1 /*
2  * TAK decoder
3  * Copyright (c) 2012 Paul B Mahol
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  * TAK (Tom's lossless Audio Kompressor) decoder
25  * @author Paul B Mahol
26  */
27 
28 #include "libavutil/internal.h"
29 #include "libavutil/mem_internal.h"
30 #include "libavutil/samplefmt.h"
31 
32 #define BITSTREAM_READER_LE
33 #include "audiodsp.h"
34 #include "thread.h"
35 #include "avcodec.h"
36 #include "internal.h"
37 #include "unary.h"
38 #include "tak.h"
39 #include "takdsp.h"
40 
41 #define MAX_SUBFRAMES     8                         ///< max number of subframes per channel
42 #define MAX_PREDICTORS  256
43 
44 typedef struct MCDParam {
45     int8_t present;                                 ///< decorrelation parameter availability for this channel
46     int8_t index;                                   ///< index into array of decorrelation types
47     int8_t chan1;
48     int8_t chan2;
49 } MCDParam;
50 
51 typedef struct TAKDecContext {
52     AVCodecContext *avctx;                          ///< parent AVCodecContext
53     AudioDSPContext adsp;
54     TAKDSPContext   tdsp;
55     TAKStreamInfo   ti;
56     GetBitContext   gb;                             ///< bitstream reader initialized to start at the current frame
57 
58     int             uval;
59     int             nb_samples;                     ///< number of samples in the current frame
60     uint8_t        *decode_buffer;
61     unsigned int    decode_buffer_size;
62     int32_t        *decoded[TAK_MAX_CHANNELS];      ///< decoded samples for each channel
63 
64     int8_t          lpc_mode[TAK_MAX_CHANNELS];
65     int8_t          sample_shift[TAK_MAX_CHANNELS]; ///< shift applied to every sample in the channel
66     int16_t         predictors[MAX_PREDICTORS];
67     int             nb_subframes;                   ///< number of subframes in the current frame
68     int16_t         subframe_len[MAX_SUBFRAMES];    ///< subframe length in samples
69     int             subframe_scale;
70 
71     int8_t          dmode;                          ///< channel decorrelation type in the current frame
72 
73     MCDParam        mcdparams[TAK_MAX_CHANNELS];    ///< multichannel decorrelation parameters
74 
75     int8_t          coding_mode[128];
76     DECLARE_ALIGNED(16, int16_t, filter)[MAX_PREDICTORS];
77     DECLARE_ALIGNED(16, int16_t, residues)[544];
78 } TAKDecContext;
79 
80 static const int8_t mc_dmodes[] = { 1, 3, 4, 6, };
81 
82 static const uint16_t predictor_sizes[] = {
83     4, 8, 12, 16, 24, 32, 48, 64, 80, 96, 128, 160, 192, 224, 256, 0,
84 };
85 
86 static const struct CParam {
87     int init;
88     int escape;
89     int scale;
90     int aescape;
91     int bias;
92 } xcodes[50] = {
93     { 0x01, 0x0000001, 0x0000001, 0x0000003, 0x0000008 },
94     { 0x02, 0x0000003, 0x0000001, 0x0000007, 0x0000006 },
95     { 0x03, 0x0000005, 0x0000002, 0x000000E, 0x000000D },
96     { 0x03, 0x0000003, 0x0000003, 0x000000D, 0x0000018 },
97     { 0x04, 0x000000B, 0x0000004, 0x000001C, 0x0000019 },
98     { 0x04, 0x0000006, 0x0000006, 0x000001A, 0x0000030 },
99     { 0x05, 0x0000016, 0x0000008, 0x0000038, 0x0000032 },
100     { 0x05, 0x000000C, 0x000000C, 0x0000034, 0x0000060 },
101     { 0x06, 0x000002C, 0x0000010, 0x0000070, 0x0000064 },
102     { 0x06, 0x0000018, 0x0000018, 0x0000068, 0x00000C0 },
103     { 0x07, 0x0000058, 0x0000020, 0x00000E0, 0x00000C8 },
104     { 0x07, 0x0000030, 0x0000030, 0x00000D0, 0x0000180 },
105     { 0x08, 0x00000B0, 0x0000040, 0x00001C0, 0x0000190 },
106     { 0x08, 0x0000060, 0x0000060, 0x00001A0, 0x0000300 },
107     { 0x09, 0x0000160, 0x0000080, 0x0000380, 0x0000320 },
108     { 0x09, 0x00000C0, 0x00000C0, 0x0000340, 0x0000600 },
109     { 0x0A, 0x00002C0, 0x0000100, 0x0000700, 0x0000640 },
110     { 0x0A, 0x0000180, 0x0000180, 0x0000680, 0x0000C00 },
111     { 0x0B, 0x0000580, 0x0000200, 0x0000E00, 0x0000C80 },
112     { 0x0B, 0x0000300, 0x0000300, 0x0000D00, 0x0001800 },
113     { 0x0C, 0x0000B00, 0x0000400, 0x0001C00, 0x0001900 },
114     { 0x0C, 0x0000600, 0x0000600, 0x0001A00, 0x0003000 },
115     { 0x0D, 0x0001600, 0x0000800, 0x0003800, 0x0003200 },
116     { 0x0D, 0x0000C00, 0x0000C00, 0x0003400, 0x0006000 },
117     { 0x0E, 0x0002C00, 0x0001000, 0x0007000, 0x0006400 },
118     { 0x0E, 0x0001800, 0x0001800, 0x0006800, 0x000C000 },
119     { 0x0F, 0x0005800, 0x0002000, 0x000E000, 0x000C800 },
