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Imported Debian version 2.5.3~trusty1
[deb_ffmpeg.git] / ffmpeg / libavcodec / wavpack.c
CommitLineData
2ba45a60
DM		 1/*
2 * WavPack lossless audio decoder
3 * Copyright (c) 2006,2011 Konstantin Shishkov
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#define BITSTREAM_READER_LE
23
24#include "libavutil/channel_layout.h"
25#include "avcodec.h"
26#include "get_bits.h"
27#include "internal.h"
28#include "thread.h"
29#include "unary.h"
30#include "bytestream.h"
31#include "wavpack.h"
32
33/**
34 * @file
35 * WavPack lossless audio decoder
36 */
37
38typedef struct SavedContext {
39 int offset;
40 int size;
41 int bits_used;
42 uint32_t crc;
43} SavedContext;
44
45typedef struct WavpackFrameContext {
46 AVCodecContext *avctx;
47 int frame_flags;
48 int stereo, stereo_in;
49 int joint;
50 uint32_t CRC;
51 GetBitContext gb;
52 int got_extra_bits;
53 uint32_t crc_extra_bits;
54 GetBitContext gb_extra_bits;
55 int data_size; // in bits
56 int samples;
57 int terms;
58 Decorr decorr[MAX_TERMS];
59 int zero, one, zeroes;
60 int extra_bits;
61 int and, or, shift;
62 int post_shift;
63 int hybrid, hybrid_bitrate;
64 int hybrid_maxclip, hybrid_minclip;
65 int float_flag;
66 int float_shift;
67 int float_max_exp;
68 WvChannel ch[2];
69 int pos;
70 SavedContext sc, extra_sc;
71} WavpackFrameContext;
72
73#define WV_MAX_FRAME_DECODERS 14
74
75typedef struct WavpackContext {
76 AVCodecContext *avctx;
77
78 WavpackFrameContext *fdec[WV_MAX_FRAME_DECODERS];
79 int fdec_num;
80
81 int block;
82 int samples;
83 int ch_offset;
84} WavpackContext;
85
86#define LEVEL_DECAY(a) (((a) + 0x80) >> 8)
87
88static av_always_inline int get_tail(GetBitContext *gb, int k)
89{
90 int p, e, res;
91
92 if (k < 1)
93 return 0;
94 p = av_log2(k);
95 e = (1 << (p + 1)) - k - 1;
96 res = p ? get_bits(gb, p) : 0;
97 if (res >= e)
98 res = (res << 1) - e + get_bits1(gb);
99 return res;
100}
101
102static void update_error_limit(WavpackFrameContext *ctx)
103{
104 int i, br[2], sl[2];
105
106 for (i = 0; i <= ctx->stereo_in; i++) {
107 ctx->ch[i].bitrate_acc += ctx->ch[i].bitrate_delta;
108 br[i] = ctx->ch[i].bitrate_acc >> 16;
109 sl[i] = LEVEL_DECAY(ctx->ch[i].slow_level);
110 }
111 if (ctx->stereo_in && ctx->hybrid_bitrate) {
112 int balance = (sl[1] - sl[0] + br[1] + 1) >> 1;
113 if (balance > br[0]) {
114 br[1] = br[0] << 1;
115 br[0] = 0;
116 } else if (-balance > br[0]) {
117 br[0] <<= 1;
118 br[1] = 0;
119 } else {
120 br[1] = br[0] + balance;
121 br[0] = br[0] - balance;
122 }
123 }
124 for (i = 0; i <= ctx->stereo_in; i++) {
125 if (ctx->hybrid_bitrate) {
126 if (sl[i] - br[i] > -0x100)
127 ctx->ch[i].error_limit = wp_exp2(sl[i] - br[i] + 0x100);
128 else
129 ctx->ch[i].error_limit = 0;
130 } else {
131 ctx->ch[i].error_limit = wp_exp2(br[i]);
132 }
133 }
134}
135
136static int wv_get_value(WavpackFrameContext *ctx, GetBitContext *gb,
137 int channel, int *last)
138{
139 int t, t2;
140 int sign, base, add, ret;
141 WvChannel *c = &ctx->ch[channel];
142
143 *last = 0;
144
145 if ((ctx->ch[0].median[0] < 2U) && (ctx->ch[1].median[0] < 2U) &&
146 !ctx->zero && !ctx->one) {
147 if (ctx->zeroes) {
148 ctx->zeroes--;
149 if (ctx->zeroes) {
150 c->slow_level -= LEVEL_DECAY(c->slow_level);
151 return 0;
152 }
153 } else {
154 t = get_unary_0_33(gb);
155 if (t >= 2) {
156 if (get_bits_left(gb) < t - 1)
157 goto error;
158 t = get_bits(gb, t - 1) | (1 << (t - 1));
159 } else {
160 if (get_bits_left(gb) < 0)
161 goto error;
162 }
163 ctx->zeroes = t;
164 if (ctx->zeroes) {
165 memset(ctx->ch[0].median, 0, sizeof(ctx->ch[0].median));
166 memset(ctx->ch[1].median, 0, sizeof(ctx->ch[1].median));
167 c->slow_level -= LEVEL_DECAY(c->slow_level);
168 return 0;
169 }
170 }
171 }
172
173 if (ctx->zero) {
174 t = 0;
175 ctx->zero = 0;
176 } else {
177 t = get_unary_0_33(gb);
