1 /* 2 * Copyright (c) 2011 The WebRTC project authors. All Rights Reserved. 3 * 4 * Use of this source code is governed by a BSD-style license 5 * that can be found in the LICENSE file in the root of the source 6 * tree. An additional intellectual property rights grant can be found 7 * in the file PATENTS. All contributing project authors may 8 * be found in the AUTHORS file in the root of the source tree. 9 */ 10 11 12 /* 13 * This header file includes all of the fix point signal processing library (SPL) function 14 * descriptions and declarations. 15 * For specific function calls, see bottom of file. 16 */ 17 18 #ifndef WEBRTC_SPL_SIGNAL_PROCESSING_LIBRARY_H_ 19 #define WEBRTC_SPL_SIGNAL_PROCESSING_LIBRARY_H_ 20 21 #include <string.h> 22 #include "typedefs.h" 23 24 #ifdef ARM_WINM 25 #include <Armintr.h> // intrinsic file for windows mobile 26 #endif 27 28 #ifdef WEBRTC_ANDROID 29 #define WEBRTC_SPL_INLINE_CALLS 30 #define SPL_NO_DOUBLE_IMPLEMENTATIONS 31 #endif 32 33 // Macros specific for the fixed point implementation 34 #define WEBRTC_SPL_WORD16_MAX 32767 35 #define WEBRTC_SPL_WORD16_MIN -32768 36 #define WEBRTC_SPL_WORD32_MAX (WebRtc_Word32)0x7fffffff 37 #define WEBRTC_SPL_WORD32_MIN (WebRtc_Word32)0x80000000 38 #define WEBRTC_SPL_MAX_LPC_ORDER 14 39 #define WEBRTC_SPL_MAX_SEED_USED 0x80000000L 40 #define WEBRTC_SPL_MIN(A, B) (A < B ? A : B) // Get min value 41 #define WEBRTC_SPL_MAX(A, B) (A > B ? A : B) // Get max value 42 #define WEBRTC_SPL_ABS_W16(a)\ 43 (((WebRtc_Word16)a >= 0) ? ((WebRtc_Word16)a) : -((WebRtc_Word16)a)) 44 #define WEBRTC_SPL_ABS_W32(a)\ 45 (((WebRtc_Word32)a >= 0) ? ((WebRtc_Word32)a) : -((WebRtc_Word32)a)) 46 47 #if (defined WEBRTC_TARGET_PC)||(defined __TARGET_XSCALE) 48 #define WEBRTC_SPL_GET_BYTE(a, nr) (((WebRtc_Word8 *)a)[nr]) 49 #define WEBRTC_SPL_SET_BYTE(d_ptr, val, index) \ 50 (((WebRtc_Word8 *)d_ptr)[index] = (val)) 51 #elif defined WEBRTC_BIG_ENDIAN 52 #define WEBRTC_SPL_GET_BYTE(a, nr)\ 53 ((((WebRtc_Word16 *)a)[nr >> 1]) >> (((nr + 1) & 0x1) * 8) & 0x00ff) 54 #define WEBRTC_SPL_SET_BYTE(d_ptr, val, index) \ 55 ((WebRtc_Word16 *)d_ptr)[index >> 1] = \ 56 ((((WebRtc_Word16 *)d_ptr)[index >> 1]) \ 57 & (0x00ff << (8 * ((index) & 0x1)))) | (val << (8 * ((index + 1) & 0x1))) 58 #else 59 #define WEBRTC_SPL_GET_BYTE(a,nr) \ 60 ((((WebRtc_Word16 *)(a))[(nr) >> 1]) >> (((nr) & 0x1) * 8) & 0x00ff) 61 #define WEBRTC_SPL_SET_BYTE(d_ptr, val, index) \ 62 ((WebRtc_Word16 *)(d_ptr))[(index) >> 1] = \ 63 ((((WebRtc_Word16 *)(d_ptr))[(index) >> 1]) \ 64 & (0x00ff << (8 * (((index) + 1) & 0x1)))) | \ 65 ((val) << (8 * ((index) & 0x1))) 66 #endif 67 68 #ifndef WEBRTC_ANDROID 69 #define WEBRTC_SPL_MUL(a, b) \ 70 ((WebRtc_Word32) ((WebRtc_Word32)(a) * (WebRtc_Word32)(b))) 71 #endif 72 73 #define WEBRTC_SPL_UMUL(a, b) \ 74 ((WebRtc_UWord32) ((WebRtc_UWord32)(a) * (WebRtc_UWord32)(b))) 75 #define WEBRTC_SPL_UMUL_RSFT16(a, b)\ 76 ((WebRtc_UWord32) ((WebRtc_UWord32)(a) * (WebRtc_UWord32)(b)) >> 16) 77 #define WEBRTC_SPL_UMUL_16_16(a, b)\ 78 ((WebRtc_UWord32) (WebRtc_UWord16)(a) * (WebRtc_UWord16)(b)) 79 #define WEBRTC_SPL_UMUL_16_16_RSFT16(a, b)\ 80 (((WebRtc_UWord32) (WebRtc_UWord16)(a) * (WebRtc_UWord16)(b)) >> 16) 81 #define WEBRTC_SPL_UMUL_32_16(a, b)\ 82 ((WebRtc_UWord32) ((WebRtc_UWord32)(a) * (WebRtc_UWord16)(b))) 83 #define WEBRTC_SPL_UMUL_32_16_RSFT16(a, b)\ 84 ((WebRtc_UWord32) ((WebRtc_UWord32)(a) * (WebRtc_UWord16)(b)) >> 16) 85 #define WEBRTC_SPL_MUL_16_U16(a, b)\ 86 ((WebRtc_Word32)(WebRtc_Word16)(a) * (WebRtc_UWord16)(b)) 87 #define WEBRTC_SPL_DIV(a, b) \ 88 ((WebRtc_Word32) ((WebRtc_Word32)(a) / (WebRtc_Word32)(b))) 89 #define WEBRTC_SPL_UDIV(a, b) \ 90 ((WebRtc_UWord32) ((WebRtc_UWord32)(a) / (WebRtc_UWord32)(b))) 91 92 #define WEBRTC_SPL_MUL_16_32_RSFT11(a, b)\ 93 ((WEBRTC_SPL_MUL_16_16(a, (b) >> 16) << 5) \ 94 + (((WEBRTC_SPL_MUL_16_U16(a, (WebRtc_UWord16)(b)) >> 1) + 0x0200) >> 10)) 95 #define WEBRTC_SPL_MUL_16_32_RSFT14(a, b)\ 96 ((WEBRTC_SPL_MUL_16_16(a, (b) >> 16) << 2) \ 97 + (((WEBRTC_SPL_MUL_16_U16(a, (WebRtc_UWord16)(b)) >> 1) + 0x1000) >> 13)) 98 #define WEBRTC_SPL_MUL_16_32_RSFT15(a, b) \ 99 ((WEBRTC_SPL_MUL_16_16(a, (b) >> 16) << 1) \ 100 + (((WEBRTC_SPL_MUL_16_U16(a, (WebRtc_UWord16)(b)) >> 1) + 0x2000) >> 14)) 101 102 #ifndef WEBRTC_ANDROID 103 #define WEBRTC_SPL_MUL_16_32_RSFT16(a, b) \ 104 (WEBRTC_SPL_MUL_16_16(a, b >> 16) \ 105 + ((WEBRTC_SPL_MUL_16_16(a, (b & 0xffff) >> 1) + 0x4000) >> 15)) 106 #define WEBRTC_SPL_MUL_32_32_RSFT32(a32a, a32b, b32) \ 107 ((WebRtc_Word32)(WEBRTC_SPL_MUL_16_32_RSFT16(a32a, b32) \ 108 + (WEBRTC_SPL_MUL_16_32_RSFT16(a32b, b32) >> 16))) 109 #define WEBRTC_SPL_MUL_32_32_RSFT32BI(a32, b32) \ 110 ((WebRtc_Word32)(WEBRTC_SPL_MUL_16_32_RSFT16(( \ 111 (WebRtc_Word16)(a32 >> 16)), b32) + \ 112 (WEBRTC_SPL_MUL_16_32_RSFT16(( \ 113 (WebRtc_Word16)((a32 & 0x0000FFFF) >> 1)), b32) >> 15))) 114 #endif 115 116 #ifdef ARM_WINM 117 #define WEBRTC_SPL_MUL_16_16(a, b) \ 118 _SmulLo_SW_SL((WebRtc_Word16)(a), (WebRtc_Word16)(b)) 119 #elif !defined (WEBRTC_ANDROID) 120 #define WEBRTC_SPL_MUL_16_16(a, b) \ 121 ((WebRtc_Word32) (((WebRtc_Word16)(a)) * ((WebRtc_Word16)(b)))) 122 #endif 123 124 #define WEBRTC_SPL_MUL_16_16_RSFT(a, b, c) \ 125 (WEBRTC_SPL_MUL_16_16(a, b) >> (c)) 126 127 #define WEBRTC_SPL_MUL_16_16_RSFT_WITH_ROUND(a, b, c) \ 128 ((WEBRTC_SPL_MUL_16_16(a, b) + ((WebRtc_Word32) \ 129 (((WebRtc_Word32)1) << ((c) - 1)))) >> (c)) 130 #define WEBRTC_SPL_MUL_16_16_RSFT_WITH_FIXROUND(a, b)\ 131 ((WEBRTC_SPL_MUL_16_16(a, b) + ((WebRtc_Word32) (1 << 14))) >> 15) 132 133 // C + the 32 most significant bits of A * B 134 #define WEBRTC_SPL_SCALEDIFF32(A, B, C) \ 135 (C + (B >> 16) * A + (((WebRtc_UWord32)(0x0000FFFF & B) * A) >> 16)) 136 137 #define WEBRTC_SPL_ADD_SAT_W32(a, b) WebRtcSpl_AddSatW32(a, b) 138 #define WEBRTC_SPL_SAT(a, b, c) (b > a ? a : b < c ? c : b) 139 #define WEBRTC_SPL_MUL_32_16(a, b) ((a) * (b)) 140 141 #define WEBRTC_SPL_SUB_SAT_W32(a, b) WebRtcSpl_SubSatW32(a, b) 142 #define WEBRTC_SPL_ADD_SAT_W16(a, b) WebRtcSpl_AddSatW16(a, b) 143 #define WEBRTC_SPL_SUB_SAT_W16(a, b) WebRtcSpl_SubSatW16(a, b) 144 145 // We cannot do casting here due to signed/unsigned problem 146 #define WEBRTC_SPL_IS_NEG(a) ((a) & 0x80000000) 147 // Shifting with negative numbers allowed 148 // Positive means left shift 149 #define WEBRTC_SPL_SHIFT_W16(x, c) \ 150 (((c) >= 0) ? ((x) << (c)) : ((x) >> (-(c)))) 151 #define WEBRTC_SPL_SHIFT_W32(x, c) \ 152 (((c) >= 0) ? ((x) << (c)) : ((x) >> (-(c)))) 153 154 // Shifting with negative numbers not allowed 155 // We cannot do casting here due to signed/unsigned problem 156 #define WEBRTC_SPL_RSHIFT_W16(x, c) ((x) >> (c)) 157 #define WEBRTC_SPL_LSHIFT_W16(x, c) ((x) << (c)) 158 #define WEBRTC_SPL_RSHIFT_W32(x, c) ((x) >> (c)) 159 #define WEBRTC_SPL_LSHIFT_W32(x, c) ((x) << (c)) 160 161 #define WEBRTC_SPL_RSHIFT_U16(x, c) ((WebRtc_UWord16)(x) >> (c)) 162 #define WEBRTC_SPL_LSHIFT_U16(x, c) ((WebRtc_UWord16)(x) << (c)) 163 #define WEBRTC_SPL_RSHIFT_U32(x, c) ((WebRtc_UWord32)(x) >> (c)) 164 #define WEBRTC_SPL_LSHIFT_U32(x, c) ((WebRtc_UWord32)(x) << (c)) 165 166 #define WEBRTC_SPL_VNEW(t, n) (t *) malloc (sizeof (t) * (n)) 167 #define WEBRTC_SPL_FREE free 168 169 #define WEBRTC_SPL_RAND(a)\ 170 ((WebRtc_Word16)(WEBRTC_SPL_MUL_16_16_RSFT((a), 18816, 7) & 0x00007fff)) 171 172 #ifdef __cplusplus 173 extern "C" 174 { 175 #endif 176 177 #define WEBRTC_SPL_MEMCPY_W8(v1, v2, length) \ 178 memcpy(v1, v2, (length) * sizeof(char)) 179 #define WEBRTC_SPL_MEMCPY_W16(v1, v2, length) \ 180 memcpy(v1, v2, (length) * sizeof(WebRtc_Word16)) 181 182 #define WEBRTC_SPL_MEMMOVE_W16(v1, v2, length) \ 183 memmove(v1, v2, (length) * sizeof(WebRtc_Word16)) 184 185 // Trigonometric tables used for quick lookup 186 // default declarations 187 extern WebRtc_Word16 WebRtcSpl_kCosTable[]; 188 extern WebRtc_Word16 WebRtcSpl_kSinTable[]; 189 extern WebRtc_Word16 WebRtcSpl_kSinTable1024[]; 190 // Hanning table 191 extern WebRtc_Word16 WebRtcSpl_kHanningTable[]; 192 // Random table 193 extern WebRtc_Word16 WebRtcSpl_kRandNTable[]; 194 195 #ifndef WEBRTC_SPL_INLINE_CALLS 196 WebRtc_Word16 WebRtcSpl_AddSatW16(WebRtc_Word16 var1, WebRtc_Word16 var2); 197 WebRtc_Word16 WebRtcSpl_SubSatW16(WebRtc_Word16 var1, WebRtc_Word16 var2); 198 WebRtc_Word32 WebRtcSpl_AddSatW32(WebRtc_Word32 var1, WebRtc_Word32 var2); 199 WebRtc_Word32 WebRtcSpl_SubSatW32(WebRtc_Word32 var1, WebRtc_Word32 var2); 200 WebRtc_Word16 WebRtcSpl_GetSizeInBits(WebRtc_UWord32 value); 201 int WebRtcSpl_NormW32(WebRtc_Word32 value); 202 int WebRtcSpl_NormW16(WebRtc_Word16 value); 203 int WebRtcSpl_NormU32(WebRtc_UWord32 value); 204 #else 205 #include "spl_inl.h" 206 #endif 207 208 // Get SPL Version 209 WebRtc_Word16 WebRtcSpl_get_version(char* version, 210 WebRtc_Word16 length_in_bytes); 211 212 int WebRtcSpl_GetScalingSquare(WebRtc_Word16* in_vector, 213 int in_vector_length, 214 int times); 215 216 // Copy and set operations. Implementation in copy_set_operations.c. 217 // Descriptions at bottom of file. 218 void WebRtcSpl_MemSetW16(WebRtc_Word16* vector, 219 WebRtc_Word16 set_value, 220 int vector_length); 221 void WebRtcSpl_MemSetW32(WebRtc_Word32* vector, 222 WebRtc_Word32 set_value, 223 int vector_length); 224 void WebRtcSpl_MemCpyReversedOrder(WebRtc_Word16* out_vector, 225 WebRtc_Word16* in_vector, 226 int vector_length); 227 WebRtc_Word16 WebRtcSpl_CopyFromEndW16(G_CONST WebRtc_Word16* in_vector, 228 WebRtc_Word16 in_vector_length, 229 WebRtc_Word16 samples, 230 WebRtc_Word16* out_vector); 231 WebRtc_Word16 WebRtcSpl_ZerosArrayW16(WebRtc_Word16* vector, 232 WebRtc_Word16 vector_length); 233 WebRtc_Word16 WebRtcSpl_ZerosArrayW32(WebRtc_Word32* vector, 234 WebRtc_Word16 vector_length); 235 WebRtc_Word16 WebRtcSpl_OnesArrayW16(WebRtc_Word16* vector, 236 WebRtc_Word16 vector_length); 237 WebRtc_Word16 WebRtcSpl_OnesArrayW32(WebRtc_Word32* vector, 238 WebRtc_Word16 vector_length); 239 // End: Copy and set operations. 