gstreamer/gst/gstbuffer.h
David Schleef 85a63494bf Add padding to structures and objects
Original commit message from CVS:
Add padding to structures and objects
2003-10-07 21:58:42 +00:00

212 lines
8 KiB
C

/* 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>
G_BEGIN_DECLS
typedef struct _GstBuffer GstBuffer;
typedef struct _GstBufferPool GstBufferPool;
#define GST_BUFFER_TRACE_NAME "GstBuffer"
#define GST_BUFFER_POOL_TRACE_NAME "GstBufferPool"
extern GType _gst_buffer_type;
extern GType _gst_buffer_pool_type;
#define GST_TYPE_BUFFER (_gst_buffer_type)
#define GST_TYPE_BUFFER_POOL (_gst_buffer_pool_type)
#define GST_BUFFER(buf) ((GstBuffer *)(buf))
#define GST_BUFFER_POOL(pool) ((GstBufferPool *)(pool))
#define GST_IS_BUFFER(buf) (GST_DATA_TYPE(buf) == GST_TYPE_BUFFER)
#define GST_IS_BUFFER_POOL(buf) (GST_DATA_TYPE(buf) == GST_TYPE_BUFFER_POOL)
#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_FORMAT(buf) (GST_BUFFER(buf)->format)
#define GST_BUFFER_OFFSET(buf) (GST_BUFFER(buf)->offset)
#define GST_BUFFER_BUFFERPOOL(buf) (GST_BUFFER(buf)->pool)
#define GST_BUFFER_POOL_PRIVATE(buf) (GST_BUFFER(buf)->pool_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_MAXSIZE_IS_VALID(buffer) (GST_BUFFER_MAXSIZE (buffer) != GST_BUFFER_MAXSIZE_NONE)
typedef enum {
GST_BUFFER_READONLY = GST_DATA_READONLY,
GST_BUFFER_SUBBUFFER = GST_DATA_FLAG_LAST,
GST_BUFFER_ORIGINAL,
GST_BUFFER_DONTFREE,
GST_BUFFER_DISCONTINUOUS,
GST_BUFFER_KEY_UNIT,
GST_BUFFER_PREROLL,
GST_BUFFER_FLAG_LAST = GST_DATA_FLAG_LAST + 8
} GstBufferFlag;
struct _GstBuffer {
GstData data_type;
/* 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;
/* 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
*/
guint64 offset;
/* this is a pointer to the buffer pool (if any) */
GstBufferPool *pool;
/* pointer to pool private data of parent buffer in case of a subbuffer */
gpointer pool_private;
GST_STRUCT_PADDING
};
/* bufferpools */
typedef GstBuffer* (*GstBufferPoolBufferNewFunction) (GstBufferPool *pool, guint64 offset,
guint size, gpointer user_data);
typedef GstBuffer* (*GstBufferPoolBufferCopyFunction) (GstBufferPool *pool,
const GstBuffer *buffer,
gpointer user_data);
typedef void (*GstBufferPoolBufferFreeFunction) (GstBufferPool *pool,
GstBuffer *buffer,
gpointer user_data);
struct _GstBufferPool {
GstData data;
gboolean active;
GstBufferPoolBufferNewFunction buffer_new;
GstBufferPoolBufferCopyFunction buffer_copy;
GstBufferPoolBufferFreeFunction buffer_free;
gpointer user_data;
GST_STRUCT_PADDING
};
/* allocation */
GType gst_buffer_get_type (void);
GstBuffer* gst_buffer_new (void);
GstBuffer* gst_buffer_new_and_alloc (guint size);
/* creating a new buffer from a pool */
GstBuffer* gst_buffer_new_from_pool (GstBufferPool *pool,
guint64 offset, 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_free(buf) gst_data_free (GST_DATA (buf))
/* creating a subbuffer */
GstBuffer* gst_buffer_create_sub (GstBuffer *parent, guint offset, guint size);
/* merge, span, or append two buffers, intelligently */
GstBuffer* gst_buffer_merge (GstBuffer *buf1, GstBuffer *buf2);
gboolean gst_buffer_is_span_fast (GstBuffer *buf1, GstBuffer *buf2);
GstBuffer* gst_buffer_span (GstBuffer *buf1, guint32 offset, GstBuffer *buf2, guint32 len);
/* --- private --- */
void _gst_buffer_initialize (void);
/* functions used by subclasses and bufferpools */
void gst_buffer_default_free (GstBuffer *buffer);
GstBuffer* gst_buffer_default_copy (GstBuffer *buffer);
/* creating a new buffer pools */
GType gst_buffer_pool_get_type (void);
GstBufferPool* gst_buffer_pool_new (GstDataFreeFunction free,
GstDataCopyFunction copy,
GstBufferPoolBufferNewFunction buffer_new,
GstBufferPoolBufferCopyFunction buffer_copy,
GstBufferPoolBufferFreeFunction buffer_free,
gpointer user_data);
/* function used by subclasses and bufferpools */
void gst_buffer_pool_default_free (GstBufferPool *pool);
/* check if pool is usable */
gboolean gst_buffer_pool_is_active (GstBufferPool *pool);
void gst_buffer_pool_set_active (GstBufferPool *pool, gboolean active);
#define gst_buffer_pool_ref(pool) GST_BUFFER_POOL (gst_data_ref (GST_DATA (pool)))
#define gst_buffer_pool_ref_by_count(pool,c) GST_BUFFER_POOL (gst_data_ref_by_count (GST_DATA (pool), c))
#define gst_buffer_pool_unref(pool) gst_data_unref (GST_DATA (pool))
/* bufferpool operations */
#define gst_buffer_pool_copy(pool) GST_BUFFER_POOL (gst_data_copy (GST_DATA (pool)))
#define gst_buffer_pool_is_writable(pool) GST_BUFFER_POOL (gst_data_is_writable (GST_DATA (pool)))
#define gst_buffer_pool_copy_on_write(pool) GST_BUFFER_POOL (gst_data_copy_on_write (GST_DATA (pool)))
#define gst_buffer_pool_free(pool) gst_data_free (GST_DATA (pool))
void gst_buffer_pool_set_user_data (GstBufferPool *pool, gpointer user_data);
gpointer gst_buffer_pool_get_user_data (GstBufferPool *pool);
G_END_DECLS
#endif /* __GST_BUFFER_H__ */