C++ GST_VIDEO_FRAME_PLANE_STRIDE函数代码示例

static void
gst_video_crop_transform_packed_simple (GstVideoCrop * vcrop,
    GstVideoFrame * in_frame, GstVideoFrame * out_frame)
{
  guint8 *in_data, *out_data;
  gint width, height;
  guint i, dx;
  gint in_stride, out_stride;

  width = GST_VIDEO_FRAME_WIDTH (out_frame);
  height = GST_VIDEO_FRAME_HEIGHT (out_frame);

  in_data = GST_VIDEO_FRAME_PLANE_DATA (in_frame, 0);
  out_data = GST_VIDEO_FRAME_PLANE_DATA (out_frame, 0);

  in_stride = GST_VIDEO_FRAME_PLANE_STRIDE (in_frame, 0);
  out_stride = GST_VIDEO_FRAME_PLANE_STRIDE (out_frame, 0);

  in_data += vcrop->crop_top * in_stride;
  in_data += vcrop->crop_left * GST_VIDEO_FRAME_COMP_PSTRIDE (in_frame, 0);

  dx = width * GST_VIDEO_FRAME_COMP_PSTRIDE (out_frame, 0);

  for (i = 0; i < height; ++i) {
    memcpy (out_data, in_data, dx);
    in_data += in_stride;
    out_data += out_stride;
  }
}

/* this function does the actual processing
 */
static GstFlowReturn
gst_yuv_to_rgb_transform_frame (GstVideoFilter *filter, GstVideoFrame *in_frame, GstVideoFrame *out_frame)
{
  GstYuvToRgb *rgbtoyuv = GST_YUVTORGB_CAST (filter);
  gint width, height, stride;
  gint y_stride, uv_stride;
  guint32 *out_data;
  guint8 *y_in, *u_in, *v_in;

  y_stride = GST_VIDEO_FRAME_PLANE_STRIDE (in_frame, 0);
  uv_stride = GST_VIDEO_FRAME_PLANE_STRIDE (in_frame, 1);

  y_in = (guint8*) GST_VIDEO_FRAME_PLANE_DATA (in_frame, 0);
  u_in = (guint8*) GST_VIDEO_FRAME_PLANE_DATA (in_frame, 1);
  v_in = (guint8*) GST_VIDEO_FRAME_PLANE_DATA (in_frame, 2);

  width = GST_VIDEO_FRAME_WIDTH (out_frame);
  height = GST_VIDEO_FRAME_HEIGHT (out_frame);
  stride = GST_VIDEO_FRAME_PLANE_STRIDE (out_frame, 0);

  out_data = (guint32*) GST_VIDEO_FRAME_PLANE_DATA (out_frame, 0);

  // GST_INFO ("DEBUG_INFO: rgbtoyuv::transform_frame: ");
  // GST_INFO ("in stride: %d; out stride: %d %d\n", stride, y_stride, uv_stride);

  libyuv::I420ToARGB (y_in, y_stride,
              u_in, uv_stride,
              v_in, uv_stride,
              (guint8*)out_data, stride,
              width, height);

  return GST_FLOW_OK;
}

static void
copy_field (GstInterlace * interlace, GstBuffer * dest, GstBuffer * src,
    int field_index)
{
  GstVideoInfo *info = &interlace->info;
  gint i, j, n_planes;
  guint8 *d, *s;
  GstVideoFrame dframe, sframe;

  if (!gst_video_frame_map (&dframe, info, dest, GST_MAP_WRITE))
    goto dest_map_failed;

  if (!gst_video_frame_map (&sframe, info, src, GST_MAP_READ))
    goto src_map_failed;

  n_planes = GST_VIDEO_FRAME_N_PLANES (&dframe);

  for (i = 0; i < n_planes; i++) {
    gint cheight, cwidth;
    gint ss, ds;

    d = GST_VIDEO_FRAME_PLANE_DATA (&dframe, i);
    s = GST_VIDEO_FRAME_PLANE_DATA (&sframe, i);

    ds = GST_VIDEO_FRAME_PLANE_STRIDE (&dframe, i);
    ss = GST_VIDEO_FRAME_PLANE_STRIDE (&sframe, i);

    d += field_index * ds;
    s += field_index * ss;

    cheight = GST_VIDEO_FRAME_COMP_HEIGHT (&dframe, i);
    cwidth = MIN (ABS (ss), ABS (ds));

