FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/mpegaudiodec_template.c
Date: 2024-04-25 15:36:26
Exec Total Coverage
Lines: 687 1007 68.2%
Functions: 25 31 80.6%
Branches: 349 548 63.7%
Line Branch Exec Source
1 /*
2 * MPEG Audio decoder
3 * Copyright (c) 2001, 2002 Fabrice Bellard
4 *
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22 /**
23 * @file
24 * MPEG Audio decoder
25 */
26
27 #include "config_components.h"
28
29 #include "libavutil/attributes.h"
30 #include "libavutil/avassert.h"
31 #include "libavutil/channel_layout.h"
32 #include "libavutil/crc.h"
33 #include "libavutil/float_dsp.h"
34 #include "libavutil/libm.h"
35 #include "libavutil/mem.h"
36 #include "libavutil/mem_internal.h"
37 #include "libavutil/thread.h"
38
39 #include "avcodec.h"
40 #include "decode.h"
41 #include "get_bits.h"
42 #include "mathops.h"
43 #include "mpegaudiodsp.h"
44
45 /*
46 * TODO:
47 * - test lsf / mpeg25 extensively.
48 */
49
50 #include "mpegaudio.h"
51 #include "mpegaudiodecheader.h"
52
53 #define BACKSTEP_SIZE 512
54 #define EXTRABYTES 24
55 #define LAST_BUF_SIZE 2 * BACKSTEP_SIZE + EXTRABYTES
56
57 /* layer 3 "granule" */
58 typedef struct GranuleDef {
59 uint8_t scfsi;
60 int part2_3_length;
61 int big_values;
62 int global_gain;
63 int scalefac_compress;
64 uint8_t block_type;
65 uint8_t switch_point;
66 int table_select[3];
67 int subblock_gain[3];
68 uint8_t scalefac_scale;
69 uint8_t count1table_select;
70 int region_size[3]; /* number of huffman codes in each region */
71 int preflag;
72 int short_start, long_end; /* long/short band indexes */
73 uint8_t scale_factors[40];
74 DECLARE_ALIGNED(16, INTFLOAT, sb_hybrid)[SBLIMIT * 18]; /* 576 samples */
75 } GranuleDef;
76
77 typedef struct MPADecodeContext {
78 MPA_DECODE_HEADER
79 uint8_t last_buf[LAST_BUF_SIZE];
80 int last_buf_size;
81 int extrasize;
82 /* next header (used in free format parsing) */
83 uint32_t free_format_next_header;
84 GetBitContext gb;
85 GetBitContext in_gb;
86 DECLARE_ALIGNED(32, MPA_INT, synth_buf)[MPA_MAX_CHANNELS][512 * 2];
87 int synth_buf_offset[MPA_MAX_CHANNELS];
88 DECLARE_ALIGNED(32, INTFLOAT, sb_samples)[MPA_MAX_CHANNELS][36][SBLIMIT];
89 INTFLOAT mdct_buf[MPA_MAX_CHANNELS][SBLIMIT * 18]; /* previous samples, for layer 3 MDCT */
90 GranuleDef granules[2][2]; /* Used in Layer 3 */
91 int adu_mode; ///< 0 for standard mp3, 1 for adu formatted mp3
92 int dither_state;
93 int err_recognition;
94 AVCodecContext* avctx;
95 MPADSPContext mpadsp;
96 void (*butterflies_float)(float *restrict v1, float *restrict v2, int len);
97 AVFrame *frame;
98 uint32_t crc;
99 } MPADecodeContext;
100
101 #define HEADER_SIZE 4
102
103 #include "mpegaudiodata.h"
104
105 #include "mpegaudio_tablegen.h"
106 /* intensity stereo coef table */
107 static INTFLOAT is_table_lsf[2][2][16];
108
109 /* [i][j]: 2^(-j/3) * FRAC_ONE * 2^(i+2) / (2^(i+2) - 1) */
110 static int32_t scale_factor_mult[15][3];
111 /* mult table for layer 2 group quantization */
112
113 #define SCALE_GEN(v) \
114 { FIXR_OLD(1.0 * (v)), FIXR_OLD(0.7937005259 * (v)), FIXR_OLD(0.6299605249 * (v)) }
115
116 static const int32_t scale_factor_mult2[3][3] = {
117 SCALE_GEN(4.0 / 3.0), /* 3 steps */
118 SCALE_GEN(4.0 / 5.0), /* 5 steps */
119 SCALE_GEN(4.0 / 9.0), /* 9 steps */
120 };
121
122 /**
123 * Convert region offsets to region sizes and truncate
124 * size to big_values.
125 */
126 8146 static void region_offset2size(GranuleDef *g)
127 {
128 8146 int i, k, j = 0;
129 8146 g->region_size[2] = 576 / 2;
130
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 32584 for (i = 0; i < 3; i++) {
131 24438 k = FFMIN(g->region_size[i], g->big_values);
132 24438 g->region_size[i] = k - j;
133 24438 j = k;
134 }
135 8146 }
136
137 861 static void init_short_region(MPADecodeContext *s, GranuleDef *g)
138 {
139
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 861 if (g->block_type == 2) {
140
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 313 if (s->sample_rate_index != 8)
141 313 g->region_size[0] = (36 / 2);
142 else
143 ✗ g->region_size[0] = (72 / 2);
144 } else {
145
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 548 if (s->sample_rate_index <= 2)
146 547 g->region_size[0] = (36 / 2);
147
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 1 else if (s->sample_rate_index != 8)
148 1 g->region_size[0] = (54 / 2);
149 else
150 ✗ g->region_size[0] = (108 / 2);
151 }
152 861 g->region_size[1] = (576 / 2);
153 861 }
154
155 7285 static void init_long_region(MPADecodeContext *s, GranuleDef *g,
156 int ra1, int ra2)
157 {
158 int l;
159 7285 g->region_size[0] = ff_band_index_long[s->sample_rate_index][ra1 + 1];
160 /* should not overflow */
161 7285 l = FFMIN(ra1 + ra2 + 2, 22);
162 7285 g->region_size[1] = ff_band_index_long[s->sample_rate_index][ l];
163 7285 }
164
165 8146 static void compute_band_indexes(MPADecodeContext *s, GranuleDef *g)
166 {
167
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 8146 if (g->block_type == 2) {
168
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 313 if (g->switch_point) {
169
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 13 if(s->sample_rate_index == 8)
170 ✗ avpriv_request_sample(s->avctx, "switch point in 8khz");
171 /* if switched mode, we handle the 36 first samples as
172 long blocks. For 8000Hz, we handle the 72 first
173 exponents as long blocks */
174
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 13 if (s->sample_rate_index <= 2)
175 13 g->long_end = 8;
176 else
177 ✗ g->long_end = 6;
178
179 13 g->short_start = 3;
180 } else {
181 300 g->long_end = 0;
182 300 g->short_start = 0;
183 }
184 } else {
185 7833 g->short_start = 13;
186 7833 g->long_end = 22;
187 }
188 8146 }
189
190 /* layer 1 unscaling */
191 /* n = number of bits of the mantissa minus 1 */
192 5034960 static inline int l1_unscale(int n, int mant, int scale_factor)
193 {
194 int shift, mod;
195 int64_t val;
196
197 5034960 shift = ff_scale_factor_modshift[scale_factor];
198 5034960 mod = shift & 3;
199 5034960 shift >>= 2;
200 5034960 val = MUL64((int)(mant + (-1U << n) + 1), scale_factor_mult[n-1][mod]);
201 5034960 shift += n;
202 /* NOTE: at this point, 1 <= shift >= 21 + 15 */
203 5034960 return (int)((val + (1LL << (shift - 1))) >> shift);
204 }
205
206 908784 static inline int l2_unscale_group(int steps, int mant, int scale_factor)
207 {
208 int shift, mod, val;
209
210 908784 shift = ff_scale_factor_modshift[scale_factor];
211 908784 mod = shift & 3;
212 908784 shift >>= 2;
213
214 908784 val = (mant - (steps >> 1)) * scale_factor_mult2[steps >> 2][mod];
215 /* NOTE: at this point, 0 <= shift <= 21 */
216
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 908784 if (shift > 0)
217 908784 val = (val + (1 << (shift - 1))) >> shift;
218 908784 return val;
219 }
220
221 /* compute value^(4/3) * 2^(exponent/4). It normalized to FRAC_BITS */
222 56891 static inline int l3_unscale(int value, int exponent)
223 {
224 unsigned int m;
225 int e;
226
227 56891 e = ff_table_4_3_exp [4 * value + (exponent & 3)];
228 56891 m = ff_table_4_3_value[4 * value + (exponent & 3)];
229 56891 e -= exponent >> 2;
230 #ifdef DEBUG
231 if(e < 1)
232 av_log(NULL, AV_LOG_WARNING, "l3_unscale: e is %d\n", e);
233 #endif
234
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 56891 if (e > (SUINT)31)
235 10 return 0;
236 56881 m = (m + ((1U << e) >> 1)) >> e;
237
238 56881 return m;
239 }
240
241 108 static av_cold void decode_init_static(void)
242 {
243 int i, j;
244
245 /* scale factor multiply for layer 1 */
246
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 1728 for (i = 0; i < 15; i++) {
247 int n, norm;
248 1620 n = i + 2;
249 1620 norm = ((INT64_C(1) << n) * FRAC_ONE) / ((1 << n) - 1);
250 1620 scale_factor_mult[i][0] = MULLx(norm, FIXR(1.0 * 2.0), FRAC_BITS);
251 1620 scale_factor_mult[i][1] = MULLx(norm, FIXR(0.7937005259 * 2.0), FRAC_BITS);
252 1620 scale_factor_mult[i][2] = MULLx(norm, FIXR(0.6299605249 * 2.0), FRAC_BITS);
253 ff_dlog(NULL, "%d: norm=%x s=%"PRIx32" %"PRIx32" %"PRIx32"\n", i,
254 (unsigned)norm,
255 scale_factor_mult[i][0],
256 scale_factor_mult[i][1],
257 scale_factor_mult[i][2]);
258 }
259
260 /* compute n ^ (4/3) and store it in mantissa/exp format */
261
262 108 mpegaudio_tableinit();
263
264
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 1836 for (i = 0; i < 16; i++) {
265 double f;
266 int e, k;
267
268
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 5184 for (j = 0; j < 2; j++) {
269 3456 e = -(j + 1) * ((i + 1) >> 1);
270 3456 f = exp2(e / 4.0);
271 3456 k = i & 1;
272 3456 is_table_lsf[j][k ^ 1][i] = FIXR(f);
273 3456 is_table_lsf[j][k ][i] = FIXR(1.0);
274 ff_dlog(NULL, "is_table_lsf %d %d: %f %f\n",
275 i, j, (float) is_table_lsf[j][0][i],
276 (float) is_table_lsf[j][1][i]);
