-
Notifications
You must be signed in to change notification settings - Fork 1
/
Copy pathdec_amr.c
2333 lines (1964 loc) · 69.8 KB
/
dec_amr.c
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
/* ------------------------------------------------------------------
* Copyright (C) 1998-2009 PacketVideo
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
* express or implied.
* See the License for the specific language governing permissions
* and limitations under the License.
* -------------------------------------------------------------------
*/
/****************************************************************************************
Portions of this file are derived from the following 3GPP standard:
3GPP TS 26.073
ANSI-C code for the Adaptive Multi-Rate (AMR) speech codec
Available from http://www.3gpp.org
(C) 2004, 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TTA, TTC)
Permission to distribute, modify and use this file under the standard license
terms listed above has been obtained from the copyright holder.
****************************************************************************************/
/*
------------------------------------------------------------------------------
Filename: dec_amr.cpp
Funtions: Decoder_amr_init
Decoder_amr_reset
Decoder_amr
------------------------------------------------------------------------------
MODULE DESCRIPTION
This file contains the function used to decode one speech frame using a given
codec mode. The functions used to initialize, reset, and exit are also
included in this file.
------------------------------------------------------------------------------
*/
/*----------------------------------------------------------------------------
; INCLUDES
----------------------------------------------------------------------------*/
#include "dec_amr.h"
#include "typedef.h"
#include "cnst.h"
#include "set_zero.h"
#include "syn_filt.h"
#include "d_plsf.h"
#include "agc.h"
#include "int_lpc.h"
#include "dec_gain.h"
#include "dec_lag3.h"
#include "dec_lag6.h"
#include "d2_9pf.h"
#include "d2_11pf.h"
#include "d3_14pf.h"
#include "d4_17pf.h"
#include "d8_31pf.h"
#include "d1035pf.h"
#include "pred_lt.h"
#include "d_gain_p.h"
#include "d_gain_c.h"
#include "dec_gain.h"
#include "ec_gains.h"
#include "ph_disp.h"
#include "c_g_aver.h"
#include "int_lsf.h"
#include "lsp_lsf.h"
#include "lsp_avg.h"
#include "bgnscd.h"
#include "ex_ctrl.h"
#include "sqrt_l.h"
#include "frame.h"
#include "b_cn_cod.h"
#include "basic_op.h"
#include "oscl_mem.h"
/*----------------------------------------------------------------------------
; MACROS
; Define module specific macros here
----------------------------------------------------------------------------*/
/*----------------------------------------------------------------------------
; DEFINES
; Include all pre-processor statements here. Include conditional
; compile variables also.
----------------------------------------------------------------------------*/
/*----------------------------------------------------------------------------
; LOCAL FUNCTION DEFINITIONS
; Function Prototype declaration
----------------------------------------------------------------------------*/
/*----------------------------------------------------------------------------
; LOCAL VARIABLE DEFINITIONS
; Variable declaration - defined here and used outside this module
----------------------------------------------------------------------------*/
/*
------------------------------------------------------------------------------
FUNCTION NAME: Decoder_amr_init
------------------------------------------------------------------------------
INPUT AND OUTPUT DEFINITIONS
Inputs:
state = pointer to a pointer to structures of type Decoder_amrState
Outputs:
structure pointed to by the pointer which is pointed to by state is
initialized to each field's initial values
state pointer points to the address of the memory allocated by
Decoder_amr_init function
Returns:
return_value = 0, if the initialization was successful; -1, otherwise (int)
Global Variables Used:
None
Local Variables Needed:
None
------------------------------------------------------------------------------
FUNCTION DESCRIPTION
This function allocates and initializes state memory used by the Decoder_amr
function. It stores the pointer to the filter status structure in state. This
pointer has to be passed to Decoder_amr in each call. The function returns
0, if initialization was successful and -1, otherwise.
