aacps.c
Go to the documentation of this file.
1 /*
2  * MPEG-4 Parametric Stereo decoding functions
3  * Copyright (c) 2010 Alex Converse <alex.converse@gmail.com>
4  *
5  * This file is part of Libav.
6  *
7  * Libav 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.
11  *
12  * Libav 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.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with Libav; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 #include <stdint.h>
23 #include "libavutil/common.h"
24 #include "libavutil/mathematics.h"
25 #include "avcodec.h"
26 #include "get_bits.h"
27 #include "aacps.h"
28 #include "aacps_tablegen.h"
29 #include "aacpsdata.c"
30 #include "dsputil.h"
31 
32 #define PS_BASELINE 0
33 
36 #define numQMFSlots 32 //numTimeSlots * RATE
37 
38 static const int8_t num_env_tab[2][4] = {
39  { 0, 1, 2, 4, },
40  { 1, 2, 3, 4, },
41 };
42 
43 static const int8_t nr_iidicc_par_tab[] = {
44  10, 20, 34, 10, 20, 34,
45 };
46 
47 static const int8_t nr_iidopd_par_tab[] = {
48  5, 11, 17, 5, 11, 17,
49 };
50 
51 enum {
62 };
63 
64 static const int huff_iid[] = {
69 };
70 
71 static VLC vlc_ps[10];
72 
73 #define READ_PAR_DATA(PAR, OFFSET, MASK, ERR_CONDITION) \
74  \
86 static int read_ ## PAR ## _data(AVCodecContext *avctx, GetBitContext *gb, PSContext *ps, \
87  int8_t (*PAR)[PS_MAX_NR_IIDICC], int table_idx, int e, int dt) \
88 { \
89  int b, num = ps->nr_ ## PAR ## _par; \
90  VLC_TYPE (*vlc_table)[2] = vlc_ps[table_idx].table; \
91  if (dt) { \
92  int e_prev = e ? e - 1 : ps->num_env_old - 1; \
93  e_prev = FFMAX(e_prev, 0); \
94  for (b = 0; b < num; b++) { \
95  int val = PAR[e_prev][b] + get_vlc2(gb, vlc_table, 9, 3) - OFFSET; \
96  if (MASK) val &= MASK; \
97  PAR[e][b] = val; \
98  if (ERR_CONDITION) \
99  goto err; \
100  } \
101  } else { \
102  int val = 0; \
103  for (b = 0; b < num; b++) { \
104  val += get_vlc2(gb, vlc_table, 9, 3) - OFFSET; \
105  if (MASK) val &= MASK; \
106  PAR[e][b] = val; \
107  if (ERR_CONDITION) \
108  goto err; \
109  } \
110  } \
111  return 0; \
112 err: \
113  av_log(avctx, AV_LOG_ERROR, "illegal "#PAR"\n"); \
114  return -1; \
115 }
116 
117 READ_PAR_DATA(iid, huff_offset[table_idx], 0, FFABS(ps->iid_par[e][b]) > 7 + 8 * ps->iid_quant)
118 READ_PAR_DATA(icc, huff_offset[table_idx], 0, ps->icc_par[e][b] > 7U)
119 READ_PAR_DATA(ipdopd, 0, 0x07, 0)
120 
121 static int ps_read_extension_data(GetBitContext *gb, PSContext *ps, int ps_extension_id)
122 {
123  int e;
124  int count = get_bits_count(gb);
125 
126  if (ps_extension_id)
127  return 0;
128 
129  ps->enable_ipdopd = get_bits1(gb);
130  if (ps->enable_ipdopd) {
131  for (e = 0; e < ps->num_env; e++) {
132  int dt = get_bits1(gb);
133  read_ipdopd_data(NULL, gb, ps, ps->ipd_par, dt ? huff_ipd_dt : huff_ipd_df, e, dt);
134  dt = get_bits1(gb);
135  read_ipdopd_data(NULL, gb, ps, ps->opd_par, dt ? huff_opd_dt : huff_opd_df, e, dt);
136  }
137  }
138  skip_bits1(gb); //reserved_ps
139  return get_bits_count(gb) - count;
140 }
141 
142 static void ipdopd_reset(int8_t *opd_hist, int8_t *ipd_hist)
143 {
144  int i;
145  for (i = 0; i < PS_MAX_NR_IPDOPD; i++) {
146  opd_hist[i] = 0;
147  ipd_hist[i] = 0;
148  }
149 }
150 
151 int ff_ps_read_data(AVCodecContext *avctx, GetBitContext *gb_host, PSContext *ps, int bits_left)
152 {
153  int e;
154  int bit_count_start = get_bits_count(gb_host);
155  int header;
156  int bits_consumed;
157  GetBitContext gbc = *gb_host, *gb = &gbc;
158 
159  header = get_bits1(gb);
160  if (header) { //enable_ps_header
161  ps->enable_iid = get_bits1(gb);
162  if (ps->enable_iid) {
163  int iid_mode = get_bits(gb, 3);
164  if (iid_mode > 5) {
165  av_log(avctx, AV_LOG_ERROR, "iid_mode %d is reserved.\n",
166  iid_mode);
167  goto err;
168  }
169  ps->nr_iid_par = nr_iidicc_par_tab[iid_mode];
170  ps->iid_quant = iid_mode > 2;
