C++ GST_VIDEO_FRAME_COMP_DATA函数代码示例

static GstFlowReturn
gst_pixbufscale_transform_frame (GstVideoFilter * filter,
    GstVideoFrame * in, GstVideoFrame * out)
{
  GstPixbufScale *scale;
  GdkPixbuf *src_pixbuf, *dest_pixbuf;

  scale = GST_PIXBUFSCALE (filter);

  src_pixbuf =
      gdk_pixbuf_new_from_data (GST_VIDEO_FRAME_COMP_DATA (in, 0),
      GDK_COLORSPACE_RGB, FALSE, 8, GST_VIDEO_FRAME_WIDTH (in),
      GST_VIDEO_FRAME_HEIGHT (in),
      GST_VIDEO_FRAME_COMP_STRIDE (in, 0), NULL, NULL);

  dest_pixbuf =
      gdk_pixbuf_new_from_data (GST_VIDEO_FRAME_COMP_DATA (out, 0),
      GDK_COLORSPACE_RGB, FALSE, 8, GST_VIDEO_FRAME_WIDTH (out),
      GST_VIDEO_FRAME_HEIGHT (out),
      GST_VIDEO_FRAME_COMP_STRIDE (out, 0), NULL, NULL);

  gdk_pixbuf_scale (src_pixbuf, dest_pixbuf, 0, 0,
      GST_VIDEO_FRAME_WIDTH (out),
      GST_VIDEO_FRAME_HEIGHT (out), 0, 0,
      (double) GST_VIDEO_FRAME_WIDTH (out) / GST_VIDEO_FRAME_WIDTH (in),
      (double) GST_VIDEO_FRAME_HEIGHT (out) / GST_VIDEO_FRAME_HEIGHT (in),
      scale->gdk_method);

  g_object_unref (src_pixbuf);
  g_object_unref (dest_pixbuf);

  return GST_FLOW_OK;
}

void GStreamerReader::ImageDataFromVideoFrame(GstVideoFrame *aFrame,
                                              PlanarYCbCrImage::Data *aData)
{
  NS_ASSERTION(GST_VIDEO_INFO_IS_YUV(&mVideoInfo),
               "Non-YUV video frame formats not supported");
  NS_ASSERTION(GST_VIDEO_FRAME_N_COMPONENTS(aFrame) == 3,
               "Unsupported number of components in video frame");

  aData->mPicX = aData->mPicY = 0;
  aData->mPicSize = gfx::IntSize(mPicture.width, mPicture.height);
  aData->mStereoMode = StereoMode::MONO;

  aData->mYChannel = GST_VIDEO_FRAME_COMP_DATA(aFrame, 0);
  aData->mYStride = GST_VIDEO_FRAME_COMP_STRIDE(aFrame, 0);
  aData->mYSize = gfx::IntSize(GST_VIDEO_FRAME_COMP_WIDTH(aFrame, 0),
                          GST_VIDEO_FRAME_COMP_HEIGHT(aFrame, 0));
  aData->mYSkip = GST_VIDEO_FRAME_COMP_PSTRIDE(aFrame, 0) - 1;
  aData->mCbCrStride = GST_VIDEO_FRAME_COMP_STRIDE(aFrame, 1);
  aData->mCbCrSize = gfx::IntSize(GST_VIDEO_FRAME_COMP_WIDTH(aFrame, 1),
                             GST_VIDEO_FRAME_COMP_HEIGHT(aFrame, 1));
  aData->mCbChannel = GST_VIDEO_FRAME_COMP_DATA(aFrame, 1);
  aData->mCrChannel = GST_VIDEO_FRAME_COMP_DATA(aFrame, 2);
  aData->mCbSkip = GST_VIDEO_FRAME_COMP_PSTRIDE(aFrame, 1) - 1;
  aData->mCrSkip = GST_VIDEO_FRAME_COMP_PSTRIDE(aFrame, 2) - 1;
}

static void
gst_video_balance_packed_yuv (GstVideoBalance * videobalance,
    GstVideoFrame * frame)
{
  gint x, y, stride;
  guint8 *ydata, *udata, *vdata;
  gint yoff, uoff, voff;
  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);

  stride = GST_VIDEO_FRAME_PLANE_STRIDE (frame, 0);
  ydata = GST_VIDEO_FRAME_COMP_DATA (frame, 0);
  yoff = GST_VIDEO_FRAME_COMP_PSTRIDE (frame, 0);

