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;
78 typedef struct ATRAC9Context {
79 AVCodecContext *avctx;
80 AVFloatDSPContext *fdsp;
82 ATRAC9BlockData block[5];
90 const ATRAC9BlockConfig *block_config;
92 /* Generated on init */
93 VLC sf_vlc[2][8]; /* Signed/unsigned, length */
94 VLC coeff_vlc[2][8][4]; /* Cookbook, precision, cookbook index */
95 uint8_t alloc_curve[48][48];
96 DECLARE_ALIGNED(32, float, imdct_win)[256];
98 DECLARE_ALIGNED(32, float, temp)[256];
101 static inline int parse_gradient(ATRAC9Context *s, ATRAC9BlockData *b,
106 int values, sign, base;
110 b->grad_mode = get_bits(gb, 2);
112 grad_range[0] = get_bits(gb, 5);
114 grad_value[0] = get_bits(gb, 5);
117 grad_range[0] = get_bits(gb, 6);
118 grad_range[1] = get_bits(gb, 6) + 1;
119 grad_value[0] = get_bits(gb, 5);
120 grad_value[1] = get_bits(gb, 5);
122 b->grad_boundary = get_bits(gb, 4);
124 if (grad_range[0] >= grad_range[1] || grad_range[1] > 47)
125 return AVERROR_INVALIDDATA;
127 if (grad_value[0] > 31 || grad_value[1] > 31)
128 return AVERROR_INVALIDDATA;
130 if (b->grad_boundary > b->q_unit_cnt)
131 return AVERROR_INVALIDDATA;
133 values = grad_value[1] - grad_value[0];
134 sign = 1 - 2*(values < 0);
135 base = grad_value[0] + sign;
136 scale = (FFABS(values) - 1) / 31.0f;
137 curve = s->alloc_curve[grad_range[1] - grad_range[0] - 1];
139 for (int i = 0; i <= b->q_unit_cnt; i++)
140 b->gradient[i] = grad_value[i >= grad_range[0]];
142 for (int i = grad_range[0]; i < grad_range[1]; i++)
143 b->gradient[i] = base + sign*((int)(scale*curve[i - grad_range[0]]));
148 static inline void calc_precision(ATRAC9Context *s, ATRAC9BlockData *b,
149 ATRAC9ChannelData *c)
151 memset(c->precision_mask, 0, sizeof(c->precision_mask));
152 for (int i = 1; i < b->q_unit_cnt; i++) {
153 const int delta = FFABS(c->scalefactors[i] - c->scalefactors[i - 1]) - 1;
155 const int neg = c->scalefactors[i - 1] > c->scalefactors[i];
156 c->precision_mask[i - neg] += FFMIN(delta, 5);
161 for (int i = 0; i < b->q_unit_cnt; i++) {
162 c->precision_coarse[i] = c->scalefactors[i];
163 c->precision_coarse[i] += c->precision_mask[i] - b->gradient[i];
164 if (c->precision_coarse[i] < 0)
166 switch (b->grad_mode) {
168 c->precision_coarse[i] >>= 1;
171 c->precision_coarse[i] = (3 * c->precision_coarse[i]) >> 3;
174 c->precision_coarse[i] >>= 2;
179 for (int i = 0; i < b->q_unit_cnt; i++)
180 c->precision_coarse[i] = c->scalefactors[i] - b->gradient[i];
184 for (int i = 0; i < b->q_unit_cnt; i++)
185 c->precision_coarse[i] = FFMAX(c->precision_coarse[i], 1);
187 for (int i = 0; i < b->grad_boundary; i++)
188 c->precision_coarse[i]++;
190 for (int i = 0; i < b->q_unit_cnt; i++) {
191 c->precision_fine[i] = 0;
192 if (c->precision_coarse[i] > 15) {
193 c->precision_fine[i] = c->precision_coarse[i] - 15;
194 c->precision_coarse[i] = 15;
199 static inline int parse_band_ext(ATRAC9Context *s, ATRAC9BlockData *b,
200 GetBitContext *gb, int stereo)
204 if (b->has_band_ext) {
