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.
10 /* Added by Erik de Castro Lopo */
16 #error "This code is not designed to be compiled with a C++ compiler."
18 /* Added by Erik de Castro Lopo */
22 typedef short word; /* 16 bit signed int */
23 typedef int longword; /* 32 bit signed int */
25 typedef unsigned short uword; /* unsigned word */
26 typedef unsigned int ulongword; /* unsigned longword */
31 word z1; /* preprocessing.c, Offset_com. */
32 longword L_z2; /* Offset_com. */
33 int mp; /* Preemphasis */
35 word u[8] ; /* short_term_aly_filter.c */
36 word LARpp[2][8] ; /* */
39 word ltp_cut; /* long_term.c, LTP crosscorr. */
40 word nrp; /* 40 */ /* long_term.c, synthesis */
41 word v[9] ; /* short_term.c, synthesis */
42 word msr; /* decoder.c, Postprocessing */
44 char verbose; /* only used if !NDEBUG */
45 char fast; /* only used if FAST */
47 char wav_fmt; /* only used if WAV49 defined */
48 unsigned char frame_index; /* odd/even chaining */
49 unsigned char frame_chain; /* half-byte to carry forward */
51 /* Moved here from code.c where it was defined as static */
55 typedef struct gsm_state GSM_STATE ;
57 #define MIN_WORD (-32767 - 1)
58 #define MAX_WORD 32767
60 #define MIN_LONGWORD (-2147483647 - 1)
61 #define MAX_LONGWORD 2147483647
63 /* Signed arithmetic shift right. */
65 SASR_W (word x, word by)
69 static inline longword
70 SASR_L (longword x, word by)
75 * Prototypes from add.c
77 word gsm_mult (word a, word b) ;
78 longword gsm_L_mult (word a, word b) ;
79 word gsm_mult_r (word a, word b) ;
81 word gsm_div (word num, word denum) ;
83 word gsm_add (word a, word b ) ;
84 longword gsm_L_add (longword a, longword b ) ;
86 word gsm_sub (word a, word b) ;
87 longword gsm_L_sub (longword a, longword b) ;
89 word gsm_abs (word a) ;
91 word gsm_norm (longword a ) ;
93 longword gsm_L_asl (longword a, int n) ;
94 word gsm_asl (word a, int n) ;
96 longword gsm_L_asr (longword a, int n) ;
97 word gsm_asr (word a, int n) ;
100 * Inlined functions from add.h
103 static inline longword
104 GSM_MULT_R (word a, word b)
105 { return (((longword) (a)) * ((longword) (b)) + 16384) >> 15 ;
108 static inline longword
109 GSM_MULT (word a, word b)
110 { return (((longword) (a)) * ((longword) (b))) >> 15 ;
113 static inline longword
114 GSM_L_MULT (word a, word b)
115 { return ((longword) (a)) * ((longword) (b)) << 1 ;
118 static inline longword
119 GSM_L_ADD (longword a, longword b)
123 { utmp = (ulongword)-((a) + 1) + (ulongword)-((b) + 1) ;
124 return (utmp >= (ulongword) MAX_LONGWORD) ? MIN_LONGWORD : -(longword)utmp-2 ;
128 { utmp = (ulongword) a + (ulongword) b ;
129 return (utmp >= (ulongword) MAX_LONGWORD) ? MAX_LONGWORD : utmp ;
135 static inline longword
136 GSM_ADD (word a, word b)
139 ltmp = ((longword) a) + ((longword) b) ;
141 if (ltmp >= MAX_WORD)
143 if (ltmp <= MIN_WORD)
149 static inline longword
150 GSM_SUB (word a, word b)
153 ltmp = ((longword) a) - ((longword) b) ;
155 if (ltmp >= MAX_WORD)
157 else if (ltmp <= MIN_WORD)
175 * More prototypes from implementations..
