FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/aac/aacdec_proc_template.c
Date: 2026-08-30 18:45:47
Exec Total Coverage
Lines: 220 226 97.3%
Functions: 7 7 100.0%
Branches: 127 133 95.5%
Line Branch Exec Source
1 /*
2 * AAC decoder
3 * Copyright (c) 2005-2006 Oded Shimon ( ods15 ods15 dyndns org )
4 * Copyright (c) 2006-2007 Maxim Gavrilov ( maxim.gavrilov gmail com )
5 * Copyright (c) 2008-2013 Alex Converse <alex.converse@gmail.com>
6 *
7 * AAC LATM decoder
8 * Copyright (c) 2008-2010 Paul Kendall <paul@kcbbs.gen.nz>
9 * Copyright (c) 2010 Janne Grunau <janne-libav@jannau.net>
10 *
11 * AAC decoder fixed-point implementation
12 * Copyright (c) 2013
13 * MIPS Technologies, Inc., California.
14 *
15 * This file is part of FFmpeg.
16 *
17 * FFmpeg is free software; you can redistribute it and/or
18 * modify it under the terms of the GNU Lesser General Public
19 * License as published by the Free Software Foundation; either
20 * version 2.1 of the License, or (at your option) any later version.
21 *
22 * FFmpeg is distributed in the hope that it will be useful,
23 * but WITHOUT ANY WARRANTY; without even the implied warranty of
24 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
25 * Lesser General Public License for more details.
26 *
27 * You should have received a copy of the GNU Lesser General Public
28 * License along with FFmpeg; if not, write to the Free Software
29 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
30 */
31
32 /**
33 * linear congruential pseudorandom number generator
34 *
35 * @param previous_val pointer to the current state of the generator
36 *
37 * @return Returns a 32-bit pseudorandom integer
38 */
39 5970272 static av_always_inline int lcg_random(unsigned previous_val)
40 {
41 5970272 union { unsigned u; int s; } v = { previous_val * 1664525u + 1013904223 };
42 5970272 return v.s;
43 }
44
45 /**
46 * Decode spectral data; reference: table 4.50.
47 * Dequantize and scale spectral data; reference: 4.6.3.3.
48 *
49 * @param coef array of dequantized, scaled spectral data
50 * @param sf array of scalefactors or intensity stereo positions
51 * @param pulse_present set if pulses are present
52 * @param pulse pointer to pulse data struct
53 * @param band_type array of the used band type
54 *
55 * @return Returns error status. 0 - OK, !0 - error
56 */
57 93489 static int AAC_RENAME(decode_spectrum_and_dequant)(AACDecContext *ac,
58 GetBitContext *gb,
59 const Pulse *pulse,
60 SingleChannelElement *sce)
61 {
62 93489 int i, k, g, idx = 0;
63 93489 INTFLOAT *coef = sce->AAC_RENAME(coeffs);
64 93489 IndividualChannelStream *ics = &sce->ics;
65 93489 const int c = 1024 / ics->num_windows;
66 93489 const uint16_t *offsets = ics->swb_offset;
67 93489 const INTFLOAT *sf = sce->AAC_RENAME(sf);
68 93489 const enum BandType *band_type = sce->band_type;
69 93489 INTFLOAT *coef_base = coef;
70
71
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 202308 for (g = 0; g < ics->num_windows; g++)
72 108819 memset(coef + g * 128 + offsets[ics->max_sfb], 0,
73 108819 sizeof(INTFLOAT) * (c - offsets[ics->max_sfb]));
74
75
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 192525 for (g = 0; g < ics->num_window_groups; g++) {
76 99036 unsigned g_len = ics->group_len[g];
77
78
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 3553425 for (i = 0; i < ics->max_sfb; i++, idx++) {