171  ps->nr_ipdopd_par = nr_iidopd_par_tab[iid_mode];
172  }
173  ps->enable_icc = get_bits1(gb);
174  if (ps->enable_icc) {
175  ps->icc_mode = get_bits(gb, 3);
176  if (ps->icc_mode > 5) {
177  av_log(avctx, AV_LOG_ERROR, "icc_mode %d is reserved.\n",
178  ps->icc_mode);
179  goto err;
180  }
182  }
183  ps->enable_ext = get_bits1(gb);
184  }
185 
186  ps->frame_class = get_bits1(gb);
187  ps->num_env_old = ps->num_env;
188  ps->num_env = num_env_tab[ps->frame_class][get_bits(gb, 2)];
189 
190  ps->border_position[0] = -1;
191  if (ps->frame_class) {
192  for (e = 1; e <= ps->num_env; e++)
193  ps->border_position[e] = get_bits(gb, 5);
194  } else
195  for (e = 1; e <= ps->num_env; e++)
196  ps->border_position[e] = (e * numQMFSlots >> ff_log2_tab[ps->num_env]) - 1;
197 
198  if (ps->enable_iid) {
199  for (e = 0; e < ps->num_env; e++) {
200  int dt = get_bits1(gb);
201  if (read_iid_data(avctx, gb, ps, ps->iid_par, huff_iid[2*dt+ps->iid_quant], e, dt))
202  goto err;
203  }
204  } else
205  memset(ps->iid_par, 0, sizeof(ps->iid_par));
206 
207  if (ps->enable_icc)
208  for (e = 0; e < ps->num_env; e++) {
209  int dt = get_bits1(gb);
210  if (read_icc_data(avctx, gb, ps, ps->icc_par, dt ? huff_icc_dt : huff_icc_df, e, dt))
211  goto err;
212  }
213  else
214  memset(ps->icc_par, 0, sizeof(ps->icc_par));
215 
216  if (ps->enable_ext) {
217  int cnt = get_bits(gb, 4);
218  if (cnt == 15) {
219  cnt += get_bits(gb, 8);
220  }
221  cnt *= 8;
222  while (cnt > 7) {
223  int ps_extension_id = get_bits(gb, 2);
224  cnt -= 2 + ps_read_extension_data(gb, ps, ps_extension_id);
225  }
226  if (cnt < 0) {
227  av_log(avctx, AV_LOG_ERROR, "ps extension overflow %d\n", cnt);
228  goto err;
229  }
230  skip_bits(gb, cnt);
231  }
232 
233  ps->enable_ipdopd &= !PS_BASELINE;
234 
235  //Fix up envelopes
236  if (!ps->num_env || ps->border_position[ps->num_env] < numQMFSlots - 1) {
237  //Create a fake envelope
238  int source = ps->num_env ? ps->num_env - 1 : ps->num_env_old - 1;
239  if (source >= 0 && source != ps->num_env) {
240  if (ps->enable_iid) {
241  memcpy(ps->iid_par+ps->num_env, ps->iid_par+source, sizeof(ps->iid_par[0]));
242  }
243  if (ps->enable_icc) {
244  memcpy(ps->icc_par+ps->num_env, ps->icc_par+source, sizeof(ps->icc_par[0]));
245  }
246  if (ps->enable_ipdopd) {
247  memcpy(ps->ipd_par+ps->num_env, ps->ipd_par+source, sizeof(ps->ipd_par[0]));
248  memcpy(ps->opd_par+ps->num_env, ps->opd_par+source, sizeof(ps->opd_par[0]));
249  }
250  }
251  ps->num_env++;
252  ps->border_position[ps->num_env] = numQMFSlots - 1;
253  }
254 
255 
256  ps->is34bands_old = ps->is34bands;
257  if (!PS_BASELINE && (ps->enable_iid || ps->enable_icc))
258  ps->is34bands = (ps->enable_iid && ps->nr_iid_par == 34) ||
259  (ps->enable_icc && ps->nr_icc_par == 34);
260 
261  //Baseline
262  if (!ps->enable_ipdopd) {
263  memset(ps->ipd_par, 0, sizeof(ps->ipd_par));
264  memset(ps->opd_par, 0, sizeof(ps->opd_par));
265  }
266 
267  if (header)
268  ps->start = 1;
269 
270  bits_consumed = get_bits_count(gb) - bit_count_start;
271  if (bits_consumed <= bits_left) {
272  skip_bits_long(gb_host, bits_consumed);
273  return bits_consumed;
274  }
275  av_log(avctx, AV_LOG_ERROR, "Expected to read %d PS bits actually read %d.\n", bits_left, bits_consumed);
276 err:
277  ps->start = 0;
278  skip_bits_long(gb_host, bits_left);
279  memset(ps->iid_par, 0, sizeof(ps->iid_par));
280  memset(ps->icc_par, 0, sizeof(ps->icc_par));
281  memset(ps->ipd_par, 0, sizeof(ps->ipd_par));
282  memset(ps->opd_par, 0, sizeof(ps->opd_par));
283  return bits_left;
284 }
285 
288 static void hybrid2_re(float (*in)[2], float (*out)[32][2], const float filter[8], int len, int reverse)
289 {
290  int i, j;
291  for (i = 0; i < len; i++, in++) {
292  float re_in = filter[6] * in[6][0]; //real inphase
293  float re_op = 0.0f; //real out of phase
