/[pcsx2_0.9.7]/trunk/3rdparty/liba52/bit_allocate.c
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Revision 10 - (hide annotations) (download)
Mon Sep 6 11:40:06 2010 UTC (9 years, 5 months ago) by william
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exported r3113 from ./upstream/trunk
1 william 10 /*
2     * bit_allocate.c
3     * Copyright (C) 2000-2002 Michel Lespinasse <walken@zoy.org>
4     * Copyright (C) 1999-2000 Aaron Holtzman <aholtzma@ess.engr.uvic.ca>
5     *
6     * This file is part of a52dec, a free ATSC A-52 stream decoder.
7     * See http://liba52.sourceforge.net/ for updates.
8     *
9     * a52dec is free software; you can redistribute it and/or modify
10     * it under the terms of the GNU General Public License as published by
11     * the Free Software Foundation; either version 2 of the License, or
12     * (at your option) any later version.
13     *
14     * a52dec is distributed in the hope that it will be useful,
15     * but WITHOUT ANY WARRANTY; without even the implied warranty of
16     * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17     * GNU General Public License for more details.
18     *
19     * You should have received a copy of the GNU General Public License
20     * along with this program; if not, write to the Free Software
21     * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22     */
23    
24     #include "config.h"
25    
26     #include "inttypes.h"
27    
28     #include "a52.h"
29     #include "a52_internal.h"
30    
31     static int hthtab[3][50] = {
32     {0x730, 0x730, 0x7c0, 0x800, 0x820, 0x840, 0x850, 0x850, 0x860, 0x860,
33     0x860, 0x860, 0x860, 0x870, 0x870, 0x870, 0x880, 0x880, 0x890, 0x890,
34     0x8a0, 0x8a0, 0x8b0, 0x8b0, 0x8c0, 0x8c0, 0x8d0, 0x8e0, 0x8f0, 0x900,
35     0x910, 0x910, 0x910, 0x910, 0x900, 0x8f0, 0x8c0, 0x870, 0x820, 0x7e0,
36     0x7a0, 0x770, 0x760, 0x7a0, 0x7c0, 0x7c0, 0x6e0, 0x400, 0x3c0, 0x3c0},
37     {0x710, 0x710, 0x7a0, 0x7f0, 0x820, 0x830, 0x840, 0x850, 0x850, 0x860,
38     0x860, 0x860, 0x860, 0x860, 0x870, 0x870, 0x870, 0x880, 0x880, 0x880,
39     0x890, 0x890, 0x8a0, 0x8a0, 0x8b0, 0x8b0, 0x8c0, 0x8c0, 0x8e0, 0x8f0,
40     0x900, 0x910, 0x910, 0x910, 0x910, 0x900, 0x8e0, 0x8b0, 0x870, 0x820,
41     0x7e0, 0x7b0, 0x760, 0x770, 0x7a0, 0x7c0, 0x780, 0x5d0, 0x3c0, 0x3c0},
42     {0x680, 0x680, 0x750, 0x7b0, 0x7e0, 0x810, 0x820, 0x830, 0x840, 0x850,
43     0x850, 0x850, 0x860, 0x860, 0x860, 0x860, 0x860, 0x860, 0x860, 0x860,
44     0x870, 0x870, 0x870, 0x870, 0x880, 0x880, 0x880, 0x890, 0x8a0, 0x8b0,
45     0x8c0, 0x8d0, 0x8e0, 0x8f0, 0x900, 0x910, 0x910, 0x910, 0x900, 0x8f0,
46     0x8d0, 0x8b0, 0x840, 0x7f0, 0x790, 0x760, 0x7a0, 0x7c0, 0x7b0, 0x720}
47     };
48    
49     static int8_t baptab[305] = {
50     16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16,
51     16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16,
52     16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16,
53     16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16,
54     16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16,
55     16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, /* 93 padding elems */
56    
57     16, 16, 16, 16, 16, 16, 16, 16, 16, 14, 14, 14, 14, 14, 14, 14,
58     14, 12, 12, 12, 12, 11, 11, 11, 11, 10, 10, 10, 10, 9, 9, 9,
59     9, 8, 8, 8, 8, 7, 7, 7, 7, 6, 6, 6, 6, 5, 5, 5,
60     5, 4, 4, -3, -3, 3, 3, 3, -2, -2, -1, -1, -1, -1, -1, 0,
61    
62     0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
63     0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
64     0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
65     0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
