gstreamer/gst/videobox/gstvideobox.c

/* GStreamer
 * Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
 * Copyright (C) <2010> Sebastian Dröge <sebastian.droege@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.
 */
/**
 * SECTION:element-videobox
 * @see_also: #GstVideoCrop
 *
 * This plugin crops or enlarges the image. It takes 4 values as input, a
 * top, bottom, left and right offset. Positive values will crop that much
 * pixels from the respective border of the image, negative values will add
 * that much pixels. When pixels are added, you can specify their color. 
 * Some predefined colors are usable with an enum property.
 * 
 * The plugin is alpha channel aware and will try to negotiate with a format
 * that supports alpha channels first. When alpha channel is active two
 * other properties, alpha and border_alpha can be used to set the alpha
 * values of the inner picture and the border respectively. an alpha value of
 * 0.0 means total transparency, 1.0 is opaque.
 * 
 * The videobox plugin has many uses such as doing a mosaic of pictures, 
 * letterboxing video, cutting out pieces of video, picture in picture, etc..
 *
 * Setting autocrop to true changes the behavior of the plugin so that
 * caps determine crop properties rather than the other way around: given
 * input and output dimensions, the crop values are selected so that the
 * smaller frame is effectively centered in the larger frame.  This
 * involves either cropping or padding.
 * 
 * If you use autocrop there is little point in setting the other
 * properties manually because they will be overriden if the caps change,
 * but nothing stops you from doing so.
 * 
 * Sample pipeline:
 * |[
 * gst-launch videotestsrc ! videobox autocrop=true ! \
 *   "video/x-raw-yuv, width=600, height=400" ! ffmpegcolorspace ! ximagesink
 * ]|
 */

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

#include "gstvideobox.h"

#include <math.h>
#include <liboil/liboil.h>
#include <string.h>

#include <gst/controller/gstcontroller.h>

GST_DEBUG_CATEGORY_STATIC (videobox_debug);
#define GST_CAT_DEFAULT videobox_debug

/* From videotestsrc.c */
static const guint8 yuv_sdtv_colors_Y[VIDEO_BOX_FILL_LAST] = { 16, 145, 41 };
static const guint8 yuv_sdtv_colors_U[VIDEO_BOX_FILL_LAST] = { 128, 54, 240 };
static const guint8 yuv_sdtv_colors_V[VIDEO_BOX_FILL_LAST] = { 128, 34, 110 };

static const guint8 yuv_hdtv_colors_Y[VIDEO_BOX_FILL_LAST] = { 16, 173, 32 };
static const guint8 yuv_hdtv_colors_U[VIDEO_BOX_FILL_LAST] = { 128, 42, 240 };
static const guint8 yuv_hdtv_colors_V[VIDEO_BOX_FILL_LAST] = { 128, 26, 118 };

static const guint8 rgb_colors_R[VIDEO_BOX_FILL_LAST] = { 0, 255, 0 };
static const guint8 rgb_colors_G[VIDEO_BOX_FILL_LAST] = { 0, 0, 0 };
static const guint8 rgb_colors_B[VIDEO_BOX_FILL_LAST] = { 0, 255, 255 };

/* Generated by -bad/ext/cog/generate_tables */
static const int cog_ycbcr_to_rgb_matrix_8bit_hdtv[] = {
  298, 0, 459, -63514,
  298, -55, -136, 19681,
  298, 541, 0, -73988,
};

static const int cog_ycbcr_to_rgb_matrix_8bit_sdtv[] = {
  298, 0, 409, -57068,
  298, -100, -208, 34707,
  298, 516, 0, -70870,
};

static const gint cog_rgb_to_ycbcr_matrix_8bit_hdtv[] = {
  47, 157, 16, 4096,
  -26, -87, 112, 32768,
  112, -102, -10, 32768,
};

static const gint cog_rgb_to_ycbcr_matrix_8bit_sdtv[] = {
  66, 129, 25, 4096,
  -38, -74, 112, 32768,
  112, -94, -18, 32768,
};

static const gint cog_ycbcr_sdtv_to_ycbcr_hdtv_matrix_8bit[] = {
  256, -30, -53, 10600,
  0, 261, 29, -4367,
  0, 19, 262, -3289,
};

static const gint cog_ycbcr_hdtv_to_ycbcr_sdtv_matrix_8bit[] = {
  256, 25, 49, -9536,
  0, 253, -28, 3958,
  0, -19, 252, 2918,
};

#define APPLY_MATRIX(m,o,v1,v2,v3) ((m[o*4] * v1 + m[o*4+1] * v2 + m[o*4+2] * v3 + m[o*4+3]) >> 8)

static void
fill_ayuv (GstVideoBoxFill fill_type, guint b_alpha, guint8 * dest,
    gboolean sdtv, gint width, gint height)
{
  guint32 empty_pixel;

  if (sdtv)
    empty_pixel = GUINT32_FROM_BE ((b_alpha << 24) |
        (yuv_sdtv_colors_Y[fill_type] << 16) |
        (yuv_sdtv_colors_U[fill_type] << 8) | yuv_sdtv_colors_V[fill_type]);
  else
    empty_pixel = GUINT32_FROM_BE ((b_alpha << 24) |
        (yuv_hdtv_colors_Y[fill_type] << 16) |
        (yuv_hdtv_colors_U[fill_type] << 8) | yuv_hdtv_colors_V[fill_type]);

  oil_splat_u32_ns ((guint32 *) dest, &empty_pixel, width * height);
}

static void
copy_ayuv_ayuv (guint i_alpha, guint8 * dest, gboolean dest_sdtv,
    gint dest_width, gint dest_height, gint dest_x, gint dest_y,
    const guint8 * src, gboolean src_sdtv, gint src_width, gint src_height,
    gint src_x, gint src_y, gint w, gint h)
{
  gint i, j;
  gint src_stride = 4 * src_width;
  gint dest_stride = 4 * dest_width;

  dest = dest + dest_y * dest_width * 4 + dest_x * 4;
  src = src + src_y * src_width * 4 + src_x * 4;

  w *= 4;

  if (dest_sdtv != src_sdtv) {
    gint matrix[12];
    gint y, u, v;

    memcpy (matrix,
        dest_sdtv ? cog_ycbcr_hdtv_to_ycbcr_sdtv_matrix_8bit :
        cog_ycbcr_sdtv_to_ycbcr_hdtv_matrix_8bit, 12 * sizeof (gint));