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

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

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

  udata = GST_VIDEO_FRAME_COMP_DATA (frame, 1);
  vdata = GST_VIDEO_FRAME_COMP_DATA (frame, 2);
  uoff = GST_VIDEO_FRAME_COMP_PSTRIDE (frame, 1);
  voff = GST_VIDEO_FRAME_COMP_PSTRIDE (frame, 2);

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

    uptr = udata + y * stride;
    vptr = vdata + y * stride;

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

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

      uptr += uoff;
      vptr += voff;
    }
  }
}

static void
gst_smpte_blend_i420 (GstVideoFrame * frame1, GstVideoFrame * frame2,
    GstVideoFrame * oframe, GstMask * mask, gint border, gint pos)
{
  guint32 *maskp;
  gint value;
  gint i, j;
  gint min, max;
  guint8 *in1, *in2, *out, *in1u, *in1v, *in2u, *in2v, *outu, *outv;
  gint width, height;

  if (border == 0)
    border++;

  min = pos - border;
  max = pos;

  width = GST_VIDEO_FRAME_WIDTH (frame1);
  height = GST_VIDEO_FRAME_HEIGHT (frame1);

  in1 = GST_VIDEO_FRAME_COMP_DATA (frame1, 0);
  in2 = GST_VIDEO_FRAME_COMP_DATA (frame2, 0);
  out = GST_VIDEO_FRAME_COMP_DATA (oframe, 0);

  in1u = GST_VIDEO_FRAME_COMP_DATA (frame1, 1);
  in1v = GST_VIDEO_FRAME_COMP_DATA (frame1, 2);
  in2u = GST_VIDEO_FRAME_COMP_DATA (frame2, 1);
  in2v = GST_VIDEO_FRAME_COMP_DATA (frame2, 2);
  outu = GST_VIDEO_FRAME_COMP_DATA (oframe, 1);
  outv = GST_VIDEO_FRAME_COMP_DATA (oframe, 2);

  maskp = mask->data;

  for (i = 0; i < height; i++) {
    for (j = 0; j < width; j++) {
      value = *maskp++;
      value = ((CLAMP (value, min, max) - min) << 8) / border;

      out[j] = ((in1[j] * value) + (in2[j] * (256 - value))) >> 8;
      if (!(i & 1) && !(j & 1)) {
        outu[j / 2] =
            ((in1u[j / 2] * value) + (in2u[j / 2] * (256 - value))) >> 8;
        outv[j / 2] =
            ((in1v[j / 2] * value) + (in2v[j / 2] * (256 - value))) >> 8;
      }
    }

    in1 += GST_VIDEO_FRAME_COMP_STRIDE (frame1, 0);
    in2 += GST_VIDEO_FRAME_COMP_STRIDE (frame2, 0);
    out += GST_VIDEO_FRAME_COMP_STRIDE (oframe, 0);

    if (!(i & 1)) {
      in1u += GST_VIDEO_FRAME_COMP_STRIDE (frame1, 1);
      in2u += GST_VIDEO_FRAME_COMP_STRIDE (frame2, 1);
      in1v += GST_VIDEO_FRAME_COMP_STRIDE (frame1, 2);
      in2v += GST_VIDEO_FRAME_COMP_STRIDE (frame1, 2);
      outu += GST_VIDEO_FRAME_COMP_STRIDE (oframe, 1);
      outv += GST_VIDEO_FRAME_COMP_STRIDE (oframe, 2);
    }
  }