294  float im_in = filter[6] * in[6][1]; //imag inphase
295  float im_op = 0.0f; //imag out of phase
296  for (j = 0; j < 6; j += 2) {
297  re_op += filter[j+1] * (in[j+1][0] + in[12-j-1][0]);
298  im_op += filter[j+1] * (in[j+1][1] + in[12-j-1][1]);
299  }
300  out[ reverse][i][0] = re_in + re_op;
301  out[ reverse][i][1] = im_in + im_op;
302  out[!reverse][i][0] = re_in - re_op;
303  out[!reverse][i][1] = im_in - im_op;
304  }
305 }
306 
308 static void hybrid6_cx(PSDSPContext *dsp, float (*in)[2], float (*out)[32][2], const float (*filter)[8][2], int len)
309 {
310  int i;
311  int N = 8;
312  LOCAL_ALIGNED_16(float, temp, [8], [2]);
313 
314  for (i = 0; i < len; i++, in++) {
315  dsp->hybrid_analysis(temp, in, filter, 1, N);
316  out[0][i][0] = temp[6][0];
317  out[0][i][1] = temp[6][1];
318  out[1][i][0] = temp[7][0];
319  out[1][i][1] = temp[7][1];
320  out[2][i][0] = temp[0][0];
321  out[2][i][1] = temp[0][1];
322  out[3][i][0] = temp[1][0];
323  out[3][i][1] = temp[1][1];
324  out[4][i][0] = temp[2][0] + temp[5][0];
325  out[4][i][1] = temp[2][1] + temp[5][1];
326  out[5][i][0] = temp[3][0] + temp[4][0];
327  out[5][i][1] = temp[3][1] + temp[4][1];
328  }
329 }
330 
331 static void hybrid4_8_12_cx(PSDSPContext *dsp, float (*in)[2], float (*out)[32][2], const float (*filter)[8][2], int N, int len)
332 {
333  int i;
334 
335  for (i = 0; i < len; i++, in++) {
336  dsp->hybrid_analysis(out[0] + i, in, filter, 32, N);
337  }
338 }
339 
340 static void hybrid_analysis(PSDSPContext *dsp, float out[91][32][2],
341  float in[5][44][2], float L[2][38][64],
342  int is34, int len)
343 {
344  int i, j;
345  for (i = 0; i < 5; i++) {
346  for (j = 0; j < 38; j++) {
347  in[i][j+6][0] = L[0][j][i];
348  in[i][j+6][1] = L[1][j][i];
349  }
350  }
351  if (is34) {
352  hybrid4_8_12_cx(dsp, in[0], out, f34_0_12, 12, len);
353  hybrid4_8_12_cx(dsp, in[1], out+12, f34_1_8, 8, len);
354  hybrid4_8_12_cx(dsp, in[2], out+20, f34_2_4, 4, len);
355  hybrid4_8_12_cx(dsp, in[3], out+24, f34_2_4, 4, len);
356  hybrid4_8_12_cx(dsp, in[4], out+28, f34_2_4, 4, len);
357  dsp->hybrid_analysis_ileave(out + 27, L, 5, len);
358  } else {
359  hybrid6_cx(dsp, in[0], out, f20_0_8, len);
360  hybrid2_re(in[1], out+6, g1_Q2, len, 1);
361  hybrid2_re(in[2], out+8, g1_Q2, len, 0);
362  dsp->hybrid_analysis_ileave(out + 7, L, 3, len);
363  }
364  //update in_buf
365  for (i = 0; i < 5; i++) {
366  memcpy(in[i], in[i]+32, 6 * sizeof(in[i][0]));
367  }
368 }
369 
370 static void hybrid_synthesis(PSDSPContext *dsp, float out[2][38][64],
371  float in[91][32][2], int is34, int len)
372 {
373  int i, n;
374  if (is34) {
375  for (n = 0; n < len; n++) {
376  memset(out[0][n], 0, 5*sizeof(out[0][n][0]));
377  memset(out[1][n], 0, 5*sizeof(out[1][n][0]));
378  for (i = 0; i < 12; i++) {
379  out[0][n][0] += in[ i][n][0];
380  out[1][n][0] += in[ i][n][1];
381  }
382  for (i = 0; i < 8; i++) {
383  out[0][n][1] += in[12+i][n][0];
384  out[1][n][1] += in[12+i][n][1];
385  }
386  for (i = 0; i < 4; i++) {
387  out[0][n][2] += in[20+i][n][0];
388  out[1][n][2] += in[20+i][n][1];
389  out[0][n][3] += in[24+i][n][0];
390  out[1][n][3] += in[24+i][n][1];
391  out[0][n][4] += in[28+i][n][0];
392  out[1][n][4] += in[28+i][n][1];
393  }
394  }
395  dsp->hybrid_synthesis_deint(out, in + 27, 5, len);
396  } else {
397  for (n = 0; n < len; n++) {
398  out[0][n][0] = in[0][n][0] + in[1][n][0] + in[2][n][0] +
399  in[3][n][0] + in[4][n][0] + in[5][n][0];
400  out[1][n][0] = in[0][n][1] + in[1][n][1] + in[2][n][1] +
401  in[3][n][1] + in[4][n][1] + in[5][n][1];
402  out[0][n][1] = in[6][n][0] + in[7][n][0];
403  out[1][n][1] = in[6][n][1] + in[7][n][1];
404  out[0][n][2] = in[8][n][0] + in[9][n][0];
405  out[1][n][2] = in[8][n][1] + in[9][n][1];
406  }
407  dsp->hybrid_synthesis_deint(out, in + 7, 3, len);