    for (j = field_index; j < cheight; j += 2) {
      memcpy (d, s, cwidth);
      d += ds * 2;
      s += ss * 2;
    }
  }

  gst_video_frame_unmap (&dframe);
  gst_video_frame_unmap (&sframe);
  return;

dest_map_failed:
  {
    GST_ERROR_OBJECT (interlace, "failed to map dest");
    return;
  }
src_map_failed:
  {
    GST_ERROR_OBJECT (interlace, "failed to map src");
    gst_video_frame_unmap (&dframe);
    return;
  }
}

static void
gst_video_balance_semiplanar_yuv (GstVideoBalance * videobalance,
    GstVideoFrame * frame)
{
  gint x, y;
  guint8 *ydata;
  guint8 *uvdata;
  gint ystride, uvstride;
  gint width, height;
  gint width2, height2;
  guint8 *tabley = videobalance->tabley;
  guint8 **tableu = videobalance->tableu;
  guint8 **tablev = videobalance->tablev;
  gint upos, vpos;

  width = GST_VIDEO_FRAME_WIDTH (frame);
  height = GST_VIDEO_FRAME_HEIGHT (frame);

  ydata = GST_VIDEO_FRAME_PLANE_DATA (frame, 0);
  ystride = GST_VIDEO_FRAME_PLANE_STRIDE (frame, 0);

  for (y = 0; y < height; y++) {
    guint8 *yptr;

    yptr = ydata + y * ystride;
    for (x = 0; x < width; x++) {
      *yptr = tabley[*yptr];
      yptr++;
    }
  }

  width2 = GST_VIDEO_FRAME_COMP_WIDTH (frame, 1);
  height2 = GST_VIDEO_FRAME_COMP_HEIGHT (frame, 1);

  uvdata = GST_VIDEO_FRAME_PLANE_DATA (frame, 1);
  uvstride = GST_VIDEO_FRAME_PLANE_STRIDE (frame, 1);

  upos = GST_VIDEO_INFO_FORMAT (&frame->info) == GST_VIDEO_FORMAT_NV12 ? 0 : 1;
  vpos = GST_VIDEO_INFO_FORMAT (&frame->info) == GST_VIDEO_FORMAT_NV12 ? 1 : 0;

  for (y = 0; y < height2; y++) {
    guint8 *uvptr;
    guint8 u1, v1;

    uvptr = uvdata + y * uvstride;

    for (x = 0; x < width2; x++) {
      u1 = uvptr[upos];
      v1 = uvptr[vpos];

      uvptr[upos] = tableu[u1][v1];
      uvptr[vpos] = tablev[u1][v1];
      uvptr += 2;
    }
  }
}

static void
gst_video_balance_planar_yuv (GstVideoBalance * videobalance,
    GstVideoFrame * frame)
{
  gint x, y;
  guint8 *ydata;
  guint8 *udata, *vdata;
  gint ystride, ustride, vstride;
  gint width, height;
  gint width2, height2;
  guint8 *tabley = videobalance->tabley;
  guint8 **tableu = videobalance->tableu;
  guint8 **tablev = videobalance->tablev;

  width = GST_VIDEO_FRAME_WIDTH (frame);
  height = GST_VIDEO_FRAME_HEIGHT (frame);

  ydata = GST_VIDEO_FRAME_PLANE_DATA (frame, 0);
  ystride = GST_VIDEO_FRAME_PLANE_STRIDE (frame, 0);

  for (y = 0; y < height; y++) {
    guint8 *yptr;

    yptr = ydata + y * ystride;
    for (x = 0; x < width; x++) {
      *yptr = tabley[*yptr];
      yptr++;
    }
  }

  width2 = GST_VIDEO_FRAME_COMP_WIDTH (frame, 1);
  height2 = GST_VIDEO_FRAME_COMP_HEIGHT (frame, 1);

  udata = GST_VIDEO_FRAME_PLANE_DATA (frame, 1);
  vdata = GST_VIDEO_FRAME_PLANE_DATA (frame, 2);
  ustride = GST_VIDEO_FRAME_PLANE_STRIDE (frame, 1);
  vstride = GST_VIDEO_FRAME_PLANE_STRIDE (frame, 2);

  for (y = 0; y < height2; y++) {
    guint8 *uptr, *vptr;
    guint8 u1, v1;

    uptr = udata + y * ustride;
    vptr = vdata + y * vstride;

    for (x = 0; x < width2; x++) {
      u1 = *uptr;
      v1 = *vptr;

