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videometa: make video metatransform

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Make more generic video meta transform data that can be used for many video
transformations later.
This commit is contained in:
Wim Taymans 2012-03-06 12:52:01 +01:00
parent 6885b9d397
commit 4da57f08a1
2 changed files with 29 additions and 14 deletions
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22
gst-libs/gst/video/gstvideometa.c
View file

@ -323,8 +323,26 @@ gst_video_crop_meta_transform (GstBuffer * dest, GstMeta * meta,
dmeta->width = smeta->width;
dmeta->height = smeta->height;
} else if (GST_VIDEO_META_TRANSFORM_IS_SCALE (type)) {
/* FIXME, do something */
GST_DEBUG ("scaling crop metadata");
GstVideoMetaTransform *trans = data;
gint ow, oh, nw, nh;
smeta = (GstVideoCropMeta *) meta;
dmeta = gst_buffer_add_video_crop_meta (dest);
ow = GST_VIDEO_INFO_WIDTH (trans->in_info);
nw = GST_VIDEO_INFO_WIDTH (trans->out_info);
oh = GST_VIDEO_INFO_HEIGHT (trans->in_info);
nh = GST_VIDEO_INFO_HEIGHT (trans->out_info);
GST_DEBUG ("scaling crop metadata %dx%d -> %dx%d", ow, oh, nw, nh);
dmeta->x = (smeta->x * nw) / ow;
dmeta->y = (smeta->y * nh) / oh;
dmeta->width = (smeta->width * nw) / ow;
dmeta->height = (smeta->height * nh) / oh;
GST_DEBUG ("crop offset %dx%d -> %dx%d", smeta->x, smeta->y, dmeta->x,
dmeta->y);
GST_DEBUG ("crop size %dx%d -> %dx%d", smeta->width, smeta->height,
dmeta->width, dmeta->height);
}
return TRUE;
}

21
gst-libs/gst/video/gstvideometa.h
View file

@ -115,7 +115,7 @@ const GstMetaInfo * gst_video_crop_meta_get_info (void);
#define gst_buffer_get_video_crop_meta(b) ((GstVideoCropMeta*)gst_buffer_get_meta((b),GST_VIDEO_CROP_META_API_TYPE))
#define gst_buffer_add_video_crop_meta(b) ((GstVideoCropMeta*)gst_buffer_add_meta((b),GST_VIDEO_CROP_META_INFO, NULL))
/* metadata transforms */
/* video metadata transforms */
GQuark gst_video_meta_transform_scale_get_quark (void);
/**
@ -126,20 +126,17 @@ GQuark gst_video_meta_transform_scale_get_quark (void);
#define GST_VIDEO_META_TRANSFORM_IS_SCALE(type) ((type) == gst_video_meta_transform_scale_get_quark())
/**
* GstVideoMetaTransformScale:
* @old_width: the old width
* @old_height: the old height
* @new_width: the new width
* @new_height: the new height
* GstVideoMetaTransform:
* @old_info: the old #GstVideoInfo
* @new_info: the new #GstVideoInfo
*
* Extra data passed to a video "scale" transform #GstMetaTransformFunction.
* Extra data passed to a video transform #GstMetaTransformFunction such as:
* "gst-video-scale".
*/
typedef struct {
gint old_width;
gint old_height;
gint new_width;
gint new_height;
} GstVideoMetaTransformScale;
GstVideoInfo *in_info;
GstVideoInfo *out_info;
} GstVideoMetaTransform;
G_END_DECLS