static void
gst_av1_enc_fill_image (GstAV1Enc * enc, GstVideoFrame * frame,
    aom_image_t * image)
{
  image->planes[AOM_PLANE_Y] = GST_VIDEO_FRAME_COMP_DATA (frame, 0);
  image->planes[AOM_PLANE_U] = GST_VIDEO_FRAME_COMP_DATA (frame, 1);
  image->planes[AOM_PLANE_V] = GST_VIDEO_FRAME_COMP_DATA (frame, 2);

  image->stride[AOM_PLANE_Y] = GST_VIDEO_FRAME_COMP_STRIDE (frame, 0);
  image->stride[AOM_PLANE_U] = GST_VIDEO_FRAME_COMP_STRIDE (frame, 1);
  image->stride[AOM_PLANE_V] = GST_VIDEO_FRAME_COMP_STRIDE (frame, 2);
}

static GstFlowReturn
gst_gaussianblur_transform_frame (GstVideoFilter * vfilter,
    GstVideoFrame * in_frame, GstVideoFrame * out_frame)
{
  GstGaussianBlur *filter = GST_GAUSSIANBLUR (vfilter);
  GstClockTime timestamp;
  gint64 stream_time;
  gfloat sigma;
  guint8 *src, *dest;

  /* GstController: update the properties */
  timestamp = GST_BUFFER_TIMESTAMP (in_frame->buffer);
  stream_time =
      gst_segment_to_stream_time (&GST_BASE_TRANSFORM (filter)->segment,
      GST_FORMAT_TIME, timestamp);

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

  if (GST_CLOCK_TIME_IS_VALID (stream_time))
    gst_object_sync_values (GST_OBJECT (filter), stream_time);

  GST_OBJECT_LOCK (filter);
  sigma = filter->sigma;
  GST_OBJECT_UNLOCK (filter);

  if (filter->cur_sigma != sigma) {
    g_free (filter->kernel);
    filter->kernel = NULL;
    g_free (filter->kernel_sum);
    filter->kernel_sum = NULL;
    filter->cur_sigma = sigma;
  }
  if (filter->kernel == NULL &&
      !make_gaussian_kernel (filter, filter->cur_sigma)) {
    GST_ELEMENT_ERROR (filter, RESOURCE, NO_SPACE_LEFT, ("Out of memory"),
        ("Failed to allocation gaussian kernel"));
    return GST_FLOW_ERROR;
  }

  /*
   * Perform gaussian smoothing on the image using the input standard
   * deviation.
   */
  src = GST_VIDEO_FRAME_COMP_DATA (in_frame, 0);
  dest = GST_VIDEO_FRAME_COMP_DATA (out_frame, 0);
  gst_video_frame_copy (out_frame, in_frame);
  gaussian_smooth (filter, src, dest);

  return GST_FLOW_OK;
}

void
yadif_filter (GstYadif * yadif, int parity, int tff)
{
  int y, i;
  const GstVideoInfo *vi = &yadif->video_info;
  const GstVideoFormatInfo *vfi = vi->finfo;

  for (i = 0; i < GST_VIDEO_FORMAT_INFO_N_COMPONENTS (vfi); i++) {
    int w = GST_VIDEO_FORMAT_INFO_SCALE_WIDTH (vfi, i, vi->width);
    int h = GST_VIDEO_FORMAT_INFO_SCALE_HEIGHT (vfi, i, vi->height);
    int refs = GST_VIDEO_INFO_COMP_STRIDE (vi, i);
    int df = GST_VIDEO_INFO_COMP_PSTRIDE (vi, i);
    guint8 *prev_data = GST_VIDEO_FRAME_COMP_DATA (&yadif->prev_frame, i);
    guint8 *cur_data = GST_VIDEO_FRAME_COMP_DATA (&yadif->cur_frame, i);
    guint8 *next_data = GST_VIDEO_FRAME_COMP_DATA (&yadif->next_frame, i);
    guint8 *dest_data = GST_VIDEO_FRAME_COMP_DATA (&yadif->dest_frame, i);

