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 if (b->q_unit_cnt < 13)
206 return AVERROR_INVALIDDATA;
207 ext_band = at9_tab_band_ext_group[b->q_unit_cnt - 13][2];
209 b->channel[1].band_ext = get_bits(gb, 2);
210 b->channel[1].band_ext = ext_band > 2 ? b->channel[1].band_ext : 4;
216 b->has_band_ext_data = get_bits1(gb);
217 if (!b->has_band_ext_data)
220 if (!b->has_band_ext) {
222 skip_bits_long(gb, get_bits(gb, 5));
226 b->channel[0].band_ext = get_bits(gb, 2);
227 b->channel[0].band_ext = ext_band > 2 ? b->channel[0].band_ext : 4;
229 if (!get_bits(gb, 5))
232 for (int i = 0; i <= stereo; i++) {
233 ATRAC9ChannelData *c = &b->channel[i];
234 const int count = at9_tab_band_ext_cnt[c->band_ext][ext_band];
235 for (int j = 0; j < count; j++) {
236 int len = at9_tab_band_ext_lengths[c->band_ext][ext_band][j];
237 c->band_ext_data[j] = get_bits(gb, len);
244 static inline int read_scalefactors(ATRAC9Context *s, ATRAC9BlockData *b,
245 ATRAC9ChannelData *c, GetBitContext *gb,
246 int channel_idx, int first_in_pkt)
248 static const uint8_t mode_map[2][4] = { { 0, 1, 2, 3 }, { 0, 2, 3, 4 } };
249 const int mode = mode_map[channel_idx][get_bits(gb, 2)];
251 memset(c->scalefactors, 0, sizeof(c->scalefactors));
253 if (first_in_pkt && (mode == 4 || ((mode == 3) && !channel_idx))) {
254 av_log(s->avctx, AV_LOG_ERROR, "Invalid scalefactor coding mode!\n");
255 return AVERROR_INVALIDDATA;
259 case 0: { /* VLC delta offset */
260 const uint8_t *sf_weights = at9_tab_sf_weights[get_bits(gb, 3)];
261 const int base = get_bits(gb, 5);
262 const int len = get_bits(gb, 2) + 3;
263 const VLC *tab = &s->sf_vlc[0][len];
265 c->scalefactors[0] = get_bits(gb, len);
267 for (int i = 1; i < b->band_ext_q_unit; i++) {
268 int val = c->scalefactors[i - 1] + get_vlc2(gb, tab->table, 9, 2);
269 c->scalefactors[i] = val & ((1 << len) - 1);
272 for (int i = 0; i < b->band_ext_q_unit; i++)
273 c->scalefactors[i] += base - sf_weights[i];
277 case 1: { /* CLC offset */
278 const int len = get_bits(gb, 2) + 2;
279 const int base = len < 5 ? get_bits(gb, 5) : 0;
280 for (int i = 0; i < b->band_ext_q_unit; i++)
281 c->scalefactors[i] = base + get_bits(gb, len);
285 case 4: { /* VLC dist to baseline */
286 const int *baseline = mode == 4 ? c->scalefactors_prev :
287 channel_idx ? b->channel[0].scalefactors :
288 c->scalefactors_prev;
289 const int baseline_len = mode == 4 ? b->q_unit_cnt_prev :
290 channel_idx ? b->band_ext_q_unit :
293 const int len = get_bits(gb, 2) + 2;
294 const int unit_cnt = FFMIN(b->band_ext_q_unit, baseline_len);
295 const VLC *tab = &s->sf_vlc[1][len];
297 for (int i = 0; i < unit_cnt; i++) {
298 int dist = get_vlc2(gb, tab->table, 9, 2);
299 c->scalefactors[i] = baseline[i] + dist;
302 for (int i = unit_cnt; i < b->band_ext_q_unit; i++)
303 c->scalefactors[i] = get_bits(gb, 5);
307 case 3: { /* VLC offset with baseline */
308 const int *baseline = channel_idx ? b->channel[0].scalefactors :
309 c->scalefactors_prev;
