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Diffstat (limited to 'apps/codecs/libwma/bitstream.c')
-rw-r--r-- | apps/codecs/libwma/bitstream.c | 271 |
1 files changed, 0 insertions, 271 deletions
diff --git a/apps/codecs/libwma/bitstream.c b/apps/codecs/libwma/bitstream.c deleted file mode 100644 index 618148b721..0000000000 --- a/apps/codecs/libwma/bitstream.c +++ /dev/null | |||
@@ -1,271 +0,0 @@ | |||
1 | /* | ||
2 | * Common bit i/o utils | ||
3 | * Copyright (c) 2000, 2001 Fabrice Bellard. | ||
4 | * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at> | ||
5 | * | ||
6 | * This file is part of FFmpeg. | ||
7 | * | ||
8 | * FFmpeg is free software; you can redistribute it and/or | ||
9 | * modify it under the terms of the GNU Lesser General Public | ||
10 | * License as published by the Free Software Foundation; either | ||
11 | * version 2.1 of the License, or (at your option) any later version. | ||
12 | * | ||
13 | * FFmpeg is distributed in the hope that it will be useful, | ||
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
16 | * Lesser General Public License for more details. | ||
17 | * | ||
18 | * You should have received a copy of the GNU Lesser General Public | ||
19 | * License along with FFmpeg; if not, write to the Free Software | ||
20 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | ||
21 | * | ||
22 | * alternative bitstream reader & writer by Michael Niedermayer <michaelni@gmx.at> | ||
23 | */ | ||
24 | |||
25 | /** | ||
26 | * @file bitstream.c | ||
27 | * bitstream api. | ||
28 | */ | ||
29 | |||
30 | #include "bitstream.h" | ||
31 | #include <codecs/lib/codeclib.h> | ||
32 | |||
33 | /** | ||
34 | * Same as av_mallocz_static(), but does a realloc. | ||
35 | * | ||
36 | * @param[in] ptr The block of memory to reallocate. | ||
37 | * @param[in] size The requested size. | ||
38 | * @return Block of memory of requested size. | ||
39 | * @deprecated. Code which uses ff_realloc_static is broken/missdesigned | ||
40 | * and should correctly use static arrays | ||
41 | */ | ||
42 | attribute_deprecated void *ff_realloc_static(void *ptr, unsigned int size); | ||
43 | |||
44 | |||
45 | const uint8_t ff_sqrt_tab[128]={ | ||
46 | 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, | ||
47 | 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, | ||
48 | 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, | ||
49 | 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 | ||
50 | }; | ||
51 | |||
52 | const uint8_t ff_log2_tab[256]={ | ||
53 | 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, | ||
54 | 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, | ||
55 | 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, | ||
56 | 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, | ||
57 | 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, | ||
58 | 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, | ||
59 | 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, | ||
60 | 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 | ||
61 | }; | ||
62 | |||
63 | |||
64 | void align_put_bits(PutBitContext *s) | ||
65 | { | ||
66 | #ifdef ALT_BITSTREAM_WRITER | ||
67 | put_bits(s,( - s->index) & 7,0); | ||
68 | #else | ||
69 | put_bits(s,s->bit_left & 7,0); | ||
70 | #endif | ||
71 | } | ||
72 | |||
73 | void ff_put_string(PutBitContext * pbc, char *s, int put_zero) | ||
74 | { | ||
