static GstFlowReturn gst_imx_blitter_video_transform_prepare_output_buffer(GstBaseTransform *transform, GstBuffer *input, GstBuffer **outbuf)
{
gboolean passthrough = FALSE;
GstImxBlitterVideoTransform *blitter_video_transform = GST_IMX_BLITTER_VIDEO_TRANSFORM(transform);
GstImxBlitterVideoTransformClass *klass = GST_IMX_BLITTER_VIDEO_TRANSFORM_CLASS(G_OBJECT_GET_CLASS(transform));
g_assert(klass->are_transforms_necessary != NULL);
GST_IMX_BLITTER_VIDEO_TRANSFORM_LOCK(blitter_video_transform);
/* Test if passthrough should be enabled */
if ((input != NULL) && blitter_video_transform->inout_info_equal)
{
/* if there is an input buffer and the input/output caps are equal,
* assume passthrough should be used, and test for exceptions where
* passthrough must not be enabled; such exceptions are transforms
* like rotation, deinterlacing ... these are defined by the
* derived video transform class */
passthrough = !(klass->are_transforms_necessary(blitter_video_transform, input));
}
else if (!blitter_video_transform->inout_info_equal)
GST_LOG_OBJECT(transform, "input and output caps are not equal");
else if (input == NULL)
GST_LOG_OBJECT(transform, "input buffer is NULL");
GST_IMX_BLITTER_VIDEO_TRANSFORM_UNLOCK(blitter_video_transform);
GST_LOG_OBJECT(transform, "passthrough: %s", passthrough ? "yes" : "no");
if (passthrough)
{
*outbuf = input;
return GST_FLOW_OK;
}
else
return GST_BASE_TRANSFORM_CLASS(gst_imx_blitter_video_transform_parent_class)->prepare_output_buffer(transform, input, outbuf);
}
static GstFlowReturn gst_imx_blitter_video_transform_prepare_output_buffer(GstBaseTransform *transform, GstBuffer *input, GstBuffer **outbuf)
{
gboolean passthrough;
GstImxBlitterVideoTransform *blitter_video_transform = GST_IMX_BLITTER_VIDEO_TRANSFORM(transform);
GstImxBlitterVideoTransformClass *klass = GST_IMX_BLITTER_VIDEO_TRANSFORM_CLASS(G_OBJECT_GET_CLASS(transform));
GstVideoCropMeta *video_crop_meta;
gboolean update_canvas = FALSE;
/* If either there is no input buffer or in- and output info are not equal,
* it is clear there can be no passthrough mode */
passthrough = (input != NULL) && blitter_video_transform->inout_info_equal;
GST_IMX_BLITTER_VIDEO_TRANSFORM_LOCK(blitter_video_transform);
/* Check if cropping needs to be done */
if ((input != NULL) && blitter_video_transform->input_crop && ((video_crop_meta = gst_buffer_get_video_crop_meta(input)) != NULL))
{
GstImxRegion source_region;
gint in_width, in_height;
source_region.x1 = video_crop_meta->x;
source_region.y1 = video_crop_meta->y;
source_region.x2 = video_crop_meta->x + video_crop_meta->width;
source_region.y2 = video_crop_meta->y + video_crop_meta->height;
in_width = GST_VIDEO_INFO_WIDTH(&(blitter_video_transform->input_video_info));
in_height = GST_VIDEO_INFO_HEIGHT(&(blitter_video_transform->input_video_info));
/* Make sure the source region does not exceed valid bounds */
source_region.x1 = MAX(0, source_region.x1);
source_region.y1 = MAX(0, source_region.y1);
source_region.x2 = MIN(in_width, source_region.x2);
source_region.y2 = MIN(in_height, source_region.y2);
/* If the crop rectangle encompasses the entire frame, cropping is
* effectively a no-op, so make it passthrough in that case,
* unless passthrough is already FALSE */
passthrough = passthrough && (source_region.x1 == 0) && (source_region.y1 == 0) && (source_region.x2 == in_width) && (source_region.y2 == in_height);
GST_LOG_OBJECT(blitter_video_transform, "retrieved crop rectangle %" GST_IMX_REGION_FORMAT, GST_IMX_REGION_ARGS(&source_region));
/* Canvas needs to be updated if either one of these applies:
* - the current frame has crop metadata, the last one didn't
* - the new crop rectangle and the last are different */
if (!(blitter_video_transform->last_frame_with_cropdata) || !gst_imx_region_equal(&source_region, &(blitter_video_transform->last_source_region)))
{
GST_LOG_OBJECT(blitter_video_transform, "using new crop rectangle %" GST_IMX_REGION_FORMAT, GST_IMX_REGION_ARGS(&source_region));
blitter_video_transform->last_source_region = source_region;
update_canvas = TRUE;
}
blitter_video_transform->last_frame_with_cropdata = TRUE;
}
else
{
/* Force a canvas update if this frame has no crop metadata but the last one did */
if (blitter_video_transform->last_frame_with_cropdata)
update_canvas = TRUE;
blitter_video_transform->last_frame_with_cropdata = FALSE;
}
if (update_canvas)
{
GstImxRegion source_subset;
GstImxCanvas *canvas = &(blitter_video_transform->canvas);
gst_imx_canvas_clip(
canvas,
&(canvas->outer_region),
&(blitter_video_transform->input_video_info),
blitter_video_transform->last_frame_with_cropdata ? &(blitter_video_transform->last_source_region) : NULL,
&source_subset
);
gst_imx_blitter_set_input_region(blitter_video_transform->blitter, &source_subset);
gst_imx_blitter_set_output_canvas(blitter_video_transform->blitter, canvas);
}
if ((input != NULL) && passthrough)
{
/* test for additional special cases for passthrough must not be enabled
* such case are transforms like rotation, deinterlacing ... */
passthrough = passthrough && (blitter_video_transform->canvas.inner_rotation == GST_IMX_CANVAS_INNER_ROTATION_NONE) &&
(klass->are_transforms_necessary != NULL) &&
!(klass->are_transforms_necessary(blitter_video_transform, input));
}
else if (!blitter_video_transform->inout_info_equal)
GST_LOG_OBJECT(transform, "input and output caps are not equal");
else if (blitter_video_transform->last_frame_with_cropdata && !passthrough)
GST_LOG_OBJECT(transform, "cropping is performed");
else if (input == NULL)
GST_LOG_OBJECT(transform, "input buffer is NULL");
GST_IMX_BLITTER_VIDEO_TRANSFORM_UNLOCK(blitter_video_transform);
GST_LOG_OBJECT(transform, "passthrough: %s", passthrough ? "yes" : "no");
if (passthrough)
{
/* This instructs the base class to not allocate a new buffer for
* the output, and instead pass the input buffer as the output
* (this is used in the fransform_frame function below) */
*outbuf = input;
return GST_FLOW_OK;
}
else
return GST_BASE_TRANSFORM_CLASS(gst_imx_blitter_video_transform_parent_class)->prepare_output_buffer(transform, input, outbuf);
}