gstreamer/gst/gstbuffer.h

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/* GStreamer
* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
* 2000 Wim Taymans <wtay@chello.be>
*
* gstbuffer.h: Header for GstBuffer object
*
* 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_BUFFER_H__
#define __GST_BUFFER_H__
#include <gst/gstdata.h>
#include <gst/gstclock.h>
#include <gst/gstcaps.h>
G_BEGIN_DECLS
typedef struct _GstBuffer GstBuffer;
typedef void (*GstBufferFreeDataFunc) (GstBuffer *buffer);
#define GST_BUFFER_TRACE_NAME "GstBuffer"
extern GType _gst_buffer_type;
#define GST_TYPE_BUFFER (gst_buffer_get_type())
#define GST_BUFFER(buf) ((GstBuffer *)(buf))
#define GST_IS_BUFFER(buf) (GST_DATA_TYPE(buf) == GST_TYPE_BUFFER)
#define GST_BUFFER_REFCOUNT(buf) GST_DATA_REFCOUNT(buf)
#define GST_BUFFER_REFCOUNT_VALUE(buf) GST_DATA_REFCOUNT_VALUE(buf)
#define GST_BUFFER_COPY_FUNC(buf) GST_DATA_COPY_FUNC(buf)
#define GST_BUFFER_FREE_FUNC(buf) GST_DATA_FREE_FUNC(buf)
#define GST_BUFFER_FLAGS(buf) GST_DATA_FLAGS(buf)
#define GST_BUFFER_FLAG_IS_SET(buf,flag) GST_DATA_FLAG_IS_SET (buf, flag)
#define GST_BUFFER_FLAG_SET(buf,flag) GST_DATA_FLAG_SET (buf, flag)
#define GST_BUFFER_FLAG_UNSET(buf,flag) GST_DATA_FLAG_UNSET (buf, flag)
#define GST_BUFFER_DATA(buf) (GST_BUFFER(buf)->data)
#define GST_BUFFER_SIZE(buf) (GST_BUFFER(buf)->size)
#define GST_BUFFER_MAXSIZE(buf) (GST_BUFFER(buf)->maxsize)
#define GST_BUFFER_TIMESTAMP(buf) (GST_BUFFER(buf)->timestamp)
#define GST_BUFFER_DURATION(buf) (GST_BUFFER(buf)->duration)
#define GST_BUFFER_CAPS(buf) (GST_BUFFER(buf)->caps)
#define GST_BUFFER_OFFSET(buf) (GST_BUFFER(buf)->offset)
#define GST_BUFFER_OFFSET_END(buf) (GST_BUFFER(buf)->offset_end)
#define GST_BUFFER_FREE_DATA_FUNC(buf) (GST_BUFFER(buf)->free_data)
#define GST_BUFFER_PRIVATE(buf) (GST_BUFFER(buf)->buffer_private)
#define GST_BUFFER_OFFSET_NONE ((guint64)-1)
#define GST_BUFFER_MAXSIZE_NONE ((guint)0)
#define GST_BUFFER_DURATION_IS_VALID(buffer) (GST_CLOCK_TIME_IS_VALID (GST_BUFFER_DURATION (buffer)))
#define GST_BUFFER_TIMESTAMP_IS_VALID(buffer) (GST_CLOCK_TIME_IS_VALID (GST_BUFFER_TIMESTAMP (buffer)))
#define GST_BUFFER_OFFSET_IS_VALID(buffer) (GST_BUFFER_OFFSET (buffer) != GST_BUFFER_OFFSET_NONE)
#define GST_BUFFER_OFFSET_END_IS_VALID(buffer) (GST_BUFFER_OFFSET_END (buffer) != GST_BUFFER_OFFSET_NONE)
#define GST_BUFFER_MAXSIZE_IS_VALID(buffer) (GST_BUFFER_MAXSIZE (buffer) != GST_BUFFER_MAXSIZE_NONE)
/**
* GstBufferFlag:
* @GST_BUFFER_READONLY: the buffer is read-only.
* @GST_BUFFER_SUBBUFFER: the buffer is a subbuffer, the parent buffer can be
* found with the GST_BUFFER_POOL_PRIVATE() macro.
* @GST_BUFFER_ORIGINAL: buffer is not a copy of another buffer.
* @GST_BUFFER_DONTFREE: do not try to free the data when this buffer is
* unreferenced.
