3 * Copyright (c) 2018 Rostislav Pehlivanov <atomnuker@gmail.com>
5 * This file is part of FFmpeg.
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.
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.
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
25 #include "atrac9tab.h"
26 #include "libavutil/lfg.h"
27 #include "libavutil/float_dsp.h"
29 typedef struct ATRAC9ChannelData {
33 int32_t scalefactors[31];
34 int32_t scalefactors_prev[31];
36 int precision_coarse[30];
37 int precision_fine[30];
38 int precision_mask[30];
42 int32_t q_coeffs_coarse[256];
43 int32_t q_coeffs_fine[256];
45 DECLARE_ALIGNED(32, float, coeffs )[256];
46 DECLARE_ALIGNED(32, float, prev_win)[128];
49 typedef struct ATRAC9BlockData {
50 ATRAC9ChannelData channel[2];
57 /* Stereo block only */
60 /* Band extension only */
62 int has_band_ext_data;
76 typedef struct ATRAC9Context {
77 AVCodecContext *avctx;
78 AVFloatDSPContext *fdsp;
80 ATRAC9BlockData block[5];
88 const ATRAC9BlockConfig *block_config;
90 /* Generated on init */
91 VLC sf_vlc[2][8]; /* Signed/unsigned, length */
92 VLC coeff_vlc[2][8][4]; /* Cookbook, precision, cookbook index */
93 uint8_t alloc_curve[48][48];
94 DECLARE_ALIGNED(32, float, imdct_win)[256];
96 DECLARE_ALIGNED(32, float, temp)[256];
99 static inline int parse_gradient(ATRAC9Context *s, ATRAC9BlockData *b,
104 int values, sign, base;
108 b->grad_mode = get_bits(gb, 2);
110 grad_range[0] = get_bits(gb, 5);
112 grad_value[0] = get_bits(gb, 5);
115 grad_range[0] = get_bits(gb, 6);
116 grad_range[1] = get_bits(gb, 6) + 1;
117 grad_value[0] = get_bits(gb, 5);
118 grad_value[1] = get_bits(gb, 5);
120 b->grad_boundary = get_bits(gb, 4);
122 if (grad_range[0] >= grad_range[1] || grad_range[1] > 47)
123 return AVERROR_INVALIDDATA;
125 if (grad_value[0] > 31 || grad_value[1] > 31)
126 return AVERROR_INVALIDDATA;
128 if (b->grad_boundary > b->q_unit_cnt)
129 return AVERROR_INVALIDDATA;
131 values = grad_value[1] - grad_value[0];
132 sign = 1 - 2*(values < 0);
133 base = grad_value[0] + sign;
134 scale = (FFABS(values) - 1) / 31.0f;
135 curve = s->alloc_curve[grad_range[1] - grad_range[0] - 1];
137 for (int i = 0; i <= b->q_unit_cnt; i++)
138 b->gradient[i] = grad_value[i >= grad_range[0]];
140 for (int i = grad_range[0]; i < grad_range[1]; i++)
141 b->gradient[i] = base + sign*((int)(scale*curve[i - grad_range[0]]));
146 static inline void calc_precision(ATRAC9Context *s, ATRAC9BlockData *b,
147 ATRAC9ChannelData *c)
149 memset(c->precision_mask, 0, sizeof(c->precision_mask));
150 for (int i = 1; i < b->q_unit_cnt; i++) {
151 const int delta = FFABS(c->scalefactors[i] - c->scalefactors[i - 1]) - 1;
153 const int neg = c->scalefactors[i - 1] > c->scalefactors[i];
154 c->precision_mask[i - neg] += FFMIN(delta, 5);
159 for (int i = 0; i < b->q_unit_cnt; i++) {
160 c->precision_coarse[i] = c->scalefactors[i];
161 c->precision_coarse[i] += c->precision_mask[i] - b->gradient[i];
162 if (c->precision_coarse[i] < 0)
164 switch (b->grad_mode) {
166 c->precision_coarse[i] >>= 1;
169 c->precision_coarse[i] = (3 * c->precision_coarse[i]) >> 3;
