3 * Copyright (c) 2009 Vitor Sessak
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 "libavutil/channel_layout.h"
26 #include "libavutil/float_dsp.h"
35 * Evaluate a single LPC amplitude spectrum envelope coefficient from the line
38 * @param lsp a vector of the cosine of the LSP values
39 * @param cos_val cos(PI*i/N) where i is the index of the LPC amplitude
40 * @param order the order of the LSP (and the size of the *lsp buffer). Must
41 * be a multiple of four.
42 * @return the LPC value
44 * @todo reuse code from Vorbis decoder: vorbis_floor0_decode
46 static float eval_lpc_spectrum(const float *lsp, float cos_val, int order)
51 float two_cos_w = 2.0f * cos_val;
53 for (j = 0; j + 1 < order; j += 2 * 2) {
54 // Unroll the loop once since order is a multiple of four
55 q *= lsp[j] - two_cos_w;
56 p *= lsp[j + 1] - two_cos_w;
58 q *= lsp[j + 2] - two_cos_w;
59 p *= lsp[j + 3] - two_cos_w;
62 p *= p * (2.0f - two_cos_w);
63 q *= q * (2.0f + two_cos_w);
69 * Evaluate the LPC amplitude spectrum envelope from the line spectrum pairs.
71 static void eval_lpcenv(TwinVQContext *tctx, const float *cos_vals, float *lpc)
74 const TwinVQModeTab *mtab = tctx->mtab;
75 int size_s = mtab->size / mtab->fmode[TWINVQ_FT_SHORT].sub;
77 for (i = 0; i < size_s / 2; i++) {
78 float cos_i = tctx->cos_tabs[0][i];
79 lpc[i] = eval_lpc_spectrum(cos_vals, cos_i, mtab->n_lsp);
80 lpc[size_s - i - 1] = eval_lpc_spectrum(cos_vals, -cos_i, mtab->n_lsp);
84 static void interpolate(float *out, float v1, float v2, int size)
87 float step = (v1 - v2) / (size + 1);
89 for (i = 0; i < size; i++) {
95 static inline float get_cos(int idx, int part, const float *cos_tab, int size)
97 return part ? -cos_tab[size - idx - 1]
102 * Evaluate the LPC amplitude spectrum envelope from the line spectrum pairs.
103 * Probably for speed reasons, the coefficients are evaluated as
104 * siiiibiiiisiiiibiiiisiiiibiiiisiiiibiiiis ...
105 * where s is an evaluated value, i is a value interpolated from the others
106 * and b might be either calculated or interpolated, depending on an
107 * unexplained condition.
109 * @param step the size of a block "siiiibiiii"
110 * @param in the cosine of the LSP data
111 * @param part is 0 for 0...PI (positive cosine values) and 1 for PI...2PI
112 * (negative cosine values)
113 * @param size the size of the whole output
115 static inline void eval_lpcenv_or_interp(TwinVQContext *tctx,
116 enum TwinVQFrameType ftype,
117 float *out, const float *in,
118 int size, int step, int part)
121 const TwinVQModeTab *mtab = tctx->mtab;
122 const float *cos_tab = tctx->cos_tabs[ftype];
125 for (i = 0; i < size; i += step)
127 eval_lpc_spectrum(in,
128 get_cos(i, part, cos_tab, size),
131 // Fill the 'iiiibiiii'
132 for (i = step; i <= size - 2 * step; i += step) {
133 if (out[i + step] + out[i - step] > 1.95 * out[i] ||
134 out[i + step] >= out[i - step]) {
