm7, mm1);
    punpcklbw_r2r (mm7, mm2);
    punpcklbw_r2r (mm7, mm3);
    punpcklbw_r2r (mm7, mm4);
    paddw_r2r (mm3, mm1);
    psllw_i2r (1, mm2);
    paddw_r2r (mm4, mm0);
    psllw_i2r (2, mm1);         // 2
    paddw_r2r (mm6, mm2);
    paddw_r2r (mm2, mm1);
    psubusw_r2r (mm0, mm1);
    psrlw_i2r (3, mm1);         // 3
    packuswb_r2r (mm7, mm1);
    movd_r2m (mm1, *dst);
    lum_m4 += 4;
    lum_m3 += 4;
    lum_m2 += 4;
    lum_m1 += 4;
    lum += 4;
    dst += 4;
  }
  emms ();

  /* Handle odd widths */
  if (width > 0) {
    scanlines->tt1 = lum_m4;
    scanlines->t0 = lum_m3;
    scanlines->m1 = lum_m2;
    scanlines->b0 = lum_m1;
    scanlines->bb1 = lum;

    deinterlace_line_c (self, parent, dst, scanlines, width);
  }
}
#endif

G_DEFINE_TYPE (GstDeinterlaceMethodVFIR, gst_deinterlace_method_vfir,
    GST_TYPE_DEINTERLACE_SIMPLE_METHOD);

static void
gst_deinterlace_method_vfir_class_init (GstDeinterlaceMethodVFIRClass * klass)
{
  GstDeinterlaceMethodClass *dim_class = (GstDeinterlaceMethodClass *) klass;
  GstDeinterlaceSimpleMethodClass *dism_class =
      (GstDeinterlaceSimpleMethodClass *) klass;
#ifdef BUILD_X86_ASM
  guint cpu_flags = oil_cpu_get_flags ();
#endif

  dim_class->fields_required = 2;
  dim_class->name = "Blur Vertical";
  dim_class->nick = "vfir";
  dim_class->latency = 0;

#ifdef BUILD_X86_ASM
  if (cpu_flags & OIL_IMPL_FLAG_MMX) {
    dism_class->interpolate_scanline = deinterlace_line_mmx;
  } else {
    dism_class->interpolate_scanline = deinterlace_line_c;
  }
#else
  dism_class->interpolate_scanline = deinterlace_line_c;
#endif
}

static void
gst_deinterlace_method_vfir_init (GstDeinterlaceMethodVFIR * self)
{
}