120     { 0x0F, 0x0003000, 0x0003000, 0x000D000, 0x0018000 },
121     { 0x10, 0x000B000, 0x0004000, 0x001C000, 0x0019000 },
122     { 0x10, 0x0006000, 0x0006000, 0x001A000, 0x0030000 },
123     { 0x11, 0x0016000, 0x0008000, 0x0038000, 0x0032000 },
124     { 0x11, 0x000C000, 0x000C000, 0x0034000, 0x0060000 },
125     { 0x12, 0x002C000, 0x0010000, 0x0070000, 0x0064000 },
126     { 0x12, 0x0018000, 0x0018000, 0x0068000, 0x00C0000 },
127     { 0x13, 0x0058000, 0x0020000, 0x00E0000, 0x00C8000 },
128     { 0x13, 0x0030000, 0x0030000, 0x00D0000, 0x0180000 },
129     { 0x14, 0x00B0000, 0x0040000, 0x01C0000, 0x0190000 },
130     { 0x14, 0x0060000, 0x0060000, 0x01A0000, 0x0300000 },
131     { 0x15, 0x0160000, 0x0080000, 0x0380000, 0x0320000 },
132     { 0x15, 0x00C0000, 0x00C0000, 0x0340000, 0x0600000 },
133     { 0x16, 0x02C0000, 0x0100000, 0x0700000, 0x0640000 },
134     { 0x16, 0x0180000, 0x0180000, 0x0680000, 0x0C00000 },
135     { 0x17, 0x0580000, 0x0200000, 0x0E00000, 0x0C80000 },
136     { 0x17, 0x0300000, 0x0300000, 0x0D00000, 0x1800000 },
137     { 0x18, 0x0B00000, 0x0400000, 0x1C00000, 0x1900000 },
138     { 0x18, 0x0600000, 0x0600000, 0x1A00000, 0x3000000 },
139     { 0x19, 0x1600000, 0x0800000, 0x3800000, 0x3200000 },
140     { 0x19, 0x0C00000, 0x0C00000, 0x3400000, 0x6000000 },
141     { 0x1A, 0x2C00000, 0x1000000, 0x7000000, 0x6400000 },
142     { 0x1A, 0x1800000, 0x1800000, 0x6800000, 0xC000000 },
143 };
144 
set_bps_params(AVCodecContext * avctx)145 static int set_bps_params(AVCodecContext *avctx)
146 {
147     switch (avctx->bits_per_raw_sample) {
148     case 8:
149         avctx->sample_fmt = AV_SAMPLE_FMT_U8P;
150         break;
151     case 16:
152         avctx->sample_fmt = AV_SAMPLE_FMT_S16P;
153         break;
154     case 24:
155         avctx->sample_fmt = AV_SAMPLE_FMT_S32P;
156         break;
157     default:
158         av_log(avctx, AV_LOG_ERROR, "invalid/unsupported bits per sample: %d\n",
159                avctx->bits_per_raw_sample);
160         return AVERROR_INVALIDDATA;
161     }
162 
163     return 0;
164 }
165 
set_sample_rate_params(AVCodecContext * avctx)166 static void set_sample_rate_params(AVCodecContext *avctx)
167 {
168     TAKDecContext *s  = avctx->priv_data;
169     int shift;
170 
171     if (avctx->sample_rate < 11025) {
172         shift = 3;
173     } else if (avctx->sample_rate < 22050) {
174         shift = 2;
175     } else if (avctx->sample_rate < 44100) {
176         shift = 1;
177     } else {
178         shift = 0;
179     }
180     s->uval           = FFALIGN(avctx->sample_rate + 511LL >> 9, 4) << shift;
181     s->subframe_scale = FFALIGN(avctx->sample_rate + 511LL >> 9, 4) << 1;
182 }
183 
tak_decode_init(AVCodecContext * avctx)184 static av_cold int tak_decode_init(AVCodecContext *avctx)
185 {
186     TAKDecContext *s = avctx->priv_data;
187 
188     ff_audiodsp_init(&s->adsp);
189     ff_takdsp_init(&s->tdsp);
190 
191     s->avctx = avctx;
192     avctx->bits_per_raw_sample = avctx->bits_per_coded_sample;
193 
194     set_sample_rate_params(avctx);
195 
196     return set_bps_params(avctx);
197 }
198 
decode_lpc(int32_t * coeffs,int mode,int length)199 static void decode_lpc(int32_t *coeffs, int mode, int length)
200 {
201     int i;
202 
203     if (length < 2)
204         return;
205 
206     if (mode == 1) {
207         unsigned a1 = *coeffs++;
208         for (i = 0; i < length - 1 >> 1; i++) {
209             *coeffs   += a1;
210             coeffs[1] += (unsigned)*coeffs;
211             a1         = coeffs[1];
212             coeffs    += 2;
213         }
214         if (length - 1 & 1)
215             *coeffs += a1;
216     } else if (mode == 2) {
217         unsigned a1    = coeffs[1];
218         unsigned a2    = a1 + *coeffs;
219         coeffs[1] = a2;
220         if (length > 2) {
221             coeffs += 2;
222             for (i = 0; i < length - 2 >> 1; i++) {
223                 unsigned a3    = *coeffs + a1;
224                 unsigned a4    = a3 + a2;
225                 *coeffs   = a4;
226                 a1        = coeffs[1] + a3;
227                 a2        = a1 + a4;
228                 coeffs[1] = a2;
229                 coeffs   += 2;
230             }
231             if (length & 1)
232                 *coeffs += a1 + a2;
233         }
234     } else if (mode == 3) {
235         unsigned a1    = coeffs[1];
236         unsigned a2    = a1 + *coeffs;
237         coeffs[1] = a2;