408  }
409 }
410 
412 #define DECAY_SLOPE 0.05f
413 static const int NR_PAR_BANDS[] = { 20, 34 };
416 static const int NR_BANDS[] = { 71, 91 };
418 static const int DECAY_CUTOFF[] = { 10, 32 };
420 static const int NR_ALLPASS_BANDS[] = { 30, 50 };
422 static const int SHORT_DELAY_BAND[] = { 42, 62 };
423 
425 static void map_idx_10_to_20(int8_t *par_mapped, const int8_t *par, int full)
426 {
427  int b;
428  if (full)
429  b = 9;
430  else {
431  b = 4;
432  par_mapped[10] = 0;
433  }
434  for (; b >= 0; b--) {
435  par_mapped[2*b+1] = par_mapped[2*b] = par[b];
436  }
437 }
438 
439 static void map_idx_34_to_20(int8_t *par_mapped, const int8_t *par, int full)
440 {
441  par_mapped[ 0] = (2*par[ 0] + par[ 1]) / 3;
442  par_mapped[ 1] = ( par[ 1] + 2*par[ 2]) / 3;
443  par_mapped[ 2] = (2*par[ 3] + par[ 4]) / 3;
444  par_mapped[ 3] = ( par[ 4] + 2*par[ 5]) / 3;
445  par_mapped[ 4] = ( par[ 6] + par[ 7]) / 2;
446  par_mapped[ 5] = ( par[ 8] + par[ 9]) / 2;
447  par_mapped[ 6] = par[10];
448  par_mapped[ 7] = par[11];
449  par_mapped[ 8] = ( par[12] + par[13]) / 2;
450  par_mapped[ 9] = ( par[14] + par[15]) / 2;
451  par_mapped[10] = par[16];
452  if (full) {
453  par_mapped[11] = par[17];
454  par_mapped[12] = par[18];
455  par_mapped[13] = par[19];
456  par_mapped[14] = ( par[20] + par[21]) / 2;
457  par_mapped[15] = ( par[22] + par[23]) / 2;
458  par_mapped[16] = ( par[24] + par[25]) / 2;
459  par_mapped[17] = ( par[26] + par[27]) / 2;
460  par_mapped[18] = ( par[28] + par[29] + par[30] + par[31]) / 4;
461  par_mapped[19] = ( par[32] + par[33]) / 2;
462  }
463 }
464 
465 static void map_val_34_to_20(float par[PS_MAX_NR_IIDICC])
466 {
467  par[ 0] = (2*par[ 0] + par[ 1]) * 0.33333333f;
468  par[ 1] = ( par[ 1] + 2*par[ 2]) * 0.33333333f;
469  par[ 2] = (2*par[ 3] + par[ 4]) * 0.33333333f;
470  par[ 3] = ( par[ 4] + 2*par[ 5]) * 0.33333333f;
471  par[ 4] = ( par[ 6] + par[ 7]) * 0.5f;
472  par[ 5] = ( par[ 8] + par[ 9]) * 0.5f;
473  par[ 6] = par[10];
474  par[ 7] = par[11];
475  par[ 8] = ( par[12] + par[13]) * 0.5f;
476  par[ 9] = ( par[14] + par[15]) * 0.5f;
477  par[10] = par[16];
478  par[11] = par[17];
479  par[12] = par[18];
480  par[13] = par[19];
481  par[14] = ( par[20] + par[21]) * 0.5f;
482  par[15] = ( par[22] + par[23]) * 0.5f;
483  par[16] = ( par[24] + par[25]) * 0.5f;
484  par[17] = ( par[26] + par[27]) * 0.5f;
485  par[18] = ( par[28] + par[29] + par[30] + par[31]) * 0.25f;
486  par[19] = ( par[32] + par[33]) * 0.5f;
487 }
488 
489 static void map_idx_10_to_34(int8_t *par_mapped, const int8_t *par, int full)
490 {
491  if (full) {
492  par_mapped[33] = par[9];
493  par_mapped[32] = par[9];
494  par_mapped[31] = par[9];
495  par_mapped[30] = par[9];
496  par_mapped[29] = par[9];
497  par_mapped[28] = par[9];
498  par_mapped[27] = par[8];
499  par_mapped[26] = par[8];
500  par_mapped[25] = par[8];
501  par_mapped[24] = par[8];
502  par_mapped[23] = par[7];
503  par_mapped[22] = par[7];
504  par_mapped[21] = par[7];
505  par_mapped[20] = par[7];
506  par_mapped[19] = par[6];
507  par_mapped[18] = par[6];
508  par_mapped[17] = par[5];
509  par_mapped[16] = par[5];
510  } else {
511  par_mapped[16] = 0;
512  }
513  par_mapped[15] = par[4];
514  par_mapped[14] = par[4];
515  par_mapped[13] = par[4];
516  par_mapped[12] = par[4];
517  par_mapped[11] = par[3];
518  par_mapped[10] = par[3];
519  par_mapped[ 9] = par[2];
520  par_mapped[ 8] = par[2];
521  par_mapped[ 7] = par[2];
522  par_mapped[ 6] = par[2];
523  par_mapped[ 5] = par[1];
524  par_mapped[ 4] = par[1];
525  par_mapped[ 3] = par[1];
526  par_mapped[ 2] = par[0];
527  par_mapped[ 1] = par[0];
528  par_mapped[ 0] = par[0];
529 }
530 
531 static void map_idx_20_to_34(int8_t *par_mapped, const int8_t *par, int full)
532 {
533  if (full) {
534  par_mapped[33] = par[19];
535  par_mapped[32] = par[19];
