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1/*
2
3 This program is part of the TACLeBench benchmark suite.
4 Version V 2.0
5
6 Name: gsm_dec
7
8 Author: Jutta Degener and Carsten Bormann,
9 Technische Universitaet Berlin
10
11 Function: Decoding of GSM data
12
13 Source: included in MediaBench/gsm
14
15 Original name: gsm_decode
16
17 Changes: no major functional changes
18
19 License: see the accompanying COPYRIGHT file
20
21*/
22
23
24#include "extra.h"
25#include "gsm.h"
26#include "add.h"
27#include "data.h"
28#include "private.h"
29
30#define SAMPLES 20
31
32/*
33 Forward declaration of global variables
34*/
35
36struct gsm_state gsm_dec_state;
37gsm gsm_dec_state_ptr;
38volatile int gsm_dec_result;
39
40/*
41 Forward declaration of functions
42*/
43
44extern word gsm_dec_sub( word a, word b );
45extern word gsm_dec_asl( word a, int n );
46void gsm_dec_Decoding_of_the_coded_Log_Area_Ratios(
47 word *LARc, /* coded log area ratio [0..7] IN */
48 word *LARpp ); /* out: decoded .. */
49
50void gsm_dec_Coefficients_0_12( word *LARpp_j_1, word *LARpp_j, word *LARp );
51
52void gsm_dec_LARp_to_rp( word *LARp ); /* [0..7] IN/OUT */
53
54extern int gsm_dec_decode( gsm, gsm_byte *, gsm_signal * );
55
56extern void gsm_dec_Decoder( struct gsm_state *S,
57 word *LARcr, /* [0..7] IN */
58 word *Ncr, /* [0..3] IN */
59 word *bcr, /* [0..3] IN */
60 word *Mcr, /* [0..3] IN */
61 word *xmaxcr, /* [0..3] IN */
62 word *xMcr, /* [0..13*4] IN */
63 word *s ); /* [0..159] OUT */
64
65extern void gsm_dec_Long_Term_Synthesis_Filtering(
66 struct gsm_state *S, word Ncr, word bcr,
67 word *erp, /* [0..39] IN */
68 word *drp ); /* [-120..-1] IN, [0..40] OUT */
69
70void gsm_dec_RPE_Decoding( word xmaxcr, word Mcr,
71 word *xMcr, /* [0..12], 3 bits IN */
72 word *erp ); /* [0..39] OUT */
73
74void gsm_dec_RPE_grid_positioning( word Mc, /* grid position IN */
75 word *xMp, /* [0..12] IN */
76 word *ep /* [0..39] OUT */
77 );
78
79void gsm_dec_APCM_inverse_quantization( word *xMc, /* [0..12] IN */
80 word mant, word exp,
81 word *xMp ); /* [0..12] OUT */
82
83extern word gsm_dec_asr( word a, int n );
84
85void gsm_dec_APCM_quantization_xmaxc_to_exp_mant(
86 word xmaxc, /* IN */
87 word *exp_out, /* OUT */
88 word *mant_out ); /* OUT */
89
90void gsm_dec_Postprocessing( struct gsm_state *S, word *s );
91
92void gsm_dec_Coefficients_13_26( word *LARpp_j_1, word *LARpp_j,
93 word *LARp );
94
95void gsm_dec_Coefficients_40_159( word *LARpp_j, word *LARp );
96
97void gsm_dec_Short_term_synthesis_filtering( struct gsm_state *S,
98 word *rrp, /* [0..7] IN */
99 int k, /* k_end - k_start */
100 word *wt, /* [0..k-1] IN */
101 word *sr /* [0..k-1] OUT */
102 );
103
104void gsm_dec_Short_Term_Synthesis_Filter(
105 struct gsm_state *S, word *LARcr, /* received log area ratios [0..7] IN */
106 word *wt, /* received d [0..159] IN */
107 word *s /* signal s [0..159] OUT */
108);
109
110void gsm_dec_Coefficients_27_39( word *LARpp_j_1, word *LARpp_j, word *LARp );
111
112gsm gsm_dec_create( void );
113void gsm_dec_init( void );
114void gsm_dec_main( void );
115//int main( void );
116
117/* add.c */
118
119word gsm_dec_sub( word a, word b )
120{
121 longword diff = ( longword )a - ( longword )b;
122 return saturate( diff );
123}
124
125word gsm_dec_asl( word a, int n )
126{
127 if ( n >= 16 )
128 return 0;
129 if ( n <= -16 )
130 return -( a < 0 );
131 if ( n < 0 )
132 return gsm_dec_asr( a, -n );
133 return a << n;
134}
135
136/* short_term.c */
137/*
138 SHORT TERM ANALYSIS FILTERING SECTION
139*/
140
141/* 4.2.8 */
142
143void gsm_dec_Decoding_of_the_coded_Log_Area_Ratios(
144 word *LARc, /* coded log area ratio [0..7] IN */
145 word *LARpp ) /* out: decoded .. */
146{
147 word temp1 /* for STEP */;
148 long ltmp; /* for GSM_ADD */
149
150 /* This procedure requires for efficient implementation
151 two tables.
152
153 INVA[1..8] = integer( (32768 * 8) / real_A[1..8])
154 MIC[1..8] = minimum value of the LARc[1..8]
155 */
156
157 /* Compute the LARpp[1..8]
158 */
159
160 /* for (i = 1; i <= 8; i++, B++, MIC++, INVA++, LARc++, LARpp++) {
161
162 temp1 = GSM_ADD( *LARc, *MIC ) << 10;
163 temp2 = *B << 1;
164 temp1 = GSM_SUB( temp1, temp2 );
165
166 temp1 = GSM_MULT_R( *INVA, temp1 );
167 LARpp = GSM_ADD( temp1, temp1 );
168 }
169 */
170
171#undef STEP
172#define STEP(B, MIC, INVA) \
173 temp1 = GSM_ADD(*LARc++, MIC) << 10; \
174 temp1 = GSM_SUB(temp1, B << 1); \
175 temp1 = GSM_MULT_R(INVA, temp1); \
176 *LARpp++ = GSM_ADD(temp1, temp1);
177
178 STEP( 0, -32, 13107 );
179 STEP( 0, -32, 13107 );
180 STEP( 2048, -16, 13107 );
181 STEP( 2560, -16, 13107 );
182
183 STEP( 94, -8, 19223 );
184 STEP( 1792, -8, 17476 );
185 STEP( 341, -4, 31454 );
186 STEP( 1144, -4, 29708 );
187
188 /* NOTE: the addition of *MIC is used to restore the sign of *LARc.
189 */
190}
191
192/* 4.2.9 */
193/* Computation of the quantized reflection coefficients
194*/
195
196/* 4.2.9.1 Interpolation of the LARpp[1..8] to get the LARp[1..8]
197*/
198
199/*
200 Within each frame of 160 analyzed speech samples the short term
201 analysis and synthesis filters operate with four different sets of
202 coefficients, derived from the previous set of decoded LARs(LARpp(j-1))
203 and the actual set of decoded LARs (LARpp(j))
204
205 (Initial value: LARpp(j-1)[1..8] = 0.)
206*/