gstvideobox.c 50.6 KB
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/* GStreamer
 * Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
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 * Copyright (C) <2010> Sebastian Dröge <sebastian.droege@collabora.co.uk>
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 *
 * 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.
 */
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/**
 * 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..
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 *
 * 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
 * ]|
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 */
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#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
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#include "gstvideobox.h"

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

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#include <gst/controller/gstcontroller.h>

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GST_DEBUG_CATEGORY_STATIC (videobox_debug);
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#define GST_CAT_DEFAULT videobox_debug

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/* 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
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fill_ayuv (GstVideoBoxFill fill_type, guint b_alpha, GstVideoFormat format,
    guint8 * dest, gboolean sdtv, gint width, gint height)
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{
  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]);

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

static void
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copy_ayuv_ayuv (guint i_alpha, GstVideoFormat dest_format, guint8 * dest,
    gboolean dest_sdtv, gint dest_width, gint dest_height, gint dest_x,
    gint dest_y, GstVideoFormat src_format, const guint8 * src,
    gboolean src_sdtv, gint src_width, gint src_height, gint src_x, gint src_y,
    gint w, gint h)
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{
  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
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copy_ayuv_i420 (guint i_alpha, GstVideoFormat dest_format, guint8 * dest,
    gboolean dest_sdtv, gint dest_width, gint dest_height, gint dest_x,
    gint dest_y, GstVideoFormat src_format, const guint8 * src,
    gboolean src_sdtv, gint src_width, gint src_height, gint src_x, gint src_y,
    gint w, gint h)
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{
  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;
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  widthUV = w / 2;
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  hY = h;
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  hUV = h / 2;
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  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
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fill_i420 (GstVideoBoxFill fill_type, guint b_alpha, GstVideoFormat format,
    guint8 * dest, gboolean sdtv, gint width, gint height)
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{
  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);

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  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);
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}

static void
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copy_i420_i420 (guint i_alpha, GstVideoFormat dest_format, guint8 * dest,
    gboolean dest_sdtv, gint dest_width, gint dest_height, gint dest_x,
    gint dest_y, GstVideoFormat src_format, const guint8 * src,
    gboolean src_sdtv, gint src_width, gint src_height, gint src_x, gint src_y,
    gint w, gint h)
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{
  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
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copy_i420_ayuv (guint i_alpha, GstVideoFormat dest_format, guint8 * dest,
    gboolean dest_sdtv, gint dest_width, gint dest_height, gint dest_x,
    gint dest_y, GstVideoFormat src_format, const guint8 * src,
    gboolean src_sdtv, gint src_width, gint src_height, gint src_x, gint src_y,
    gint w, gint h)
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{
  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;
    }
  }
}

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static void
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_argb_order (GstVideoFormat format, gint p[4], gboolean * alpha)
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{
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  *alpha = FALSE;
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  switch (format) {
    case GST_VIDEO_FORMAT_ARGB:
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      *alpha = TRUE;
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    case GST_VIDEO_FORMAT_xRGB:
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      p[0] = 0;
      p[1] = 1;
      p[2] = 2;
      p[3] = 3;
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      break;
    case GST_VIDEO_FORMAT_ABGR:
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      *alpha = TRUE;
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    case GST_VIDEO_FORMAT_xBGR:
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      p[0] = 0;
      p[1] = 3;
      p[2] = 2;
      p[3] = 1;
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      break;
    case GST_VIDEO_FORMAT_RGBA:
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      *alpha = TRUE;
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    case GST_VIDEO_FORMAT_RGBx:
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    case GST_VIDEO_FORMAT_RGB:
      p[0] = 3;
      p[1] = 0;
      p[2] = 1;
      p[3] = 2;
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      break;
    case GST_VIDEO_FORMAT_BGRA:
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      *alpha = TRUE;
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    case GST_VIDEO_FORMAT_BGRx:
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    case GST_VIDEO_FORMAT_BGR:
      p[0] = 3;
      p[1] = 2;
      p[2] = 1;
      p[3] = 0;
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      break;
    default:
      g_assert_not_reached ();
  }
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}

static void
fill_rgb32 (GstVideoBoxFill fill_type, guint b_alpha, GstVideoFormat format,
    guint8 * dest, gboolean sdtv, gint width, gint height)
{
  guint32 empty_pixel;
  gint p[4];
  gboolean alpha;
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  _argb_order (format, p, &alpha);

  empty_pixel = GUINT32_FROM_BE ((b_alpha << (p[0] * 8)) |
      (rgb_colors_R[fill_type] << (p[1] * 8)) |
      (rgb_colors_G[fill_type] << (p[2] * 8)) |
      (rgb_colors_B[fill_type] << (p[3] * 8)));
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  oil_splat_u32_ns ((guint32 *) dest, &empty_pixel, width * height);
}