536  par_mapped[31] = par[18];
537  par_mapped[30] = par[18];
538  par_mapped[29] = par[18];
539  par_mapped[28] = par[18];
540  par_mapped[27] = par[17];
541  par_mapped[26] = par[17];
542  par_mapped[25] = par[16];
543  par_mapped[24] = par[16];
544  par_mapped[23] = par[15];
545  par_mapped[22] = par[15];
546  par_mapped[21] = par[14];
547  par_mapped[20] = par[14];
548  par_mapped[19] = par[13];
549  par_mapped[18] = par[12];
550  par_mapped[17] = par[11];
551  }
552  par_mapped[16] = par[10];
553  par_mapped[15] = par[ 9];
554  par_mapped[14] = par[ 9];
555  par_mapped[13] = par[ 8];
556  par_mapped[12] = par[ 8];
557  par_mapped[11] = par[ 7];
558  par_mapped[10] = par[ 6];
559  par_mapped[ 9] = par[ 5];
560  par_mapped[ 8] = par[ 5];
561  par_mapped[ 7] = par[ 4];
562  par_mapped[ 6] = par[ 4];
563  par_mapped[ 5] = par[ 3];
564  par_mapped[ 4] = (par[ 2] + par[ 3]) / 2;
565  par_mapped[ 3] = par[ 2];
566  par_mapped[ 2] = par[ 1];
567  par_mapped[ 1] = (par[ 0] + par[ 1]) / 2;
568  par_mapped[ 0] = par[ 0];
569 }
570 
571 static void map_val_20_to_34(float par[PS_MAX_NR_IIDICC])
572 {
573  par[33] = par[19];
574  par[32] = par[19];
575  par[31] = par[18];
576  par[30] = par[18];
577  par[29] = par[18];
578  par[28] = par[18];
579  par[27] = par[17];
580  par[26] = par[17];
581  par[25] = par[16];
582  par[24] = par[16];
583  par[23] = par[15];
584  par[22] = par[15];
585  par[21] = par[14];
586  par[20] = par[14];
587  par[19] = par[13];
588  par[18] = par[12];
589  par[17] = par[11];
590  par[16] = par[10];
591  par[15] = par[ 9];
592  par[14] = par[ 9];
593  par[13] = par[ 8];
594  par[12] = par[ 8];
595  par[11] = par[ 7];
596  par[10] = par[ 6];
597  par[ 9] = par[ 5];
598  par[ 8] = par[ 5];
599  par[ 7] = par[ 4];
600  par[ 6] = par[ 4];
601  par[ 5] = par[ 3];
602  par[ 4] = (par[ 2] + par[ 3]) * 0.5f;
603  par[ 3] = par[ 2];
604  par[ 2] = par[ 1];
605  par[ 1] = (par[ 0] + par[ 1]) * 0.5f;
606  par[ 0] = par[ 0];
607 }
608 
609 static void decorrelation(PSContext *ps, float (*out)[32][2], const float (*s)[32][2], int is34)
610 {
611  LOCAL_ALIGNED_16(float, power, [34], [PS_QMF_TIME_SLOTS]);
612  LOCAL_ALIGNED_16(float, transient_gain, [34], [PS_QMF_TIME_SLOTS]);
613  float *peak_decay_nrg = ps->peak_decay_nrg;
614  float *power_smooth = ps->power_smooth;
615  float *peak_decay_diff_smooth = ps->peak_decay_diff_smooth;
616  float (*delay)[PS_QMF_TIME_SLOTS + PS_MAX_DELAY][2] = ps->delay;
617  float (*ap_delay)[PS_AP_LINKS][PS_QMF_TIME_SLOTS + PS_MAX_AP_DELAY][2] = ps->ap_delay;
618  const int8_t *k_to_i = is34 ? k_to_i_34 : k_to_i_20;
619  const float peak_decay_factor = 0.76592833836465f;
620  const float transient_impact = 1.5f;
621  const float a_smooth = 0.25f;
622  int i, k, m, n;
623  int n0 = 0, nL = 32;
624 
625  memset(power, 0, 34 * sizeof(*power));
626 
627  if (is34 != ps->is34bands_old) {
628  memset(ps->peak_decay_nrg, 0, sizeof(ps->peak_decay_nrg));
629  memset(ps->power_smooth, 0, sizeof(ps->power_smooth));
630  memset(ps->peak_decay_diff_smooth, 0, sizeof(ps->peak_decay_diff_smooth));
631  memset(ps->delay, 0, sizeof(ps->delay));
632  memset(ps->ap_delay, 0, sizeof(ps->ap_delay));
633  }
634 
635  for (k = 0; k < NR_BANDS[is34]; k++) {
636  int i = k_to_i[k];
637  ps->dsp.add_squares(power[i], s[k], nL - n0);
638  }
639 
640  //Transient detection
641  for (i = 0; i < NR_PAR_BANDS[is34]; i++) {
642  for (n = n0; n < nL; n++) {
643  float decayed_peak = peak_decay_factor * peak_decay_nrg[i];
644  float denom;
645  peak_decay_nrg[i] = FFMAX(decayed_peak, power[i][n]);
646  power_smooth[i] += a_smooth * (power[i][n] - power_smooth[i]);
647  peak_decay_diff_smooth[i] += a_smooth * (peak_decay_nrg[i] - power[i][n] - peak_decay_diff_smooth[i]);
648  denom = transient_impact * peak_decay_diff_smooth[i];
649  transient_gain[i][n] = (denom > power_smooth[i]) ?
