From 0f2b0eb0dc58d8275c2bf53942a7def1ac4eaafe Mon Sep 17 00:00:00 2001 From: Mike Melanson Date: Tue, 19 Apr 2005 05:29:58 +0000 Subject: no longer used in FFmpeg CVS patchset: 7466 CVS date: 2005/04/19 05:29:58 --- src/libffmpeg/libavcodec/common.c | 292 -------------------------------------- 1 file changed, 292 deletions(-) delete mode 100644 src/libffmpeg/libavcodec/common.c (limited to 'src/libffmpeg/libavcodec/common.c') diff --git a/src/libffmpeg/libavcodec/common.c b/src/libffmpeg/libavcodec/common.c deleted file mode 100644 index 72172fa4f..000000000 --- a/src/libffmpeg/libavcodec/common.c +++ /dev/null @@ -1,292 +0,0 @@ -/* - * Common bit i/o utils - * Copyright (c) 2000, 2001 Fabrice Bellard. - * Copyright (c) 2002-2004 Michael Niedermayer - * - * This library 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 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 - * Lesser General Public License for more details. - * - * You should have received a copy of the GNU Lesser 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 - * - * alternative bitstream reader & writer by Michael Niedermayer - */ - -/** - * @file common.c - * common internal api. - */ - -#include "avcodec.h" - -const uint8_t ff_sqrt_tab[128]={ - 0, 1, 1, 1, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 4, 4, 4, 5, 5, 5, 5, 5, 5, 5, - 5, 5, 5, 5, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, - 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, - 9, 9, 9, 9,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,11,11,11,11,11,11,11 -}; - -const uint8_t ff_log2_tab[256]={ - 0,0,1,1,2,2,2,2,3,3,3,3,3,3,3,3,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4, - 5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5, - 6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6, - 6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6, - 7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7, - 7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7, - 7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7, - 7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7 -}; - -void align_put_bits(PutBitContext *s) -{ -#ifdef ALT_BITSTREAM_WRITER - put_bits(s,( - s->index) & 7,0); -#else - put_bits(s,s->bit_left & 7,0); -#endif -} - -void put_string(PutBitContext * pbc, char *s, int put_zero) -{ - while(*s){ - put_bits(pbc, 8, *s); - s++; - } - if(put_zero) - put_bits(pbc, 8, 0); -} - -/* bit input functions */ - -/** - * reads 0-32 bits. - */ -unsigned int get_bits_long(GetBitContext *s, int n){ - if(n<=17) return get_bits(s, n); - else{ - int ret= get_bits(s, 16) << (n-16); - return ret | get_bits(s, n-16); - } -} - -/** - * shows 0-32 bits. - */ -unsigned int show_bits_long(GetBitContext *s, int n){ - if(n<=17) return show_bits(s, n); - else{ - GetBitContext gb= *s; - int ret= get_bits_long(s, n); - *s= gb; - return ret; - } -} - -void align_get_bits(GetBitContext *s) -{ - int n= (-get_bits_count(s)) & 7; - if(n) skip_bits(s, n); -} - -int check_marker(GetBitContext *s, const char *msg) -{ - int bit= get_bits1(s); - if(!bit) - av_log(NULL, AV_LOG_INFO, "Marker bit missing %s\n", msg); - - return bit; -} - -/* VLC decoding */ - -//#define DEBUG_VLC - -#define GET_DATA(v, table, i, wrap, size) \ -{\ - const uint8_t *ptr = (const uint8_t *)table + i * wrap;\ - switch(size) {\ - case 1:\ - v = *(const uint8_t *)ptr;\ - break;\ - case 2:\ - v = *(const uint16_t *)ptr;\ - break;\ - default:\ - v = *(const uint32_t *)ptr;\ - break;\ - }\ -} - - -static int alloc_table(VLC *vlc, int size) -{ - int index; - index = vlc->table_size; - vlc->table_size += size; - if (vlc->table_size > vlc->table_allocated) { - vlc->table_allocated += (1 << vlc->bits); - vlc->table = av_realloc(vlc->table, - sizeof(VLC_TYPE) * 2 * vlc->table_allocated); - if (!vlc->table) - return -1; - } - return index; -} - -static int build_table(VLC *vlc, int table_nb_bits, - int nb_codes, - const void *bits, int bits_wrap, int bits_size, - const void *codes, int codes_wrap, int codes_size, - uint32_t code_prefix, int n_prefix) -{ - int i, j, k, n, table_size, table_index, nb, n1, index; - uint32_t code; - VLC_TYPE (*table)[2]; - - table_size = 1 << table_nb_bits; - table_index = alloc_table(vlc, table_size); -#ifdef DEBUG_VLC - printf("new table index=%d size=%d code_prefix=%x n=%d\n", - table_index, table_size, code_prefix, n_prefix); -#endif - if (table_index < 0) - return -1; - table = &vlc->table[table_index]; - - for(i=0;i 0 && (code >> n) == code_prefix) { - if (n <= table_nb_bits) { - /* no need to add another table */ - j = (code << (table_nb_bits - n)) & (table_size - 1); - nb = 1 << (table_nb_bits - n); - for(k=0;k> n) & ((1 << table_nb_bits) - 1); -#ifdef DEBUG_VLC - printf("%4x: n=%d (subtable)\n", - j, n); -#endif - /* compute table size */ - n1 = -table[j][1]; //bits - if (n > n1) - n1 = n; - table[j][1] = -n1; //bits - } - } - } - - /* second pass : fill auxillary tables recursively */ - for(i=0;i table_nb_bits) { - n = table_nb_bits; - table[i][1] = -n; //bits - } - index = build_table(vlc, n, nb_codes, - bits, bits_wrap, bits_size, - codes, codes_wrap, codes_size, - (code_prefix << table_nb_bits) | i, - n_prefix + table_nb_bits); - if (index < 0) - return -1; - /* note: realloc has been done, so reload tables */ - table = &vlc->table[table_index]; - table[i][0] = index; //code - } - } - return table_index; -} - - -/* Build VLC decoding tables suitable for use with get_vlc(). - - 'nb_bits' set thee decoding table size (2^nb_bits) entries. The - bigger it is, the faster is the decoding. But it should not be too - big to save memory and L1 cache. '9' is a good compromise. - - 'nb_codes' : number of vlcs codes - - 'bits' : table which gives the size (in bits) of each vlc code. - - 'codes' : table which gives the bit pattern of of each vlc code. - - 'xxx_wrap' : give the number of bytes between each entry of the - 'bits' or 'codes' tables. - - 'xxx_size' : gives the number of bytes of each entry of the 'bits' - or 'codes' tables. - - 'wrap' and 'size' allows to use any memory configuration and types - (byte/word/long) to store the 'bits' and 'codes' tables. -*/ -int init_vlc(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) -{ - vlc->bits = nb_bits; - vlc->table = NULL; - vlc->table_allocated = 0; - vlc->table_size = 0; -#ifdef DEBUG_VLC - printf("build table nb_codes=%d\n", nb_codes); -#endif - - if (build_table(vlc, nb_bits, nb_codes, - bits, bits_wrap, bits_size, - codes, codes_wrap, codes_size, - 0, 0) < 0) { - av_free(vlc->table); - return -1; - } - return 0; -} - - -void free_vlc(VLC *vlc) -{ - av_free(vlc->table); -} - -int64_t ff_gcd(int64_t a, int64_t b){ - if(b) return ff_gcd(b, a%b); - else return a; -} -- cgit v1.2.3