66     0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
67     0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
68     0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
69     0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
70     0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
71     0, 0, 0, 0 /* 148 padding elems */
72     };
73    
74     static int bndtab[30] = {21, 22, 23, 24, 25, 26, 27, 28, 31, 34,
75     37, 40, 43, 46, 49, 55, 61, 67, 73, 79,
76     85, 97, 109, 121, 133, 157, 181, 205, 229, 253};
77    
78     static int8_t latab[256] = {
79     -64, -63, -62, -61, -60, -59, -58, -57, -56, -55, -54, -53,
80     -52, -52, -51, -50, -49, -48, -47, -47, -46, -45, -44, -44,
81     -43, -42, -41, -41, -40, -39, -38, -38, -37, -36, -36, -35,
82     -35, -34, -33, -33, -32, -32, -31, -30, -30, -29, -29, -28,
83     -28, -27, -27, -26, -26, -25, -25, -24, -24, -23, -23, -22,
84     -22, -21, -21, -21, -20, -20, -19, -19, -19, -18, -18, -18,
85     -17, -17, -17, -16, -16, -16, -15, -15, -15, -14, -14, -14,
86     -13, -13, -13, -13, -12, -12, -12, -12, -11, -11, -11, -11,
87     -10, -10, -10, -10, -10, -9, -9, -9, -9, -9, -8, -8,
88     -8, -8, -8, -8, -7, -7, -7, -7, -7, -7, -6, -6,
89     -6, -6, -6, -6, -6, -6, -5, -5, -5, -5, -5, -5,
90     -5, -5, -4, -4, -4, -4, -4, -4, -4, -4, -4, -4,
91     -4, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3,
92     -3, -3, -3, -2, -2, -2, -2, -2, -2, -2, -2, -2,
93     -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -1, -1,
94     -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
95     -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
96     -1, -1, -1, -1, -1, -1, 0, 0, 0, 0, 0, 0,
97     0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
98     0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
99     0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
100     0, 0, 0, 0
101     };
102    
103     #define UPDATE_LEAK() \
104     do { \
105     fastleak += fdecay; \
106     if (fastleak > psd + fgain) \
107     fastleak = psd + fgain; \
108     slowleak += sdecay; \
109     if (slowleak > psd + sgain) \
110     slowleak = psd + sgain; \
111     } while (0)
112    
113     #define COMPUTE_MASK() \
114     do { \
115     if (psd > dbknee) \
116     mask -= (psd - dbknee) >> 2; \
117     if (mask > hth [i >> halfrate]) \
118     mask = hth [i >> halfrate]; \
119     mask -= snroffset + 128 * deltba[i]; \
120     mask = (mask > 0) ? 0 : ((-mask) >> 5); \
121     mask -= floor; \
122     } while (0)
123    
124     void a52_bit_allocate (a52_state_t * state, ba_t * ba, int bndstart,
125     int start, int end, int fastleak, int slowleak,
126     expbap_t * expbap)
127     {
128     static int slowgain[4] = {0x540, 0x4d8, 0x478, 0x410};
129     static int dbpbtab[4] = {0xc00, 0x500, 0x300, 0x100};
130     static int floortab[8] = {0x910, 0x950, 0x990, 0x9d0,
131     0xa10, 0xa90, 0xb10, 0x1400};
132    
133     int i, j;
134     uint8_t * exp;
135     int8_t * bap;
136     int fdecay, fgain, sdecay, sgain, dbknee, floor, snroffset;
137     int psd, mask;
138     int8_t * deltba;
139     int * hth;
140     int halfrate;
141    
142     halfrate = state->halfrate;
143     fdecay = (63 + 20 * ((state->bai >> 7) & 3)) >> halfrate; /* fdcycod */
144     fgain = 128 + 128 * (ba->bai & 7); /* fgaincod */
145     sdecay = (15 + 2 * (state->bai >> 9)) >> halfrate; /* sdcycod */
146     sgain = slowgain[(state->bai >> 5) & 3]; /* sgaincod */
147     dbknee = dbpbtab[(state->bai >> 3) & 3]; /* dbpbcod */
148     hth = hthtab[state->fscod];
149     /*
150     * if there is no delta bit allocation, make deltba point to an area
151     * known to contain zeroes. baptab+156 here.