650  power_smooth[i] / denom : 1.0f;
651  }
652  }
653 
654  //Decorrelation and transient reduction
655  // PS_AP_LINKS - 1
656  // -----
657  // | | Q_fract_allpass[k][m]*z^-link_delay[m] - a[m]*g_decay_slope[k]
658  //H[k][z] = z^-2 * phi_fract[k] * | | ----------------------------------------------------------------
659  // | | 1 - a[m]*g_decay_slope[k]*Q_fract_allpass[k][m]*z^-link_delay[m]
660  // m = 0
661  //d[k][z] (out) = transient_gain_mapped[k][z] * H[k][z] * s[k][z]
662  for (k = 0; k < NR_ALLPASS_BANDS[is34]; k++) {
663  int b = k_to_i[k];
664  float g_decay_slope = 1.f - DECAY_SLOPE * (k - DECAY_CUTOFF[is34]);
665  g_decay_slope = av_clipf(g_decay_slope, 0.f, 1.f);
666  memcpy(delay[k], delay[k]+nL, PS_MAX_DELAY*sizeof(delay[k][0]));
667  memcpy(delay[k]+PS_MAX_DELAY, s[k], numQMFSlots*sizeof(delay[k][0]));
668  for (m = 0; m < PS_AP_LINKS; m++) {
669  memcpy(ap_delay[k][m], ap_delay[k][m]+numQMFSlots, 5*sizeof(ap_delay[k][m][0]));
670  }
671  ps->dsp.decorrelate(out[k], delay[k] + PS_MAX_DELAY - 2, ap_delay[k],
672  phi_fract[is34][k], Q_fract_allpass[is34][k],
673  transient_gain[b], g_decay_slope, nL - n0);
674  }
675  for (; k < SHORT_DELAY_BAND[is34]; k++) {
676  int i = k_to_i[k];
677  memcpy(delay[k], delay[k]+nL, PS_MAX_DELAY*sizeof(delay[k][0]));
678  memcpy(delay[k]+PS_MAX_DELAY, s[k], numQMFSlots*sizeof(delay[k][0]));
679  //H = delay 14
680  ps->dsp.mul_pair_single(out[k], delay[k] + PS_MAX_DELAY - 14,
681  transient_gain[i], nL - n0);
682  }
683  for (; k < NR_BANDS[is34]; k++) {
684  int i = k_to_i[k];
685  memcpy(delay[k], delay[k]+nL, PS_MAX_DELAY*sizeof(delay[k][0]));
686  memcpy(delay[k]+PS_MAX_DELAY, s[k], numQMFSlots*sizeof(delay[k][0]));
687  //H = delay 1
688  ps->dsp.mul_pair_single(out[k], delay[k] + PS_MAX_DELAY - 1,
689  transient_gain[i], nL - n0);
690  }
691 }
692 
693 static void remap34(int8_t (**p_par_mapped)[PS_MAX_NR_IIDICC],
694  int8_t (*par)[PS_MAX_NR_IIDICC],
695  int num_par, int num_env, int full)
696 {
697  int8_t (*par_mapped)[PS_MAX_NR_IIDICC] = *p_par_mapped;
698  int e;
699  if (num_par == 20 || num_par == 11) {
700  for (e = 0; e < num_env; e++) {
701  map_idx_20_to_34(par_mapped[e], par[e], full);
702  }
703  } else if (num_par == 10 || num_par == 5) {
704  for (e = 0; e < num_env; e++) {
705  map_idx_10_to_34(par_mapped[e], par[e], full);
706  }
707  } else {
708  *p_par_mapped = par;
709  }
710 }
711 
712 static void remap20(int8_t (**p_par_mapped)[PS_MAX_NR_IIDICC],
713  int8_t (*par)[PS_MAX_NR_IIDICC],
714  int num_par, int num_env, int full)
715 {
716  int8_t (*par_mapped)[PS_MAX_NR_IIDICC] = *p_par_mapped;
717  int e;
718  if (num_par == 34 || num_par == 17) {
719  for (e = 0; e < num_env; e++) {
720  map_idx_34_to_20(par_mapped[e], par[e], full);
721  }
722  } else if (num_par == 10 || num_par == 5) {
723  for (e = 0; e < num_env; e++) {
724  map_idx_10_to_20(par_mapped[e], par[e], full);
725  }
726  } else {
727  *p_par_mapped = par;
728  }
729 }
730 
731 static void stereo_processing(PSContext *ps, float (*l)[32][2], float (*r)[32][2], int is34)
732 {
733  int e, b, k;
734 
735  float (*H11)[PS_MAX_NUM_ENV+1][PS_MAX_NR_IIDICC] = ps->H11;
736  float (*H12)[PS_MAX_NUM_ENV+1][PS_MAX_NR_IIDICC] = ps->H12;
737  float (*H21)[PS_MAX_NUM_ENV+1][PS_MAX_NR_IIDICC] = ps->H21;
738  float (*H22)[PS_MAX_NUM_ENV+1][PS_MAX_NR_IIDICC] = ps->H22;
739  int8_t *opd_hist = ps->opd_hist;
740  int8_t *ipd_hist = ps->ipd_hist;
741  int8_t iid_mapped_buf[PS_MAX_NUM_ENV][PS_MAX_NR_IIDICC];
742  int8_t icc_mapped_buf[PS_MAX_NUM_ENV][PS_MAX_NR_IIDICC];
743  int8_t ipd_mapped_buf[PS_MAX_NUM_ENV][PS_MAX_NR_IIDICC];
744  int8_t opd_mapped_buf[PS_MAX_NUM_ENV][PS_MAX_NR_IIDICC];