    for (y = 0; y < h; y++) {
      if ((y ^ parity) & 1) {
        guint8 *prev = prev_data + y * refs;
        guint8 *cur = cur_data + y * refs;
        guint8 *next = next_data + y * refs;
        guint8 *dst = dest_data + y * refs;
        int mode = ((y == 1) || (y + 2 == h)) ? 2 : yadif->mode;
#if HAVE_CPU_X86_64
        if (0) {
          filter_line_c (dst, prev, cur, next, w,
              y + 1 < h ? refs : -refs, y ? -refs : refs, parity ^ tff, mode);
        } else {
          filter_line_x86_64 (dst, prev, cur, next, w,
              y + 1 < h ? refs : -refs, y ? -refs : refs, parity ^ tff, mode);
        }
#else
        filter_line_c (dst, prev, cur, next, w,
            y + 1 < h ? refs : -refs, y ? -refs : refs, parity ^ tff, mode);
#endif
      } else {
        guint8 *dst = dest_data + y * refs;
        guint8 *cur = cur_data + y * refs;

        memcpy (dst, cur, w * df);
      }
    }
  }

#if 0
  emms_c ();
#endif
}

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 GdkPixbuf *
gst_gdk_pixbuf_sink_get_pixbuf_from_buffer (GstGdkPixbufSink * sink,
    GstBuffer * buf)
{
  GdkPixbuf *pix = NULL;
  GstVideoFrame *frame;
  gint minsize, bytes_per_pixel;

  g_return_val_if_fail (GST_VIDEO_SINK_WIDTH (sink) > 0, NULL);
  g_return_val_if_fail (GST_VIDEO_SINK_HEIGHT (sink) > 0, NULL);

  frame = g_slice_new0 (GstVideoFrame);
  gst_video_frame_map (frame, &sink->info, buf, GST_MAP_READ);

  bytes_per_pixel = (sink->has_alpha) ? 4 : 3;

  /* last row needn't have row padding */
  minsize = (GST_VIDEO_FRAME_COMP_STRIDE (frame, 0) *
      (GST_VIDEO_SINK_HEIGHT (sink) - 1)) +
      (bytes_per_pixel * GST_VIDEO_SINK_WIDTH (sink));

  g_return_val_if_fail (gst_buffer_get_size (buf) >= minsize, NULL);

  gst_buffer_ref (buf);
  pix = gdk_pixbuf_new_from_data (GST_VIDEO_FRAME_COMP_DATA (frame, 0),
      GDK_COLORSPACE_RGB, sink->has_alpha, 8, GST_VIDEO_SINK_WIDTH (sink),
      GST_VIDEO_SINK_HEIGHT (sink), GST_VIDEO_FRAME_COMP_STRIDE (frame, 0),
      (GdkPixbufDestroyNotify) gst_gdk_pixbuf_sink_pixbuf_destroy_notify,
      frame);

  return pix;
}

static void
user_endrow_callback (png_structp png_ptr, png_bytep new_row,
    png_uint_32 row_num, int pass)
{
  GstPngDec *pngdec = NULL;

  pngdec = GST_PNGDEC (png_get_io_ptr (png_ptr));

  /* FIXME: implement interlaced pictures */

  /* If buffer_out doesn't exist, it means buffer_alloc failed, which 
   * will already have set the return code */
  if (GST_IS_BUFFER (pngdec->current_frame->output_buffer)) {
    GstVideoFrame frame;
    GstBuffer *buffer = pngdec->current_frame->output_buffer;
    size_t offset;
    gint width;
    guint8 *data;

    if (!gst_video_frame_map (&frame, &pngdec->output_state->info, buffer,
            GST_MAP_WRITE)) {
      pngdec->ret = GST_FLOW_ERROR;
      return;
    }