238         if (length > 2) {
239             unsigned a3  = coeffs[2];
240             unsigned a4  = a3 + a1;
241             unsigned a5  = a4 + a2;
242             coeffs[2] = a5;
243             coeffs += 3;
244             for (i = 0; i < length - 3; i++) {
245                 a3     += *coeffs;
246                 a4     += a3;
247                 a5     += a4;
248                 *coeffs = a5;
249                 coeffs++;
250             }
251         }
252     }
253 }
254 
decode_segment(TAKDecContext * s,int8_t mode,int32_t * decoded,int len)255 static int decode_segment(TAKDecContext *s, int8_t mode, int32_t *decoded, int len)
256 {
257     struct CParam code;
258     GetBitContext *gb = &s->gb;
259     int i;
260 
261     if (!mode) {
262         memset(decoded, 0, len * sizeof(*decoded));
263         return 0;
264     }
265 
266     if (mode > FF_ARRAY_ELEMS(xcodes))
267         return AVERROR_INVALIDDATA;
268     code = xcodes[mode - 1];
269 
270     for (i = 0; i < len; i++) {
271         unsigned x = get_bits_long(gb, code.init);
272         if (x >= code.escape && get_bits1(gb)) {
273             x |= 1 << code.init;
274             if (x >= code.aescape) {
275                 unsigned scale = get_unary(gb, 1, 9);
276                 if (scale == 9) {
277                     int scale_bits = get_bits(gb, 3);
278                     if (scale_bits > 0) {
279                         if (scale_bits == 7) {
280                             scale_bits += get_bits(gb, 5);
281                             if (scale_bits > 29)
282                                 return AVERROR_INVALIDDATA;
283                         }
284                         scale = get_bits_long(gb, scale_bits) + 1;
285                         x    += code.scale * scale;
286                     }
287                     x += code.bias;
288                 } else
289                     x += code.scale * scale - code.escape;
290             } else
291                 x -= code.escape;
292         }
293         decoded[i] = (x >> 1) ^ -(x & 1);
294     }
295 
296     return 0;
297 }
298 
decode_residues(TAKDecContext * s,int32_t * decoded,int length)299 static int decode_residues(TAKDecContext *s, int32_t *decoded, int length)
300 {
301     GetBitContext *gb = &s->gb;
302     int i, mode, ret;
303 
304     if (length > s->nb_samples)
305         return AVERROR_INVALIDDATA;
306 
307     if (get_bits1(gb)) {
308         int wlength, rval;
309 
310         wlength = length / s->uval;
311 
312         rval = length - (wlength * s->uval);
313 
314         if (rval < s->uval / 2)
315             rval += s->uval;
316         else
317             wlength++;
318 
319         if (wlength <= 1 || wlength > 128)
320             return AVERROR_INVALIDDATA;
321 
322         s->coding_mode[0] = mode = get_bits(gb, 6);
323 
324         for (i = 1; i < wlength; i++) {
325             int c = get_unary(gb, 1, 6);
326 
327             switch (c) {
328             case 6:
329                 mode = get_bits(gb, 6);
330                 break;
331             case 5:
332             case 4:
333             case 3: {
334                 /* mode += sign ? (1 - c) : (c - 1) */
335                 int sign = get_bits1(gb);
336                 mode    += (-sign ^ (c - 1)) + sign;
337                 break;
338             }
339             case 2:
340                 mode++;
341                 break;
342             case 1:
343                 mode--;
344                 break;
345             }
346             s->coding_mode[i] = mode;
347         }
348 
349         i = 0;
350         while (i < wlength) {
351             int len = 0;
352 
353             mode = s->coding_mode[i];
354             do {
355                 if (i >= wlength - 1)
356                     len += rval;
357                 else
358                     len += s->uval;
359                 i++;
360 
361                 if (i == wlength)
362                     break;
363             } while (s->coding_mode[i] == mode);
364 
365             if ((ret = decode_segment(s, mode, decoded, len)) < 0)
366                 return ret;
367             decoded += len;
368         }
369     } else {
370         mode = get_bits(gb, 6);
371         if ((ret = decode_segment(s, mode, decoded, length)) < 0)
372             return ret;
373     }
374 
375     return 0;
376 }
377 
get_bits_esc4(GetBitContext * gb)378 static int get_bits_esc4(GetBitContext *gb)
