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Diffstat (limited to 'apps/codecs/libwmapro/bitstream.c')
-rw-r--r-- | apps/codecs/libwmapro/bitstream.c | 338 |
1 files changed, 0 insertions, 338 deletions
diff --git a/apps/codecs/libwmapro/bitstream.c b/apps/codecs/libwmapro/bitstream.c deleted file mode 100644 index a149ff0289..0000000000 --- a/apps/codecs/libwmapro/bitstream.c +++ /dev/null | |||
@@ -1,338 +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 | * Copyright (c) 2010 Loren Merritt | ||
6 | * | ||
7 | * alternative bitstream reader & writer by Michael Niedermayer <michaelni@gmx.at> | ||
8 | * | ||
9 | * This file is part of FFmpeg. | ||
10 | * | ||
11 | * FFmpeg is free software; you can redistribute it and/or | ||
12 | * modify it under the terms of the GNU Lesser General Public | ||
13 | * License as published by the Free Software Foundation; either | ||
14 | * version 2.1 of the License, or (at your option) any later version. | ||
15 | * | ||
16 | * FFmpeg is distributed in the hope that it will be useful, | ||
17 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
19 | * Lesser General Public License for more details. | ||
20 | * | ||
21 | * You should have received a copy of the GNU Lesser General Public | ||
22 | * License along with FFmpeg; if not, write to the Free Software | ||
23 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | ||
24 | */ | ||
25 | |||
26 | /** | ||
27 | * @file libavcodec/bitstream.c | ||
28 | * bitstream api. | ||
29 | */ | ||
30 | |||
31 | #include "avcodec.h" | ||
32 | #include "get_bits.h" | ||
33 | #include "put_bits.h" | ||
34 | |||
35 | #define CONFIG_SMALL 0 // added to make it compile | ||
36 | |||
37 | const uint8_t ff_log2_run[32]={ | ||
38 | 0, 0, 0, 0, 1, 1, 1, 1, | ||
39 | 2, 2, 2, 2, 3, 3, 3, 3, | ||
40 | 4, 4, 5, 5, 6, 6, 7, 7, | ||
41 | 8, 9,10,11,12,13,14,15 | ||
42 | }; | ||
43 | |||
44 | void align_put_bits(PutBitContext *s) | ||
45 | { | ||
46 | #ifdef ALT_BITSTREAM_WRITER | ||
47 | put_bits(s,( - s->index) & 7,0); | ||
48 | #else | ||
49 | put_bits(s,s->bit_left & 7,0); | ||
50 | #endif | ||
51 | } | ||
52 | |||
53 | void ff_put_string(PutBitContext *pb, const char *string, int terminate_string) | ||
54 | { | ||
55 | while(*string){ | ||
56 | put_bits(pb, 8, *string); | ||
57 | string++; | ||
58 | } | ||
59 | if(terminate_string) | ||
60 | put_bits(pb, 8, 0); | ||
61 | } | ||
62 | |||
63 | void ff_copy_bits(PutBitContext *pb, const uint8_t *src, int length) | ||
64 | { | ||
65 | int words= length>>4; | ||
66 | int bits= length&15; | ||
67 | int i; | ||
68 | |||
69 | if(length==0) return; | ||
70 | |||
71 | if(CONFIG_SMALL || words < 16 || put_bits_count(pb)&7){ | ||
72 | for(i=0; i<words; i++) put_bits(pb, 16, AV_RB16(src + 2*i)); | ||
73 | }else{ | ||
74 | for(i=0; put_bits_count(pb)&31; i++) | ||
75 | put_bits(pb, 8, src[i]); | ||
76 | flush_put_bits(pb); | ||
77 | memcpy(put_bits_ptr(pb), src+i, 2*words-i); | ||
78 | skip_put_bytes(pb, 2*words-i); | ||
79 | } | ||
80 | |||
81 | put_bits(pb, bits, AV_RB16(src + 2*words)>>(16-bits)); | ||
82 | } | ||
83 | |||
84 | /* VLC decoding */ | ||
