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/* GStreamer Base Class for Tag Demuxing
* Copyright (C) 2005 Jan Schmidt <thaytan@mad.scientist.com>
* Copyright (C) 2006 Tim-Philipp Müller <tim centricular net>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#ifndef __GST_TAG_DEMUX_H__
#define __GST_TAG_DEMUX_H__
#include <gst/gst.h>
G_BEGIN_DECLS
#define GST_TYPE_TAG_DEMUX (gst_tag_demux_get_type())
#define GST_TAG_DEMUX(obj) (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_TAG_DEMUX,GstTagDemux))
#define GST_TAG_DEMUX_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_TAG_DEMUX,GstTagDemuxClass))
#define GST_IS_TAG_DEMUX(obj) (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_TAG_DEMUX))
#define GST_IS_TAG_DEMUX_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_TAG_DEMUX))
typedef struct _GstTagDemux GstTagDemux;
typedef struct _GstTagDemuxClass GstTagDemuxClass;
typedef struct _GstTagDemuxPrivate GstTagDemuxPrivate;
/**
* GstTagDemuxResult:
* @GST_TAG_DEMUX_RESULT_BROKEN_TAG: cannot parse tag, just skip it
* @GST_TAG_DEMUX_RESULT_AGAIN : call again with less or more data
* @GST_TAG_DEMUX_RESULT_OK : parsed tag successfully
*
* Result values from the parse_tag virtual function.
*/
typedef enum {
GST_TAG_DEMUX_RESULT_BROKEN_TAG,
GST_TAG_DEMUX_RESULT_AGAIN,
GST_TAG_DEMUX_RESULT_OK
} GstTagDemuxResult;
struct _GstTagDemux
{
GstElement element;
/* Minimum size required to identify a tag at the start and
* determine its total size (0 = not interested in start) */
guint min_start_size;
/* Minimum size required to identify a tag at the end and
* determine its total size (0 = not interested in end) */
guint min_end_size;
/* Prefer start tags over end tags (default: yes) */
gboolean prefer_start_tag;
/*< private >*/
gpointer reserved[GST_PADDING];
GstTagDemuxPrivate *priv;
};
/* Note: subclass must also add a sink pad template in its base_init */
struct _GstTagDemuxClass
{
GstElementClass parent_class;
/* vtable */
/* Identify tag and determine the size required to parse the tag. Buffer
* may be larger than the specified minimum size. */
gboolean (*identify_tag) (GstTagDemux * demux,
GstBuffer * buffer,
gboolean start_tag,
guint * tag_size);
/* Parse the tag. Buffer should be exactly the size determined by
* identify_tag() before. parse_tag() may change tag_size and return
* GST_TAG_DEMUX_RESULT_AGAIN to request a larger or smaller buffer.
* parse_tag() is also permitted to adjust tag_size to a smaller value
* and return GST_TAG_DEMUX_RESULT_OK. */
GstTagDemuxResult (*parse_tag) (GstTagDemux * demux,
GstBuffer * buffer,
gboolean start_tag,
guint * tag_size,
GstTagList ** tags);
/*< private >*/
gpointer reserved[GST_PADDING];
};
GType gst_tag_demux_get_type (void);
G_END_DECLS
#endif /* __GST_TAG_DEMUX_H__ */
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