135 interpolate(out + i - step + 1, out[i], out[i - step], step - 1);
138 eval_lpc_spectrum(in,
139 get_cos(i - step / 2, part, cos_tab, size),
141 interpolate(out + i - step + 1, out[i - step / 2],
142 out[i - step], step / 2 - 1);
143 interpolate(out + i - step / 2 + 1, out[i],
144 out[i - step / 2], step / 2 - 1);
148 interpolate(out + size - 2 * step + 1, out[size - step],
149 out[size - 2 * step], step - 1);
152 static void eval_lpcenv_2parts(TwinVQContext *tctx, enum TwinVQFrameType ftype,
153 const float *buf, float *lpc,
156 eval_lpcenv_or_interp(tctx, ftype, lpc, buf, size / 2, step, 0);
157 eval_lpcenv_or_interp(tctx, ftype, lpc + size / 2, buf, size / 2,
160 interpolate(lpc + size / 2 - step + 1, lpc[size / 2],
161 lpc[size / 2 - step], step);
163 twinvq_memset_float(lpc + size - 2 * step + 1, lpc[size - 2 * step],
168 * Inverse quantization. Read CB coefficients for cb1 and cb2 from the
169 * bitstream, sum the corresponding vectors and write the result to *out
172 static void dequant(TwinVQContext *tctx, const uint8_t *cb_bits, float *out,
173 enum TwinVQFrameType ftype,
174 const int16_t *cb0, const int16_t *cb1, int cb_len)
179 for (i = 0; i < tctx->n_div[ftype]; i++) {
183 const int16_t *tab0, *tab1;
184 int length = tctx->length[ftype][i >= tctx->length_change[ftype]];
185 int bitstream_second_part = (i >= tctx->bits_main_spec_change[ftype]);
187 int bits = tctx->bits_main_spec[0][ftype][bitstream_second_part];
195 bits = tctx->bits_main_spec[1][ftype][bitstream_second_part];
203 tab0 = cb0 + tmp0 * cb_len;
204 tab1 = cb1 + tmp1 * cb_len;
206 for (j = 0; j < length; j++)
207 out[tctx->permut[ftype][pos + j]] = sign0 * tab0[j] +
214 static void dec_gain(TwinVQContext *tctx,
215 enum TwinVQFrameType ftype, float *out)
217 const TwinVQModeTab *mtab = tctx->mtab;
218 const TwinVQFrameData *bits = &tctx->bits[tctx->cur_frame];
220 int sub = mtab->fmode[ftype].sub;
221 float step = TWINVQ_AMP_MAX / ((1 << TWINVQ_GAIN_BITS) - 1);
222 float sub_step = TWINVQ_SUB_AMP_MAX / ((1 << TWINVQ_SUB_GAIN_BITS) - 1);
224 if (ftype == TWINVQ_FT_LONG) {
225 for (i = 0; i < tctx->avctx->channels; i++)
226 out[i] = (1.0 / (1 << 13)) *
227 twinvq_mulawinv(step * 0.5 + step * bits->gain_bits[i],
228 TWINVQ_AMP_MAX, TWINVQ_MULAW_MU);
230 for (i = 0; i < tctx->avctx->channels; i++) {
231 float val = (1.0 / (1 << 23)) *
232 twinvq_mulawinv(step * 0.5 + step * bits->gain_bits[i],
233 TWINVQ_AMP_MAX, TWINVQ_MULAW_MU);
235 for (j = 0; j < sub; j++)
237 val * twinvq_mulawinv(sub_step * 0.5 +
238 sub_step * bits->sub_gain_bits[i * sub + j],
239 TWINVQ_SUB_AMP_MAX, TWINVQ_MULAW_MU);
245 * Rearrange the LSP coefficients so that they have a minimum distance of
246 * min_dist. This function does it exactly as described in section of 3.2.4
247 * of the G.729 specification (but interestingly is different from what the
248 * reference decoder actually does).