277 }
278 }
279 108 RENAME(ff_mpa_synth_init)();
280 108 ff_mpegaudiodec_common_init_static();
281 108 }
282
283 146 static av_cold int decode_init(AVCodecContext * avctx)
284 {
285 static AVOnce init_static_once = AV_ONCE_INIT;
286 146 MPADecodeContext *s = avctx->priv_data;
287
288 146 s->avctx = avctx;
289
290 #if USE_FLOATS
291 {
292 AVFloatDSPContext *fdsp;
293 82 fdsp = avpriv_float_dsp_alloc(avctx->flags & AV_CODEC_FLAG_BITEXACT);
294
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 82 if (!fdsp)
295 ✗ return AVERROR(ENOMEM);
296 82 s->butterflies_float = fdsp->butterflies_float;
297 82 av_free(fdsp);
298 }
299 #endif
300
301 146 ff_mpadsp_init(&s->mpadsp);
302
303
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 146 if (avctx->request_sample_fmt == OUT_FMT &&
304 ✗ avctx->codec_id != AV_CODEC_ID_MP3ON4)
305 ✗ avctx->sample_fmt = OUT_FMT;
306 else
307 146 avctx->sample_fmt = OUT_FMT_P;
308 146 s->err_recognition = avctx->err_recognition;
309
310
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 146 if (avctx->codec_id == AV_CODEC_ID_MP3ADU)
311 ✗ s->adu_mode = 1;
312
313 146 ff_thread_once(&init_static_once, decode_init_static);
314
315 146 return 0;
316 }
317
318 #define C3 FIXHR(0.86602540378443864676/2)
319 #define C4 FIXHR(0.70710678118654752439/2) //0.5 / cos(pi*(9)/36)
320 #define C5 FIXHR(0.51763809020504152469/2) //0.5 / cos(pi*(5)/36)
321 #define C6 FIXHR(1.93185165257813657349/4) //0.5 / cos(pi*(15)/36)
322
323 /* 12 points IMDCT. We compute it "by hand" by factorizing obvious
324 cases. */
325 19854 static void imdct12(INTFLOAT *out, SUINTFLOAT *in)
326 {
327 SUINTFLOAT in0, in1, in2, in3, in4, in5, t1, t2;
328
329 19854 in0 = in[0*3];
330 19854 in1 = in[1*3] + in[0*3];
331 19854 in2 = in[2*3] + in[1*3];
332 19854 in3 = in[3*3] + in[2*3];
333 19854 in4 = in[4*3] + in[3*3];
334 19854 in5 = in[5*3] + in[4*3];
335 19854 in5 += in3;
336 19854 in3 += in1;
337
338 19854 in2 = MULH3(in2, C3, 2);
339 19854 in3 = MULH3(in3, C3, 4);
340
341 19854 t1 = in0 - in4;
342 19854 t2 = MULH3(in1 - in5, C4, 2);
343
344 19854 out[ 7] =
345 19854 out[10] = t1 + t2;
346 19854 out[ 1] =
347 19854 out[ 4] = t1 - t2;
348
349 19854 in0 += SHR(in4, 1);
350 19854 in4 = in0 + in2;
351 19854 in5 += 2*in1;
352 19854 in1 = MULH3(in5 + in3, C5, 1);
353 19854 out[ 8] =
354 19854 out[ 9] = in4 + in1;
355 19854 out[ 2] =
356 19854 out[ 3] = in4 - in1;
357
358 19854 in0 -= in2;
359 19854 in5 = MULH3(in5 - in3, C6, 2);
360 19854 out[ 0] =
361 19854 out[ 5] = in0 - in5;
362 19854 out[ 6] =
363 19854 out[11] = in0 + in5;
364 19854 }
365
366 10137 static int handle_crc(MPADecodeContext *s, int sec_len)
367 {
368
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 10137 if (s->error_protection && (s->err_recognition & AV_EF_CRCCHECK)) {
369 ✗ const uint8_t *buf = s->gb.buffer - HEADER_SIZE;
370 ✗ int sec_byte_len = sec_len >> 3;
371 ✗ int sec_rem_bits = sec_len & 7;
372 ✗ const AVCRC *crc_tab = av_crc_get_table(AV_CRC_16_ANSI);
373 uint8_t tmp_buf[4];
374 ✗ uint32_t crc_val = av_crc(crc_tab, UINT16_MAX, &buf[2], 2);
375 ✗ crc_val = av_crc(crc_tab, crc_val, &buf[6], sec_byte_len);
376
377 ✗ AV_WB32(tmp_buf,
378 ((buf[6 + sec_byte_len] & (0xFF00U >> sec_rem_bits)) << 24) +
379 ((s->crc << 16) >> sec_rem_bits));
380
381 ✗ crc_val = av_crc(crc_tab, crc_val, tmp_buf, 3);
382
383 ✗ if (crc_val) {
384 ✗ av_log(s->avctx, AV_LOG_ERROR, "CRC mismatch %X!\n", crc_val);
385 ✗ if (s->err_recognition & AV_EF_EXPLODE)
386 ✗ return AVERROR_INVALIDDATA;
387 }
388 }
389 10137 return 0;
390 }
391
392 /* return the number of decoded frames */
393 ✗ static int mp_decode_layer1(MPADecodeContext *s)
394 {
395 int bound, i, v, n, ch, j, mant;
396 uint8_t allocation[MPA_MAX_CHANNELS][SBLIMIT];
397 uint8_t scale_factors[MPA_MAX_CHANNELS][SBLIMIT];
398 int ret;
399
400 ✗ ret = handle_crc(s, (s->nb_channels == 1) ? 8*16 : 8*32);
401 ✗ if (ret < 0)
402 ✗ return ret;
403
404 ✗ if (s->mode == MPA_JSTEREO)
405 ✗ bound = (s->mode_ext + 1) * 4;
406 else
407 ✗ bound = SBLIMIT;
408
409 /* allocation bits */
410 ✗ for (i = 0; i < bound; i++) {
411 ✗ for (ch = 0; ch < s->nb_channels; ch++) {
412 ✗ allocation[ch][i] = get_bits(&s->gb, 4);
413 }
414 }
415 ✗ for (i = bound; i < SBLIMIT; i++)
416 ✗ allocation[0][i] = get_bits(&s->gb, 4);
417
418 /* scale factors */
419 ✗ for (i = 0; i < bound; i++) {
420 ✗ for (ch = 0; ch < s->nb_channels; ch++) {
421 ✗ if (allocation[ch][i])
422 ✗ scale_factors[ch][i] = get_bits(&s->gb, 6);
423 }
424 }
425 ✗ for (i = bound; i < SBLIMIT; i++) {
426 ✗ if (allocation[0][i]) {
427 ✗ scale_factors[0][i] = get_bits(&s->gb, 6);
428 ✗ scale_factors[1][i] = get_bits(&s->gb, 6);
429 }
430 }
431
432 /* compute samples */
433 ✗ for (j = 0; j < 12; j++) {
434 ✗ for (i = 0; i < bound; i++) {
435 ✗ for (ch = 0; ch < s->nb_channels; ch++) {
436 ✗ n = allocation[ch][i];
437 ✗ if (n) {
438 ✗ mant = get_bits(&s->gb, n + 1);
439 ✗ v = l1_unscale(n, mant, scale_factors[ch][i]);
440 } else {
441 ✗ v = 0;
442 }
443 ✗ s->sb_samples[ch][j][i] = v;
444 }
445 }
446 ✗ for (i = bound; i < SBLIMIT; i++) {
447 ✗ n = allocation[0][i];
448 ✗ if (n) {
449 ✗ mant = get_bits(&s->gb, n + 1);
450 ✗ v = l1_unscale(n, mant, scale_factors[0][i]);
451 ✗ s->sb_samples[0][j][i] = v;
452 ✗ v = l1_unscale(n, mant, scale_factors[1][i]);
453 ✗ s->sb_samples[1][j][i] = v;
454 } else {
455 ✗ s->sb_samples[0][j][i] = 0;
456 ✗ s->sb_samples[1][j][i] = 0;
457 }
458 }
459 }
460 ✗ return 12;
461 }
462
463 7323 static int mp_decode_layer2(MPADecodeContext *s)
464 {
465 int sblimit; /* number of used subbands */
466 const unsigned char *alloc_table;
467 int table, bit_alloc_bits, i, j, ch, bound, v;
468 unsigned char bit_alloc[MPA_MAX_CHANNELS][SBLIMIT];
469 unsigned char scale_code[MPA_MAX_CHANNELS][SBLIMIT];
470 unsigned char scale_factors[MPA_MAX_CHANNELS][SBLIMIT][3], *sf;
471 int scale, qindex, bits, steps, k, l, m, b;
472 int ret;
473
474 /* select decoding table */
475 7323 table = ff_mpa_l2_select_table(s->bit_rate / 1000, s->nb_channels,
476 s->sample_rate, s->lsf);
477 7323 sblimit = ff_mpa_sblimit_table[table];
478 7323 alloc_table = ff_mpa_alloc_tables[table];
479
480
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 7323 if (s->mode == MPA_JSTEREO)
481 ✗ bound = (s->mode_ext + 1) * 4;
482 else
483 7323 bound = sblimit;
484
485 ff_dlog(s->avctx, "bound=%d sblimit=%d\n", bound, sblimit);
486
487 /* sanity check */
488
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 7323 if (bound > sblimit)
489 ✗ bound = sblimit;
490
491 /* parse bit allocation */
492 7323 j = 0;
493
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 224253 for (i = 0; i < bound; i++) {
494 216930 bit_alloc_bits = alloc_table[j];
495
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 454509 for (ch = 0; ch < s->nb_channels; ch++)
496 237579 bit_alloc[ch][i] = get_bits(&s->gb, bit_alloc_bits);
497 216930 j += 1 << bit_alloc_bits;
498 }
499
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 7323 for (i = bound; i < sblimit; i++) {
500 ✗ bit_alloc_bits = alloc_table[j];
501 ✗ v = get_bits(&s->gb, bit_alloc_bits);
502 ✗ bit_alloc[0][i] = v;
503 ✗ bit_alloc[1][i] = v;
504 ✗ j += 1 << bit_alloc_bits;
505 }
506
507 /* scale codes */
508
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 224253 for (i = 0; i < sblimit; i++) {
509
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510
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 237579 if (bit_alloc[ch][i])
511 165104 scale_code[ch][i] = get_bits(&s->gb, 2);
512 }
513 }
514
515 7323 ret = handle_crc(s, get_bits_count(&s->gb) - 16);
516
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 7323 if (ret < 0)
517 ✗ return ret;
518
519 /* scale factors */
520
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521
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522
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 237579 if (bit_alloc[ch][i]) {
523 165104 sf = scale_factors[ch][i];
524
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 165104 switch (scale_code[ch][i]) {
525 2936 default:
526 case 0:
527 2936 sf[0] = get_bits(&s->gb, 6);
528 2936 sf[1] = get_bits(&s->gb, 6);
529 2936 sf[2] = get_bits(&s->gb, 6);
530 2936 break;
531 154627 case 2:
532 154627 sf[0] = get_bits(&s->gb, 6);
533 154627 sf[1] = sf[0];
534 154627 sf[2] = sf[0];
535 154627 break;
536 2544 case 1:
537 2544 sf[0] = get_bits(&s->gb, 6);
538 2544 sf[2] = get_bits(&s->gb, 6);
539 2544 sf[1] = sf[0];
540 2544 break;
541 4997 case 3:
542 4997 sf[0] = get_bits(&s->gb, 6);
543 4997 sf[2] = get_bits(&s->gb, 6);
544 4997 sf[1] = sf[2];
545 4997 break;
546 }
547 }
548 }
549 }
550
551 /* samples */
552
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 29292 for (k = 0; k < 3; k++) {
553