85 | |||
86 | //#define DEBUG_VLC | ||
87 | |||
88 | #define GET_DATA(v, table, i, wrap, size) \ | ||
89 | {\ | ||
90 | const uint8_t *ptr = (const uint8_t *)table + i * wrap;\ | ||
91 | switch(size) {\ | ||
92 | case 1:\ | ||
93 | v = *(const uint8_t *)ptr;\ | ||
94 | break;\ | ||
95 | case 2:\ | ||
96 | v = *(const uint16_t *)ptr;\ | ||
97 | break;\ | ||
98 | default:\ | ||
99 | v = *(const uint32_t *)ptr;\ | ||
100 | break;\ | ||
101 | }\ | ||
102 | } | ||
103 | |||
104 | |||
105 | static int alloc_table(VLC *vlc, int size, int use_static) | ||
106 | { | ||
107 | int index; | ||
108 | index = vlc->table_size; | ||
109 | vlc->table_size += size; | ||
110 | if (vlc->table_size > vlc->table_allocated) { | ||
111 | if(use_static) | ||
112 | abort(); //cant do anything, init_vlc() is used with too little memory | ||
113 | vlc->table_allocated += (1 << vlc->bits); | ||
114 | vlc->table = av_realloc(vlc->table, | ||
115 | sizeof(VLC_TYPE) * 2 * vlc->table_allocated); | ||
116 | if (!vlc->table) | ||
117 | return -1; | ||
118 | } | ||
119 | return index; | ||
120 | } | ||
121 | |||
122 | static av_always_inline uint32_t bitswap_32(uint32_t x) { | ||
123 | return av_reverse[x&0xFF]<<24 | ||
124 | | av_reverse[(x>>8)&0xFF]<<16 | ||
125 | | av_reverse[(x>>16)&0xFF]<<8 | ||
126 | | av_reverse[x>>24]; | ||
127 | } | ||
128 | |||
129 | typedef struct { | ||
130 | uint8_t bits; | ||
131 | uint16_t symbol; | ||
132 | /** codeword, with the first bit-to-be-read in the msb | ||
133 | * (even if intended for a little-endian bitstream reader) */ | ||
134 | uint32_t code; | ||
135 | } VLCcode; | ||
136 | |||
137 | static int compare_vlcspec(const void *a, const void *b) | ||
138 | { | ||
139 | const VLCcode *sa=a, *sb=b; | ||
140 | return (sa->code >> 1) - (sb->code >> 1); | ||
141 | } | ||
142 | |||
143 | /** | ||
144 | * Build VLC decoding tables suitable for use with get_vlc(). | ||
145 | * | ||
146 | * @param vlc the context to be initted | ||
147 | * | ||
148 | * @param table_nb_bits max length of vlc codes to store directly in this table | ||
149 | * (Longer codes are delegated to subtables.) | ||
150 | * | ||
151 | * @param nb_codes number of elements in codes[] | ||
152 | * | ||
153 | * @param codes descriptions of the vlc codes | ||
154 | * These must be ordered such that codes going into the same subtable are contiguous. | ||
155 | * Sorting by VLCcode.code is sufficient, though not necessary. | ||
156 | */ | ||
157 | static int build_table(VLC *vlc, int table_nb_bits, int nb_codes, | ||
158 | VLCcode *codes, int flags) | ||
159 | { | ||
160 | int table_size, table_index, index, code_prefix, symbol, subtable_bits; | ||
161 | int i, j, k, n, nb, inc; | ||
162 | uint32_t code; | ||
163 | VLC_TYPE (*table)[2]; | ||
164 | |||
165 | table_size = 1 << table_nb_bits; | ||
166 | table_index = alloc_table(vlc, table_size, flags & INIT_VLC_USE_NEW_STATIC); | ||
167 | #ifdef DEBUG_VLC | ||
168 | av_log(NULL,AV_LOG_DEBUG,"new table index=%d size=%d\n", | ||
169 | table_index, table_size); | ||
170 | #endif | ||
171 | if (table_index < 0) | ||
172 | return -1; | ||