    data = GST_VIDEO_FRAME_COMP_DATA (&frame, 0);
    offset = row_num * GST_VIDEO_FRAME_COMP_STRIDE (&frame, 0);
    GST_LOG ("got row %u, copying in buffer %p at offset %" G_GSIZE_FORMAT,
        (guint) row_num, pngdec->current_frame->output_buffer, offset);
    width = GST_ROUND_UP_4 (png_get_rowbytes (pngdec->png, pngdec->info));
    memcpy (data + offset, new_row, width);
    gst_video_frame_unmap (&frame);
    pngdec->ret = GST_FLOW_OK;
  }
}

static void
theora_enc_init_buffer (th_ycbcr_buffer buf, GstVideoFrame * frame)
{
    GstVideoInfo vinfo;
    guint i;

    /* According to Theora developer Timothy Terriberry, the Theora
     * encoder will not use memory outside of pic_width/height, even when
     * the frame size is bigger. The values outside this region will be encoded
     * to default values.
     * Due to this, setting the frame's width/height as the buffer width/height
     * is perfectly ok, even though it does not strictly look ok.
     */

    gst_video_info_init (&vinfo);
    gst_video_info_set_format (&vinfo, GST_VIDEO_FRAME_FORMAT (frame),
                               GST_ROUND_UP_16 (GST_VIDEO_FRAME_WIDTH (frame)),
                               GST_ROUND_UP_16 (GST_VIDEO_FRAME_HEIGHT (frame)));

    for (i = 0; i < 3; i++) {
        buf[i].width = GST_VIDEO_INFO_COMP_WIDTH (&vinfo, i);
        buf[i].height = GST_VIDEO_INFO_COMP_HEIGHT (&vinfo, i);
        buf[i].data = GST_VIDEO_FRAME_COMP_DATA (frame, i);
        buf[i].stride = GST_VIDEO_FRAME_COMP_STRIDE (frame, i);
    }
}

static void
fill_frame_planar16_3 (GstVideoFrame * frame, opj_image_t * image)
{
  gint c, x, y, w, h;
  guint16 *data_out, *tmp;
  const gint *data_in;
  gint dstride;
  gint shift;

  for (c = 0; c < 3; c++) {
    w = GST_VIDEO_FRAME_COMP_WIDTH (frame, c);
    h = GST_VIDEO_FRAME_COMP_HEIGHT (frame, c);
    dstride = GST_VIDEO_FRAME_COMP_STRIDE (frame, c) / 2;
    data_out = (guint16 *) GST_VIDEO_FRAME_COMP_DATA (frame, c);
    data_in = image->comps[c].data;
    shift = 16 - image->comps[c].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
user_endrow_callback (png_structp png_ptr, png_bytep new_row,
    png_uint_32 row_num, int pass)
{
  GstPngDec *pngdec = NULL;

  pngdec = GST_PNGDEC (png_get_io_ptr (png_ptr));

  /* If buffer_out doesn't exist, it means buffer_alloc failed, which 
   * will already have set the return code */
  if (new_row && GST_IS_BUFFER (pngdec->current_frame->output_buffer)) {
    GstVideoFrame frame;
    GstBuffer *buffer = pngdec->current_frame->output_buffer;
    size_t offset;
    guint8 *data;

    if (!gst_video_frame_map (&frame, &pngdec->output_state->info, buffer,
            GST_MAP_WRITE)) {
      pngdec->ret = GST_FLOW_ERROR;
      return;
    }

    data = GST_VIDEO_FRAME_COMP_DATA (&frame, 0);
    offset = row_num * GST_VIDEO_FRAME_COMP_STRIDE (&frame, 0);
    GST_LOG ("got row %u at pass %d, copying in buffer %p at offset %"
        G_GSIZE_FORMAT, (guint) row_num, pass,
        pngdec->current_frame->output_buffer, offset);
    png_progressive_combine_row (pngdec->png, data + offset, new_row);
    gst_video_frame_unmap (&frame);
    pngdec->ret = GST_FLOW_OK;
  } else
    pngdec->ret = GST_FLOW_OK;
}

static void
gst_jpeg_dec_decode_rgb (GstJpegDec * dec, GstVideoFrame * frame)
{
  guchar *r_rows[16], *g_rows[16], *b_rows[16];
  guchar **scanarray[3] = { r_rows, g_rows, b_rows };
  gint i, j, k;
  gint lines;
  guint8 *base[3];
  guint pstride, rstride;
  gint width, height;