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 109845 for (l = 0; l < 12; l += 3) {
554 87876 j = 0;
555
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 2691036 for (i = 0; i < bound; i++) {
556 2603160 bit_alloc_bits = alloc_table[j];
557
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 5454108 for (ch = 0; ch < s->nb_channels; ch++) {
558 2850948 b = bit_alloc[ch][i];
559
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 2850948 if (b) {
560 1981248 scale = scale_factors[ch][i][k];
561 1981248 qindex = alloc_table[j+b];
562 1981248 bits = ff_mpa_quant_bits[qindex];
563
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 1981248 if (bits < 0) {
564 int v2;
565 /* 3 values at the same time */
566 302928 v = get_bits(&s->gb, -bits);
567 302928 v2 = ff_division_tabs[qindex][v];
568 302928 steps = ff_mpa_quant_steps[qindex];
569
570 603480 s->sb_samples[ch][k * 12 + l + 0][i] =
571 302928 l2_unscale_group(steps, v2 & 15, scale);
572 603480 s->sb_samples[ch][k * 12 + l + 1][i] =
573 302928 l2_unscale_group(steps, (v2 >> 4) & 15, scale);
574 302928 s->sb_samples[ch][k * 12 + l + 2][i] =
575 302928 l2_unscale_group(steps, v2 >> 8 , scale);
576 } else {
577
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 6713280 for (m = 0; m < 3; m++) {
578 5034960 v = get_bits(&s->gb, bits);
579 5034960 v = l1_unscale(bits - 1, v, scale);
580 5034960 s->sb_samples[ch][k * 12 + l + m][i] = v;
581 }
582 }
583 } else {
584 869700 s->sb_samples[ch][k * 12 + l + 0][i] = 0;
585 869700 s->sb_samples[ch][k * 12 + l + 1][i] = 0;
586 869700 s->sb_samples[ch][k * 12 + l + 2][i] = 0;
587 }
588 }
589 /* next subband in alloc table */
590 2603160 j += 1 << bit_alloc_bits;
591 }
592 /* XXX: find a way to avoid this duplication of code */
593
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 87876 for (i = bound; i < sblimit; i++) {
594 ✗ bit_alloc_bits = alloc_table[j];
595 ✗ b = bit_alloc[0][i];
596 ✗ if (b) {
597 int mant, scale0, scale1;
598 ✗ scale0 = scale_factors[0][i][k];
599 ✗ scale1 = scale_factors[1][i][k];
600 ✗ qindex = alloc_table[j + b];
601 ✗ bits = ff_mpa_quant_bits[qindex];
602 ✗ if (bits < 0) {
603 /* 3 values at the same time */
604 ✗ v = get_bits(&s->gb, -bits);
605 ✗ steps = ff_mpa_quant_steps[qindex];
606 ✗ mant = v % steps;
607 ✗ v = v / steps;
608 ✗ s->sb_samples[0][k * 12 + l + 0][i] =
609 ✗ l2_unscale_group(steps, mant, scale0);
610 ✗ s->sb_samples[1][k * 12 + l + 0][i] =
611 ✗ l2_unscale_group(steps, mant, scale1);
612 ✗ mant = v % steps;
613 ✗ v = v / steps;
614 ✗ s->sb_samples[0][k * 12 + l + 1][i] =
615 ✗ l2_unscale_group(steps, mant, scale0);
616 ✗ s->sb_samples[1][k * 12 + l + 1][i] =
617 ✗ l2_unscale_group(steps, mant, scale1);
618 ✗ s->sb_samples[0][k * 12 + l + 2][i] =
619 ✗ l2_unscale_group(steps, v, scale0);
620 ✗ s->sb_samples[1][k * 12 + l + 2][i] =
621 ✗ l2_unscale_group(steps, v, scale1);
622 } else {
623 ✗ for (m = 0; m < 3; m++) {
624 ✗ mant = get_bits(&s->gb, bits);
625 ✗ s->sb_samples[0][k * 12 + l + m][i] =
626 ✗ l1_unscale(bits - 1, mant, scale0);
627 ✗ s->sb_samples[1][k * 12 + l + m][i] =
628 ✗ l1_unscale(bits - 1, mant, scale1);
629 }
630 }
631 } else {
632 ✗ s->sb_samples[0][k * 12 + l + 0][i] = 0;
633 ✗ s->sb_samples[0][k * 12 + l + 1][i] = 0;
634 ✗ s->sb_samples[0][k * 12 + l + 2][i] = 0;
635 ✗ s->sb_samples[1][k * 12 + l + 0][i] = 0;
636 ✗ s->sb_samples[1][k * 12 + l + 1][i] = 0;
637 ✗ s->sb_samples[1][k * 12 + l + 2][i] = 0;
638 }
639 /* next subband in alloc table */
640 ✗ j += 1 << bit_alloc_bits;
641 }
642 /* fill remaining samples to zero */
643
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 296748 for (i = sblimit; i < SBLIMIT; i++) {
644
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 453732 for (ch = 0; ch < s->nb_channels; ch++) {
645 244860 s->sb_samples[ch][k * 12 + l + 0][i] = 0;
646 244860 s->sb_samples[ch][k * 12 + l + 1][i] = 0;
647 244860 s->sb_samples[ch][k * 12 + l + 2][i] = 0;
648 }
649 }
650 }
651 }
652 7323 return 3 * 12;
653 }
654
655 #define SPLIT(dst,sf,n) \
656 if (n == 3) { \
657 int m = (sf * 171) >> 9; \
658 dst = sf - 3 * m; \
659 sf = m; \
660 } else if (n == 4) { \
661 dst = sf & 3; \
662 sf >>= 2; \
663 } else if (n == 5) { \
664 int m = (sf * 205) >> 10; \
665 dst = sf - 5 * m; \
666 sf = m; \
667 } else if (n == 6) { \
668 int m = (sf * 171) >> 10; \
669 dst = sf - 6 * m; \
670 sf = m; \
671 } else { \
672 dst = 0; \
673 }
674
675 4 static av_always_inline void lsf_sf_expand(int *slen, int sf, int n1, int n2,
676 int n3)
677 {
678
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 4 SPLIT(slen[3], sf, n3)
679
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 4 SPLIT(slen[2], sf, n2)
680
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 4 SPLIT(slen[1], sf, n1)
681 4 slen[0] = sf;
682 4 }
683
684 8138 static void exponents_from_scale_factors(MPADecodeContext *s, GranuleDef *g,
685 int16_t *exponents)
686 {
687 const uint8_t *bstab, *pretab;
688 int len, i, j, k, l, v0, shift, gain, gains[3];
689 int16_t *exp_ptr;
690
691 8138 exp_ptr = exponents;
692 8138 gain = g->global_gain - 210;
693 8138 shift = g->scalefac_scale + 1;
694
695 8138 bstab = ff_band_size_long[s->sample_rate_index];
696 8138 pretab = ff_mpa_pretab[g->preflag];
697
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 180436 for (i = 0; i < g->long_end; i++) {
698 172298 v0 = gain - ((g->scale_factors[i] + pretab[i]) << shift) + 400;
699 172298 len = bstab[i];
700
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 4681118 for (j = len; j > 0; j--)
701 4508820 *exp_ptr++ = v0;
702 }
703
704
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 8138 if (g->short_start < 13) {
705 311 bstab = ff_band_size_short[s->sample_rate_index];
706 311 gains[0] = gain - (g->subblock_gain[0] << 3);
707 311 gains[1] = gain - (g->subblock_gain[1] << 3);
708 311 gains[2] = gain - (g->subblock_gain[2] << 3);
709 311 k = g->long_end;
710
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 4315 for (i = g->short_start; i < 13; i++) {
711 4004 len = bstab[i];
712
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 16016 for (l = 0; l < 3; l++) {
713 12012 v0 = gains[l] - (g->scale_factors[k++] << shift) + 400;
714
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 190680 for (j = len; j > 0; j--)
715 178668 *exp_ptr++ = v0;
716 }
717 }
718 }
719 8138 }
720
721 16851 static void switch_buffer(MPADecodeContext *s, int *pos, int *end_pos,
722 int *end_pos2)
723 {
724
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 16851 if (s->in_gb.buffer && *pos >= s->gb.size_in_bits - s->extrasize * 8) {
725 939 s->gb = s->in_gb;
726 939 s->in_gb.buffer = NULL;
727 939 s->extrasize = 0;
728 av_assert2((get_bits_count(&s->gb) & 7) == 0);
729 939 skip_bits_long(&s->gb, *pos - *end_pos);
730 939 *end_pos2 =
731 939 *end_pos = *end_pos2 + get_bits_count(&s->gb) - *pos;
732 939 *pos = get_bits_count(&s->gb);
733 }
734 16851 }
735
736 /* Following is an optimized code for
737 INTFLOAT v = *src
738 if(get_bits1(&s->gb))
739 v = -v;
740 *dst = v;
741 */
742 #if USE_FLOATS
743 #define READ_FLIP_SIGN(dst,src) \
744 v = AV_RN32A(src) ^ (get_bits1(&s->gb) << 31); \
745 AV_WN32A(dst, v);
746 #else
747 #define READ_FLIP_SIGN(dst,src) \
748 v = -get_bits1(&s->gb); \
749 *(dst) = (*(src) ^ v) - v;
750 #endif
751
752 8138 static int huffman_decode(MPADecodeContext *s, GranuleDef *g,
753 int16_t *exponents, int end_pos2)
754 {
755 int s_index;
756 int i;
757 int last_pos, bits_left;
758 VLC *vlc;
759 8138 int end_pos = FFMIN(end_pos2, s->gb.size_in_bits - s->extrasize * 8);
760
761 /* low frequencies (called big values) */
762 8138 s_index = 0;
763
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 32552 for (i = 0; i < 3; i++) {
764 const VLCElem *vlctab;
765 int j, k, l, linbits;
766 24414 j = g->region_size[i];
767
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 24414 if (j == 0)
768 1345 continue;
769 /* select vlc table */
770 23069 k = g->table_select[i];
771 23069 l = ff_mpa_huff_data[k][0];
772 23069 linbits = ff_mpa_huff_data[k][1];
773
774
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 23069 if (!l) {
775 92 memset(&g->sb_hybrid[s_index], 0, sizeof(*g->sb_hybrid) * 2 * j);
776 92 s_index += 2 * j;
777 92 continue;
778 }
779 22977 vlctab = ff_huff_vlc[l];
780
781 /* read huffcode and compute each couple */
782
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 911329 for (; j > 0; j--) {
783 int exponent, x, y;
784 int v;
785 888352 int pos = get_bits_count(&s->gb);
786
787
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 888352 if (pos >= end_pos){
788 789 switch_buffer(s, &pos, &end_pos, &end_pos2);
789
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 789 if (pos >= end_pos)
790 ✗ break;
791 }
792 888352 y = get_vlc2(&s->gb, vlctab, 7, 3);