79 3454389 const unsigned cbt_m1 = band_type[idx] - 1;
80 3454389 INTFLOAT *cfo = coef + offsets[i];
81 3454389 int off_len = offsets[i + 1] - offsets[i];
82 int group;
83
84
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 3454389 if (cbt_m1 >= INTENSITY_BT2 - 1) {
85
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 1259716 for (group = 0; group < (AAC_SIGNE)g_len; group++, cfo+=128) {
86 649614 memset(cfo, 0, off_len * sizeof(*cfo));
87 }
88
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 2844287 } else if (cbt_m1 == NOISE_BT - 1) {
89
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 564645 for (group = 0; group < (AAC_SIGNE)g_len; group++, cfo+=128) {
90 INTFLOAT band_energy;
91 #if USE_FIXED
92
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 3021407 for (k = 0; k < off_len; k++) {
93 2883476 ac->random_state = lcg_random(ac->random_state);
94 2883476 cfo[k] = ac->random_state >> 3;
95 }
96
97 137931 band_energy = ac->fdsp->scalarproduct_fixed(cfo, cfo, off_len);
98 137931 band_energy = fixed_sqrt(band_energy, 31);
99 137931 noise_scale(cfo, sf[idx], band_energy, off_len);
100 #else
101 float scale;
102
103
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 3231212 for (k = 0; k < off_len; k++) {
104 3086796 ac->random_state = lcg_random(ac->random_state);
105 3086796 cfo[k] = ac->random_state;
106 }
107
108 144416 band_energy = ac->fdsp->scalarproduct_float(cfo, cfo, off_len);
109 144416 scale = sf[idx] / sqrtf(band_energy);
110 144416 ac->fdsp->vector_fmul_scalar(cfo, cfo, scale, off_len);
111 #endif /* USE_FIXED */
112 }
113 } else {
114 #if !USE_FIXED
115 1785706 const float *vq = ff_aac_codebook_vector_vals[cbt_m1];
116 #endif /* !USE_FIXED */
117 2561989 const VLCElem *vlc_tab = ff_vlc_spectral[cbt_m1];
118 2561989 OPEN_READER(re, gb);
119
120
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 2561989 switch (cbt_m1 >> 1) {
121 619066 case 0:
122
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 1266872 for (group = 0; group < (AAC_SIGNE)g_len; group++, cfo+=128) {
123 647806 INTFLOAT *cf = cfo;
124 647806 int len = off_len;
125
126 do {
127 int code;
128 unsigned cb_idx;
129
130 3174349 UPDATE_CACHE(re, gb);
131
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 3174349 GET_VLC(code, re, gb, vlc_tab, 8, 2);
132 3174349 cb_idx = code;
133 #if USE_FIXED
134 979225 cf = DEC_SQUAD(cf, cb_idx);
135 #else
136 2195124 cf = VMUL4(cf, vq, cb_idx, sf + idx);
137 #endif /* USE_FIXED */
138
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 3174349 } while (len -= 4);
139 }
140 619066 break;
141
142 573510 case 1:
143
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 1161350 for (group = 0; group < (AAC_SIGNE)g_len; group++, cfo+=128) {
144 587840 INTFLOAT *cf = cfo;
145 587840 int len = off_len;
146
147 do {
148 int code;
149 unsigned nnz;
150 unsigned cb_idx;
151 uint32_t bits;
152
153 2601229 UPDATE_CACHE(re, gb);
154
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 2601229 GET_VLC(code, re, gb, vlc_tab, 8, 2);
155 2601229 cb_idx = code;
156 2601229 nnz = cb_idx >> 8 & 15;
157
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 2601229 bits = nnz ? GET_CACHE(re, gb) : 0;
158 2601229 LAST_SKIP_BITS(re, gb, nnz);
159 #if USE_FIXED
160 818091 cf = DEC_UQUAD(cf, cb_idx, bits);
