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