793
794
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 888352 if (!y) {
795 216377 g->sb_hybrid[s_index ] =
796 216377 g->sb_hybrid[s_index + 1] = 0;
797 216377 s_index += 2;
798 216377 continue;
799 }
800
801 671975 exponent= exponents[s_index];
802
803 ff_dlog(s->avctx, "region=%d n=%d y=%d exp=%d\n",
804 i, g->region_size[i] - j, y, exponent);
805
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 671975 if (y & 16) {
806 427016 x = y >> 5;
807 427016 y = y & 0x0f;
808
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 427016 if (x < 15) {
809 400996 READ_FLIP_SIGN(g->sb_hybrid + s_index, RENAME(expval_table)[exponent] + x)
810 } else {
811 26020 x += get_bitsz(&s->gb, linbits);
812 26020 v = l3_unscale(x, exponent);
813
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 26020 if (get_bits1(&s->gb))
814 12480 v = -v;
815 26020 g->sb_hybrid[s_index] = v;
816 }
817
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 427016 if (y < 15) {
818 401952 READ_FLIP_SIGN(g->sb_hybrid + s_index + 1, RENAME(expval_table)[exponent] + y)
819 } else {
820 25064 y += get_bitsz(&s->gb, linbits);
821 25064 v = l3_unscale(y, exponent);
822
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 25064 if (get_bits1(&s->gb))
823 11937 v = -v;
824 25064 g->sb_hybrid[s_index + 1] = v;
825 }
826 } else {
827 244959 x = y >> 5;
828 244959 y = y & 0x0f;
829 244959 x += y;
830
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 244959 if (x < 15) {
831
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 239152 READ_FLIP_SIGN(g->sb_hybrid + s_index + !!y, RENAME(expval_table)[exponent] + x)
832 } else {
833 5807 x += get_bitsz(&s->gb, linbits);
834 5807 v = l3_unscale(x, exponent);
835
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 5807 if (get_bits1(&s->gb))
836 2116 v = -v;
837 5807 g->sb_hybrid[s_index+!!y] = v;
838 }
839 244959 g->sb_hybrid[s_index + !y] = 0;
840 }
841 671975 s_index += 2;
842 }
843 }
844
845 /* high frequencies */
846 8138 vlc = &ff_huff_quad_vlc[g->count1table_select];
847 8138 last_pos = 0;
848
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 227243 while (s_index <= 572) {
849 int pos, code;
850 226942 pos = get_bits_count(&s->gb);
851
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 226942 if (pos >= end_pos) {
852
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 7924 if (pos > end_pos2 && last_pos) {
853 /* some encoders generate an incorrect size for this
854 part. We must go back into the data */
855 ✗ s_index -= 4;
856 ✗ skip_bits_long(&s->gb, last_pos - pos);
857 ✗ av_log(s->avctx, AV_LOG_INFO, "overread, skip %d enddists: %d %d\n", last_pos - pos, end_pos-pos, end_pos2-pos);
858 ✗ if(s->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT))
859 ✗ s_index=0;
860 7837 break;
861 }
862 7924 switch_buffer(s, &pos, &end_pos, &end_pos2);
863
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 7924 if (pos >= end_pos)
864 7837 break;
865 }
866 219105 last_pos = pos;
867
868 219105 code = get_vlc2(&s->gb, vlc->table, vlc->bits, 1);
869 ff_dlog(s->avctx, "t=%d code=%d\n", g->count1table_select, code);
870 219105 g->sb_hybrid[s_index + 0] =
871 219105 g->sb_hybrid[s_index + 1] =
872 219105 g->sb_hybrid[s_index + 2] =
873 219105 g->sb_hybrid[s_index + 3] = 0;
874
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 368106 while (code) {
875 static const int idxtab[16] = { 3,3,2,2,1,1,1,1,0,0,0,0,0,0,0,0 };
876 int v;
877 149001 int pos = s_index + idxtab[code];
878 149001 code ^= 8 >> idxtab[code];
879 149001 READ_FLIP_SIGN(g->sb_hybrid + pos, RENAME(exp_table)+exponents[pos])
880 }
881 219105 s_index += 4;
882 }
883 /* skip extension bits */
884 8138 bits_left = end_pos2 - get_bits_count(&s->gb);
885
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 8138 if (bits_left < 0 && (s->err_recognition & (AV_EF_BUFFER|AV_EF_COMPLIANT))) {
886 ✗ av_log(s->avctx, AV_LOG_ERROR, "bits_left=%d\n", bits_left);
887 ✗ s_index=0;
888
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 8138 } else if (bits_left > 0 && (s->err_recognition & (AV_EF_BUFFER|AV_EF_AGGRESSIVE))) {
889 ✗ av_log(s->avctx, AV_LOG_ERROR, "bits_left=%d\n", bits_left);
890 ✗ s_index = 0;
891 }
892 8138 memset(&g->sb_hybrid[s_index], 0, sizeof(*g->sb_hybrid) * (576 - s_index));
893 8138 skip_bits_long(&s->gb, bits_left);
894
895 8138 i = get_bits_count(&s->gb);
896 8138 switch_buffer(s, &i, &end_pos, &end_pos2);
897
898 8138 return 0;
899 }
900
901 /* Reorder short blocks from bitstream order to interleaved order. It
902 would be faster to do it in parsing, but the code would be far more
903 complicated */
904 8138 static void reorder_block(MPADecodeContext *s, GranuleDef *g)
905 {
906 int i, j, len;
907 INTFLOAT *ptr, *dst, *ptr1;
908 INTFLOAT tmp[576];
909
910
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 8138 if (g->block_type != 2)
911 7827 return;
912
913
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 311 if (g->switch_point) {
914
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 13 if (s->sample_rate_index != 8)
915 13 ptr = g->sb_hybrid + 36;
916 else
917 ✗ ptr = g->sb_hybrid + 72;
918 } else {
919 298 ptr = g->sb_hybrid;
920 }
921
922
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 4315 for (i = g->short_start; i < 13; i++) {
923 4004 len = ff_band_size_short[s->sample_rate_index][i];
924 4004 ptr1 = ptr;
925 4004 dst = tmp;
926
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 63560 for (j = len; j > 0; j--) {
927 59556 *dst++ = ptr[0*len];
928 59556 *dst++ = ptr[1*len];
929 59556 *dst++ = ptr[2*len];
930 59556 ptr++;
931 }
932 4004 ptr += 2 * len;
933 4004 memcpy(ptr1, tmp, len * 3 * sizeof(*ptr1));
934 }
935 }
936
937 #define ISQRT2 FIXR(0.70710678118654752440)
938
939 2455 static void compute_stereo(MPADecodeContext *s, GranuleDef *g0, GranuleDef *g1)
940 {
941 int i, j, k, l;
942 int sf_max, sf, len, non_zero_found;
943 INTFLOAT *tab0, *tab1, v1, v2;
944 const INTFLOAT (*is_tab)[16];
945 SUINTFLOAT tmp0, tmp1;
946 int non_zero_found_short[3];
947
948 /* intensity stereo */
949
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 2455 if (s->mode_ext & MODE_EXT_I_STEREO) {
950
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 1 if (!s->lsf) {
951 ✗ is_tab = is_table;
952 ✗ sf_max = 7;
953 } else {
954 1 is_tab = is_table_lsf[g1->scalefac_compress & 1];
955 1 sf_max = 16;
956 }
957
958 1 tab0 = g0->sb_hybrid + 576;
959 1 tab1 = g1->sb_hybrid + 576;
960
961 1 non_zero_found_short[0] = 0;
962 1 non_zero_found_short[1] = 0;
963 1 non_zero_found_short[2] = 0;
964 1 k = (13 - g1->short_start) * 3 + g1->long_end - 3;
965
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 1 for (i = 12; i >= g1->short_start; i--) {
966 /* for last band, use previous scale factor */
967 ✗ if (i != 11)
968 ✗ k -= 3;
969 ✗ len = ff_band_size_short[s->sample_rate_index][i];
970 ✗ for (l = 2; l >= 0; l--) {
971 ✗ tab0 -= len;
972 ✗ tab1 -= len;
973 ✗ if (!non_zero_found_short[l]) {
974 /* test if non zero band. if so, stop doing i-stereo */
975 ✗ for (j = 0; j < len; j++) {
976 ✗ if (tab1[j] != 0) {
977 ✗ non_zero_found_short[l] = 1;
978 ✗ goto found1;
979 }
980 }
981 ✗ sf = g1->scale_factors[k + l];
982 ✗ if (sf >= sf_max)
983 ✗ goto found1;
984
985 ✗ v1 = is_tab[0][sf];
986 ✗ v2 = is_tab[1][sf];
987 ✗ for (j = 0; j < len; j++) {
988 ✗ tmp0 = tab0[j];
989 ✗ tab0[j] = MULLx(tmp0, v1, FRAC_BITS);
990 ✗ tab1[j] = MULLx(tmp0, v2, FRAC_BITS);
991 }
992 } else {
993 ✗ found1:
994 ✗ if (s->mode_ext & MODE_EXT_MS_STEREO) {
995 /* lower part of the spectrum : do ms stereo
996 if enabled */
997 ✗ for (j = 0; j < len; j++) {
998 ✗ tmp0 = tab0[j];
999 ✗ tmp1 = tab1[j];
1000 ✗ tab0[j] = MULLx(tmp0 + tmp1, ISQRT2, FRAC_BITS);
1001 ✗ tab1[j] = MULLx(tmp0 - tmp1, ISQRT2, FRAC_BITS);
1002 }
1003 }
1004 }
1005 }
1006 }
1007
1008 1 non_zero_found = non_zero_found_short[0] |
1009 1 non_zero_found_short[1] |
1010 1 non_zero_found_short[2];
1011
1012
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 23 for (i = g1->long_end - 1;i >= 0;i--) {
1013 22 len = ff_band_size_long[s->sample_rate_index][i];
1014 22 tab0 -= len;
1015 22 tab1 -= len;
1016 /* test if non zero band. if so, stop doing i-stereo */
1017
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 22 if (!non_zero_found) {
1018
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 598 for (j = 0; j < len; j++) {
1019
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 576 if (tab1[j] != 0) {
1020 ✗ non_zero_found = 1;
1021 ✗ goto found2;
1022 }
1023 }
1024 /* for last band, use previous scale factor */
1025
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 22 k = (i == 21) ? 20 : i;
1026 22 sf = g1->scale_factors[k];
1027
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✓ Branch 1 taken 22 times.