161 #else
162 1783138 cf = VMUL4S(cf, vq, cb_idx, bits, sf + idx);
163 #endif /* USE_FIXED */
164
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 2601229 } while (len -= 4);
165 }
166 573510 break;
167
168 392012 case 2:
169
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 797704 for (group = 0; group < (AAC_SIGNE)g_len; group++, cfo+=128) {
170 405692 INTFLOAT *cf = cfo;
171 405692 int len = off_len;
172
173 do {
174 int code;
175 unsigned cb_idx;
176
177 2452146 UPDATE_CACHE(re, gb);
178
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 2452146 GET_VLC(code, re, gb, vlc_tab, 8, 2);
179 2452146 cb_idx = code;
180 #if USE_FIXED
181 680176 cf = DEC_SPAIR(cf, cb_idx);
182 #else
183 1771970 cf = VMUL2(cf, vq, cb_idx, sf + idx);
184 #endif /* USE_FIXED */
185
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 2452146 } while (len -= 2);
186 }
187 392012 break;
188
189 540603 case 3:
190 case 4:
191
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 1100338 for (group = 0; group < (AAC_SIGNE)g_len; group++, cfo+=128) {
192 559735 INTFLOAT *cf = cfo;
193 559735 int len = off_len;
194
195 do {
196 int code;
197 unsigned nnz;
198 unsigned cb_idx;
199 unsigned sign;
200
201 2987038 UPDATE_CACHE(re, gb);
202
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 2987038 GET_VLC(code, re, gb, vlc_tab, 8, 2);
203 2987038 cb_idx = code;
204 2987038 nnz = cb_idx >> 8 & 15;
205
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 2987038 sign = nnz ? SHOW_UBITS(re, gb, nnz) << (cb_idx >> 12) : 0;
206 2987038 LAST_SKIP_BITS(re, gb, nnz);
207 #if USE_FIXED
208 714422 cf = DEC_UPAIR(cf, cb_idx, sign);
209 #else
210 2272616 cf = VMUL2S(cf, vq, cb_idx, sign, sf + idx);
211 #endif /* USE_FIXED */
212
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 2987038 } while (len -= 2);
213 }
214 540603 break;
215
216 436798 default:
217
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 883929 for (group = 0; group < (AAC_SIGNE)g_len; group++, cfo+=128) {
218 #if USE_FIXED
219 120135 int *icf = cfo;
220 int v;
221 #else
222 326996 float *cf = cfo;
223 326996 uint32_t *icf = (uint32_t *) cf;
224 #endif /* USE_FIXED */
225 447131 int len = off_len;
226
227 do {
228 int code;
229 unsigned nzt, nnz;
230 unsigned cb_idx;
231 uint32_t bits;
232 int j;
233
234 1492274 UPDATE_CACHE(re, gb);
235
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 1492274 GET_VLC(code, re, gb, vlc_tab, 8, 2);
236 1492274 cb_idx = code;
237
238
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 1492274 if (cb_idx == 0x0000) {
239 81641 *icf++ = 0;
240 81641 *icf++ = 0;
241 81641 continue;
242 }
243
244 1410633 nnz = cb_idx >> 12;
245 1410633 nzt = cb_idx >> 8;
246 1410633 bits = SHOW_UBITS(re, gb, nnz) << (32-nnz);
247 1410633 LAST_SKIP_BITS(re, gb, nnz);
248
249
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 4231899 for (j = 0; j < 2; j++) {
250
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 2821266 if (nzt & 1<<j) {
251 uint32_t b;
252 int n;
253 /* The total length of escape_sequence must be < 22 bits according
254 to the specification (i.e. max is 111111110xxxxxxxxxxxx). */
255 368237 UPDATE_CACHE(re, gb);
256 368237 b = GET_CACHE(re, gb);
257 368237 b = 31 - av_log2(~b);
258
259
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 368237 if (b > 8) {
