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;
77 typedef struct ATRAC9Context {
78 AVCodecContext *avctx;
79 AVFloatDSPContext *fdsp;
81 ATRAC9BlockData block[5];
89 const ATRAC9BlockConfig *block_config;
91 /* Generated on init */
92 VLC sf_vlc[2][8]; /* Signed/unsigned, length */
93 VLC coeff_vlc[2][8][4]; /* Cookbook, precision, cookbook index */
94 uint8_t alloc_curve[48][48];
95 DECLARE_ALIGNED(32, float, imdct_win)[256];
97 DECLARE_ALIGNED(32, float, temp)[256];
100 static inline int parse_gradient(ATRAC9Context *s, ATRAC9BlockData *b,
105 int values, sign, base;
109 b->grad_mode = get_bits(gb, 2);
111 grad_range[0] = get_bits(gb, 5);
113 grad_value[0] = get_bits(gb, 5);
116 grad_range[0] = get_bits(gb, 6);
117 grad_range[1] = get_bits(gb, 6) + 1;
118 grad_value[0] = get_bits(gb, 5);
119 grad_value[1] = get_bits(gb, 5);
121 b->grad_boundary = get_bits(gb, 4);
123 if (grad_range[0] >= grad_range[1] || grad_range[1] > 47)
124 return AVERROR_INVALIDDATA;
126 if (grad_value[0] >= grad_value[1] || grad_value[1] >= 32)
127 return AVERROR_INVALIDDATA;
129 if (b->grad_boundary > b->q_unit_cnt)
130 return AVERROR_INVALIDDATA;
132 values = grad_value[1] - grad_value[0];
133 sign = 1 - 2*(values < 0);
134 base = grad_value[0] + sign;
135 scale = (FFABS(values) - 1) / 31.0f;
136 curve = s->alloc_curve[grad_range[1] - grad_range[0] - 1];
138 for (int i = 0; i <= b->q_unit_cnt; i++)
139 b->gradient[i] = grad_value[i >= grad_range[0]];
141 for (int i = grad_range[0]; i < grad_range[1]; i++)
142 b->gradient[i] = base + sign*((int)(scale*curve[i - grad_range[0]]));
147 static inline void calc_precision(ATRAC9Context *s, ATRAC9BlockData *b,
148 ATRAC9ChannelData *c)
150 memset(c->precision_mask, 0, sizeof(c->precision_mask));
151 for (int i = 1; i < b->q_unit_cnt; i++) {
152 const int delta = FFABS(c->scalefactors[i] - c->scalefactors[i - 1]) - 1;
154 const int neg = c->scalefactors[i - 1] > c->scalefactors[i];
155 c->precision_mask[i - neg] += FFMIN(delta, 5);
160 for (int i = 0; i < b->q_unit_cnt; i++) {
161 c->precision_coarse[i] = c->scalefactors[i];
162 c->precision_coarse[i] += c->precision_mask[i] - b->gradient[i];
163 if (c->precision_coarse[i] < 0)
165 switch (b->grad_mode) {
167 c->precision_coarse[i] >>= 1;
170 c->precision_coarse[i] = (3 * c->precision_coarse[i]) >> 3;
173 c->precision_coarse[i] >>= 2;
178 for (int i = 0; i < b->q_unit_cnt; i++)
179 c->precision_coarse[i] = c->scalefactors[i] - b->gradient[i];
183 for (int i = 0; i < b->q_unit_cnt; i++)
184 c->precision_coarse[i] = FFMAX(c->precision_coarse[i], 1);
186 for (int i = 0; i < b->grad_boundary; i++)
187 c->precision_coarse[i]++;
189 for (int i = 0; i < b->q_unit_cnt; i++) {
190 c->precision_fine[i] = 0;
191 if (c->precision_coarse[i] > 15) {
192 c->precision_fine[i] = c->precision_coarse[i] - 15;
193 c->precision_coarse[i] = 15;
198 static inline int parse_band_ext(ATRAC9Context *s, ATRAC9BlockData *b,
199 GetBitContext *gb, int stereo)
203 if (b->has_band_ext) {
204 ext_band = at9_tab_band_ext_group[b->q_unit_cnt - 13][2];