178 if (get_bits_left(gb) < 0)
179 goto error;
180 if (t == 16) {
181 t2 = get_unary_0_33(gb);
182 if (t2 < 2) {
183 if (get_bits_left(gb) < 0)
184 goto error;
185 t += t2;
186 } else {
187 if (get_bits_left(gb) < t2 - 1)
188 goto error;
189 t += get_bits(gb, t2 - 1) | (1 << (t2 - 1));
190 }
191 }
192
193 if (ctx->one) {
194 ctx->one = t & 1;
195 t = (t >> 1) + 1;
196 } else {
197 ctx->one = t & 1;
198 t >>= 1;
199 }
200 ctx->zero = !ctx->one;
201 }
202
203 if (ctx->hybrid && !channel)
204 update_error_limit(ctx);
205
206 if (!t) {
207 base = 0;
208 add = GET_MED(0) - 1;
209 DEC_MED(0);
210 } else if (t == 1) {
211 base = GET_MED(0);
212 add = GET_MED(1) - 1;
213 INC_MED(0);
214 DEC_MED(1);
215 } else if (t == 2) {
216 base = GET_MED(0) + GET_MED(1);
217 add = GET_MED(2) - 1;
218 INC_MED(0);
219 INC_MED(1);
220 DEC_MED(2);
221 } else {
222 base = GET_MED(0) + GET_MED(1) + GET_MED(2) * (t - 2);
223 add = GET_MED(2) - 1;
224 INC_MED(0);
225 INC_MED(1);
226 INC_MED(2);
227 }
228 if (!c->error_limit) {
229 if (add >= 0x2000000U) {
230 av_log(ctx->avctx, AV_LOG_ERROR, "k %d is too large\n", add);
231 goto error;
232 }
233 ret = base + get_tail(gb, add);
234 if (get_bits_left(gb) <= 0)
235 goto error;
236 } else {
237 int mid = (base * 2 + add + 1) >> 1;
238 while (add > c->error_limit) {
239 if (get_bits_left(gb) <= 0)
240 goto error;
241 if (get_bits1(gb)) {
242 add -= (mid - base);
243 base = mid;
244 } else
245 add = mid - base - 1;
246 mid = (base * 2 + add + 1) >> 1;
247 }
248 ret = mid;
249 }
250 sign = get_bits1(gb);
251 if (ctx->hybrid_bitrate)
252 c->slow_level += wp_log2(ret) - LEVEL_DECAY(c->slow_level);
253 return sign ? ~ret : ret;
254
255error:
256 ret = get_bits_left(gb);
257 if (ret <= 0) {
258 av_log(ctx->avctx, AV_LOG_ERROR, "Too few bits (%d) left\n", ret);
259 }
260 *last = 1;
261 return 0;
262}
263
264static inline int wv_get_value_integer(WavpackFrameContext *s, uint32_t *crc,
265 int S)
266{
267 int bit;
268
269 if (s->extra_bits) {
270 S <<= s->extra_bits;
271
272 if (s->got_extra_bits &&
273 get_bits_left(&s->gb_extra_bits) >= s->extra_bits) {
274 S |= get_bits(&s->gb_extra_bits, s->extra_bits);
275 *crc = *crc * 9 + (S & 0xffff) * 3 + ((unsigned)S >> 16);
276 }
277 }
278
279 bit = (S & s->and) | s->or;
280 bit = ((S + bit) << s->shift) - bit;
281
282 if (s->hybrid)
283 bit = av_clip(bit, s->hybrid_minclip, s->hybrid_maxclip);
284
285 return bit << s->post_shift;
286}
287
288static float wv_get_value_float(WavpackFrameContext *s, uint32_t *crc, int S)
289{
290 union {
291 float f;
292 uint32_t u;
293 } value;
294
295 unsigned int sign;
296 int exp = s->float_max_exp;
297
298 if (s->got_extra_bits) {
299 const int max_bits = 1 + 23 + 8 + 1;
300 const int left_bits = get_bits_left(&s->gb_extra_bits);
301
302 if (left_bits + 8 * FF_INPUT_BUFFER_PADDING_SIZE < max_bits)
303 return 0.0;
304 }
305
306 if (S) {
307 S <<= s->float_shift;
308 sign = S < 0;
309 if (sign)
310 S = -S;
311 if (S >= 0x1000000) {
312 if (s->got_extra_bits && get_bits1(&s->gb_extra_bits))
313 S = get_bits(&s->gb_extra_bits, 23);
314 else
315 S = 0;
316 exp = 255;
317 } else if (exp) {
318 int shift = 23 - av_log2(S);
319 exp = s->float_max_exp;
320 if (exp <= shift)
321 shift = --exp;
322 exp -= shift;
323
324 if (shift) {
325 S <<= shift;
326 if ((s->float_flag & WV_FLT_SHIFT_ONES) ||
327 (s->got_extra_bits &&
328 (s->float_flag & WV_FLT_SHIFT_SAME) &&
329 get_bits1(&s->gb_extra_bits))) {
330 S |= (1 << shift) - 1;
331 } else if (s->got_extra_bits &&
332 (s->float_flag & WV_FLT_SHIFT_SENT)) {
333 S |= get_bits(&s->gb_extra_bits, shift);
334 }
335 }
336 } else {
337 exp = s->float_max_exp;
338 }
339 S &= 0x7fffff;
340 } else {
341 sign = 0;
342 exp = 0;
343 if (s->got_extra_bits && (s->float_flag & WV_FLT_ZERO_SENT)) {
344 if (get_bits1(&s->gb_extra_bits)) {
345 S = get_bits(&s->gb_extra_bits, 23);
