2 * Copyright 1992 by Jutta Degener and Carsten Bormann, Technische
3 * Universitaet Berlin. See the accompanying file "COPYRIGHT" for
4 * details. THERE IS ABSOLUTELY NO WARRANTY FOR THIS SOFTWARE.
12 typedef short word; /* 16 bit signed int */
13 typedef long longword; /* 32 bit signed int */
15 typedef unsigned short uword; /* unsigned word */
16 typedef unsigned long ulongword; /* unsigned longword */
22 word z1; /* preprocessing.c, Offset_com. */
23 longword L_z2; /* Offset_com. */
24 int mp; /* Preemphasis */
26 word u[8]; /* short_term_aly_filter.c */
27 word LARpp[2][8]; /* */
30 word ltp_cut; /* long_term.c, LTP crosscorr. */
31 word nrp; /* 40 */ /* long_term.c, synthesis */
32 word v[9]; /* short_term.c, synthesis */
33 word msr; /* decoder.c, Postprocessing */
35 char verbose; /* only used if !NDEBUG */
36 char fast; /* only used if FAST */
38 char wav_fmt; /* only used if WAV49 defined */
39 unsigned char frame_index; /* odd/even chaining */
40 unsigned char frame_chain; /* half-byte to carry forward */
44 #define MIN_WORD (-32767 - 1)
45 #define MAX_WORD 32767
47 #define MIN_LONGWORD (-2147483647 - 1)
48 #define MAX_LONGWORD 2147483647
50 #ifdef SASR /* flag: >> is a signed arithmetic shift right */
52 #define SASR(x, by) ((x) >> (by))
54 #define SASR(x, by) ((x) >= 0 ? (x) >> (by) : (~(-((x) + 1) >> (by))))
60 * Prototypes from add.c
62 extern word gsm_mult P((word a, word b));
63 extern longword gsm_L_mult P((word a, word b));
64 extern word gsm_mult_r P((word a, word b));
66 extern word gsm_div P((word num, word denum));
68 extern word gsm_add P(( word a, word b ));
69 extern longword gsm_L_add P(( longword a, longword b ));
71 extern word gsm_sub P((word a, word b));
72 extern longword gsm_L_sub P((longword a, longword b));
74 extern word gsm_abs P((word a));
76 extern word gsm_norm P(( longword a ));
78 extern longword gsm_L_asl P((longword a, int n));
79 extern word gsm_asl P((word a, int n));
81 extern longword gsm_L_asr P((longword a, int n));
82 extern word gsm_asr P((word a, int n));
85 * Inlined functions from add.h
89 * #define GSM_MULT_R(a, b) (* word a, word b, !(a == b == MIN_WORD) *) \
90 * (0x0FFFF & SASR(((longword)(a) * (longword)(b) + 16384), 15))
92 #define GSM_MULT_R(a, b) /* word a, word b, !(a == b == MIN_WORD) */ \
93 (SASR( ((longword)(a) * (longword)(b) + 16384), 15 ))
95 # define GSM_MULT(a,b) /* word a, word b, !(a == b == MIN_WORD) */ \
96 (SASR( ((longword)(a) * (longword)(b)), 15 ))
98 # define GSM_L_MULT(a, b) /* word a, word b */ \
99 (((longword)(a) * (longword)(b)) << 1)
101 # define GSM_L_ADD(a, b) \
102 ( (a) < 0 ? ( (b) >= 0 ? (a) + (b) \
103 : (utmp = (ulongword)-((a) + 1) + (ulongword)-((b) + 1)) \
104 >= MAX_LONGWORD ? MIN_LONGWORD : -(longword)utmp-2 ) \
105 : ((b) <= 0 ? (a) + (b) \
106 : (utmp = (ulongword)(a) + (ulongword)(b)) >= MAX_LONGWORD \
107 ? MAX_LONGWORD : utmp))
110 * # define GSM_ADD(a, b) \
111 * ((ltmp = (longword)(a) + (longword)(b)) >= MAX_WORD \
112 * ? MAX_WORD : ltmp <= MIN_WORD ? MIN_WORD : ltmp)
114 /* Nonportable, but faster: */
116 #define GSM_ADD(a, b) \
117 ((ulongword)((ltmp = (longword)(a) + (longword)(b)) - MIN_WORD) > \
118 MAX_WORD - MIN_WORD ? (ltmp > 0 ? MAX_WORD : MIN_WORD) : ltmp)
120 # define GSM_SUB(a, b) \
121 ((ltmp = (longword)(a) - (longword)(b)) >= MAX_WORD \
122 ? MAX_WORD : ltmp <= MIN_WORD ? MIN_WORD : ltmp)
124 # define GSM_ABS(a) ((a) < 0 ? ((a) == MIN_WORD ? MAX_WORD : -(a)) : (a))
126 /* Use these if necessary:
128 # define GSM_MULT_R(a, b) gsm_mult_r(a, b)
129 # define GSM_MULT(a, b) gsm_mult(a, b)
130 # define GSM_L_MULT(a, b) gsm_L_mult(a, b)
132 # define GSM_L_ADD(a, b) gsm_L_add(a, b)
133 # define GSM_ADD(a, b) gsm_add(a, b)
134 # define GSM_SUB(a, b) gsm_sub(a, b)
136 # define GSM_ABS(a) gsm_abs(a)
141 * More prototypes from implementations..