------------------------------------------------------------------------------
REQUIREMENTS
None
------------------------------------------------------------------------------
REFERENCES
dec_amr.c, UMTS GSM AMR speech codec, R99 - Version 3.2.0, March 2, 2001
------------------------------------------------------------------------------
PSEUDO-CODE
int Decoder_amr_init (Decoder_amrState **state)
{
Decoder_amrState* s;
Word16 i;
if (state == (Decoder_amrState **) NULL){
fprintf(stderr, "Decoder_amr_init: invalid parameter\n");
return -1;
}
*state = NULL;
// allocate memory
if ((s= (Decoder_amrState *) malloc(sizeof(Decoder_amrState))) == NULL){
fprintf(stderr, "Decoder_amr_init: can not malloc state structure\n");
return -1;
}
s->T0_lagBuff = 40;
s->inBackgroundNoise = 0;
s->voicedHangover = 0;
for (i = 0; i < 9; i++)
s->ltpGainHistory[i] = 0;
s->lsfState = NULL;
s->ec_gain_p_st = NULL;
s->ec_gain_c_st = NULL;
s->pred_state = NULL;
s->ph_disp_st = NULL;
s->dtxDecoderState = NULL;
if (D_plsf_init(&s->lsfState) ||
ec_gain_pitch_init(&s->ec_gain_p_st) ||
ec_gain_code_init(&s->ec_gain_c_st) ||
gc_pred_init(&s->pred_state) ||
Cb_gain_average_init(&s->Cb_gain_averState) ||
lsp_avg_init(&s->lsp_avg_st) ||
Bgn_scd_init(&s->background_state) ||
ph_disp_init(&s->ph_disp_st) ||
dtx_dec_init(&s->dtxDecoderState)) {
Decoder_amr_exit(&s);
return -1;
}
Decoder_amr_reset(s, (enum Mode)0);
*state = s;
return 0;
}
------------------------------------------------------------------------------
CAUTION [optional]
[State any special notes, constraints or cautions for users of this function]
------------------------------------------------------------------------------
*/
Word16 Decoder_amr_init(Decoder_amrState *s)
{
Word16 i;
if (s == (Decoder_amrState *) NULL)
{
/* fprint(stderr, "Decoder_amr_init: invalid parameter\n"); */
return(-1);
}
get_const_tbls(&s->common_amr_tbls);
s->T0_lagBuff = 40;
s->inBackgroundNoise = 0;
s->voicedHangover = 0;
/* Initialize overflow Flag */
s->overflow = 0;
for (i = 0; i < LTP_GAIN_HISTORY_LEN; i++)
{
s->ltpGainHistory[i] = 0;
}
D_plsf_reset(&s->lsfState, s->common_amr_tbls.mean_lsf_5_ptr);
ec_gain_pitch_reset(&s->ec_gain_p_st);
ec_gain_code_reset(&s->ec_gain_c_st);
Cb_gain_average_reset(&s->Cb_gain_averState);
lsp_avg_reset(&s->lsp_avg_st, s->common_amr_tbls.mean_lsf_5_ptr);
Bgn_scd_reset(&s->background_state);
ph_disp_reset(&s->ph_disp_st);
dtx_dec_reset(&s->dtxDecoderState);
gc_pred_reset(&s->pred_state);
Decoder_amr_reset(s, MR475);
return(0);
}
/****************************************************************************/
/*
------------------------------------------------------------------------------
FUNCTION NAME: Decoder_amr_reset
------------------------------------------------------------------------------
INPUT AND OUTPUT DEFINITIONS
Inputs:
state = pointer to a structure of type Decoder_amrState
mode = codec mode (enum Mode)
Outputs:
structure pointed to by state is initialized to its reset value
Returns:
return_value = 0, if reset was successful; -1, otherwise (int)
Global Variables Used:
None
Local Variables Needed:
None
------------------------------------------------------------------------------
FUNCTION DESCRIPTION
This function resets the state memory used by the Decoder_amr function. It
returns a 0, if reset was successful and -1, otherwise.