    for (i = 0; i < h; i++) {
      for (j = 0; j < w; j += 4) {
        dest[j] = (src[j] * i_alpha) >> 8;
        y = src[j + 1];
        u = src[j + 2];
        v = src[j + 3];
        dest[j + 1] = APPLY_MATRIX (matrix, 0, y, u, v);
        dest[j + 2] = APPLY_MATRIX (matrix, 1, y, u, v);
        dest[j + 3] = APPLY_MATRIX (matrix, 2, y, u, v);
      }
      dest += dest_stride;
      src += src_stride;
    }
  } else {
    for (i = 0; i < h; i++) {
      for (j = 0; j < w; j += 4) {
        dest[j] = (src[j] * i_alpha) >> 8;
        dest[j + 1] = src[j + 1];
        dest[j + 2] = src[j + 2];
        dest[j + 3] = src[j + 3];
      }
      dest += dest_stride;
      src += src_stride;
    }
  }
}

static void
copy_ayuv_i420 (guint i_alpha, guint8 * dest, gboolean dest_sdtv,
    gint dest_width, gint dest_height, gint dest_x, gint dest_y,
    const guint8 * src, gboolean src_sdtv, gint src_width, gint src_height,
    gint src_x, gint src_y, gint w, gint h)
{
  gint i, j;
  guint8 *destY, *destU, *destV;
  gint dest_strideY, dest_strideUV;
  gint widthY, widthUV;
  gint hY, hUV;

  dest_strideY =
      gst_video_format_get_row_stride (GST_VIDEO_FORMAT_I420, 0, dest_width);
  dest_strideUV =
      gst_video_format_get_row_stride (GST_VIDEO_FORMAT_I420, 1, dest_width);

  destY =
      dest + gst_video_format_get_component_offset (GST_VIDEO_FORMAT_I420, 0,
      dest_width, dest_height);
  destU =
      dest + gst_video_format_get_component_offset (GST_VIDEO_FORMAT_I420, 1,
      dest_width, dest_height);
  destV =
      dest + gst_video_format_get_component_offset (GST_VIDEO_FORMAT_I420, 2,
      dest_width, dest_height);

  destY = destY + dest_y * dest_strideY + dest_x;
  destU = destU + (dest_y / 2) * dest_strideUV + dest_x / 2;
  destV = destV + (dest_y / 2) * dest_strideUV + dest_x / 2;

  src = src + src_y * src_width * 4 + src_x * 4;

  widthY = w;
  widthUV = w / 2;

  hY = h;
  hUV = h / 2;

  if (src_sdtv != dest_sdtv) {
    gint matrix[12];
    gint y1, y2, y3, y4;
    gint u1, u2, u3, u4;
    gint v1, v2, v3, v4;
    guint8 *destY2 = destY + dest_strideY;
    const guint8 *src2 = src + src_width * 4;

    dest_strideY *= 2;

    memcpy (matrix,
        dest_sdtv ? cog_ycbcr_hdtv_to_ycbcr_sdtv_matrix_8bit :
        cog_ycbcr_sdtv_to_ycbcr_hdtv_matrix_8bit, 12 * sizeof (gint));

    for (i = 0; i < hUV; i++) {
      if (i * 2 == hY) {
        destY2 = destY;
      }

      for (j = 0; j < widthUV; j++) {
        y1 = src[8 * j + 1];
        u1 = src[8 * j + 2];
        v1 = src[8 * j + 3];
        y2 = src[8 * j + 5];
        u2 = src[8 * j + 6];
        v2 = src[8 * j + 7];

        if (j * 2 < widthY) {
          y3 = src2[8 * j + 1];
          u3 = src2[8 * j + 2];
          v3 = src2[8 * j + 3];
          y4 = src2[8 * j + 5];
          u4 = src2[8 * j + 6];
          v4 = src2[8 * j + 7];
        } else {
          y3 = y1;
          u3 = u1;
          v3 = v1;
          y4 = y2;
          u4 = u2;
          v4 = v2;
        }

        y1 = APPLY_MATRIX (matrix, 0, y1, u1, v1);
        u1 = APPLY_MATRIX (matrix, 1, y1, u1, v1);
        v1 = APPLY_MATRIX (matrix, 2, y1, u1, v1);

        y3 = APPLY_MATRIX (matrix, 0, y3, u3, v3);
        u3 = APPLY_MATRIX (matrix, 1, y3, u3, v3);
        v3 = APPLY_MATRIX (matrix, 2, y3, u3, v3);

        if (j * 2 < widthY) {
          y2 = APPLY_MATRIX (matrix, 0, y2, u2, v2);
          u2 = APPLY_MATRIX (matrix, 1, y2, u2, v2);
          v2 = APPLY_MATRIX (matrix, 2, y2, u2, v2);

          y4 = APPLY_MATRIX (matrix, 0, y4, u4, v4);
          u4 = APPLY_MATRIX (matrix, 1, y4, u4, v4);
          v4 = APPLY_MATRIX (matrix, 2, y4, u4, v4);
        } else {
          u2 = u1;
          v2 = v1;
          u4 = u3;
          v4 = v3;
        }

        destY[2 * j] = y1;
        destY2[2 * j] = y3;
        if (j * 2 < widthY) {
          destY[2 * j + 1] = y2;
          destY2[2 * j + 1] = y4;
        }

        destU[j] = (u1 + u2 + u3 + u4) / 4;
        destV[j] = (v1 + v2 + v3 + v4) / 4;
      }
      src += src_width * 8;
      destY += dest_strideY;
      src2 += src_width * 8;
      destY2 += dest_strideY;

      destU += dest_strideUV;
      destV += dest_strideUV;
    }
  } else {
    gint y1, y2, y3, y4;
    gint u1, u2, u3, u4;
    gint v1, v2, v3, v4;
    guint8 *destY2 = destY + dest_strideY;
    const guint8 *src2 = src + src_width * 4;

    dest_strideY *= 2;

    for (i = 0; i < hUV; i++) {
      if (i * 2 == hY) {
        destY2 = destY;
      }

      for (j = 0; j < widthUV; j++) {
        y1 = src[8 * j + 1];
        u1 = src[8 * j + 2];
        v1 = src[8 * j + 3];
        y2 = src[8 * j + 5];
        u2 = src[8 * j + 6];
        v2 = src[8 * j + 7];

        if (j * 2 < widthY) {
          y3 = src2[8 * j + 1];
          u3 = src2[8 * j + 2];
          v3 = src2[8 * j + 3];
          y4 = src2[8 * j + 5];
          u4 = src2[8 * j + 6];
          v4 = src2[8 * j + 7];
        } else {
          y3 = y1;
          u3 = u1;
          v3 = v1;
          y4 = y2;
          u4 = u2;
          v4 = v2;
        }