310 const int baseline_len = channel_idx ? b->band_ext_q_unit :
313 const int base = get_bits(gb, 5) - (1 << (5 - 1));
314 const int len = get_bits(gb, 2) + 1;
315 const int unit_cnt = FFMIN(b->band_ext_q_unit, baseline_len);
316 const VLC *tab = &s->sf_vlc[0][len];
318 c->scalefactors[0] = get_bits(gb, len);
320 for (int i = 1; i < unit_cnt; i++) {
321 int val = c->scalefactors[i - 1] + get_vlc2(gb, tab->table, 9, 2);
322 c->scalefactors[i] = val & ((1 << len) - 1);
325 for (int i = 0; i < unit_cnt; i++)
326 c->scalefactors[i] += base + baseline[i];
328 for (int i = unit_cnt; i < b->band_ext_q_unit; i++)
329 c->scalefactors[i] = get_bits(gb, 5);
334 for (int i = 0; i < b->band_ext_q_unit; i++)
335 if (c->scalefactors[i] < 0 || c->scalefactors[i] > 31)
336 return AVERROR_INVALIDDATA;
338 memcpy(c->scalefactors_prev, c->scalefactors, sizeof(c->scalefactors));
343 static inline void calc_codebook_idx(ATRAC9Context *s, ATRAC9BlockData *b,
344 ATRAC9ChannelData *c)
347 const int last_sf = c->scalefactors[c->q_unit_cnt];
349 memset(c->codebookset, 0, sizeof(c->codebookset));
351 if (c->q_unit_cnt <= 1)
353 if (s->samplerate_idx > 7)
356 c->scalefactors[c->q_unit_cnt] = c->scalefactors[c->q_unit_cnt - 1];
358 if (c->q_unit_cnt > 12) {
359 for (int i = 0; i < 12; i++)
360 avg += c->scalefactors[i];
361 avg = (avg + 6) / 12;
364 for (int i = 8; i < c->q_unit_cnt; i++) {
365 const int prev = c->scalefactors[i - 1];
366 const int cur = c->scalefactors[i ];
367 const int next = c->scalefactors[i + 1];
368 const int min = FFMIN(prev, next);
369 if ((cur - min >= 3 || 2*cur - prev - next >= 3))
370 c->codebookset[i] = 1;
374 for (int i = 12; i < c->q_unit_cnt; i++) {
375 const int cur = c->scalefactors[i];
376 const int cnd = at9_q_unit_to_coeff_cnt[i] == 16;
377 const int min = FFMIN(c->scalefactors[i + 1], c->scalefactors[i - 1]);
378 if (c->codebookset[i])
381 c->codebookset[i] = (((cur - min) >= 2) && (cur >= (avg - cnd)));
384 c->scalefactors[c->q_unit_cnt] = last_sf;
387 static inline void read_coeffs_coarse(ATRAC9Context *s, ATRAC9BlockData *b,
388 ATRAC9ChannelData *c, GetBitContext *gb)
390 const int max_prec = s->samplerate_idx > 7 ? 1 : 7;
392 memset(c->q_coeffs_coarse, 0, sizeof(c->q_coeffs_coarse));
394 for (int i = 0; i < c->q_unit_cnt; i++) {
395 int *coeffs = &c->q_coeffs_coarse[at9_q_unit_to_coeff_idx[i]];
396 const int bands = at9_q_unit_to_coeff_cnt[i];
397 const int prec = c->precision_coarse[i] + 1;
399 if (prec <= max_prec) {
400 const int cb = c->codebookset[i];
401 const int cbi = at9_q_unit_to_codebookidx[i];
402 const VLC *tab = &s->coeff_vlc[cb][prec][cbi];
403 const HuffmanCodebook *huff = &at9_huffman_coeffs[cb][prec][cbi];
404 const int groups = bands >> huff->value_cnt_pow;
406 for (int j = 0; j < groups; j++) {
407 uint16_t val = get_vlc2(gb, tab->table, 9, huff->max_bit_size);
409 for (int k = 0; k < huff->value_cnt; k++) {
410 coeffs[k] = sign_extend(val, huff->value_bits);
411 val >>= huff->value_bits;
414 coeffs += huff->value_cnt;