240 241 // Minimum and maximum operations. Implementation in min_max_operations.c. 242 // Descriptions at bottom of file. 243 WebRtc_Word16 WebRtcSpl_MaxAbsValueW16(G_CONST WebRtc_Word16* vector, 244 WebRtc_Word16 length); 245 WebRtc_Word32 WebRtcSpl_MaxAbsValueW32(G_CONST WebRtc_Word32* vector, 246 WebRtc_Word16 length); 247 WebRtc_Word16 WebRtcSpl_MinValueW16(G_CONST WebRtc_Word16* vector, 248 WebRtc_Word16 length); 249 WebRtc_Word32 WebRtcSpl_MinValueW32(G_CONST WebRtc_Word32* vector, 250 WebRtc_Word16 length); 251 WebRtc_Word16 WebRtcSpl_MaxValueW16(G_CONST WebRtc_Word16* vector, 252 WebRtc_Word16 length); 253 254 WebRtc_Word16 WebRtcSpl_MaxAbsIndexW16(G_CONST WebRtc_Word16* vector, 255 WebRtc_Word16 length); 256 WebRtc_Word32 WebRtcSpl_MaxValueW32(G_CONST WebRtc_Word32* vector, 257 WebRtc_Word16 length); 258 WebRtc_Word16 WebRtcSpl_MinIndexW16(G_CONST WebRtc_Word16* vector, 259 WebRtc_Word16 length); 260 WebRtc_Word16 WebRtcSpl_MinIndexW32(G_CONST WebRtc_Word32* vector, 261 WebRtc_Word16 length); 262 WebRtc_Word16 WebRtcSpl_MaxIndexW16(G_CONST WebRtc_Word16* vector, 263 WebRtc_Word16 length); 264 WebRtc_Word16 WebRtcSpl_MaxIndexW32(G_CONST WebRtc_Word32* vector, 265 WebRtc_Word16 length); 266 // End: Minimum and maximum operations. 267 268 // Vector scaling operations. Implementation in vector_scaling_operations.c. 269 // Description at bottom of file. 270 void WebRtcSpl_VectorBitShiftW16(WebRtc_Word16* out_vector, 271 WebRtc_Word16 vector_length, 272 G_CONST WebRtc_Word16* in_vector, 273 WebRtc_Word16 right_shifts); 274 void WebRtcSpl_VectorBitShiftW32(WebRtc_Word32* out_vector, 275 WebRtc_Word16 vector_length, 276 G_CONST WebRtc_Word32* in_vector, 277 WebRtc_Word16 right_shifts); 278 void WebRtcSpl_VectorBitShiftW32ToW16(WebRtc_Word16* out_vector, 279 WebRtc_Word16 vector_length, 280 G_CONST WebRtc_Word32* in_vector, 281 WebRtc_Word16 right_shifts); 282 283 void WebRtcSpl_ScaleVector(G_CONST WebRtc_Word16* in_vector, 284 WebRtc_Word16* out_vector, 285 WebRtc_Word16 gain, 286 WebRtc_Word16 vector_length, 287 WebRtc_Word16 right_shifts); 288 void WebRtcSpl_ScaleVectorWithSat(G_CONST WebRtc_Word16* in_vector, 289 WebRtc_Word16* out_vector, 290 WebRtc_Word16 gain, 291 WebRtc_Word16 vector_length, 292 WebRtc_Word16 right_shifts); 293 void WebRtcSpl_ScaleAndAddVectors(G_CONST WebRtc_Word16* in_vector1, 294 WebRtc_Word16 gain1, int right_shifts1, 295 G_CONST WebRtc_Word16* in_vector2, 296 WebRtc_Word16 gain2, int right_shifts2, 297 WebRtc_Word16* out_vector, 298 int vector_length); 299 // End: Vector scaling operations. 300 301 // iLBC specific functions. Implementations in ilbc_specific_functions.c. 302 // Description at bottom of file. 303 void WebRtcSpl_ScaleAndAddVectorsWithRound(WebRtc_Word16* in_vector1, 304 WebRtc_Word16 scale1, 305 WebRtc_Word16* in_vector2, 306 WebRtc_Word16 scale2, 307 WebRtc_Word16 right_shifts, 308 WebRtc_Word16* out_vector, 309 WebRtc_Word16 vector_length); 310 void WebRtcSpl_ReverseOrderMultArrayElements(WebRtc_Word16* out_vector, 311 G_CONST WebRtc_Word16* in_vector, 312 G_CONST WebRtc_Word16* window, 313 WebRtc_Word16 vector_length, 314 WebRtc_Word16 right_shifts); 315 void WebRtcSpl_ElementwiseVectorMult(WebRtc_Word16* out_vector, 316 G_CONST WebRtc_Word16* in_vector, 317 G_CONST WebRtc_Word16* window, 318 WebRtc_Word16 vector_length, 319 WebRtc_Word16 right_shifts); 320 void WebRtcSpl_AddVectorsAndShift(WebRtc_Word16* out_vector, 321 G_CONST WebRtc_Word16* in_vector1, 322 G_CONST WebRtc_Word16* in_vector2, 323 WebRtc_Word16 vector_length, 324 WebRtc_Word16 right_shifts); 325 void WebRtcSpl_AddAffineVectorToVector(WebRtc_Word16* out_vector, 326 WebRtc_Word16* in_vector, 327 WebRtc_Word16 gain, 328 WebRtc_Word32 add_constant, 329 WebRtc_Word16 right_shifts, 330 int vector_length); 331 void WebRtcSpl_AffineTransformVector(WebRtc_Word16* out_vector, 332 WebRtc_Word16* in_vector, 333 WebRtc_Word16 gain, 334 WebRtc_Word32 add_constant, 335 WebRtc_Word16 right_shifts, 336 int vector_length); 337 // End: iLBC specific functions. 