2 * Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
3 * 2000 Wim Taymans <wtay@chello.be>
5 * gstbuffer.h: Header for GstBuffer object
7 * This library is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Library General Public
9 * License as published by the Free Software Foundation; either
10 * version 2 of the License, or (at your option) any later version.
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Library General Public License for more details.
17 * You should have received a copy of the GNU Library General Public
18 * License along with this library; if not, write to the
19 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
20 * Boston, MA 02111-1307, USA.
24 #ifndef __GST_BUFFER_H__
25 #define __GST_BUFFER_H__
27 #include <gst/gstdata.h>
28 #include <gst/gstclock.h>
29 #include <gst/gstcaps.h>
33 typedef struct _GstBuffer GstBuffer;
35 typedef void (*GstBufferFreeDataFunc) (GstBuffer *buffer);
37 #define GST_BUFFER_TRACE_NAME "GstBuffer"
39 extern GType _gst_buffer_type;
41 #define GST_TYPE_BUFFER (gst_buffer_get_type())
43 #define GST_BUFFER(buf) ((GstBuffer *)(buf))
44 #define GST_IS_BUFFER(buf) (GST_DATA_TYPE(buf) == GST_TYPE_BUFFER)
46 #define GST_BUFFER_REFCOUNT(buf) GST_DATA_REFCOUNT(buf)
47 #define GST_BUFFER_REFCOUNT_VALUE(buf) GST_DATA_REFCOUNT_VALUE(buf)
48 #define GST_BUFFER_COPY_FUNC(buf) GST_DATA_COPY_FUNC(buf)
49 #define GST_BUFFER_FREE_FUNC(buf) GST_DATA_FREE_FUNC(buf)
51 #define GST_BUFFER_FLAGS(buf) GST_DATA_FLAGS(buf)
52 #define GST_BUFFER_FLAG_IS_SET(buf,flag) GST_DATA_FLAG_IS_SET (buf, flag)
53 #define GST_BUFFER_FLAG_SET(buf,flag) GST_DATA_FLAG_SET (buf, flag)
54 #define GST_BUFFER_FLAG_UNSET(buf,flag) GST_DATA_FLAG_UNSET (buf, flag)
56 #define GST_BUFFER_DATA(buf) (GST_BUFFER(buf)->data)
57 #define GST_BUFFER_SIZE(buf) (GST_BUFFER(buf)->size)
58 #define GST_BUFFER_MAXSIZE(buf) (GST_BUFFER(buf)->maxsize)
59 #define GST_BUFFER_TIMESTAMP(buf) (GST_BUFFER(buf)->timestamp)
60 #define GST_BUFFER_DURATION(buf) (GST_BUFFER(buf)->duration)
61 #define GST_BUFFER_CAPS(buf) (GST_BUFFER(buf)->caps)
62 #define GST_BUFFER_OFFSET(buf) (GST_BUFFER(buf)->offset)
63 #define GST_BUFFER_OFFSET_END(buf) (GST_BUFFER(buf)->offset_end)
64 #define GST_BUFFER_FREE_DATA_FUNC(buf) (GST_BUFFER(buf)->free_data)
65 #define GST_BUFFER_PRIVATE(buf) (GST_BUFFER(buf)->buffer_private)
67 #define GST_BUFFER_OFFSET_NONE ((guint64)-1)
68 #define GST_BUFFER_MAXSIZE_NONE ((guint)0)
70 #define GST_BUFFER_DURATION_IS_VALID(buffer) (GST_CLOCK_TIME_IS_VALID (GST_BUFFER_DURATION (buffer)))
71 #define GST_BUFFER_TIMESTAMP_IS_VALID(buffer) (GST_CLOCK_TIME_IS_VALID (GST_BUFFER_TIMESTAMP (buffer)))
72 #define GST_BUFFER_OFFSET_IS_VALID(buffer) (GST_BUFFER_OFFSET (buffer) != GST_BUFFER_OFFSET_NONE)
73 #define GST_BUFFER_OFFSET_END_IS_VALID(buffer) (GST_BUFFER_OFFSET_END (buffer) != GST_BUFFER_OFFSET_NONE)
74 #define GST_BUFFER_MAXSIZE_IS_VALID(buffer) (GST_BUFFER_MAXSIZE (buffer) != GST_BUFFER_MAXSIZE_NONE)
78 * @GST_BUFFER_READONLY: the buffer is read-only.
79 * @GST_BUFFER_SUBBUFFER: the buffer is a subbuffer, the parent buffer can be
80 * found with the GST_BUFFER_POOL_PRIVATE() macro.