      *uptr++ = tableu[u1][v1];
      *vptr++ = tablev[u1][v1];
    }
  }
}

static void
gst_video_crop_transform_packed_complex (GstVideoCrop * vcrop,
    GstVideoFrame * in_frame, GstVideoFrame * out_frame)
{
  guint8 *in_data, *out_data;
  guint i, dx;
  gint width, height;
  gint in_stride;
  gint out_stride;

  width = GST_VIDEO_FRAME_WIDTH (out_frame);
  height = GST_VIDEO_FRAME_HEIGHT (out_frame);

  in_data = GST_VIDEO_FRAME_PLANE_DATA (in_frame, 0);
  out_data = GST_VIDEO_FRAME_PLANE_DATA (out_frame, 0);

  in_stride = GST_VIDEO_FRAME_PLANE_STRIDE (in_frame, 0);
  out_stride = GST_VIDEO_FRAME_PLANE_STRIDE (out_frame, 0);

  in_data += vcrop->crop_top * in_stride;

  /* rounding down here so we end up at the start of a macro-pixel and not
   * in the middle of one */
  in_data += ROUND_DOWN_2 (vcrop->crop_left) *
      GST_VIDEO_FRAME_COMP_PSTRIDE (in_frame, 0);

  dx = width * GST_VIDEO_FRAME_COMP_PSTRIDE (out_frame, 0);

  /* UYVY = 4:2:2 - [U0 Y0 V0 Y1] [U2 Y2 V2 Y3] [U4 Y4 V4 Y5]
   * YUYV = 4:2:2 - [Y0 U0 Y1 V0] [Y2 U2 Y3 V2] [Y4 U4 Y5 V4] = YUY2 */
  if ((vcrop->crop_left % 2) != 0) {
    for (i = 0; i < height; ++i) {
      gint j;

      memcpy (out_data, in_data, dx);

      /* move just the Y samples one pixel to the left, don't worry about
       * chroma shift */
      for (j = vcrop->macro_y_off; j < out_stride - 2; j += 2)
        out_data[j] = in_data[j + 2];

      in_data += in_stride;
      out_data += out_stride;
    }
  } else {
    for (i = 0; i < height; ++i) {
      memcpy (out_data, in_data, dx);
      in_data += in_stride;
      out_data += out_stride;
    }
  }
}

/* Copy the frame data from the GstBuffer (from decoder)
 * to the picture obtained from downstream in VLC.
 * This function should be avoided as much
 * as possible, since it involves a complete frame copy. */
static void gst_CopyPicture( picture_t *p_pic, GstVideoFrame *p_frame )
{
    int i_plane, i_planes, i_line, i_dst_stride, i_src_stride;
    uint8_t *p_dst, *p_src;
    int i_w, i_h;

    i_planes = p_pic->i_planes;
    for( i_plane = 0; i_plane < i_planes; i_plane++ )
    {
        p_dst = p_pic->p[i_plane].p_pixels;
        p_src = GST_VIDEO_FRAME_PLANE_DATA( p_frame, i_plane );
        i_dst_stride = p_pic->p[i_plane].i_pitch;
        i_src_stride = GST_VIDEO_FRAME_PLANE_STRIDE( p_frame, i_plane );

        i_w = GST_VIDEO_FRAME_COMP_WIDTH( p_frame,
                i_plane ) * GST_VIDEO_FRAME_COMP_PSTRIDE( p_frame, i_plane );
        i_h = GST_VIDEO_FRAME_COMP_HEIGHT( p_frame, i_plane );

        for( i_line = 0;
                i_line < __MIN( p_pic->p[i_plane].i_lines, i_h );
                i_line++ )
        {
            memcpy( p_dst, p_src, i_w );
            p_src += i_src_stride;
            p_dst += i_dst_stride;
        }
    }
}

static GstFlowReturn
openni2_read_gstbuffer (GstOpenni2Src * src, GstBuffer * buf)
{
  openni::Status rc = openni::STATUS_OK;
  openni::VideoStream * pStream = src->depth;
  int changedStreamDummy;
  GstVideoFrame vframe;
  uint64_t oni_ts;