346 if (s->float_max_exp >= 25)
347 exp = get_bits(&s->gb_extra_bits, 8);
348 sign = get_bits1(&s->gb_extra_bits);
349 } else {
350 if (s->float_flag & WV_FLT_ZERO_SIGN)
351 sign = get_bits1(&s->gb_extra_bits);
352 }
353 }
354 }
355
356 *crc = *crc * 27 + S * 9 + exp * 3 + sign;
357
358 value.u = (sign << 31) | (exp << 23) | S;
359 return value.f;
360}
361
362static void wv_reset_saved_context(WavpackFrameContext *s)
363{
364 s->pos = 0;
365 s->sc.crc = s->extra_sc.crc = 0xFFFFFFFF;
366}
367
368static inline int wv_check_crc(WavpackFrameContext *s, uint32_t crc,
369 uint32_t crc_extra_bits)
370{
371 if (crc != s->CRC) {
372 av_log(s->avctx, AV_LOG_ERROR, "CRC error\n");
373 return AVERROR_INVALIDDATA;
374 }
375 if (s->got_extra_bits && crc_extra_bits != s->crc_extra_bits) {
376 av_log(s->avctx, AV_LOG_ERROR, "Extra bits CRC error\n");
377 return AVERROR_INVALIDDATA;
378 }
379
380 return 0;
381}
382
383static inline int wv_unpack_stereo(WavpackFrameContext *s, GetBitContext *gb,
384 void *dst_l, void *dst_r, const int type)
385{
386 int i, j, count = 0;
387 int last, t;
388 int A, B, L, L2, R, R2;
389 int pos = s->pos;
390 uint32_t crc = s->sc.crc;
391 uint32_t crc_extra_bits = s->extra_sc.crc;
392 int16_t *dst16_l = dst_l;
393 int16_t *dst16_r = dst_r;
394 int32_t *dst32_l = dst_l;
395 int32_t *dst32_r = dst_r;
396 float *dstfl_l = dst_l;
397 float *dstfl_r = dst_r;
398
399 s->one = s->zero = s->zeroes = 0;
400 do {
401 L = wv_get_value(s, gb, 0, &last);
402 if (last)
403 break;
404 R = wv_get_value(s, gb, 1, &last);
405 if (last)
406 break;
407 for (i = 0; i < s->terms; i++) {
408 t = s->decorr[i].value;
409 if (t > 0) {
410 if (t > 8) {
411 if (t & 1) {
412 A = 2 * s->decorr[i].samplesA[0] - s->decorr[i].samplesA[1];
413 B = 2 * s->decorr[i].samplesB[0] - s->decorr[i].samplesB[1];
414 } else {
415 A = (3 * s->decorr[i].samplesA[0] - s->decorr[i].samplesA[1]) >> 1;
416 B = (3 * s->decorr[i].samplesB[0] - s->decorr[i].samplesB[1]) >> 1;
417 }
418 s->decorr[i].samplesA[1] = s->decorr[i].samplesA[0];
419 s->decorr[i].samplesB[1] = s->decorr[i].samplesB[0];
420 j = 0;
421 } else {
422 A = s->decorr[i].samplesA[pos];
423 B = s->decorr[i].samplesB[pos];
424 j = (pos + t) & 7;
425 }
426 if (type != AV_SAMPLE_FMT_S16P) {
427 L2 = L + ((s->decorr[i].weightA * (int64_t)A + 512) >> 10);
428 R2 = R + ((s->decorr[i].weightB * (int64_t)B + 512) >> 10);
429 } else {
430 L2 = L + ((s->decorr[i].weightA * A + 512) >> 10);
431 R2 = R + ((s->decorr[i].weightB * B + 512) >> 10);
432 }
433 if (A && L)
434 s->decorr[i].weightA -= ((((L ^ A) >> 30) & 2) - 1) * s->decorr[i].delta;
435 if (B && R)
436 s->decorr[i].weightB -= ((((R ^ B) >> 30) & 2) - 1) * s->decorr[i].delta;
437 s->decorr[i].samplesA[j] = L = L2;
438 s->decorr[i].samplesB[j] = R = R2;
439 } else if (t == -1) {
440 if (type != AV_SAMPLE_FMT_S16P)
441 L2 = L + ((s->decorr[i].weightA * (int64_t)s->decorr[i].samplesA[0] + 512) >> 10);
442 else
443 L2 = L + ((s->decorr[i].weightA * s->decorr[i].samplesA[0] + 512) >> 10);
444 UPDATE_WEIGHT_CLIP(s->decorr[i].weightA, s->decorr[i].delta, s->decorr[i].samplesA[0], L);
445 L = L2;
446 if (type != AV_SAMPLE_FMT_S16P)
447 R2 = R + ((s->decorr[i].weightB * (int64_t)L2 + 512) >> 10);
448 else
449 R2 = R + ((s->decorr[i].weightB * L2 + 512) >> 10);
450 UPDATE_WEIGHT_CLIP(s->decorr[i].weightB, s->decorr[i].delta, L2, R);
451 R = R2;
452 s->decorr[i].samplesA[0] = R;
453 } else {
454 if (type != AV_SAMPLE_FMT_S16P)
455 R2 = R + ((s->decorr[i].weightB * (int64_t)s->decorr[i].samplesB[0] + 512) >> 10);
456 else
457 R2 = R + ((s->decorr[i].weightB * s->decorr[i].samplesB[0] + 512) >> 10);
458 UPDATE_WEIGHT_CLIP(s->decorr[i].weightB, s->decorr[i].delta, s->decorr[i].samplesB[0], R);
459 R = R2;
460
461 if (t == -3) {
462 R2 = s->decorr[i].samplesA[0];
463 s->decorr[i].samplesA[0] = R;
464 }
465
