mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2024-12-22 08:17:01 +00:00
95 lines
2.6 KiB
C
95 lines
2.6 KiB
C
/*****************************************************************************
|
|
* bits.h
|
|
*****************************************************************************
|
|
* Copyright (C) 2001, 2002 the VideoLAN team
|
|
* $Id$
|
|
*
|
|
* Authors: Laurent Aimar <fenrir@via.ecp.fr>
|
|
* Eric Petit <titer@videolan.org>
|
|
*
|
|
* Copyright (C) 2008 Lin YANG <oxcsnicho@gmail.com>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program 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 General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
|
|
*****************************************************************************/
|
|
|
|
#ifndef __BITS_H__
|
|
#define __BITS_H__
|
|
|
|
#include <glib.h>
|
|
|
|
G_BEGIN_DECLS
|
|
typedef struct bits_buffer_s
|
|
{
|
|
gint i_size;
|
|
|
|
gint i_data;
|
|
guint8 i_mask;
|
|
guint8* p_data;
|
|
|
|
} bits_buffer_t;
|
|
|
|
static inline gint bits_initwrite( bits_buffer_t *p_buffer,
|
|
gint i_size, void *p_data )
|
|
{
|
|
p_buffer->i_size = i_size;
|
|
p_buffer->i_data = 0;
|
|
p_buffer->i_mask = 0x80;
|
|
p_buffer->p_data = p_data;
|
|
if( !p_buffer->p_data )
|
|
{
|
|
if( !( p_buffer->p_data = g_malloc0( i_size ) ) )
|
|
return -1;
|
|
}
|
|
p_buffer->p_data[0] = 0;
|
|
return 0;
|
|
}
|
|
|
|
static inline void bits_align( bits_buffer_t *p_buffer )
|
|
{
|
|
if( p_buffer->i_mask != 0x80 && p_buffer->i_data < p_buffer->i_size )
|
|
{
|
|
p_buffer->i_mask = 0x80;
|
|
p_buffer->i_data++;
|
|
p_buffer->p_data[p_buffer->i_data] = 0x00;
|
|
}
|
|
}
|
|
|
|
static inline void bits_write( bits_buffer_t *p_buffer,
|
|
gint i_count, guint64 i_bits )
|
|
{
|
|
while( i_count > 0 )
|
|
{
|
|
i_count--;
|
|
|
|
if( ( i_bits >> i_count )&0x01 )
|
|
{
|
|
p_buffer->p_data[p_buffer->i_data] |= p_buffer->i_mask;
|
|
}
|
|
else
|
|
{
|
|
p_buffer->p_data[p_buffer->i_data] &= ~p_buffer->i_mask;
|
|
}
|
|
p_buffer->i_mask >>= 1;
|
|
if( p_buffer->i_mask == 0 )
|
|
{
|
|
p_buffer->i_data++;
|
|
p_buffer->i_mask = 0x80;
|
|
}
|
|
}
|
|
}
|
|
|
|
G_END_DECLS
|
|
|
|
#endif
|