250 static void rearrange_lsp(int order, float *lsp, float min_dist)
253 float min_dist2 = min_dist * 0.5;
254 for (i = 1; i < order; i++)
255 if (lsp[i] - lsp[i - 1] < min_dist) {
256 float avg = (lsp[i] + lsp[i - 1]) * 0.5;
258 lsp[i - 1] = avg - min_dist2;
259 lsp[i] = avg + min_dist2;
263 static void decode_lsp(TwinVQContext *tctx, int lpc_idx1, uint8_t *lpc_idx2,
264 int lpc_hist_idx, float *lsp, float *hist)
266 const TwinVQModeTab *mtab = tctx->mtab;
269 const float *cb = mtab->lspcodebook;
270 const float *cb2 = cb + (1 << mtab->lsp_bit1) * mtab->n_lsp;
271 const float *cb3 = cb2 + (1 << mtab->lsp_bit2) * mtab->n_lsp;
273 const int8_t funny_rounding[4] = {
275 mtab->lsp_split == 4 ? -2 : 1,
276 mtab->lsp_split == 4 ? -2 : 1,
281 for (i = 0; i < mtab->lsp_split; i++) {
282 int chunk_end = ((i + 1) * mtab->n_lsp + funny_rounding[i]) /
284 for (; j < chunk_end; j++)
285 lsp[j] = cb[lpc_idx1 * mtab->n_lsp + j] +
286 cb2[lpc_idx2[i] * mtab->n_lsp + j];
289 rearrange_lsp(mtab->n_lsp, lsp, 0.0001);
291 for (i = 0; i < mtab->n_lsp; i++) {
292 float tmp1 = 1.0 - cb3[lpc_hist_idx * mtab->n_lsp + i];
293 float tmp2 = hist[i] * cb3[lpc_hist_idx * mtab->n_lsp + i];
295 lsp[i] = lsp[i] * tmp1 + tmp2;
298 rearrange_lsp(mtab->n_lsp, lsp, 0.0001);
299 rearrange_lsp(mtab->n_lsp, lsp, 0.000095);
300 ff_sort_nearly_sorted_floats(lsp, mtab->n_lsp);
303 static void dec_lpc_spectrum_inv(TwinVQContext *tctx, float *lsp,
304 enum TwinVQFrameType ftype, float *lpc)
307 int size = tctx->mtab->size / tctx->mtab->fmode[ftype].sub;
309 for (i = 0; i < tctx->mtab->n_lsp; i++)
310 lsp[i] = 2 * cos(lsp[i]);
314 eval_lpcenv_2parts(tctx, ftype, lsp, lpc, size, 8);
316 case TWINVQ_FT_MEDIUM:
317 eval_lpcenv_2parts(tctx, ftype, lsp, lpc, size, 2);
319 case TWINVQ_FT_SHORT:
320 eval_lpcenv(tctx, lsp, lpc);
325 static const uint8_t wtype_to_wsize[] = { 0, 0, 2, 2, 2, 1, 0, 1, 1 };
327 static void imdct_and_window(TwinVQContext *tctx, enum TwinVQFrameType ftype,
328 int wtype, float *in, float *prev, int ch)
330 FFTContext *mdct = &tctx->mdct_ctx[ftype];
331 const TwinVQModeTab *mtab = tctx->mtab;
332 int bsize = mtab->size / mtab->fmode[ftype].sub;
333 int size = mtab->size;
334 float *buf1 = tctx->tmp_buf;
335 int j, first_wsize, wsize; // Window size
336 float *out = tctx->curr_frame + 2 * ch * mtab->size;
339 int types_sizes[] = {
340 mtab->size / mtab->fmode[TWINVQ_FT_LONG].sub,
341 mtab->size / mtab->fmode[TWINVQ_FT_MEDIUM].sub,
342 mtab->size / (mtab->fmode[TWINVQ_FT_SHORT].sub * 2),
345 wsize = types_sizes[wtype_to_wsize[wtype]];
347 prev_buf = prev + (size - bsize) / 2;
349 for (j = 0; j < mtab->fmode[ftype].sub; j++) {
350 int sub_wtype = ftype == TWINVQ_FT_MEDIUM ? 8 : wtype;
352 if (!j && wtype == 4)
354 else if (j == mtab->fmode[ftype].sub - 1 && wtype == 7)
357 wsize = types_sizes[wtype_to_wsize[sub_wtype]];
359 mdct->imdct_half(mdct, buf1 + bsize * j, in + bsize * j);
361 tctx->fdsp->vector_fmul_window(out2, prev_buf + (bsize - wsize) / 2,
363 ff_sine_windows[av_log2(wsize)],
367 memcpy(out2, buf1 + bsize * j + wsize / 2,