172 c->precision_coarse[i] >>= 2;
177 for (int i = 0; i < b->q_unit_cnt; i++)
178 c->precision_coarse[i] = c->scalefactors[i] - b->gradient[i];
182 for (int i = 0; i < b->q_unit_cnt; i++)
183 c->precision_coarse[i] = FFMAX(c->precision_coarse[i], 1);
185 for (int i = 0; i < b->grad_boundary; i++)
186 c->precision_coarse[i]++;
188 for (int i = 0; i < b->q_unit_cnt; i++) {
189 c->precision_fine[i] = 0;
190 if (c->precision_coarse[i] > 15) {
191 c->precision_fine[i] = c->precision_coarse[i] - 15;
192 c->precision_coarse[i] = 15;
197 static inline int parse_band_ext(ATRAC9Context *s, ATRAC9BlockData *b,
198 GetBitContext *gb, int stereo)
202 if (b->has_band_ext) {
203 ext_band = at9_tab_band_ext_group[b->q_unit_cnt - 13][2];
205 b->channel[1].band_ext = get_bits(gb, 2);
206 b->channel[1].band_ext = ext_band > 2 ? b->channel[1].band_ext : 4;
212 b->has_band_ext_data = get_bits1(gb);
213 if (!b->has_band_ext_data)
216 if (!b->has_band_ext) {
218 skip_bits_long(gb, get_bits(gb, 5));
222 b->channel[0].band_ext = get_bits(gb, 2);
223 b->channel[0].band_ext = ext_band > 2 ? b->channel[0].band_ext : 4;
225 if (!get_bits(gb, 5))
228 for (int i = 0; i <= stereo; i++) {
229 ATRAC9ChannelData *c = &b->channel[i];
230 const int count = at9_tab_band_ext_cnt[c->band_ext][ext_band];
231 for (int j = 0; j < count; j++) {
232 int len = at9_tab_band_ext_lengths[c->band_ext][ext_band][j];
233 c->band_ext_data[j] = get_bits(gb, len);
240 static inline int read_scalefactors(ATRAC9Context *s, ATRAC9BlockData *b,
241 ATRAC9ChannelData *c, GetBitContext *gb,
242 int channel_idx, int first_in_pkt)
244 static const int mode_map[2][4] = { { 0, 1, 2, 3 }, { 0, 2, 3, 4 } };
245 const int mode = mode_map[channel_idx][get_bits(gb, 2)];
247 memset(c->scalefactors, 0, sizeof(c->scalefactors));
249 if (first_in_pkt && (mode == 4 || ((mode == 3) && !channel_idx))) {
250 av_log(s->avctx, AV_LOG_ERROR, "Invalid scalefactor coding mode!\n");
251 return AVERROR_INVALIDDATA;
255 case 0: { /* VLC delta offset */
256 const uint8_t *sf_weights = at9_tab_sf_weights[get_bits(gb, 3)];
257 const int base = get_bits(gb, 5);
258 const int len = get_bits(gb, 2) + 3;
259 const VLC *tab = &s->sf_vlc[0][len];
261 c->scalefactors[0] = get_bits(gb, len);
263 for (int i = 1; i < b->band_ext_q_unit; i++) {
264 int val = c->scalefactors[i - 1] + get_vlc2(gb, tab->table, 9, 2);
265 c->scalefactors[i] = val & ((1 << len) - 1);
268 for (int i = 0; i < b->band_ext_q_unit; i++)
269 c->scalefactors[i] += base - sf_weights[i];
273 case 1: { /* CLC offset */
274 const int len = get_bits(gb, 2) + 2;
275 const int base = len < 5 ? get_bits(gb, 5) : 0;
276 for (int i = 0; i < b->band_ext_q_unit; i++)
277 c->scalefactors[i] = base + get_bits(gb, len);
281 case 4: { /* VLC dist to baseline */
282 const int *baseline = mode == 4 ? c->scalefactors_prev :
283 channel_idx ? b->channel[0].scalefactors :
284 c->scalefactors_prev;
285 const int baseline_len = mode == 4 ? b->q_unit_cnt_prev :
286 channel_idx ? b->band_ext_q_unit :
289 const int len = get_bits(gb, 2) + 2;