  /* Block until we get some data */
  rc = openni::OpenNI::waitForAnyStream (&pStream, 1, &changedStreamDummy,
      SAMPLE_READ_WAIT_TIMEOUT);
  if (rc != openni::STATUS_OK) {
    GST_ERROR_OBJECT (src, "Frame read timeout: %s",
        openni::OpenNI::getExtendedError ());
    return GST_FLOW_ERROR;
  }

  if (src->depth->isValid () && src->color->isValid () &&
      src->sourcetype == SOURCETYPE_BOTH) {
    rc = src->depth->readFrame (src->depthFrame);
    if (rc != openni::STATUS_OK) {
      GST_ERROR_OBJECT (src, "Frame read error: %s",
          openni::OpenNI::getExtendedError ());
      return GST_FLOW_ERROR;
    }
    rc = src->color->readFrame (src->colorFrame);
    if (rc != openni::STATUS_OK) {
      GST_ERROR_OBJECT (src, "Frame read error: %s",
          openni::OpenNI::getExtendedError ());
      return GST_FLOW_ERROR;
    }

    /* Copy colour information */
    gst_video_frame_map (&vframe, &src->info, buf, GST_MAP_WRITE);

    guint8 *pData = (guint8 *) GST_VIDEO_FRAME_PLANE_DATA (&vframe, 0);
    guint8 *pColor = (guint8 *) src->colorFrame->getData ();
    /* Add depth as 8bit alpha channel, depth is 16bit samples. */
    guint16 *pDepth = (guint16 *) src->depthFrame->getData ();

    for (int i = 0; i < src->colorFrame->getHeight (); ++i) {
      for (int j = 0; j < src->colorFrame->getWidth (); ++j) {
        pData[4 * j + 0] = pColor[3 * j + 0];
        pData[4 * j + 1] = pColor[3 * j + 1];
        pData[4 * j + 2] = pColor[3 * j + 2];
        pData[4 * j + 3] = pDepth[j] >> 8;
      }
      pData += GST_VIDEO_FRAME_PLANE_STRIDE (&vframe, 0);
      pColor += src->colorFrame->getStrideInBytes ();
      pDepth += src->depthFrame->getStrideInBytes () / 2;
    }
    gst_video_frame_unmap (&vframe);

    oni_ts = src->colorFrame->getTimestamp () * 1000;

    GST_LOG_OBJECT (src, "sending buffer (%d+%d)B",
        src->colorFrame->getDataSize (),
        src->depthFrame->getDataSize ());
  } else if (src->depth->isValid () && src->sourcetype == SOURCETYPE_DEPTH) {

static void
fill_image_planar8_3 (opj_image_t * image, GstVideoFrame * frame)
{
  gint c, x, y, w, h;
  const guint8 *data_in, *tmp;
  gint *data_out;
  gint sstride;

  for (c = 0; c < 3; c++) {
    w = GST_VIDEO_FRAME_COMP_WIDTH (frame, c);
    h = GST_VIDEO_FRAME_COMP_HEIGHT (frame, c);
    data_in = GST_VIDEO_FRAME_COMP_DATA (frame, c);
    sstride = GST_VIDEO_FRAME_PLANE_STRIDE (frame, c);
    data_out = image->comps[c].data;

    for (y = 0; y < h; y++) {
      tmp = data_in;
      for (x = 0; x < w; x++) {
        *data_out = *tmp;
        data_out++;
        tmp++;
      }
      data_in += sstride;
    }
  }
}

static void
fill_frame_planar16_1 (GstVideoFrame * frame, opj_image_t * image)
{
  gint x, y, w, h;
  guint16 *data_out, *tmp;
  const gint *data_in;
  gint dstride;
  gint shift;

  w = GST_VIDEO_FRAME_WIDTH (frame);
  h = GST_VIDEO_FRAME_HEIGHT (frame);
  data_out = GST_VIDEO_FRAME_PLANE_DATA (frame, 0);
  dstride = GST_VIDEO_FRAME_PLANE_STRIDE (frame, 0) / 2;

  data_in = image->comps[0].data;

  shift = 16 - image->comps[0].prec;

  for (y = 0; y < h; y++) {
    tmp = data_out;

    for (x = 0; x < w; x++) {
      *tmp = *data_in << shift;

      tmp++;
      data_in++;
    }
    data_out += dstride;
  }
}

static void
fill_frame_packed8_3 (GstVideoFrame * frame, opj_image_t * image)
{
  gint x, y, w, h;
  guint8 *data_out, *tmp;
  const gint *data_in[3];
  gint dstride;