        destY[2 * j] = y1;
        destY2[2 * j] = y3;
        if (j * 2 < widthY) {
          destY[2 * j + 1] = y2;
          destY2[2 * j + 1] = y4;
        }

        destU[j] = (u1 + u2 + u3 + u4) / 4;
        destV[j] = (v1 + v2 + v3 + v4) / 4;
      }
      src += src_width * 8;
      destY += dest_strideY;
      src2 += src_width * 8;
      destY2 += dest_strideY;

      destU += dest_strideUV;
      destV += dest_strideUV;
    }
  }
}

static void
fill_i420 (GstVideoBoxFill fill_type, guint b_alpha, guint8 * dest,
    gboolean sdtv, gint width, gint height)
{
  guint8 empty_pixel[3];
  guint8 *destY, *destU, *destV;
  gint strideY, strideUV;
  gint heightY, heightUV;

  if (sdtv) {
    empty_pixel[0] = yuv_sdtv_colors_Y[fill_type];
    empty_pixel[1] = yuv_sdtv_colors_U[fill_type];
    empty_pixel[2] = yuv_sdtv_colors_V[fill_type];
  } else {
    empty_pixel[0] = yuv_hdtv_colors_Y[fill_type];
    empty_pixel[1] = yuv_hdtv_colors_U[fill_type];
    empty_pixel[2] = yuv_hdtv_colors_V[fill_type];
  }

  strideY = gst_video_format_get_row_stride (GST_VIDEO_FORMAT_I420, 0, width);
  strideUV = gst_video_format_get_row_stride (GST_VIDEO_FORMAT_I420, 1, width);

  destY =
      dest + gst_video_format_get_component_offset (GST_VIDEO_FORMAT_I420, 0,
      width, height);
  destU =
      dest + gst_video_format_get_component_offset (GST_VIDEO_FORMAT_I420, 1,
      width, height);
  destV =
      dest + gst_video_format_get_component_offset (GST_VIDEO_FORMAT_I420, 2,
      width, height);

  heightY =
      gst_video_format_get_component_height (GST_VIDEO_FORMAT_I420, 0, height);
  heightUV =
      gst_video_format_get_component_height (GST_VIDEO_FORMAT_I420, 1, height);

  oil_splat_u8_ns (destY, &empty_pixel[0], strideY * heightY);
  oil_splat_u8_ns (destU, &empty_pixel[1], strideUV * heightUV);
  oil_splat_u8_ns (destV, &empty_pixel[2], strideUV * heightUV);
}

static void
copy_i420_i420 (guint i_alpha, guint8 * dest, gboolean dest_sdtv,
    gint dest_width, gint dest_height, gint dest_x, gint dest_y,
    const guint8 * src, gboolean src_sdtv, gint src_width, gint src_height,
    gint src_x, gint src_y, gint w, gint h)
{
  gint i;
  guint8 *destY, *destU, *destV;
  const guint8 *srcY, *srcU, *srcV;
  gint dest_strideY, dest_strideUV;
  gint src_strideY, src_strideUV;
  gint widthY, widthUV;
  gint hY, hUV;

  dest_strideY =
      gst_video_format_get_row_stride (GST_VIDEO_FORMAT_I420, 0, dest_width);
  dest_strideUV =
      gst_video_format_get_row_stride (GST_VIDEO_FORMAT_I420, 1, dest_width);
  src_strideY =
      gst_video_format_get_row_stride (GST_VIDEO_FORMAT_I420, 0, src_width);
  src_strideUV =
      gst_video_format_get_row_stride (GST_VIDEO_FORMAT_I420, 1, src_width);

  destY =
      dest + gst_video_format_get_component_offset (GST_VIDEO_FORMAT_I420, 0,
      dest_width, dest_height);
  destU =
      dest + gst_video_format_get_component_offset (GST_VIDEO_FORMAT_I420, 1,
      dest_width, dest_height);
  destV =
      dest + gst_video_format_get_component_offset (GST_VIDEO_FORMAT_I420, 2,
      dest_width, dest_height);

  srcY =
      src + gst_video_format_get_component_offset (GST_VIDEO_FORMAT_I420, 0,
      src_width, src_height);
  srcU =
      src + gst_video_format_get_component_offset (GST_VIDEO_FORMAT_I420, 1,
      src_width, src_height);
  srcV =
      src + gst_video_format_get_component_offset (GST_VIDEO_FORMAT_I420, 2,
      src_width, src_height);


  destY = destY + dest_y * dest_strideY + dest_x;
  destU = destU + (dest_y / 2) * dest_strideUV + dest_x / 2;
  destV = destV + (dest_y / 2) * dest_strideUV + dest_x / 2;

  srcY = srcY + src_y * src_strideY + src_x;
  srcU = srcU + (src_y / 2) * src_strideUV + src_x / 2;
  srcV = srcV + (src_y / 2) * src_strideUV + src_x / 2;

  widthY = w;
  widthUV = (w + 1) / 2;

  hY = h;
  hUV = (h + 1) / 2;

  if (src_sdtv != dest_sdtv) {
    gint matrix[12];
    gint y1, y2, y3, y4;
    gint u1, u2, u3, u4;
    gint v1, v2, v3, v4;
    gint j;
    guint8 *destY2 = destY + dest_strideY;
    const guint8 *srcY2 = srcY + src_strideY;

    dest_strideY *= 2;
    src_strideY *= 2;

    memcpy (matrix,
        dest_sdtv ? cog_ycbcr_hdtv_to_ycbcr_sdtv_matrix_8bit :
        cog_ycbcr_sdtv_to_ycbcr_hdtv_matrix_8bit, 12 * sizeof (gint));

    for (i = 0; i < hUV; i++) {
      if (i * 2 == hY) {
        destY2 = destY;
        srcY2 = srcY;
      }

      for (j = 0; j < widthUV; j++) {
        y1 = srcY[2 * j];
        y2 = srcY[2 * j + 1];
        y3 = srcY2[2 * j];
        y4 = srcY2[2 * j + 1];

        u1 = u2 = u3 = u4 = srcU[j];
        v1 = v2 = v3 = v4 = srcV[j];

        y1 = APPLY_MATRIX (matrix, 0, y1, u1, v1);
        u1 = APPLY_MATRIX (matrix, 1, y1, u1, v1);
        v1 = APPLY_MATRIX (matrix, 2, y1, u1, v1);

        y2 = APPLY_MATRIX (matrix, 0, y2, u2, v2);
        u2 = APPLY_MATRIX (matrix, 1, y2, u2, v2);
        v2 = APPLY_MATRIX (matrix, 2, y2, u2, v2);