417 for (int j = 0; j < bands; j++)
418 coeffs[j] = sign_extend(get_bits(gb, prec), prec);
423 static inline void read_coeffs_fine(ATRAC9Context *s, ATRAC9BlockData *b,
424 ATRAC9ChannelData *c, GetBitContext *gb)
426 memset(c->q_coeffs_fine, 0, sizeof(c->q_coeffs_fine));
428 for (int i = 0; i < c->q_unit_cnt; i++) {
429 const int start = at9_q_unit_to_coeff_idx[i + 0];
430 const int end = at9_q_unit_to_coeff_idx[i + 1];
431 const int len = c->precision_fine[i] + 1;
433 if (c->precision_fine[i] <= 0)
436 for (int j = start; j < end; j++)
437 c->q_coeffs_fine[j] = sign_extend(get_bits(gb, len), len);
441 static inline void dequantize(ATRAC9Context *s, ATRAC9BlockData *b,
442 ATRAC9ChannelData *c)
444 memset(c->coeffs, 0, sizeof(c->coeffs));
446 for (int i = 0; i < c->q_unit_cnt; i++) {
447 const int start = at9_q_unit_to_coeff_idx[i + 0];
448 const int end = at9_q_unit_to_coeff_idx[i + 1];
450 const float coarse_c = at9_quant_step_coarse[c->precision_coarse[i]];
451 const float fine_c = at9_quant_step_fine[c->precision_fine[i]];
453 for (int j = start; j < end; j++) {
454 const float vc = c->q_coeffs_coarse[j] * coarse_c;
455 const float vf = c->q_coeffs_fine[j] * fine_c;
456 c->coeffs[j] = vc + vf;
461 static inline void apply_intensity_stereo(ATRAC9Context *s, ATRAC9BlockData *b,
464 float *src = b->channel[ b->cpe_base_channel].coeffs;
465 float *dst = b->channel[!b->cpe_base_channel].coeffs;
470 if (b->q_unit_cnt <= b->stereo_q_unit)
473 for (int i = b->stereo_q_unit; i < b->q_unit_cnt; i++) {
474 const int sign = b->is_signs[i];
475 const int start = at9_q_unit_to_coeff_idx[i + 0];
476 const int end = at9_q_unit_to_coeff_idx[i + 1];
477 for (int j = start; j < end; j++)
478 dst[j] = sign*src[j];
482 static inline void apply_scalefactors(ATRAC9Context *s, ATRAC9BlockData *b,
485 for (int i = 0; i <= stereo; i++) {
486 float *coeffs = b->channel[i].coeffs;
487 for (int j = 0; j < b->q_unit_cnt; j++) {
488 const int start = at9_q_unit_to_coeff_idx[j + 0];
489 const int end = at9_q_unit_to_coeff_idx[j + 1];
490 const int scalefactor = b->channel[i].scalefactors[j];
491 const float scale = at9_scalefactor_c[scalefactor];
492 for (int k = start; k < end; k++)
498 static inline void fill_with_noise(ATRAC9Context *s, ATRAC9ChannelData *c,
499 int start, int count)
502 for (int i = 0; i < count; i += 2) {
504 av_bmg_get(&s->lfg, tmp);
505 c->coeffs[start + i + 0] = tmp[0];
506 c->coeffs[start + i + 1] = tmp[1];
507 maxval = FFMAX(FFMAX(FFABS(tmp[0]), FFABS(tmp[1])), maxval);
510 for (int i = 0; i < count; i++)
511 c->coeffs[start + i] /= maxval;
514 static inline void scale_band_ext_coeffs(ATRAC9ChannelData *c, float sf[6],
515 const int s_unit, const int e_unit)
517 for (int i = s_unit; i < e_unit; i++) {
518 const int start = at9_q_unit_to_coeff_idx[i + 0];
519 const int end = at9_q_unit_to_coeff_idx[i + 1];
520 for (int j = start; j < end; j++)
521 c->coeffs[j] *= sf[i - s_unit];
525 static inline void apply_band_extension(ATRAC9Context *s, ATRAC9BlockData *b,