206 b->channel[1].band_ext = get_bits(gb, 2);
207 b->channel[1].band_ext = ext_band > 2 ? b->channel[1].band_ext : 4;
213 b->has_band_ext_data = get_bits1(gb);
214 if (!b->has_band_ext_data)
217 if (!b->has_band_ext) {
218 b->band_ext_mode = get_bits(gb, 2);
219 skip_bits_long(gb, get_bits(gb, 5));
223 b->channel[0].band_ext = get_bits(gb, 2);
224 b->channel[0].band_ext = ext_band > 2 ? b->channel[0].band_ext : 4;
226 if (!get_bits(gb, 5))
229 for (int i = 0; i <= stereo; i++) {
230 ATRAC9ChannelData *c = &b->channel[i];
231 const int count = at9_tab_band_ext_cnt[c->band_ext][ext_band];
232 for (int j = 0; j < count; j++) {
233 int len = at9_tab_band_ext_lengths[c->band_ext][ext_band][j];
234 c->band_ext_data[j] = get_bits(gb, len);
241 static inline int read_scalefactors(ATRAC9Context *s, ATRAC9BlockData *b,
242 ATRAC9ChannelData *c, GetBitContext *gb,
243 int channel_idx, int first_in_pkt)
245 static const int mode_map[2][4] = { { 0, 1, 2, 3 }, { 0, 2, 3, 4 } };
246 const int mode = mode_map[channel_idx][get_bits(gb, 2)];
248 memset(c->scalefactors, 0, sizeof(c->scalefactors));
250 if (first_in_pkt && (mode == 4 || ((mode == 3) && !channel_idx))) {
251 av_log(s->avctx, AV_LOG_ERROR, "Invalid scalefactor coding mode!\n");
252 return AVERROR_INVALIDDATA;
256 case 0: { /* VLC delta offset */
257 const uint8_t *sf_weights = at9_tab_sf_weights[get_bits(gb, 3)];
258 const int base = get_bits(gb, 5);
259 const int len = get_bits(gb, 2) + 3;
260 const VLC *tab = &s->sf_vlc[0][len];
262 c->scalefactors[0] = get_bits(gb, len);
264 for (int i = 1; i < b->band_ext_q_unit; i++) {
265 int val = c->scalefactors[i - 1] + get_vlc2(gb, tab->table, 9, 2);
266 c->scalefactors[i] = val & ((1 << len) - 1);
269 for (int i = 0; i < b->band_ext_q_unit; i++)
270 c->scalefactors[i] += base - sf_weights[i];
274 case 1: { /* CLC offset */
275 const int len = get_bits(gb, 2) + 2;
276 const int base = len < 5 ? get_bits(gb, 5) : 0;
277 for (int i = 0; i < b->band_ext_q_unit; i++)
278 c->scalefactors[i] = base + get_bits(gb, len);
282 case 4: { /* VLC dist to baseline */
283 const int *baseline = mode == 4 ? c->scalefactors_prev :
284 channel_idx ? b->channel[0].scalefactors :
285 c->scalefactors_prev;
286 const int baseline_len = mode == 4 ? b->q_unit_cnt_prev :
287 channel_idx ? b->band_ext_q_unit :
290 const int len = get_bits(gb, 2) + 2;
291 const int unit_cnt = FFMIN(b->band_ext_q_unit, baseline_len);
292 const VLC *tab = &s->sf_vlc[1][len];
294 for (int i = 0; i < unit_cnt; i++) {
295 int dist = get_vlc2(gb, tab->table, 9, 2);
296 c->scalefactors[i] = baseline[i] + dist;
299 for (int i = unit_cnt; i < b->band_ext_q_unit; i++)
300 c->scalefactors[i] = get_bits(gb, 5);
304 case 3: { /* VLC offset with baseline */
305 const int *baseline = channel_idx ? b->channel[0].scalefactors :
306 c->scalefactors_prev;
307 const int baseline_len = channel_idx ? b->band_ext_q_unit :
310 const int base = get_bits(gb, 5) - (1 << (5 - 1));
311 const int len = get_bits(gb, 2) + 1;
312 const int unit_cnt = FFMIN(b->band_ext_q_unit, baseline_len);