75 | while(*s){ | ||
76 | put_bits(pbc, 8, *s); | ||
77 | s++; | ||
78 | } | ||
79 | if(put_zero) | ||
80 | put_bits(pbc, 8, 0); | ||
81 | } | ||
82 | |||
83 | /* VLC decoding */ | ||
84 | |||
85 | //#define DEBUG_VLC | ||
86 | |||
87 | #define GET_DATA(v, table, i, wrap, size) \ | ||
88 | {\ | ||
89 | const uint8_t *ptr = (const uint8_t *)table + i * wrap;\ | ||
90 | switch(size) {\ | ||
91 | case 1:\ | ||
92 | v = *(const uint8_t *)ptr;\ | ||
93 | break;\ | ||
94 | case 2:\ | ||
95 | v = *(const uint16_t *)ptr;\ | ||
96 | break;\ | ||
97 | default:\ | ||
98 | v = *(const uint32_t *)ptr;\ | ||
99 | break;\ | ||
100 | }\ | ||
101 | } | ||
102 | |||
103 | |||
104 | static int alloc_table(VLC *vlc, int size) | ||
105 | { | ||
106 | int index; | ||
107 | index = vlc->table_size; | ||
108 | vlc->table_size += size; | ||
109 | if (vlc->table_size > vlc->table_allocated) { | ||
110 | DEBUGF("Tried to allocate past the end of a Huffman table: %d/%d\n", | ||
111 | vlc->table_allocated, vlc->table_allocated+(1 << vlc->bits)); | ||
112 | vlc->table_allocated += (1 << vlc->bits); | ||
113 | if (!vlc->table) | ||
114 | return -1; | ||
115 | } | ||
116 | return index; | ||
117 | } | ||
118 | |||
119 | static int build_table(VLC *vlc, int table_nb_bits, | ||
120 | int nb_codes, | ||
121 | const void *bits, int bits_wrap, int bits_size, | ||
122 | const void *codes, int codes_wrap, int codes_size, | ||
123 | uint32_t code_prefix, int n_prefix) | ||
124 | { | ||
125 | int i, j, k, n, table_size, table_index, nb, n1, index, code_prefix2; | ||
126 | uint32_t code; | ||
127 | int flags = 0; | ||
128 | VLC_TYPE (*table)[2]; | ||
129 | |||
130 | table_size = 1 << table_nb_bits; | ||
131 | table_index = alloc_table(vlc, table_size); | ||
132 | #ifdef DEBUG_VLC | ||
133 | printf("new table index=%d size=%d code_prefix=%x n=%d\n", | ||
134 | table_index, table_size, code_prefix, n_prefix); | ||
135 | #endif | ||
136 | if (table_index < 0) | ||
137 | return -1; | ||
138 | table = &vlc->table[table_index]; | ||
139 | |||
140 | for(i=0;i<table_size;i++) { | ||
141 | table[i][1] = 0; //bits | ||
142 | table[i][0] = -1; //codes | ||
143 | } | ||
144 | |||
145 | /* first pass: map codes and compute auxillary table sizes */ | ||
146 | for(i=0;i<nb_codes;i++) { | ||
147 | GET_DATA(n, bits, i, bits_wrap, bits_size); | ||
148 | GET_DATA(code, codes, i, codes_wrap, codes_size); | ||
149 | /* we accept tables with holes */ | ||
150 | if (n <= 0) | ||
151 | continue; | ||
152 | #if defined(DEBUG_VLC) && 0 | ||
153 | printf("i=%d n=%d code=0x%x\n", i, n, code); | ||
154 | #endif | ||
155 | /* if code matches the prefix, it is in the table */ | ||
156 | n -= n_prefix; | ||
157 | if(flags & INIT_VLC_LE) | ||
158 | code_prefix2= code & (n_prefix>=32 ? 0xffffffff : (uint32_t)(1 << n_prefix)-1); | ||
159 | else | ||
160 | code_prefix2= code >> n; | ||
161 | if (n > 0 && (int)code_prefix2 == (int)code_prefix) { | ||
162 | if (n <= table_nb_bits) { | ||
163 | /* no need to add another table */ | ||
164 | j = (code << (table_nb_bits - n)) & (table_size - 1); | ||
165 | nb = 1 << (table_nb_bits - n); | ||
166 | for(k=0;k<nb;k++) { | ||
167 | if(flags & INIT_VLC_LE) | ||
168 | j = (code >> n_prefix) + (k<<n); | ||
169 | #ifdef DEBUG_VLC | ||
170 | av_log(NULL, 0, "%4x: code=%d n=%d\n", | ||
171 | j, i, n); | ||
172 | #endif | ||
173 | if (table[j][1] /*bits*/ != 0) { | ||