205 ext_band = at9_tab_band_ext_group[b->q_unit_cnt - 13][2];
207 b->channel[1].band_ext = get_bits(gb, 2);
208 b->channel[1].band_ext = ext_band > 2 ? b->channel[1].band_ext : 4;
214 b->has_band_ext_data = get_bits1(gb);
215 if (!b->has_band_ext_data)
218 if (!b->has_band_ext) {
220 skip_bits_long(gb, get_bits(gb, 5));
224 b->channel[0].band_ext = get_bits(gb, 2);
225 b->channel[0].band_ext = ext_band > 2 ? b->channel[0].band_ext : 4;
227 if (!get_bits(gb, 5))
230 for (int i = 0; i <= stereo; i++) {
231 ATRAC9ChannelData *c = &b->channel[i];
232 const int count = at9_tab_band_ext_cnt[c->band_ext][ext_band];
233 for (int j = 0; j < count; j++) {
234 int len = at9_tab_band_ext_lengths[c->band_ext][ext_band][j];
235 c->band_ext_data[j] = get_bits(gb, len);
242 static inline int read_scalefactors(ATRAC9Context *s, ATRAC9BlockData *b,
243 ATRAC9ChannelData *c, GetBitContext *gb,
244 int channel_idx, int first_in_pkt)
246 static const uint8_t mode_map[2][4] = { { 0, 1, 2, 3 }, { 0, 2, 3, 4 } };
247 const int mode = mode_map[channel_idx][get_bits(gb, 2)];
249 memset(c->scalefactors, 0, sizeof(c->scalefactors));
251 if (first_in_pkt && (mode == 4 || ((mode == 3) && !channel_idx))) {
252 av_log(s->avctx, AV_LOG_ERROR, "Invalid scalefactor coding mode!\n");
253 return AVERROR_INVALIDDATA;
257 case 0: { /* VLC delta offset */
258 const uint8_t *sf_weights = at9_tab_sf_weights[get_bits(gb, 3)];
259 const int base = get_bits(gb, 5);
260 const int len = get_bits(gb, 2) + 3;
261 const VLC *tab = &s->sf_vlc[0][len];
263 c->scalefactors[0] = get_bits(gb, len);
265 for (int i = 1; i < b->band_ext_q_unit; i++) {
266 int val = c->scalefactors[i - 1] + get_vlc2(gb, tab->table, 9, 2);
267 c->scalefactors[i] = val & ((1 << len) - 1);
270 for (int i = 0; i < b->band_ext_q_unit; i++)
271 c->scalefactors[i] += base - sf_weights[i];
275 case 1: { /* CLC offset */
276 const int len = get_bits(gb, 2) + 2;
277 const int base = len < 5 ? get_bits(gb, 5) : 0;
278 for (int i = 0; i < b->band_ext_q_unit; i++)
279 c->scalefactors[i] = base + get_bits(gb, len);
283 case 4: { /* VLC dist to baseline */
284 const int *baseline = mode == 4 ? c->scalefactors_prev :
285 channel_idx ? b->channel[0].scalefactors :
286 c->scalefactors_prev;
287 const int baseline_len = mode == 4 ? b->q_unit_cnt_prev :
288 channel_idx ? b->band_ext_q_unit :
291 const int len = get_bits(gb, 2) + 2;
292 const int unit_cnt = FFMIN(b->band_ext_q_unit, baseline_len);
293 const VLC *tab = &s->sf_vlc[1][len];
295 for (int i = 0; i < unit_cnt; i++) {
296 int dist = get_vlc2(gb, tab->table, 9, 2);
297 c->scalefactors[i] = baseline[i] + dist;
300 for (int i = unit_cnt; i < b->band_ext_q_unit; i++)
301 c->scalefactors[i] = get_bits(gb, 5);
305 case 3: { /* VLC offset with baseline */
306 const int *baseline = channel_idx ? b->channel[0].scalefactors :
307 c->scalefactors_prev;
308 const int baseline_len = channel_idx ? b->band_ext_q_unit :
311 const int base = get_bits(gb, 5) - (1 << (5 - 1));