* @GST_BUFFER_PREROLL: the buffer is part of a preroll and should not be
* displayed.
* @GST_BUFFER_DISCONT: the buffer marks a discontinuity in the stream.
* @GST_BUFFER_IN_CAPS: the buffer has been added as a field in a #GstCaps.
* @GST_BUFFER_GAP: the buffer has been created to fill a gap in the stream.
* @GST_BUFFER_DELTA_UNIT: this unit cannot be decoded independently.
* Since 0.8.5
* @GST_BUFFER_FLAG_LAST: additional flags can be added starting from this flag.
*
* A set of buffer flags used to describe properties of a #GstBuffer.
*/
typedef enum {
GST_BUFFER_READONLY = GST_DATA_READONLY,
GST_BUFFER_SUBBUFFER = GST_DATA_FLAG_LAST,
GST_BUFFER_ORIGINAL, /* original data, not copied, not currently used */
GST_BUFFER_DONTFREE, /* buffer data is managed by somebody else and cannot be freeed */
GST_BUFFER_PREROLL, /* sample should not be displayed */
GST_BUFFER_DISCONT, /* buffer is first after discontinuity in the stream */
GST_BUFFER_IN_CAPS, /* buffer is also part of caps */
GST_BUFFER_GAP, /* buffer has been created to fill a gap in the stream */
GST_BUFFER_DELTA_UNIT, /* can't be used as sync point in stream */
GST_BUFFER_FLAG_LAST = GST_DATA_FLAG_LAST + 8
} GstBufferFlag;
struct _GstBuffer {
GstData data_type;
/*< public >*/ /* with COW */
/* pointer to data and its size */
guint8 *data; /* pointer to buffer data */
guint size; /* size of buffer data */
guint maxsize; /* max size of this buffer */
/* timestamp */
GstClockTime timestamp;
GstClockTime duration;
/* the media type of this buffer */
GstCaps *caps;
/* media specific offset
* for video frames, this could be the number of frames,
* for audio data, this could be the number of audio samples,
* for file data or compressed data, this could be the number of bytes
* offset_end is the last offset contained in the buffer. The format specifies
* the meaning of both of them exactly.
*/
guint64 offset;
guint64 offset_end;
/*< protected >*/
GstBufferFreeDataFunc free_data;
gpointer buffer_private;
/*< private >*/
gpointer _gst_reserved[GST_PADDING];
};
/* allocation */
GType gst_buffer_get_type (void);
GstBuffer* gst_buffer_new (void);
GstBuffer* gst_buffer_new_and_alloc (guint size);
#define gst_buffer_set_data(buf, data, size) \
G_STMT_START { \
GST_BUFFER_DATA (buf) = data; \
GST_BUFFER_SIZE (buf) = size; \
} G_STMT_END
/* refcounting */
#define gst_buffer_ref(buf) GST_BUFFER (gst_data_ref (GST_DATA (buf)))
#define gst_buffer_ref_by_count(buf,c) GST_BUFFER (gst_data_ref_by_count (GST_DATA (buf), c))
#define gst_buffer_unref(buf) gst_data_unref (GST_DATA (buf))
/* copy buffer */
#define gst_buffer_copy(buf) GST_BUFFER (gst_data_copy (GST_DATA (buf)))
#define gst_buffer_is_writable(buf) gst_data_is_writable (GST_DATA (buf))
#define gst_buffer_copy_on_write(buf) GST_BUFFER (gst_data_copy_on_write (GST_DATA (buf)))
#define gst_buffer_replace(obuf,nbuf) gst_data_replace ((GstData **)(obuf), GST_DATA (nbuf))
GstCaps* gst_buffer_get_caps (GstBuffer *buffer);
void gst_buffer_set_caps (GstBuffer *buffer, GstCaps *caps);
/* creating a subbuffer */
GstBuffer* gst_buffer_create_sub (GstBuffer *parent, guint offset, guint size);
/* span, two buffers, intelligently */
gboolean gst_buffer_is_span_fast (GstBuffer *buf1, GstBuffer *buf2);
GstBuffer* gst_buffer_span (GstBuffer *buf1, guint32 offset, GstBuffer *buf2, guint32 len);
/* --- protected --- */
void _gst_buffer_initialize (void);
void gst_buffer_default_free (GstBuffer *buffer);
GstBuffer* gst_buffer_default_copy (GstBuffer *buffer);
G_END_DECLS
#endif /* __GST_BUFFER_H__ */