152     */
153     deltba = (ba->deltbae == DELTA_BIT_NONE) ? baptab + 156 : ba->deltba;
154     floor = floortab[state->bai & 7]; /* floorcod */
155     snroffset = 960 - 64 * state->csnroffst - 4 * (ba->bai >> 3) + floor;
156     floor >>= 5;
157    
158     exp = expbap->exp;
159     bap = expbap->bap;
160    
161     i = bndstart;
162     j = start;
163     if (start == 0) { /* not the coupling channel */
164     int lowcomp;
165    
166     lowcomp = 0;
167     j = end - 1;
168     do {
169     if (i < j) {
170     if (exp[i+1] == exp[i] - 2)
171     lowcomp = 384;
172     else if (lowcomp && (exp[i+1] > exp[i]))
173     lowcomp -= 64;
174     }
175     psd = 128 * exp[i];
176     mask = psd + fgain + lowcomp;
177     COMPUTE_MASK ();
178     bap[i] = (baptab+156)[mask + 4 * exp[i]];
179     i++;
180     } while ((i < 3) || ((i < 7) && (exp[i] > exp[i-1])));
181     fastleak = psd + fgain;
182     slowleak = psd + sgain;
183    
184     while (i < 7) {
185     if (i < j) {
186     if (exp[i+1] == exp[i] - 2)
187     lowcomp = 384;
188     else if (lowcomp && (exp[i+1] > exp[i]))
189     lowcomp -= 64;
190     }
191     psd = 128 * exp[i];
192     UPDATE_LEAK ();
193     mask = ((fastleak + lowcomp < slowleak) ?
194     fastleak + lowcomp : slowleak);
195     COMPUTE_MASK ();
196     bap[i] = (baptab+156)[mask + 4 * exp[i]];
197     i++;
198     }
199    
200     if (end == 7) /* lfe channel */
201     return;
202    
203     do {
204     if (exp[i+1] == exp[i] - 2)
205     lowcomp = 320;
206     else if (lowcomp && (exp[i+1] > exp[i]))
207     lowcomp -= 64;
208     psd = 128 * exp[i];
209     UPDATE_LEAK ();
210     mask = ((fastleak + lowcomp < slowleak) ?
211     fastleak + lowcomp : slowleak);
212     COMPUTE_MASK ();
213     bap[i] = (baptab+156)[mask + 4 * exp[i]];
214     i++;
215     } while (i < 20);
216    
217     while (lowcomp > 128) { /* two iterations maximum */
218     lowcomp -= 128;
219     psd = 128 * exp[i];
220     UPDATE_LEAK ();
221     mask = ((fastleak + lowcomp < slowleak) ?
222     fastleak + lowcomp : slowleak);
223     COMPUTE_MASK ();
224     bap[i] = (baptab+156)[mask + 4 * exp[i]];
225     i++;
226     }
227     j = i;
228     }
229    
230     do {
231     int startband, endband;
232    
233     startband = j;
234     endband = ((bndtab-20)[i] < end) ? (bndtab-20)[i] : end;
235     psd = 128 * exp[j++];
236     while (j < endband) {
237     int next, delta;
238    
239     next = 128 * exp[j++];
240     delta = next - psd;
241     switch (delta >> 9) {
242     case -6: case -5: case -4: case -3: case -2:
243     psd = next;
244     break;
245     case -1:
246     psd = next + latab[(-delta) >> 1];
247     break;
248     case 0:
249     psd += latab[delta >> 1];
250     break;
251     }
252     }
253     /* minpsd = -289 */
254     UPDATE_LEAK ();
255     mask = (fastleak < slowleak) ? fastleak : slowleak;
256     COMPUTE_MASK ();
257     i++;
258     j = startband;
259     do {
260     /* max(mask+4*exp)=147=-(minpsd+fgain-deltba-snroffset)>>5+4*exp */
261     /* min(mask+4*exp)=-156=-(sgain-deltba-snroffset)>>5 */
262     bap[j] = (baptab+156)[mask + 4 * exp[j]];
263     } while (++j < endband);
264     } while (j < end);
265     }

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