gstreamer/gst/gstbuffer.h
Stefan Kost 3e1c4a2c42 inlined more doc comments, added missing comments and fixed comments fixed typos
Original commit message from CVS:
* docs/gst/gstreamer-sections.txt:
* docs/gst/tmpl/.cvsignore:
* docs/gst/tmpl/gstbin.sgml:
* docs/gst/tmpl/gstbuffer.sgml:
* gst/base/gstbasesrc.c:
* gst/gstbin.c: (gst_bin_get_type), (gst_bin_class_init):
* gst/gstbuffer.c:
* gst/gstbuffer.h:
* tools/gst-launch.1.in:
inlined more doc comments, added missing comments and fixed comments
fixed typos
2005-08-23 11:53:58 +00:00

360 lines
11 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/gstminiobject.h>
#include <gst/gstclock.h>
#include <gst/gstcaps.h>
G_BEGIN_DECLS
typedef struct _GstBuffer GstBuffer;
typedef struct _GstBufferClass GstBufferClass;
/**
* GST_BUFFER_TRACE_NAME:
*
* The name used for tracing memory allocations.
*/
#define GST_BUFFER_TRACE_NAME "GstBuffer"
#define GST_TYPE_BUFFER (gst_buffer_get_type())
#define GST_IS_BUFFER(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GST_TYPE_BUFFER))
#define GST_IS_BUFFER_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), GST_TYPE_BUFFER))
#define GST_BUFFER_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), GST_TYPE_BUFFER, GstBufferClass))
#define GST_BUFFER(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), GST_TYPE_BUFFER, GstBuffer))
#define GST_BUFFER_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), GST_TYPE_BUFFER, GstBufferClass))
#define GST_BUFFER_CAST(obj) ((GstBuffer *)(obj))
/**
* GST_BUFFER_FLAGS:
* @buf: a #GstBuffer to retrieve the flags from.
*
* Gets the flags from this buffer.
*
* Returns: the set of #GstBufferFlag items
*/
#define GST_BUFFER_FLAGS(buf) GST_MINI_OBJECT_FLAGS(buf)
/**
* GST_BUFFER_FLAG_IS_SET:
* @buf: a #GstBuffer to query flags of.
* @flag: the #GstBufferFlag to check.
*
* Gives the status of a given flag of a buffer.
*
* Returns: %TRUE if flag is set.
*/
#define GST_BUFFER_FLAG_IS_SET(buf,flag) GST_MINI_OBJECT_FLAG_IS_SET (buf, flag)
/**
* GST_BUFFER_FLAG_SET:
* @buf: a #GstBuffer to modify flags of.
* @flag: the #GstBufferFlag to set.
*
* Sets a buffer flag.
*/
#define GST_BUFFER_FLAG_SET(buf,flag) GST_MINI_OBJECT_FLAG_SET (buf, flag)
/**
* GST_BUFFER_FLAG_UNSET:
* @buf: a #GstBuffer to modify flags of.
* @flag: the #GstBufferFlag to clear.
*
* Clears a buffer flag.
*/
#define GST_BUFFER_FLAG_UNSET(buf,flag) GST_MINI_OBJECT_FLAG_UNSET (buf, flag)
/**
* GST_BUFFER_DATA:
* @buf: a #GstBuffer to get data pointer of.
*
* Retrieves a pointer to the data element of this buffer.
*
* Returns: the pointer to the actual data contents of the buffer.
*/
#define GST_BUFFER_DATA(buf) (GST_BUFFER_CAST(buf)->data)
/**
* GST_BUFFER_SIZE:
* @buf: a #GstBuffer to get data size of.
*
* Gets the size of the data in this buffer.
*
* Returns: the buffer size in bytes
*/
#define GST_BUFFER_SIZE(buf) (GST_BUFFER_CAST(buf)->size)
/**
* GST_BUFFER_TIMESTAMP:
* @buf: a #GstBuffer to get the timestamp of.:
*
* Gets the timestamp for this buffer.
*
* Returns: the timestamp for this buffer
*/
#define GST_BUFFER_TIMESTAMP(buf) (GST_BUFFER_CAST(buf)->timestamp)
/**
* GST_BUFFER_DURATION:
* @buf: a #GstBuffer to get the duration from.