 22 if (sf >= sf_max)
1028 ✗ goto found2;
1029 22 v1 = is_tab[0][sf];
1030 22 v2 = is_tab[1][sf];
1031
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 598 for (j = 0; j < len; j++) {
1032 576 tmp0 = tab0[j];
1033 576 tab0[j] = MULLx(tmp0, v1, FRAC_BITS);
1034 576 tab1[j] = MULLx(tmp0, v2, FRAC_BITS);
1035 }
1036 } else {
1037 ✗ found2:
1038 ✗ if (s->mode_ext & MODE_EXT_MS_STEREO) {
1039 /* lower part of the spectrum : do ms stereo
1040 if enabled */
1041 ✗ for (j = 0; j < len; j++) {
1042 ✗ tmp0 = tab0[j];
1043 ✗ tmp1 = tab1[j];
1044 ✗ tab0[j] = MULLx(tmp0 + tmp1, ISQRT2, FRAC_BITS);
1045 ✗ tab1[j] = MULLx(tmp0 - tmp1, ISQRT2, FRAC_BITS);
1046 }
1047 }
1048 }
1049 }
1050
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 2454 } else if (s->mode_ext & MODE_EXT_MS_STEREO) {
1051 /* ms stereo ONLY */
1052 /* NOTE: the 1/sqrt(2) normalization factor is included in the
1053 global gain */
1054 #if USE_FLOATS
1055 58 s->butterflies_float(g0->sb_hybrid, g1->sb_hybrid, 576);
1056 #else
1057 2176 tab0 = g0->sb_hybrid;
1058 2176 tab1 = g1->sb_hybrid;
1059
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 1255552 for (i = 0; i < 576; i++) {
1060 1253376 tmp0 = tab0[i];
1061 1253376 tmp1 = tab1[i];
1062 1253376 tab0[i] = tmp0 + tmp1;
1063 1253376 tab1[i] = tmp0 - tmp1;
1064 }
1065 #endif
1066 }
1067 2455 }
1068
1069 #if USE_FLOATS
1070 #if HAVE_MIPSFPU
1071 # include "mips/compute_antialias_float.h"
1072 #endif /* HAVE_MIPSFPU */
1073 #else
1074 #if HAVE_MIPSDSP
1075 # include "mips/compute_antialias_fixed.h"
1076 #endif /* HAVE_MIPSDSP */
1077 #endif /* USE_FLOATS */
1078
1079 #ifndef compute_antialias
1080 #if USE_FLOATS
1081 #define AA(j) do { \
1082 float tmp0 = ptr[-1-j]; \
1083 float tmp1 = ptr[ j]; \
1084 ptr[-1-j] = tmp0 * csa_table[j][0] - tmp1 * csa_table[j][1]; \
1085 ptr[ j] = tmp0 * csa_table[j][1] + tmp1 * csa_table[j][0]; \
1086 } while (0)
1087 #else
1088 #define AA(j) do { \
1089 SUINT tmp0 = ptr[-1-j]; \
1090 SUINT tmp1 = ptr[ j]; \
1091 SUINT tmp2 = MULH(tmp0 + tmp1, csa_table[j][0]); \
1092 ptr[-1-j] = 4 * (tmp2 - MULH(tmp1, csa_table[j][2])); \
1093 ptr[ j] = 4 * (tmp2 + MULH(tmp0, csa_table[j][3])); \
1094 } while (0)
1095 #endif
1096
1097 8138 static void compute_antialias(MPADecodeContext *s, GranuleDef *g)
1098 {
1099 INTFLOAT *ptr;
1100 int n, i;
1101
1102 /* we antialias only "long" bands */
1103
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 8138 if (g->block_type == 2) {
1104
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✓ Branch 1 taken 13 times.
 311 if (!g->switch_point)
1105 298 return;
1106 /* XXX: check this for 8000Hz case */
1107 13 n = 1;
1108 } else {
1109 7827 n = SBLIMIT - 1;
1110 }
1111
1112 7840 ptr = g->sb_hybrid + 18;
1113
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 250490 for (i = n; i > 0; i--) {
1114 242650 AA(0);
1115 242650 AA(1);
1116 242650 AA(2);
1117 242650 AA(3);
1118 242650 AA(4);
1119 242650 AA(5);
1120 242650 AA(6);
1121 242650 AA(7);
1122
1123 242650 ptr += 18;
1124 }
1125 }
1126 #endif /* compute_antialias */
1127
1128 8146 static void compute_imdct(MPADecodeContext *s, GranuleDef *g,
1129 INTFLOAT *sb_samples, INTFLOAT *mdct_buf)
1130 {
1131 INTFLOAT *win, *out_ptr, *ptr, *buf, *ptr1;
1132 INTFLOAT out2[12];
1133 int i, j, mdct_long_end, sblimit;
1134
1135 /* find last non zero block */
1136 8146 ptr = g->sb_hybrid + 576;
1137 8146 ptr1 = g->sb_hybrid + 2 * 18;
1138
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 313889 while (ptr >= ptr1) {
1139 int32_t *p;
1140 313691 ptr -= 6;
1141 313691 p = (int32_t*)ptr;
1142
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✓ Branch 1 taken 305743 times.
 313691 if (p[0] | p[1] | p[2] | p[3] | p[4] | p[5])
1143 7948 break;
1144 }
1145 8146 sblimit = ((ptr - g->sb_hybrid) / 18) + 1;
1146
1147
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 8146 if (g->block_type == 2) {
1148 /* XXX: check for 8000 Hz */
1149
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 313 if (g->switch_point)
1150 13 mdct_long_end = 2;
1151 else
1152 300 mdct_long_end = 0;
1153 } else {
1154 7833 mdct_long_end = sblimit;
1155 }
1156
1157 8146 s->mpadsp.RENAME(imdct36_blocks)(sb_samples, mdct_buf, g->sb_hybrid,
1158 8146 mdct_long_end, g->switch_point,
1159 8146 g->block_type);
1160
1161 8146 buf = mdct_buf + 4*18*(mdct_long_end >> 2) + (mdct_long_end & 3);
1162 8146 ptr = g->sb_hybrid + 18 * mdct_long_end;
1163
1164
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 14764 for (j = mdct_long_end; j < sblimit; j++) {
1165 /* select frequency inversion */
1166 6618 win = RENAME(ff_mdct_win)[2 + (4 & -(j & 1))];
1167 6618 out_ptr = sb_samples + j;
1168
1169
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 46326 for (i = 0; i < 6; i++) {
1170 39708 *out_ptr = buf[4*i];
1171 39708 out_ptr += SBLIMIT;
1172 }
1173 6618 imdct12(out2, ptr + 0);
1174
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 46326 for (i = 0; i < 6; i++) {
1175 39708 *out_ptr = MULH3(out2[i ], win[i ], 1) + buf[4*(i + 6*1)];
1176 39708 buf[4*(i + 6*2)] = MULH3(out2[i + 6], win[i + 6], 1);
1177 39708 out_ptr += SBLIMIT;
1178 }
1179 6618 imdct12(out2, ptr + 1);
1180
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 46326 for (i = 0; i < 6; i++) {
1181 39708 *out_ptr = MULH3(out2[i ], win[i ], 1) + buf[4*(i + 6*2)];
1182 39708 buf[4*(i + 6*0)] = MULH3(out2[i + 6], win[i + 6], 1);
1183 39708 out_ptr += SBLIMIT;
1184 }
1185 6618 imdct12(out2, ptr + 2);
1186
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 46326 for (i = 0; i < 6; i++) {
1187 39708 buf[4*(i + 6*0)] = MULH3(out2[i ], win[i ], 1) + buf[4*(i + 6*0)];
1188 39708 buf[4*(i + 6*1)] = MULH3(out2[i + 6], win[i + 6], 1);
1189 39708 buf[4*(i + 6*2)] = 0;
1190 }
1191 6618 ptr += 18;
1192
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 6618 buf += (j&3) != 3 ? 1 : (4*18-3);
1193 }
1194 /* zero bands */
1195
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 106315 for (j = sblimit; j < SBLIMIT; j++) {
1196 /* overlap */
1197 98169 out_ptr = sb_samples + j;
1198
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 1865211 for (i = 0; i < 18; i++) {
1199 1767042 *out_ptr = buf[4*i];
1200 1767042 buf[4*i] = 0;
1201 1767042 out_ptr += SBLIMIT;
1202 }
1203
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 98169 buf += (j&3) != 3 ? 1 : (4*18-3);
1204 }
1205 8146 }
1206
1207 /* main layer3 decoding function */
1208 2814 static int mp_decode_layer3(MPADecodeContext *s)
1209 {
1210 int nb_granules, main_data_begin;
1211 int gr, ch, blocksplit_flag, i, j, k, n, bits_pos;
1212 GranuleDef *g;
1213 int16_t exponents[576]; //FIXME try INTFLOAT
1214 int ret;
1215
1216 /* read side info */
1217
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 2814 if (s->lsf) {
1218
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 3 ret = handle_crc(s, ((s->nb_channels == 1) ? 8*9 : 8*17));
1219 3 main_data_begin = get_bits(&s->gb, 8);
1220 3 skip_bits(&s->gb, s->nb_channels);
1221 3 nb_granules = 1;
1222 } else {
1223
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✓ Branch 1 taken 1260 times.
 2811 ret = handle_crc(s, ((s->nb_channels == 1) ? 8*17 : 8*32));
1224 2811 main_data_begin = get_bits(&s->gb, 9);
1225
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 2811 if (s->nb_channels == 2)
1226 1260 skip_bits(&s->gb, 3);
1227 else
1228 1551 skip_bits(&s->gb, 5);
1229 2811 nb_granules = 2;
1230
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✓ Branch 0 taken 4071 times.