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static void
fill_rgb24 (GstVideoBoxFill fill_type, guint b_alpha, GstVideoFormat format,
    guint8 * dest, gboolean sdtv, gint width, gint height)
{
  gint dest_stride = GST_ROUND_UP_4 (width * 3);
  gint p[4];
  gboolean alpha;
  gint i, j;

  _argb_order (format, p, &alpha);

  for (i = 0; i < height; i++) {
    for (j = 0; j < width; j++) {
      dest[3 * j + p[0]] = rgb_colors_R[fill_type];
      dest[3 * j + p[1]] = rgb_colors_G[fill_type];
      dest[3 * j + p[2]] = rgb_colors_B[fill_type];
    }
    dest += dest_stride;
  }
}

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static void
copy_rgb32 (guint i_alpha, GstVideoFormat dest_format, guint8 * dest,
    gboolean dest_sdtv, gint dest_width, gint dest_height, gint dest_x,
    gint dest_y, GstVideoFormat src_format, 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;
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  gint src_stride, dest_stride;
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  gboolean in_alpha, out_alpha;
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  gint in_bpp, out_bpp;
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  gint p_out[4];
  gint p_in[4];
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  gboolean packed_out = (dest_format == GST_VIDEO_FORMAT_RGB
      || dest_format == GST_VIDEO_FORMAT_BGR);
  gboolean packed_in = (src_format == GST_VIDEO_FORMAT_RGB
      || src_format == GST_VIDEO_FORMAT_BGR);
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  src_stride = (packed_in) ? GST_ROUND_UP_4 (3 * src_width) : 4 * src_width;
  dest_stride = (packed_out) ? GST_ROUND_UP_4 (3 * dest_width) : 4 * dest_width;
  in_bpp = (packed_in) ? 3 : 4;
  out_bpp = (packed_out) ? 3 : 4;
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  _argb_order (dest_format, p_out, &out_alpha);
  _argb_order (src_format, p_in, &in_alpha);
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  dest = dest + dest_y * dest_stride + dest_x * out_bpp;
  src = src + src_y * src_stride + src_x * in_bpp;
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  if (in_alpha && out_alpha) {
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    w *= 4;
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    for (i = 0; i < h; i++) {
      for (j = 0; j < w; j += 4) {
        dest[j + p_out[0]] = (src[j + p_in[0]] * i_alpha) >> 8;
        dest[j + p_out[1]] = src[j + p_in[1]];
        dest[j + p_out[2]] = src[j + p_in[2]];
        dest[j + p_out[3]] = src[j + p_in[3]];
      }
      dest += dest_stride;
      src += src_stride;
    }
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  } else if (out_alpha && !packed_in) {
    w *= 4;
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    for (i = 0; i < h; i++) {
      for (j = 0; j < w; j += 4) {
        dest[j + p_out[0]] = i_alpha & 0xff;
        dest[j + p_out[1]] = src[j + p_in[1]];
        dest[j + p_out[2]] = src[j + p_in[2]];
        dest[j + p_out[3]] = src[j + p_in[3]];
      }
      dest += dest_stride;
      src += src_stride;
    }
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  } else if (!packed_out && !packed_in) {
    w *= 4;
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    for (i = 0; i < h; i++) {
      for (j = 0; j < w; j += 4) {
        dest[j + p_out[1]] = src[j + p_in[1]];
        dest[j + p_out[2]] = src[j + p_in[2]];
        dest[j + p_out[3]] = src[j + p_in[3]];
      }
      dest += dest_stride;
      src += src_stride;
    }
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  } else {
    for (i = 0; i < h; i++) {
      for (j = 0; j < w; j++) {
        dest[out_bpp * j + p_out[1]] = src[in_bpp * j + p_in[1]];
        dest[out_bpp * j + p_out[2]] = src[in_bpp * j + p_in[2]];
        dest[out_bpp * j + p_out[3]] = src[in_bpp * j + p_in[3]];
      }
      dest += dest_stride;
      src += src_stride;
    }
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  }
}