466 if (type != AV_SAMPLE_FMT_S16P)
467 L2 = L + ((s->decorr[i].weightA * (int64_t)R2 + 512) >> 10);
468 else
469 L2 = L + ((s->decorr[i].weightA * R2 + 512) >> 10);
470 UPDATE_WEIGHT_CLIP(s->decorr[i].weightA, s->decorr[i].delta, R2, L);
471 L = L2;
472 s->decorr[i].samplesB[0] = L;
473 }
474 }
475 pos = (pos + 1) & 7;
476 if (s->joint)
477 L += (R -= (L >> 1));
478 crc = (crc * 3 + L) * 3 + R;
479
480 if (type == AV_SAMPLE_FMT_FLTP) {
481 *dstfl_l++ = wv_get_value_float(s, &crc_extra_bits, L);
482 *dstfl_r++ = wv_get_value_float(s, &crc_extra_bits, R);
483 } else if (type == AV_SAMPLE_FMT_S32P) {
484 *dst32_l++ = wv_get_value_integer(s, &crc_extra_bits, L);
485 *dst32_r++ = wv_get_value_integer(s, &crc_extra_bits, R);
486 } else {
487 *dst16_l++ = wv_get_value_integer(s, &crc_extra_bits, L);
488 *dst16_r++ = wv_get_value_integer(s, &crc_extra_bits, R);
489 }
490 count++;
491 } while (!last && count < s->samples);
492
493 wv_reset_saved_context(s);
494
495 if (last && count < s->samples) {
496 int size = av_get_bytes_per_sample(type);
497 memset((uint8_t*)dst_l + count*size, 0, (s->samples-count)*size);
498 memset((uint8_t*)dst_r + count*size, 0, (s->samples-count)*size);
499 }
500
501 if ((s->avctx->err_recognition & AV_EF_CRCCHECK) &&
502 wv_check_crc(s, crc, crc_extra_bits))
503 return AVERROR_INVALIDDATA;
504
505 return 0;
506}
507
508static inline int wv_unpack_mono(WavpackFrameContext *s, GetBitContext *gb,
509 void *dst, const int type)
510{
511 int i, j, count = 0;
512 int last, t;
513 int A, S, T;
514 int pos = s->pos;
515 uint32_t crc = s->sc.crc;
516 uint32_t crc_extra_bits = s->extra_sc.crc;
517 int16_t *dst16 = dst;
518 int32_t *dst32 = dst;
519 float *dstfl = dst;
520
521 s->one = s->zero = s->zeroes = 0;
522 do {
523 T = wv_get_value(s, gb, 0, &last);
524 S = 0;
525 if (last)
526 break;
527 for (i = 0; i < s->terms; i++) {
528 t = s->decorr[i].value;
529 if (t > 8) {
530 if (t & 1)
531 A = 2 * s->decorr[i].samplesA[0] - s->decorr[i].samplesA[1];
532 else
533 A = (3 * s->decorr[i].samplesA[0] - s->decorr[i].samplesA[1]) >> 1;
534 s->decorr[i].samplesA[1] = s->decorr[i].samplesA[0];
535 j = 0;
536 } else {
537 A = s->decorr[i].samplesA[pos];
538 j = (pos + t) & 7;
539 }
540 if (type != AV_SAMPLE_FMT_S16P)
541 S = T + ((s->decorr[i].weightA * (int64_t)A + 512) >> 10);
542 else
543 S = T + ((s->decorr[i].weightA * A + 512) >> 10);
544 if (A && T)
545 s->decorr[i].weightA -= ((((T ^ A) >> 30) & 2) - 1) * s->decorr[i].delta;
546 s->decorr[i].samplesA[j] = T = S;
547 }
548 pos = (pos + 1) & 7;
549 crc = crc * 3 + S;
550
551 if (type == AV_SAMPLE_FMT_FLTP) {
552 *dstfl++ = wv_get_value_float(s, &crc_extra_bits, S);
553 } else if (type == AV_SAMPLE_FMT_S32P) {
554 *dst32++ = wv_get_value_integer(s, &crc_extra_bits, S);
555 } else {
556 *dst16++ = wv_get_value_integer(s, &crc_extra_bits, S);
557 }
558 count++;
559 } while (!last && count < s->samples);
560
561 wv_reset_saved_context(s);
562
563 if (last && count < s->samples) {
564 int size = av_get_bytes_per_sample(type);
565 memset((uint8_t*)dst + count*size, 0, (s->samples-count)*size);
566 }
567
568 if (s->avctx->err_recognition & AV_EF_CRCCHECK) {
569 int ret = wv_check_crc(s, crc, crc_extra_bits);
570 if (ret < 0 && s->avctx->err_recognition & AV_EF_EXPLODE)
571 return ret;
572 }
573
574 return 0;
575}
576
577static av_cold int wv_alloc_frame_context(WavpackContext *c)
578{
579 if (c->fdec_num == WV_MAX_FRAME_DECODERS)
580 return -1;
581
582 c->fdec[c->fdec_num] = av_mallocz(sizeof(**c->fdec));
583 if (!c->fdec[c->fdec_num])
584 return -1;
585 c->fdec_num++;
586 c->fdec[c->fdec_num - 1]->avctx = c->avctx;
587 wv_reset_saved_context(c->fdec[c->fdec_num - 1]);
588
589 return 0;
590}
591
592static int init_thread_copy(AVCodecContext *avctx)
593{
594 WavpackContext *s = avctx->priv_data;
595 s->avctx = avctx;
596 return 0;
597}
598
