gstreamer/libs/gst/base/gstbitreader.h

101 lines
3.6 KiB
C

/* GStreamer
*
* Copyright (C) 2008 Sebastian Dröge <sebastian.droege@collabora.co.uk>.
*
* 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_BIT_READER_H__
#define __GST_BIT_READER_H__
#include <gst/gst.h>
/* FIXME: inline functions */
G_BEGIN_DECLS
/**
* GstBitReader:
* @data: Data from which the bit reader will read
* @size: Size of @data in bytes
* @byte: Current byte position
* @bit: Bit position in the current byte
*
* A bit reader instance.
*/
typedef struct {
const guint8 *data;
guint size;
guint byte; /* Byte position */
guint bit; /* Bit position in the current byte */
} GstBitReader;
GstBitReader * gst_bit_reader_new (const guint8 *data, guint size);
GstBitReader * gst_bit_reader_new_from_buffer (const GstBuffer *buffer);
void gst_bit_reader_free (GstBitReader *reader);
void gst_bit_reader_init (GstBitReader *reader, const guint8 *data, guint size);
void gst_bit_reader_init_from_buffer (GstBitReader *reader, const GstBuffer *buffer);
gboolean gst_bit_reader_set_pos (GstBitReader *reader, guint pos);
guint gst_bit_reader_get_pos (const GstBitReader *reader);
guint gst_bit_reader_get_remaining (const GstBitReader *reader);
gboolean gst_bit_reader_skip (GstBitReader *reader, guint nbits);
gboolean gst_bit_reader_skip_to_byte (GstBitReader *reader);
gboolean gst_bit_reader_get_bits_uint8 (GstBitReader *reader, guint8 *val, guint nbits);
gboolean gst_bit_reader_get_bits_uint16 (GstBitReader *reader, guint16 *val, guint nbits);
gboolean gst_bit_reader_get_bits_uint32 (GstBitReader *reader, guint32 *val, guint nbits);
gboolean gst_bit_reader_get_bits_uint64 (GstBitReader *reader, guint64 *val, guint nbits);
gboolean gst_bit_reader_peek_bits_uint8 (const GstBitReader *reader, guint8 *val, guint nbits);
gboolean gst_bit_reader_peek_bits_uint16 (const GstBitReader *reader, guint16 *val, guint nbits);
gboolean gst_bit_reader_peek_bits_uint32 (const GstBitReader *reader, guint32 *val, guint nbits);
gboolean gst_bit_reader_peek_bits_uint64 (const GstBitReader *reader, guint64 *val, guint nbits);
/**
* GST_BIT_READER_INIT:
* @data: Data from which the #GstBitReader should read
* @size: Size of @data in bytes
*
* A #GstBitReader must be initialized with this macro, before it can be
* used. This macro can used be to initialize a variable, but it cannot
* be assigned to a variable. In that case you have to use
* gst_bit_reader_init().
*
* Since: 0.10.22
*/
#define GST_BIT_READER_INIT(data, size) {data, size, 0, 0}
/**
* GST_BIT_READER_INIT_FROM_BUFFER:
* @buffer: Buffer from which the #GstBitReader should read
*
* A #GstBitReader must be initialized with this macro, before it can be
* used. This macro can used be to initialize a variable, but it cannot
* be assigned to a variable. In that case you have to use
* gst_bit_reader_init().
*
* Since: 0.10.22
*/
#define GST_BIT_READER_INIT_FROM_BUFFER(buffer) {GST_BUFFER_DATA (buffer), GST_BUFFER_SIZE (buffer), 0, 0}
G_END_DECLS
#endif /* __GST_BIT_READER_H__ */