/*****************************************************************************
- * bits.h :
+ * vlc_bits.h : Bit handling helpers
*****************************************************************************
- * Copyright (C) 2003 VideoLAN (Centrale Réseaux) and its contributors
+ * 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., 59 Temple Place - Suite 330, Boston, MA 02111, 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_common.h>
+#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 bool bo_init(bo_t *p_bo, int i_size)
+{
+ p_bo->b = block_Alloc(i_size);
+ if (!p_bo->b)
+ return false;
+
+ p_bo->b->i_buffer = 0;
+ p_bo->basesize = i_size;
+
+ return true;
+}
+
+static inline void bo_free(bo_t *p_bo)
+{
+ if(!p_bo)
+ return;
+ if(p_bo->b)
+ block_Release(p_bo->b);
+ free(p_bo);
+}
+
+static inline int bo_extend(bo_t *p_bo, size_t i_total)
+{
+ if(!p_bo->b)
+ return false;
+ const size_t i_size = p_bo->b->i_size - (p_bo->b->p_buffer - p_bo->b->p_start);
+ if (i_total >= i_size)
+ {
+ int i_growth = p_bo->basesize;
+ while(i_total >= 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 false;
+ p_bo->b->i_buffer = i;
+ }
+ return true;
+}
+
+#define BO_SET_DECL_S(func, handler, type) static inline bool func(bo_t *p_bo, size_t i_offset, type val)\
+ {\
+ if (!bo_extend(p_bo, i_offset + sizeof(type)))\
+ return false;\
+ handler(&p_bo->b->p_buffer[i_offset], val);\
+ return true;\
+ }
+
+#define BO_ADD_DECL_S(func, handler, type) static inline bool func(bo_t *p_bo, type val)\
+ {\
+ if(!p_bo->b || !handler(p_bo, p_bo->b->i_buffer, val))\
+ return false;\
+ p_bo->b->i_buffer += sizeof(type);\
+ return true;\
+ }
+
+#define BO_FUNC_DECL(suffix, handler, type ) \
+ BO_SET_DECL_S( bo_set_ ## suffix ## be, handler ## BE, type )\
+ BO_SET_DECL_S( bo_set_ ## suffix ## le, handler ## LE, type )\
+ BO_ADD_DECL_S( bo_add_ ## suffix ## be, bo_set_ ## suffix ## be, type )\
+ BO_ADD_DECL_S( bo_add_ ## suffix ## le, bo_set_ ## suffix ## le, type )
+
+static inline bool bo_set_8(bo_t *p_bo, size_t i_offset, uint8_t i)
+{
+ if (!bo_extend(p_bo, i_offset + 1))
+ return false;
+ p_bo->b->p_buffer[i_offset] = i;
+ return true;
+}
+
+static inline bool bo_add_8(bo_t *p_bo, uint8_t i)
+{
+ if(!p_bo->b || !bo_set_8( p_bo, p_bo->b->i_buffer, i ))
+ return false;
+ p_bo->b->i_buffer++;
+ return true;
+}
+
+/* declares all bo_[set,add]_[16,32,64] */
+BO_FUNC_DECL( 16, SetW, uint16_t )
+BO_FUNC_DECL( 32, SetDW, uint32_t )
+BO_FUNC_DECL( 64, SetQW, uint64_t )
+
+#undef BO_FUNC_DECL
+#undef BO_SET_DECL_S
+#undef BO_ADD_DECL_S
+
+static inline bool bo_add_24be(bo_t *p_bo, uint32_t i)
+{
+ if(!p_bo->b || !bo_extend(p_bo, p_bo->b->i_buffer + 3))
+ return false;
+ p_bo->b->p_buffer[p_bo->b->i_buffer++] = ((i >> 16) & 0xff);
+ p_bo->b->p_buffer[p_bo->b->i_buffer++] = ((i >> 8) & 0xff);
+ p_bo->b->p_buffer[p_bo->b->i_buffer++] = (i & 0xff);
+ return true;
+}
+
+static inline void bo_swap_32be (bo_t *p_bo, size_t i_pos, uint32_t i)
+{
+ if (!p_bo->b || p_bo->b->i_buffer < i_pos + 4)
+ return;
+ 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 bool bo_add_mem(bo_t *p_bo, size_t i_size, const void *p_mem)
+{
+ if(!p_bo->b || !bo_extend(p_bo, p_bo->b->i_buffer + i_size))
+ return false;
+ memcpy(&p_bo->b->p_buffer[p_bo->b->i_buffer], p_mem, i_size);
+ p_bo->b->i_buffer += i_size;
+ return true;
+}
+
+#define bo_add_fourcc(p_bo, fcc) bo_add_mem(p_bo, 4, fcc)
+
#endif
projects / vlc / blobdiff