81 * @GST_BUFFER_ORIGINAL: buffer is not a copy of another buffer.
82 * @GST_BUFFER_DONTFREE: do not try to free the data when this buffer is
84 * @GST_BUFFER_KEY_UNIT: the buffer holds a key unit, a unit that can be
85 * decoded independently of other buffers.
86 * This flag has been deprecated, see #GST_BUFFER_DELTA_UNIT.
87 * @GST_BUFFER_DONTKEEP: the buffer should not be ref()ed, but copied instead
88 * before doing anything with it (for specially allocated hw buffers and such)
89 * @GST_BUFFER_IN_CAPS: the buffer has been added as a field in a #GstCaps.
90 * @GST_BUFFER_GAP: the buffer has been created to fill a gap in the stream.
91 * @GST_BUFFER_DELTA_UNIT: this unit cannot be decoded independently.
93 * @GST_BUFFER_FLAG_LAST: additional flags can be added starting from this flag.
95 * A set of buffer flags used to describe properties of a #GstBuffer.
98 GST_BUFFER_READONLY = GST_DATA_READONLY,
99 GST_BUFFER_SUBBUFFER = GST_DATA_FLAG_LAST,
100 GST_BUFFER_ORIGINAL, /* original data, not copied, not currently used */
101 GST_BUFFER_DONTFREE, /* buffer data is managed by somebody else and cannot be freeed */
102 GST_BUFFER_PREROLL, /* sample should not be displayed */
103 GST_BUFFER_DISCONT, /* buffer is first after discontinuity in the stream */
104 GST_BUFFER_IN_CAPS, /* buffer is also part of caps */
105 GST_BUFFER_GAP, /* buffer has been created to fill a gap in the stream */
106 GST_BUFFER_DELTA_UNIT, /* can't be used as sync point in stream */
107 GST_BUFFER_FLAG_LAST = GST_DATA_FLAG_LAST + 8
113 /*< public >*/ /* with COW */
114 /* pointer to data and its size */
115 guint8 *data; /* pointer to buffer data */
116 guint size; /* size of buffer data */
117 guint maxsize; /* max size of this buffer */
120 GstClockTime timestamp;
121 GstClockTime duration;
123 /* the media type of this buffer */
126 /* media specific offset
127 * for video frames, this could be the number of frames,
128 * for audio data, this could be the number of audio samples,
129 * for file data or compressed data, this could be the number of bytes
130 * offset_end is the last offset contained in the buffer. The format specifies
131 * the meaning of both of them exactly.
137 GstBufferFreeDataFunc free_data;
138 gpointer buffer_private;
141 gpointer _gst_reserved[GST_PADDING];
145 GType gst_buffer_get_type (void);
146 GstBuffer* gst_buffer_new (void);
147 GstBuffer* gst_buffer_new_and_alloc (guint size);
149 #define gst_buffer_set_data(buf, data, size) \
151 GST_BUFFER_DATA (buf) = data; \
152 GST_BUFFER_SIZE (buf) = size; \
156 #define gst_buffer_ref(buf) GST_BUFFER (gst_data_ref (GST_DATA (buf)))
157 #define gst_buffer_ref_by_count(buf,c) GST_BUFFER (gst_data_ref_by_count (GST_DATA (buf), c))
158 #define gst_buffer_unref(buf) gst_data_unref (GST_DATA (buf))
160 #define gst_buffer_copy(buf) GST_BUFFER (gst_data_copy (GST_DATA (buf)))
161 #define gst_buffer_is_writable(buf) gst_data_is_writable (GST_DATA (buf))
162 #define gst_buffer_copy_on_write(buf) GST_BUFFER (gst_data_copy_on_write (GST_DATA (buf)))
164 GstCaps* gst_buffer_get_caps (GstBuffer *buffer);
165 void gst_buffer_set_caps (GstBuffer *buffer, GstCaps *caps);
167 /* creating a subbuffer */
168 GstBuffer* gst_buffer_create_sub (GstBuffer *parent, guint offset, guint size);
170 /* span, two buffers, intelligently */
171 gboolean gst_buffer_is_span_fast (GstBuffer *buf1, GstBuffer *buf2);
172 GstBuffer* gst_buffer_span (GstBuffer *buf1, guint32 offset, GstBuffer *buf2, guint32 len);
174 /* --- protected --- */
175 void _gst_buffer_initialize (void);
177 void gst_buffer_default_free (GstBuffer *buffer);
178 GstBuffer* gst_buffer_default_copy (GstBuffer *buffer);
182 #endif /* __GST_BUFFER_H__ */