/*****************************************************************************
- * bits.h : Bit handling helpers
+ * vlc_bits.h : Bit handling helpers
*****************************************************************************
- * Copyright (C) 2003 the VideoLAN team
+ * Copyright (C) 2001, 2002, 2003, 2006, 2015 VLC authors and VideoLAN
* $Id$
*
* Authors: Laurent Aimar <fenrir@via.ecp.fr>
+ * Gildas Bazin <gbazin at videolan dot org>
+ * Rafaël Carré <funman at videolan dot org>
*
- * 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
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation; either version 2.1 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.
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Lesser 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.
+ * You should have received a copy of the GNU Lesser 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 _VLC_BITS_H
-#define _VLC_BITS_H 1
+#ifndef VLC_BITS_H
+#define VLC_BITS_H 1
+
+#include <vlc_block.h>
+
+/**
+ * \file
+ * This file defines functions, structures for handling streams of bits in vlc
+ */
+
+typedef struct bo_t
+{
+ block_t *b;
+ size_t basesize;
+} bo_t;
typedef struct bs_s
{
uint8_t *p;
uint8_t *p_end;
- int i_left; /* i_count number of available bits */
+ ssize_t i_left; /* i_count number of available bits */
} bs_t;
-static inline void bs_init( bs_t *s, void *p_data, int i_data )
+static inline void bs_init( bs_t *s, const void *p_data, size_t i_data )
{
- s->p_start = p_data;
- s->p = p_data;
- s->p_end = s->p + i_data;
+ s->p_start = (void *)p_data;
+ s->p = s->p_start;
+ s->p_end = s->p_start + i_data;
s->i_left = 8;
}
-static inline int bs_pos( bs_t *s )
+
+static inline int bs_pos( const bs_t *s )
{
return( 8 * ( s->p - s->p_start ) + 8 - s->i_left );
}
-static inline int bs_eof( bs_t *s )
+
+static inline int bs_eof( const bs_t *s )
{
return( s->p >= s->p_end ? 1: 0 );
}
+
static inline uint32_t bs_read( bs_t *s, int i_count )
{
- static uint32_t i_mask[33] =
+ static const uint32_t i_mask[33] =
{ 0x00,
0x01, 0x03, 0x07, 0x0f,
0x1f, 0x3f, 0x7f, 0xff,
return bs_read( &s_tmp, i_count );
}
-static inline void bs_skip( bs_t *s, int i_count )
+static inline void bs_skip( bs_t *s, ssize_t i_count )
{
s->i_left -= i_count;
- while( s->i_left <= 0 )
+ if( s->i_left <= 0 )
{
- s->p++;
- s->i_left += 8;
+ const int i_bytes = ( -s->i_left + 8 ) / 8;
+
+ s->p += i_bytes;
+ s->i_left += 8 * i_bytes;
}
}
s->p++;
}
}
+
static inline void bs_align_0( bs_t *s )
{
if( s->i_left != 8 )
bs_write( s, s->i_left, 0 );
}
}
+
static inline void bs_align_1( bs_t *s )
{
while( s->i_left != 8 )
}
}
+static inline int bo_init(bo_t *p_bo, int i_size)
+{
+ p_bo->b = block_Alloc(i_size);
+ if (!p_bo->b)
+ return VLC_ENOMEM;
+
+ p_bo->b->i_buffer = 0;
+ p_bo->basesize = i_size;
+
+ return VLC_SUCCESS;
+}
+
+static inline void bo_set_8(bo_t *p_bo, size_t i_offset, uint8_t i)
+{
+ size_t i_size = p_bo->b->i_size - (p_bo->b->p_buffer - p_bo->b->p_start);