290 const int unit_cnt = FFMIN(b->band_ext_q_unit, baseline_len);
291 const VLC *tab = &s->sf_vlc[1][len];
293 for (int i = 0; i < unit_cnt; i++) {
294 int dist = get_vlc2(gb, tab->table, 9, 2);
295 c->scalefactors[i] = baseline[i] + dist;
298 for (int i = unit_cnt; i < b->band_ext_q_unit; i++)
299 c->scalefactors[i] = get_bits(gb, 5);
303 case 3: { /* VLC offset with baseline */
304 const int *baseline = channel_idx ? b->channel[0].scalefactors :
305 c->scalefactors_prev;
306 const int baseline_len = channel_idx ? b->band_ext_q_unit :
309 const int base = get_bits(gb, 5) - (1 << (5 - 1));
310 const int len = get_bits(gb, 2) + 1;
311 const int unit_cnt = FFMIN(b->band_ext_q_unit, baseline_len);
312 const VLC *tab = &s->sf_vlc[0][len];
314 c->scalefactors[0] = get_bits(gb, len);
316 for (int i = 1; i < unit_cnt; i++) {
317 int val = c->scalefactors[i - 1] + get_vlc2(gb, tab->table, 9, 2);
318 c->scalefactors[i] = val & ((1 << len) - 1);
321 for (int i = 0; i < unit_cnt; i++)
322 c->scalefactors[i] += base + baseline[i];
324 for (int i = unit_cnt; i < b->band_ext_q_unit; i++)
325 c->scalefactors[i] = get_bits(gb, 5);
330 for (int i = 0; i < b->band_ext_q_unit; i++)
331 if (c->scalefactors[i] < 0 || c->scalefactors[i] > 31)
332 return AVERROR_INVALIDDATA;
334 memcpy(c->scalefactors_prev, c->scalefactors, sizeof(c->scalefactors));
339 static inline void calc_codebook_idx(ATRAC9Context *s, ATRAC9BlockData *b,
340 ATRAC9ChannelData *c)
343 const int last_sf = c->scalefactors[c->q_unit_cnt];
345 memset(c->codebookset, 0, sizeof(c->codebookset));
347 if (c->q_unit_cnt <= 1)
349 if (s->samplerate_idx > 7)
352 c->scalefactors[c->q_unit_cnt] = c->scalefactors[c->q_unit_cnt - 1];
354 if (c->q_unit_cnt > 12) {
355 for (int i = 0; i < 12; i++)
356 avg += c->scalefactors[i];
357 avg = (avg + 6) / 12;
360 for (int i = 8; i < c->q_unit_cnt; i++) {
361 const int prev = c->scalefactors[i - 1];
362 const int cur = c->scalefactors[i ];
363 const int next = c->scalefactors[i + 1];
364 const int min = FFMIN(prev, next);
365 if ((cur - min >= 3 || 2*cur - prev - next >= 3))
366 c->codebookset[i] = 1;
370 for (int i = 12; i < c->q_unit_cnt; i++) {
371 const int cur = c->scalefactors[i];
372 const int cnd = at9_q_unit_to_coeff_cnt[i] == 16;
373 const int min = FFMIN(c->scalefactors[i + 1], c->scalefactors[i - 1]);
374 if (c->codebookset[i])
377 c->codebookset[i] = (((cur - min) >= 2) && (cur >= (avg - cnd)));
380 c->scalefactors[c->q_unit_cnt] = last_sf;
383 static inline void read_coeffs_coarse(ATRAC9Context *s, ATRAC9BlockData *b,
384 ATRAC9ChannelData *c, GetBitContext *gb)
386 const int max_prec = s->samplerate_idx > 7 ? 1 : 7;
388 memset(c->q_coeffs_coarse, 0, sizeof(c->q_coeffs_coarse));
390 for (int i = 0; i < c->q_unit_cnt; i++) {
391 int *coeffs = &c->q_coeffs_coarse[at9_q_unit_to_coeff_idx[i]];
392 const int bands = at9_q_unit_to_coeff_cnt[i];
393 const int prec = c->precision_coarse[i] + 1;
395 if (prec <= max_prec) {
396 const int cb = c->codebookset[i];
397 const int cbi = at9_q_unit_to_codebookidx[i];