------------------------------------------------------------------------------
REQUIREMENTS
None
------------------------------------------------------------------------------
REFERENCES
dec_amr.c, UMTS GSM AMR speech codec, R99 - Version 3.2.0, March 2, 2001
------------------------------------------------------------------------------
PSEUDO-CODE
int Decoder_amr_reset (Decoder_amrState *state, enum Mode mode)
{
Word16 i;
if (state == (Decoder_amrState *) NULL){
fprintf(stderr, "Decoder_amr_reset: invalid parameter\n");
return -1;
}
// Initialize static pointer
state->exc = state->old_exc + PIT_MAX + L_INTERPOL;
// Static vectors to zero
Set_zero (state->old_exc, PIT_MAX + L_INTERPOL);
if (mode != MRDTX)
Set_zero (state->mem_syn, M);
// initialize pitch sharpening
state->sharp = SHARPMIN;
state->old_T0 = 40;
// Initialize state->lsp_old []
if (mode != MRDTX) {
Copy(lsp_init_data, &state->lsp_old[0], M);
}
// Initialize memories of bad frame handling
state->prev_bf = 0;
state->prev_pdf = 0;
state->state = 0;
state->T0_lagBuff = 40;
state->inBackgroundNoise = 0;
state->voicedHangover = 0;
if (mode != MRDTX) {
for (i=0;i<9;i++)
state->excEnergyHist[i] = 0;
}
for (i = 0; i < 9; i++)
state->ltpGainHistory[i] = 0;
Cb_gain_average_reset(state->Cb_gain_averState);
if (mode != MRDTX)
lsp_avg_reset(state->lsp_avg_st);
D_plsf_reset(state->lsfState);
ec_gain_pitch_reset(state->ec_gain_p_st);
ec_gain_code_reset(state->ec_gain_c_st);
if (mode != MRDTX)
gc_pred_reset(state->pred_state);
Bgn_scd_reset(state->background_state);
state->nodataSeed = 21845;
ph_disp_reset(state->ph_disp_st);
if (mode != MRDTX)
dtx_dec_reset(state->dtxDecoderState);
return 0;
}
------------------------------------------------------------------------------
CAUTION [optional]
[State any special notes, constraints or cautions for users of this function]
------------------------------------------------------------------------------
*/
Word16 Decoder_amr_reset(Decoder_amrState *state, enum Mode mode)
{
Word16 i;
if (state == (Decoder_amrState *) NULL)
{
/* fprint(stderr, "Decoder_amr_reset: invalid parameter\n"); */
return(-1);
}
/* Initialize static pointer */
state->exc = state->old_exc + PIT_MAX + L_INTERPOL;
/* Static vectors to zero */
oscl_memset(state->old_exc, 0, sizeof(Word16)*(PIT_MAX + L_INTERPOL));
if (mode != MRDTX)
{
oscl_memset(state->mem_syn, 0, sizeof(Word16)*M);
}
/* initialize pitch sharpening */
state->sharp = SHARPMIN;
state->old_T0 = 40;
/* Initialize overflow Flag */
state->overflow = 0;
/* Initialize state->lsp_old [] */
if (mode != MRDTX)
{
state->lsp_old[0] = 30000;
state->lsp_old[1] = 26000;
state->lsp_old[2] = 21000;
state->lsp_old[3] = 15000;
state->lsp_old[4] = 8000;
state->lsp_old[5] = 0;
state->lsp_old[6] = -8000;
state->lsp_old[7] = -15000;
state->lsp_old[8] = -21000;
state->lsp_old[9] = -26000;
}
/* Initialize memories of bad frame handling */
state->prev_bf = 0;
state->prev_pdf = 0;
state->state = 0;
state->T0_lagBuff = 40;
state->inBackgroundNoise = 0;
state->voicedHangover = 0;
if (mode != MRDTX)
{
for (i = 0; i < EXC_ENERGY_HIST_LEN; i++)
{
