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236 lines
6.8 KiB
C
236 lines
6.8 KiB
C
/* GStreamer
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* Copyright (C) 2009 Wim Taymans <wim.taymans@gmail.be>
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*
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* gstmeta.h: Header for Metadata structures
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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#ifndef __GST_META_H__
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#define __GST_META_H__
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#include <glib.h>
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G_BEGIN_DECLS
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typedef struct _GstMeta GstMeta;
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typedef struct _GstMetaInfo GstMetaInfo;
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#define GST_META_CAST(meta) ((GstMeta *)(meta))
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/**
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* GstMetaFlags:
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* @GST_META_FLAG_NONE: no flags
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* @GST_META_FLAG_READONLY: metadata should not be modified
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* @GST_META_FLAG_POOLED: metadata is managed by a bufferpool
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* @GST_META_FLAG_LOCKED: metadata should not be removed
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* @GST_META_FLAG_LAST: additional flags can be added starting from this flag.
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*
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* Extra metadata flags.
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*/
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typedef enum {
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GST_META_FLAG_NONE = 0,
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GST_META_FLAG_READONLY = (1 << 0),
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GST_META_FLAG_POOLED = (1 << 1),
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GST_META_FLAG_LOCKED = (1 << 2),
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GST_META_FLAG_LAST = (1 << 16)
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} GstMetaFlags;
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/**
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* GST_META_FLAGS:
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* @meta: a #GstMeta.
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*
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* A flags word containing #GstMetaFlags flags set on @meta
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*/
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#define GST_META_FLAGS(meta) (GST_META_CAST (meta)->flags)
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/**
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* GST_META_FLAG_IS_SET:
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* @meta: a #GstMeta.
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* @flag: the #GstMetaFlags to check.
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*
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* Gives the status of a specific flag on a metadata.
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*/
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#define GST_META_FLAG_IS_SET(meta,flag) !!(GST_META_FLAGS (meta) & (flag))
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/**
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* GST_META_FLAG_SET:
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* @meta: a #GstMeta.
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* @flag: the #GstMetaFlags to set.
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*
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* Sets a metadata flag on a metadata.
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*/
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#define GST_META_FLAG_SET(meta,flag) (GST_META_FLAGS (meta) |= (flag))
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/**
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* GST_META_FLAG_UNSET:
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* @meta: a #GstMeta.
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* @flag: the #GstMetaFlags to clear.
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*
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* Clears a metadata flag.
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*/
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#define GST_META_FLAG_UNSET(meta,flag) (GST_META_FLAGS (meta) &= ~(flag))
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/**
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* GST_META_TAG_MEMORY_STR:
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*
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* This metadata stays relevant as long as memory layout is unchanged.
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*
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* Since: 1.2
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*/
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#define GST_META_TAG_MEMORY_STR "memory"
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/**
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* GstMeta:
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* @flags: extra flags for the metadata
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* @info: pointer to the #GstMetaInfo
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*
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* Base structure for metadata. Custom metadata will put this structure
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* as the first member of their structure.
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*/
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struct _GstMeta {
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GstMetaFlags flags;
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const GstMetaInfo *info;
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};
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#include <gst/gstbuffer.h>
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/**
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* GstMetaInitFunction:
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* @meta: a #GstMeta
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* @params: parameters passed to the init function
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* @buffer: a #GstBuffer
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*
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* Function called when @meta is initialized in @buffer.
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*/
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typedef gboolean (*GstMetaInitFunction) (GstMeta *meta, gpointer params, GstBuffer *buffer);
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/**
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* GstMetaFreeFunction:
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* @meta: a #GstMeta
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* @buffer: a #GstBuffer
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*
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* Function called when @meta is freed in @buffer.
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*/
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typedef void (*GstMetaFreeFunction) (GstMeta *meta, GstBuffer *buffer);
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/**
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* gst_meta_transform_copy:
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*
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* GQuark for the "gst-copy" transform.
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*/
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GST_EXPORT GQuark _gst_meta_transform_copy;
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/**
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* GST_META_TRANSFORM_IS_COPY:
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* @type: a transform type
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*
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* Check if the transform type is a copy transform
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*/
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#define GST_META_TRANSFORM_IS_COPY(type) ((type) == _gst_meta_transform_copy)
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/**
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* GstMetaTransformCopy:
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* @region: %TRUE if only region is copied
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* @offset: the offset to copy, 0 if @region is %FALSE, otherwise > 0
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* @size: the size to copy, -1 or the buffer size when @region is %FALSE
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*
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* Extra data passed to a "gst-copy" transform #GstMetaTransformFunction.
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*/
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typedef struct {
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gboolean region;
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gsize offset;
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gsize size;
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} GstMetaTransformCopy;
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/**
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* GstMetaTransformFunction:
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* @transbuf: a #GstBuffer
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* @meta: a #GstMeta
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* @buffer: a #GstBuffer
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* @type: the transform type
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* @data: transform specific data.
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*
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* Function called for each @meta in @buffer as a result of performing a
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* transformation on @transbuf. Additional @type specific transform data
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* is passed to the function as @data.
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*
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* Implementations should check the @type of the transform and parse
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* additional type specific fields in @data that should be used to update
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* the metadata on @transbuf.
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*
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* Returns: %TRUE if the transform could be performed
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*/
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typedef gboolean (*GstMetaTransformFunction) (GstBuffer *transbuf,
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GstMeta *meta, GstBuffer *buffer,
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GQuark type, gpointer data);
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/**
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* GstMetaInfo:
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* @api: tag identifying the metadata structure and api
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* @type: type identifying the implementor of the api
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* @size: size of the metadata
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* @init_func: function for initializing the metadata
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* @free_func: function for freeing the metadata
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* @transform_func: function for transforming the metadata
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*
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* The #GstMetaInfo provides information about a specific metadata
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* structure.
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*/
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struct _GstMetaInfo {
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GType api;
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GType type;
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gsize size;
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GstMetaInitFunction init_func;
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GstMetaFreeFunction free_func;
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GstMetaTransformFunction transform_func;
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/* No padding needed, GstMetaInfo is always allocated by GStreamer and is
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* not subclassable or stack-allocatable, so we can extend it as we please
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* just like interfaces */
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};
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GType gst_meta_api_type_register (const gchar *api,
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const gchar **tags);
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gboolean gst_meta_api_type_has_tag (GType api, GQuark tag);
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const GstMetaInfo * gst_meta_register (GType api, const gchar *impl,
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gsize size,
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GstMetaInitFunction init_func,
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GstMetaFreeFunction free_func,
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GstMetaTransformFunction transform_func);
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const GstMetaInfo * gst_meta_get_info (const gchar * impl);
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const gchar* const* gst_meta_api_type_get_tags (GType api);
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/* some default tags */
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GST_EXPORT GQuark _gst_meta_tag_memory;
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/**
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* GST_META_TAG_MEMORY:
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*
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* Metadata tagged with this tag depends on the particular memory
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* or buffer that it is on.
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*
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* Deprecated: The GQuarks are not exported by any public API, use
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* GST_META_TAG_MEMORY_STR instead.
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*/
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#ifndef GST_DISABLE_DEPRECATED
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#define GST_META_TAG_MEMORY (_gst_meta_tag_memory)
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#endif
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G_END_DECLS
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#endif /* __GST_META_H__ */
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