398 const VLC *tab = &s->coeff_vlc[cb][prec][cbi];
399 const HuffmanCodebook *huff = &at9_huffman_coeffs[cb][prec][cbi];
400 const int groups = bands >> huff->value_cnt_pow;
402 for (int j = 0; j < groups; j++) {
403 uint16_t val = get_vlc2(gb, tab->table, 9, huff->max_bit_size);
405 for (int k = 0; k < huff->value_cnt; k++) {
406 coeffs[k] = sign_extend(val, huff->value_bits);
407 val >>= huff->value_bits;
410 coeffs += huff->value_cnt;
413 for (int j = 0; j < bands; j++)
414 coeffs[j] = sign_extend(get_bits(gb, prec), prec);
419 static inline void read_coeffs_fine(ATRAC9Context *s, ATRAC9BlockData *b,
420 ATRAC9ChannelData *c, GetBitContext *gb)
422 memset(c->q_coeffs_fine, 0, sizeof(c->q_coeffs_fine));
424 for (int i = 0; i < c->q_unit_cnt; i++) {
425 const int start = at9_q_unit_to_coeff_idx[i + 0];
426 const int end = at9_q_unit_to_coeff_idx[i + 1];
427 const int len = c->precision_fine[i] + 1;
429 if (c->precision_fine[i] <= 0)
432 for (int j = start; j < end; j++)
433 c->q_coeffs_fine[j] = sign_extend(get_bits(gb, len), len);
437 static inline void dequantize(ATRAC9Context *s, ATRAC9BlockData *b,
438 ATRAC9ChannelData *c)
440 memset(c->coeffs, 0, sizeof(c->coeffs));
442 for (int i = 0; i < c->q_unit_cnt; i++) {
443 const int start = at9_q_unit_to_coeff_idx[i + 0];
444 const int end = at9_q_unit_to_coeff_idx[i + 1];
446 const float coarse_c = at9_quant_step_coarse[c->precision_coarse[i]];
447 const float fine_c = at9_quant_step_fine[c->precision_fine[i]];
449 for (int j = start; j < end; j++) {
450 const float vc = c->q_coeffs_coarse[j] * coarse_c;
451 const float vf = c->q_coeffs_fine[j] * fine_c;
452 c->coeffs[j] = vc + vf;
457 static inline void apply_intensity_stereo(ATRAC9Context *s, ATRAC9BlockData *b,
460 float *src = b->channel[ b->cpe_base_channel].coeffs;
461 float *dst = b->channel[!b->cpe_base_channel].coeffs;
466 if (b->q_unit_cnt <= b->stereo_q_unit)
469 for (int i = b->stereo_q_unit; i < b->q_unit_cnt; i++) {
470 const int sign = b->is_signs[i];
471 const int start = at9_q_unit_to_coeff_idx[i + 0];
472 const int end = at9_q_unit_to_coeff_idx[i + 1];
473 for (int j = start; j < end; j++)
474 dst[j] = sign*src[j];
478 static inline void apply_scalefactors(ATRAC9Context *s, ATRAC9BlockData *b,
481 for (int i = 0; i <= stereo; i++) {
482 float *coeffs = b->channel[i].coeffs;
483 for (int j = 0; j < b->q_unit_cnt; j++) {
484 const int start = at9_q_unit_to_coeff_idx[j + 0];
485 const int end = at9_q_unit_to_coeff_idx[j + 1];
486 const int scalefactor = b->channel[i].scalefactors[j];
487 const float scale = at9_scalefactor_c[scalefactor];
488 for (int k = start; k < end; k++)
494 static inline void fill_with_noise(ATRAC9Context *s, ATRAC9ChannelData *c,
495 int start, int count)
498 for (int i = 0; i < count; i += 2) {
500 av_bmg_get(&s->lfg, tmp);
501 c->coeffs[start + i + 0] = tmp[0];
502 c->coeffs[start + i + 1] = tmp[1];
503 maxval = FFMAX(FFMAX(FFABS(tmp[0]), FFABS(tmp[1])), maxval);
506 for (int i = 0; i < count; i++)
507 c->coeffs[start + i] /= maxval;
510 static inline void scale_band_ext_coeffs(ATRAC9ChannelData *c, float sf[6],