178 struct gsm_state * S,
179 word * s, /* [0..159] samples IN */
180 word * LARc, /* [0..7] LAR coefficients OUT */
181 word * Nc, /* [0..3] LTP lag OUT */
182 word * bc, /* [0..3] coded LTP gain OUT */
183 word * Mc, /* [0..3] RPE grid selection OUT */
184 word * xmaxc,/* [0..3] Coded maximum amplitude OUT */
185 word * xMc) ;/* [13*4] normalized RPE samples OUT */
187 void Gsm_Long_Term_Predictor ( /* 4x for 160 samples */
188 struct gsm_state * S,
189 word * d, /* [0..39] residual signal IN */
190 word * dp, /* [-120..-1] d' IN */
191 word * e, /* [0..40] OUT */
192 word * dpp, /* [0..40] OUT */
193 word * Nc, /* correlation lag OUT */
194 word * bc) ; /* gain factor OUT */
196 void Gsm_LPC_Analysis (
197 struct gsm_state * S,
198 word * s, /* 0..159 signals IN/OUT */
199 word * LARc) ; /* 0..7 LARc's OUT */
201 void Gsm_Preprocess (
202 struct gsm_state * S,
203 word * s, word * so) ;
206 struct gsm_state * S,
213 void Gsm_Short_Term_Analysis_Filter (
214 struct gsm_state * S,
215 word * LARc, /* coded log area ratio [0..7] IN */
216 word * d) ; /* st res. signal [0..159] IN/OUT */
219 struct gsm_state * S,
220 word * LARcr, /* [0..7] IN */
221 word * Ncr, /* [0..3] IN */
222 word * bcr, /* [0..3] IN */
223 word * Mcr, /* [0..3] IN */
224 word * xmaxcr, /* [0..3] IN */
225 word * xMcr, /* [0..13*4] IN */
226 word * s) ; /* [0..159] OUT */
229 struct gsm_state * S,
232 word * xMcr, /* [0..12] IN */
233 word * erp) ; /* [0..39] OUT */
235 void Gsm_Long_Term_Synthesis_Filtering (
239 word * erp, /* [0..39] IN */
240 word * drp) ; /* [-120..-1] IN, [0..40] OUT */
242 void Gsm_RPE_Decoding (
243 /*-struct gsm_state *S,-*/
246 word * xMcr, /* [0..12], 3 bits IN */
247 word * erp) ; /* [0..39] OUT */
249 void Gsm_RPE_Encoding (
250 /*-struct gsm_state * S,-*/
251 word * e, /* -5..-1][0..39][40..44 IN/OUT */
252 word * xmaxc, /* OUT */
254 word * xMc) ; /* [0..12] OUT */
256 void Gsm_Short_Term_Synthesis_Filter (
257 struct gsm_state * S,
258 word * LARcr, /* log area ratios [0..7] IN */
259 word * drp, /* received d [0...39] IN */
260 word * s) ; /* signal s [0..159] OUT */
262 void Gsm_Update_of_reconstructed_short_time_residual_signal (
263 word * dpp, /* [0...39] IN */
264 word * ep, /* [0...39] IN */
265 word * dp) ; /* [-120...-1] IN/OUT */
268 * Tables from table.c
272 extern word gsm_A [8], gsm_B [8], gsm_MIC [8], gsm_MAC [8] ;
273 extern word gsm_INVA [8] ;
274 extern word gsm_DLB [4], gsm_QLB [4] ;
275 extern word gsm_H [11] ;
276 extern word gsm_NRFAC [8] ;
277 extern word gsm_FAC [8] ;
279 #endif /* GSM_TABLE_C */
286 # define gsm_debug_words(a, b, c, d) /* nil */
287 # define gsm_debug_longwords(a, b, c, d) /* nil */
288 # define gsm_debug_word(a, b) /* nil */
289 # define gsm_debug_longword(a, b) /* nil */
291 #else /* !NDEBUG => DEBUG */
293 void gsm_debug_words (char * name, int, int, word *) ;
294 void gsm_debug_longwords (char * name, int, int, longword *) ;
295 void gsm_debug_longword (char * name, longword) ;
296 void gsm_debug_word (char * name, word) ;
300 #endif /* PRIVATE_H */
302 ** Do not edit or modify anything in this comment block.
303 ** The arch-tag line is a file identity tag for the GNU Arch
304 ** revision control system.
306 ** arch-tag: 8bc5fdf2-e8c8-4686-9bd7-a30b512bef0c