        y3 = APPLY_MATRIX (matrix, 0, y3, u3, v3);
        u3 = APPLY_MATRIX (matrix, 1, y3, u3, v3);
        v3 = APPLY_MATRIX (matrix, 2, y3, u3, v3);

        y4 = APPLY_MATRIX (matrix, 0, y4, u4, v4);
        u4 = APPLY_MATRIX (matrix, 1, y4, u4, v4);
        v4 = APPLY_MATRIX (matrix, 2, y4, u4, v4);

        destY[2 * j] = y1;
        destY[2 * j + 1] = y2;
        destY2[2 * j] = y3;
        destY2[2 * j + 1] = y4;

        destU[j] = (u1 + u2 + u3 + u4) / 4;
        destV[j] = (v1 + v2 + v3 + v4) / 4;
      }
      destY += dest_strideY;
      srcY += src_strideY;
      destY2 += dest_strideY;
      srcY2 += src_strideY;

      destU += dest_strideUV;
      destV += dest_strideUV;
      srcU += src_strideUV;
      srcV += src_strideUV;
    }
  } else {
    for (i = 0; i < hY; i++) {
      oil_copy_u8 (destY, srcY, widthY);
      destY += dest_strideY;
      srcY += src_strideY;
    }

    for (i = 0; i < hUV; i++) {
      oil_copy_u8 (destU, srcU, widthUV);
      oil_copy_u8 (destV, srcV, widthUV);
      destU += dest_strideUV;
      destV += dest_strideUV;
      srcU += src_strideUV;
      srcV += src_strideUV;
    }
  }
}

static void
copy_i420_ayuv (guint i_alpha, guint8 * dest, gboolean dest_sdtv,
    gint dest_width, gint dest_height, gint dest_x, gint dest_y,
    const guint8 * src, gboolean src_sdtv, gint src_width, gint src_height,
    gint src_x, gint src_y, gint w, gint h)
{
  gint i;
  const guint8 *srcY, *srcU, *srcV;
  gint src_strideY, src_strideUV;
  gint widthY, widthUV;
  gint hY, hUV;

  src_strideY =
      gst_video_format_get_row_stride (GST_VIDEO_FORMAT_I420, 0, src_width);
  src_strideUV =
      gst_video_format_get_row_stride (GST_VIDEO_FORMAT_I420, 1, src_width);

  srcY =
      src + gst_video_format_get_component_offset (GST_VIDEO_FORMAT_I420, 0,
      src_width, src_height);
  srcU =
      src + gst_video_format_get_component_offset (GST_VIDEO_FORMAT_I420, 1,
      src_width, src_height);
  srcV =
      src + gst_video_format_get_component_offset (GST_VIDEO_FORMAT_I420, 2,
      src_width, src_height);


  dest = dest + dest_y * dest_width * 4 + dest_x * 4;

  srcY = srcY + src_y * src_strideY + src_x;
  srcU = srcU + (src_y / 2) * src_strideUV + src_x / 2;
  srcV = srcV + (src_y / 2) * src_strideUV + src_x / 2;

  widthY = w;
  widthUV = (w + 1) / 2;

  hY = h;
  hUV = (h + 1) / 2;

  if (src_sdtv != dest_sdtv) {
    gint matrix[12];
    gint y1, y2, y3, y4;
    gint u1, u2, u3, u4;
    gint v1, v2, v3, v4;
    gint j;
    guint8 *dest2;
    const guint8 *srcY2 = srcY + src_strideY;

    dest2 = dest + dest_width * 4;

    src_strideY *= 2;

    memcpy (matrix,
        dest_sdtv ? cog_ycbcr_hdtv_to_ycbcr_sdtv_matrix_8bit :
        cog_ycbcr_sdtv_to_ycbcr_hdtv_matrix_8bit, 12 * sizeof (gint));

    for (i = 0; i < hUV; i++) {
      if (i * 2 == hY) {
        srcY2 = srcY;
      }

      for (j = 0; j < widthUV; j++) {
        y1 = srcY[2 * j];
        y3 = srcY2[2 * j];
        y2 = (j * 2 < widthY) ? srcY[2 * j + 1] : y1;
        y4 = (j * 2 < widthY) ? srcY2[2 * j + 1] : y3;

        u1 = u2 = u3 = u4 = srcU[j];
        v1 = v2 = v3 = v4 = srcV[j];

        y1 = APPLY_MATRIX (matrix, 0, y1, u1, v1);
        u1 = APPLY_MATRIX (matrix, 1, y1, u1, v1);
        v1 = APPLY_MATRIX (matrix, 2, y1, u1, v1);

        y3 = APPLY_MATRIX (matrix, 0, y3, u3, v3);
        u3 = APPLY_MATRIX (matrix, 1, y3, u3, v3);
        v3 = APPLY_MATRIX (matrix, 2, y3, u3, v3);

        if (j * 2 < widthY) {
          y2 = APPLY_MATRIX (matrix, 0, y2, u2, v2);
          u2 = APPLY_MATRIX (matrix, 1, y2, u2, v2);
          v2 = APPLY_MATRIX (matrix, 2, y2, u2, v2);

          y4 = APPLY_MATRIX (matrix, 0, y4, u4, v4);
          u4 = APPLY_MATRIX (matrix, 1, y4, u4, v4);
          v4 = APPLY_MATRIX (matrix, 2, y4, u4, v4);
        }

        dest[8 * j] = i_alpha;
        dest[8 * j + 1] = y1;
        dest[8 * j + 2] = u1;
        dest[8 * j + 3] = v1;
        dest2[8 * j] = i_alpha;
        dest2[8 * j + 1] = y3;
        dest2[8 * j + 2] = u3;
        dest2[8 * j + 3] = v3;
        if (j * 2 < widthY) {
          dest[8 * j + 4] = i_alpha;
          dest[8 * j + 5] = y2;
          dest[8 * j + 6] = u2;
          dest[8 * j + 7] = v2;
          dest2[8 * j + 4] = i_alpha;
          dest2[8 * j + 5] = y4;
          dest2[8 * j + 6] = u4;
          dest2[8 * j + 7] = v4;
        }
      }
      dest += dest_width * 8;
      srcY += src_strideY;
      dest2 += dest_width * 8;
      srcY2 += src_strideY;

      srcU += src_strideUV;
      srcV += src_strideUV;
    }
  } else {
    gint y1, y2, y3, y4;
    gint u1, u2, u3, u4;
    gint v1, v2, v3, v4;
    gint j;
    guint8 *dest2;
    const guint8 *srcY2 = srcY + src_strideY;

    dest2 = dest + dest_width * 4;

    src_strideY *= 2;