312 const int len = get_bits(gb, 2) + 1;
313 const int unit_cnt = FFMIN(b->band_ext_q_unit, baseline_len);
314 const VLC *tab = &s->sf_vlc[0][len];
316 c->scalefactors[0] = get_bits(gb, len);
318 for (int i = 1; i < unit_cnt; i++) {
319 int val = c->scalefactors[i - 1] + get_vlc2(gb, tab->table, 9, 2);
320 c->scalefactors[i] = val & ((1 << len) - 1);
323 for (int i = 0; i < unit_cnt; i++)
324 c->scalefactors[i] += base + baseline[i];
326 for (int i = unit_cnt; i < b->band_ext_q_unit; i++)
327 c->scalefactors[i] = get_bits(gb, 5);
332 for (int i = 0; i < b->band_ext_q_unit; i++)
333 if (c->scalefactors[i] < 0 || c->scalefactors[i] > 31)
334 return AVERROR_INVALIDDATA;
336 memcpy(c->scalefactors_prev, c->scalefactors, sizeof(c->scalefactors));
341 static inline void calc_codebook_idx(ATRAC9Context *s, ATRAC9BlockData *b,
342 ATRAC9ChannelData *c)
345 const int last_sf = c->scalefactors[c->q_unit_cnt];
347 memset(c->codebookset, 0, sizeof(c->codebookset));
349 if (c->q_unit_cnt <= 1)
351 if (s->samplerate_idx > 7)
354 c->scalefactors[c->q_unit_cnt] = c->scalefactors[c->q_unit_cnt - 1];
356 if (c->q_unit_cnt > 12) {
357 for (int i = 0; i < 12; i++)
358 avg += c->scalefactors[i];
359 avg = (avg + 6) / 12;
362 for (int i = 8; i < c->q_unit_cnt; i++) {
363 const int prev = c->scalefactors[i - 1];
364 const int cur = c->scalefactors[i ];
365 const int next = c->scalefactors[i + 1];
366 const int min = FFMIN(prev, next);
367 if ((cur - min >= 3 || 2*cur - prev - next >= 3))
368 c->codebookset[i] = 1;
372 for (int i = 12; i < c->q_unit_cnt; i++) {
373 const int cur = c->scalefactors[i];
374 const int cnd = at9_q_unit_to_coeff_cnt[i] == 16;
375 const int min = FFMIN(c->scalefactors[i + 1], c->scalefactors[i - 1]);
376 if (c->codebookset[i])
379 c->codebookset[i] = (((cur - min) >= 2) && (cur >= (avg - cnd)));
382 c->scalefactors[c->q_unit_cnt] = last_sf;
385 static inline void read_coeffs_coarse(ATRAC9Context *s, ATRAC9BlockData *b,
386 ATRAC9ChannelData *c, GetBitContext *gb)
388 const int max_prec = s->samplerate_idx > 7 ? 1 : 7;
390 memset(c->q_coeffs_coarse, 0, sizeof(c->q_coeffs_coarse));
392 for (int i = 0; i < c->q_unit_cnt; i++) {
393 int *coeffs = &c->q_coeffs_coarse[at9_q_unit_to_coeff_idx[i]];
394 const int bands = at9_q_unit_to_coeff_cnt[i];
395 const int prec = c->precision_coarse[i] + 1;
397 if (prec <= max_prec) {
398 const int cb = c->codebookset[i];
399 const int cbi = at9_q_unit_to_codebookidx[i];
400 const VLC *tab = &s->coeff_vlc[cb][prec][cbi];
401 const HuffmanCodebook *huff = &at9_huffman_coeffs[cb][prec][cbi];
402 const int groups = bands >> huff->value_cnt_pow;
404 for (int j = 0; j < groups; j++) {
405 uint16_t val = get_vlc2(gb, tab->table, 9, huff->max_bit_size);
407 for (int k = 0; k < huff->value_cnt; k++) {
408 coeffs[k] = sign_extend(val, huff->value_bits);
409 val >>= huff->value_bits;
412 coeffs += huff->value_cnt;
415 for (int j = 0; j < bands; j++)
416 coeffs[j] = sign_extend(get_bits(gb, prec), prec);