511 const int s_unit, const int e_unit)
513 for (int i = s_unit; i < e_unit; i++) {
514 const int start = at9_q_unit_to_coeff_idx[i + 0];
515 const int end = at9_q_unit_to_coeff_idx[i + 1];
516 for (int j = start; j < end; j++)
517 c->coeffs[j] *= sf[i - s_unit];
521 static inline void apply_band_extension(ATRAC9Context *s, ATRAC9BlockData *b,
524 const int g_units[4] = { /* A, B, C, total units */
526 at9_tab_band_ext_group[b->q_unit_cnt - 13][0],
527 at9_tab_band_ext_group[b->q_unit_cnt - 13][1],
528 FFMAX(g_units[2], 22),
531 const int g_bins[4] = { /* A, B, C, total bins */
532 at9_q_unit_to_coeff_idx[g_units[0]],
533 at9_q_unit_to_coeff_idx[g_units[1]],
534 at9_q_unit_to_coeff_idx[g_units[2]],
535 at9_q_unit_to_coeff_idx[g_units[3]],
538 if (!b->has_band_ext || !b->has_band_ext_data)
541 for (int ch = 0; ch <= stereo; ch++) {
542 ATRAC9ChannelData *c = &b->channel[ch];
544 /* Mirror the spectrum */
545 for (int i = 0; i < 3; i++)
546 for (int j = 0; j < (g_bins[i + 1] - g_bins[i + 0]); j++)
547 c->coeffs[g_bins[i] + j] = c->coeffs[g_bins[i] - j - 1];
549 switch (c->band_ext) {
551 float sf[6] = { 0.0f };
552 const int l = g_units[3] - g_units[0] - 1;
553 const int n_start = at9_q_unit_to_coeff_idx[g_units[3] - 1];
554 const int n_cnt = at9_q_unit_to_coeff_cnt[g_units[3] - 1];
555 switch (at9_tab_band_ext_group[b->q_unit_cnt - 13][2]) {
557 sf[0] = at9_band_ext_scales_m0[0][0][c->band_ext_data[0]];
558 sf[1] = at9_band_ext_scales_m0[0][1][c->band_ext_data[0]];
559 sf[2] = at9_band_ext_scales_m0[0][2][c->band_ext_data[1]];
560 sf[3] = at9_band_ext_scales_m0[0][3][c->band_ext_data[2]];
561 sf[4] = at9_band_ext_scales_m0[0][4][c->band_ext_data[3]];
564 sf[0] = at9_band_ext_scales_m0[1][0][c->band_ext_data[0]];
565 sf[1] = at9_band_ext_scales_m0[1][1][c->band_ext_data[0]];
566 sf[2] = at9_band_ext_scales_m0[1][2][c->band_ext_data[1]];
567 sf[3] = at9_band_ext_scales_m0[1][3][c->band_ext_data[2]];
568 sf[4] = at9_band_ext_scales_m0[1][4][c->band_ext_data[3]];
571 sf[0] = at9_band_ext_scales_m0[2][0][c->band_ext_data[0]];
572 sf[1] = at9_band_ext_scales_m0[2][1][c->band_ext_data[1]];
573 sf[2] = at9_band_ext_scales_m0[2][2][c->band_ext_data[1]];
577 sf[l] = at9_scalefactor_c[c->scalefactors[g_units[0]]];
579 fill_with_noise(s, c, n_start, n_cnt);
580 scale_band_ext_coeffs(c, sf, g_units[0], g_units[3]);
585 for (int i = g_units[0]; i < g_units[3]; i++)
586 sf[i - g_units[0]] = at9_scalefactor_c[c->scalefactors[i]];
588 fill_with_noise(s, c, g_bins[0], g_bins[3] - g_bins[0]);
589 scale_band_ext_coeffs(c, sf, g_units[0], g_units[3]);
593 const float g_sf[2] = {
594 at9_band_ext_scales_m2[c->band_ext_data[0]],
595 at9_band_ext_scales_m2[c->band_ext_data[1]],
598 for (int i = 0; i < 2; i++)
599 for (int j = g_bins[i + 0]; j < g_bins[i + 1]; j++)
600 c->coeffs[j] *= g_sf[i];
604 float scale = at9_band_ext_scales_m3[c->band_ext_data[0]][0];
605 float rate = at9_band_ext_scales_m3[c->band_ext_data[1]][1];
607 for (int i = g_bins[0]; i < g_bins[3]; i++) {
609 c->coeffs[i] *= scale;