745  int8_t (*iid_mapped)[PS_MAX_NR_IIDICC] = iid_mapped_buf;
746  int8_t (*icc_mapped)[PS_MAX_NR_IIDICC] = icc_mapped_buf;
747  int8_t (*ipd_mapped)[PS_MAX_NR_IIDICC] = ipd_mapped_buf;
748  int8_t (*opd_mapped)[PS_MAX_NR_IIDICC] = opd_mapped_buf;
749  const int8_t *k_to_i = is34 ? k_to_i_34 : k_to_i_20;
750  const float (*H_LUT)[8][4] = (PS_BASELINE || ps->icc_mode < 3) ? HA : HB;
751 
752  //Remapping
753  if (ps->num_env_old) {
754  memcpy(H11[0][0], H11[0][ps->num_env_old], PS_MAX_NR_IIDICC*sizeof(H11[0][0][0]));
755  memcpy(H11[1][0], H11[1][ps->num_env_old], PS_MAX_NR_IIDICC*sizeof(H11[1][0][0]));
756  memcpy(H12[0][0], H12[0][ps->num_env_old], PS_MAX_NR_IIDICC*sizeof(H12[0][0][0]));
757  memcpy(H12[1][0], H12[1][ps->num_env_old], PS_MAX_NR_IIDICC*sizeof(H12[1][0][0]));
758  memcpy(H21[0][0], H21[0][ps->num_env_old], PS_MAX_NR_IIDICC*sizeof(H21[0][0][0]));
759  memcpy(H21[1][0], H21[1][ps->num_env_old], PS_MAX_NR_IIDICC*sizeof(H21[1][0][0]));
760  memcpy(H22[0][0], H22[0][ps->num_env_old], PS_MAX_NR_IIDICC*sizeof(H22[0][0][0]));
761  memcpy(H22[1][0], H22[1][ps->num_env_old], PS_MAX_NR_IIDICC*sizeof(H22[1][0][0]));
762  }
763 
764  if (is34) {
765  remap34(&iid_mapped, ps->iid_par, ps->nr_iid_par, ps->num_env, 1);
766  remap34(&icc_mapped, ps->icc_par, ps->nr_icc_par, ps->num_env, 1);
767  if (ps->enable_ipdopd) {
768  remap34(&ipd_mapped, ps->ipd_par, ps->nr_ipdopd_par, ps->num_env, 0);
769  remap34(&opd_mapped, ps->opd_par, ps->nr_ipdopd_par, ps->num_env, 0);
770  }
771  if (!ps->is34bands_old) {
772  map_val_20_to_34(H11[0][0]);
773  map_val_20_to_34(H11[1][0]);
774  map_val_20_to_34(H12[0][0]);
775  map_val_20_to_34(H12[1][0]);
776  map_val_20_to_34(H21[0][0]);
777  map_val_20_to_34(H21[1][0]);
778  map_val_20_to_34(H22[0][0]);
779  map_val_20_to_34(H22[1][0]);
780  ipdopd_reset(ipd_hist, opd_hist);
781  }
782  } else {
783  remap20(&iid_mapped, ps->iid_par, ps->nr_iid_par, ps->num_env, 1);
784  remap20(&icc_mapped, ps->icc_par, ps->nr_icc_par, ps->num_env, 1);
785  if (ps->enable_ipdopd) {
786  remap20(&ipd_mapped, ps->ipd_par, ps->nr_ipdopd_par, ps->num_env, 0);
787  remap20(&opd_mapped, ps->opd_par, ps->nr_ipdopd_par, ps->num_env, 0);
788  }
789  if (ps->is34bands_old) {
790  map_val_34_to_20(H11[0][0]);
791  map_val_34_to_20(H11[1][0]);
792  map_val_34_to_20(H12[0][0]);
793  map_val_34_to_20(H12[1][0]);
794  map_val_34_to_20(H21[0][0]);
795  map_val_34_to_20(H21[1][0]);
796  map_val_34_to_20(H22[0][0]);
797  map_val_34_to_20(H22[1][0]);
798  ipdopd_reset(ipd_hist, opd_hist);
799  }
800  }
801 
802  //Mixing
803  for (e = 0; e < ps->num_env; e++) {
804  for (b = 0; b < NR_PAR_BANDS[is34]; b++) {
805  float h11, h12, h21, h22;
806  h11 = H_LUT[iid_mapped[e][b] + 7 + 23 * ps->iid_quant][icc_mapped[e][b]][0];
807  h12 = H_LUT[iid_mapped[e][b] + 7 + 23 * ps->iid_quant][icc_mapped[e][b]][1];
808  h21 = H_LUT[iid_mapped[e][b] + 7 + 23 * ps->iid_quant][icc_mapped[e][b]][2];
809  h22 = H_LUT[iid_mapped[e][b] + 7 + 23 * ps->iid_quant][icc_mapped[e][b]][3];
810  if (!PS_BASELINE && ps->enable_ipdopd && b < ps->nr_ipdopd_par) {
811  //The spec say says to only run this smoother when enable_ipdopd
812  //is set but the reference decoder appears to run it constantly
813  float h11i, h12i, h21i, h22i;
814  float ipd_adj_re, ipd_adj_im;
815  int opd_idx = opd_hist[b] * 8 + opd_mapped[e][b];
816  int ipd_idx = ipd_hist[b] * 8 + ipd_mapped[e][b];
817  float opd_re = pd_re_smooth[opd_idx];
818  float opd_im = pd_im_smooth[opd_idx];
819  float ipd_re = pd_re_smooth[ipd_idx];
820  float ipd_im = pd_im_smooth[ipd_idx];
821  opd_hist[b] = opd_idx & 0x3F;
822  ipd_hist[b] = ipd_idx & 0x3F;
823 
824  ipd_adj_re = opd_re*ipd_re + opd_im*ipd_im;