421 static inline void read_coeffs_fine(ATRAC9Context *s, ATRAC9BlockData *b,
422 ATRAC9ChannelData *c, GetBitContext *gb)
424 memset(c->q_coeffs_fine, 0, sizeof(c->q_coeffs_fine));
426 for (int i = 0; i < c->q_unit_cnt; i++) {
427 const int start = at9_q_unit_to_coeff_idx[i + 0];
428 const int end = at9_q_unit_to_coeff_idx[i + 1];
429 const int len = c->precision_fine[i] + 1;
431 if (c->precision_fine[i] <= 0)
434 for (int j = start; j < end; j++)
435 c->q_coeffs_fine[j] = sign_extend(get_bits(gb, len), len);
439 static inline void dequantize(ATRAC9Context *s, ATRAC9BlockData *b,
440 ATRAC9ChannelData *c)
442 memset(c->coeffs, 0, sizeof(c->coeffs));
444 for (int i = 0; i < c->q_unit_cnt; i++) {
445 const int start = at9_q_unit_to_coeff_idx[i + 0];
446 const int end = at9_q_unit_to_coeff_idx[i + 1];
448 const float coarse_c = at9_quant_step_coarse[c->precision_coarse[i]];
449 const float fine_c = at9_quant_step_fine[c->precision_fine[i]];
451 for (int j = start; j < end; j++) {
452 const float vc = c->q_coeffs_coarse[j] * coarse_c;
453 const float vf = c->q_coeffs_fine[j] * fine_c;
454 c->coeffs[j] = vc + vf;
459 static inline void apply_intensity_stereo(ATRAC9Context *s, ATRAC9BlockData *b,
462 float *src = b->channel[ b->cpe_base_channel].coeffs;
463 float *dst = b->channel[!b->cpe_base_channel].coeffs;
468 if (b->q_unit_cnt <= b->stereo_q_unit)
471 for (int i = b->stereo_q_unit; i < b->q_unit_cnt; i++) {
472 const int sign = b->is_signs[i];
473 const int start = at9_q_unit_to_coeff_idx[i + 0];
474 const int end = at9_q_unit_to_coeff_idx[i + 1];
475 for (int j = start; j < end; j++)
476 dst[j] = sign*src[j];
480 static inline void apply_scalefactors(ATRAC9Context *s, ATRAC9BlockData *b,
483 for (int i = 0; i <= stereo; i++) {
484 float *coeffs = b->channel[i].coeffs;
485 for (int j = 0; j < b->q_unit_cnt; j++) {
486 const int start = at9_q_unit_to_coeff_idx[j + 0];
487 const int end = at9_q_unit_to_coeff_idx[j + 1];
488 const int scalefactor = b->channel[i].scalefactors[j];
489 const float scale = at9_scalefactor_c[scalefactor];
490 for (int k = start; k < end; k++)
496 static inline void fill_with_noise(ATRAC9Context *s, ATRAC9ChannelData *c,
497 int start, int count)
500 for (int i = 0; i < count; i += 2) {
502 av_bmg_get(&s->lfg, tmp);
503 c->coeffs[start + i + 0] = tmp[0];
504 c->coeffs[start + i + 1] = tmp[1];
505 maxval = FFMAX(FFMAX(FFABS(tmp[0]), FFABS(tmp[1])), maxval);
508 for (int i = 0; i < count; i++)
509 c->coeffs[start + i] /= maxval;
512 static inline void scale_band_ext_coeffs(ATRAC9ChannelData *c, float sf[6],
513 const int s_unit, const int e_unit)
515 for (int i = s_unit; i < e_unit; i++) {
516 const int start = at9_q_unit_to_coeff_idx[i + 0];
517 const int end = at9_q_unit_to_coeff_idx[i + 1];
518 for (int j = start; j < end; j++)
519 c->coeffs[j] *= sf[i - s_unit];
523 static inline void apply_band_extension(ATRAC9Context *s, ATRAC9BlockData *b,
526 const int g_units[4] = { /* A, B, C, total units */