*
* Gets the duration in nanoseconds of the data in the buffer.
* Value will be %GST_CLOCK_TIME_NONE if the duration is unknown.
*
* Returns: the duration of the buffer
*/
#define GST_BUFFER_DURATION(buf) (GST_BUFFER_CAST(buf)->duration)
/**
* GST_BUFFER_CAPS:
* @buf: a #GstBuffer to get the caps of.
*
* Gets the caps for this buffer.
*
* Returns: the #GstCaps for this buffer
*/
#define GST_BUFFER_CAPS(buf) (GST_BUFFER_CAST(buf)->caps)
/**
* GST_BUFFER_OFFSET:
* @buf: a #GstBuffer to get the offset of.
*
* Gets the offset in the source file of the beginning of this buffer.
*
* Returns: the start offset for this buffer
*/
#define GST_BUFFER_OFFSET(buf) (GST_BUFFER_CAST(buf)->offset)
/**
* GST_BUFFER_OFFSET_END:
* @buf: a #GstBuffer to get the offset of.
*
* Gets the offset in the source file of the end of this buffer.
*
* Returns: the end offset for this buffer
*/
#define GST_BUFFER_OFFSET_END(buf) (GST_BUFFER_CAST(buf)->offset_end)
/**
* GST_BUFFER_MALLOCDATA:
* @buf: a #GstBuffer to get access to the malloc_data field
*
* If the buffers data should be automatically freed by buffer management at the
* end of the buffers lifecycle, also set the data to the mallocdata field.
*/
#define GST_BUFFER_MALLOCDATA(buf) (GST_BUFFER_CAST(buf)->malloc_data)
/**
* GST_BUFFER_OFFSET_NONE:
*
* Constant for no-offset return results.
*/
#define GST_BUFFER_OFFSET_NONE ((guint64)-1)
/**
* GST_BUFFER_DURATION_IS_VALID:
* @buffer: the #GstBuffer to check for the duration
*
* Tests if the duration is known.
*
* Returns: %TRUE for success
*/
#define GST_BUFFER_DURATION_IS_VALID(buffer) (GST_CLOCK_TIME_IS_VALID (GST_BUFFER_DURATION (buffer)))
/**
* GST_BUFFER_TIMESTAMP_IS_VALID:
* @buffer: the #GstBuffer to check for the timestamp
*
* Tests if the timestamp is known.
*
* Returns: %TRUE for success
*/
#define GST_BUFFER_TIMESTAMP_IS_VALID(buffer) (GST_CLOCK_TIME_IS_VALID (GST_BUFFER_TIMESTAMP (buffer)))
/**
* GST_BUFFER_OFFSET_IS_VALID:
* @buffer: the #GstBuffer to check for the start offset
*
* Tests if the start offset is known.
*
* Returns: %TRUE for success
*/
#define GST_BUFFER_OFFSET_IS_VALID(buffer) (GST_BUFFER_OFFSET (buffer) != GST_BUFFER_OFFSET_NONE)
/**
* GST_BUFFER_OFFSET_END_IS_VALID:
* @buffer: the #GstBuffer to check for the end offset
*
* Tests if the end offset is known.
*
* Returns: %TRUE for success
*/
#define GST_BUFFER_OFFSET_END_IS_VALID(buffer) (GST_BUFFER_OFFSET_END (buffer) != GST_BUFFER_OFFSET_NONE)
/**
* GstBufferFlag:
* @GST_BUFFER_FLAG_READONLY: the buffer is read-only.
* @GST_BUFFER_FLAG_ORIGINAL: buffer is not a copy of another buffer.
* @GST_BUFFER_FLAG_PREROLL: the buffer is part of a preroll and should not be
* displayed.
* @GST_BUFFER_FLAG_DISCONT: the buffer marks a discontinuity in the stream.
* @GST_BUFFER_FLAG_IN_CAPS: the buffer has been added as a field in a #GstCaps.
* @GST_BUFFER_FLAG_GAP: the buffer has been created to fill a gap in the stream.