528 const int g_units[4] = { /* A, B, C, total units */
530 at9_tab_band_ext_group[b->q_unit_cnt - 13][0],
531 at9_tab_band_ext_group[b->q_unit_cnt - 13][1],
532 FFMAX(g_units[2], 22),
535 const int g_bins[4] = { /* A, B, C, total bins */
536 at9_q_unit_to_coeff_idx[g_units[0]],
537 at9_q_unit_to_coeff_idx[g_units[1]],
538 at9_q_unit_to_coeff_idx[g_units[2]],
539 at9_q_unit_to_coeff_idx[g_units[3]],
542 for (int ch = 0; ch <= stereo; ch++) {
543 ATRAC9ChannelData *c = &b->channel[ch];
545 /* Mirror the spectrum */
546 for (int i = 0; i < 3; i++)
547 for (int j = 0; j < (g_bins[i + 1] - g_bins[i + 0]); j++)
548 c->coeffs[g_bins[i] + j] = c->coeffs[g_bins[i] - j - 1];
550 switch (c->band_ext) {
552 float sf[6] = { 0.0f };
553 const int l = g_units[3] - g_units[0] - 1;
554 const int n_start = at9_q_unit_to_coeff_idx[g_units[3] - 1];
555 const int n_cnt = at9_q_unit_to_coeff_cnt[g_units[3] - 1];
556 switch (at9_tab_band_ext_group[b->q_unit_cnt - 13][2]) {
558 sf[0] = at9_band_ext_scales_m0[0][0][c->band_ext_data[0]];
559 sf[1] = at9_band_ext_scales_m0[0][1][c->band_ext_data[0]];
560 sf[2] = at9_band_ext_scales_m0[0][2][c->band_ext_data[1]];
561 sf[3] = at9_band_ext_scales_m0[0][3][c->band_ext_data[2]];
562 sf[4] = at9_band_ext_scales_m0[0][4][c->band_ext_data[3]];
565 sf[0] = at9_band_ext_scales_m0[1][0][c->band_ext_data[0]];
566 sf[1] = at9_band_ext_scales_m0[1][1][c->band_ext_data[0]];
567 sf[2] = at9_band_ext_scales_m0[1][2][c->band_ext_data[1]];
568 sf[3] = at9_band_ext_scales_m0[1][3][c->band_ext_data[2]];
569 sf[4] = at9_band_ext_scales_m0[1][4][c->band_ext_data[3]];
572 sf[0] = at9_band_ext_scales_m0[2][0][c->band_ext_data[0]];
573 sf[1] = at9_band_ext_scales_m0[2][1][c->band_ext_data[1]];
574 sf[2] = at9_band_ext_scales_m0[2][2][c->band_ext_data[1]];
578 sf[l] = at9_scalefactor_c[c->scalefactors[g_units[0]]];
580 fill_with_noise(s, c, n_start, n_cnt);
581 scale_band_ext_coeffs(c, sf, g_units[0], g_units[3]);
586 for (int i = g_units[0]; i < g_units[3]; i++)
587 sf[i - g_units[0]] = at9_scalefactor_c[c->scalefactors[i]];
589 fill_with_noise(s, c, g_bins[0], g_bins[3] - g_bins[0]);
590 scale_band_ext_coeffs(c, sf, g_units[0], g_units[3]);
594 const float g_sf[2] = {
595 at9_band_ext_scales_m2[c->band_ext_data[0]],
596 at9_band_ext_scales_m2[c->band_ext_data[1]],
599 for (int i = 0; i < 2; i++)
600 for (int j = g_bins[i + 0]; j < g_bins[i + 1]; j++)
601 c->coeffs[j] *= g_sf[i];
605 float scale = at9_band_ext_scales_m3[c->band_ext_data[0]][0];
606 float rate = at9_band_ext_scales_m3[c->band_ext_data[1]][1];
608 for (int i = g_bins[0]; i < g_bins[3]; i++) {
610 c->coeffs[i] *= scale;
615 const float m = at9_band_ext_scales_m4[c->band_ext_data[0]];
616 const float g_sf[3] = { 0.7079468f*m, 0.5011902f*m, 0.3548279f*m };
618 for (int i = 0; i < 3; i++)
619 for (int j = g_bins[i + 0]; j < g_bins[i + 1]; j++)
620 c->coeffs[j] *= g_sf[i];
627 static int atrac9_decode_block(ATRAC9Context *s, GetBitContext *gb,
628 ATRAC9BlockData *b, AVFrame *frame,