173 | table = &vlc->table[table_index]; | ||
174 | |||
175 | for (i = 0; i < table_size; i++) { | ||
176 | table[i][1] = 0; //bits | ||
177 | table[i][0] = -1; //codes | ||
178 | } | ||
179 | |||
180 | /* first pass: map codes and compute auxillary table sizes */ | ||
181 | for (i = 0; i < nb_codes; i++) { | ||
182 | n = codes[i].bits; | ||
183 | code = codes[i].code; | ||
184 | symbol = codes[i].symbol; | ||
185 | #if defined(DEBUG_VLC) && 0 | ||
186 | av_log(NULL,AV_LOG_DEBUG,"i=%d n=%d code=0x%x\n", i, n, code); | ||
187 | #endif | ||
188 | if (n <= table_nb_bits) { | ||
189 | /* no need to add another table */ | ||
190 | j = code >> (32 - table_nb_bits); | ||
191 | nb = 1 << (table_nb_bits - n); | ||
192 | inc = 1; | ||
193 | if (flags & INIT_VLC_LE) { | ||
194 | j = bitswap_32(code); | ||
195 | inc = 1 << n; | ||
196 | } | ||
197 | for (k = 0; k < nb; k++) { | ||
198 | #ifdef DEBUG_VLC | ||
199 | av_log(NULL, AV_LOG_DEBUG, "%4x: code=%d n=%d\n", | ||
200 | j, i, n); | ||
201 | #endif | ||
202 | if (table[j][1] /*bits*/ != 0) { | ||
203 | av_log(NULL, AV_LOG_ERROR, "incorrect codes\n"); | ||
204 | return -1; | ||
205 | } | ||
206 | table[j][1] = n; //bits | ||
207 | table[j][0] = symbol; | ||
208 | j += inc; | ||
209 | } | ||
210 | } else { | ||
211 | /* fill auxiliary table recursively */ | ||
212 | n -= table_nb_bits; | ||
213 | code_prefix = code >> (32 - table_nb_bits); | ||
214 | subtable_bits = n; | ||
215 | codes[i].bits = n; | ||
216 | codes[i].code = code << table_nb_bits; | ||
217 | for (k = i+1; k < nb_codes; k++) { | ||
218 | n = codes[k].bits - table_nb_bits; | ||
219 | if (n <= 0) | ||
220 | break; | ||
221 | code = codes[k].code; | ||
222 | if (code >> (32 - table_nb_bits) != code_prefix) | ||
223 | break; | ||
224 | codes[k].bits = n; | ||
225 | codes[k].code = code << table_nb_bits; | ||
226 | subtable_bits = FFMAX(subtable_bits, n); | ||
227 | } | ||
228 | subtable_bits = FFMIN(subtable_bits, table_nb_bits); | ||
229 | j = (flags & INIT_VLC_LE) ? bitswap_32(code_prefix) >> (32 - table_nb_bits) : code_prefix; | ||
230 | table[j][1] = -subtable_bits; | ||
231 | #ifdef DEBUG_VLC | ||
232 | av_log(NULL,AV_LOG_DEBUG,"%4x: n=%d (subtable)\n", | ||
233 | j, codes[i].bits + table_nb_bits); | ||
234 | #endif | ||
235 | index = build_table(vlc, subtable_bits, k-i, codes+i, flags); | ||
236 | if (index < 0) | ||
237 | return -1; | ||
238 | /* note: realloc has been done, so reload tables */ | ||
239 | table = &vlc->table[table_index]; | ||
240 | table[j][0] = index; //code | ||
241 | i = k-1; | ||
242 | } | ||
243 | } | ||
244 | return table_index; | ||
245 | } | ||
246 | |||
247 | |||
248 | /* Build VLC decoding tables suitable for use with get_vlc(). | ||
249 | |||
250 | 'nb_bits' set thee decoding table size (2^nb_bits) entries. The | ||
251 | bigger it is, the faster is the decoding. But it should not be too | ||
252 | big to save memory and L1 cache. '9' is a good compromise. | ||
253 | |||
254 | 'nb_codes' : number of vlcs codes | ||
255 | |||
256 | 'bits' : table which gives the size (in bits) of each vlc code. | ||
257 | |||