  GST_DEBUG_OBJECT (dec, "indirect decoding of RGB");

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

  if (G_UNLIKELY (!gst_jpeg_dec_ensure_buffers (dec, GST_ROUND_UP_32 (width))))
    return;

  for (i = 0; i < 3; i++)
    base[i] = GST_VIDEO_FRAME_COMP_DATA (frame, i);

  pstride = GST_VIDEO_FRAME_COMP_PSTRIDE (frame, 0);
  rstride = GST_VIDEO_FRAME_COMP_STRIDE (frame, 0);

  memcpy (r_rows, dec->idr_y, 16 * sizeof (gpointer));
  memcpy (g_rows, dec->idr_u, 16 * sizeof (gpointer));
  memcpy (b_rows, dec->idr_v, 16 * sizeof (gpointer));

  i = 0;
  while (i < height) {
    lines = jpeg_read_raw_data (&dec->cinfo, scanarray, DCTSIZE);
    if (G_LIKELY (lines > 0)) {
      for (j = 0; (j < DCTSIZE) && (i < height); j++, i++) {
        gint p;

        p = 0;
        for (k = 0; k < width; k++) {
          base[0][p] = r_rows[j][k];
          base[1][p] = g_rows[j][k];
          base[2][p] = b_rows[j][k];
          p += pstride;
        }
        base[0] += rstride;
        base[1] += rstride;
        base[2] += rstride;
      }
    } else {
      GST_INFO_OBJECT (dec, "jpeg_read_raw_data() returned 0");
    }
  }
}

/* Allocate buffer and copy image data into Y444 format */
static GstFlowReturn
daala_handle_image (GstDaalaDec * dec, od_img * img, GstVideoCodecFrame * frame)
{
  GstVideoDecoder *decoder = GST_VIDEO_DECODER (dec);
  gint width, height, stride;
  GstFlowReturn result;
  gint i, comp;
  guint8 *dest, *src;
  GstVideoFrame vframe;

  result = gst_video_decoder_allocate_output_frame (decoder, frame);

  if (G_UNLIKELY (result != GST_FLOW_OK)) {
    GST_DEBUG_OBJECT (dec, "could not get buffer, reason: %s",
        gst_flow_get_name (result));
    return result;
  }

  /* if only libdaala would allow us to give it a destination frame */
  GST_CAT_TRACE_OBJECT (GST_CAT_PERFORMANCE, dec,
      "doing unavoidable video frame copy");

  if (G_UNLIKELY (!gst_video_frame_map (&vframe, &dec->output_state->info,
              frame->output_buffer, GST_MAP_WRITE)))
    goto invalid_frame;

  for (comp = 0; comp < 3; comp++) {
    width = GST_VIDEO_FRAME_COMP_WIDTH (&vframe, comp);
    height = GST_VIDEO_FRAME_COMP_HEIGHT (&vframe, comp);
    stride = GST_VIDEO_FRAME_COMP_STRIDE (&vframe, comp);
    dest = GST_VIDEO_FRAME_COMP_DATA (&vframe, comp);

    src = img->planes[comp].data;

    for (i = 0; i < height; i++) {
      memcpy (dest, src, width);

      dest += stride;
      src += img->planes[comp].ystride;
    }
  }
  gst_video_frame_unmap (&vframe);

  return GST_FLOW_OK;
invalid_frame:
  {
    GST_DEBUG_OBJECT (dec, "could not map video frame");
    return GST_FLOW_ERROR;
  }
}