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cogl-gst: add cogl_gst_video_sink_get_natural_size() api

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This adds api for querying a "natural" width and height for a video
which has the correct aspect ratio for displaying on square, 1:1 pixels.

The natural size is the minimum size where downscaling is not required.

Reviewed-by: Neil Roberts <neil@linux.intel.com>
This commit is contained in:
Robert Bragg 2014-03-13 01:20:52 +00:00 committed by Robert Bragg
parent 0e2771a4a4
commit 849f691969
2 changed files with 119 additions and 0 deletions
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48
cogl-gst/cogl-gst-video-sink.c
View File

@ -1658,6 +1658,54 @@ cogl_gst_video_sink_fit_size (CoglGstVideoSink *vt,
}
}
void
cogl_gst_video_sink_get_natural_size (CoglGstVideoSink *vt,
float *width,
float *height)
{
GstVideoInfo *info;
g_return_val_if_fail (COGL_GST_IS_VIDEO_SINK (vt), 0.);
info = &vt->priv->info;
if (info->par_n > info->par_d)
{
/* To display the video at the right aspect ratio then in this
* case the pixels need to be stretched horizontally and so we
* use the unscaled height as our reference.
*/
if (height)
*height = info->height;
if (width)
*width = cogl_gst_video_sink_get_width_for_height (vt, info->height);
}
else
{
if (width)
*width = info->width;
if (height)
*height = cogl_gst_video_sink_get_height_for_width (vt, info->width);
}
}
float
cogl_gst_video_sink_get_natural_width (CoglGstVideoSink *vt)
{
float width;
cogl_gst_video_sink_get_natural_size (vt, &width, NULL);
return width;
}
float
cogl_gst_video_sink_get_natural_height (CoglGstVideoSink *vt)
{
float height;
cogl_gst_video_sink_get_natural_size (vt, NULL, &height);
return height;
}
CoglBool
cogl_gst_video_sink_is_ready (CoglGstVideoSink *sink)
{

71
cogl-gst/cogl-gst-video-sink.h
View File

@ -412,6 +412,77 @@ float
cogl_gst_video_sink_get_height_for_width (CoglGstVideoSink *sink,
float width);
/**
* cogl_gst_video_sink_get_natural_size:
* @sink: A #CoglGstVideoSink
* @width: (out): return location for the video's natural width
* @height: (out): return location for the video's natural height
*
* Considering the real resolution of the video as well as the aspect
* ratio of pixel data that may need to be stretched when being displayed;
* this function calculates what the natural size of the underlying
* video source is.
*
* The natural size has the correct aspect ratio for displaying the
* video and is the minimum size where downscaling is not required.
*
* <note>This natural size is calculated assuming that the video will
* be displayed on square pixels.</note>
*
* Since: 1.18
* Stability: unstable
*/
void
cogl_gst_video_sink_get_natural_size (CoglGstVideoSink *sink,
float *width,
float *height);
/**
* cogl_gst_video_sink_get_natural_width:
* @sink: A #CoglGstVideoSink
*
* Considering the real resolution of the video as well as the aspect
* ratio of pixel data that may need to be stretched when being displayed;
* this function calculates what the natural size of the underlying
* video source is, and returns its width.
*
* The natural size has the correct aspect ratio for displaying the
* video and is the minimum size where downscaling is not required.
*
* <note>This natural size is calculated assuming that the video will
* be displayed on square pixels.</note>
*
* Return value: The video's natural width
*
* Since: 1.18
* Stability: unstable
*/
float
cogl_gst_video_sink_get_natural_width (CoglGstVideoSink *sink);
/**
* cogl_gst_video_sink_get_natural_height:
* @sink: A #CoglGstVideoSink
*
* Considering the real resolution of the video as well as the aspect
* ratio of pixel data that may need to be stretched when being displayed;
* this function calculates what the natural size of the underlying
* video source is, and returns its height.
*
* The natural size has the correct aspect ratio for displaying the
* video and is the minimum size where downscaling is not required.
*
* <note>This natural size is calculated assuming that the video will
* be displayed on square pixels.</note>
*
* Return value: The video's natural height
*
* Since: 1.18
* Stability: unstable
*/
float
cogl_gst_video_sink_get_natural_height (CoglGstVideoSink *sink);
/**
* CoglGstRectangle:
* @x: The X coordinate of the top left of the rectangle