338 339 // Signal processing operations. Descriptions at bottom of this file. 340 int WebRtcSpl_AutoCorrelation(G_CONST WebRtc_Word16* vector, 341 int vector_length, int order, 342 WebRtc_Word32* result_vector, 343 int* scale); 344 WebRtc_Word16 WebRtcSpl_LevinsonDurbin(WebRtc_Word32* auto_corr, 345 WebRtc_Word16* lpc_coef, 346 WebRtc_Word16* refl_coef, 347 WebRtc_Word16 order); 348 void WebRtcSpl_ReflCoefToLpc(G_CONST WebRtc_Word16* refl_coef, 349 int use_order, 350 WebRtc_Word16* lpc_coef); 351 void WebRtcSpl_LpcToReflCoef(WebRtc_Word16* lpc_coef, 352 int use_order, 353 WebRtc_Word16* refl_coef); 354 void WebRtcSpl_AutoCorrToReflCoef(G_CONST WebRtc_Word32* auto_corr, 355 int use_order, 356 WebRtc_Word16* refl_coef); 357 void WebRtcSpl_CrossCorrelation(WebRtc_Word32* cross_corr, 358 WebRtc_Word16* vector1, 359 WebRtc_Word16* vector2, 360 WebRtc_Word16 dim_vector, 361 WebRtc_Word16 dim_cross_corr, 362 WebRtc_Word16 right_shifts, 363 WebRtc_Word16 step_vector2); 364 void WebRtcSpl_GetHanningWindow(WebRtc_Word16* window, WebRtc_Word16 size); 365 void WebRtcSpl_SqrtOfOneMinusXSquared(WebRtc_Word16* in_vector, 366 int vector_length, 367 WebRtc_Word16* out_vector); 368 // End: Signal processing operations. 369 370 // Randomization functions. Implementations collected in randomization_functions.c and 371 // descriptions at bottom of this file. 372 WebRtc_UWord32 WebRtcSpl_IncreaseSeed(WebRtc_UWord32* seed); 373 WebRtc_Word16 WebRtcSpl_RandU(WebRtc_UWord32* seed); 374 WebRtc_Word16 WebRtcSpl_RandN(WebRtc_UWord32* seed); 375 WebRtc_Word16 WebRtcSpl_RandUArray(WebRtc_Word16* vector, 376 WebRtc_Word16 vector_length, 377 WebRtc_UWord32* seed); 378 // End: Randomization functions. 379 380 // Math functions 381 WebRtc_Word32 WebRtcSpl_Sqrt(WebRtc_Word32 value); 382 WebRtc_Word32 WebRtcSpl_SqrtFloor(WebRtc_Word32 value); 383 384 // Divisions. Implementations collected in division_operations.c and 385 // descriptions at bottom of this file. 386 WebRtc_UWord32 WebRtcSpl_DivU32U16(WebRtc_UWord32 num, WebRtc_UWord16 den); 387 WebRtc_Word32 WebRtcSpl_DivW32W16(WebRtc_Word32 num, WebRtc_Word16 den); 388 WebRtc_Word16 WebRtcSpl_DivW32W16ResW16(WebRtc_Word32 num, WebRtc_Word16 den); 389 WebRtc_Word32 WebRtcSpl_DivResultInQ31(WebRtc_Word32 num, WebRtc_Word32 den); 390 WebRtc_Word32 WebRtcSpl_DivW32HiLow(WebRtc_Word32 num, WebRtc_Word16 den_hi, 391 WebRtc_Word16 den_low); 392 // End: Divisions. 393 394 WebRtc_Word32 WebRtcSpl_Energy(WebRtc_Word16* vector, 395 int vector_length, 396 int* scale_factor); 397 398 WebRtc_Word32 WebRtcSpl_DotProductWithScale(WebRtc_Word16* vector1, 399 WebRtc_Word16* vector2, 400 int vector_length, 401 int scaling); 402 403 // Filter operations. 404 int WebRtcSpl_FilterAR(G_CONST WebRtc_Word16* ar_coef, int ar_coef_length, 405 G_CONST WebRtc_Word16* in_vector, int in_vector_length, 406 WebRtc_Word16* filter_state, int filter_state_length, 407 WebRtc_Word16* filter_state_low, 408 int filter_state_low_length, WebRtc_Word16* out_vector, 409 WebRtc_Word16* out_vector_low, int out_vector_low_length); 410 411 void WebRtcSpl_FilterMAFastQ12(WebRtc_Word16* in_vector, 412 WebRtc_Word16* out_vector, 413 WebRtc_Word16* ma_coef, 414 WebRtc_Word16 ma_coef_length, 415 WebRtc_Word16 vector_length); 416 void WebRtcSpl_FilterARFastQ12(WebRtc_Word16* in_vector, 417 WebRtc_Word16* out_vector, 418 WebRtc_Word16* ar_coef, 419 WebRtc_Word16 ar_coef_length, 420 WebRtc_Word16 vector_length); 421 int WebRtcSpl_DownsampleFast(WebRtc_Word16* in_vector, 422 WebRtc_Word16 in_vector_length, 423 WebRtc_Word16* out_vector, 424 WebRtc_Word16 out_vector_length, 425 WebRtc_Word16* ma_coef, 426 WebRtc_Word16 ma_coef_length, 427 WebRtc_Word16 factor, 428 WebRtc_Word16 delay); 429 // End: Filter operations. 430 431 // FFT operations 432 int WebRtcSpl_ComplexFFT(WebRtc_Word16 vector[], int stages, int mode); 433 int WebRtcSpl_ComplexIFFT(WebRtc_Word16 vector[], int stages, int mode); 434 #if (defined ARM9E_GCC) || (defined ARM_WINM) || (defined ANDROID_AECOPT) 435 int WebRtcSpl_ComplexFFT2(WebRtc_Word16 in_vector[], 436 WebRtc_Word16 out_vector[], 437 int stages, int mode); 438 int WebRtcSpl_ComplexIFFT2(WebRtc_Word16 in_vector[], 439 WebRtc_Word16 out_vector[], 440 int stages, int mode); 441 #endif 442 void WebRtcSpl_ComplexBitReverse(WebRtc_Word16 vector[], int stages); 443 // End: FFT operations 444 445 /************************************************************ 446 * 447 * RESAMPLING FUNCTIONS AND THEIR STRUCTS ARE DEFINED BELOW 448 * 449 ************************************************************/ 450 451 /******************************************************************* 452 * resample.c 453 * 454 * Includes the following resampling combinations 455 * 22 kHz -> 16 kHz 456 * 16 kHz -> 22 kHz 457 * 22 kHz -> 8 kHz 458 * 8 kHz -> 22 kHz 459 * 460 ******************************************************************/ 461 462 // state structure for 22 -> 16 resampler 463 typedef struct 464 { 465 WebRtc_Word32 S_22_44[8]; 466 WebRtc_Word32 S_44_32[8]; 467 WebRtc_Word32 S_32_16[8]; 468 } WebRtcSpl_State22khzTo16khz; 469 470 void WebRtcSpl_Resample22khzTo16khz(const WebRtc_Word16* in, 471 WebRtc_Word16* out, 472 WebRtcSpl_State22khzTo16khz* state, 473 WebRtc_Word32* tmpmem); 474 475 void WebRtcSpl_ResetResample22khzTo16khz(WebRtcSpl_State22khzTo16khz* state); 476 477 // state structure for 16 -> 22 resampler 478 typedef struct 479 { 480 WebRtc_Word32 S_16_32[8]; 481 WebRtc_Word32 S_32_22[8]; 482 } WebRtcSpl_State16khzTo22khz; 483 484 void WebRtcSpl_Resample16khzTo22khz(const WebRtc_Word16* in, 485 WebRtc_Word16* out, 486 WebRtcSpl_State16khzTo22khz* state, 487 WebRtc_Word32* tmpmem); 488 489 void WebRtcSpl_ResetResample16khzTo22khz(WebRtcSpl_State16khzTo22khz* state); 490 491 // state structure for 22 -> 8 resampler 492 typedef struct 493 { 494 WebRtc_Word32 S_22_22[16]; 495 WebRtc_Word32 S_22_16[8]; 496 WebRtc_Word32 S_16_8[8]; 497 } WebRtcSpl_State22khzTo8khz; 498 499 void WebRtcSpl_Resample22khzTo8khz(const WebRtc_Word16* in, WebRtc_Word16* out, 500 WebRtcSpl_State22khzTo8khz* state, 501 WebRtc_Word32* tmpmem); 502 503 void WebRtcSpl_ResetResample22khzTo8khz(WebRtcSpl_State22khzTo8khz* state); 504 505 // state structure for 8 -> 22 resampler 506 typedef struct 507 { 508 WebRtc_Word32 S_8_16[8]; 509 WebRtc_Word32 S_16_11[8]; 510 WebRtc_Word32 S_11_22[8]; 511 } WebRtcSpl_State8khzTo22khz; 512 513 void WebRtcSpl_Resample8khzTo22khz(const WebRtc_Word16* in, WebRtc_Word16* out, 514 WebRtcSpl_State8khzTo22khz* state, 515 WebRtc_Word32* tmpmem); 516 517 void WebRtcSpl_ResetResample8khzTo22khz(WebRtcSpl_State8khzTo22khz* state); 518 519 /******************************************************************* 520 * resample_fractional.c 521 * Functions for internal use in the other resample functions 522 * 523 * Includes the following resampling combinations 524 * 48 kHz -> 32 kHz 525 * 32 kHz -> 24 kHz 526 * 44 kHz -> 32 kHz 527 * 528 ******************************************************************/ 529 530 void WebRtcSpl_Resample48khzTo32khz(const WebRtc_Word32* In, WebRtc_Word32* Out, 531 const WebRtc_Word32 K); 532 533 void WebRtcSpl_Resample32khzTo24khz(const WebRtc_Word32* In, WebRtc_Word32* Out, 534 const WebRtc_Word32 K); 535 536 void WebRtcSpl_Resample44khzTo32khz(const WebRtc_Word32* In, WebRtc_Word32* Out, 537 const WebRtc_Word32 K); 538 539 /******************************************************************* 540 * resample_48khz.c 541 * 542 * Includes the following resampling combinations 543 * 48 kHz -> 16 kHz 544 * 16 kHz -> 48 kHz 545 * 48 kHz -> 8 kHz 546 * 8 kHz -> 48 kHz 547 * 548 ******************************************************************/ 549 550 typedef struct 551 { 552 WebRtc_Word32 S_48_48[16]; 553 WebRtc_Word32 S_48_32[8]; 554 WebRtc_Word32 S_32_16[8]; 555 } WebRtcSpl_State48khzTo16khz; 556 557 void WebRtcSpl_Resample48khzTo16khz(const WebRtc_Word16* in, WebRtc_Word16* out, 558 WebRtcSpl_State48khzTo16khz* state, 559 WebRtc_Word32* tmpmem); 560 561 void WebRtcSpl_ResetResample48khzTo16khz(WebRtcSpl_State48khzTo16khz* state); 562 563 typedef struct 564 { 565 WebRtc_Word32 S_16_32[8]; 566 WebRtc_Word32 S_32_24[8]; 567 WebRtc_Word32 S_24_48[8]; 568 } WebRtcSpl_State16khzTo48khz; 569 570 void WebRtcSpl_Resample16khzTo48khz(const WebRtc_Word16* in, WebRtc_Word16* out, 571 WebRtcSpl_State16khzTo48khz* state, 572 WebRtc_Word32* tmpmem); 573 574 void WebRtcSpl_ResetResample16khzTo48khz(WebRtcSpl_State16khzTo48khz* state); 575 576 typedef struct 577 { 578 WebRtc_Word32 S_48_24[8]; 579 WebRtc_Word32 S_24_24[16]; 580 WebRtc_Word32 S_24_16[8]; 581 WebRtc_Word32 S_16_8[8]; 582 } WebRtcSpl_State48khzTo8khz; 583 584 void WebRtcSpl_Resample48khzTo8khz(const WebRtc_Word16* in, WebRtc_Word16* out, 585 WebRtcSpl_State48khzTo8khz* state, 586 WebRtc_Word32* tmpmem); 587 588 void WebRtcSpl_ResetResample48khzTo8khz(WebRtcSpl_State48khzTo8khz* state); 589 590 typedef struct 591 { 592 WebRtc_Word32 S_8_16[8]; 593 WebRtc_Word32 S_16_12[8]; 594 WebRtc_Word32 S_12_24[8]; 595 WebRtc_Word32 S_24_48[8]; 596 } WebRtcSpl_State8khzTo48khz; 597 598 void WebRtcSpl_Resample8khzTo48khz(const WebRtc_Word16* in, WebRtc_Word16* out, 599 WebRtcSpl_State8khzTo48khz* state, 600 WebRtc_Word32* tmpmem); 601 602 void WebRtcSpl_ResetResample8khzTo48khz(WebRtcSpl_State8khzTo48khz* state); 603 604 /******************************************************************* 605 * resample_by_2.c 606 * 607 * Includes down and up