629 int frame_idx, int block_idx)
631 const int first_in_pkt = !get_bits1(gb);
632 const int reuse_params = get_bits1(gb);
633 const int stereo = s->block_config->type[block_idx] == ATRAC9_BLOCK_TYPE_CPE;
635 if (s->block_config->type[block_idx] == ATRAC9_BLOCK_TYPE_LFE) {
636 ATRAC9ChannelData *c = &b->channel[0];
637 const int precision = reuse_params ? 8 : 4;
638 c->q_unit_cnt = b->q_unit_cnt = 2;
640 memset(c->scalefactors, 0, sizeof(c->scalefactors));
641 memset(c->q_coeffs_fine, 0, sizeof(c->q_coeffs_fine));
642 memset(c->q_coeffs_coarse, 0, sizeof(c->q_coeffs_coarse));
644 for (int i = 0; i < b->q_unit_cnt; i++) {
645 c->scalefactors[i] = get_bits(gb, 5);
646 c->precision_coarse[i] = precision;
647 c->precision_fine[i] = 0;
650 for (int i = 0; i < c->q_unit_cnt; i++) {
651 const int start = at9_q_unit_to_coeff_idx[i + 0];
652 const int end = at9_q_unit_to_coeff_idx[i + 1];
653 for (int j = start; j < end; j++)
654 c->q_coeffs_coarse[j] = get_bits(gb, c->precision_coarse[i] + 1);
657 dequantize (s, b, c);
658 apply_scalefactors(s, b, 0);
663 if (first_in_pkt && reuse_params) {
664 av_log(s->avctx, AV_LOG_ERROR, "Invalid block flags!\n");
665 return AVERROR_INVALIDDATA;
668 /* Band parameters */
670 int stereo_band, ext_band;
671 const int min_band_count = s->samplerate_idx > 7 ? 1 : 3;
673 b->band_count = get_bits(gb, 4) + min_band_count;
674 b->q_unit_cnt = at9_tab_band_q_unit_map[b->band_count];
676 b->band_ext_q_unit = b->stereo_q_unit = b->q_unit_cnt;
678 if (b->band_count > at9_tab_sri_max_bands[s->samplerate_idx]) {
679 av_log(s->avctx, AV_LOG_ERROR, "Invalid band count %i!\n",
681 return AVERROR_INVALIDDATA;
685 stereo_band = get_bits(gb, 4) + min_band_count;
686 if (stereo_band > b->band_count) {
687 av_log(s->avctx, AV_LOG_ERROR, "Invalid stereo band %i!\n",
689 return AVERROR_INVALIDDATA;
691 b->stereo_q_unit = at9_tab_band_q_unit_map[stereo_band];
694 b->has_band_ext = get_bits1(gb);
695 if (b->has_band_ext) {
696 ext_band = get_bits(gb, 4) + min_band_count;
697 if (ext_band < b->band_count) {
698 av_log(s->avctx, AV_LOG_ERROR, "Invalid extension band %i!\n",
700 return AVERROR_INVALIDDATA;
702 b->band_ext_q_unit = at9_tab_band_q_unit_map[ext_band];
707 av_log(s->avctx, AV_LOG_ERROR, "invalid block reused!\n");
708 return AVERROR_INVALIDDATA;
711 /* Calculate bit alloc gradient */
712 if (parse_gradient(s, b, gb))
713 return AVERROR_INVALIDDATA;
716 b->cpe_base_channel = 0;
718 b->cpe_base_channel = get_bits1(gb);
720 for (int i = b->stereo_q_unit; i < b->q_unit_cnt; i++)
721 b->is_signs[i] = 1 - 2*get_bits1(gb);
723 for (int i = 0; i < FF_ARRAY_ELEMS(b->is_signs); i++)
729 if (parse_band_ext(s, b, gb, stereo))
730 return AVERROR_INVALIDDATA;
733 for (int i = 0; i <= stereo; i++) {
734 ATRAC9ChannelData *c = &b->channel[i];
735 c->q_unit_cnt = i == b->cpe_base_channel ? b->q_unit_cnt :
737 if (read_scalefactors(s, b, c, gb, i, first_in_pkt))
738 return AVERROR_INVALIDDATA;
740 calc_precision (s, b, c);
741 calc_codebook_idx (s, b, c);