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 6882 for (ch = 0; ch < s->nb_channels; ch++) {
1231 4071 s->granules[ch][0].scfsi = 0;/* all scale factors are transmitted */
1232 4071 s->granules[ch][1].scfsi = get_bits(&s->gb, 4);
1233 }
1234 }
1235
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 2814 if (ret < 0)
1236 ✗ return ret;
1237
1238
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 8439 for (gr = 0; gr < nb_granules; gr++) {
1239
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 13771 for (ch = 0; ch < s->nb_channels; ch++) {
1240 ff_dlog(s->avctx, "gr=%d ch=%d: side_info\n", gr, ch);
1241 8146 g = &s->granules[ch][gr];
1242 8146 g->part2_3_length = get_bits(&s->gb, 12);
1243 8146 g->big_values = get_bits(&s->gb, 9);
1244
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 8146 if (g->big_values > 288) {
1245 ✗ av_log(s->avctx, AV_LOG_ERROR, "big_values too big\n");
1246 ✗ return AVERROR_INVALIDDATA;
1247 }
1248
1249 8146 g->global_gain = get_bits(&s->gb, 8);
1250 /* if MS stereo only is selected, we precompute the
1251 1/sqrt(2) renormalization factor */
1252
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 8146 if ((s->mode_ext & (MODE_EXT_MS_STEREO | MODE_EXT_I_STEREO)) ==
1253 MODE_EXT_MS_STEREO)
1254 4468 g->global_gain -= 2;
1255
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 8146 if (s->lsf)
1256 4 g->scalefac_compress = get_bits(&s->gb, 9);
1257 else
1258 8142 g->scalefac_compress = get_bits(&s->gb, 4);
1259 8146 blocksplit_flag = get_bits1(&s->gb);
1260
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✓ Branch 1 taken 7285 times.
 8146 if (blocksplit_flag) {
1261 861 g->block_type = get_bits(&s->gb, 2);
1262
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✓ Branch 1 taken 861 times.
 861 if (g->block_type == 0) {
1263 ✗ av_log(s->avctx, AV_LOG_ERROR, "invalid block type\n");
1264 ✗ return AVERROR_INVALIDDATA;
1265 }
1266 861 g->switch_point = get_bits1(&s->gb);
1267
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 2583 for (i = 0; i < 2; i++)
1268 1722 g->table_select[i] = get_bits(&s->gb, 5);
1269
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 3444 for (i = 0; i < 3; i++)
1270 2583 g->subblock_gain[i] = get_bits(&s->gb, 3);
1271 861 init_short_region(s, g);
1272 } else {
1273 int region_address1, region_address2;
1274 7285 g->block_type = 0;
1275 7285 g->switch_point = 0;
1276
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 29140 for (i = 0; i < 3; i++)
1277 21855 g->table_select[i] = get_bits(&s->gb, 5);
1278 /* compute huffman coded region sizes */
1279 7285 region_address1 = get_bits(&s->gb, 4);
1280 7285 region_address2 = get_bits(&s->gb, 3);
1281 ff_dlog(s->avctx, "region1=%d region2=%d\n",
1282 region_address1, region_address2);
1283 7285 init_long_region(s, g, region_address1, region_address2);
1284 }
1285 8146 region_offset2size(g);
1286 8146 compute_band_indexes(s, g);
1287
1288 8146 g->preflag = 0;
1289
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 8146 if (!s->lsf)
1290 8142 g->preflag = get_bits1(&s->gb);
1291 8146 g->scalefac_scale = get_bits1(&s->gb);
1292 8146 g->count1table_select = get_bits1(&s->gb);
1293 ff_dlog(s->avctx, "block_type=%d switch_point=%d\n",
1294 g->block_type, g->switch_point);
1295 }
1296 }
1297
1298
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✗ Branch 1 not taken.
 2814 if (!s->adu_mode) {
1299 int skip;
1300 2814 const uint8_t *ptr = s->gb.buffer + (get_bits_count(&s->gb) >> 3);
1301 2814 s->extrasize = av_clip((get_bits_left(&s->gb) >> 3) - s->extrasize, 0,
1302 2814 FFMAX(0, LAST_BUF_SIZE - s->last_buf_size));
1303 av_assert1((get_bits_count(&s->gb) & 7) == 0);
1304 /* now we get bits from the main_data_begin offset */
1305 ff_dlog(s->avctx, "seekback:%d, lastbuf:%d\n",
1306 main_data_begin, s->last_buf_size);
1307
1308 2814 memcpy(s->last_buf + s->last_buf_size, ptr, s->extrasize);
1309 2814 s->in_gb = s->gb;
1310 2814 init_get_bits(&s->gb, s->last_buf, (s->last_buf_size + s->extrasize) * 8);
1311 2814 s->last_buf_size <<= 3;
1312
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 2822 for (gr = 0; gr < nb_granules && (s->last_buf_size >> 3) < main_data_begin; gr++) {
1313
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 16 for (ch = 0; ch < s->nb_channels; ch++) {
1314 8 g = &s->granules[ch][gr];
1315 8 s->last_buf_size += g->part2_3_length;
1316 8 memset(g->sb_hybrid, 0, sizeof(g->sb_hybrid));
1317 8 compute_imdct(s, g, &s->sb_samples[ch][18 * gr][0], s->mdct_buf[ch]);
1318 }
1319 }
1320 2814 skip = s->last_buf_size - 8 * main_data_begin;
1321
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✓ Branch 2 taken 156 times.
✗ Branch 3 not taken.
 2814 if (skip >= s->gb.size_in_bits - s->extrasize * 8 && s->in_gb.buffer) {
1322 156 skip_bits_long(&s->in_gb, skip - s->gb.size_in_bits + s->extrasize * 8);
1323 156 s->gb = s->in_gb;
1324 156 s->in_gb.buffer = NULL;
1325 156 s->extrasize = 0;
1326 } else {
1327 2658 skip_bits_long(&s->gb, skip);
1328 }
1329 } else {
1330 ✗ gr = 0;
1331 ✗ s->extrasize = 0;
1332 }
1333
1334
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 8431 for (; gr < nb_granules; gr++) {
1335
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✓ Branch 1 taken 5617 times.
 13755 for (ch = 0; ch < s->nb_channels; ch++) {
1336 8138 g = &s->granules[ch][gr];
1337 8138 bits_pos = get_bits_count(&s->gb);
1338
1339
2/2
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✓ Branch 1 taken 4 times.
 8138 if (!s->lsf) {
1340 uint8_t *sc;
1341 int slen, slen1, slen2;
1342
1343 /* MPEG-1 scale factors */
1344 8134 slen1 = ff_slen_table[0][g->scalefac_compress];
1345 8134 slen2 = ff_slen_table[1][g->scalefac_compress];
1346 ff_dlog(s->avctx, "slen1=%d slen2=%d\n", slen1, slen2);
1347
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 8134 if (g->block_type == 2) {
1348
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 311 n = g->switch_point ? 17 : 18;
1349 311 j = 0;
1350
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 311 if (slen1) {
1351
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✓ Branch 1 taken 45 times.
 851 for (i = 0; i < n; i++)
1352 806 g->scale_factors[j++] = get_bits(&s->gb, slen1);
1353 } else {
1354
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 5045 for (i = 0; i < n; i++)
1355 4779 g->scale_factors[j++] = 0;
1356 }
1357
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 311 if (slen2) {
1358
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 4921 for (i = 0; i < 18; i++)
1359 4662 g->scale_factors[j++] = get_bits(&s->gb, slen2);
1360
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 1036 for (i = 0; i < 3; i++)
1361 777 g->scale_factors[j++] = 0;
1362 } else {
1363
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✓ Branch 1 taken 52 times.
 1144 for (i = 0; i < 21; i++)
1364 1092 g->scale_factors[j++] = 0;
1365 }
1366 } else {
1367 7823 sc = s->granules[ch][0].scale_factors;
1368 7823 j = 0;
1369
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 39115 for (k = 0; k < 4; k++) {
1370
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✓ Branch 1 taken 23469 times.
 31292 n = k == 0 ? 6 : 5;
1371
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✓ Branch 1 taken 4370 times.
 31292 if ((g->scfsi & (0x8 >> k)) == 0) {
1372
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✓ Branch 1 taken 14159 times.
 26922 slen = (k < 2) ? slen1 : slen2;
1373
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 26922 if (slen) {
1374
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 88978 for (i = 0; i < n; i++)
1375 74592 g->scale_factors[j++] = get_bits(&s->gb, slen);
1376 } else {
1377
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 78962 for (i = 0; i < n; i++)
1378 66426 g->scale_factors[j++] = 0;
1379 }
1380 } else {
1381 /* simply copy from last granule */
1382
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 27635 for (i = 0; i < n; i++) {
1383 23265 g->scale_factors[j] = sc[j];
1384 23265 j++;
1385 }
1386 }
1387 }
1388 7823 g->scale_factors[j++] = 0;
1389 }
1390 } else {
1391 int tindex, tindex2, slen[4], sl, sf;
1392
1393 /* LSF scale factors */
1394
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 4 if (g->block_type == 2)
1395 ✗ tindex = g->switch_point ? 2 : 1;
1396 else
1397 4 tindex = 0;
1398
1399 4 sf = g->scalefac_compress;
1400
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 4 if ((s->mode_ext & MODE_EXT_I_STEREO) && ch == 1) {
1401 /* intensity stereo case */
1402 1 sf >>= 1;
1403
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 1 if (sf < 180) {
1404 1 lsf_sf_expand(slen, sf, 6, 6, 0);
1405 1 tindex2 = 3;