599static av_cold int wavpack_decode_init(AVCodecContext *avctx)
600{
601 WavpackContext *s = avctx->priv_data;
602
603 s->avctx = avctx;
604
605 s->fdec_num = 0;
606
607 return 0;
608}
609
610static av_cold int wavpack_decode_end(AVCodecContext *avctx)
611{
612 WavpackContext *s = avctx->priv_data;
613 int i;
614
615 for (i = 0; i < s->fdec_num; i++)
616 av_freep(&s->fdec[i]);
617 s->fdec_num = 0;
618
619 return 0;
620}
621
622static int wavpack_decode_block(AVCodecContext *avctx, int block_no,
623 AVFrame *frame, const uint8_t *buf, int buf_size)
624{
625 WavpackContext *wc = avctx->priv_data;
626 ThreadFrame tframe = { .f = frame };
627 WavpackFrameContext *s;
628 GetByteContext gb;
629 void *samples_l = NULL, *samples_r = NULL;
630 int ret;
631 int got_terms = 0, got_weights = 0, got_samples = 0,
632 got_entropy = 0, got_bs = 0, got_float = 0, got_hybrid = 0;
633 int i, j, id, size, ssize, weights, t;
634 int bpp, chan = 0, chmask = 0, orig_bpp, sample_rate = 0;
635 int multiblock;
636
637 if (block_no >= wc->fdec_num && wv_alloc_frame_context(wc) < 0) {
638 av_log(avctx, AV_LOG_ERROR, "Error creating frame decode context\n");
639 return AVERROR_INVALIDDATA;
640 }
641
642 s = wc->fdec[block_no];
643 if (!s) {
644 av_log(avctx, AV_LOG_ERROR, "Context for block %d is not present\n",
645 block_no);
646 return AVERROR_INVALIDDATA;
647 }
648
649 memset(s->decorr, 0, MAX_TERMS * sizeof(Decorr));
650 memset(s->ch, 0, sizeof(s->ch));
651 s->extra_bits = 0;
652 s->and = s->or = s->shift = 0;
653 s->got_extra_bits = 0;
654
655 bytestream2_init(&gb, buf, buf_size);
656
657 s->samples = bytestream2_get_le32(&gb);
658 if (s->samples != wc->samples) {
659 av_log(avctx, AV_LOG_ERROR, "Mismatching number of samples in "
660 "a sequence: %d and %d\n", wc->samples, s->samples);
661 return AVERROR_INVALIDDATA;
662 }
663 s->frame_flags = bytestream2_get_le32(&gb);
664 bpp = av_get_bytes_per_sample(avctx->sample_fmt);
665 orig_bpp = ((s->frame_flags & 0x03) + 1) << 3;
666 multiblock = (s->frame_flags & WV_SINGLE_BLOCK) != WV_SINGLE_BLOCK;
667
668 s->stereo = !(s->frame_flags & WV_MONO);
669 s->stereo_in = (s->frame_flags & WV_FALSE_STEREO) ? 0 : s->stereo;
670 s->joint = s->frame_flags & WV_JOINT_STEREO;
671 s->hybrid = s->frame_flags & WV_HYBRID_MODE;
672 s->hybrid_bitrate = s->frame_flags & WV_HYBRID_BITRATE;
673 s->post_shift = bpp * 8 - orig_bpp + ((s->frame_flags >> 13) & 0x1f);
674 s->hybrid_maxclip = ((1LL << (orig_bpp - 1)) - 1);
675 s->hybrid_minclip = ((-1LL << (orig_bpp - 1)));
676 s->CRC = bytestream2_get_le32(&gb);
677
678 // parse metadata blocks
679 while (bytestream2_get_bytes_left(&gb)) {
680 id = bytestream2_get_byte(&gb);
681 size = bytestream2_get_byte(&gb);
682 if (id & WP_IDF_LONG) {
683 size |= (bytestream2_get_byte(&gb)) << 8;
684 size |= (bytestream2_get_byte(&gb)) << 16;
685 }
686 size <<= 1; // size is specified in words
687 ssize = size;
688 if (id & WP_IDF_ODD)
689 size--;
690 if (size < 0) {
691 av_log(avctx, AV_LOG_ERROR,
692 "Got incorrect block %02X with size %i\n", id, size);
693 break;
694 }
695 if (bytestream2_get_bytes_left(&gb) < ssize) {
696 av_log(avctx, AV_LOG_ERROR,
697 "Block size %i is out of bounds\n", size);
698 break;
699 }
700 switch (id & WP_IDF_MASK) {
701 case WP_ID_DECTERMS:
702 if (size > MAX_TERMS) {
703 av_log(avctx, AV_LOG_ERROR, "Too many decorrelation terms\n");
704 s->terms = 0;
705 bytestream2_skip(&gb, ssize);
706 continue;
707 }
708 s->terms = size;
709 for (i = 0; i < s->terms; i++) {
710 uint8_t val = bytestream2_get_byte(&gb);
711 s->decorr[s->terms - i - 1].value = (val & 0x1F) - 5;
712 s->decorr[s->terms - i - 1].delta = val >> 5;
713 }
714 got_terms = 1;
715 break;
716 case WP_ID_DECWEIGHTS:
717 if (!got_terms) {
718 av_log(avctx, AV_LOG_ERROR, "No decorrelation terms met\n");
719 continue;
720 }
721 weights = size >> s->stereo_in;