state->excEnergyHist[i] = 0;
}
}
for (i = 0; i < LTP_GAIN_HISTORY_LEN; i++)
{
state->ltpGainHistory[i] = 0;
}
Cb_gain_average_reset(&(state->Cb_gain_averState));
if (mode != MRDTX)
{
lsp_avg_reset(&(state->lsp_avg_st), state->common_amr_tbls.mean_lsf_5_ptr);
}
D_plsf_reset(&(state->lsfState), state->common_amr_tbls.mean_lsf_5_ptr);
ec_gain_pitch_reset(&(state->ec_gain_p_st));
ec_gain_code_reset(&(state->ec_gain_c_st));
if (mode != MRDTX)
{
gc_pred_reset(&(state->pred_state));
}
Bgn_scd_reset(&(state->background_state));
state->nodataSeed = 21845;
ph_disp_reset(&(state->ph_disp_st));
if (mode != MRDTX)
{
dtx_dec_reset(&(state->dtxDecoderState));
}
return(0);
}
/****************************************************************************/
/*
------------------------------------------------------------------------------
FUNCTION NAME: Decoder_amr
------------------------------------------------------------------------------
INPUT AND OUTPUT DEFINITIONS
Inputs:
st = pointer to a structure of type Decoder_amrState
mode = codec mode (enum Mode)
parm = buffer of synthesis parameters (Word16)
frame_type = received frame type (enum RXFrameType)
synth = buffer containing synthetic speech (Word16)
A_t = buffer containing decoded LP filter in 4 subframes (Word16)
Outputs:
structure pointed to by st contains the newly calculated decoder
parameters
synth buffer contains the decoded speech samples
A_t buffer contains the decoded LP filter parameters
Returns:
return_value = 0 (int)
Global Variables Used:
None
Local Variables Needed:
None
------------------------------------------------------------------------------
FUNCTION DESCRIPTION
This function performs the decoding of one speech frame for a given codec
mode.
------------------------------------------------------------------------------
REQUIREMENTS
None
------------------------------------------------------------------------------
REFERENCES
dec_amr.c, UMTS GSM AMR speech codec, R99 - Version 3.2.0, March 2, 2001
------------------------------------------------------------------------------
PSEUDO-CODE
int Decoder_amr (
Decoder_amrState *st, // i/o : State variables
enum Mode mode, // i : AMR mode
Word16 parm[], // i : vector of synthesis parameters
(PRM_SIZE)
enum RXFrameType frame_type, // i : received frame type
Word16 synth[], // o : synthesis speech (L_FRAME)
Word16 A_t[] // o : decoded LP filter in 4 subframes
(AZ_SIZE)
)
{
// LPC coefficients
Word16 *Az; // Pointer on A_t
// LSPs
Word16 lsp_new[M];
Word16 lsp_mid[M];
// LSFs
Word16 prev_lsf[M];
Word16 lsf_i[M];
// Algebraic codevector
Word16 code[L_SUBFR];
// excitation
Word16 excp[L_SUBFR];
Word16 exc_enhanced[L_SUBFR];
// Scalars
Word16 i, i_subfr;
Word16 T0, T0_frac, index, index_mr475 = 0;
Word16 gain_pit, gain_code, gain_code_mix, pit_sharp, pit_flag, pitch_fac;
Word16 t0_min, t0_max;
Word16 delta_frc_low, delta_frc_range;
Word16 tmp_shift;
Word16 temp;
Word32 L_temp;
Word16 flag4;
Word16 carefulFlag;
Word16 excEnergy;
Word16 subfrNr;
Word16 evenSubfr = 0;
Word16 bfi = 0; // bad frame indication flag
Word16 pdfi = 0; // potential degraded bad frame flag