313 const VLC *tab = &s->sf_vlc[0][len];
315 c->scalefactors[0] = get_bits(gb, len);
317 for (int i = 1; i < unit_cnt; i++) {
318 int val = c->scalefactors[i - 1] + get_vlc2(gb, tab->table, 9, 2);
319 c->scalefactors[i] = val & ((1 << len) - 1);
322 for (int i = 0; i < unit_cnt; i++)
323 c->scalefactors[i] += base + baseline[i];
325 for (int i = unit_cnt; i < b->band_ext_q_unit; i++)
326 c->scalefactors[i] = get_bits(gb, 5);
331 for (int i = 0; i < b->band_ext_q_unit; i++)
332 if (c->scalefactors[i] < 0 || c->scalefactors[i] > 31)
333 return AVERROR_INVALIDDATA;
335 memcpy(c->scalefactors_prev, c->scalefactors, sizeof(c->scalefactors));
340 static inline void calc_codebook_idx(ATRAC9Context *s, ATRAC9BlockData *b,
341 ATRAC9ChannelData *c)
344 const int last_sf = c->scalefactors[c->q_unit_cnt];
346 memset(c->codebookset, 0, sizeof(c->codebookset));
348 if (c->q_unit_cnt <= 1)
350 if (s->samplerate_idx > 7)
353 c->scalefactors[c->q_unit_cnt] = c->scalefactors[c->q_unit_cnt - 1];
355 if (c->q_unit_cnt > 12) {
356 for (int i = 0; i < 12; i++)
357 avg += c->scalefactors[i];
358 avg = (avg + 6) / 12;
361 for (int i = 8; i < c->q_unit_cnt; i++) {
362 const int prev = c->scalefactors[i - 1];
363 const int cur = c->scalefactors[i ];
364 const int next = c->scalefactors[i + 1];
365 const int min = FFMIN(prev, next);
366 if ((cur - min >= 3 || 2*cur - prev - next >= 3))
367 c->codebookset[i] = 1;
371 for (int i = 12; i < c->q_unit_cnt; i++) {
372 const int cur = c->scalefactors[i];
373 const int cnd = at9_q_unit_to_coeff_cnt[i] == 16;
374 const int min = FFMIN(c->scalefactors[i + 1], c->scalefactors[i - 1]);
375 if (c->codebookset[i])
378 c->codebookset[i] = (((cur - min) >= 2) && (cur >= (avg - cnd)));
381 c->scalefactors[c->q_unit_cnt] = last_sf;
384 static inline void read_coeffs_coarse(ATRAC9Context *s, ATRAC9BlockData *b,
385 ATRAC9ChannelData *c, GetBitContext *gb)
387 const int max_prec = s->samplerate_idx > 7 ? 1 : 7;
389 memset(c->q_coeffs_coarse, 0, sizeof(c->q_coeffs_coarse));
391 for (int i = 0; i < c->q_unit_cnt; i++) {
392 int *coeffs = &c->q_coeffs_coarse[at9_q_unit_to_coeff_idx[i]];
393 const int bands = at9_q_unit_to_coeff_cnt[i];
394 const int prec = c->precision_coarse[i] + 1;
396 if (prec <= max_prec) {
397 const int cb = c->codebookset[i];
398 const int cbi = at9_q_unit_to_codebookidx[i];
399 const VLC *tab = &s->coeff_vlc[cb][prec][cbi];
400 const HuffmanCodebook *huff = &at9_huffman_coeffs[cb][prec][cbi];
401 const int groups = bands >> huff->value_cnt_pow;
403 for (int j = 0; j < groups; j++) {
404 uint16_t val = get_vlc2(gb, tab->table, 9, huff->max_bit_size);
406 for (int k = 0; k < huff->value_cnt; k++) {
407 coeffs[k] = sign_extend(val, huff->value_bits);
408 val >>= huff->value_bits;
411 coeffs += huff->value_cnt;
414 for (int j = 0; j < bands; j++)
415 coeffs[j] = sign_extend(get_bits(gb, prec), prec);
420 static inline void read_coeffs_fine(ATRAC9Context *s, ATRAC9BlockData *b,
421 ATRAC9ChannelData *c, GetBitContext *gb)
423 memset(c->q_coeffs_fine, 0, sizeof(c->q_coeffs_fine));