722 if (weights > MAX_TERMS || weights > s->terms) {
723 av_log(avctx, AV_LOG_ERROR, "Too many decorrelation weights\n");
724 bytestream2_skip(&gb, ssize);
725 continue;
726 }
727 for (i = 0; i < weights; i++) {
728 t = (int8_t)bytestream2_get_byte(&gb);
729 s->decorr[s->terms - i - 1].weightA = t << 3;
730 if (s->decorr[s->terms - i - 1].weightA > 0)
731 s->decorr[s->terms - i - 1].weightA +=
732 (s->decorr[s->terms - i - 1].weightA + 64) >> 7;
733 if (s->stereo_in) {
734 t = (int8_t)bytestream2_get_byte(&gb);
735 s->decorr[s->terms - i - 1].weightB = t << 3;
736 if (s->decorr[s->terms - i - 1].weightB > 0)
737 s->decorr[s->terms - i - 1].weightB +=
738 (s->decorr[s->terms - i - 1].weightB + 64) >> 7;
739 }
740 }
741 got_weights = 1;
742 break;
743 case WP_ID_DECSAMPLES:
744 if (!got_terms) {
745 av_log(avctx, AV_LOG_ERROR, "No decorrelation terms met\n");
746 continue;
747 }
748 t = 0;
749 for (i = s->terms - 1; (i >= 0) && (t < size); i--) {
750 if (s->decorr[i].value > 8) {
751 s->decorr[i].samplesA[0] =
752 wp_exp2(bytestream2_get_le16(&gb));
753 s->decorr[i].samplesA[1] =
754 wp_exp2(bytestream2_get_le16(&gb));
755
756 if (s->stereo_in) {
757 s->decorr[i].samplesB[0] =
758 wp_exp2(bytestream2_get_le16(&gb));
759 s->decorr[i].samplesB[1] =
760 wp_exp2(bytestream2_get_le16(&gb));
761 t += 4;
762 }
763 t += 4;
764 } else if (s->decorr[i].value < 0) {
765 s->decorr[i].samplesA[0] =
766 wp_exp2(bytestream2_get_le16(&gb));
767 s->decorr[i].samplesB[0] =
768 wp_exp2(bytestream2_get_le16(&gb));
769 t += 4;
770 } else {
771 for (j = 0; j < s->decorr[i].value; j++) {
772 s->decorr[i].samplesA[j] =
773 wp_exp2(bytestream2_get_le16(&gb));
774 if (s->stereo_in) {
775 s->decorr[i].samplesB[j] =
776 wp_exp2(bytestream2_get_le16(&gb));
777 }
778 }
779 t += s->decorr[i].value * 2 * (s->stereo_in + 1);
780 }
781 }
782 got_samples = 1;
783 break;
784 case WP_ID_ENTROPY:
785 if (size != 6 * (s->stereo_in + 1)) {
786 av_log(avctx, AV_LOG_ERROR,
787 "Entropy vars size should be %i, got %i.\n",
788 6 * (s->stereo_in + 1), size);
789 bytestream2_skip(&gb, ssize);
790 continue;
791 }
792 for (j = 0; j <= s->stereo_in; j++)
793 for (i = 0; i < 3; i++) {
794 s->ch[j].median[i] = wp_exp2(bytestream2_get_le16(&gb));
795 }
796 got_entropy = 1;
797 break;
798 case WP_ID_HYBRID:
799 if (s->hybrid_bitrate) {
800 for (i = 0; i <= s->stereo_in; i++) {
801 s->ch[i].slow_level = wp_exp2(bytestream2_get_le16(&gb));
802 size -= 2;
803 }
804 }
805 for (i = 0; i < (s->stereo_in + 1); i++) {
806 s->ch[i].bitrate_acc = bytestream2_get_le16(&gb) << 16;
807 size -= 2;
808 }
809 if (size > 0) {
810 for (i = 0; i < (s->stereo_in + 1); i++) {
811 s->ch[i].bitrate_delta =
812 wp_exp2((int16_t)bytestream2_get_le16(&gb));
813 }
814 } else {
815 for (i = 0; i < (s->stereo_in + 1); i++)
816 s->ch[i].bitrate_delta = 0;
817 }
818 got_hybrid = 1;
819 break;
820 case WP_ID_INT32INFO: {
821 uint8_t val[4];
822 if (size != 4) {
823 av_log(avctx, AV_LOG_ERROR,
824 "Invalid INT32INFO, size = %i\n",
825 size);
826 bytestream2_skip(&gb, ssize - 4);
827 continue;
828 }
829 bytestream2_get_buffer(&gb, val, 4);
830 if (val[0]) {
831 s->extra_bits = val[0];
832 } else if (val[1]) {
833 s->shift = val[1];
834 } else if (val[2]) {
835 s->and = s->or = 1;
836 s->shift = val[2];
837 } else if (val[3]) {
838 s->and = 1;
839 s->shift = val[3];
840 }
841 /* original WavPack decoder forces 32-bit lossy sound to be treated
842 * as 24-bit one in order to have proper clipping */
843 if (s->hybrid && bpp == 4 && s->post_shift < 8 && s->shift > 8) {
844 s->post_shift += 8;
845 s->shift -= 8;
846 s->hybrid_maxclip >>= 8;
847 s->hybrid_minclip >>= 8;
848 }
849 break;
850 }
851 case WP_ID_FLOATINFO:
852 if (size != 4) {
853 av_log(avctx, AV_LOG_ERROR,
854 "Invalid FLOATINFO, size = %i\n", size);
855 bytestream2_skip(&gb, ssize);
856 continue;
857 }
