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multiview: Add gst_video_multiview_guess_half_aspect()

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Add a utility function that, given a video size and a
packed stereoscopic mode, attempts to guess if the video
is packed at half resolution per view or not, since
very few videos provide the information.
This commit is contained in:
Jan Schmidt 2015-06-15 16:04:55 +10:00
parent c0b0fd52f3
commit 95cd8dc4f1
2 changed files with 45 additions and 0 deletions
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42
gst-libs/gst/video/video-multiview.c
View file

@ -359,6 +359,48 @@ gst_video_multiview_video_info_change_mode (GstVideoInfo * info,
out_mview_flags);
}
/**
* gst_video_multiview_guess_half_aspect:
* @mv_mode: A #GstVideoMultiviewMode
* @width: Video frame width in pixels
* @height: Video frame height in pixels
* @par_n: Numerator of the video pixel-aspect-ratio
* @par_d: Denominator of the video pixel-aspect-ratio
*
* Returns: A boolean indicating whether the
* #GST_VIDEO_MULTIVIEW_FLAG_HALF_ASPECT flag should be set.
*
* Utility function that heuristically guess whether a
* frame-packed stereoscopic video contains half width/height
* encoded views, or full-frame views by looking at the
* overall display aspect ratio.
*
* Since: 1.6
*/
gboolean
gst_video_multiview_guess_half_aspect (GstVideoMultiviewMode mv_mode,
guint width, guint height, guint par_n, guint par_d)
{
switch (mv_mode) {
case GST_VIDEO_MULTIVIEW_MODE_TOP_BOTTOM:
case GST_VIDEO_MULTIVIEW_MODE_ROW_INTERLEAVED:
/* If the video is wider than it is tall, assume half aspect */
if (height * par_d <= width * par_n)
return TRUE;
break;
case GST_VIDEO_MULTIVIEW_MODE_SIDE_BY_SIDE:
case GST_VIDEO_MULTIVIEW_MODE_SIDE_BY_SIDE_QUINCUNX:
case GST_VIDEO_MULTIVIEW_MODE_COLUMN_INTERLEAVED:
/* If the video DAR is less than 2.39:1, assume half-aspect */
if (width * par_n < 2.39 * height * par_d)
return TRUE;
break;
default:
break;
}
return FALSE;
}
#if 0 /* Multiview meta disabled for now */
GType
gst_video_multiview_meta_api_get_type (void)

3
gst-libs/gst/video/video-multiview.h
View file

@ -38,6 +38,9 @@ const GValue *gst_video_multiview_get_doubled_size_modes(void);
void gst_video_multiview_video_info_change_mode (GstVideoInfo *info,
GstVideoMultiviewMode out_mview_mode, GstVideoMultiviewFlags out_mview_flags);
gboolean gst_video_multiview_guess_half_aspect (GstVideoMultiviewMode mv_mode,
guint width, guint height, guint par_n, guint par_d);
#if 0 /* Place-holder for later MVC support */
#define GST_VIDEO_MULTIVIEW_META_API_TYPE (gst_video_multiview_meta_api_get_type())