425 for (int i = 0; i < c->q_unit_cnt; i++) {
426 const int start = at9_q_unit_to_coeff_idx[i + 0];
427 const int end = at9_q_unit_to_coeff_idx[i + 1];
428 const int len = c->precision_fine[i] + 1;
430 if (c->precision_fine[i] <= 0)
433 for (int j = start; j < end; j++)
434 c->q_coeffs_fine[j] = sign_extend(get_bits(gb, len), len);
438 static inline void dequantize(ATRAC9Context *s, ATRAC9BlockData *b,
439 ATRAC9ChannelData *c)
441 memset(c->coeffs, 0, sizeof(c->coeffs));
443 for (int i = 0; i < c->q_unit_cnt; i++) {
444 const int start = at9_q_unit_to_coeff_idx[i + 0];
445 const int end = at9_q_unit_to_coeff_idx[i + 1];
447 const float coarse_c = at9_quant_step_coarse[c->precision_coarse[i]];
448 const float fine_c = at9_quant_step_fine[c->precision_fine[i]];
450 for (int j = start; j < end; j++) {
451 const float vc = c->q_coeffs_coarse[j] * coarse_c;
452 const float vf = c->q_coeffs_fine[j] * fine_c;
453 c->coeffs[j] = vc + vf;
458 static inline void apply_intensity_stereo(ATRAC9Context *s, ATRAC9BlockData *b,
461 float *src = b->channel[ b->cpe_base_channel].coeffs;
462 float *dst = b->channel[!b->cpe_base_channel].coeffs;
467 if (b->q_unit_cnt <= b->stereo_q_unit)
470 for (int i = b->stereo_q_unit; i < b->q_unit_cnt; i++) {
471 const int sign = b->is_signs[i];
472 const int start = at9_q_unit_to_coeff_idx[i + 0];
473 const int end = at9_q_unit_to_coeff_idx[i + 1];
474 for (int j = start; j < end; j++)
475 dst[j] = sign*src[j];
479 static inline void apply_scalefactors(ATRAC9Context *s, ATRAC9BlockData *b,
482 for (int i = 0; i <= stereo; i++) {
483 float *coeffs = b->channel[i].coeffs;
484 for (int j = 0; j < b->q_unit_cnt; j++) {
485 const int start = at9_q_unit_to_coeff_idx[j + 0];
486 const int end = at9_q_unit_to_coeff_idx[j + 1];
487 const int scalefactor = b->channel[i].scalefactors[j];
488 const float scale = at9_scalefactor_c[scalefactor];
489 for (int k = start; k < end; k++)
495 static inline void fill_with_noise(ATRAC9Context *s, ATRAC9ChannelData *c,
496 int start, int count)
499 for (int i = 0; i < count; i += 2) {
501 av_bmg_get(&s->lfg, tmp);
502 c->coeffs[start + i + 0] = tmp[0];
503 c->coeffs[start + i + 1] = tmp[1];
504 maxval = FFMAX(FFABS(tmp[0]), FFMAX(FFABS(tmp[1]), maxval));
507 for (int i = 0; i < count; i++)
508 c->coeffs[start + i] /= maxval;
511 static inline void scale_band_ext_coeffs(ATRAC9ChannelData *c, float sf[6],
512 const int s_unit, const int e_unit)
514 for (int i = s_unit; i < e_unit; i++) {
515 const int start = at9_q_unit_to_coeff_idx[i + 0];
516 const int end = at9_q_unit_to_coeff_idx[i + 1];
517 for (int j = start; j < end; j++)
518 c->coeffs[j] *= sf[i - s_unit];
522 static inline void apply_band_extension(ATRAC9Context *s, ATRAC9BlockData *b,
525 const int bc = at9_tab_band_ext_group[b->q_unit_cnt - 13][2];
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) {
554 float sf[6] = { 0.0f };
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];
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 l = g_units[3] - g_units[0] - 1;
580 sf[l] = at9_scalefactor_c[c->scalefactors[g_units[0]]];