    for (i = 0; i < hUV; i++) {
      if (i * 2 == hY) {
        srcY2 = srcY;
      }

      for (j = 0; j < widthUV; j++) {
        y1 = srcY[2 * j];
        y3 = srcY2[2 * j];
        y2 = (j * 2 < widthY) ? srcY[2 * j + 1] : y1;
        y4 = (j * 2 < widthY) ? srcY2[2 * j + 1] : y3;

        u1 = u2 = u3 = u4 = srcU[j];
        v1 = v2 = v3 = v4 = srcV[j];

        dest[8 * j] = i_alpha;
        dest[8 * j + 1] = y1;
        dest[8 * j + 2] = u1;
        dest[8 * j + 3] = v1;
        dest2[8 * j] = i_alpha;
        dest2[8 * j + 1] = y3;
        dest2[8 * j + 2] = u3;
        dest2[8 * j + 3] = v3;
        if (j * 2 < widthY) {
          dest[8 * j + 4] = i_alpha;
          dest[8 * j + 5] = y2;
          dest[8 * j + 6] = u2;
          dest[8 * j + 7] = v2;
          dest2[8 * j + 4] = i_alpha;
          dest2[8 * j + 5] = y4;
          dest2[8 * j + 6] = u4;
          dest2[8 * j + 7] = v4;
        }
      }
      dest += dest_width * 8;
      srcY += src_strideY;
      dest2 += dest_width * 8;
      srcY2 += src_strideY;

      srcU += src_strideUV;
      srcV += src_strideUV;
    }
  }
}

#define DEFAULT_LEFT      0
#define DEFAULT_RIGHT     0
#define DEFAULT_TOP       0
#define DEFAULT_BOTTOM    0
#define DEFAULT_FILL_TYPE VIDEO_BOX_FILL_BLACK
#define DEFAULT_ALPHA     1.0
#define DEFAULT_BORDER_ALPHA 1.0

enum
{
  PROP_0,
  PROP_LEFT,
  PROP_RIGHT,
  PROP_TOP,
  PROP_BOTTOM,
  PROP_FILL_TYPE,
  PROP_ALPHA,
  PROP_BORDER_ALPHA,
  PROP_AUTOCROP
      /* FILL ME */
};

static GstStaticPadTemplate gst_video_box_src_template =
    GST_STATIC_PAD_TEMPLATE ("src",
    GST_PAD_SRC,
    GST_PAD_ALWAYS,
    GST_STATIC_CAPS (GST_VIDEO_CAPS_YUV ("AYUV") ";"
        GST_VIDEO_CAPS_YUV ("I420"))
    );

static GstStaticPadTemplate gst_video_box_sink_template =
    GST_STATIC_PAD_TEMPLATE ("sink",
    GST_PAD_SINK,
    GST_PAD_ALWAYS,
    GST_STATIC_CAPS (GST_VIDEO_CAPS_YUV ("AYUV") ";"
        GST_VIDEO_CAPS_YUV ("I420"))
    );

GST_BOILERPLATE (GstVideoBox, gst_video_box, GstBaseTransform,
    GST_TYPE_BASE_TRANSFORM);

static void gst_video_box_set_property (GObject * object, guint prop_id,
    const GValue * value, GParamSpec * pspec);
static void gst_video_box_get_property (GObject * object, guint prop_id,
    GValue * value, GParamSpec * pspec);

static gboolean gst_video_box_recalc_transform (GstVideoBox * video_box);
static GstCaps *gst_video_box_transform_caps (GstBaseTransform * trans,
    GstPadDirection direction, GstCaps * from);
static gboolean gst_video_box_set_caps (GstBaseTransform * trans,
    GstCaps * in, GstCaps * out);
static gboolean gst_video_box_get_unit_size (GstBaseTransform * trans,
    GstCaps * caps, guint * size);
static GstFlowReturn gst_video_box_transform (GstBaseTransform * trans,
    GstBuffer * in, GstBuffer * out);
static void gst_video_box_fixate_caps (GstBaseTransform * trans,
    GstPadDirection direction, GstCaps * caps, GstCaps * othercaps);

#define GST_TYPE_VIDEO_BOX_FILL (gst_video_box_fill_get_type())
static GType
gst_video_box_fill_get_type (void)
{
  static GType video_box_fill_type = 0;
  static const GEnumValue video_box_fill[] = {
    {VIDEO_BOX_FILL_BLACK, "Black", "black"},
    {VIDEO_BOX_FILL_GREEN, "Colorkey green", "green"},
    {VIDEO_BOX_FILL_BLUE, "Colorkey blue", "blue"},
    {0, NULL, NULL},
  };

  if (!video_box_fill_type) {
    video_box_fill_type =
        g_enum_register_static ("GstVideoBoxFill", video_box_fill);
  }
  return video_box_fill_type;
}


static void
gst_video_box_base_init (gpointer g_class)
{
  GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);

  gst_element_class_set_details_simple (element_class, "Video box filter",
      "Filter/Effect/Video",
      "Resizes a video by adding borders or cropping",
      "Wim Taymans <wim@fluendo.com>");

  gst_element_class_add_pad_template (element_class,
      gst_static_pad_template_get (&gst_video_box_sink_template));
  gst_element_class_add_pad_template (element_class,
      gst_static_pad_template_get (&gst_video_box_src_template));
}

static void
gst_video_box_finalize (GObject * object)
{
  GstVideoBox *video_box = GST_VIDEO_BOX (object);

  if (video_box->mutex) {
    g_mutex_free (video_box->mutex);
    video_box->mutex = NULL;
  }

  G_OBJECT_CLASS (parent_class)->finalize (object);
}

static void
gst_video_box_class_init (GstVideoBoxClass * klass)
{
  GObjectClass *gobject_class = (GObjectClass *) klass;
  GstBaseTransformClass *trans_class = (GstBaseTransformClass *) klass;

  gobject_class->set_property = gst_video_box_set_property;
  gobject_class->get_property = gst_video_box_get_property;
  gobject_class->finalize = gst_video_box_finalize;