174 | return -1; | ||
175 | } | ||
176 | table[j][1] = n; //bits | ||
177 | table[j][0] = i; //code | ||
178 | j++; | ||
179 | } | ||
180 | } else { | ||
181 | n -= table_nb_bits; | ||
182 | j = (code >> ((flags & INIT_VLC_LE) ? n_prefix : n)) & ((1 << table_nb_bits) - 1); | ||
183 | #ifdef DEBUG_VLC | ||
184 | av_log(NULL, 0,"%4x: n=%d (subtable)\n", | ||
185 | j, n); | ||
186 | #endif | ||
187 | /* compute table size */ | ||
188 | n1 = -table[j][1]; //bits | ||
189 | if (n > n1) | ||
190 | n1 = n; | ||
191 | table[j][1] = -n1; //bits | ||
192 | } | ||
193 | } | ||
194 | } | ||
195 | |||
196 | /* second pass : fill auxillary tables recursively */ | ||
197 | for(i=0;i<table_size;i++) { | ||
198 | n = table[i][1]; //bits | ||
199 | if (n < 0) { | ||
200 | n = -n; | ||
201 | if (n > table_nb_bits) { | ||
202 | n = table_nb_bits; | ||
203 | table[i][1] = -n; //bits | ||
204 | } | ||
205 | index = build_table(vlc, n, nb_codes, | ||
206 | bits, bits_wrap, bits_size, | ||
207 | codes, codes_wrap, codes_size, | ||
208 | (flags & INIT_VLC_LE) ? (code_prefix | (i << n_prefix)) : ((code_prefix << table_nb_bits) | i), | ||
209 | n_prefix + table_nb_bits); | ||
210 | if (index < 0) | ||
211 | return -1; | ||
212 | /* note: realloc has been done, so reload tables */ | ||
213 | table = &vlc->table[table_index]; | ||
214 | table[i][0] = index; //code | ||
215 | } | ||
216 | } | ||
217 | return table_index; | ||
218 | } | ||
219 | |||
220 | |||
221 | /* Build VLC decoding tables suitable for use with get_vlc(). | ||
222 | |||
223 | 'nb_bits' set thee decoding table size (2^nb_bits) entries. The | ||
224 | bigger it is, the faster is the decoding. But it should not be too | ||
225 | big to save memory and L1 cache. '9' is a good compromise. | ||
226 | |||
227 | 'nb_codes' : number of vlcs codes | ||
228 | |||
229 | 'bits' : table which gives the size (in bits) of each vlc code. | ||
230 | |||
231 | 'codes' : table which gives the bit pattern of of each vlc code. | ||
232 | |||
233 | 'xxx_wrap' : give the number of bytes between each entry of the | ||
234 | 'bits' or 'codes' tables. | ||
235 | |||
236 | 'xxx_size' : gives the number of bytes of each entry of the 'bits' | ||
237 | or 'codes' tables. | ||
238 | |||
239 | 'wrap' and 'size' allows to use any memory configuration and types | ||
240 | (byte/word/long) to store the 'bits' and 'codes' tables. | ||
241 | |||
242 | 'use_static' should be set to 1 for tables, which should be freed | ||
243 | with av_free_static(), 0 if free_vlc() will be used. | ||
244 | */ | ||
245 | int init_vlc(VLC *vlc, int nb_bits, int nb_codes, | ||
246 | const void *bits, int bits_wrap, int bits_size, | ||
247 | const void *codes, int codes_wrap, int codes_size, | ||
248 | int flags) | ||
249 | { | ||
250 | |||
251 | vlc->bits = nb_bits; | ||
252 | vlc->table_size = 0; | ||
253 | |||
254 | #ifdef DEBUG_VLC | ||
255 | printf("build table nb_codes=%d\n", nb_codes); | ||
256 | #endif | ||
257 | |||
258 | if (build_table(vlc, nb_bits, nb_codes, | ||
259 | bits, bits_wrap, bits_size, | ||
260 | codes, codes_wrap, codes_size, | ||
261 | 0, 0) < 0) { | ||
262 | //av_free(vlc->table); | ||
263 | return -1; | ||
264 | } | ||
265 | /* return flags to block gcc warning while allowing us to keep | ||
266 | * consistent with ffmpeg's function parameters | ||
267 | */ | ||
268 | return flags; | ||
269 | } | ||
270 | |||
271 | |||