742 read_coeffs_coarse(s, b, c, gb);
743 read_coeffs_fine (s, b, c, gb);
744 dequantize (s, b, c);
747 b->q_unit_cnt_prev = b->has_band_ext ? b->band_ext_q_unit : b->q_unit_cnt;
749 apply_intensity_stereo(s, b, stereo);
750 apply_scalefactors (s, b, stereo);
752 if (b->has_band_ext && b->has_band_ext_data)
753 apply_band_extension (s, b, stereo);
756 for (int i = 0; i <= stereo; i++) {
757 ATRAC9ChannelData *c = &b->channel[i];
758 const int dst_idx = s->block_config->plane_map[block_idx][i];
759 const int wsize = 1 << s->frame_log2;
760 const ptrdiff_t offset = wsize*frame_idx*sizeof(float);
761 float *dst = (float *)(frame->extended_data[dst_idx] + offset);
763 s->imdct.imdct_half(&s->imdct, s->temp, c->coeffs);
764 s->fdsp->vector_fmul_window(dst, c->prev_win, s->temp,
765 s->imdct_win, wsize >> 1);
766 memcpy(c->prev_win, s->temp + (wsize >> 1), sizeof(float)*wsize >> 1);
772 static int atrac9_decode_frame(AVCodecContext *avctx, void *data,
773 int *got_frame_ptr, AVPacket *avpkt)
777 AVFrame *frame = data;
778 ATRAC9Context *s = avctx->priv_data;
779 const int frames = FFMIN(avpkt->size / s->avg_frame_size, s->frame_count);
781 frame->nb_samples = (1 << s->frame_log2) * frames;
782 ret = ff_get_buffer(avctx, frame, 0);
786 init_get_bits8(&gb, avpkt->data, avpkt->size);
788 for (int i = 0; i < frames; i++) {
789 for (int j = 0; j < s->block_config->count; j++) {
790 ret = atrac9_decode_block(s, &gb, &s->block[j], frame, i, j);
799 return avctx->block_align;
802 static void atrac9_decode_flush(AVCodecContext *avctx)
804 ATRAC9Context *s = avctx->priv_data;
806 for (int j = 0; j < s->block_config->count; j++) {
807 ATRAC9BlockData *b = &s->block[j];
808 const int stereo = s->block_config->type[j] == ATRAC9_BLOCK_TYPE_CPE;
809 for (int i = 0; i <= stereo; i++) {
810 ATRAC9ChannelData *c = &b->channel[i];
811 memset(c->prev_win, 0, sizeof(c->prev_win));
816 static av_cold int atrac9_decode_close(AVCodecContext *avctx)
818 ATRAC9Context *s = avctx->priv_data;
820 for (int i = 1; i < 7; i++)
821 ff_free_vlc(&s->sf_vlc[0][i]);
822 for (int i = 2; i < 6; i++)
823 ff_free_vlc(&s->sf_vlc[1][i]);
824 for (int i = 0; i < 2; i++)
825 for (int j = 0; j < 8; j++)
826 for (int k = 0; k < 4; k++)
827 ff_free_vlc(&s->coeff_vlc[i][j][k]);
829 ff_mdct_end(&s->imdct);
835 static av_cold int atrac9_decode_init(AVCodecContext *avctx)
838 ATRAC9Context *s = avctx->priv_data;
839 int version, block_config_idx, superframe_idx, alloc_c_len;
843 av_lfg_init(&s->lfg, 0xFBADF00D);
845 if (avctx->extradata_size != 12) {
846 av_log(avctx, AV_LOG_ERROR, "Invalid extradata length!\n");
847 return AVERROR_INVALIDDATA;
850 version = AV_RL32(avctx->extradata);
852 av_log(avctx, AV_LOG_ERROR, "Unsupported version (%i)!\n", version);
853 return AVERROR_INVALIDDATA;
856 init_get_bits8(&gb, avctx->extradata + 4, avctx->extradata_size);
858 if (get_bits(&gb, 8) != 0xFE) {
859 av_log(avctx, AV_LOG_ERROR, "Incorrect magic byte!\n");
860 return AVERROR_INVALIDDATA;