  g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_FILL_TYPE,
      g_param_spec_enum ("fill", "Fill", "How to fill the borders",
          GST_TYPE_VIDEO_BOX_FILL, DEFAULT_FILL_TYPE,
          G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS | GST_PARAM_CONTROLLABLE));
  g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_LEFT,
      g_param_spec_int ("left", "Left",
          "Pixels to box at left (<0  = add a border)", G_MININT, G_MAXINT,
          DEFAULT_LEFT,
          G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS | GST_PARAM_CONTROLLABLE));
  g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_RIGHT,
      g_param_spec_int ("right", "Right",
          "Pixels to box at right (<0 = add a border)", G_MININT, G_MAXINT,
          DEFAULT_RIGHT,
          G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS | GST_PARAM_CONTROLLABLE));
  g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_TOP,
      g_param_spec_int ("top", "Top",
          "Pixels to box at top (<0 = add a border)", G_MININT, G_MAXINT,
          DEFAULT_TOP,
          G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS | GST_PARAM_CONTROLLABLE));
  g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_BOTTOM,
      g_param_spec_int ("bottom", "Bottom",
          "Pixels to box at bottom (<0 = add a border)", G_MININT, G_MAXINT,
          DEFAULT_BOTTOM,
          G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS | GST_PARAM_CONTROLLABLE));
  g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_ALPHA,
      g_param_spec_double ("alpha", "Alpha", "Alpha value picture", 0.0, 1.0,
          DEFAULT_ALPHA,
          G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS | GST_PARAM_CONTROLLABLE));
  g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_BORDER_ALPHA,
      g_param_spec_double ("border-alpha", "Border Alpha",
          "Alpha value of the border", 0.0, 1.0, DEFAULT_BORDER_ALPHA,
          G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS | GST_PARAM_CONTROLLABLE));
  /**
   * GstVideoBox:autocrop
   *
   * If set to %TRUE videobox will automatically crop/pad the input
   * video to be centered in the output.
   *
   * Since: 0.10.16
   **/
  g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_AUTOCROP,
      g_param_spec_boolean ("autocrop", "Auto crop",
          "Auto crop", FALSE, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));

  trans_class->transform = GST_DEBUG_FUNCPTR (gst_video_box_transform);
  trans_class->transform_caps =
      GST_DEBUG_FUNCPTR (gst_video_box_transform_caps);
  trans_class->set_caps = GST_DEBUG_FUNCPTR (gst_video_box_set_caps);
  trans_class->get_unit_size = GST_DEBUG_FUNCPTR (gst_video_box_get_unit_size);
  trans_class->fixate_caps = GST_DEBUG_FUNCPTR (gst_video_box_fixate_caps);
}

static void
gst_video_box_init (GstVideoBox * video_box, GstVideoBoxClass * g_class)
{
  video_box->box_right = DEFAULT_RIGHT;
  video_box->box_left = DEFAULT_LEFT;
  video_box->box_top = DEFAULT_TOP;
  video_box->box_bottom = DEFAULT_BOTTOM;
  video_box->crop_right = 0;
  video_box->crop_left = 0;
  video_box->crop_top = 0;
  video_box->crop_bottom = 0;
  video_box->fill_type = DEFAULT_FILL_TYPE;
  video_box->alpha = DEFAULT_ALPHA;
  video_box->border_alpha = DEFAULT_BORDER_ALPHA;
  video_box->autocrop = FALSE;

  video_box->mutex = g_mutex_new ();
}

static void
gst_video_box_set_property (GObject * object, guint prop_id,
    const GValue * value, GParamSpec * pspec)
{
  GstVideoBox *video_box = GST_VIDEO_BOX (object);

  g_mutex_lock (video_box->mutex);
  switch (prop_id) {
    case PROP_LEFT:
      video_box->box_left = g_value_get_int (value);
      if (video_box->box_left < 0) {
        video_box->border_left = -video_box->box_left;
        video_box->crop_left = 0;
      } else {
        video_box->border_left = 0;
        video_box->crop_left = video_box->box_left;
      }
      break;
    case PROP_RIGHT:
      video_box->box_right = g_value_get_int (value);
      if (video_box->box_right < 0) {
        video_box->border_right = -video_box->box_right;
        video_box->crop_right = 0;
      } else {
        video_box->border_right = 0;
        video_box->crop_right = video_box->box_right;
      }
      break;
    case PROP_TOP:
      video_box->box_top = g_value_get_int (value);
      if (video_box->box_top < 0) {
        video_box->border_top = -video_box->box_top;
        video_box->crop_top = 0;
      } else {
        video_box->border_top = 0;
        video_box->crop_top = video_box->box_top;
      }
      break;
    case PROP_BOTTOM:
      video_box->box_bottom = g_value_get_int (value);
      if (video_box->box_bottom < 0) {
        video_box->border_bottom = -video_box->box_bottom;
        video_box->crop_bottom = 0;
      } else {
        video_box->border_bottom = 0;
        video_box->crop_bottom = video_box->box_bottom;
      }
      break;
    case PROP_FILL_TYPE:
      video_box->fill_type = g_value_get_enum (value);
      break;
    case PROP_ALPHA:
      video_box->alpha = g_value_get_double (value);
      break;
    case PROP_BORDER_ALPHA:
      video_box->border_alpha = g_value_get_double (value);
      break;
    case PROP_AUTOCROP:
      video_box->autocrop = g_value_get_boolean (value);
      break;
    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
      break;
  }
  gst_video_box_recalc_transform (video_box);

  GST_DEBUG_OBJECT (video_box, "Calling reconfigure");
  gst_base_transform_reconfigure (GST_BASE_TRANSFORM_CAST (video_box));

  g_mutex_unlock (video_box->mutex);
}

static void
gst_video_box_autocrop (GstVideoBox * video_box)
{
  gint crop_w = video_box->in_width - video_box->out_width;
  gint crop_h = video_box->in_height - video_box->out_height;

  video_box->box_left = crop_w / 2;
  if (video_box->box_left < 0) {
    video_box->border_left = -video_box->box_left;
    video_box->crop_left = 0;
  } else {
    video_box->border_left = 0;
    video_box->crop_left = video_box->box_left;
  }

  /* Round down/up for odd width differences */
  if (crop_w < 0)
    crop_w -= 1;
  else
    crop_w += 1;

  video_box->box_right = crop_w / 2;
  if (video_box->box_right < 0) {
    video_box->border_right = -video_box->box_right;
    video_box->crop_right = 0;
  } else {
    video_box->border_right = 0;
    video_box->crop_right = video_box->box_right;
  }

  video_box->box_top = crop_h / 2;
  if (video_box->box_top < 0) {
    video_box->border_top = -video_box->box_top;
    video_box->crop_top = 0;
  } else {
    video_box->border_top = 0;
    video_box->crop_top = video_box->box_top;
  }