582 fill_with_noise(s, c, n_start, n_cnt);
583 scale_band_ext_coeffs(c, sf, g_units[0], g_units[3]);
588 for (int i = g_units[0]; i < g_units[3]; i++)
589 sf[i - g_units[0]] = at9_scalefactor_c[c->scalefactors[i]];
591 fill_with_noise(s, c, g_bins[0], g_bins[3] - g_bins[0]);
592 scale_band_ext_coeffs(c, sf, g_units[0], g_units[3]);
596 const float g_sf[2] = {
597 at9_band_ext_scales_m2[c->band_ext_data[0]],
598 at9_band_ext_scales_m2[c->band_ext_data[1]],
601 for (int i = 0; i < 2; i++)
602 for (int j = g_bins[i + 0]; j < g_bins[i + 1]; j++)
603 c->coeffs[j] *= g_sf[i];
607 float scale = at9_band_ext_scales_m3[c->band_ext_data[0]][0];
608 float rate = at9_band_ext_scales_m3[c->band_ext_data[1]][1];
610 for (int i = g_bins[0]; i < g_bins[3]; i++) {
612 c->coeffs[i] *= scale;
617 const float m = at9_band_ext_scales_m4[c->band_ext_data[0]];
618 const float g_sf[3] = { 0.7079468f*m, 0.5011902f*m, 0.3548279f*m };
620 for (int i = 0; i < 3; i++)
621 for (int j = g_bins[i + 0]; j < g_bins[i + 1]; j++)
622 c->coeffs[j] *= g_sf[i];
629 static int atrac9_decode_block(ATRAC9Context *s, GetBitContext *gb,
630 ATRAC9BlockData *b, AVFrame *frame,
631 int frame_idx, int block_idx)
633 const int first_in_pkt = !get_bits1(gb);
634 const int reuse_params = get_bits1(gb);
635 const int stereo = s->block_config->type[block_idx] == ATRAC9_BLOCK_TYPE_CPE;
637 if (first_in_pkt && reuse_params) {
638 av_log(s->avctx, AV_LOG_ERROR, "Invalid block flags!\n");
639 return AVERROR_INVALIDDATA;
642 /* Band parameters */
644 int stereo_band, ext_band;
645 const int min_band_count = s->samplerate_idx > 7 ? 1 : 3;
646 b->band_count = get_bits(gb, 4) + min_band_count;
647 b->q_unit_cnt = at9_tab_band_q_unit_map[b->band_count];
649 b->band_ext_q_unit = b->stereo_q_unit = b->q_unit_cnt;
651 if (b->band_count > at9_tab_sri_max_bands[s->samplerate_idx]) {
652 av_log(s->avctx, AV_LOG_ERROR, "Invalid band count %i!\n",
654 return AVERROR_INVALIDDATA;
658 stereo_band = get_bits(gb, 4) + min_band_count;
659 if (stereo_band > b->band_count) {
660 av_log(s->avctx, AV_LOG_ERROR, "Invalid stereo band %i!\n",
662 return AVERROR_INVALIDDATA;
664 b->stereo_q_unit = at9_tab_band_q_unit_map[stereo_band];
667 b->has_band_ext = get_bits1(gb);
668 if (b->has_band_ext) {
669 ext_band = get_bits(gb, 4) + min_band_count;
670 if (ext_band < b->band_count) {
671 av_log(s->avctx, AV_LOG_ERROR, "Invalid extension band %i!\n",
673 return AVERROR_INVALIDDATA;
675 b->band_ext_q_unit = at9_tab_band_q_unit_map[ext_band];
679 /* Calculate bit alloc gradient */
680 if (parse_gradient(s, b, gb))
681 return AVERROR_INVALIDDATA;
684 b->cpe_base_channel = 0;
686 b->cpe_base_channel = get_bits1(gb);
688 for (int i = b->stereo_q_unit; i < b->q_unit_cnt; i++)
689 b->is_signs[i] = 1 - 2*get_bits1(gb);
691 for (int i = 0; i < FF_ARRAY_ELEMS(b->is_signs); i++)
697 if (parse_band_ext(s, b, gb, stereo))
698 return AVERROR_INVALIDDATA;
701 for (int i = 0; i <= stereo; i++) {
702 ATRAC9ChannelData *c = &b->channel[i];
703 c->q_unit_cnt = i == b->cpe_base_channel ? b->q_unit_cnt :