528 at9_tab_band_ext_group[b->q_unit_cnt - 13][0],
529 at9_tab_band_ext_group[b->q_unit_cnt - 13][1],
530 FFMAX(g_units[2], 22),
533 const int g_bins[4] = { /* A, B, C, total bins */
534 at9_q_unit_to_coeff_idx[g_units[0]],
535 at9_q_unit_to_coeff_idx[g_units[1]],
536 at9_q_unit_to_coeff_idx[g_units[2]],
537 at9_q_unit_to_coeff_idx[g_units[3]],
540 if (!b->has_band_ext || !b->has_band_ext_data)
543 for (int ch = 0; ch <= stereo; ch++) {
544 ATRAC9ChannelData *c = &b->channel[ch];
546 /* Mirror the spectrum */
547 for (int i = 0; i < 3; i++)
548 for (int j = 0; j < (g_bins[i + 1] - g_bins[i + 0]); j++)
549 c->coeffs[g_bins[i] + j] = c->coeffs[g_bins[i] - j - 1];
551 switch (c->band_ext) {
553 float sf[6] = { 0.0f };
554 const int l = g_units[3] - g_units[0] - 1;
555 const int n_start = at9_q_unit_to_coeff_idx[g_units[3] - 1];
556 const int n_cnt = at9_q_unit_to_coeff_cnt[g_units[3] - 1];
557 switch (at9_tab_band_ext_group[b->q_unit_cnt - 13][2]) {
559 sf[0] = at9_band_ext_scales_m0[0][0][c->band_ext_data[0]];
560 sf[1] = at9_band_ext_scales_m0[0][1][c->band_ext_data[0]];
561 sf[2] = at9_band_ext_scales_m0[0][2][c->band_ext_data[1]];
562 sf[3] = at9_band_ext_scales_m0[0][3][c->band_ext_data[2]];
563 sf[4] = at9_band_ext_scales_m0[0][4][c->band_ext_data[3]];
566 sf[0] = at9_band_ext_scales_m0[1][0][c->band_ext_data[0]];
567 sf[1] = at9_band_ext_scales_m0[1][1][c->band_ext_data[0]];
568 sf[2] = at9_band_ext_scales_m0[1][2][c->band_ext_data[1]];
569 sf[3] = at9_band_ext_scales_m0[1][3][c->band_ext_data[2]];
570 sf[4] = at9_band_ext_scales_m0[1][4][c->band_ext_data[3]];
573 sf[0] = at9_band_ext_scales_m0[2][0][c->band_ext_data[0]];
574 sf[1] = at9_band_ext_scales_m0[2][1][c->band_ext_data[1]];
575 sf[2] = at9_band_ext_scales_m0[2][2][c->band_ext_data[1]];
579 sf[l] = at9_scalefactor_c[c->scalefactors[g_units[0]]];
581 fill_with_noise(s, c, n_start, n_cnt);
582 scale_band_ext_coeffs(c, sf, g_units[0], g_units[3]);
587 for (int i = g_units[0]; i < g_units[3]; i++)
588 sf[i - g_units[0]] = at9_scalefactor_c[c->scalefactors[i]];
590 fill_with_noise(s, c, g_bins[0], g_bins[3] - g_bins[0]);
591 scale_band_ext_coeffs(c, sf, g_units[0], g_units[3]);
595 const float g_sf[2] = {
596 at9_band_ext_scales_m2[c->band_ext_data[0]],
597 at9_band_ext_scales_m2[c->band_ext_data[1]],
600 for (int i = 0; i < 2; i++)
601 for (int j = g_bins[i + 0]; j < g_bins[i + 1]; j++)
602 c->coeffs[j] *= g_sf[i];
606 float scale = at9_band_ext_scales_m3[c->band_ext_data[0]][0];
607 float rate = at9_band_ext_scales_m3[c->band_ext_data[1]][1];
609 for (int i = g_bins[0]; i < g_bins[3]; i++) {
611 c->coeffs[i] *= scale;
616 const float m = at9_band_ext_scales_m4[c->band_ext_data[0]];
617 const float g_sf[3] = { 0.7079468f*m, 0.5011902f*m, 0.3548279f*m };
619 for (int i = 0; i < 3; i++)
620 for (int j = g_bins[i + 0]; j < g_bins[i + 1]; j++)
621 c->coeffs[j] *= g_sf[i];
628 static int atrac9_decode_block(ATRAC9Context *s, GetBitContext *gb,
629 ATRAC9BlockData *b, AVFrame *frame,