260 ✗ av_log(ac->avctx, AV_LOG_ERROR, "error in spectral data, ESC overflow\n");
261 ✗ return AVERROR_INVALIDDATA;
262 }
263
264 368237 SKIP_BITS(re, gb, b + 1);
265 368237 b += 4;
266 368237 n = (1 << b) + SHOW_UBITS(re, gb, b);
267 368237 LAST_SKIP_BITS(re, gb, b);
268 #if USE_FIXED
269 67139 v = n;
270
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 67139 if (bits & 1U<<31)
271 33448 v = -v;
272 67139 *icf++ = v;
273 #else
274 301098 *icf++ = ff_cbrt_tab[n] | (bits & 1U<<31);
275 #endif /* USE_FIXED */
276 368237 bits <<= 1;
277 } else {
278 #if USE_FIXED
279 543831 v = cb_idx & 15;
280
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 543831 if (bits & 1U<<31)
281 258510 v = -v;
282 543831 *icf++ = v;
283 #else
284 1909198 unsigned v = ((const uint32_t*)vq)[cb_idx & 15];
285 1909198 *icf++ = (bits & 1U<<31) | v;
286 #endif /* USE_FIXED */
287 2453029 bits <<= !!v;
288 }
289 2821266 cb_idx >>= 4;
290 }
291
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 1492274 } while (len -= 2);
292 #if !USE_FIXED
293 326996 ac->fdsp->vector_fmul_scalar(cfo, cfo, sf[idx], off_len);
294 #endif /* !USE_FIXED */
295 }
296 }
297
298 2561989 CLOSE_READER(re, gb);
299 }
300 }
301 99036 coef += g_len << 7;
302 }
303
304
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 93489 if (pulse) {
305 1098 idx = 0;
306
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 3842 for (i = 0; i < pulse->num_pulse; i++) {
307 2744 INTFLOAT co = coef_base[ pulse->pos[i] ];
308
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 6840 while (offsets[idx + 1] <= pulse->pos[i])
309 4096 idx++;
310
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 2744 if (band_type[idx] != NOISE_BT && sf[idx]) {
311 2668 INTFLOAT ico = -pulse->amp[i];
312 #if USE_FIXED
313
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 864 if (co) {
314
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 730 ico = co + (co > 0 ? -ico : ico);
315 }
316 864 coef_base[ pulse->pos[i] ] = ico;
317 #else
318
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 1804 if (co) {
319 1564 co /= sf[idx];
320
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 1564 ico = co / sqrtf(sqrtf(fabsf(co))) + (co > 0 ? -ico : ico);
321 }
322 1804 coef_base[ pulse->pos[i] ] = cbrtf(fabsf(ico)) * ico * sf[idx];
323 #endif /* USE_FIXED */
324 }
325 }
326 }
327 #if USE_FIXED
328 28898 coef = coef_base;
329 28898 idx = 0;
330
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 60128 for (g = 0; g < ics->num_window_groups; g++) {
331 31230 unsigned g_len = ics->group_len[g];
332
333
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 1078271 for (i = 0; i < ics->max_sfb; i++, idx++) {
334 1047041 const unsigned cbt_m1 = band_type[idx] - 1;
335 1047041 int *cfo = coef + offsets[i];
336 1047041 int off_len = offsets[i + 1] - offsets[i];
337 int group;
338
339
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 1047041 if (cbt_m1 < NOISE_BT - 1) {
340
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 1567837 for (group = 0; group < (int)g_len; group++, cfo+=128) {
341 791554 vector_pow43(cfo, off_len);
342 791554 subband_scale(cfo, cfo, sf[idx], 34, off_len, ac->avctx);
343 }
344 }
345 }
346 31230 coef += g_len << 7;
347 }
348 #endif /* USE_FIXED */
349 93489 return 0;
350 }
351
352 /**
353 * Decode coupling_channel_element; reference: table 4.8.