  /* Round down/up for odd height differences */
  if (crop_h < 0)
    crop_h -= 1;
  else
    crop_h += 1;
  video_box->box_bottom = crop_h / 2;

  if (video_box->box_bottom < 0) {
    video_box->border_bottom = -video_box->box_bottom;
    video_box->crop_bottom = 0;
  } else {
    video_box->border_bottom = 0;
    video_box->crop_bottom = video_box->box_bottom;
  }
}

static void
gst_video_box_get_property (GObject * object, guint prop_id, GValue * value,
    GParamSpec * pspec)
{
  GstVideoBox *video_box = GST_VIDEO_BOX (object);

  switch (prop_id) {
    case PROP_LEFT:
      g_value_set_int (value, video_box->box_left);
      break;
    case PROP_RIGHT:
      g_value_set_int (value, video_box->box_right);
      break;
    case PROP_TOP:
      g_value_set_int (value, video_box->box_top);
      break;
    case PROP_BOTTOM:
      g_value_set_int (value, video_box->box_bottom);
      break;
    case PROP_FILL_TYPE:
      g_value_set_enum (value, video_box->fill_type);
      break;
    case PROP_ALPHA:
      g_value_set_double (value, video_box->alpha);
      break;
    case PROP_BORDER_ALPHA:
      g_value_set_double (value, video_box->border_alpha);
      break;
    case PROP_AUTOCROP:
      g_value_set_boolean (value, video_box->autocrop);
      break;
    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
      break;
  }
}

static GstCaps *
gst_video_box_transform_caps (GstBaseTransform * trans,
    GstPadDirection direction, GstCaps * from)
{
  GstVideoBox *video_box = GST_VIDEO_BOX (trans);
  GstCaps *to, *ret;
  const GstCaps *templ;
  GstStructure *structure;
  GstPad *other;
  gint width, height;

  to = gst_caps_copy (from);
  structure = gst_caps_get_structure (to, 0);

  /* get rid of format */
  gst_structure_remove_field (structure, "format");
  gst_structure_remove_field (structure, "color-matrix");
  gst_structure_remove_field (structure, "chroma-site");

  /* otherwise caps nego will fail: */
  if (video_box->autocrop) {
    gst_structure_remove_field (structure, "width");
    gst_structure_remove_field (structure, "height");
  } else {
    /* calculate width and height */
    if (gst_structure_get_int (structure, "width", &width)) {
      if (direction == GST_PAD_SINK) {
        width -= video_box->box_left;
        width -= video_box->box_right;
      } else {
        width += video_box->box_left;
        width += video_box->box_right;
      }
      if (width <= 0)
        width = 1;

      GST_DEBUG_OBJECT (trans, "New caps width: %d", width);
      gst_structure_set (structure, "width", G_TYPE_INT, width, NULL);
    }

    if (gst_structure_get_int (structure, "height", &height)) {
      if (direction == GST_PAD_SINK) {
        height -= video_box->box_top;
        height -= video_box->box_bottom;
      } else {
        height += video_box->box_top;
        height += video_box->box_bottom;
      }

      if (height <= 0)
        height = 1;

      GST_DEBUG_OBJECT (trans, "New caps height: %d", height);
      gst_structure_set (structure, "height", G_TYPE_INT, height, NULL);
    }
  }

  /* filter against set allowed caps on the pad */
  other = (direction == GST_PAD_SINK) ? trans->srcpad : trans->sinkpad;

  templ = gst_pad_get_pad_template_caps (other);
  ret = gst_caps_intersect (to, templ);
  gst_caps_unref (to);

  GST_DEBUG_OBJECT (video_box, "direction %d, transformed %" GST_PTR_FORMAT
      " to %" GST_PTR_FORMAT, direction, from, ret);

  return ret;
}

static gboolean
gst_video_box_recalc_transform (GstVideoBox * video_box)
{
  gboolean res = TRUE;

  /* if we have the same format in and out and we don't need to perform any
   * cropping at all, we can just operate in passthrough mode */
  if (video_box->in_format == video_box->out_format &&
      video_box->box_left == 0 && video_box->box_right == 0 &&
      video_box->box_top == 0 && video_box->box_bottom == 0 &&
      video_box->in_sdtv == video_box->out_sdtv) {

    GST_LOG_OBJECT (video_box, "we are using passthrough");
    gst_base_transform_set_passthrough (GST_BASE_TRANSFORM_CAST (video_box),
        TRUE);
  } else {
    GST_LOG_OBJECT (video_box, "we are not using passthrough");
    gst_base_transform_set_passthrough (GST_BASE_TRANSFORM_CAST (video_box),
        FALSE);
  }
  return res;
}

static gboolean
gst_video_box_select_processing_functions (GstVideoBox * video_box)
{
  switch (video_box->out_format) {
    case GST_VIDEO_FORMAT_AYUV:
      video_box->fill = fill_ayuv;
      switch (video_box->in_format) {
        case GST_VIDEO_FORMAT_AYUV:
          video_box->copy = copy_ayuv_ayuv;
          break;
        case GST_VIDEO_FORMAT_I420:
          video_box->copy = copy_i420_ayuv;
          break;
        default:
          break;
      }
      break;
    case GST_VIDEO_FORMAT_I420:
      video_box->fill = fill_i420;
      switch (video_box->in_format) {
        case GST_VIDEO_FORMAT_AYUV:
          video_box->copy = copy_ayuv_i420;
          break;
        case GST_VIDEO_FORMAT_I420:
          video_box->copy = copy_i420_i420;
          break;
        default:
          break;
      }
      break;
    default:
      break;
  }

  return video_box->fill != NULL && video_box->copy != NULL;
}

static gboolean
gst_video_box_set_caps (GstBaseTransform * trans, GstCaps * in, GstCaps * out)
{
  GstVideoBox *video_box = GST_VIDEO_BOX (trans);
  gboolean ret;
  const gchar *matrix;

  g_mutex_lock (video_box->mutex);

  ret =
      gst_video_format_parse_caps (in, &video_box->in_format,
      &video_box->in_width, &video_box->in_height);
  ret &=
      gst_video_format_parse_caps (out, &video_box->out_format,
      &video_box->out_width, &video_box->out_height);

  matrix = gst_video_parse_caps_color_matrix (in);
  video_box->in_sdtv = matrix ? g_str_equal (matrix, "sdtv") : TRUE;
  matrix = gst_video_parse_caps_color_matrix (out);
  video_box->out_sdtv = matrix ? g_str_equal (matrix, "sdtv") : TRUE;

  /* something wrong getting the caps */
  if (!ret)
    goto no_caps;

  GST_DEBUG_OBJECT (trans, "Input w: %d h: %d", video_box->in_width,
      video_box->in_height);
  GST_DEBUG_OBJECT (trans, "Output w: %d h: %d", video_box->out_width,
      video_box->out_height);

  if (video_box->autocrop)
    gst_video_box_autocrop (video_box);