sampling by a factor of two. 608 * 609 ******************************************************************/ 610 611 void WebRtcSpl_DownsampleBy2(const WebRtc_Word16* in, const WebRtc_Word16 len, 612 WebRtc_Word16* out, WebRtc_Word32* filtState); 613 614 void WebRtcSpl_UpsampleBy2(const WebRtc_Word16* in, WebRtc_Word16 len, WebRtc_Word16* out, 615 WebRtc_Word32* filtState); 616 617 /************************************************************ 618 * END OF RESAMPLING FUNCTIONS 619 ************************************************************/ 620 void WebRtcSpl_AnalysisQMF(const WebRtc_Word16* in_data, 621 WebRtc_Word16* low_band, 622 WebRtc_Word16* high_band, 623 WebRtc_Word32* filter_state1, 624 WebRtc_Word32* filter_state2); 625 void WebRtcSpl_SynthesisQMF(const WebRtc_Word16* low_band, 626 const WebRtc_Word16* high_band, 627 WebRtc_Word16* out_data, 628 WebRtc_Word32* filter_state1, 629 WebRtc_Word32* filter_state2); 630 631 #ifdef __cplusplus 632 } 633 #endif // __cplusplus 634 #endif // WEBRTC_SPL_SIGNAL_PROCESSING_LIBRARY_H_ 635 636 // 637 // WebRtcSpl_AddSatW16(...) 638 // WebRtcSpl_AddSatW32(...) 639 // 640 // Returns the result of a saturated 16-bit, respectively 32-bit, addition of 641 // the numbers specified by the |var1| and |var2| parameters. 642 // 643 // Input: 644 // - var1 : Input variable 1 645 // - var2 : Input variable 2 646 // 647 // Return value : Added and saturated value 648 // 649 650 // 651 // WebRtcSpl_SubSatW16(...) 652 // WebRtcSpl_SubSatW32(...) 653 // 654 // Returns the result of a saturated 16-bit, respectively 32-bit, subtraction 655 // of the numbers specified by the |var1| and |var2| parameters. 656 // 657 // Input: 658 // - var1 : Input variable 1 659 // - var2 : Input variable 2 660 // 661 // Returned value : Subtracted and saturated value 662 // 663 664 // 665 // WebRtcSpl_GetSizeInBits(...) 666 // 667 // Returns the # of bits that are needed at the most to represent the number 668 // specified by the |value| parameter. 669 // 670 // Input: 671 // - value : Input value 672 // 673 // Return value : Number of bits needed to represent |value| 674 // 675 676 // 677 // WebRtcSpl_NormW32(...) 678 // 679 // Norm returns the # of left shifts required to 32-bit normalize the 32-bit 680 // signed number specified by the |value| parameter. 681 // 682 // Input: 683 // - value : Input value 684 // 685 // Return value : Number of bit shifts needed to 32-bit normalize |value| 686 // 687 688 // 689 // WebRtcSpl_NormW16(...) 690 // 691 // Norm returns the # of left shifts required to 16-bit normalize the 16-bit 692 // signed number specified by the |value| parameter. 693 // 694 // Input: 695 // - value : Input value 696 // 697 // Return value : Number of bit shifts needed to 32-bit normalize |value| 698 // 699 700 // 701 // WebRtcSpl_NormU32(...) 702 // 703 // Norm returns the # of left shifts required to 32-bit normalize the unsigned 704 // 32-bit number specified by the |value| parameter. 705 // 706 // Input: 707 // - value : Input value 708 // 709 // Return value : Number of bit shifts needed to 32-bit normalize |value| 710 // 711 712 // 713 // WebRtcSpl_GetScalingSquare(...) 714 // 715 // Returns the # of bits required to scale the samples specified in the 716 // |in_vector| parameter so that, if the squares of the samples are added the 717 // # of times specified by the |times| parameter, the 32-bit addition will not 718 // overflow (result in WebRtc_Word32). 719 // 720 // Input: 721 // - in_vector : Input vector to check scaling on 722 // - in_vector_length : Samples in |in_vector| 723 // - times : Number of additions to be performed 724 // 725 // Return value : Number of right bit shifts needed to avoid 726 // overflow in the addition calculation 727 // 728 729 // 730 // WebRtcSpl_MemSetW16(...) 731 // 732 // Sets all the values in the WebRtc_Word16 vector |vector| of length 733 // |vector_length| to the specified value |set_value| 734 // 735 // Input: 736 // - vector : Pointer to the WebRtc_Word16 vector 737 // - set_value : Value specified 738 // - vector_length : Length of vector 739 // 740 741 // 742 // WebRtcSpl_MemSetW32(...) 743 // 744 // Sets all the values in the WebRtc_Word32 vector |vector| of length 745 // |vector_length| to the specified value |set_value| 746 // 747 // Input: 748 // - vector : Pointer to the WebRtc_Word16 vector 749 // - set_value : Value specified 750 // - vector_length : Length of vector 751 // 752 753 // 754 // WebRtcSpl_MemCpyReversedOrder(...) 