+ if (i_offset >= i_size)
+ {
+ int i_growth = p_bo->basesize;
+ while(i_offset >= i_size + i_growth)
+ i_growth += p_bo->basesize;
+
+ int i = p_bo->b->i_buffer; /* Realloc would set payload size == buffer size */
+ p_bo->b = block_Realloc(p_bo->b, 0, i_size + i_growth);
+ if (!p_bo->b)
+ return;
+ p_bo->b->i_buffer = i;
+ }
+ p_bo->b->p_buffer[i_offset] = i;
+}
+
+static inline void bo_add_8(bo_t *p_bo, uint8_t i)
+{
+ bo_set_8( p_bo, p_bo->b->i_buffer, i );
+ p_bo->b->i_buffer++;
+}
+
+static inline void bo_add_16be(bo_t *p_bo, uint16_t i)
+{
+ bo_add_8(p_bo, ((i >> 8) &0xff));
+ bo_add_8(p_bo, i &0xff);
+}
+
+static inline void bo_add_16le(bo_t *p_bo, uint16_t i)
+{
+ bo_add_8(p_bo, i &0xff);
+ bo_add_8(p_bo, ((i >> 8) &0xff));
+}
+
+static inline void bo_set_16be(bo_t *p_bo, int i_offset, uint16_t i)
+{
+ bo_set_8(p_bo, i_offset, ((i >> 8) &0xff));
+ bo_set_8(p_bo, i_offset + 1, i &0xff);
+}
+
+static inline void bo_set_16le(bo_t *p_bo, int i_offset, uint16_t i)
+{
+ bo_set_8(p_bo, i_offset, i &0xff);
+ bo_set_8(p_bo, i_offset + 1, ((i >> 8) &0xff));
+}
+
+static inline void bo_add_24be(bo_t *p_bo, uint32_t i)
+{
+ bo_add_8(p_bo, ((i >> 16) &0xff));
+ bo_add_8(p_bo, ((i >> 8) &0xff));
+ bo_add_8(p_bo, (i &0xff));
+}
+
+static inline void bo_add_32be(bo_t *p_bo, uint32_t i)
+{
+ bo_add_16be(p_bo, ((i >> 16) &0xffff));
+ bo_add_16be(p_bo, i &0xffff);
+}
+
+static inline void bo_add_32le(bo_t *p_bo, uint32_t i)
+{
+ bo_add_16le(p_bo, i &0xffff);
+ bo_add_16le(p_bo, ((i >> 16) &0xffff));
+}
+
+static inline void bo_set_32be(bo_t *p_bo, int i_offset, uint32_t i)
+{
+ bo_set_16be(p_bo, i_offset, ((i >> 16) &0xffff));
+ bo_set_16be(p_bo, i_offset + 2, i &0xffff);
+}
+
+static inline void bo_set_32le(bo_t *p_bo, int i_offset, uint32_t i)
+{
+ bo_set_16le(p_bo, i_offset, i &0xffff);
+ bo_set_16le(p_bo, i_offset + 2, ((i >> 16) &0xffff));
+}
+
+static inline void bo_swap_32be (bo_t *p_bo, int i_pos, uint32_t i)
+{
+ p_bo->b->p_buffer[i_pos ] = (i >> 24)&0xff;
+ p_bo->b->p_buffer[i_pos + 1] = (i >> 16)&0xff;
+ p_bo->b->p_buffer[i_pos + 2] = (i >> 8)&0xff;
+ p_bo->b->p_buffer[i_pos + 3] = (i )&0xff;
+}
+
+static inline void bo_set_64be(bo_t *p_bo, int i_offset, uint64_t i)
+{
+ bo_set_32be(p_bo, i_offset, ((i >> 32) &0xffffffff));
+ bo_set_32be(p_bo, i_offset + 4, i &0xffffffff);
+}
+
+static inline void bo_add_64be(bo_t *p_bo, uint64_t i)
+{
+ bo_add_32be(p_bo, ((i >> 32) &0xffffffff));
+ bo_add_32be(p_bo, i &0xffffffff);
+}
+
+static inline void bo_add_64le(bo_t *p_bo, uint64_t i)
+{
+ bo_add_32le(p_bo, i &0xffffffff);
+ bo_add_32le(p_bo, ((i >> 32) &0xffffffff));
+}
+
+static inline void bo_add_fourcc(bo_t *p_bo, const char *fcc)
+{
+ bo_add_8(p_bo, fcc[0]);
+ bo_add_8(p_bo, fcc[1]);
+ bo_add_8(p_bo, fcc[2]);
+ bo_add_8(p_bo, fcc[3]);
+}
+
+static inline void bo_add_mem(bo_t *p_bo, int i_size, const uint8_t *p_mem)
+{
+ for (int i = 0; i < i_size; i++)
+ bo_add_8(p_bo, p_mem[i]);
+}
+
#endif
projects / vlc / blobdiff