630 int frame_idx, int block_idx)
632 const int first_in_pkt = !get_bits1(gb);
633 const int reuse_params = get_bits1(gb);
634 const int stereo = s->block_config->type[block_idx] == ATRAC9_BLOCK_TYPE_CPE;
636 if (s->block_config->type[block_idx] == ATRAC9_BLOCK_TYPE_LFE) {
637 ATRAC9ChannelData *c = &b->channel[0];
638 const int precision = reuse_params ? 8 : 4;
639 c->q_unit_cnt = b->q_unit_cnt = 2;
641 memset(c->scalefactors, 0, sizeof(c->scalefactors));
642 memset(c->q_coeffs_fine, 0, sizeof(c->q_coeffs_fine));
643 memset(c->q_coeffs_coarse, 0, sizeof(c->q_coeffs_coarse));
645 for (int i = 0; i < b->q_unit_cnt; i++) {
646 c->scalefactors[i] = get_bits(gb, 5);
647 c->precision_coarse[i] = precision;
648 c->precision_fine[i] = 0;
651 for (int i = 0; i < c->q_unit_cnt; i++) {
652 const int start = at9_q_unit_to_coeff_idx[i + 0];
653 const int end = at9_q_unit_to_coeff_idx[i + 1];
654 for (int j = start; j < end; j++)
655 c->q_coeffs_coarse[j] = get_bits(gb, c->precision_coarse[i] + 1);
658 dequantize (s, b, c);
659 apply_scalefactors(s, b, 0);
664 if (first_in_pkt && reuse_params) {
665 av_log(s->avctx, AV_LOG_ERROR, "Invalid block flags!\n");
666 return AVERROR_INVALIDDATA;
669 /* Band parameters */
671 int stereo_band, ext_band;
672 const int min_band_count = s->samplerate_idx > 7 ? 1 : 3;
674 b->band_count = get_bits(gb, 4) + min_band_count;
675 b->q_unit_cnt = at9_tab_band_q_unit_map[b->band_count];
677 b->band_ext_q_unit = b->stereo_q_unit = b->q_unit_cnt;
679 if (b->band_count > at9_tab_sri_max_bands[s->samplerate_idx]) {
680 av_log(s->avctx, AV_LOG_ERROR, "Invalid band count %i!\n",
682 return AVERROR_INVALIDDATA;
686 stereo_band = get_bits(gb, 4) + min_band_count;
687 if (stereo_band > b->band_count) {
688 av_log(s->avctx, AV_LOG_ERROR, "Invalid stereo band %i!\n",
690 return AVERROR_INVALIDDATA;
692 b->stereo_q_unit = at9_tab_band_q_unit_map[stereo_band];
695 b->has_band_ext = get_bits1(gb);
696 if (b->has_band_ext) {
697 ext_band = get_bits(gb, 4) + min_band_count;
698 if (ext_band < b->band_count) {
699 av_log(s->avctx, AV_LOG_ERROR, "Invalid extension band %i!\n",
701 return AVERROR_INVALIDDATA;
703 b->band_ext_q_unit = at9_tab_band_q_unit_map[ext_band];
708 av_log(s->avctx, AV_LOG_ERROR, "invalid block reused!\n");
709 return AVERROR_INVALIDDATA;
712 /* Calculate bit alloc gradient */
713 if (parse_gradient(s, b, gb))
714 return AVERROR_INVALIDDATA;
717 b->cpe_base_channel = 0;
719 b->cpe_base_channel = get_bits1(gb);
721 for (int i = b->stereo_q_unit; i < b->q_unit_cnt; i++)
722 b->is_signs[i] = 1 - 2*get_bits1(gb);
724 for (int i = 0; i < FF_ARRAY_ELEMS(b->is_signs); i++)
730 if (parse_band_ext(s, b, gb, stereo))
731 return AVERROR_INVALIDDATA;
734 for (int i = 0; i <= stereo; i++) {
735 ATRAC9ChannelData *c = &b->channel[i];
736 c->q_unit_cnt = i == b->cpe_base_channel ? b->q_unit_cnt :
738 if (read_scalefactors(s, b, c, gb, i, first_in_pkt))
739 return AVERROR_INVALIDDATA;
741 calc_precision (s, b, c);