858 s->float_flag = bytestream2_get_byte(&gb);
859 s->float_shift = bytestream2_get_byte(&gb);
860 s->float_max_exp = bytestream2_get_byte(&gb);
861 got_float = 1;
862 bytestream2_skip(&gb, 1);
863 break;
864 case WP_ID_DATA:
865 s->sc.offset = bytestream2_tell(&gb);
866 s->sc.size = size * 8;
867 if ((ret = init_get_bits8(&s->gb, gb.buffer, size)) < 0)
868 return ret;
869 s->data_size = size * 8;
870 bytestream2_skip(&gb, size);
871 got_bs = 1;
872 break;
873 case WP_ID_EXTRABITS:
874 if (size <= 4) {
875 av_log(avctx, AV_LOG_ERROR, "Invalid EXTRABITS, size = %i\n",
876 size);
877 bytestream2_skip(&gb, size);
878 continue;
879 }
880 s->extra_sc.offset = bytestream2_tell(&gb);
881 s->extra_sc.size = size * 8;
882 if ((ret = init_get_bits8(&s->gb_extra_bits, gb.buffer, size)) < 0)
883 return ret;
884 s->crc_extra_bits = get_bits_long(&s->gb_extra_bits, 32);
885 bytestream2_skip(&gb, size);
886 s->got_extra_bits = 1;
887 break;
888 case WP_ID_CHANINFO:
889 if (size <= 1) {
890 av_log(avctx, AV_LOG_ERROR,
891 "Insufficient channel information\n");
892 return AVERROR_INVALIDDATA;
893 }
894 chan = bytestream2_get_byte(&gb);
895 switch (size - 2) {
896 case 0:
897 chmask = bytestream2_get_byte(&gb);
898 break;
899 case 1:
900 chmask = bytestream2_get_le16(&gb);
901 break;
902 case 2:
903 chmask = bytestream2_get_le24(&gb);
904 break;
905 case 3:
906 chmask = bytestream2_get_le32(&gb);
907 break;
908 case 5:
909 size = bytestream2_get_byte(&gb);
910 if (avctx->channels != size)
911 av_log(avctx, AV_LOG_WARNING, "%i channels signalled"
912 " instead of %i.\n", size, avctx->channels);
913 chan |= (bytestream2_get_byte(&gb) & 0xF) << 8;
914 chmask = bytestream2_get_le16(&gb);
915 break;
916 default:
917 av_log(avctx, AV_LOG_ERROR, "Invalid channel info size %d\n",
918 size);
919 chan = avctx->channels;
920 chmask = avctx->channel_layout;
921 }
922 break;
923 case WP_ID_SAMPLE_RATE:
924 if (size != 3) {
925 av_log(avctx, AV_LOG_ERROR, "Invalid custom sample rate.\n");
926 return AVERROR_INVALIDDATA;
927 }
928 sample_rate = bytestream2_get_le24(&gb);
929 break;
930 default:
931 bytestream2_skip(&gb, size);
932 }
933 if (id & WP_IDF_ODD)
934 bytestream2_skip(&gb, 1);
935 }
936
937 if (!got_terms) {
938 av_log(avctx, AV_LOG_ERROR, "No block with decorrelation terms\n");
939 return AVERROR_INVALIDDATA;
940 }
941 if (!got_weights) {
942 av_log(avctx, AV_LOG_ERROR, "No block with decorrelation weights\n");
943 return AVERROR_INVALIDDATA;
944 }
945 if (!got_samples) {
946 av_log(avctx, AV_LOG_ERROR, "No block with decorrelation samples\n");
947 return AVERROR_INVALIDDATA;
948 }
949 if (!got_entropy) {
950 av_log(avctx, AV_LOG_ERROR, "No block with entropy info\n");
951 return AVERROR_INVALIDDATA;
952 }
953 if (s->hybrid && !got_hybrid) {
954 av_log(avctx, AV_LOG_ERROR, "Hybrid config not found\n");
955 return AVERROR_INVALIDDATA;
956 }
957 if (!got_bs) {
958 av_log(avctx, AV_LOG_ERROR, "Packed samples not found\n");
959 return AVERROR_INVALIDDATA;
960 }
961 if (!got_float && avctx->sample_fmt == AV_SAMPLE_FMT_FLTP) {
962 av_log(avctx, AV_LOG_ERROR, "Float information not found\n");
963 return AVERROR_INVALIDDATA;
964 }
965 if (s->got_extra_bits && avctx->sample_fmt != AV_SAMPLE_FMT_FLTP) {
966 const int size = get_bits_left(&s->gb_extra_bits);
967 const int wanted = s->samples * s->extra_bits << s->stereo_in;
968 if (size < wanted) {
969 av_log(avctx, AV_LOG_ERROR, "Too small EXTRABITS\n");
970 s->got_extra_bits = 0;
971 }
972 }
973
974 if (!wc->ch_offset) {
975 int sr = (s->frame_flags >> 23) & 0xf;
976 if (sr == 0xf) {
977 if (!sample_rate) {
978 av_log(avctx, AV_LOG_ERROR, "Custom sample rate missing.\n");
979 return AVERROR_INVALIDDATA;
980 }
981 avctx->sample_rate = sample_rate;
982 } else
983 avctx->sample_rate = wv_rates[sr];
984
985 if (multiblock) {
986 if (chan)
987 avctx->channels = chan;