1406 ✗ } else if (sf < 244) {
1407 ✗ lsf_sf_expand(slen, sf - 180, 4, 4, 0);
1408 ✗ tindex2 = 4;
1409 } else {
1410 ✗ lsf_sf_expand(slen, sf - 244, 3, 0, 0);
1411 ✗ tindex2 = 5;
1412 }
1413 } else {
1414 /* normal case */
1415
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 3 if (sf < 400) {
1416 1 lsf_sf_expand(slen, sf, 5, 4, 4);
1417 1 tindex2 = 0;
1418
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 2 } else if (sf < 500) {
1419 2 lsf_sf_expand(slen, sf - 400, 5, 4, 0);
1420 2 tindex2 = 1;
1421 } else {
1422 ✗ lsf_sf_expand(slen, sf - 500, 3, 0, 0);
1423 ✗ tindex2 = 2;
1424 ✗ g->preflag = 1;
1425 }
1426 }
1427
1428 4 j = 0;
1429
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 20 for (k = 0; k < 4; k++) {
1430 16 n = ff_lsf_nsf_table[tindex2][tindex][k];
1431 16 sl = slen[k];
1432
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 16 if (sl) {
1433
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 45 for (i = 0; i < n; i++)
1434 39 g->scale_factors[j++] = get_bits(&s->gb, sl);
1435 } else {
1436
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 55 for (i = 0; i < n; i++)
1437 45 g->scale_factors[j++] = 0;
1438 }
1439 }
1440 /* XXX: should compute exact size */
1441
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 80 for (; j < 40; j++)
1442 76 g->scale_factors[j] = 0;
1443 }
1444
1445 8138 exponents_from_scale_factors(s, g, exponents);
1446
1447 /* read Huffman coded residue */
1448 8138 huffman_decode(s, g, exponents, bits_pos + g->part2_3_length);
1449 } /* ch */
1450
1451
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 5617 if (s->mode == MPA_JSTEREO)
1452 2455 compute_stereo(s, &s->granules[0][gr], &s->granules[1][gr]);
1453
1454
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 13755 for (ch = 0; ch < s->nb_channels; ch++) {
1455 8138 g = &s->granules[ch][gr];
1456
1457 8138 reorder_block(s, g);
1458 8138 compute_antialias(s, g);
1459 8138 compute_imdct(s, g, &s->sb_samples[ch][18 * gr][0], s->mdct_buf[ch]);
1460 }
1461 } /* gr */
1462
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 2814 if (get_bits_count(&s->gb) < 0)
1463 ✗ skip_bits_long(&s->gb, -get_bits_count(&s->gb));
1464 2814 return nb_granules * 18;
1465 }
1466
1467 10137 static int mp_decode_frame(MPADecodeContext *s, OUT_INT **samples,
1468 const uint8_t *buf, int buf_size)
1469 {
1470 int i, nb_frames, ch, ret;
1471 OUT_INT *samples_ptr;
1472
1473 10137 init_get_bits(&s->gb, buf + HEADER_SIZE, (buf_size - HEADER_SIZE) * 8);
1474
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 10137 if (s->error_protection)
1475 206 s->crc = get_bits(&s->gb, 16);
1476
1477
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 10137 switch(s->layer) {
1478 ✗ case 1:
1479 ✗ s->avctx->frame_size = 384;
1480 ✗ nb_frames = mp_decode_layer1(s);
1481 ✗ break;
1482 7323 case 2:
1483 7323 s->avctx->frame_size = 1152;
1484 7323 nb_frames = mp_decode_layer2(s);
1485 7323 break;
1486 2814 case 3:
1487
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 2814 s->avctx->frame_size = s->lsf ? 576 : 1152;
1488 2814 default:
1489 2814 nb_frames = mp_decode_layer3(s);
1490
1491 2814 s->last_buf_size=0;
1492
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 2814 if (s->in_gb.buffer) {
1493 1719 align_get_bits(&s->gb);
1494 1719 i = (get_bits_left(&s->gb) >> 3) - s->extrasize;
1495
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 1719 if (i >= 0 && i <= BACKSTEP_SIZE) {
1496 1719 memmove(s->last_buf, s->gb.buffer + (get_bits_count(&s->gb) >> 3), i);
1497 1719 s->last_buf_size=i;
1498 } else
1499 ✗ av_log(s->avctx, AV_LOG_ERROR, "invalid old backstep %d\n", i);
1500 1719 s->gb = s->in_gb;
1501 1719 s->in_gb.buffer = NULL;
1502 1719 s->extrasize = 0;
1503 }
1504
1505 2814 align_get_bits(&s->gb);
1506 av_assert1((get_bits_count(&s->gb) & 7) == 0);
1507 2814 i = (get_bits_left(&s->gb) >> 3) - s->extrasize;
1508
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 2814 if (i < 0 || i > BACKSTEP_SIZE || nb_frames < 0) {
1509
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 230 if (i < 0)
1510 ✗ av_log(s->avctx, AV_LOG_ERROR, "invalid new backstep %d\n", i);
1511 230 i = FFMIN(BACKSTEP_SIZE, buf_size - HEADER_SIZE);
1512 }
1513 av_assert1(i <= buf_size - HEADER_SIZE && i >= 0);
1514 2814 memcpy(s->last_buf + s->last_buf_size, s->gb.buffer + buf_size - HEADER_SIZE - i, i);
1515 2814 s->last_buf_size += i;
1516 }
1517
1518
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 10137 if(nb_frames < 0)
1519 ✗ return nb_frames;
1520
1521 /* get output buffer */
1522
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 10137 if (!samples) {
1523
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 10137 av_assert0(s->frame);
1524 10137 s->frame->nb_samples = s->avctx->frame_size;
1525
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 10137 if ((ret = ff_get_buffer(s->avctx, s->frame, 0)) < 0)
1526 ✗ return ret;
1527 10137 samples = (OUT_INT **)s->frame->extended_data;
1528 }
1529
1530 /* apply the synthesis filter */
1531
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 22274 for (ch = 0; ch < s->nb_channels; ch++) {
1532 int sample_stride;
1533
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 12137 if (s->avctx->sample_fmt == OUT_FMT_P) {
1534 12137 samples_ptr = samples[ch];
1535 12137 sample_stride = 1;
1536 } else {
1537 ✗ samples_ptr = samples[0] + ch;
1538 ✗ sample_stride = s->nb_channels;
1539 }
1540
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 448997 for (i = 0; i < nb_frames; i++) {
1541 436860 RENAME(ff_mpa_synth_filter)(&s->mpadsp, s->synth_buf[ch],
1542 &(s->synth_buf_offset[ch]),
1543 RENAME(ff_mpa_synth_window),
1544 &s->dither_state, samples_ptr,
1545 436860 sample_stride, s->sb_samples[ch][i]);
1546 436860 samples_ptr += 32 * sample_stride;
1547 }
1548 }
1549
1550 10137 return nb_frames * 32 * sizeof(OUT_INT) * s->nb_channels;
1551 }
1552
1553 10140 static int decode_frame(AVCodecContext *avctx, AVFrame *frame,
1554 int *got_frame_ptr, AVPacket *avpkt)
1555 {
1556 10140 const uint8_t *buf = avpkt->data;
1557 10140 int buf_size = avpkt->size;
1558 10140 MPADecodeContext *s = avctx->priv_data;
1559 uint32_t header;
1560 int ret;
1561
1562 10140 int skipped = 0;
1563
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 10140 while(buf_size && !*buf){
1564 ✗ buf++;
1565 ✗ buf_size--;
1566 ✗ skipped++;
1567 }
1568
1569
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 10140 if (buf_size < HEADER_SIZE)
1570 ✗ return AVERROR_INVALIDDATA;
1571
1572 10140 header = AV_RB32(buf);
1573
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 10140 if (header >> 8 == AV_RB32("TAG") >> 8) {
1574 ✗ av_log(avctx, AV_LOG_DEBUG, "discarding ID3 tag\n");
1575 ✗ return buf_size + skipped;
1576 }
1577 10140 ret = avpriv_mpegaudio_decode_header((MPADecodeHeader *)s, header);
1578
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 10140 if (ret < 0) {
1579 3 av_log(avctx, AV_LOG_ERROR, "Header missing\n");
1580 3 return AVERROR_INVALIDDATA;
1581
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 10137 } else if (ret == 1) {
1582 /* free format: prepare to compute frame size */
1583 ✗ s->frame_size = -1;
1584 ✗ return AVERROR_INVALIDDATA;
1585 }
1586 /* update codec info */
1587 10137 av_channel_layout_uninit(&avctx->ch_layout);
1588
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 10137 avctx->ch_layout = s->nb_channels == 1 ? (AVChannelLayout)AV_CHANNEL_LAYOUT_MONO :
1589 (AVChannelLayout)AV_CHANNEL_LAYOUT_STEREO;
1590
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 10137 if (!avctx->bit_rate)
1591 7 avctx->bit_rate = s->bit_rate;
1592
1593
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 10137 if (s->frame_size <= 0) {
1594 ✗ av_log(avctx, AV_LOG_ERROR, "incomplete frame\n");
1595 ✗ return AVERROR_INVALIDDATA;
1596
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 10137 } else if (s->frame_size < buf_size) {
1597 1 av_log(avctx, AV_LOG_DEBUG, "incorrect frame size - multiple frames in buffer?\n");
1598 1 buf_size= s->frame_size;
1599 }
1600
1601 10137 s->frame = frame;
1602
1603 10137 ret = mp_decode_frame(s, NULL, buf, buf_size);
1604
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 10137 if (ret >= 0) {
1605 10137 s->frame->nb_samples = avctx->frame_size;
1606 10137 *got_frame_ptr = 1;
1607 10137 avctx->sample_rate = s->sample_rate;
1608 //FIXME maybe move the other codec info stuff from above here too
1609 } else {
1610 ✗ av_log(avctx, AV_LOG_ERROR, "Error while decoding MPEG audio frame.\n");
1611 /* Only return an error if the bad frame makes up the whole packet or
1612 * the error is related to buffer management.