379 {
380     if (get_bits1(gb))
381         return get_bits(gb, 4) + 1;
382     else
383         return 0;
384 }
385 
decode_subframe(TAKDecContext * s,int32_t * decoded,int subframe_size,int prev_subframe_size)386 static int decode_subframe(TAKDecContext *s, int32_t *decoded,
387                            int subframe_size, int prev_subframe_size)
388 {
389     GetBitContext *gb = &s->gb;
390     int x, y, i, j, ret = 0;
391     int dshift, size, filter_quant, filter_order;
392     int tfilter[MAX_PREDICTORS];
393 
394     if (!get_bits1(gb))
395         return decode_residues(s, decoded, subframe_size);
396 
397     filter_order = predictor_sizes[get_bits(gb, 4)];
398 
399     if (prev_subframe_size > 0 && get_bits1(gb)) {
400         if (filter_order > prev_subframe_size)
401             return AVERROR_INVALIDDATA;
402 
403         decoded       -= filter_order;
404         subframe_size += filter_order;
405 
406         if (filter_order > subframe_size)
407             return AVERROR_INVALIDDATA;
408     } else {
409         int lpc_mode;
410 
411         if (filter_order > subframe_size)
412             return AVERROR_INVALIDDATA;
413 
414         lpc_mode = get_bits(gb, 2);
415         if (lpc_mode > 2)
416             return AVERROR_INVALIDDATA;
417 
418         if ((ret = decode_residues(s, decoded, filter_order)) < 0)
419             return ret;
420 
421         if (lpc_mode)
422             decode_lpc(decoded, lpc_mode, filter_order);
423     }
424 
425     dshift = get_bits_esc4(gb);
426     size   = get_bits1(gb) + 6;
427 
428     filter_quant = 10;
429     if (get_bits1(gb)) {
430         filter_quant -= get_bits(gb, 3) + 1;
431         if (filter_quant < 3)
432             return AVERROR_INVALIDDATA;
433     }
434 
435     s->predictors[0] = get_sbits(gb, 10);
436     s->predictors[1] = get_sbits(gb, 10);
437     s->predictors[2] = get_sbits(gb, size) * (1 << (10 - size));
438     s->predictors[3] = get_sbits(gb, size) * (1 << (10 - size));
439     if (filter_order > 4) {
440         int tmp = size - get_bits1(gb);
441 
442         for (i = 4; i < filter_order; i++) {
443             if (!(i & 3))
444                 x = tmp - get_bits(gb, 2);
445             s->predictors[i] = get_sbits(gb, x) * (1 << (10 - size));
446         }
447     }
448 
449     tfilter[0] = s->predictors[0] * 64;
450     for (i = 1; i < filter_order; i++) {
451         uint32_t *p1 = &tfilter[0];
452         uint32_t *p2 = &tfilter[i - 1];
453 
454         for (j = 0; j < (i + 1) / 2; j++) {
455             x     = *p1 + ((int32_t)(s->predictors[i] * *p2 + 256) >> 9);
456             *p2  += (int32_t)(s->predictors[i] * *p1 + 256) >> 9;
457             *p1++ = x;
458             p2--;
459         }
460 
461         tfilter[i] = s->predictors[i] * 64;
462     }
463 
464     x = 1 << (32 - (15 - filter_quant));
465     y = 1 << ((15 - filter_quant) - 1);
466     for (i = 0, j = filter_order - 1; i < filter_order / 2; i++, j--) {
467         s->filter[j] = x - ((tfilter[i] + y) >> (15 - filter_quant));
468         s->filter[i] = x - ((tfilter[j] + y) >> (15 - filter_quant));
469     }
470 
471     if ((ret = decode_residues(s, &decoded[filter_order],
472                                subframe_size - filter_order)) < 0)
473         return ret;
474 
475     for (i = 0; i < filter_order; i++)
476         s->residues[i] = *decoded++ >> dshift;
477 
478     y    = FF_ARRAY_ELEMS(s->residues) - filter_order;
479     x    = subframe_size - filter_order;
480     while (x > 0) {
481         int tmp = FFMIN(y, x);
482 
483         for (i = 0; i < tmp; i++) {
484             int v = 1 << (filter_quant - 1);
485 
486             if (filter_order & -16)
487                 v += (unsigned)s->adsp.scalarproduct_int16(&s->residues[i], s->filter,
488                                                  filter_order & -16);
489             for (j = filter_order & -16; j < filter_order; j += 4) {
490                 v += s->residues[i + j + 3] * (unsigned)s->filter[j + 3] +
491                      s->residues[i + j + 2] * (unsigned)s->filter[j + 2] +
492                      s->residues[i + j + 1] * (unsigned)s->filter[j + 1] +
493                      s->residues[i + j    ] * (unsigned)s->filter[j    ];
494             }
495             v = (av_clip_intp2(v >> filter_quant, 13) * (1 << dshift)) - (unsigned)*decoded;
496             *decoded++ = v;