258 | 'codes' : table which gives the bit pattern of of each vlc code. | ||
259 | |||
260 | 'symbols' : table which gives the values to be returned from get_vlc(). | ||
261 | |||
262 | 'xxx_wrap' : give the number of bytes between each entry of the | ||
263 | 'bits' or 'codes' tables. | ||
264 | |||
265 | 'xxx_size' : gives the number of bytes of each entry of the 'bits' | ||
266 | or 'codes' tables. | ||
267 | |||
268 | 'wrap' and 'size' allows to use any memory configuration and types | ||
269 | (byte/word/long) to store the 'bits', 'codes', and 'symbols' tables. | ||
270 | |||
271 | 'use_static' should be set to 1 for tables, which should be freed | ||
272 | with av_free_static(), 0 if free_vlc() will be used. | ||
273 | */ | ||
274 | int init_vlc_sparse(VLC *vlc, int nb_bits, int nb_codes, | ||
275 | const void *bits, int bits_wrap, int bits_size, | ||
276 | const void *codes, int codes_wrap, int codes_size, | ||
277 | const void *symbols, int symbols_wrap, int symbols_size, | ||
278 | int flags) | ||
279 | { | ||
280 | VLCcode buf[nb_codes]; | ||
281 | int i, j; | ||
282 | |||
283 | vlc->bits = nb_bits; | ||
284 | if(flags & INIT_VLC_USE_NEW_STATIC){ | ||
285 | if(vlc->table_size && vlc->table_size == vlc->table_allocated){ | ||
286 | return 0; | ||
287 | }else if(vlc->table_size){ | ||
288 | abort(); // fatal error, we are called on a partially initialized table | ||
289 | } | ||
290 | }else { | ||
291 | vlc->table = NULL; | ||
292 | vlc->table_allocated = 0; | ||
293 | vlc->table_size = 0; | ||
294 | } | ||
295 | |||
296 | #ifdef DEBUG_VLC | ||
297 | av_log(NULL,AV_LOG_DEBUG,"build table nb_codes=%d\n", nb_codes); | ||
298 | #endif | ||
299 | |||
300 | assert(symbols_size <= 2 || !symbols); | ||
301 | j = 0; | ||
302 | #define COPY(condition)\ | ||
303 | for (i = 0; i < nb_codes; i++) {\ | ||
304 | GET_DATA(buf[j].bits, bits, i, bits_wrap, bits_size);\ | ||
305 | if (!(condition))\ | ||
306 | continue;\ | ||
307 | GET_DATA(buf[j].code, codes, i, codes_wrap, codes_size);\ | ||
308 | if (flags & INIT_VLC_LE)\ | ||
309 | buf[j].code = bitswap_32(buf[j].code);\ | ||
310 | else\ | ||
311 | buf[j].code <<= 32 - buf[j].bits;\ | ||
312 | if (symbols)\ | ||
313 | GET_DATA(buf[j].symbol, symbols, i, symbols_wrap, symbols_size)\ | ||
314 | else\ | ||
315 | buf[j].symbol = i;\ | ||
316 | j++;\ | ||
317 | } | ||
318 | COPY(buf[j].bits > nb_bits); | ||
319 | // qsort is the slowest part of init_vlc, and could probably be improved or avoided | ||
320 | qsort(buf, j, sizeof(VLCcode), compare_vlcspec); | ||
321 | COPY(buf[j].bits && buf[j].bits <= nb_bits); | ||
322 | nb_codes = j; | ||
323 | |||
324 | if (build_table(vlc, nb_bits, nb_codes, buf, flags) < 0) { | ||
325 | av_freep(&vlc->table); | ||
326 | return -1; | ||
327 | } | ||
328 | if((flags & INIT_VLC_USE_NEW_STATIC) && vlc->table_size != vlc->table_allocated) | ||
329 | av_log(NULL, AV_LOG_ERROR, "needed %d had %d\n", vlc->table_size, vlc->table_allocated); | ||
330 | return 0; | ||
331 | } | ||
332 | |||
333 | |||
334 | void free_vlc(VLC *vlc) | ||
335 | { | ||
336 | av_freep(&vlc->table); | ||
337 | } | ||
338 | |||