825  ipd_adj_im = opd_im*ipd_re - opd_re*ipd_im;
826  h11i = h11 * opd_im;
827  h11 = h11 * opd_re;
828  h12i = h12 * ipd_adj_im;
829  h12 = h12 * ipd_adj_re;
830  h21i = h21 * opd_im;
831  h21 = h21 * opd_re;
832  h22i = h22 * ipd_adj_im;
833  h22 = h22 * ipd_adj_re;
834  H11[1][e+1][b] = h11i;
835  H12[1][e+1][b] = h12i;
836  H21[1][e+1][b] = h21i;
837  H22[1][e+1][b] = h22i;
838  }
839  H11[0][e+1][b] = h11;
840  H12[0][e+1][b] = h12;
841  H21[0][e+1][b] = h21;
842  H22[0][e+1][b] = h22;
843  }
844  for (k = 0; k < NR_BANDS[is34]; k++) {
845  float h[2][4];
846  float h_step[2][4];
847  int start = ps->border_position[e];
848  int stop = ps->border_position[e+1];
849  float width = 1.f / (stop - start);
850  b = k_to_i[k];
851  h[0][0] = H11[0][e][b];
852  h[0][1] = H12[0][e][b];
853  h[0][2] = H21[0][e][b];
854  h[0][3] = H22[0][e][b];
855  if (!PS_BASELINE && ps->enable_ipdopd) {
856  //Is this necessary? ps_04_new seems unchanged
857  if ((is34 && k <= 13 && k >= 9) || (!is34 && k <= 1)) {
858  h[1][0] = -H11[1][e][b];
859  h[1][1] = -H12[1][e][b];
860  h[1][2] = -H21[1][e][b];
861  h[1][3] = -H22[1][e][b];
862  } else {
863  h[1][0] = H11[1][e][b];
864  h[1][1] = H12[1][e][b];
865  h[1][2] = H21[1][e][b];
866  h[1][3] = H22[1][e][b];
867  }
868  }
869  //Interpolation
870  h_step[0][0] = (H11[0][e+1][b] - h[0][0]) * width;
871  h_step[0][1] = (H12[0][e+1][b] - h[0][1]) * width;
872  h_step[0][2] = (H21[0][e+1][b] - h[0][2]) * width;
873  h_step[0][3] = (H22[0][e+1][b] - h[0][3]) * width;
874  if (!PS_BASELINE && ps->enable_ipdopd) {
875  h_step[1][0] = (H11[1][e+1][b] - h[1][0]) * width;
876  h_step[1][1] = (H12[1][e+1][b] - h[1][1]) * width;
877  h_step[1][2] = (H21[1][e+1][b] - h[1][2]) * width;
878  h_step[1][3] = (H22[1][e+1][b] - h[1][3]) * width;
879  }
881  l[k] + start + 1, r[k] + start + 1,
882  h, h_step, stop - start);
883  }
884  }
885 }
886 
887 int ff_ps_apply(AVCodecContext *avctx, PSContext *ps, float L[2][38][64], float R[2][38][64], int top)
888 {
889  LOCAL_ALIGNED_16(float, Lbuf, [91], [32][2]);
890  LOCAL_ALIGNED_16(float, Rbuf, [91], [32][2]);
891  const int len = 32;
892  int is34 = ps->is34bands;
893 
894  top += NR_BANDS[is34] - 64;
895  memset(ps->delay+top, 0, (NR_BANDS[is34] - top)*sizeof(ps->delay[0]));
896  if (top < NR_ALLPASS_BANDS[is34])
897  memset(ps->ap_delay + top, 0, (NR_ALLPASS_BANDS[is34] - top)*sizeof(ps->ap_delay[0]));
898 
899  hybrid_analysis(&ps->dsp, Lbuf, ps->in_buf, L, is34, len);
900  decorrelation(ps, Rbuf, Lbuf, is34);
901  stereo_processing(ps, Lbuf, Rbuf, is34);
902  hybrid_synthesis(&ps->dsp, L, Lbuf, is34, len);
903  hybrid_synthesis(&ps->dsp, R, Rbuf, is34, len);
904 
905  return 0;
906 }
907 
908 #define PS_INIT_VLC_STATIC(num, size) \
909  INIT_VLC_STATIC(&vlc_ps[num], 9, ps_tmp[num].table_size / ps_tmp[num].elem_size, \
910  ps_tmp[num].ps_bits, 1, 1, \
911  ps_tmp[num].ps_codes, ps_tmp[num].elem_size, ps_tmp[num].elem_size, \
912  size);
913 
914 #define PS_VLC_ROW(name) \
915  { name ## _codes, name ## _bits, sizeof(name ## _codes), sizeof(name ## _codes[0]) }
916 
917 av_cold void ff_ps_init(void) {
918  // Syntax initialization
919  static const struct {
920  const void *ps_codes, *ps_bits;
921  const unsigned int table_size, elem_size;
922  } ps_tmp[] = {
933  };
934 
935  PS_INIT_VLC_STATIC(0, 1544);
936  PS_INIT_VLC_STATIC(1, 832);
937  PS_INIT_VLC_STATIC(2, 1024);
938  PS_INIT_VLC_STATIC(3, 1036);
939  PS_INIT_VLC_STATIC(4, 544);
940  PS_INIT_VLC_STATIC(5, 544);
941  PS_INIT_VLC_STATIC(6, 512);
942  PS_INIT_VLC_STATIC(7, 512);
943  PS_INIT_VLC_STATIC(8, 512);
944  PS_INIT_VLC_STATIC(9, 512);
945 
946  ps_tableinit();
947 }
948 
950 {
951  ff_psdsp_init(&ps->dsp);
952 }