  w = GST_VIDEO_FRAME_WIDTH (frame);
  h = GST_VIDEO_FRAME_HEIGHT (frame);
  data_out = GST_VIDEO_FRAME_PLANE_DATA (frame, 0);
  dstride = GST_VIDEO_FRAME_PLANE_STRIDE (frame, 0);

  data_in[0] = image->comps[0].data;
  data_in[1] = image->comps[1].data;
  data_in[2] = image->comps[2].data;

  for (y = 0; y < h; y++) {
    tmp = data_out;

    for (x = 0; x < w; x++) {
      tmp[1] = *data_in[0];
      tmp[2] = *data_in[1];
      tmp[3] = *data_in[2];

      tmp += 4;
      data_in[0]++;
      data_in[1]++;
      data_in[2]++;
    }
    data_out += dstride;
  }
}

static void
fill_image_packed8_3 (opj_image_t * image, GstVideoFrame * frame)
{
  gint x, y, w, h;
  const guint8 *data_in, *tmp;
  gint *data_out[3];
  gint sstride;

  w = GST_VIDEO_FRAME_WIDTH (frame);
  h = GST_VIDEO_FRAME_HEIGHT (frame);
  data_in = GST_VIDEO_FRAME_PLANE_DATA (frame, 0);
  sstride = GST_VIDEO_FRAME_PLANE_STRIDE (frame, 0);

  data_out[0] = image->comps[0].data;
  data_out[1] = image->comps[1].data;
  data_out[2] = image->comps[2].data;

  for (y = 0; y < h; y++) {
    tmp = data_in;

    for (x = 0; x < w; x++) {
      *data_out[0] = tmp[1];
      *data_out[1] = tmp[2];
      *data_out[2] = tmp[3];

      tmp += 4;
      data_out[0]++;
      data_out[1]++;
      data_out[2]++;
    }
    data_in += sstride;
  }
}

static void
gst_video_balance_packed_rgb (GstVideoBalance * videobalance,
    GstVideoFrame * frame)
{
  gint i, j, height;
  gint width, stride, row_wrap;
  gint pixel_stride;
  guint8 *data;
  gint offsets[3];
  gint r, g, b;
  gint y, u, v;
  gint u_tmp, v_tmp;
  guint8 *tabley = videobalance->tabley;
  guint8 **tableu = videobalance->tableu;
  guint8 **tablev = videobalance->tablev;

  width = GST_VIDEO_FRAME_WIDTH (frame);
  height = GST_VIDEO_FRAME_HEIGHT (frame);

  offsets[0] = GST_VIDEO_FRAME_COMP_OFFSET (frame, 0);
  offsets[1] = GST_VIDEO_FRAME_COMP_OFFSET (frame, 1);
  offsets[2] = GST_VIDEO_FRAME_COMP_OFFSET (frame, 2);

  data = GST_VIDEO_FRAME_PLANE_DATA (frame, 0);
  stride = GST_VIDEO_FRAME_PLANE_STRIDE (frame, 0);

  pixel_stride = GST_VIDEO_FRAME_COMP_PSTRIDE (frame, 0);
  row_wrap = stride - pixel_stride * width;

  for (i = 0; i < height; i++) {
    for (j = 0; j < width; j++) {
      r = data[offsets[0]];
      g = data[offsets[1]];
      b = data[offsets[2]];

      y = APPLY_MATRIX (cog_rgb_to_ycbcr_matrix_8bit_sdtv, 0, r, g, b);
      u_tmp = APPLY_MATRIX (cog_rgb_to_ycbcr_matrix_8bit_sdtv, 1, r, g, b);
      v_tmp = APPLY_MATRIX (cog_rgb_to_ycbcr_matrix_8bit_sdtv, 2, r, g, b);

      y = CLAMP (y, 0, 255);
      u_tmp = CLAMP (u_tmp, 0, 255);
      v_tmp = CLAMP (v_tmp, 0, 255);

      y = tabley[y];
      u = tableu[u_tmp][v_tmp];
      v = tablev[u_tmp][v_tmp];

      r = APPLY_MATRIX (cog_ycbcr_to_rgb_matrix_8bit_sdtv, 0, y, u, v);
      g = APPLY_MATRIX (cog_ycbcr_to_rgb_matrix_8bit_sdtv, 1, y, u, v);
      b = APPLY_MATRIX (cog_ycbcr_to_rgb_matrix_8bit_sdtv, 2, y, u, v);

      data[offsets[0]] = CLAMP (r, 0, 255);
      data[offsets[1]] = CLAMP (g, 0, 255);
      data[offsets[2]] = CLAMP (b, 0, 255);
      data += pixel_stride;
    }
    data += row_wrap;
  }
}

static void
gst_video_crop_transform_planar (GstVideoCrop * vcrop,
    GstVideoFrame * in_frame, GstVideoFrame * out_frame)
{
  gint width, height;
  guint8 *y_out, *u_out, *v_out;
  guint8 *y_in, *u_in, *v_in;
  guint i, dx;

  width = GST_VIDEO_FRAME_WIDTH (out_frame);
  height = GST_VIDEO_FRAME_HEIGHT (out_frame);