  /* recalc the transformation strategy */
  ret = gst_video_box_recalc_transform (video_box);

  if (ret)
    ret = gst_video_box_select_processing_functions (video_box);
  g_mutex_unlock (video_box->mutex);

  return ret;

  /* ERRORS */
no_caps:
  {
    GST_DEBUG_OBJECT (video_box,
        "Invalid caps: %" GST_PTR_FORMAT " -> %" GST_PTR_FORMAT, in, out);
    g_mutex_unlock (video_box->mutex);
    return FALSE;
  }
}

static gboolean
gst_video_box_get_unit_size (GstBaseTransform * trans, GstCaps * caps,
    guint * size)
{
  GstVideoBox *video_box = GST_VIDEO_BOX (trans);
  GstVideoFormat format;
  gint width, height;
  gboolean ret;

  g_assert (size);

  ret = gst_video_format_parse_caps (caps, &format, &width, &height);
  if (!ret) {
    GST_ERROR_OBJECT (video_box, "Invalid caps: %" GST_PTR_FORMAT, caps);
    return FALSE;
  }

  *size = gst_video_format_get_size (format, width, height);

  GST_LOG_OBJECT (video_box, "Returning from _unit_size %d", *size);

  return TRUE;
}

static void
gst_video_box_fixate_caps (GstBaseTransform * trans,
    GstPadDirection direction, GstCaps * caps, GstCaps * othercaps)
{
  gint width, height;
  GstStructure *s;
  gboolean ret;

  ret = gst_video_format_parse_caps (caps, NULL, &width, &height);
  if (!ret)
    return;

  s = gst_caps_get_structure (othercaps, 0);
  gst_structure_fixate_field_nearest_int (s, "width", width);
  gst_structure_fixate_field_nearest_int (s, "height", height);
}

static void
gst_video_box_process (GstVideoBox * video_box, const guint8 * src,
    guint8 * dest)
{
  guint b_alpha = CLAMP ((guint) video_box->border_alpha * 256, 0, 256);
  guint i_alpha = CLAMP ((guint) video_box->alpha * 256, 0, 256);
  GstVideoBoxFill fill_type = video_box->fill_type;
  gint br, bl, bt, bb, crop_w, crop_h;

  crop_h = 0;
  crop_w = 0;

  br = video_box->box_right;
  bl = video_box->box_left;
  bt = video_box->box_top;
  bb = video_box->box_bottom;

  if (br >= 0 && bl >= 0) {
    crop_w = video_box->in_width - (br + bl);
  } else if (br >= 0 && bl < 0) {
    crop_w = video_box->in_width - (br);
  } else if (br < 0 && bl >= 0) {
    crop_w = video_box->in_width - (bl);
  } else if (br < 0 && bl < 0) {
    crop_w = video_box->in_width;
  }

  if (bb >= 0 && bt >= 0) {
    crop_h = video_box->in_height - (bb + bt);
  } else if (bb >= 0 && bt < 0) {
    crop_h = video_box->in_height - (bb);
  } else if (bb < 0 && bt >= 0) {
    crop_h = video_box->in_height - (bt);
  } else if (bb < 0 && bt < 0) {
    crop_h = video_box->in_height;
  }

  GST_DEBUG_OBJECT (video_box, "Borders are: L:%d, R:%d, T:%d, B:%d", bl, br,
      bt, bb);
  GST_DEBUG_OBJECT (video_box, "Alpha value is: %u (frame) %u (border)",
      i_alpha, b_alpha);

  if (crop_h < 0 || crop_w < 0) {
    video_box->fill (fill_type, b_alpha, dest, video_box->out_sdtv,
        video_box->out_width, video_box->out_height);
  } else if (bb == 0 && bt == 0 && br == 0 && bl == 0) {
    video_box->copy (i_alpha, dest, video_box->out_sdtv, video_box->out_width,
        video_box->out_height, 0, 0, src, video_box->in_sdtv,
        video_box->in_width, video_box->in_height, 0, 0, crop_w, crop_h);
  } else {
    gint src_x = 0, src_y = 0;
    gint dest_x = 0, dest_y = 0;

    /* Fill everything if a border should be added somewhere */
    if (bt < 0 || bb < 0 || br < 0 || bl < 0)
      video_box->fill (fill_type, b_alpha, dest, video_box->out_sdtv,
          video_box->out_width, video_box->out_height);

    /* Top border */
    if (bt < 0) {
      dest_y += -bt;
    } else {
      src_y += bt;
    }

    /* Left border */
    if (bl < 0) {
      dest_x += -bl;
    } else {
      src_x += bl;
    }

    /* Frame */
    video_box->copy (i_alpha, dest, video_box->out_sdtv, video_box->out_width,
        video_box->out_height, dest_x, dest_y, src, video_box->in_sdtv,
        video_box->in_width, video_box->in_height, src_x, src_y, crop_w,
        crop_h);
  }

  GST_LOG_OBJECT (video_box, "image created");
}

static GstFlowReturn
gst_video_box_transform (GstBaseTransform * trans, GstBuffer * in,
    GstBuffer * out)
{
  GstVideoBox *video_box = GST_VIDEO_BOX (trans);
  const guint8 *indata;
  guint8 *outdata;
  GstClockTime timestamp, stream_time;

  timestamp = GST_BUFFER_TIMESTAMP (in);
  stream_time =
      gst_segment_to_stream_time (&trans->segment, GST_FORMAT_TIME, timestamp);

  GST_DEBUG_OBJECT (video_box, "sync to %" GST_TIME_FORMAT,
      GST_TIME_ARGS (timestamp));

  if (GST_CLOCK_TIME_IS_VALID (stream_time))
    gst_object_sync_values (G_OBJECT (video_box), stream_time);

  indata = GST_BUFFER_DATA (in);
  outdata = GST_BUFFER_DATA (out);

  g_mutex_lock (video_box->mutex);
  gst_video_box_process (video_box, indata, outdata);
  g_mutex_unlock (video_box->mutex);
  return GST_FLOW_OK;
}

/* FIXME: 0.11 merge with videocrop plugin */
static gboolean
plugin_init (GstPlugin * plugin)
{
  oil_init ();

  gst_controller_init (NULL, NULL);

  GST_DEBUG_CATEGORY_INIT (videobox_debug, "videobox", 0,
      "Resizes a video by adding borders or cropping");

  return gst_element_register (plugin, "videobox", GST_RANK_NONE,
      GST_TYPE_VIDEO_BOX);
}

GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
    GST_VERSION_MINOR,
    "videobox",
    "resizes a video by adding borders or cropping",
    plugin_init, VERSION, GST_LICENSE, GST_PACKAGE_NAME, GST_PACKAGE_ORIGIN)