368 (bsize - wsize / 2) * sizeof(float));
370 out2 += ftype == TWINVQ_FT_MEDIUM ? (bsize - wsize) / 2 : bsize - wsize;
372 prev_buf = buf1 + bsize * j + bsize / 2;
375 tctx->last_block_pos[ch] = (size + first_wsize) / 2;
378 static void imdct_output(TwinVQContext *tctx, enum TwinVQFrameType ftype,
379 int wtype, float **out, int offset)
381 const TwinVQModeTab *mtab = tctx->mtab;
382 float *prev_buf = tctx->prev_frame + tctx->last_block_pos[0];
386 for (i = 0; i < tctx->avctx->channels; i++)
387 imdct_and_window(tctx, ftype, wtype,
388 tctx->spectrum + i * mtab->size,
389 prev_buf + 2 * i * mtab->size,
395 size2 = tctx->last_block_pos[0];
396 size1 = mtab->size - size2;
398 out1 = &out[0][0] + offset;
399 memcpy(out1, prev_buf, size1 * sizeof(*out1));
400 memcpy(out1 + size1, tctx->curr_frame, size2 * sizeof(*out1));
402 if (tctx->avctx->channels == 2) {
403 out2 = &out[1][0] + offset;
404 memcpy(out2, &prev_buf[2 * mtab->size],
405 size1 * sizeof(*out2));
406 memcpy(out2 + size1, &tctx->curr_frame[2 * mtab->size],
407 size2 * sizeof(*out2));
408 tctx->fdsp->butterflies_float(out1, out2, mtab->size);
412 static void read_and_decode_spectrum(TwinVQContext *tctx, float *out,
413 enum TwinVQFrameType ftype)
415 const TwinVQModeTab *mtab = tctx->mtab;
416 TwinVQFrameData *bits = &tctx->bits[tctx->cur_frame];
417 int channels = tctx->avctx->channels;
418 int sub = mtab->fmode[ftype].sub;
419 int block_size = mtab->size / sub;
420 float gain[TWINVQ_CHANNELS_MAX * TWINVQ_SUBBLOCKS_MAX];
421 float ppc_shape[TWINVQ_PPC_SHAPE_LEN_MAX * TWINVQ_CHANNELS_MAX * 4];
425 dequant(tctx, bits->main_coeffs, out, ftype,
426 mtab->fmode[ftype].cb0, mtab->fmode[ftype].cb1,
427 mtab->fmode[ftype].cb_len_read);
429 dec_gain(tctx, ftype, gain);
431 if (ftype == TWINVQ_FT_LONG) {
432 int cb_len_p = (tctx->n_div[3] + mtab->ppc_shape_len * channels - 1) /
434 dequant(tctx, bits->ppc_coeffs, ppc_shape,
435 TWINVQ_FT_PPC, mtab->ppc_shape_cb,
436 mtab->ppc_shape_cb + cb_len_p * TWINVQ_PPC_SHAPE_CB_SIZE,
440 for (i = 0; i < channels; i++) {
441 float *chunk = out + mtab->size * i;
442 float lsp[TWINVQ_LSP_COEFS_MAX];
444 for (j = 0; j < sub; j++) {
445 tctx->dec_bark_env(tctx, bits->bark1[i][j],
446 bits->bark_use_hist[i][j], i,
447 tctx->tmp_buf, gain[sub * i + j], ftype);
449 tctx->fdsp->vector_fmul(chunk + block_size * j,
450 chunk + block_size * j,
451 tctx->tmp_buf, block_size);
454 if (ftype == TWINVQ_FT_LONG)
455 tctx->decode_ppc(tctx, bits->p_coef[i], bits->g_coef[i],
456 ppc_shape + i * mtab->ppc_shape_len, chunk);
458 decode_lsp(tctx, bits->lpc_idx1[i], bits->lpc_idx2[i],
459 bits->lpc_hist_idx[i], lsp, tctx->lsp_hist[i]);
461 dec_lpc_spectrum_inv(tctx, lsp, ftype, tctx->tmp_buf);
463 for (j = 0; j < mtab->fmode[ftype].sub; j++) {
464 tctx->fdsp->vector_fmul(chunk, chunk, tctx->tmp_buf, block_size);
470 const enum TwinVQFrameType ff_twinvq_wtype_to_ftype_table[] = {
471 TWINVQ_FT_LONG, TWINVQ_FT_LONG, TWINVQ_FT_SHORT, TWINVQ_FT_LONG,
472 TWINVQ_FT_MEDIUM, TWINVQ_FT_LONG, TWINVQ_FT_LONG, TWINVQ_FT_MEDIUM,