enum DTXStateType newDTXState; // SPEECH , DTX, DTX_MUTE
// find the new DTX state SPEECH OR DTX
newDTXState = rx_dtx_handler(st->dtxDecoderState, frame_type);
// DTX actions
if (sub(newDTXState, SPEECH) != 0 )
{
Decoder_amr_reset (st, MRDTX);
dtx_dec(st->dtxDecoderState,
st->mem_syn,
st->lsfState,
st->pred_state,
st->Cb_gain_averState,
newDTXState,
mode,
parm, synth, A_t);
// update average lsp
Lsf_lsp(st->lsfState->past_lsf_q, st->lsp_old, M);
lsp_avg(st->lsp_avg_st, st->lsfState->past_lsf_q);
goto the_end;
}
// SPEECH action state machine
if ((sub(frame_type, RX_SPEECH_BAD) == 0) ||
(sub(frame_type, RX_NO_DATA) == 0) ||
(sub(frame_type, RX_ONSET) == 0))
{
bfi = 1;
if ((sub(frame_type, RX_NO_DATA) == 0) ||
(sub(frame_type, RX_ONSET) == 0))
{
build_CN_param(&st->nodataSeed,
prmno[mode],
bitno[mode],
parm);
}
}
else if (sub(frame_type, RX_SPEECH_DEGRADED) == 0)
{
pdfi = 1;
}
if (bfi != 0)
{
st->state = add (st->state, 1);
}
else if (sub (st->state, 6) == 0)
{
st->state = 5;
}
else
{
st->state = 0;
}
if (sub (st->state, 6) > 0)
{
st->state = 6;
}
// If this frame is the first speech frame after CNI period,
// set the BFH state machine to an appropriate state depending
// on whether there was DTX muting before start of speech or not
// If there was DTX muting, the first speech frame is muted.
// If there was no DTX muting, the first speech frame is not
// muted. The BFH state machine starts from state 5, however, to
// keep the audible noise resulting from a SID frame which is
// erroneously interpreted as a good speech frame as small as
// possible (the decoder output in this case is quickly muted)
if (sub(st->dtxDecoderState->dtxGlobalState, DTX) == 0)
{
st->state = 5;
st->prev_bf = 0;
}
else if (sub(st->dtxDecoderState->dtxGlobalState, DTX_MUTE) == 0)
{
st->state = 5;
st->prev_bf = 1;
}
// save old LSFs for CB gain smoothing
Copy (st->lsfState->past_lsf_q, prev_lsf, M);
// decode LSF parameters and generate interpolated lpc coefficients
for the 4 subframes
if (sub (mode, MR122) != 0)
{
D_plsf_3(st->lsfState, mode, bfi, parm, lsp_new);
// Advance synthesis parameters pointer
parm += 3;
Int_lpc_1to3(st->lsp_old, lsp_new, A_t);
}
else
{
D_plsf_5 (st->lsfState, bfi, parm, lsp_mid, lsp_new);
// Advance synthesis parameters pointer
parm += 5;
Int_lpc_1and3 (st->lsp_old, lsp_mid, lsp_new, A_t);
}
// update the LSPs for the next frame
for (i = 0; i < M; i++)
{
st->lsp_old[i] = lsp_new[i];
}
*------------------------------------------------------------------------*
* Loop for every subframe in the analysis frame *
*------------------------------------------------------------------------*
* The subframe size is L_SUBFR and the loop is repeated L_FRAME/L_SUBFR *
* times *
* - decode the pitch delay *
* - decode algebraic code *
* - decode pitch and codebook gains *
* - find the excitation and compute synthesis speech *
*------------------------------------------------------------------------*
// pointer to interpolated LPC parameters
Az = A_t;
evenSubfr = 0;
subfrNr = -1;
for (i_subfr = 0; i_subfr < L_FRAME; i_subfr += L_SUBFR)
{