863 s->samplerate_idx = get_bits(&gb, 4);
864 avctx->sample_rate = at9_tab_samplerates[s->samplerate_idx];
866 block_config_idx = get_bits(&gb, 3);
867 if (block_config_idx > 5) {
868 av_log(avctx, AV_LOG_ERROR, "Incorrect block config!\n");
869 return AVERROR_INVALIDDATA;
871 s->block_config = &at9_block_layout[block_config_idx];
873 avctx->channel_layout = s->block_config->channel_layout;
874 avctx->sample_fmt = AV_SAMPLE_FMT_FLTP;
876 if (get_bits1(&gb)) {
877 av_log(avctx, AV_LOG_ERROR, "Incorrect verification bit!\n");
878 return AVERROR_INVALIDDATA;
881 /* Average frame size in bytes */
882 s->avg_frame_size = get_bits(&gb, 11) + 1;
884 superframe_idx = get_bits(&gb, 2);
885 if (superframe_idx & 1) {
886 av_log(avctx, AV_LOG_ERROR, "Invalid superframe index!\n");
887 return AVERROR_INVALIDDATA;
890 s->frame_count = 1 << superframe_idx;
891 s->frame_log2 = at9_tab_sri_frame_log2[s->samplerate_idx];
893 if (ff_mdct_init(&s->imdct, s->frame_log2 + 1, 1, 1.0f / 32768.0f))
894 return AVERROR(ENOMEM);
896 s->fdsp = avpriv_float_dsp_alloc(avctx->flags & AV_CODEC_FLAG_BITEXACT);
898 return AVERROR(ENOMEM);
901 for (int i = 0; i < (1 << s->frame_log2); i++) {
902 const int len = 1 << s->frame_log2;
903 const float sidx = ( i + 0.5f) / len;
904 const float eidx = (len - i - 0.5f) / len;
905 const float s_c = sinf(sidx*M_PI - M_PI_2)*0.5f + 0.5f;
906 const float e_c = sinf(eidx*M_PI - M_PI_2)*0.5f + 0.5f;
907 s->imdct_win[i] = s_c / ((s_c * s_c) + (e_c * e_c));
910 /* Allocation curve */
911 alloc_c_len = FF_ARRAY_ELEMS(at9_tab_b_dist);
912 for (int i = 1; i <= alloc_c_len; i++)
913 for (int j = 0; j < i; j++)
914 s->alloc_curve[i - 1][j] = at9_tab_b_dist[(j * alloc_c_len) / i];
916 /* Unsigned scalefactor VLCs */
917 for (int i = 1; i < 7; i++) {
918 const HuffmanCodebook *hf = &at9_huffman_sf_unsigned[i];
920 init_vlc(&s->sf_vlc[0][i], 9, hf->size, hf->bits, 1, 1, hf->codes,
924 /* Signed scalefactor VLCs */
925 for (int i = 2; i < 6; i++) {
926 const HuffmanCodebook *hf = &at9_huffman_sf_signed[i];
930 for (int j = 0; j < nums; j++)
931 sym[j] = sign_extend(j, hf->value_bits);
933 ff_init_vlc_sparse(&s->sf_vlc[1][i], 9, hf->size, hf->bits, 1, 1,
934 hf->codes, 2, 2, sym, sizeof(*sym), sizeof(*sym), 0);
937 /* Coefficient VLCs */
938 for (int i = 0; i < 2; i++) {
939 for (int j = 0; j < 8; j++) {
940 for (int k = 0; k < 4; k++) {
941 const HuffmanCodebook *hf = &at9_huffman_coeffs[i][j][k];
942 init_vlc(&s->coeff_vlc[i][j][k], 9, hf->size, hf->bits, 1, 1,
951 AVCodec ff_atrac9_decoder = {
953 .long_name = NULL_IF_CONFIG_SMALL("ATRAC9 (Adaptive TRansform Acoustic Coding 9)"),
954 .type = AVMEDIA_TYPE_AUDIO,
955 .id = AV_CODEC_ID_ATRAC9,
956 .priv_data_size = sizeof(ATRAC9Context),
957 .init = atrac9_decode_init,
958 .close = atrac9_decode_close,
959 .decode = atrac9_decode_frame,
960 .flush = atrac9_decode_flush,
961 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE | FF_CODEC_CAP_INIT_CLEANUP,
962 .capabilities = AV_CODEC_CAP_SUBFRAMES | AV_CODEC_CAP_DR1,