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171 lines
5 KiB
C
171 lines
5 KiB
C
/* GStreamer
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* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
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* 2000 Wim Taymans <wtay@chello.be>
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*
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* gstbuffer.h: Header for GstBuffer object
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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_BUFFER_H__
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#define __GST_BUFFER_H__
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//
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// Define this to add file:line info to each GstBuffer showing
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// the location in the source code where the buffer was created.
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//
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// #define GST_BUFFER_WHERE
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//
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// Then in gdb, you can `call gst_buffer_print_live()' to get a list
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// of allocated GstBuffers and also the file:line where they were
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// allocated.
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//
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#include <gst/gstdata.h>
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#ifdef HAVE_ATOMIC_H
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#include <asm/atomic.h>
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#endif
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#ifdef __cplusplus
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extern "C" {
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#endif /* __cplusplus */
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extern GType _gst_buffer_type;
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#define GST_TYPE_BUFFER (_gst_buffer_type)
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#define GST_BUFFER(buf) ((GstBuffer *)(buf))
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#define GST_IS_BUFFER(buf) (GST_DATA_TYPE(buf) == GST_TYPE_BUFFER)
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#define GST_BUFFER_FLAGS(buf) (GST_BUFFER(buf)->flags)
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#define GST_BUFFER_FLAG_IS_SET(buf,flag) (GST_BUFFER_FLAGS(buf) & (1<<(flag)))
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#define GST_BUFFER_FLAG_SET(buf,flag) G_STMT_START{ (GST_BUFFER_FLAGS(buf) |= (1<<(flag))); }G_STMT_END
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#define GST_BUFFER_FLAG_UNSET(buf,flag) G_STMT_START{ (GST_BUFFER_FLAGS(buf) &= ~(1<<(flag))); }G_STMT_END
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#define GST_BUFFER_DATA(buf) (GST_BUFFER(buf)->data)
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#define GST_BUFFER_SIZE(buf) (GST_BUFFER(buf)->size)
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#define GST_BUFFER_OFFSET(buf) (GST_BUFFER(buf)->offset)
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#define GST_BUFFER_MAXSIZE(buf) (GST_BUFFER(buf)->maxsize)
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#define GST_BUFFER_TIMESTAMP(buf) (GST_BUFFER(buf)->timestamp)
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#define GST_BUFFER_MAXAGE(buf) (GST_BUFFER(buf)->maxage)
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#define GST_BUFFER_BUFFERPOOL(buf) (GST_BUFFER(buf)->pool)
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#define GST_BUFFER_PARENT(buf) (GST_BUFFER(buf)->parent)
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#define GST_BUFFER_POOL_PRIVATE(buf) (GST_BUFFER(buf)->pool_private)
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#define GST_BUFFER_COPY_FUNC(buf) (GST_BUFFER(buf)->copy)
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#define GST_BUFFER_FREE_FUNC(buf) (GST_BUFFER(buf)->free)
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#define GST_BUFFER_LOCK(buf) (g_mutex_lock(GST_BUFFER(buf)->lock))
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#define GST_BUFFER_TRYLOCK(buf) (g_mutex_trylock(GST_BUFFER(buf)->lock))
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#define GST_BUFFER_UNLOCK(buf) (g_mutex_unlock(GST_BUFFER(buf)->lock))
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typedef enum {
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GST_BUFFER_READONLY,
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GST_BUFFER_ORIGINAL,
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GST_BUFFER_DONTFREE,
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} GstBufferFlags;
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typedef struct _GstBuffer GstBuffer;
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typedef void (*GstBufferFreeFunc) (GstBuffer *buf);
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typedef GstBuffer *(*GstBufferCopyFunc) (GstBuffer *srcbuf);
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#include <gst/gstbufferpool.h>
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struct _GstBuffer {
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GstData data_type;
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/* locking */
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GMutex *lock;
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/* refcounting */
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#ifdef HAVE_ATOMIC_H
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atomic_t refcount;
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#define GST_BUFFER_REFCOUNT(buf) (atomic_read(&(GST_BUFFER((buf))->refcount)))
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#else
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int refcount;
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#define GST_BUFFER_REFCOUNT(buf) (GST_BUFFER(buf)->refcount)
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#endif
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/* flags */
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guint16 flags;
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/* pointer to data, its size, and offset in original source if known */
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guchar *data;
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guint32 size;
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guint32 maxsize;
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guint32 offset;
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/* timestamp */
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gint64 timestamp;
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gint64 maxage;
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/* subbuffer support, who's my parent? */
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GstBuffer *parent;
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/* this is a pointer to the buffer pool (if any) */
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GstBufferPool *pool;
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gpointer pool_private;
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/* utility function pointers */
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GstBufferFreeFunc free; // free the data associated with the buffer
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GstBufferCopyFunc copy; // copy the data from one buffer to another
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};
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/* initialisation */
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void _gst_buffer_initialize (void);
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/* creating a new buffer from scratch */
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GstBuffer* gst_buffer_new (void);
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GstBuffer* gst_buffer_new_from_pool (GstBufferPool *pool, guint32 offset, guint32 size);
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/* creating a subbuffer */
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GstBuffer* gst_buffer_create_sub (GstBuffer *parent, guint32 offset, guint32 size);
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/* refcounting */
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void gst_buffer_ref (GstBuffer *buffer);
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void gst_buffer_unref (GstBuffer *buffer);
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/* destroying the buffer */
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void gst_buffer_destroy (GstBuffer *buffer);
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/* copy buffer */
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GstBuffer* gst_buffer_copy (GstBuffer *buffer);
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/* merge, span, or append two buffers, intelligently */
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GstBuffer* gst_buffer_merge (GstBuffer *buf1, GstBuffer *buf2);
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GstBuffer* gst_buffer_span (GstBuffer *buf1,guint32 offset,GstBuffer *buf2,guint32 len);
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GstBuffer* gst_buffer_append (GstBuffer *buf, GstBuffer *buf2);
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gboolean gst_buffer_is_span_fast (GstBuffer *buf1, GstBuffer *buf2);
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#ifdef __cplusplus
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}
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#endif /* __cplusplus */
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#endif /* __GST_BUFFER_H__ */
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