742 calc_codebook_idx (s, b, c);
743 read_coeffs_coarse(s, b, c, gb);
744 read_coeffs_fine (s, b, c, gb);
745 dequantize (s, b, c);
748 b->q_unit_cnt_prev = b->has_band_ext ? b->band_ext_q_unit : b->q_unit_cnt;
750 apply_intensity_stereo(s, b, stereo);
751 apply_scalefactors (s, b, stereo);
752 apply_band_extension (s, b, stereo);
755 for (int i = 0; i <= stereo; i++) {
756 ATRAC9ChannelData *c = &b->channel[i];
757 const int dst_idx = s->block_config->plane_map[block_idx][i];
758 const int wsize = 1 << s->frame_log2;
759 const ptrdiff_t offset = wsize*frame_idx*sizeof(float);
760 float *dst = (float *)(frame->extended_data[dst_idx] + offset);
762 s->imdct.imdct_half(&s->imdct, s->temp, c->coeffs);
763 s->fdsp->vector_fmul_window(dst, c->prev_win, s->temp,
764 s->imdct_win, wsize >> 1);
765 memcpy(c->prev_win, s->temp + (wsize >> 1), sizeof(float)*wsize >> 1);
771 static int atrac9_decode_frame(AVCodecContext *avctx, void *data,
772 int *got_frame_ptr, AVPacket *avpkt)
776 AVFrame *frame = data;
777 ATRAC9Context *s = avctx->priv_data;
778 const int frames = FFMIN(avpkt->size / s->avg_frame_size, s->frame_count);
780 frame->nb_samples = (1 << s->frame_log2) * frames;
781 ret = ff_get_buffer(avctx, frame, 0);
785 init_get_bits8(&gb, avpkt->data, avpkt->size);
787 for (int i = 0; i < frames; i++) {
788 for (int j = 0; j < s->block_config->count; j++) {
789 ret = atrac9_decode_block(s, &gb, &s->block[j], frame, i, j);
798 return avctx->block_align;
801 static void atrac9_decode_flush(AVCodecContext *avctx)
803 ATRAC9Context *s = avctx->priv_data;
805 for (int j = 0; j < s->block_config->count; j++) {
806 ATRAC9BlockData *b = &s->block[j];
807 const int stereo = s->block_config->type[j] == ATRAC9_BLOCK_TYPE_CPE;
808 for (int i = 0; i <= stereo; i++) {
809 ATRAC9ChannelData *c = &b->channel[i];
810 memset(c->prev_win, 0, sizeof(c->prev_win));
815 static av_cold int atrac9_decode_close(AVCodecContext *avctx)
817 ATRAC9Context *s = avctx->priv_data;
819 for (int i = 1; i < 7; i++)
820 ff_free_vlc(&s->sf_vlc[0][i]);
821 for (int i = 2; i < 6; i++)
822 ff_free_vlc(&s->sf_vlc[1][i]);
823 for (int i = 0; i < 2; i++)
824 for (int j = 0; j < 8; j++)
825 for (int k = 0; k < 4; k++)
826 ff_free_vlc(&s->coeff_vlc[i][j][k]);
828 ff_mdct_end(&s->imdct);
834 static av_cold int atrac9_decode_init(AVCodecContext *avctx)
837 ATRAC9Context *s = avctx->priv_data;
838 int version, block_config_idx, superframe_idx, alloc_c_len;
842 av_lfg_init(&s->lfg, 0xFBADF00D);
844 if (avctx->extradata_size != 12) {
845 av_log(avctx, AV_LOG_ERROR, "Invalid extradata length!\n");
846 return AVERROR_INVALIDDATA;
849 version = AV_RL32(avctx->extradata);
851 av_log(avctx, AV_LOG_ERROR, "Unsupported version (%i)!\n", version);
852 return AVERROR_INVALIDDATA;
855 init_get_bits8(&gb, avctx->extradata + 4, avctx->extradata_size);
857 if (get_bits(&gb, 8) != 0xFE) {
858 av_log(avctx, AV_LOG_ERROR, "Incorrect magic byte!\n");
859 return AVERROR_INVALIDDATA;
862 s->samplerate_idx = get_bits(&gb, 4);