614 const float m = at9_band_ext_scales_m4[c->band_ext_data[0]];
615 const float g_sf[3] = { 0.7079468f*m, 0.5011902f*m, 0.3548279f*m };
617 for (int i = 0; i < 3; i++)
618 for (int j = g_bins[i + 0]; j < g_bins[i + 1]; j++)
619 c->coeffs[j] *= g_sf[i];
626 static int atrac9_decode_block(ATRAC9Context *s, GetBitContext *gb,
627 ATRAC9BlockData *b, AVFrame *frame,
628 int frame_idx, int block_idx)
630 const int first_in_pkt = !get_bits1(gb);
631 const int reuse_params = get_bits1(gb);
632 const int stereo = s->block_config->type[block_idx] == ATRAC9_BLOCK_TYPE_CPE;
634 if (s->block_config->type[block_idx] == ATRAC9_BLOCK_TYPE_LFE) {
635 ATRAC9ChannelData *c = &b->channel[0];
636 const int precision = reuse_params ? 8 : 4;
637 c->q_unit_cnt = b->q_unit_cnt = 2;
639 memset(c->scalefactors, 0, sizeof(c->scalefactors));
640 memset(c->q_coeffs_fine, 0, sizeof(c->q_coeffs_fine));
641 memset(c->q_coeffs_coarse, 0, sizeof(c->q_coeffs_coarse));
643 for (int i = 0; i < b->q_unit_cnt; i++) {
644 c->scalefactors[i] = get_bits(gb, 5);
645 c->precision_coarse[i] = precision;
646 c->precision_fine[i] = 0;
649 for (int i = 0; i < c->q_unit_cnt; i++) {
650 const int start = at9_q_unit_to_coeff_idx[i + 0];
651 const int end = at9_q_unit_to_coeff_idx[i + 1];
652 for (int j = start; j < end; j++)
653 c->q_coeffs_coarse[j] = get_bits(gb, c->precision_coarse[i] + 1);
656 dequantize (s, b, c);
657 apply_scalefactors(s, b, 0);
662 if (first_in_pkt && reuse_params) {
663 av_log(s->avctx, AV_LOG_ERROR, "Invalid block flags!\n");
664 return AVERROR_INVALIDDATA;
667 /* Band parameters */
669 int stereo_band, ext_band;
670 const int min_band_count = s->samplerate_idx > 7 ? 1 : 3;
671 b->band_count = get_bits(gb, 4) + min_band_count;
672 b->q_unit_cnt = at9_tab_band_q_unit_map[b->band_count];
674 b->band_ext_q_unit = b->stereo_q_unit = b->q_unit_cnt;
676 if (b->band_count > at9_tab_sri_max_bands[s->samplerate_idx]) {
677 av_log(s->avctx, AV_LOG_ERROR, "Invalid band count %i!\n",
679 return AVERROR_INVALIDDATA;
683 stereo_band = get_bits(gb, 4) + min_band_count;
684 if (stereo_band > b->band_count) {
685 av_log(s->avctx, AV_LOG_ERROR, "Invalid stereo band %i!\n",
687 return AVERROR_INVALIDDATA;
689 b->stereo_q_unit = at9_tab_band_q_unit_map[stereo_band];
692 b->has_band_ext = get_bits1(gb);
693 if (b->has_band_ext) {
694 ext_band = get_bits(gb, 4) + min_band_count;
695 if (ext_band < b->band_count) {
696 av_log(s->avctx, AV_LOG_ERROR, "Invalid extension band %i!\n",
698 return AVERROR_INVALIDDATA;
700 b->band_ext_q_unit = at9_tab_band_q_unit_map[ext_band];
704 /* Calculate bit alloc gradient */
705 if (parse_gradient(s, b, gb))
706 return AVERROR_INVALIDDATA;
709 b->cpe_base_channel = 0;
711 b->cpe_base_channel = get_bits1(gb);
713 for (int i = b->stereo_q_unit; i < b->q_unit_cnt; i++)
714 b->is_signs[i] = 1 - 2*get_bits1(gb);
716 for (int i = 0; i < FF_ARRAY_ELEMS(b->is_signs); i++)
722 if (parse_band_ext(s, b, gb, stereo))
723 return AVERROR_INVALIDDATA;
726 for (int i = 0; i <= stereo; i++) {
727 ATRAC9ChannelData *c = &b->channel[i];
