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meta: add metadata flags

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Add metadata flags so that we can set extra properties of the metadata
This commit is contained in:
Wim Taymans 2011-12-22 15:52:08 +01:00
parent ff59f3a553
commit 4bc7ff8e3e
2 changed files with 59 additions and 3 deletions
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8
gst/gstbuffer.c
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@ -1514,13 +1514,15 @@ gst_buffer_add_meta (GstBuffer * buffer, const GstMetaInfo * info,
g_return_val_if_fail (info != NULL, NULL);
/* create a new slice */
GST_CAT_DEBUG (GST_CAT_BUFFER, "alloc metadata %s of size %" G_GSIZE_FORMAT,
g_type_name (info->type), info->size);
size = ITEM_SIZE (info);
item = g_slice_alloc (size);
result = &item->meta;
result->info = info;
result->flags = GST_META_FLAG_NONE;
GST_CAT_DEBUG (GST_CAT_BUFFER,
"alloc metadata %p (%s) of size %" G_GSIZE_FORMAT, result,
g_type_name (info->type), info->size);
/* call the init_func when needed */
if (info->init_func)

54
gst/gstmeta.h
View file

@ -28,14 +28,68 @@ G_BEGIN_DECLS
typedef struct _GstMeta GstMeta;
typedef struct _GstMetaInfo GstMetaInfo;
#define GST_META_CAST(meta) ((GstMeta *)(meta))
/**
* GstMetaFlags:
* @GST_META_FLAG_NONE: no flags
* @GST_META_FLAG_READONLY: metadata should not be modified
* @GST_META_FLAG_POOLED: metadata is managed by a bufferpool and should not
* be removed
* @GST_META_FLAG_LAST: additional flags can be added starting from this flag.
*
* Extra metadata flags.
*/
typedef enum {
GST_META_FLAG_NONE = 0,
GST_META_FLAG_READONLY = (1 << 0),
GST_META_FLAG_POOLED = (1 << 1),
GST_META_FLAG_LAST = (1 << 16)
} GstMetaFlags;
/**
* GST_META_FLAGS:
* @meta: a #GstMeta.
*
* A flags word containing #GstMetaFlag flags set on @meta
*/
#define GST_META_FLAGS(meta) (GST_META_CAST (meta)->flags)
/**
* GST_META_FLAG_IS_SET:
* @meta: a #GstMeta.
* @flag: the #GstMetaFlag to check.
*
* Gives the status of a specific flag on a metadata.
*/
#define GST_META_FLAG_IS_SET(meta,flag) !!(GST_META_FLAGS (meta) & (flag))
/**
* GST_META_FLAG_SET:
* @meta: a #GstMeta.
* @flag: the #GstMetaFlag to set.
*
* Sets a metadata flag on a metadata.
*/
#define GST_META_FLAG_SET(meta,flag) (GST_META_FLAGS (meta) |= (flag))
/**
* GST_META_FLAG_UNSET:
* @meta: a #GstMeta.
* @flag: the #GstMetaFlag to clear.
*
* Clears a metadata flag.
*/
#define GST_META_FLAG_UNSET(meta,flag) (GST_META_FLAGS (meta) &= ~(flag))
/**
* GstMeta:
* @flags: extra flags for the metadata
* @info: pointer to the #GstMetaInfo
*
* Base structure for metadata. Custom metadata will put this structure
* as the first member of their structure.
*/
struct _GstMeta {
GstMetaFlags flags;
const GstMetaInfo *info;
};