755 // 756 // Copies all the values from the source WebRtc_Word16 vector |in_vector| to a 757 // destination WebRtc_Word16 vector |out_vector|. It is done in reversed order, 758 // meaning that the first sample of |in_vector| is copied to the last sample of 759 // the |out_vector|. The procedure continues until the last sample of 760 // |in_vector| has been copied to the first sample of |out_vector|. This 761 // creates a reversed vector. Used in e.g. prediction in iLBC. 762 // 763 // Input: 764 // - in_vector : Pointer to the first sample in a WebRtc_Word16 vector 765 // of length |length| 766 // - vector_length : Number of elements to copy 767 // 768 // Output: 769 // - out_vector : Pointer to the last sample in a WebRtc_Word16 vector 770 // of length |length| 771 // 772 773 // 774 // WebRtcSpl_CopyFromEndW16(...) 775 // 776 // Copies the rightmost |samples| of |in_vector| (of length |in_vector_length|) 777 // to the vector |out_vector|. 778 // 779 // Input: 780 // - in_vector : Input vector 781 // - in_vector_length : Number of samples in |in_vector| 782 // - samples : Number of samples to extract (from right side) 783 // from |in_vector| 784 // 785 // Output: 786 // - out_vector : Vector with the requested samples 787 // 788 // Return value : Number of copied samples in |out_vector| 789 // 790 791 // 792 // WebRtcSpl_ZerosArrayW16(...) 793 // WebRtcSpl_ZerosArrayW32(...) 794 // 795 // Inserts the value "zero" in all positions of a w16 and a w32 vector 796 // respectively. 797 // 798 // Input: 799 // - vector_length : Number of samples in vector 800 // 801 // Output: 802 // - vector : Vector containing all zeros 803 // 804 // Return value : Number of samples in vector 805 // 806 807 // 808 // WebRtcSpl_OnesArrayW16(...) 809 // WebRtcSpl_OnesArrayW32(...) 810 // 811 // Inserts the value "one" in all positions of a w16 and a w32 vector 812 // respectively. 813 // 814 // Input: 815 // - vector_length : Number of samples in vector 816 // 817 // Output: 818 // - vector : Vector containing all ones 819 // 820 // Return value : Number of samples in vector 821 // 822 823 // 824 // WebRtcSpl_MinValueW16(...) 825 // WebRtcSpl_MinValueW32(...) 826 // 827 // Returns the minimum value of a vector 828 // 829 // Input: 830 // - vector : Input vector 831 // - vector_length : Number of samples in vector 832 // 833 // Return value : Minimum sample value in vector 834 // 835 836 // 837 // WebRtcSpl_MaxValueW16(...) 838 // WebRtcSpl_MaxValueW32(...) 839 // 840 // Returns the maximum value of a vector 841 // 842 // Input: 843 // - vector : Input vector 844 // - vector_length : Number of samples in vector 845 // 846 // Return value : Maximum sample value in vector 847 // 848 849 // 850 // WebRtcSpl_MaxAbsValueW16(...) 851 // WebRtcSpl_MaxAbsValueW32(...) 852 // 853 // Returns the largest absolute value of a vector 854 // 855 // Input: 856 // - vector : Input vector 857 // - vector_length : Number of samples in vector 858 // 859 // Return value : Maximum absolute value in vector 860 // 861 862 // 863 // WebRtcSpl_MaxAbsIndexW16(...) 864 // 865 // Returns the vector index to the largest absolute value of a vector 866 // 867 // Input: 868 // - vector : Input vector 869 // - vector_length : Number of samples in vector 870 // 871 // Return value : Index to maximum absolute value in vector 872 // 873 874 // 875 // WebRtcSpl_MinIndexW16(...) 876 // WebRtcSpl_MinIndexW32(...) 877 // 878 // Returns the vector index to the minimum sample value of a vector 879 // 880 // Input: 881 // - vector : Input vector 882 // - vector_length : Number of samples in vector 883 // 884 // Return value : Index to minimum sample value in vector 885 // 886 887 // 888 // WebRtcSpl_MaxIndexW16(...) 889 // WebRtcSpl_MaxIndexW32(...) 890 // 891 // Returns the vector index to the maximum sample value of a vector 892 // 893 // Input: 894 // - vector : Input vector 895 // - vector_length : Number of samples in vector 896 // 897 // Return value : Index to maximum sample value in vector 898 // 899 900 // 901 // WebRtcSpl_VectorBitShiftW16(...) 902 // WebRtcSpl_VectorBitShiftW32(...) 903 // 904 // Bit shifts all the values in a vector up or downwards. Different calls for 905 // WebRtc_Word16 and WebRtc_Word32 vectors respectively. 906 // 907 // Input: 908 // - vector_length : Length of vector 909 // - in_vector : Pointer to the vector that should be bit shifted 910 // - right_shifts : Number of right bit shifts (negative value gives left 911 // shifts) 912 // 913 // Output: 914 // - out_vector : Pointer to the result vector (can be the same as 915 // |in_vector|) 916 // 917 918 // 919 // WebRtcSpl_VectorBitShiftW32ToW16(...) 