863 avctx->sample_rate = at9_tab_samplerates[s->samplerate_idx];
865 block_config_idx = get_bits(&gb, 3);
866 if (block_config_idx > 5) {
867 av_log(avctx, AV_LOG_ERROR, "Incorrect block config!\n");
868 return AVERROR_INVALIDDATA;
870 s->block_config = &at9_block_layout[block_config_idx];
872 avctx->channel_layout = s->block_config->channel_layout;
873 avctx->sample_fmt = AV_SAMPLE_FMT_FLTP;
875 if (get_bits1(&gb)) {
876 av_log(avctx, AV_LOG_ERROR, "Incorrect verification bit!\n");
877 return AVERROR_INVALIDDATA;
880 /* Average frame size in bytes */
881 s->avg_frame_size = get_bits(&gb, 11) + 1;
883 superframe_idx = get_bits(&gb, 2);
884 if (superframe_idx & 1) {
885 av_log(avctx, AV_LOG_ERROR, "Invalid superframe index!\n");
886 return AVERROR_INVALIDDATA;
889 s->frame_count = 1 << superframe_idx;
890 s->frame_log2 = at9_tab_sri_frame_log2[s->samplerate_idx];
892 if (ff_mdct_init(&s->imdct, s->frame_log2 + 1, 1, 1.0f / 32768.0f))
893 return AVERROR(ENOMEM);
895 s->fdsp = avpriv_float_dsp_alloc(avctx->flags & AV_CODEC_FLAG_BITEXACT);
897 return AVERROR(ENOMEM);
900 for (int i = 0; i < (1 << s->frame_log2); i++) {
901 const int len = 1 << s->frame_log2;
902 const float sidx = ( i + 0.5f) / len;
903 const float eidx = (len - i - 0.5f) / len;
904 const float s_c = sinf(sidx*M_PI - M_PI_2)*0.5f + 0.5f;
905 const float e_c = sinf(eidx*M_PI - M_PI_2)*0.5f + 0.5f;
906 s->imdct_win[i] = s_c / ((s_c * s_c) + (e_c * e_c));
909 /* Allocation curve */
910 alloc_c_len = FF_ARRAY_ELEMS(at9_tab_b_dist);
911 for (int i = 1; i <= alloc_c_len; i++)
912 for (int j = 0; j < i; j++)
913 s->alloc_curve[i - 1][j] = at9_tab_b_dist[(j * alloc_c_len) / i];
915 /* Unsigned scalefactor VLCs */
916 for (int i = 1; i < 7; i++) {
917 const HuffmanCodebook *hf = &at9_huffman_sf_unsigned[i];
919 init_vlc(&s->sf_vlc[0][i], 9, hf->size, hf->bits, 1, 1, hf->codes,
923 /* Signed scalefactor VLCs */
924 for (int i = 2; i < 6; i++) {
925 const HuffmanCodebook *hf = &at9_huffman_sf_signed[i];
929 for (int j = 0; j < nums; j++)
930 sym[j] = sign_extend(j, hf->value_bits);
932 ff_init_vlc_sparse(&s->sf_vlc[1][i], 9, hf->size, hf->bits, 1, 1,
933 hf->codes, 2, 2, sym, sizeof(*sym), sizeof(*sym), 0);
936 /* Coefficient VLCs */
937 for (int i = 0; i < 2; i++) {
938 for (int j = 0; j < 8; j++) {
939 for (int k = 0; k < 4; k++) {
940 const HuffmanCodebook *hf = &at9_huffman_coeffs[i][j][k];
941 init_vlc(&s->coeff_vlc[i][j][k], 9, hf->size, hf->bits, 1, 1,
950 AVCodec ff_atrac9_decoder = {
952 .long_name = NULL_IF_CONFIG_SMALL("ATRAC9 (Adaptive TRansform Acoustic Coding 9)"),
953 .type = AVMEDIA_TYPE_AUDIO,
954 .id = AV_CODEC_ID_ATRAC9,
955 .priv_data_size = sizeof(ATRAC9Context),
956 .init = atrac9_decode_init,
957 .close = atrac9_decode_close,
958 .decode = atrac9_decode_frame,
959 .flush = atrac9_decode_flush,
960 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE | FF_CODEC_CAP_INIT_CLEANUP,
961 .capabilities = AV_CODEC_CAP_SUBFRAMES | AV_CODEC_CAP_DR1,