476 int ff_twinvq_decode_frame(AVCodecContext *avctx, void *data,
477 int *got_frame_ptr, AVPacket *avpkt)
479 AVFrame *frame = data;
480 const uint8_t *buf = avpkt->data;
481 int buf_size = avpkt->size;
482 TwinVQContext *tctx = avctx->priv_data;
483 const TwinVQModeTab *mtab = tctx->mtab;
487 /* get output buffer */
488 if (tctx->discarded_packets >= 2) {
489 frame->nb_samples = mtab->size * tctx->frames_per_packet;
490 if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
492 out = (float **)frame->extended_data;
495 if (buf_size < avctx->block_align) {
496 av_log(avctx, AV_LOG_ERROR,
497 "Frame too small (%d bytes). Truncated file?\n", buf_size);
498 return AVERROR(EINVAL);
501 if ((ret = tctx->read_bitstream(avctx, tctx, buf, buf_size)) < 0)
504 for (tctx->cur_frame = 0; tctx->cur_frame < tctx->frames_per_packet;
506 read_and_decode_spectrum(tctx, tctx->spectrum,
507 tctx->bits[tctx->cur_frame].ftype);
509 imdct_output(tctx, tctx->bits[tctx->cur_frame].ftype,
510 tctx->bits[tctx->cur_frame].window_type, out,
511 tctx->cur_frame * mtab->size);
513 FFSWAP(float *, tctx->curr_frame, tctx->prev_frame);
516 if (tctx->discarded_packets < 2) {
517 tctx->discarded_packets++;
524 // VQF can deliver packets 1 byte greater than block align
525 if (buf_size == avctx->block_align + 1)
527 return avctx->block_align;
531 * Init IMDCT and windowing tables
533 static av_cold int init_mdct_win(TwinVQContext *tctx)
536 const TwinVQModeTab *mtab = tctx->mtab;
537 int size_s = mtab->size / mtab->fmode[TWINVQ_FT_SHORT].sub;
538 int size_m = mtab->size / mtab->fmode[TWINVQ_FT_MEDIUM].sub;
539 int channels = tctx->avctx->channels;
540 float norm = channels == 1 ? 2.0 : 1.0;
542 for (i = 0; i < 3; i++) {
543 int bsize = tctx->mtab->size / tctx->mtab->fmode[i].sub;
544 if ((ret = ff_mdct_init(&tctx->mdct_ctx[i], av_log2(bsize) + 1, 1,
545 -sqrt(norm / bsize) / (1 << 15))))
549 FF_ALLOC_ARRAY_OR_GOTO(tctx->avctx, tctx->tmp_buf,
550 mtab->size, sizeof(*tctx->tmp_buf), alloc_fail);
552 FF_ALLOC_ARRAY_OR_GOTO(tctx->avctx, tctx->spectrum,
553 2 * mtab->size, channels * sizeof(*tctx->spectrum),
555 FF_ALLOC_ARRAY_OR_GOTO(tctx->avctx, tctx->curr_frame,
556 2 * mtab->size, channels * sizeof(*tctx->curr_frame),
558 FF_ALLOC_ARRAY_OR_GOTO(tctx->avctx, tctx->prev_frame,
559 2 * mtab->size, channels * sizeof(*tctx->prev_frame),
562 for (i = 0; i < 3; i++) {
563 int m = 4 * mtab->size / mtab->fmode[i].sub;
564 double freq = 2 * M_PI / m;
565 FF_ALLOC_ARRAY_OR_GOTO(tctx->avctx, tctx->cos_tabs[i],
566 (m / 4), sizeof(*tctx->cos_tabs[i]), alloc_fail);
568 for (j = 0; j <= m / 8; j++)
569 tctx->cos_tabs[i][j] = cos((2 * j + 1) * freq);
570 for (j = 1; j < m / 8; j++)
571 tctx->cos_tabs[i][m / 4 - j] = tctx->cos_tabs[i][j];
574 ff_init_ff_sine_windows(av_log2(size_m));
575 ff_init_ff_sine_windows(av_log2(size_s / 2));
576 ff_init_ff_sine_windows(av_log2(mtab->size));
581 return AVERROR(ENOMEM);
585 * Interpret the data as if it were a num_blocks x line_len[0] matrix and for
586 * each line do a cyclic permutation, i.e.