1613 * If there is more data in the packet, just consume the bad frame
1614 * instead of returning an error, which would discard the whole
1615 * packet. */
1616 ✗ *got_frame_ptr = 0;
1617 ✗ if (buf_size == avpkt->size || ret != AVERROR_INVALIDDATA)
1618 ✗ return ret;
1619 }
1620 10137 s->frame_size = 0;
1621 10137 return buf_size + skipped;
1622 }
1623
1624 1 static void mp_flush(MPADecodeContext *ctx)
1625 {
1626 1 memset(ctx->synth_buf, 0, sizeof(ctx->synth_buf));
1627 1 memset(ctx->mdct_buf, 0, sizeof(ctx->mdct_buf));
1628 1 ctx->last_buf_size = 0;
1629 1 ctx->dither_state = 0;
1630 1 }
1631
1632 1 static void flush(AVCodecContext *avctx)
1633 {
1634 1 mp_flush(avctx->priv_data);
1635 1 }
1636
1637 #if CONFIG_MP3ADU_DECODER || CONFIG_MP3ADUFLOAT_DECODER
1638 ✗ static int decode_frame_adu(AVCodecContext *avctx, AVFrame *frame,
1639 int *got_frame_ptr, AVPacket *avpkt)
1640 {
1641 ✗ const uint8_t *buf = avpkt->data;
1642 ✗ int buf_size = avpkt->size;
1643 ✗ MPADecodeContext *s = avctx->priv_data;
1644 uint32_t header;
1645 int len, ret;
1646
1647 ✗ len = buf_size;
1648
1649 // Discard too short frames
1650 ✗ if (buf_size < HEADER_SIZE) {
1651 ✗ av_log(avctx, AV_LOG_ERROR, "Packet is too small\n");
1652 ✗ return AVERROR_INVALIDDATA;
1653 }
1654
1655
1656 ✗ if (len > MPA_MAX_CODED_FRAME_SIZE)
1657 ✗ len = MPA_MAX_CODED_FRAME_SIZE;
1658
1659 // Get header and restore sync word
1660 ✗ header = AV_RB32(buf) | 0xffe00000;
1661
1662 ✗ ret = avpriv_mpegaudio_decode_header((MPADecodeHeader *)s, header);
1663 ✗ if (ret < 0) {
1664 ✗ av_log(avctx, AV_LOG_ERROR, "Invalid frame header\n");
1665 ✗ return ret;
1666 }
1667 /* update codec info */
1668 ✗ avctx->sample_rate = s->sample_rate;
1669 ✗ av_channel_layout_uninit(&avctx->ch_layout);
1670 ✗ avctx->ch_layout = s->nb_channels == 1 ? (AVChannelLayout)AV_CHANNEL_LAYOUT_MONO :
1671 (AVChannelLayout)AV_CHANNEL_LAYOUT_STEREO;
1672 ✗ if (!avctx->bit_rate)
1673 ✗ avctx->bit_rate = s->bit_rate;
1674
1675 ✗ s->frame_size = len;
1676
1677 ✗ s->frame = frame;
1678
1679 ✗ ret = mp_decode_frame(s, NULL, buf, buf_size);
1680 ✗ if (ret < 0) {
1681 ✗ av_log(avctx, AV_LOG_ERROR, "Error while decoding MPEG audio frame.\n");
1682 ✗ return ret;
1683 }
1684
1685 ✗ *got_frame_ptr = 1;
1686
1687 ✗ return buf_size;
1688 }
1689 #endif /* CONFIG_MP3ADU_DECODER || CONFIG_MP3ADUFLOAT_DECODER */
1690
1691 #if CONFIG_MP3ON4_DECODER || CONFIG_MP3ON4FLOAT_DECODER
1692
1693 /**
1694 * Context for MP3On4 decoder
1695 */
1696 typedef struct MP3On4DecodeContext {
1697 int frames; ///< number of mp3 frames per block (number of mp3 decoder instances)
1698 int syncword; ///< syncword patch
1699 const uint8_t *coff; ///< channel offsets in output buffer
1700 MPADecodeContext *mp3decctx[5]; ///< MPADecodeContext for every decoder instance
1701 } MP3On4DecodeContext;
1702
1703 #include "mpeg4audio.h"
1704
1705 /* Next 3 arrays are indexed by channel config number (passed via codecdata) */
1706
1707 /* number of mp3 decoder instances */
1708 static const uint8_t mp3Frames[8] = { 0, 1, 1, 2, 3, 3, 4, 5 };
1709
1710 /* offsets into output buffer, assume output order is FL FR C LFE BL BR SL SR */
1711 static const uint8_t chan_offset[8][5] = {
1712 { 0 },
1713 { 0 }, // C
1714 { 0 }, // FLR
1715 { 2, 0 }, // C FLR
1716 { 2, 0, 3 }, // C FLR BS
1717 { 2, 0, 3 }, // C FLR BLRS
1718 { 2, 0, 4, 3 }, // C FLR BLRS LFE
1719 { 2, 0, 6, 4, 3 }, // C FLR BLRS BLR LFE
1720 };
1721
1722 /* mp3on4 channel layouts */
1723 static const int16_t chan_layout[8] = {
1724 0,
1725 AV_CH_LAYOUT_MONO,
1726 AV_CH_LAYOUT_STEREO,
1727 AV_CH_LAYOUT_SURROUND,
1728 AV_CH_LAYOUT_4POINT0,
1729 AV_CH_LAYOUT_5POINT0,
1730 AV_CH_LAYOUT_5POINT1,
1731 AV_CH_LAYOUT_7POINT1
1732 };
1733
1734 ✗ static av_cold int decode_close_mp3on4(AVCodecContext * avctx)
1735 {
1736 ✗ MP3On4DecodeContext *s = avctx->priv_data;
1737 int i;
1738
1739 ✗ for (i = 0; i < s->frames; i++)
1740 ✗ av_freep(&s->mp3decctx[i]);
1741
1742 ✗ return 0;
1743 }
1744
1745
1746 ✗ static av_cold int decode_init_mp3on4(AVCodecContext * avctx)
1747 {
1748 ✗ MP3On4DecodeContext *s = avctx->priv_data;
1749 MPEG4AudioConfig cfg;
1750 int i, ret;
1751
1752 ✗ if ((avctx->extradata_size < 2) || !avctx->extradata) {
1753 ✗ av_log(avctx, AV_LOG_ERROR, "Codec extradata missing or too short.\n");
1754 ✗ return AVERROR_INVALIDDATA;
1755 }
1756
1757 ✗ avpriv_mpeg4audio_get_config2(&cfg, avctx->extradata,
1758 avctx->extradata_size, 1, avctx);
1759 ✗ if (!cfg.chan_config || cfg.chan_config > 7) {
1760 ✗ av_log(avctx, AV_LOG_ERROR, "Invalid channel config number.\n");
1761 ✗ return AVERROR_INVALIDDATA;
1762 }
1763 ✗ s->frames = mp3Frames[cfg.chan_config];
1764 ✗ s->coff = chan_offset[cfg.chan_config];
1765 ✗ av_channel_layout_uninit(&avctx->ch_layout);
1766 ✗ av_channel_layout_from_mask(&avctx->ch_layout, chan_layout[cfg.chan_config]);
1767
1768 ✗ if (cfg.sample_rate < 16000)
1769 ✗ s->syncword = 0xffe00000;
1770 else
1771 ✗ s->syncword = 0xfff00000;
1772
1773 /* Init the first mp3 decoder in standard way, so that all tables get builded
1774 * We replace avctx->priv_data with the context of the first decoder so that
1775 * decode_init() does not have to be changed.
1776 * Other decoders will be initialized here copying data from the first context
1777 */
1778 // Allocate zeroed memory for the first decoder context
1779 ✗ s->mp3decctx[0] = av_mallocz(sizeof(MPADecodeContext));
1780 ✗ if (!s->mp3decctx[0])
1781 ✗ return AVERROR(ENOMEM);
1782 // Put decoder context in place to make init_decode() happy
1783 ✗ avctx->priv_data = s->mp3decctx[0];
1784 ✗ ret = decode_init(avctx);
1785 // Restore mp3on4 context pointer
1786 ✗ avctx->priv_data = s;
1787 ✗ if (ret < 0)
1788 ✗ return ret;
1789 ✗ s->mp3decctx[0]->adu_mode = 1; // Set adu mode
1790
1791 /* Create a separate codec/context for each frame (first is already ok).
1792 * Each frame is 1 or 2 channels - up to 5 frames allowed
1793 */
1794 ✗ for (i = 1; i < s->frames; i++) {
1795 ✗ s->mp3decctx[i] = av_mallocz(sizeof(MPADecodeContext));
1796 ✗ if (!s->mp3decctx[i])
1797 ✗ return AVERROR(ENOMEM);
1798 ✗ s->mp3decctx[i]->adu_mode = 1;
1799 ✗ s->mp3decctx[i]->avctx = avctx;
1800 ✗ s->mp3decctx[i]->mpadsp = s->mp3decctx[0]->mpadsp;
1801 ✗ s->mp3decctx[i]->butterflies_float = s->mp3decctx[0]->butterflies_float;
1802 }
1803
1804 ✗ return 0;
1805 }
1806
1807
1808 ✗ static void flush_mp3on4(AVCodecContext *avctx)
1809 {
1810 int i;
1811 ✗ MP3On4DecodeContext *s = avctx->priv_data;
1812
1813 ✗ for (i = 0; i < s->frames; i++)
1814 ✗ mp_flush(s->mp3decctx[i]);
1815 ✗ }
1816
1817
1818 ✗ static int decode_frame_mp3on4(AVCodecContext *avctx, AVFrame *frame,
1819 int *got_frame_ptr, AVPacket *avpkt)
1820 {
1821 ✗ const uint8_t *buf = avpkt->data;
1822 ✗ int buf_size = avpkt->size;
1823 ✗ MP3On4DecodeContext *s = avctx->priv_data;
1824 MPADecodeContext *m;
1825 ✗ int fsize, len = buf_size, out_size = 0;
1826 uint32_t header;
1827 OUT_INT **out_samples;
1828 OUT_INT *outptr[2];
1829 int fr, ch, ret;
1830
1831 /* get output buffer */
1832 ✗ frame->nb_samples = MPA_FRAME_SIZE;
1833 ✗ if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
1834 ✗ return ret;
1835 ✗ out_samples = (OUT_INT **)frame->extended_data;
1836
1837 // Discard too short frames
1838 ✗ if (buf_size < HEADER_SIZE)
1839 ✗ return AVERROR_INVALIDDATA;
1840
1841 ✗ avctx->bit_rate = 0;
1842
1843 ✗ ch = 0;
1844 ✗ for (fr = 0; fr < s->frames; fr++) {
1845 ✗ fsize = AV_RB16(buf) >> 4;
1846 ✗ fsize = FFMIN3(fsize, len, MPA_MAX_CODED_FRAME_SIZE);
1847 ✗ m = s->mp3decctx[fr];
1848 av_assert1(m);
1849
1850 ✗ if (fsize < HEADER_SIZE) {
1851 ✗ av_log(avctx, AV_LOG_ERROR, "Frame size smaller than header size\n");
1852 ✗ return AVERROR_INVALIDDATA;
1853 }
1854 ✗ header = (AV_RB32(buf) & 0x000fffff) | s->syncword; // patch header
1855
1856 ✗ ret = avpriv_mpegaudio_decode_header((MPADecodeHeader *)m, header);
1857 ✗ if (ret < 0) {
1858 ✗ av_log(avctx, AV_LOG_ERROR, "Bad header, discard block\n");
1859 ✗ return AVERROR_INVALIDDATA;
1860 }
1861
1862 ✗ if (ch + m->nb_channels > avctx->ch_layout.nb_channels ||
1863 ✗ s->coff[fr] + m->nb_channels > avctx->ch_layout.nb_channels) {
1864 ✗ av_log(avctx, AV_LOG_ERROR, "frame channel count exceeds codec "
1865 "channel count\n");
1866 ✗ return AVERROR_INVALIDDATA;
1867 }
1868 ✗ ch += m->nb_channels;
1869
1870 ✗ outptr[0] = out_samples[s->coff[fr]];
1871 ✗ if (m->nb_channels > 1)
1872 ✗ outptr[1] = out_samples[s->coff[fr] + 1];
1873
1874 ✗ if ((ret = mp_decode_frame(m, outptr, buf, fsize)) < 0) {
1875 ✗ av_log(avctx, AV_LOG_ERROR, "failed to decode channel %d\n", ch);
1876 ✗ memset(outptr[0], 0, MPA_FRAME_SIZE*sizeof(OUT_INT));
1877 ✗ if (m->nb_channels > 1)
1878 ✗ memset(outptr[1], 0, MPA_FRAME_SIZE*sizeof(OUT_INT));
1879 ✗ ret = m->nb_channels * MPA_FRAME_SIZE*sizeof(OUT_INT);
1880 }
1881
1882 ✗ out_size += ret;
1883 ✗ buf += fsize;
1884 ✗ len -= fsize;
1885
1886 ✗ avctx->bit_rate += m->bit_rate;
1887 }
1888 ✗ if (ch != avctx->ch_layout.nb_channels) {
1889 ✗ av_log(avctx, AV_LOG_ERROR, "failed to decode all channels\n");
1890 ✗ return AVERROR_INVALIDDATA;
1891 }
1892
1893 /* update codec info */
1894 ✗ avctx->sample_rate = s->mp3decctx[0]->sample_rate;
1895
1896 ✗ frame->nb_samples = out_size / (avctx->ch_layout.nb_channels * sizeof(OUT_INT));
1897 ✗ *got_frame_ptr = 1;
1898
1899 ✗ return buf_size;
1900 }
1901 #endif /* CONFIG_MP3ON4_DECODER || CONFIG_MP3ON4FLOAT_DECODER */
1902