* @GST_BUFFER_FLAG_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_FLAG_READONLY = GST_MINI_OBJECT_FLAG_READONLY,
GST_BUFFER_FLAG_ORIGINAL = (GST_MINI_OBJECT_FLAG_LAST << 0), /* original data, not copied, not currently used */
GST_BUFFER_FLAG_PREROLL = (GST_MINI_OBJECT_FLAG_LAST << 1), /* sample should not be displayed */
GST_BUFFER_FLAG_DISCONT = (GST_MINI_OBJECT_FLAG_LAST << 2), /* buffer is first after discontinuity in the stream */
GST_BUFFER_FLAG_IN_CAPS = (GST_MINI_OBJECT_FLAG_LAST << 3), /* buffer is also part of caps */
GST_BUFFER_FLAG_GAP = (GST_MINI_OBJECT_FLAG_LAST << 4), /* buffer has been created to fill a gap in the stream */
GST_BUFFER_FLAG_DELTA_UNIT = (GST_MINI_OBJECT_FLAG_LAST << 5), /* can't be used as sync point in stream */
GST_BUFFER_FLAG_LAST = (GST_MINI_OBJECT_FLAG_LAST << 8)
} GstBufferFlag;
struct _GstBuffer {
GstMiniObject mini_object;
/*< public >*/ /* with COW */
/* pointer to data and its size */
guint8 *data; /* pointer to buffer data */
guint size; /* size of buffer data */
/* 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;
guint8 *malloc_data;
/*< private >*/
gpointer _gst_reserved[GST_PADDING];
};
struct _GstBufferClass {
GstMiniObjectClass mini_object_class;
};
/* allocation */
GType gst_buffer_get_type (void);
GstBuffer* gst_buffer_new (void);
GstBuffer* gst_buffer_new_and_alloc (guint size);
/**
* gst_buffer_set_data:
* @buf: The buffer to modify
* @data: The data to set on the buffer
* @size: The size to set on the buffer
*
* A convenience function to set the data and size on a buffer.
*/
#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 */
/**
* gst_buffer_ref:
* @buf: a #GstBuffer to increase the refcount of.
*
* Increases the refcount of the given buffer by one.
*/
#define gst_buffer_ref(buf) GST_BUFFER_CAST (gst_mini_object_ref (GST_MINI_OBJECT (buf)))
/**
* gst_buffer_unref:
* @buf: a #GstBuffer to decrease the refcount of.
*
* Decreases the refcount of the buffer. If the refcount reaches 0, the buffer
* will be freed.
*/
#define gst_buffer_unref(buf) gst_mini_object_unref (GST_MINI_OBJECT (buf))
/* copy buffer */
/**
* gst_buffer_copy:
* @buf: a #GstBuffer to copy.
*
* Copies the given buffer using the copy function of the parent #GstData
* structure.
*
* Returns: a new #GstBuffer copy of the buffer.
*/
#define gst_buffer_copy(buf) GST_BUFFER_CAST (gst_mini_object_copy (GST_MINI_OBJECT (buf)))
/**
* gst_buffer_is_writable:
* @buf: a #GstBuffer to check
*
* Tests if you can safely write data into a buffer's data array.
*
* Returns: %TRUE if buffer is writable
*/
#define gst_buffer_is_writable(buf) gst_mini_object_is_writable (GST_MINI_OBJECT (buf))
/**
* gst_buffer_make_writable:
* @buf: a #GstBuffer to make writable
*
* Makes a buffer writable.
*
* Returns: a #GstBuffer that is writable
*/
#define gst_buffer_make_writable(buf) GST_BUFFER_CAST (gst_mini_object_make_writable (GST_MINI_OBJECT (buf)))
/**
* gst_buffer_replace:
* @obuf: a #GstBuffer to receive the data
* @nbuf: a #GstBuffer to take the data from
*
* Replaces the data in @obuf with the one in @nbuf
*/
#define gst_buffer_replace(obuf,nbuf) gst_mini_object_replace ((GstMiniObject **)(obuf), GST_MINI_OBJECT (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);
#define gst_value_set_buffer(v,b) gst_value_set_mini_object(v, GST_MINI_OBJECT(b))
#define gst_value_take_buffer(v,b) gst_value_take_mini_object(v, GST_MINI_OBJECT(b))
#define gst_value_get_buffer(v) GST_BUFFER (gst_value_get_mini_object(v))
/* --- protected --- */
void _gst_buffer_initialize (void);
G_END_DECLS
#endif /* __GST_BUFFER_H__ */