  /* Y plane */
  y_in = GST_VIDEO_FRAME_PLANE_DATA (in_frame, 0);
  y_out = GST_VIDEO_FRAME_PLANE_DATA (out_frame, 0);

  y_in +=
      (vcrop->crop_top * GST_VIDEO_FRAME_PLANE_STRIDE (in_frame,
          0)) + vcrop->crop_left;
  dx = width;

  for (i = 0; i < height; ++i) {
    memcpy (y_out, y_in, dx);
    y_in += GST_VIDEO_FRAME_PLANE_STRIDE (in_frame, 0);
    y_out += GST_VIDEO_FRAME_PLANE_STRIDE (out_frame, 0);
  }

  /* U + V planes */
  u_in = GST_VIDEO_FRAME_PLANE_DATA (in_frame, 1);
  u_out = GST_VIDEO_FRAME_PLANE_DATA (out_frame, 1);

  u_in += (vcrop->crop_top / 2) * GST_VIDEO_FRAME_PLANE_STRIDE (in_frame, 1);
  u_in += vcrop->crop_left / 2;

  v_in = GST_VIDEO_FRAME_PLANE_DATA (in_frame, 2);
  v_out = GST_VIDEO_FRAME_PLANE_DATA (out_frame, 2);

  v_in += (vcrop->crop_top / 2) * GST_VIDEO_FRAME_PLANE_STRIDE (in_frame, 2);
  v_in += vcrop->crop_left / 2;

  dx = GST_ROUND_UP_2 (width) / 2;

  for (i = 0; i < GST_ROUND_UP_2 (height) / 2; ++i) {
    memcpy (u_out, u_in, dx);
    memcpy (v_out, v_in, dx);
    u_in += GST_VIDEO_FRAME_PLANE_STRIDE (in_frame, 1);
    u_out += GST_VIDEO_FRAME_PLANE_STRIDE (out_frame, 1);
    v_in += GST_VIDEO_FRAME_PLANE_STRIDE (in_frame, 2);
    v_out += GST_VIDEO_FRAME_PLANE_STRIDE (out_frame, 2);
  }
}

static void
gst_smpte_alpha_process_ayuv_ayuv (GstSMPTEAlpha * smpte,
    const GstVideoFrame * in_frame, GstVideoFrame * out_frame, GstMask * mask,
    gint border, gint pos)
{
  gint i, j;
  const guint32 *maskp;
  gint value;
  gint min, max;
  gint width, height;
  guint8 *in, *out;
  gint src_wrap, dest_wrap;

  if (border == 0)
    border++;

  min = pos - border;
  max = pos;
  GST_DEBUG_OBJECT (smpte, "pos %d, min %d, max %d, border %d", pos, min, max,
      border);

  maskp = mask->data;

  width = GST_VIDEO_FRAME_WIDTH (out_frame);
  height = GST_VIDEO_FRAME_HEIGHT (out_frame);

  in = GST_VIDEO_FRAME_PLANE_DATA (in_frame, 0);
  out = GST_VIDEO_FRAME_PLANE_DATA (out_frame, 0);
  src_wrap = GST_VIDEO_FRAME_PLANE_STRIDE (in_frame, 0) - (width << 2);
  dest_wrap = GST_VIDEO_FRAME_PLANE_STRIDE (out_frame, 0) - (width << 2);

  /* we basically copy the source to dest but we scale the alpha channel with
   * the mask */
  for (i = 0; i < height; i++) {
    for (j = 0; j < width; j++) {
      value = *maskp++;
      *out++ = (*in++ * ((CLAMP (value, min, max) - min) << 8) / border) >> 8;
      *out++ = *in++;
      *out++ = *in++;
      *out++ = *in++;
    }
    in += src_wrap;
    out += dest_wrap;
  }
}