354 *
355 * @return Returns error status. 0 - OK, !0 - error
356 */
357 1174 static int AAC_RENAME(decode_cce)(AACDecContext *ac, GetBitContext *gb, ChannelElement *che)
358 {
359 1174 int num_gain = 0;
360 int c, g, sfb, ret;
361 int sign;
362 INTFLOAT scale;
363 1174 SingleChannelElement *sce = &che->ch[0];
364 1174 ChannelCoupling *coup = &che->coup;
365
366 1174 coup->coupling_point = 2 * get_bits1(gb);
367 1174 coup->num_coupled = get_bits(gb, 3);
368
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 3915 for (c = 0; c <= coup->num_coupled; c++) {
369 2741 num_gain++;
370 2741 coup->type[c] = get_bits1(gb) ? TYPE_CPE : TYPE_SCE;
371 2741 coup->id_select[c] = get_bits(gb, 4);
372
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 2741 if (coup->type[c] == TYPE_CPE) {
373 2348 coup->ch_select[c] = get_bits(gb, 2);
374
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 2348 if (coup->ch_select[c] == 3)
375 1967 num_gain++;
376 } else
377 393 coup->ch_select[c] = 2;
378 }
379
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 1174 coup->coupling_point += get_bits1(gb) || (coup->coupling_point >> 1);
380
381 1174 sign = get_bits(gb, 1);
382 #if USE_FIXED
383 130 scale = get_bits(gb, 2);
384 #else
385 1044 scale = cce_scale[get_bits(gb, 2)];
386 #endif
387
388
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 1174 if ((ret = ff_aac_decode_ics(ac, sce, gb, 0, 0)))
389 ✗ return ret;
390
391
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 5882 for (c = 0; c < num_gain; c++) {
392 4708 int idx = 0;
393 4708 int cge = 1;
394 4708 int gain = 0;
395 4708 INTFLOAT gain_cache = FIXR10(1.);
396
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 4708 if (c) {
397
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 3534 cge = coup->coupling_point == AFTER_IMDCT ? 1 : get_bits1(gb);
398
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 3534 gain = cge ? get_vlc2(gb, ff_vlc_scalefactors, 7, 3) - 60: 0;
399 3534 gain_cache = GET_GAIN(scale, gain);
400 #if USE_FIXED
401
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 520 if ((abs(gain_cache)-1024) >> 3 > 30)
402 ✗ return AVERROR(ERANGE);
403 #endif
404 }
405
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 4708 if (coup->coupling_point == AFTER_IMDCT) {
406 1965 coup->gain[c][0] = gain_cache;
407 } else {
408
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 5486 for (g = 0; g < sce->ics.num_window_groups; g++) {
409
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 112463 for (sfb = 0; sfb < sce->ics.max_sfb; sfb++, idx++) {
410
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 109720 if (sce->band_type[idx] != ZERO_BT) {
411
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 5196 if (!cge) {
412 2879 int t = get_vlc2(gb, ff_vlc_scalefactors, 7, 3) - 60;
413
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 2879 if (t) {
414 2724 int s = 1;
415 2724 t = gain += t;
416
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 2724 if (sign) {
417 1666 s -= 2 * (t & 0x1);
418 1666 t >>= 1;
419 }
420 2724 gain_cache = GET_GAIN(scale, t) * s;
421 #if USE_FIXED
422 ✗ if ((abs(gain_cache)-1024) >> 3 > 30)
423 ✗ return AVERROR(ERANGE);
424 #endif
425 }
426 }
427 5196 coup->gain[c][idx] = gain_cache;
428 }
429 }
430 }
431 }
432 }
433 1174 return 0;
434 }
435
436 376 static av_cold void AAC_RENAME(aac_proc_init)(AACDecProc *aac_proc)
437 {
438 #define SET(member) aac_proc->member = AAC_RENAME(member)
439 376 SET(decode_spectrum_and_dequant);
440 376 SET(decode_cce);
441 #undef SET
442 #define SET(member) aac_proc->member = AV_JOIN(ff_aac_, AAC_RENAME(member));
443 376 SET(sbr_ctx_alloc_init);
444 376 SET(sbr_decode_extension);
445 376 SET(sbr_apply);
446 376 SET(sbr_ctx_close);
447 #undef SET
448 376 }
449