subfrNr = add(subfrNr, 1);
evenSubfr = sub(1, evenSubfr);
// flag for first and 3th subframe
pit_flag = i_subfr;
if (sub (i_subfr, L_FRAME_BY2) == 0)
{
if (sub(mode, MR475) != 0 && sub(mode, MR515) != 0)
{
pit_flag = 0;
}
}
// pitch index
index = *parm++;
*-------------------------------------------------------*
* - decode pitch lag and find adaptive codebook vector. *
*-------------------------------------------------------*
if (sub(mode, MR122) != 0)
{
// flag4 indicates encoding with 4 bit resolution;
// this is needed for mode MR475, MR515, MR59 and MR67
flag4 = 0;
if ((sub (mode, MR475) == 0) ||
(sub (mode, MR515) == 0) ||
(sub (mode, MR59) == 0) ||
(sub (mode, MR67) == 0) ) {
flag4 = 1;
}
*-------------------------------------------------------*
* - get ranges for the t0_min and t0_max *
* - only needed in delta decoding *
*-------------------------------------------------------*
delta_frc_low = 5;
delta_frc_range = 9;
if ( sub(mode, MR795) == 0 )
{
delta_frc_low = 10;
delta_frc_range = 19;
}
t0_min = sub(st->old_T0, delta_frc_low);
if (sub(t0_min, PIT_MIN) < 0)
{
t0_min = PIT_MIN;
}
t0_max = add(t0_min, delta_frc_range);
if (sub(t0_max, PIT_MAX) > 0)
{
t0_max = PIT_MAX;
t0_min = sub(t0_max, delta_frc_range);
}
Dec_lag3 (index, t0_min, t0_max, pit_flag, st->old_T0,
&T0, &T0_frac, flag4);
st->T0_lagBuff = T0;
if (bfi != 0)
{
if (sub (st->old_T0, PIT_MAX) < 0)
{ // Graceful pitch
st->old_T0 = add(st->old_T0, 1); // degradation
}
T0 = st->old_T0;
T0_frac = 0;
if ( st->inBackgroundNoise != 0 &&
sub(st->voicedHangover, 4) > 0 &&
((sub(mode, MR475) == 0 ) ||
(sub(mode, MR515) == 0 ) ||
(sub(mode, MR59) == 0) )
)
{
T0 = st->T0_lagBuff;
}
}
Pred_lt_3or6 (st->exc, T0, T0_frac, L_SUBFR, 1);
}
else
{
Dec_lag6 (index, PIT_MIN_MR122,
PIT_MAX, pit_flag, &T0, &T0_frac);
if ( bfi == 0 && (pit_flag == 0 || sub (index, 61) < 0))
{
}
else
{
st->T0_lagBuff = T0;
T0 = st->old_T0;
T0_frac = 0;
}
Pred_lt_3or6 (st->exc, T0, T0_frac, L_SUBFR, 0);
}
*-------------------------------------------------------*
* - (MR122 only: Decode pitch gain.) *
* - Decode innovative codebook. *
* - set pitch sharpening factor *
*-------------------------------------------------------*
if (sub (mode, MR475) == 0 || sub (mode, MR515) == 0)
{ // MR475, MR515
index = *parm++; // index of position
i = *parm++; // signs
decode_2i40_9bits (subfrNr, i, index, code);
pit_sharp = shl (st->sharp, 1);
}
else if (sub (mode, MR59) == 0)
{ // MR59
index = *parm++; // index of position
i = *parm++; // signs
decode_2i40_11bits (i, index, code);
pit_sharp = shl (st->sharp, 1);
}
else if (sub (mode, MR67) == 0)
{ // MR67
index = *parm++; // index of position
i = *parm++; // signs
decode_3i40_14bits (i, index, code);
pit_sharp = shl (st->sharp, 1);
}
else if (sub (mode, MR795) <= 0)
{ // MR74, MR795
index = *parm++; // index of position
i = *parm++; // signs
decode_4i40_17bits (i, index, code);
pit_sharp = shl (st->sharp, 1);
}
else if (sub (mode, MR102) == 0)
{ // MR102
dec_8i40_31bits (parm, code);
parm += 7;
pit_sharp = shl (st->sharp, 1);
}
else
{ // MR122
index = *parm++;
if (bfi != 0)
{