587 * abcdefghijklm -> defghijklmabc
588 * where the amount to be shifted is evaluated depending on the column.
590 static void permutate_in_line(int16_t *tab, int num_vect, int num_blocks,
592 const uint8_t line_len[2], int length_div,
593 enum TwinVQFrameType ftype)
597 for (i = 0; i < line_len[0]; i++) {
600 if (num_blocks == 1 ||
601 (ftype == TWINVQ_FT_LONG && num_vect % num_blocks) ||
602 (ftype != TWINVQ_FT_LONG && num_vect & 1) ||
605 } else if (ftype == TWINVQ_FT_LONG) {
610 for (j = 0; j < num_vect && (j + num_vect * i < block_size * num_blocks); j++)
611 tab[i * num_vect + j] = i * num_vect + (j + shift) % num_vect;
616 * Interpret the input data as in the following table:
627 * and transpose it, giving the output
628 * aiqxbjr1cks2dlt3emu4fvn5gow6hp
630 static void transpose_perm(int16_t *out, int16_t *in, int num_vect,
631 const uint8_t line_len[2], int length_div)
636 for (i = 0; i < num_vect; i++)
637 for (j = 0; j < line_len[i >= length_div]; j++)
638 out[cont++] = in[j * num_vect + i];
641 static void linear_perm(int16_t *out, int16_t *in, int n_blocks, int size)
643 int block_size = size / n_blocks;
646 for (i = 0; i < size; i++)
647 out[i] = block_size * (in[i] % n_blocks) + in[i] / n_blocks;
650 static av_cold void construct_perm_table(TwinVQContext *tctx,
651 enum TwinVQFrameType ftype)
653 int block_size, size;
654 const TwinVQModeTab *mtab = tctx->mtab;
655 int16_t *tmp_perm = (int16_t *)tctx->tmp_buf;
657 if (ftype == TWINVQ_FT_PPC) {
658 size = tctx->avctx->channels;
659 block_size = mtab->ppc_shape_len;
661 size = tctx->avctx->channels * mtab->fmode[ftype].sub;
662 block_size = mtab->size / mtab->fmode[ftype].sub;
665 permutate_in_line(tmp_perm, tctx->n_div[ftype], size,
666 block_size, tctx->length[ftype],
667 tctx->length_change[ftype], ftype);
669 transpose_perm(tctx->permut[ftype], tmp_perm, tctx->n_div[ftype],
670 tctx->length[ftype], tctx->length_change[ftype]);
672 linear_perm(tctx->permut[ftype], tctx->permut[ftype], size,
676 static av_cold void init_bitstream_params(TwinVQContext *tctx)
678 const TwinVQModeTab *mtab = tctx->mtab;
679 int n_ch = tctx->avctx->channels;
680 int total_fr_bits = tctx->avctx->bit_rate * mtab->size /
681 tctx->avctx->sample_rate;
683 int lsp_bits_per_block = n_ch * (mtab->lsp_bit0 + mtab->lsp_bit1 +
684 mtab->lsp_split * mtab->lsp_bit2);
686 int ppc_bits = n_ch * (mtab->pgain_bit + mtab->ppc_shape_bit +
687 mtab->ppc_period_bit);
689 int bsize_no_main_cb[3], bse_bits[3], i;
690 enum TwinVQFrameType frametype;
692 for (i = 0; i < 3; i++)
693 // +1 for history usage switch
695 (mtab->fmode[i].bark_n_coef *
696 mtab->fmode[i].bark_n_bit + 1);
698 bsize_no_main_cb[2] = bse_bits[2] + lsp_bits_per_block + ppc_bits +
699 TWINVQ_WINDOW_TYPE_BITS + n_ch * TWINVQ_GAIN_BITS;
701 for (i = 0; i < 2; i++)
702 bsize_no_main_cb[i] =
703 lsp_bits_per_block + n_ch * TWINVQ_GAIN_BITS +
704 TWINVQ_WINDOW_TYPE_BITS +
705 mtab->fmode[i].sub * (bse_bits[i] + n_ch * TWINVQ_SUB_GAIN_BITS);