497             s->residues[filter_order + i] = v >> dshift;
498         }
499 
500         x -= tmp;
501         if (x > 0)
502             memcpy(s->residues, &s->residues[y], 2 * filter_order);
503     }
504 
505     emms_c();
506 
507     return 0;
508 }
509 
decode_channel(TAKDecContext * s,int chan)510 static int decode_channel(TAKDecContext *s, int chan)
511 {
512     AVCodecContext *avctx = s->avctx;
513     GetBitContext *gb     = &s->gb;
514     int32_t *decoded      = s->decoded[chan];
515     int left              = s->nb_samples - 1;
516     int i = 0, ret, prev = 0;
517 
518     s->sample_shift[chan] = get_bits_esc4(gb);
519     if (s->sample_shift[chan] >= avctx->bits_per_raw_sample)
520         return AVERROR_INVALIDDATA;
521 
522     *decoded++ = get_sbits(gb, avctx->bits_per_raw_sample - s->sample_shift[chan]);
523     s->lpc_mode[chan] = get_bits(gb, 2);
524     s->nb_subframes   = get_bits(gb, 3) + 1;
525 
526     if (s->nb_subframes > 1) {
527         if (get_bits_left(gb) < (s->nb_subframes - 1) * 6)
528             return AVERROR_INVALIDDATA;
529 
530         for (; i < s->nb_subframes - 1; i++) {
531             int v = get_bits(gb, 6);
532 
533             s->subframe_len[i] = (v - prev) * s->subframe_scale;
534             if (s->subframe_len[i] <= 0)
535                 return AVERROR_INVALIDDATA;
536 
537             left -= s->subframe_len[i];
538             prev  = v;
539         }
540 
541         if (left <= 0)
542             return AVERROR_INVALIDDATA;
543     }
544     s->subframe_len[i] = left;
545 
546     prev = 0;
547     for (i = 0; i < s->nb_subframes; i++) {
548         if ((ret = decode_subframe(s, decoded, s->subframe_len[i], prev)) < 0)
549             return ret;
550         decoded += s->subframe_len[i];
551         prev     = s->subframe_len[i];
552     }
553 
554     return 0;
555 }
556 
decorrelate(TAKDecContext * s,int c1,int c2,int length)557 static int decorrelate(TAKDecContext *s, int c1, int c2, int length)
558 {
559     GetBitContext *gb = &s->gb;
560     int32_t *p1       = s->decoded[c1] + (s->dmode > 5);
561     int32_t *p2       = s->decoded[c2] + (s->dmode > 5);
562     int32_t bp1       = p1[0];
563     int32_t bp2       = p2[0];
564     int i;
565     int dshift, dfactor;
566 
567     length += s->dmode < 6;
568 
569     switch (s->dmode) {
570     case 1: /* left/side */
571         s->tdsp.decorrelate_ls(p1, p2, length);
572         break;
573     case 2: /* side/right */
574         s->tdsp.decorrelate_sr(p1, p2, length);
575         break;
576     case 3: /* side/mid */
577         s->tdsp.decorrelate_sm(p1, p2, length);
578         break;
579     case 4: /* side/left with scale factor */
580         FFSWAP(int32_t*, p1, p2);
581         FFSWAP(int32_t, bp1, bp2);
582     case 5: /* side/right with scale factor */
583         dshift  = get_bits_esc4(gb);
584         dfactor = get_sbits(gb, 10);
585         s->tdsp.decorrelate_sf(p1, p2, length, dshift, dfactor);
586         break;
587     case 6:
588         FFSWAP(int32_t*, p1, p2);
589     case 7: {
590         int length2, order_half, filter_order, dval1, dval2;
591         int tmp, x, code_size;
592 
593         if (length < 256)
594             return AVERROR_INVALIDDATA;
595 
596         dshift       = get_bits_esc4(gb);
597         filter_order = 8 << get_bits1(gb);
598         dval1        = get_bits1(gb);
599         dval2        = get_bits1(gb);
600 
601         for (i = 0; i < filter_order; i++) {
602             if (!(i & 3))
603                 code_size = 14 - get_bits(gb, 3);
604             s->filter[i] = get_sbits(gb, code_size);
605         }
606 
607         order_half = filter_order / 2;
608         length2    = length - (filter_order - 1);
609 
610         /* decorrelate beginning samples */
611         if (dval1) {
612             for (i = 0; i < order_half; i++) {
613                 int32_t a = p1[i];
614                 int32_t b = p2[i];
615                 p1[i]     = a + b;
616             }
617         }
618 
619         /* decorrelate ending samples */
620         if (dval2) {
621             for (i = length2 + order_half; i < length; i++) {
622                 int32_t a = p1[i];
623                 int32_t b = p2[i];
624                 p1[i]     = a + b;
625             }
626         }
627 
628 
629         for (i = 0; i < filter_order; i++)
630             s->residues[i] = *p2++ >> dshift;
631 
632         p1 += order_half;