ec_gain_pitch (st->ec_gain_p_st, st->state, &gain_pit);
}
else
{
gain_pit = d_gain_pitch (mode, index);
}
ec_gain_pitch_update (st->ec_gain_p_st, bfi, st->prev_bf,
&gain_pit);
dec_10i40_35bits (parm, code);
parm += 10;
// pit_sharp = gain_pit;
// if (pit_sharp > 1.0) pit_sharp = 1.0;
pit_sharp = shl (gain_pit, 1);
}
*-------------------------------------------------------*
* - Add the pitch contribution to code[]. *
*-------------------------------------------------------*
for (i = T0; i < L_SUBFR; i++)
{
temp = mult (code[i - T0], pit_sharp);
code[i] = add (code[i], temp);
}
*------------------------------------------------------------*
* - Decode codebook gain (MR122) or both pitch *
* gain and codebook gain (all others) *
* - Update pitch sharpening "sharp" with quantized gain_pit *
*------------------------------------------------------------*
if (sub (mode, MR475) == 0)
{
// read and decode pitch and code gain
if (evenSubfr != 0)
{
index_mr475 = *parm++; // index of gain(s)
}
if (bfi == 0)
{
Dec_gain(st->pred_state, mode, index_mr475, code,
evenSubfr, &gain_pit, &gain_code);
}
else
{
ec_gain_pitch (st->ec_gain_p_st, st->state, &gain_pit);
ec_gain_code (st->ec_gain_c_st, st->pred_state, st->state,
&gain_code);
}
ec_gain_pitch_update (st->ec_gain_p_st, bfi, st->prev_bf,
&gain_pit);
ec_gain_code_update (st->ec_gain_c_st, bfi, st->prev_bf,
&gain_code);
pit_sharp = gain_pit;
if (sub (pit_sharp, SHARPMAX) > 0)
{
pit_sharp = SHARPMAX;
}
}
else if ((sub (mode, MR74) <= 0) ||
(sub (mode, MR102) == 0))
{
// read and decode pitch and code gain
index = *parm++; // index of gain(s)
if (bfi == 0)
{
Dec_gain(st->pred_state, mode, index, code,
evenSubfr, &gain_pit, &gain_code);
}
else
{
ec_gain_pitch (st->ec_gain_p_st, st->state, &gain_pit);
ec_gain_code (st->ec_gain_c_st, st->pred_state, st->state,
&gain_code);
}
ec_gain_pitch_update (st->ec_gain_p_st, bfi, st->prev_bf,
&gain_pit);
ec_gain_code_update (st->ec_gain_c_st, bfi, st->prev_bf,
&gain_code);
pit_sharp = gain_pit;
if (sub (pit_sharp, SHARPMAX) > 0)
{
pit_sharp = SHARPMAX;
}
if (sub (mode, MR102) == 0)
{
if (sub (st->old_T0, add(L_SUBFR, 5)) > 0)
{
pit_sharp = shr(pit_sharp, 2);
}
}
}
else
{
// read and decode pitch gain
index = *parm++; // index of gain(s)
if (sub (mode, MR795) == 0)
{
// decode pitch gain
if (bfi != 0)
{
ec_gain_pitch (st->ec_gain_p_st, st->state, &gain_pit);
}
else
{
gain_pit = d_gain_pitch (mode, index);
}
ec_gain_pitch_update (st->ec_gain_p_st, bfi, st->prev_bf,
&gain_pit);
// read and decode code gain
index = *parm++;
if (bfi == 0)
{
d_gain_code (st->pred_state, mode, index, code, &gain_code);
}
else
{
ec_gain_code (st->ec_gain_c_st, st->pred_state, st->state,
&gain_code);
}
ec_gain_code_update (st->ec_gain_c_st, bfi, st->prev_bf,
&gain_code);
pit_sharp = gain_pit;
if (sub (pit_sharp, SHARPMAX) > 0)
{
pit_sharp = SHARPMAX;
}
}
else
{ // MR122
if (bfi == 0)
{
d_gain_code (st->pred_state, mode, index, code, &gain_code);
}
else
{
ec_gain_code (st->ec_gain_c_st, st->pred_state, st->state,
&gain_code);
}
ec_gain_code_update (st->ec_gain_c_st, bfi, st->prev_bf,
&gain_code);
pit_sharp = gain_pit;