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

static GstStaticPadTemplate gst_video_box_src_template =
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    GST_STATIC_PAD_TEMPLATE ("src",
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    GST_PAD_SRC,
    GST_PAD_ALWAYS,
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    GST_STATIC_CAPS (GST_VIDEO_CAPS_YUV ("AYUV") ";"
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        GST_VIDEO_CAPS_YUV ("I420") ";"
        GST_VIDEO_CAPS_xRGB ";" GST_VIDEO_CAPS_BGRx ";"
        GST_VIDEO_CAPS_xBGR ";" GST_VIDEO_CAPS_RGBx ";"
        GST_VIDEO_CAPS_ARGB ";" GST_VIDEO_CAPS_BGRA ";"
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        GST_VIDEO_CAPS_ABGR ";" GST_VIDEO_CAPS_RGBA ";"
        GST_VIDEO_CAPS_RGB ";" GST_VIDEO_CAPS_BGR)
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    );

static GstStaticPadTemplate gst_video_box_sink_template =
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    GST_STATIC_PAD_TEMPLATE ("sink",
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    GST_PAD_SINK,
    GST_PAD_ALWAYS,
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    GST_STATIC_CAPS (GST_VIDEO_CAPS_YUV ("AYUV") ";"
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        GST_VIDEO_CAPS_YUV ("I420") ";"
        GST_VIDEO_CAPS_xRGB ";" GST_VIDEO_CAPS_BGRx ";"
        GST_VIDEO_CAPS_xBGR ";" GST_VIDEO_CAPS_RGBx ";"
        GST_VIDEO_CAPS_ARGB ";" GST_VIDEO_CAPS_BGRA ";"
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        GST_VIDEO_CAPS_ABGR ";" GST_VIDEO_CAPS_RGBA ";"
        GST_VIDEO_CAPS_RGB ";" GST_VIDEO_CAPS_BGR)
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    );

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GST_BOILERPLATE (GstVideoBox, gst_video_box, GstBaseTransform,
    GST_TYPE_BASE_TRANSFORM);
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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);

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static gboolean gst_video_box_recalc_transform (GstVideoBox * video_box);
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static GstCaps *gst_video_box_transform_caps (GstBaseTransform * trans,
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    GstPadDirection direction, GstCaps * from);
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static gboolean gst_video_box_set_caps (GstBaseTransform * trans,
    GstCaps * in, GstCaps * out);
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static gboolean gst_video_box_get_unit_size (GstBaseTransform * trans,
    GstCaps * caps, guint * size);
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static GstFlowReturn gst_video_box_transform (GstBaseTransform * trans,
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    GstBuffer * in, GstBuffer * out);
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static void gst_video_box_fixate_caps (GstBaseTransform * trans,
    GstPadDirection direction, GstCaps * caps, GstCaps * othercaps);
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#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;
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  static const GEnumValue video_box_fill[] = {
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    {VIDEO_BOX_FILL_BLACK, "Black", "black"},
    {VIDEO_BOX_FILL_GREEN, "Colorkey green", "green"},
    {VIDEO_BOX_FILL_BLUE, "Colorkey blue", "blue"},
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    {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);

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  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>");
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  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));
}
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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);
}

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

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

static void
gst_video_box_set_property (GObject * object, guint prop_id,
    const GValue * value, GParamSpec * pspec)
{
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  GstVideoBox *video_box = GST_VIDEO_BOX (object);
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  g_mutex_lock (video_box->mutex);
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  switch (prop_id) {
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    case PROP_LEFT:
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      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;
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    case PROP_RIGHT:
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      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;
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    case PROP_TOP:
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      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;
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    case PROP_BOTTOM:
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      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;
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    case PROP_FILL_TYPE:
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      video_box->fill_type = g_value_get_enum (value);
      break;
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    case PROP_ALPHA:
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      video_box->alpha = g_value_get_double (value);
      break;
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    case PROP_BORDER_ALPHA:
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      video_box->border_alpha = g_value_get_double (value);
      break;
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    case PROP_AUTOCROP:
      video_box->autocrop = g_value_get_boolean (value);
      break;
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    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
      break;
  }
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  gst_video_box_recalc_transform (video_box);
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  GST_DEBUG_OBJECT (video_box, "Calling reconfigure");
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  gst_base_transform_reconfigure (GST_BASE_TRANSFORM_CAST (video_box));
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  g_mutex_unlock (video_box->mutex);
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}

static void
gst_video_box_autocrop (GstVideoBox * video_box)
{
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  gint crop_w = video_box->in_width - video_box->out_width;
  gint crop_h = video_box->in_height - video_box->out_height;
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  video_box->box_left = crop_w / 2;
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  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;
  }