633         x = FF_ARRAY_ELEMS(s->residues) - filter_order;
634         for (; length2 > 0; length2 -= tmp) {
635             tmp = FFMIN(length2, x);
636 
637             for (i = 0; i < tmp - (tmp == length2); i++)
638                 s->residues[filter_order + i] = *p2++ >> dshift;
639 
640             for (i = 0; i < tmp; i++) {
641                 int v = 1 << 9;
642 
643                 if (filter_order == 16) {
644                     v += s->adsp.scalarproduct_int16(&s->residues[i], s->filter,
645                                                      filter_order);
646                 } else {
647                     v += s->residues[i + 7] * s->filter[7] +
648                          s->residues[i + 6] * s->filter[6] +
649                          s->residues[i + 5] * s->filter[5] +
650                          s->residues[i + 4] * s->filter[4] +
651                          s->residues[i + 3] * s->filter[3] +
652                          s->residues[i + 2] * s->filter[2] +
653                          s->residues[i + 1] * s->filter[1] +
654                          s->residues[i    ] * s->filter[0];
655                 }
656 
657                 v = av_clip_intp2(v >> 10, 13) * (1U << dshift) - *p1;
658                 *p1++ = v;
659             }
660 
661             memmove(s->residues, &s->residues[tmp], 2 * filter_order);
662         }
663 
664         emms_c();
665         break;
666     }
667     }
668 
669     if (s->dmode > 0 && s->dmode < 6) {
670         p1[0] = bp1;
671         p2[0] = bp2;
672     }
673 
674     return 0;
675 }
676 
tak_decode_frame(AVCodecContext * avctx,void * data,int * got_frame_ptr,AVPacket * pkt)677 static int tak_decode_frame(AVCodecContext *avctx, void *data,
678                             int *got_frame_ptr, AVPacket *pkt)
679 {
680     TAKDecContext *s  = avctx->priv_data;
681     AVFrame *frame    = data;
682     ThreadFrame tframe = { .f = data };
683     GetBitContext *gb = &s->gb;
684     int chan, i, ret, hsize;
685 
686     if (pkt->size < TAK_MIN_FRAME_HEADER_BYTES)
687         return AVERROR_INVALIDDATA;
688 
689     if ((ret = init_get_bits8(gb, pkt->data, pkt->size)) < 0)
690         return ret;
691 
692     if ((ret = ff_tak_decode_frame_header(avctx, gb, &s->ti, 0)) < 0)
693         return ret;
694 
695     hsize = get_bits_count(gb) / 8;
696     if (avctx->err_recognition & (AV_EF_CRCCHECK|AV_EF_COMPLIANT)) {
697         if (ff_tak_check_crc(pkt->data, hsize)) {
698             av_log(avctx, AV_LOG_ERROR, "CRC error\n");
699             if (avctx->err_recognition & AV_EF_EXPLODE)
700                 return AVERROR_INVALIDDATA;
701         }
702     }
703 
704     if (s->ti.codec != TAK_CODEC_MONO_STEREO &&
705         s->ti.codec != TAK_CODEC_MULTICHANNEL) {
706         avpriv_report_missing_feature(avctx, "TAK codec type %d", s->ti.codec);
707         return AVERROR_PATCHWELCOME;
708     }
709     if (s->ti.data_type) {
710         av_log(avctx, AV_LOG_ERROR,
711                "unsupported data type: %d\n", s->ti.data_type);
712         return AVERROR_INVALIDDATA;
713     }
714     if (s->ti.codec == TAK_CODEC_MONO_STEREO && s->ti.channels > 2) {
715         av_log(avctx, AV_LOG_ERROR,
716                "invalid number of channels: %d\n", s->ti.channels);
717         return AVERROR_INVALIDDATA;
718     }
719     if (s->ti.channels > 6) {
720         av_log(avctx, AV_LOG_ERROR,
721                "unsupported number of channels: %d\n", s->ti.channels);
722         return AVERROR_INVALIDDATA;
723     }
724 
725     if (s->ti.frame_samples <= 0) {
726         av_log(avctx, AV_LOG_ERROR, "unsupported/invalid number of samples\n");
727         return AVERROR_INVALIDDATA;
728     }
729 
730     avctx->bits_per_raw_sample = s->ti.bps;
731     if ((ret = set_bps_params(avctx)) < 0)
732         return ret;
733     if (s->ti.sample_rate != avctx->sample_rate) {
734         avctx->sample_rate = s->ti.sample_rate;
735         set_sample_rate_params(avctx);
736     }
737     if (s->ti.ch_layout)
738         avctx->channel_layout = s->ti.ch_layout;
739     avctx->channels = s->ti.channels;
740 
741     s->nb_samples = s->ti.last_frame_samples ? s->ti.last_frame_samples
742                                              : s->ti.frame_samples;
743 
744     frame->nb_samples = s->nb_samples;
745     if ((ret = ff_thread_get_buffer(avctx, &tframe, 0)) < 0)
746         return ret;