728 c->q_unit_cnt = i == b->cpe_base_channel ? b->q_unit_cnt :
730 if (read_scalefactors(s, b, c, gb, i, first_in_pkt))
731 return AVERROR_INVALIDDATA;
733 calc_precision (s, b, c);
734 calc_codebook_idx (s, b, c);
735 read_coeffs_coarse(s, b, c, gb);
736 read_coeffs_fine (s, b, c, gb);
737 dequantize (s, b, c);
740 b->q_unit_cnt_prev = b->has_band_ext ? b->band_ext_q_unit : b->q_unit_cnt;
742 apply_intensity_stereo(s, b, stereo);
743 apply_scalefactors (s, b, stereo);
744 apply_band_extension (s, b, stereo);
747 for (int i = 0; i <= stereo; i++) {
748 ATRAC9ChannelData *c = &b->channel[i];
749 const int dst_idx = s->block_config->plane_map[block_idx][i];
750 const int wsize = 1 << s->frame_log2;
751 const ptrdiff_t offset = wsize*frame_idx*sizeof(float);
752 float *dst = (float *)(frame->extended_data[dst_idx] + offset);
754 s->imdct.imdct_half(&s->imdct, s->temp, c->coeffs);
755 s->fdsp->vector_fmul_window(dst, c->prev_win, s->temp,
756 s->imdct_win, wsize >> 1);
757 memcpy(c->prev_win, s->temp + (wsize >> 1), sizeof(float)*wsize >> 1);
763 static int atrac9_decode_frame(AVCodecContext *avctx, void *data,
764 int *got_frame_ptr, AVPacket *avpkt)
768 AVFrame *frame = data;
769 ATRAC9Context *s = avctx->priv_data;
770 const int frames = FFMIN(avpkt->size / s->avg_frame_size, s->frame_count);
772 frame->nb_samples = (1 << s->frame_log2) * frames;
773 ret = ff_get_buffer(avctx, frame, 0);
777 init_get_bits8(&gb, avpkt->data, avpkt->size);
779 for (int i = 0; i < frames; i++) {
780 for (int j = 0; j < s->block_config->count; j++) {
781 ret = atrac9_decode_block(s, &gb, &s->block[j], frame, i, j);
790 return avctx->block_align;
793 static void atrac9_decode_flush(AVCodecContext *avctx)
795 ATRAC9Context *s = avctx->priv_data;
797 for (int j = 0; j < s->block_config->count; j++) {
798 ATRAC9BlockData *b = &s->block[j];
799 const int stereo = s->block_config->type[j] == ATRAC9_BLOCK_TYPE_CPE;
800 for (int i = 0; i <= stereo; i++) {
801 ATRAC9ChannelData *c = &b->channel[i];
802 memset(c->prev_win, 0, sizeof(c->prev_win));
807 static av_cold int atrac9_decode_close(AVCodecContext *avctx)
809 ATRAC9Context *s = avctx->priv_data;
811 for (int i = 1; i < 7; i++)
812 ff_free_vlc(&s->sf_vlc[0][i]);
813 for (int i = 2; i < 6; i++)
814 ff_free_vlc(&s->sf_vlc[1][i]);
815 for (int i = 0; i < 2; i++)
816 for (int j = 0; j < 8; j++)
817 for (int k = 0; k < 4; k++)
818 ff_free_vlc(&s->coeff_vlc[i][j][k]);
820 ff_mdct_end(&s->imdct);
826 static av_cold int atrac9_decode_init(AVCodecContext *avctx)
829 ATRAC9Context *s = avctx->priv_data;
830 int version, block_config_idx, superframe_idx, alloc_c_len;
834 av_lfg_init(&s->lfg, 0xFBADF00D);
836 if (avctx->extradata_size != 12) {
837 av_log(avctx, AV_LOG_ERROR, "Invalid extradata length!\n");
838 return AVERROR_INVALIDDATA;
841 version = AV_RL32(avctx->extradata);
843 av_log(avctx, AV_LOG_ERROR, "Unsupported version (%i)!\n", version);
844 return AVERROR_INVALIDDATA;
847 init_get_bits8(&gb, avctx->extradata + 4, avctx->extradata_size);
849 if (get_bits(&gb, 8) != 0xFE) {
850 av_log(avctx, AV_LOG_ERROR, "Incorrect magic byte!\n");