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  /* 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;
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  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;
  }

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  video_box->box_top = crop_h / 2;
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  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;
  }

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  /* 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;

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  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;
  }
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}
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static void
gst_video_box_get_property (GObject * object, guint prop_id, GValue * value,
    GParamSpec * pspec)
{
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  GstVideoBox *video_box = GST_VIDEO_BOX (object);
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  switch (prop_id) {
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    case PROP_LEFT:
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      g_value_set_int (value, video_box->box_left);
      break;
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    case PROP_RIGHT:
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      g_value_set_int (value, video_box->box_right);
      break;
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    case PROP_TOP:
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      g_value_set_int (value, video_box->box_top);
      break;
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    case PROP_BOTTOM:
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      g_value_set_int (value, video_box->box_bottom);
      break;
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    case PROP_FILL_TYPE:
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      g_value_set_enum (value, video_box->fill_type);
      break;
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    case PROP_ALPHA:
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      g_value_set_double (value, video_box->alpha);
      break;
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    case PROP_BORDER_ALPHA:
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      g_value_set_double (value, video_box->border_alpha);
      break;
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    case PROP_AUTOCROP:
      g_value_set_boolean (value, video_box->autocrop);
      break;
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    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
      break;
  }
}

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static GstCaps *
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gst_video_box_transform_caps (GstBaseTransform * trans,
    GstPadDirection direction, GstCaps * from)
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{
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  GstVideoBox *video_box = GST_VIDEO_BOX (trans);
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  GstCaps *to, *ret;
  const GstCaps *templ;
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  const gchar *name;
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  GstStructure *structure;
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  GstPad *other;
  gint width, height;
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  to = gst_caps_copy (from);
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  structure = gst_caps_get_structure (to, 0);

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  /* For I420/AYUV we support conversion, for all
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   * 24/32bpp RGBs we support conversion and for
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   * everything else we only support passthrough
   */
  name = gst_structure_get_name (structure);
  if (g_str_equal (name, "video/x-raw-yuv")) {
    guint32 fourcc;

    if (gst_structure_get_fourcc (structure, "format", &fourcc) &&
        (fourcc == GST_STR_FOURCC ("AYUV") ||
            fourcc == GST_STR_FOURCC ("I420"))) {
      GValue list = { 0, };
      GValue val = { 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");

      g_value_init (&list, GST_TYPE_LIST);
      g_value_init (&val, GST_TYPE_FOURCC);
      gst_value_set_fourcc (&val, GST_STR_FOURCC ("AYUV"));
      gst_value_list_append_value (&list, &val);
      g_value_reset (&val);
      gst_value_set_fourcc (&val, GST_STR_FOURCC ("I420"));
      gst_value_list_append_value (&list, &val);
      g_value_reset (&val);
      gst_structure_set_value (structure, "format", &list);
      g_value_unset (&list);
    }
  } else if (g_str_equal (name, "video/x-raw-rgb")) {
    gint bpp;

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    if (gst_structure_get_int (structure, "bpp", &bpp) &&
        (bpp == 32 || bpp == 24)) {
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      GValue list = { 0, };
      GValue val = { 0, };

      /* get rid of format */
      gst_structure_remove_field (structure, "depth");
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      gst_structure_remove_field (structure, "bpp");
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      gst_structure_remove_field (structure, "red_mask");
      gst_structure_remove_field (structure, "green_mask");
      gst_structure_remove_field (structure, "blue_mask");
      gst_structure_remove_field (structure, "alpha_mask");

      g_value_init (&list, GST_TYPE_LIST);
      g_value_init (&val, G_TYPE_INT);
      g_value_set_int (&val, 32);
      gst_value_list_append_value (&list, &val);
      g_value_reset (&val);
      g_value_set_int (&val, 24);
      gst_value_list_append_value (&list, &val);
      g_value_reset (&val);
      gst_structure_set_value (structure, "depth", &list);
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      gst_structure_set_value (structure, "bpp", &list);
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      g_value_unset (&list);
    }
  }
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  /* otherwise caps nego will fail: */
  if (video_box->autocrop) {
    gst_structure_remove_field (structure, "width");
    gst_structure_remove_field (structure, "height");
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  } else {
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    /* 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);
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    }
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    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;
      }
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      if (height <= 0)
        height = 1;

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

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

  return ret;
}

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static gboolean
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gst_video_box_recalc_transform (GstVideoBox * video_box)