747     ff_thread_finish_setup(avctx);
748 
749     if (avctx->bits_per_raw_sample <= 16) {
750         int buf_size = av_samples_get_buffer_size(NULL, avctx->channels,
751                                                   s->nb_samples,
752                                                   AV_SAMPLE_FMT_S32P, 0);
753         if (buf_size < 0)
754             return buf_size;
755         av_fast_malloc(&s->decode_buffer, &s->decode_buffer_size, buf_size);
756         if (!s->decode_buffer)
757             return AVERROR(ENOMEM);
758         ret = av_samples_fill_arrays((uint8_t **)s->decoded, NULL,
759                                      s->decode_buffer, avctx->channels,
760                                      s->nb_samples, AV_SAMPLE_FMT_S32P, 0);
761         if (ret < 0)
762             return ret;
763     } else {
764         for (chan = 0; chan < avctx->channels; chan++)
765             s->decoded[chan] = (int32_t *)frame->extended_data[chan];
766     }
767 
768     if (s->nb_samples < 16) {
769         for (chan = 0; chan < avctx->channels; chan++) {
770             int32_t *decoded = s->decoded[chan];
771             for (i = 0; i < s->nb_samples; i++)
772                 decoded[i] = get_sbits(gb, avctx->bits_per_raw_sample);
773         }
774     } else {
775         if (s->ti.codec == TAK_CODEC_MONO_STEREO) {
776             for (chan = 0; chan < avctx->channels; chan++)
777                 if (ret = decode_channel(s, chan))
778                     return ret;
779 
780             if (avctx->channels == 2) {
781                 s->nb_subframes = get_bits(gb, 1) + 1;
782                 if (s->nb_subframes > 1) {
783                     s->subframe_len[1] = get_bits(gb, 6);
784                 }
785 
786                 s->dmode = get_bits(gb, 3);
787                 if (ret = decorrelate(s, 0, 1, s->nb_samples - 1))
788                     return ret;
789             }
790         } else if (s->ti.codec == TAK_CODEC_MULTICHANNEL) {
791             if (get_bits1(gb)) {
792                 int ch_mask = 0;
793 
794                 chan = get_bits(gb, 4) + 1;
795                 if (chan > avctx->channels)
796                     return AVERROR_INVALIDDATA;
797 
798                 for (i = 0; i < chan; i++) {
799                     int nbit = get_bits(gb, 4);
800 
801                     if (nbit >= avctx->channels)
802                         return AVERROR_INVALIDDATA;
803 
804                     if (ch_mask & 1 << nbit)
805                         return AVERROR_INVALIDDATA;
806 
807                     s->mcdparams[i].present = get_bits1(gb);
808                     if (s->mcdparams[i].present) {
809                         s->mcdparams[i].index = get_bits(gb, 2);
810                         s->mcdparams[i].chan2 = get_bits(gb, 4);
811                         if (s->mcdparams[i].chan2 >= avctx->channels) {
812                             av_log(avctx, AV_LOG_ERROR,
813                                    "invalid channel 2 (%d) for %d channel(s)\n",
814                                    s->mcdparams[i].chan2, avctx->channels);
815                             return AVERROR_INVALIDDATA;
816                         }
817                         if (s->mcdparams[i].index == 1) {
818                             if ((nbit == s->mcdparams[i].chan2) ||
819                                 (ch_mask & 1 << s->mcdparams[i].chan2))
820                                 return AVERROR_INVALIDDATA;
821 
822                             ch_mask |= 1 << s->mcdparams[i].chan2;
823                         } else if (!(ch_mask & 1 << s->mcdparams[i].chan2)) {
824                             return AVERROR_INVALIDDATA;
825                         }
826                     }
827                     s->mcdparams[i].chan1 = nbit;
828 
829                     ch_mask |= 1 << nbit;
830                 }
831             } else {
832                 chan = avctx->channels;
833                 for (i = 0; i < chan; i++) {
834                     s->mcdparams[i].present = 0;
835                     s->mcdparams[i].chan1   = i;
836                 }
837             }
838 
839             for (i = 0; i < chan; i++) {
840                 if (s->mcdparams[i].present && s->mcdparams[i].index == 1)
841                     if (ret = decode_channel(s, s->mcdparams[i].chan2))
842                         return ret;
843 
844                 if (ret = decode_channel(s, s->mcdparams[i].chan1))
