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9339a59583
Add a GType to the metadata to identify the GstMetaInfo. We can remove the (de)serialize functions for the metadata because we can register GTtype transform functions between various types to implement serialization later.
143 lines
4.6 KiB
C
143 lines
4.6 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., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, 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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G_BEGIN_DECLS
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typedef struct _GstMeta GstMeta;
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typedef struct _GstMetaInfo GstMetaInfo;
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/**
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* GstMeta:
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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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const GstMetaInfo *info;
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};
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/**
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* GST_META_TRACE_NAME:
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*
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* The name used for tracing memory allocations.
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*/
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#define GST_META_TRACE_NAME "GstMeta"
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/**
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* GstMetaInitFunction:
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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 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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typedef void (*GstMetaCopyFunction) (GstBuffer *dest, GstMeta *meta,
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GstBuffer *buffer, gsize offset, gsize size);
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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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* @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.
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*
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* Implementations should check the type of the transform @data and parse
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* additional type specific field that should be used to perform the transform.
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*/
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typedef void (*GstMetaTransformFunction) (GstBuffer *transbuf, GstMeta *meta,
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GstBuffer *buffer, gpointer data);
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/**
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* GstMetaInfo:
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* @api: tag indentifying the metadata structure and api
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* @type: type indentifying 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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* @copy_func: function for copying 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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GQuark 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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GstMetaCopyFunction copy_func;
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GstMetaTransformFunction transform_func;
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};
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void _gst_meta_init (void);
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const GstMetaInfo * gst_meta_register (const gchar *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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GstMetaCopyFunction copy_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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/* default metadata */
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/* timing metadata */
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typedef struct _GstMetaTiming GstMetaTiming;
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const GstMetaInfo *gst_meta_timing_get_info(void);
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#define GST_META_TIMING_INFO (gst_meta_timing_get_info())
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struct _GstMetaTiming {
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GstMeta meta; /* common meta header */
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GstClockTime dts; /* decoding timestamp */
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GstClockTime pts; /* presentation timestamp */
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GstClockTime duration; /* duration of the data */
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GstClockTime clock_rate; /* clock rate for the above values */
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};
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#define gst_buffer_get_meta_timing(b) ((GstMetaTiming*)gst_buffer_get_meta((b),GST_META_TIMING_INFO))
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#define gst_buffer_add_meta_timing(b) ((GstMetaTiming*)gst_buffer_add_meta((b),GST_META_TIMING_INFO,NULL))
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G_END_DECLS
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#endif /* __GST_META_H__ */
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