707 if (tctx->codec == TWINVQ_CODEC_METASOUND && !tctx->is_6kbps) {
708 bsize_no_main_cb[1] += 2;
709 bsize_no_main_cb[2] += 2;
712 // The remaining bits are all used for the main spectrum coefficients
713 for (i = 0; i < 4; i++) {
714 int bit_size, vect_size;
715 int rounded_up, rounded_down, num_rounded_down, num_rounded_up;
717 bit_size = n_ch * mtab->ppc_shape_bit;
718 vect_size = n_ch * mtab->ppc_shape_len;
720 bit_size = total_fr_bits - bsize_no_main_cb[i];
721 vect_size = n_ch * mtab->size;
724 tctx->n_div[i] = (bit_size + 13) / 14;
726 rounded_up = (bit_size + tctx->n_div[i] - 1) /
728 rounded_down = (bit_size) / tctx->n_div[i];
729 num_rounded_down = rounded_up * tctx->n_div[i] - bit_size;
730 num_rounded_up = tctx->n_div[i] - num_rounded_down;
731 tctx->bits_main_spec[0][i][0] = (rounded_up + 1) / 2;
732 tctx->bits_main_spec[1][i][0] = rounded_up / 2;
733 tctx->bits_main_spec[0][i][1] = (rounded_down + 1) / 2;
734 tctx->bits_main_spec[1][i][1] = rounded_down / 2;
735 tctx->bits_main_spec_change[i] = num_rounded_up;
737 rounded_up = (vect_size + tctx->n_div[i] - 1) /
739 rounded_down = (vect_size) / tctx->n_div[i];
740 num_rounded_down = rounded_up * tctx->n_div[i] - vect_size;
741 num_rounded_up = tctx->n_div[i] - num_rounded_down;
742 tctx->length[i][0] = rounded_up;
743 tctx->length[i][1] = rounded_down;
744 tctx->length_change[i] = num_rounded_up;
747 for (frametype = TWINVQ_FT_SHORT; frametype <= TWINVQ_FT_PPC; frametype++)
748 construct_perm_table(tctx, frametype);
751 av_cold int ff_twinvq_decode_close(AVCodecContext *avctx)
753 TwinVQContext *tctx = avctx->priv_data;
756 for (i = 0; i < 3; i++) {
757 ff_mdct_end(&tctx->mdct_ctx[i]);
758 av_freep(&tctx->cos_tabs[i]);
761 av_freep(&tctx->curr_frame);
762 av_freep(&tctx->spectrum);
763 av_freep(&tctx->prev_frame);
764 av_freep(&tctx->tmp_buf);
765 av_freep(&tctx->fdsp);
770 av_cold int ff_twinvq_decode_init(AVCodecContext *avctx)
773 TwinVQContext *tctx = avctx->priv_data;
776 avctx->sample_fmt = AV_SAMPLE_FMT_FLTP;
778 if (!avctx->block_align) {
779 avctx->block_align = tctx->frame_size + 7 >> 3;
780 } else if (avctx->block_align * 8 < tctx->frame_size) {
781 av_log(avctx, AV_LOG_ERROR, "Block align is %d bits, expected %d\n",
782 avctx->block_align * 8, tctx->frame_size);
783 return AVERROR_INVALIDDATA;
785 tctx->frames_per_packet = avctx->block_align * 8 / tctx->frame_size;
786 if (tctx->frames_per_packet > TWINVQ_MAX_FRAMES_PER_PACKET) {
787 av_log(avctx, AV_LOG_ERROR, "Too many frames per packet (%d)\n",
788 tctx->frames_per_packet);
789 return AVERROR_INVALIDDATA;
792 tctx->fdsp = avpriv_float_dsp_alloc(avctx->flags & CODEC_FLAG_BITEXACT);
794 ff_twinvq_decode_close(avctx);
795 return AVERROR(ENOMEM);
797 if ((ret = init_mdct_win(tctx))) {
798 av_log(avctx, AV_LOG_ERROR, "Error initializing MDCT\n");
799 ff_twinvq_decode_close(avctx);
802 init_bitstream_params(tctx);
804 twinvq_memset_float(tctx->bark_hist[0][0], 0.1,
805 FF_ARRAY_ELEMS(tctx->bark_hist));