845                     return ret;
846 
847                 if (s->mcdparams[i].present) {
848                     s->dmode = mc_dmodes[s->mcdparams[i].index];
849                     if (ret = decorrelate(s,
850                                           s->mcdparams[i].chan2,
851                                           s->mcdparams[i].chan1,
852                                           s->nb_samples - 1))
853                         return ret;
854                 }
855             }
856         }
857 
858         for (chan = 0; chan < avctx->channels; chan++) {
859             int32_t *decoded = s->decoded[chan];
860 
861             if (s->lpc_mode[chan])
862                 decode_lpc(decoded, s->lpc_mode[chan], s->nb_samples);
863 
864             if (s->sample_shift[chan] > 0)
865                 for (i = 0; i < s->nb_samples; i++)
866                     decoded[i] *= 1U << s->sample_shift[chan];
867         }
868     }
869 
870     align_get_bits(gb);
871     skip_bits(gb, 24);
872     if (get_bits_left(gb) < 0)
873         av_log(avctx, AV_LOG_DEBUG, "overread\n");
874     else if (get_bits_left(gb) > 0)
875         av_log(avctx, AV_LOG_DEBUG, "underread\n");
876 
877     if (avctx->err_recognition & (AV_EF_CRCCHECK | AV_EF_COMPLIANT)) {
878         if (ff_tak_check_crc(pkt->data + hsize,
879                              get_bits_count(gb) / 8 - hsize)) {
880             av_log(avctx, AV_LOG_ERROR, "CRC error\n");
881             if (avctx->err_recognition & AV_EF_EXPLODE)
882                 return AVERROR_INVALIDDATA;
883         }
884     }
885 
886     /* convert to output buffer */
887     switch (avctx->sample_fmt) {
888     case AV_SAMPLE_FMT_U8P:
889         for (chan = 0; chan < avctx->channels; chan++) {
890             uint8_t *samples = (uint8_t *)frame->extended_data[chan];
891             int32_t *decoded = s->decoded[chan];
892             for (i = 0; i < s->nb_samples; i++)
893                 samples[i] = decoded[i] + 0x80U;
894         }
895         break;
896     case AV_SAMPLE_FMT_S16P:
897         for (chan = 0; chan < avctx->channels; chan++) {
898             int16_t *samples = (int16_t *)frame->extended_data[chan];
899             int32_t *decoded = s->decoded[chan];
900             for (i = 0; i < s->nb_samples; i++)
901                 samples[i] = decoded[i];
902         }
903         break;
904     case AV_SAMPLE_FMT_S32P:
905         for (chan = 0; chan < avctx->channels; chan++) {
906             int32_t *samples = (int32_t *)frame->extended_data[chan];
907             for (i = 0; i < s->nb_samples; i++)
908                 samples[i] *= 1U << 8;
909         }
910         break;
911     }
912 
913     *got_frame_ptr = 1;
914 
915     return pkt->size;
916 }
917 
918 #if HAVE_THREADS
update_thread_context(AVCodecContext * dst,const AVCodecContext * src)919 static int update_thread_context(AVCodecContext *dst,
920                                  const AVCodecContext *src)
921 {
922     TAKDecContext *tsrc = src->priv_data;
923     TAKDecContext *tdst = dst->priv_data;
924 
925     if (dst == src)
926         return 0;
927     memcpy(&tdst->ti, &tsrc->ti, sizeof(TAKStreamInfo));
928     return 0;
929 }
930 #endif
931 
tak_decode_close(AVCodecContext * avctx)932 static av_cold int tak_decode_close(AVCodecContext *avctx)
933 {
934     TAKDecContext *s = avctx->priv_data;
935 
936     av_freep(&s->decode_buffer);
937 
938     return 0;
939 }
940 
941 AVCodec ff_tak_decoder = {
942     .name             = "tak",
943     .long_name        = NULL_IF_CONFIG_SMALL("TAK (Tom's lossless Audio Kompressor)"),
944     .type             = AVMEDIA_TYPE_AUDIO,
945     .id               = AV_CODEC_ID_TAK,
946     .priv_data_size   = sizeof(TAKDecContext),
947     .init             = tak_decode_init,
948     .close            = tak_decode_close,
949     .decode           = tak_decode_frame,
950     .update_thread_context = ONLY_IF_THREADS_ENABLED(update_thread_context),
951     .capabilities     = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS | AV_CODEC_CAP_CHANNEL_CONF,
952     .sample_fmts      = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_U8P,
953                                                         AV_SAMPLE_FMT_S16P,
954                                                         AV_SAMPLE_FMT_S32P,
955                                                         AV_SAMPLE_FMT_NONE },
956 };
957