705 if (read_scalefactors(s, b, c, gb, i, first_in_pkt))
706 return AVERROR_INVALIDDATA;
708 calc_precision (s, b, c);
709 calc_codebook_idx (s, b, c);
710 read_coeffs_coarse(s, b, c, gb);
711 read_coeffs_fine (s, b, c, gb);
712 dequantize (s, b, c);
715 b->q_unit_cnt_prev = b->has_band_ext ? b->band_ext_q_unit : b->q_unit_cnt;
717 apply_intensity_stereo(s, b, stereo);
718 apply_scalefactors (s, b, stereo);
719 apply_band_extension (s, b, stereo);
722 for (int i = 0; i <= stereo; i++) {
723 ATRAC9ChannelData *c = &b->channel[i];
724 const int dst_idx = s->block_config->plane_map[block_idx][i];
725 const int wsize = 1 << s->frame_log2;
726 const ptrdiff_t offset = wsize*frame_idx*sizeof(float);
727 float *dst = (float *)(frame->extended_data[dst_idx] + offset);
729 s->imdct.imdct_half(&s->imdct, s->temp, c->coeffs);
730 s->fdsp->vector_fmul_window(dst, c->prev_win, s->temp,
731 s->imdct_win, wsize >> 1);
732 memcpy(c->prev_win, s->temp + (wsize >> 1), sizeof(float)*wsize >> 1);
738 static int atrac9_decode_frame(AVCodecContext *avctx, void *data,
739 int *got_frame_ptr, AVPacket *avpkt)
743 AVFrame *frame = data;
744 ATRAC9Context *s = avctx->priv_data;
745 const int frames = FFMIN(avpkt->size / s->avg_frame_size, s->frame_count);
747 frame->nb_samples = (1 << s->frame_log2) * frames;
748 ret = ff_get_buffer(avctx, frame, 0);
752 init_get_bits8(&gb, avpkt->data, avpkt->size);
754 for (int i = 0; i < frames; i++) {
755 for (int j = 0; j < s->block_config->count; j++) {
756 ret = atrac9_decode_block(s, &gb, &s->block[j], frame, i, j);
765 return avctx->block_align;
768 static void atrac9_decode_flush(AVCodecContext *avctx)
770 ATRAC9Context *s = avctx->priv_data;
772 for (int j = 0; j < s->block_config->count; j++) {
773 ATRAC9BlockData *b = &s->block[j];
774 const int stereo = s->block_config->type[j] == ATRAC9_BLOCK_TYPE_CPE;
775 for (int i = 0; i <= stereo; i++) {
776 ATRAC9ChannelData *c = &b->channel[i];
777 memset(c->prev_win, 0, sizeof(c->prev_win));
782 static av_cold int atrac9_decode_close(AVCodecContext *avctx)
784 ATRAC9Context *s = avctx->priv_data;
786 for (int i = 1; i < 7; i++)
787 ff_free_vlc(&s->sf_vlc[0][i]);
788 for (int i = 2; i < 6; i++)
789 ff_free_vlc(&s->sf_vlc[1][i]);
790 for (int i = 0; i < 2; i++)
791 for (int j = 0; j < 8; j++)
792 for (int k = 0; k < 4; k++)
793 ff_free_vlc(&s->coeff_vlc[i][j][k]);
795 ff_mdct_end(&s->imdct);
801 static av_cold int atrac9_decode_init(AVCodecContext *avctx)
804 ATRAC9Context *s = avctx->priv_data;
805 int version, block_config_idx, superframe_idx, alloc_c_len;
809 av_lfg_init(&s->lfg, 0xFBADF00D);
811 if (avctx->extradata_size != 12) {
812 av_log(avctx, AV_LOG_ERROR, "Invalid extradata length!\n");
813 return AVERROR_INVALIDDATA;
816 version = AV_RL32(avctx->extradata);
818 av_log(avctx, AV_LOG_ERROR, "Unsupported version (%i)!\n", version);
819 return AVERROR_INVALIDDATA;
822 init_get_bits8(&gb, avctx->extradata + 4, avctx->extradata_size);
824 if (get_bits(&gb, 8) != 0xFE) {
825 av_log(avctx, AV_LOG_ERROR, "Incorrect magic byte!\n");