851 return AVERROR_INVALIDDATA;
854 s->samplerate_idx = get_bits(&gb, 4);
855 avctx->sample_rate = at9_tab_samplerates[s->samplerate_idx];
857 block_config_idx = get_bits(&gb, 3);
858 if (block_config_idx > 5) {
859 av_log(avctx, AV_LOG_ERROR, "Incorrect block config!\n");
860 return AVERROR_INVALIDDATA;
862 s->block_config = &at9_block_layout[block_config_idx];
864 avctx->channel_layout = s->block_config->channel_layout;
865 avctx->sample_fmt = AV_SAMPLE_FMT_FLTP;
867 if (get_bits1(&gb)) {
868 av_log(avctx, AV_LOG_ERROR, "Incorrect verification bit!\n");
869 return AVERROR_INVALIDDATA;
872 /* Average frame size in bytes */
873 s->avg_frame_size = get_bits(&gb, 11) + 1;
875 superframe_idx = get_bits(&gb, 2);
876 if (superframe_idx & 1) {
877 av_log(avctx, AV_LOG_ERROR, "Invalid superframe index!\n");
878 return AVERROR_INVALIDDATA;
881 s->frame_count = 1 << superframe_idx;
882 s->frame_log2 = at9_tab_sri_frame_log2[s->samplerate_idx];
884 if (ff_mdct_init(&s->imdct, s->frame_log2 + 1, 1, 1.0f / 32768.0f))
885 return AVERROR(ENOMEM);
887 s->fdsp = avpriv_float_dsp_alloc(avctx->flags & AV_CODEC_FLAG_BITEXACT);
889 return AVERROR(ENOMEM);
892 for (int i = 0; i < (1 << s->frame_log2); i++) {
893 const int len = 1 << s->frame_log2;
894 const float sidx = ( i + 0.5f) / len;
895 const float eidx = (len - i - 0.5f) / len;
896 const float s_c = sinf(sidx*M_PI - M_PI_2)*0.5f + 0.5f;
897 const float e_c = sinf(eidx*M_PI - M_PI_2)*0.5f + 0.5f;
898 s->imdct_win[i] = s_c / ((s_c * s_c) + (e_c * e_c));
901 /* Allocation curve */
902 alloc_c_len = FF_ARRAY_ELEMS(at9_tab_b_dist);
903 for (int i = 1; i <= alloc_c_len; i++)
904 for (int j = 0; j < i; j++)
905 s->alloc_curve[i - 1][j] = at9_tab_b_dist[(j * alloc_c_len) / i];
907 /* Unsigned scalefactor VLCs */
908 for (int i = 1; i < 7; i++) {
909 const HuffmanCodebook *hf = &at9_huffman_sf_unsigned[i];
911 init_vlc(&s->sf_vlc[0][i], 9, hf->size, hf->bits, 1, 1, hf->codes,
915 /* Signed scalefactor VLCs */
916 for (int i = 2; i < 6; i++) {
917 const HuffmanCodebook *hf = &at9_huffman_sf_signed[i];
921 for (int j = 0; j < nums; j++)
922 sym[j] = sign_extend(j, hf->value_bits);
924 ff_init_vlc_sparse(&s->sf_vlc[1][i], 9, hf->size, hf->bits, 1, 1,
925 hf->codes, 2, 2, sym, sizeof(*sym), sizeof(*sym), 0);
928 /* Coefficient VLCs */
929 for (int i = 0; i < 2; i++) {
930 for (int j = 0; j < 8; j++) {
931 for (int k = 0; k < 4; k++) {
932 const HuffmanCodebook *hf = &at9_huffman_coeffs[i][j][k];
933 init_vlc(&s->coeff_vlc[i][j][k], 9, hf->size, hf->bits, 1, 1,
942 AVCodec ff_atrac9_decoder = {
944 .long_name = NULL_IF_CONFIG_SMALL("ATRAC9 (Adaptive TRansform Acoustic Coding 9)"),
945 .type = AVMEDIA_TYPE_AUDIO,
946 .id = AV_CODEC_ID_ATRAC9,
947 .priv_data_size = sizeof(ATRAC9Context),
948 .init = atrac9_decode_init,
949 .close = atrac9_decode_close,
950 .decode = atrac9_decode_frame,
951 .flush = atrac9_decode_flush,
952 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE | FF_CODEC_CAP_INIT_CLEANUP,
953 .capabilities = AV_CODEC_CAP_SUBFRAMES | AV_CODEC_CAP_DR1,