Esempi in C++ (Cpp) per gst_kms_sink_get_input_buffer

Esempio n. 1

File: gstkmssink.c Progetto: justinjoy/gst-plugins-bad

static GstFlowReturn
gst_kms_sink_show_frame (GstVideoSink * vsink, GstBuffer * buf)
{
  gint ret;
  GstBuffer *buffer;
  guint32 fb_id;
  GstKMSSink *self;
  GstVideoCropMeta *crop;
  GstVideoRectangle src = { 0, };
  GstVideoRectangle dst = { 0, };
  GstVideoRectangle result;
  GstFlowReturn res;

  self = GST_KMS_SINK (vsink);

  res = GST_FLOW_ERROR;

  buffer = gst_kms_sink_get_input_buffer (self, buf);
  if (!buffer)
    return GST_FLOW_ERROR;
  fb_id = gst_kms_memory_get_fb_id (gst_buffer_peek_memory (buffer, 0));
  if (fb_id == 0)
    goto buffer_invalid;

  GST_TRACE_OBJECT (self, "displaying fb %d", fb_id);

  {
    if ((crop = gst_buffer_get_video_crop_meta (buffer))) {
      src.x = crop->x;
      src.y = crop->y;
      src.w = crop->width;
      src.h = crop->height;
    } else {
      src.w = GST_VIDEO_SINK_WIDTH (self);
      src.h = GST_VIDEO_SINK_HEIGHT (self);
    }
  }

  dst.w = self->hdisplay;
  dst.h = self->vdisplay;

  gst_video_sink_center_rect (src, dst, &result, FALSE);

  /* if the frame size is bigger than the display size, the source
   * must be the display size */
  src.w = MIN (src.w, self->hdisplay);
  src.h = MIN (src.h, self->vdisplay);

  ret = drmModeSetPlane (self->fd, self->plane_id, self->crtc_id, fb_id, 0,
      result.x, result.y, result.w, result.h,
      /* source/cropping coordinates are given in Q16 */
      src.x << 16, src.y << 16, src.w << 16, src.h << 16);
  if (ret)
    goto set_plane_failed;

  /* Wait for the previous frame to complete redraw */
  if (!gst_kms_sink_sync (self))
    goto bail;

  gst_buffer_replace (&self->last_buffer, buffer);

  res = GST_FLOW_OK;

bail:
  gst_buffer_unref (buffer);
  return res;

  /* ERRORS */
buffer_invalid:
  {
    GST_ERROR_OBJECT (self, "invalid buffer: it doesn't have a fb id");
    goto bail;
  }
set_plane_failed:
  {
    GST_DEBUG_OBJECT (self, "result = { %d, %d, %d, %d} / "
        "src = { %d, %d, %d %d } / dst = { %d, %d, %d %d }", result.x, result.y,
        result.w, result.h, src.x, src.y, src.w, src.h, dst.x, dst.y, dst.w,
        dst.h);
    GST_ELEMENT_ERROR (self, RESOURCE, FAILED,
        (NULL), ("drmModeSetPlane failed: %s (%d)", strerror (-ret), ret));
    goto bail;
  }
}

Esempio n. 2

File: gstkmssink.c Progetto: GrokImageCompression/gst-plugins-bad

static GstFlowReturn
gst_kms_sink_show_frame (GstVideoSink * vsink, GstBuffer * buf)
{
  gint ret;
  GstBuffer *buffer;
  guint32 fb_id;
  GstKMSSink *self;
  GstVideoCropMeta *crop;
  GstVideoRectangle src = { 0, };
  GstVideoRectangle dst = { 0, };
  GstVideoRectangle result;
  GstFlowReturn res;

  self = GST_KMS_SINK (vsink);

  res = GST_FLOW_ERROR;

  buffer = gst_kms_sink_get_input_buffer (self, buf);
  if (!buffer)
    return GST_FLOW_ERROR;
  fb_id = gst_kms_memory_get_fb_id (gst_buffer_peek_memory (buffer, 0));
  if (fb_id == 0)
    goto buffer_invalid;

  GST_TRACE_OBJECT (self, "displaying fb %d", fb_id);

  if (self->modesetting_enabled) {
    self->buffer_id = fb_id;
    goto sync_frame;
  }

  if ((crop = gst_buffer_get_video_crop_meta (buffer))) {
    GstVideoInfo vinfo = self->vinfo;
    vinfo.width = crop->width;
    vinfo.height = crop->height;

    if (!gst_kms_sink_calculate_display_ratio (self, &vinfo))
      goto no_disp_ratio;

    src.x = crop->x;
    src.y = crop->y;
  }

  src.w = GST_VIDEO_SINK_WIDTH (self);
  src.h = GST_VIDEO_SINK_HEIGHT (self);

  dst.w = self->hdisplay;
  dst.h = self->vdisplay;

  gst_video_sink_center_rect (src, dst, &result, TRUE);

  if (crop) {
    src.w = crop->width;
    src.h = crop->height;
  } else {
    src.w = GST_VIDEO_INFO_WIDTH (&self->vinfo);
    src.h = GST_VIDEO_INFO_HEIGHT (&self->vinfo);
  }

  GST_TRACE_OBJECT (self,
      "drmModeSetPlane at (%i,%i) %ix%i sourcing at (%i,%i) %ix%i",
      result.x, result.y, result.w, result.h, src.x, src.y, src.w, src.h);

  ret = drmModeSetPlane (self->fd, self->plane_id, self->crtc_id, fb_id, 0,
      result.x, result.y, result.w, result.h,
      /* source/cropping coordinates are given in Q16 */
      src.x << 16, src.y << 16, src.w << 16, src.h << 16);
  if (ret)
    goto set_plane_failed;

sync_frame:
  /* Wait for the previous frame to complete redraw */
  if (!gst_kms_sink_sync (self))
    goto bail;

  gst_buffer_replace (&self->last_buffer, buffer);
  g_clear_pointer (&self->tmp_kmsmem, gst_memory_unref);

  res = GST_FLOW_OK;

bail:
  gst_buffer_unref (buffer);
  return res;

  /* ERRORS */
buffer_invalid:
  {
    GST_ERROR_OBJECT (self, "invalid buffer: it doesn't have a fb id");
    goto bail;
  }
set_plane_failed:
  {
    GST_DEBUG_OBJECT (self, "result = { %d, %d, %d, %d} / "
        "src = { %d, %d, %d %d } / dst = { %d, %d, %d %d }", result.x, result.y,
        result.w, result.h, src.x, src.y, src.w, src.h, dst.x, dst.y, dst.w,
        dst.h);
    GST_ELEMENT_ERROR (self, RESOURCE, FAILED,
        (NULL), ("drmModeSetPlane failed: %s (%d)", strerror (-ret), ret));
    goto bail;
  }
no_disp_ratio:
  {
    GST_ELEMENT_ERROR (self, CORE, NEGOTIATION, (NULL),
        ("Error calculating the output display ratio of the video."));
    goto bail;
  }
}