143 extern void Gsm_Coder P((
144 struct gsm_state * S,
145 word * s, /* [0..159] samples IN */
146 word * LARc, /* [0..7] LAR coefficients OUT */
147 word * Nc, /* [0..3] LTP lag OUT */
148 word * bc, /* [0..3] coded LTP gain OUT */
149 word * Mc, /* [0..3] RPE grid selection OUT */
150 word * xmaxc,/* [0..3] Coded maximum amplitude OUT */
151 word * xMc /* [13*4] normalized RPE samples OUT */));
153 extern void Gsm_Long_Term_Predictor P(( /* 4x for 160 samples */
154 struct gsm_state * S,
155 word * d, /* [0..39] residual signal IN */
156 word * dp, /* [-120..-1] d' IN */
157 word * e, /* [0..40] OUT */
158 word * dpp, /* [0..40] OUT */
159 word * Nc, /* correlation lag OUT */
160 word * bc /* gain factor OUT */));
162 extern void Gsm_LPC_Analysis P((
163 struct gsm_state * S,
164 word * s, /* 0..159 signals IN/OUT */
165 word * LARc)); /* 0..7 LARc's OUT */
167 extern void Gsm_Preprocess P((
168 struct gsm_state * S,
169 word * s, word * so));
171 extern void Gsm_Encoding P((
172 struct gsm_state * S,
179 extern void Gsm_Short_Term_Analysis_Filter P((
180 struct gsm_state * S,
181 word * LARc, /* coded log area ratio [0..7] IN */
182 word * d /* st res. signal [0..159] IN/OUT */));
184 extern void Gsm_Decoder P((
185 struct gsm_state * S,
186 word * LARcr, /* [0..7] IN */
187 word * Ncr, /* [0..3] IN */
188 word * bcr, /* [0..3] IN */
189 word * Mcr, /* [0..3] IN */
190 word * xmaxcr, /* [0..3] IN */
191 word * xMcr, /* [0..13*4] IN */
192 word * s)); /* [0..159] OUT */
194 extern void Gsm_Decoding P((
195 struct gsm_state * S,
198 word * xMcr, /* [0..12] IN */
199 word * erp)); /* [0..39] OUT */
201 extern void Gsm_Long_Term_Synthesis_Filtering P((
205 word * erp, /* [0..39] IN */
206 word * drp)); /* [-120..-1] IN, [0..40] OUT */
208 void Gsm_RPE_Decoding P((
212 word * xMcr, /* [0..12], 3 bits IN */
213 word * erp)); /* [0..39] OUT */
215 void Gsm_RPE_Encoding P((
216 struct gsm_state * S,
217 word * e, /* -5..-1][0..39][40..44 IN/OUT */
218 word * xmaxc, /* OUT */
220 word * xMc)); /* [0..12] OUT */
222 extern void Gsm_Short_Term_Synthesis_Filter P((
223 struct gsm_state * S,
224 word * LARcr, /* log area ratios [0..7] IN */
225 word * drp, /* received d [0...39] IN */
226 word * s)); /* signal s [0..159] OUT */
228 extern void Gsm_Update_of_reconstructed_short_time_residual_signal P((
229 word * dpp, /* [0...39] IN */
230 word * ep, /* [0...39] IN */
231 word * dp)); /* [-120...-1] IN/OUT */
234 * Tables from table.c
238 extern word gsm_A[8], gsm_B[8], gsm_MIC[8], gsm_MAC[8];
239 extern word gsm_INVA[8];
240 extern word gsm_DLB[4], gsm_QLB[4];
241 extern word gsm_H[11];
242 extern word gsm_NRFAC[8];
243 extern word gsm_FAC[8];
245 #endif /* GSM_TABLE_C */
252 # define gsm_debug_words(a, b, c, d) /* nil */
253 # define gsm_debug_longwords(a, b, c, d) /* nil */
254 # define gsm_debug_word(a, b) /* nil */
255 # define gsm_debug_longword(a, b) /* nil */
257 #else /* !NDEBUG => DEBUG */
259 extern void gsm_debug_words P((char * name, int, int, word *));
260 extern void gsm_debug_longwords P((char * name, int, int, longword *));
261 extern void gsm_debug_longword P((char * name, longword));
262 extern void gsm_debug_word P((char * name, word));
268 #endif /* PRIVATE_H */