826 return AVERROR_INVALIDDATA;
829 s->samplerate_idx = get_bits(&gb, 4);
830 avctx->sample_rate = at9_tab_samplerates[s->samplerate_idx];
832 block_config_idx = get_bits(&gb, 3);
833 if (block_config_idx > 5) {
834 av_log(avctx, AV_LOG_ERROR, "Incorrect block config!\n");
835 return AVERROR_INVALIDDATA;
837 s->block_config = &at9_block_layout[block_config_idx];
839 avctx->channel_layout = s->block_config->channel_layout;
840 avctx->sample_fmt = AV_SAMPLE_FMT_FLTP;
842 if (get_bits1(&gb)) {
843 av_log(avctx, AV_LOG_ERROR, "Incorrect verification bit!\n");
844 return AVERROR_INVALIDDATA;
847 /* Average frame size in bytes */
848 s->avg_frame_size = get_bits(&gb, 11) + 1;
850 superframe_idx = get_bits(&gb, 2);
851 if (superframe_idx & 1) {
852 av_log(avctx, AV_LOG_ERROR, "Invalid superframe index!\n");
853 return AVERROR_INVALIDDATA;
856 s->frame_count = 1 << superframe_idx;
857 s->frame_log2 = at9_tab_sri_frame_log2[s->samplerate_idx];
859 if (ff_mdct_init(&s->imdct, s->frame_log2 + 1, 1, 1.0f / 32768.0f))
860 return AVERROR(ENOMEM);
862 s->fdsp = avpriv_float_dsp_alloc(avctx->flags & AV_CODEC_FLAG_BITEXACT);
864 return AVERROR(ENOMEM);
867 for (int i = 0; i < (1 << s->frame_log2); i++) {
868 const int len = 1 << s->frame_log2;
869 const float sidx = ( i + 0.5f) / len;
870 const float eidx = (len - i - 0.5f) / len;
871 const float s_c = sinf(sidx*M_PI - M_PI_2)*0.5f + 0.5f;
872 const float e_c = sinf(eidx*M_PI - M_PI_2)*0.5f + 0.5f;
873 s->imdct_win[i] = s_c / ((s_c * s_c) + (e_c * e_c));
876 /* Allocation curve */
877 alloc_c_len = FF_ARRAY_ELEMS(at9_tab_b_dist);
878 for (int i = 1; i <= alloc_c_len; i++)
879 for (int j = 0; j < i; j++)
880 s->alloc_curve[i - 1][j] = at9_tab_b_dist[(j * alloc_c_len) / i];
882 /* Unsigned scalefactor VLCs */
883 for (int i = 1; i < 7; i++) {
884 const HuffmanCodebook *hf = &at9_huffman_sf_unsigned[i];
886 init_vlc(&s->sf_vlc[0][i], 9, hf->size, hf->bits, 1, 1, hf->codes,
890 /* Signed scalefactor VLCs */
891 for (int i = 2; i < 6; i++) {
892 const HuffmanCodebook *hf = &at9_huffman_sf_signed[i];
896 for (int j = 0; j < nums; j++)
897 sym[j] = sign_extend(j, hf->value_bits);
899 ff_init_vlc_sparse(&s->sf_vlc[1][i], 9, hf->size, hf->bits, 1, 1,
900 hf->codes, 2, 2, sym, sizeof(*sym), sizeof(*sym), 0);
903 /* Coefficient VLCs */
904 for (int i = 0; i < 2; i++) {
905 for (int j = 0; j < 8; j++) {
906 for (int k = 0; k < 4; k++) {
907 const HuffmanCodebook *hf = &at9_huffman_coeffs[i][j][k];
908 init_vlc(&s->coeff_vlc[i][j][k], 9, hf->size, hf->bits, 1, 1,
917 AVCodec ff_atrac9_decoder = {
919 .long_name = NULL_IF_CONFIG_SMALL("ATRAC9 (Adaptive TRansform Acoustic Coding 9)"),
920 .type = AVMEDIA_TYPE_AUDIO,
921 .id = AV_CODEC_ID_ATRAC9,
922 .priv_data_size = sizeof(ATRAC9Context),
923 .init = atrac9_decode_init,
924 .close = atrac9_decode_close,
925 .decode = atrac9_decode_frame,
926 .flush = atrac9_decode_flush,
927 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE | FF_CODEC_CAP_INIT_CLEANUP,
928 .capabilities = AV_CODEC_CAP_SUBFRAMES | AV_CODEC_CAP_DR1,