* Copyright (c) 2000, 2001 Fabrice Bellard.
* Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
*
+ * alternative bitstream reader & writer by Michael Niedermayer <michaelni@gmx.at>
+ *
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- *
- * alternative bitstream reader & writer by Michael Niedermayer <michaelni@gmx.at>
*/
/**
* @param[in] ptr The block of memory to reallocate.
* @param[in] size The requested size.
* @return Block of memory of requested size.
- * @deprecated. Code which uses ff_realloc_static is broken/missdesigned
+ * @deprecated. Code which uses ff_realloc_static is broken/misdesigned
* and should correctly use static arrays
*/
attribute_deprecated void *ff_realloc_static(void *ptr, unsigned int size);
put_bits(pbc, 8, 0);
}
+void ff_copy_bits(PutBitContext *pb, uint8_t *src, int length)
+{
+ const uint16_t *srcw= (uint16_t*)src;
+ int words= length>>4;
+ int bits= length&15;
+ int i;
+
+ if(length==0) return;
+
+ if(ENABLE_SMALL || words < 16 || put_bits_count(pb)&7){
+ for(i=0; i<words; i++) put_bits(pb, 16, be2me_16(srcw[i]));
+ }else{
+ for(i=0; put_bits_count(pb)&31; i++)
+ put_bits(pb, 8, src[i]);
+ flush_put_bits(pb);
+ memcpy(pbBufPtr(pb), src+i, 2*words-i);
+ skip_put_bytes(pb, 2*words-i);
+ }
+
+ put_bits(pb, bits, be2me_16(srcw[words])>>(16-bits));
+}
+
/* VLC decoding */
//#define DEBUG_VLC
int nb_codes,
const void *bits, int bits_wrap, int bits_size,
const void *codes, int codes_wrap, int codes_size,
+ const void *symbols, int symbols_wrap, int symbols_size,
uint32_t code_prefix, int n_prefix, int flags)
{
- int i, j, k, n, table_size, table_index, nb, n1, index, code_prefix2;
+ int i, j, k, n, table_size, table_index, nb, n1, index, code_prefix2, symbol;
uint32_t code;
VLC_TYPE (*table)[2];
/* we accept tables with holes */
if (n <= 0)
continue;
+ if (!symbols)
+ symbol = i;
+ else
+ GET_DATA(symbol, symbols, i, symbols_wrap, symbols_size);
#if defined(DEBUG_VLC) && 0
av_log(NULL,AV_LOG_DEBUG,"i=%d n=%d code=0x%x\n", i, n, code);
#endif
return -1;
}
table[j][1] = n; //bits
- table[j][0] = i; //code
+ table[j][0] = symbol;
j++;
}
} else {
index = build_table(vlc, n, nb_codes,
bits, bits_wrap, bits_size,
codes, codes_wrap, codes_size,
+ symbols, symbols_wrap, symbols_size,
(flags & INIT_VLC_LE) ? (code_prefix | (i << n_prefix)) : ((code_prefix << table_nb_bits) | i),
n_prefix + table_nb_bits, flags);
if (index < 0)
'codes' : table which gives the bit pattern of of each vlc code.
+ 'symbols' : table which gives the values to be returned from get_vlc().
+
'xxx_wrap' : give the number of bytes between each entry of the
'bits' or 'codes' tables.
or 'codes' tables.
'wrap' and 'size' allows to use any memory configuration and types
- (byte/word/long) to store the 'bits' and 'codes' tables.
+ (byte/word/long) to store the 'bits', 'codes', and 'symbols' tables.
'use_static' should be set to 1 for tables, which should be freed
with av_free_static(), 0 if free_vlc() will be used.
*/
-int init_vlc(VLC *vlc, int nb_bits, int nb_codes,
+int init_vlc_sparse(VLC *vlc, int nb_bits, int nb_codes,
const void *bits, int bits_wrap, int bits_size,
const void *codes, int codes_wrap, int codes_size,
+ const void *symbols, int symbols_wrap, int symbols_size,
int flags)
{
vlc->bits = nb_bits;
if (build_table(vlc, nb_bits, nb_codes,
bits, bits_wrap, bits_size,
codes, codes_wrap, codes_size,
+ symbols, symbols_wrap, symbols_size,
0, 0, flags) < 0) {
- av_free(vlc->table);
+ av_freep(&vlc->table);
return -1;
}
return 0;
void free_vlc(VLC *vlc)
{
- av_free(vlc->table);
+ av_freep(&vlc->table);
}