988 if (chmask)
989 avctx->channel_layout = chmask;
990 } else {
991 avctx->channels = s->stereo ? 2 : 1;
992 avctx->channel_layout = s->stereo ? AV_CH_LAYOUT_STEREO :
993 AV_CH_LAYOUT_MONO;
994 }
995
996 /* get output buffer */
997 frame->nb_samples = s->samples + 1;
998 if ((ret = ff_thread_get_buffer(avctx, &tframe, 0)) < 0)
999 return ret;
1000 frame->nb_samples = s->samples;
1001 }
1002
1003 if (wc->ch_offset + s->stereo >= avctx->channels) {
1004 av_log(avctx, AV_LOG_WARNING, "Too many channels coded in a packet.\n");
1005 return (avctx->err_recognition & AV_EF_EXPLODE) ? AVERROR_INVALIDDATA : 0;
1006 }
1007
1008 samples_l = frame->extended_data[wc->ch_offset];
1009 if (s->stereo)
1010 samples_r = frame->extended_data[wc->ch_offset + 1];
1011
1012 wc->ch_offset += 1 + s->stereo;
1013
1014 if (s->stereo_in) {
1015 ret = wv_unpack_stereo(s, &s->gb, samples_l, samples_r, avctx->sample_fmt);
1016 if (ret < 0)
1017 return ret;
1018 } else {
1019 ret = wv_unpack_mono(s, &s->gb, samples_l, avctx->sample_fmt);
1020 if (ret < 0)
1021 return ret;
1022
1023 if (s->stereo)
1024 memcpy(samples_r, samples_l, bpp * s->samples);
1025 }
1026
1027 return 0;
1028}
1029
1030static void wavpack_decode_flush(AVCodecContext *avctx)
1031{
1032 WavpackContext *s = avctx->priv_data;
1033 int i;
1034
1035 for (i = 0; i < s->fdec_num; i++)
1036 wv_reset_saved_context(s->fdec[i]);
1037}
1038
1039static int wavpack_decode_frame(AVCodecContext *avctx, void *data,
1040 int *got_frame_ptr, AVPacket *avpkt)
1041{
1042 WavpackContext *s = avctx->priv_data;
1043 const uint8_t *buf = avpkt->data;
1044 int buf_size = avpkt->size;
1045 AVFrame *frame = data;
1046 int frame_size, ret, frame_flags;
1047
1048 if (avpkt->size <= WV_HEADER_SIZE)
1049 return AVERROR_INVALIDDATA;
1050
1051 s->block = 0;
1052 s->ch_offset = 0;
1053
1054 /* determine number of samples */
1055 s->samples = AV_RL32(buf + 20);
1056 frame_flags = AV_RL32(buf + 24);
1057 if (s->samples <= 0 || s->samples > WV_MAX_SAMPLES) {
1058 av_log(avctx, AV_LOG_ERROR, "Invalid number of samples: %d\n",
1059 s->samples);
1060 return AVERROR_INVALIDDATA;
1061 }
1062
1063 if (frame_flags & 0x80) {
1064 avctx->sample_fmt = AV_SAMPLE_FMT_FLTP;
1065 } else if ((frame_flags & 0x03) <= 1) {
1066 avctx->sample_fmt = AV_SAMPLE_FMT_S16P;
1067 } else {
1068 avctx->sample_fmt = AV_SAMPLE_FMT_S32P;
1069 avctx->bits_per_raw_sample = ((frame_flags & 0x03) + 1) << 3;
1070 }
1071
1072 while (buf_size > 0) {
1073 if (buf_size <= WV_HEADER_SIZE)
1074 break;
1075 frame_size = AV_RL32(buf + 4) - 12;
1076 buf += 20;
1077 buf_size -= 20;
1078 if (frame_size <= 0 || frame_size > buf_size) {
1079 av_log(avctx, AV_LOG_ERROR,
1080 "Block %d has invalid size (size %d vs. %d bytes left)\n",
1081 s->block, frame_size, buf_size);
1082 wavpack_decode_flush(avctx);
1083 return AVERROR_INVALIDDATA;
1084 }
1085 if ((ret = wavpack_decode_block(avctx, s->block,
1086 frame, buf, frame_size)) < 0) {
1087 wavpack_decode_flush(avctx);
1088 return ret;
1089 }
1090 s->block++;
1091 buf += frame_size;
1092 buf_size -= frame_size;
1093 }
1094
1095 if (s->ch_offset != avctx->channels) {
1096 av_log(avctx, AV_LOG_ERROR, "Not enough channels coded in a packet.\n");
1097 return AVERROR_INVALIDDATA;
1098 }
1099
1100 *got_frame_ptr = 1;
1101
1102 return avpkt->size;
1103}
1104
1105AVCodec ff_wavpack_decoder = {
1106 .name = "wavpack",
1107 .long_name = NULL_IF_CONFIG_SMALL("WavPack"),
1108 .type = AVMEDIA_TYPE_AUDIO,
1109 .id = AV_CODEC_ID_WAVPACK,
1110 .priv_data_size = sizeof(WavpackContext),
1111 .init = wavpack_decode_init,
1112 .close = wavpack_decode_end,
1113 .decode = wavpack_decode_frame,
1114 .flush = wavpack_decode_flush,
1115 .init_thread_copy = ONLY_IF_THREADS_ENABLED(init_thread_copy),
1116 .capabilities = CODEC_CAP_DR1 | CODEC_CAP_FRAME_THREADS,
1117};
ffmpeg Piment Noir Debian package repository