920 // 921 // Bit shifts all the values in a WebRtc_Word32 vector up or downwards and 922 // stores the result as a WebRtc_Word16 vector 923 // 924 // Input: 925 // - vector_length : Length of vector 926 // - in_vector : Pointer to the vector that should be bit shifted 927 // - right_shifts : Number of right bit shifts (negative value gives left 928 // shifts) 929 // 930 // Output: 931 // - out_vector : Pointer to the result vector (can be the same as 932 // |in_vector|) 933 // 934 935 // 936 // WebRtcSpl_ScaleVector(...) 937 // 938 // Performs the vector operation: 939 // out_vector[k] = (gain*in_vector[k])>>right_shifts 940 // 941 // Input: 942 // - in_vector : Input vector 943 // - gain : Scaling gain 944 // - vector_length : Elements in the |in_vector| 945 // - right_shifts : Number of right bit shifts applied 946 // 947 // Output: 948 // - out_vector : Output vector (can be the same as |in_vector|) 949 // 950 951 // 952 // WebRtcSpl_ScaleVectorWithSat(...) 953 // 954 // Performs the vector operation: 955 // out_vector[k] = SATURATE( (gain*in_vector[k])>>right_shifts ) 956 // 957 // Input: 958 // - in_vector : Input vector 959 // - gain : Scaling gain 960 // - vector_length : Elements in the |in_vector| 961 // - right_shifts : Number of right bit shifts applied 962 // 963 // Output: 964 // - out_vector : Output vector (can be the same as |in_vector|) 965 // 966 967 // 968 // WebRtcSpl_ScaleAndAddVectors(...) 969 // 970 // Performs the vector operation: 971 // out_vector[k] = (gain1*in_vector1[k])>>right_shifts1 972 // + (gain2*in_vector2[k])>>right_shifts2 973 // 974 // Input: 975 // - in_vector1 : Input vector 1 976 // - gain1 : Gain to be used for vector 1 977 // - right_shifts1 : Right bit shift to be used for vector 1 978 // - in_vector2 : Input vector 2 979 // - gain2 : Gain to be used for vector 2 980 // - right_shifts2 : Right bit shift to be used for vector 2 981 // - vector_length : Elements in the input vectors 982 // 983 // Output: 984 // - out_vector : Output vector 985 // 986 987 // 988 // WebRtcSpl_ScaleAndAddVectorsWithRound(...) 989 // 990 // Performs the vector operation: 991 // 992 // out_vector[k] = ((scale1*in_vector1[k]) + (scale2*in_vector2[k]) 993 // + round_value) >> right_shifts 994 // 995 // where: 996 // 997 // round_value = (1<<right_shifts)>>1 998 // 999 // Input: 1000 // - in_vector1 : Input vector 1 1001 // - scale1 : Gain to be used for vector 1 1002 // - in_vector2 : Input vector 2 1003 // - scale2 : Gain to be used for vector 2 1004 // - right_shifts : Number of right bit shifts to be applied 1005 // - vector_length : Number of elements in the input vectors 1006 // 1007 // Output: 1008 // - out_vector : Output vector 1009 // 1010 1011 // 1012 // WebRtcSpl_ReverseOrderMultArrayElements(...) 1013 // 1014 // Performs the vector operation: 1015 // out_vector[n] = (in_vector[n]*window[-n])>>right_shifts 1016 // 1017 // Input: 1018 // - in_vector : Input vector 1019 // - window : Window vector (should be reversed). The pointer 1020 // should be set to the last value in the vector 1021 // - right_shifts : Number of right bit shift to be applied after the 1022 // multiplication 1023 // - vector_length : Number of elements in |in_vector| 1024 // 1025 // Output: 1026 // - out_vector : Output vector (can be same as |in_vector|) 1027 // 1028 1029 // 1030 // WebRtcSpl_ElementwiseVectorMult(...) 1031 // 1032 // Performs the vector operation: 1033 // out_vector[n] = (in_vector[n]*window[n])>>right_shifts 1034 // 1035 // Input: 1036 // - in_vector : Input vector 1037 // - window : Window vector. 1038 // - right_shifts : Number of right bit shift to be applied after the 1039 // multiplication 1040 // - vector_length : Number of elements in |in_vector| 1041 // 1042 // Output: 1043 // - out_vector : Output vector (can be same as |in_vector|) 1044 // 1045 1046 // 1047 // WebRtcSpl_AddVectorsAndShift(...) 1048 // 1049 // Performs the vector operation: 1050 // out_vector[k] = (in_vector1[k] + in_vector2[k])>>right_shifts 1051 // 1052 // Input: 1053 // - in_vector1 : Input vector 1 1054 // - in_vector2 : Input vector 2 1055 // - right_shifts : Number of right bit shift to be applied after the 1056 // multiplication 1057 // - vector_length : Number of elements in |in_vector1| and |in_vector2| 1058 // 1059 // Output: 1060 // - out_vector : Output vector (can be same as |in_vector1|) 1061 // 1062 1063 // 1064 // WebRtcSpl_AddAffineVectorToVector(...) 1065 // 1066 // Adds an affine transformed vector to another vector |out_vector|, i.e, 1067 // performs 1068 // out_vector[k] += (in_vector[k]*gain+add_constant)>>right_shifts 1069 // 1070 // Input: 1071 // - in_vector : Input vector 1072 // - gain : Gain value, used to multiply the in vector with 1073 // - add_constant : Constant value to add (usually 1<<(right_shifts-1), 1074 // but others can be used as well 1075 // - right_shifts : Number of right bit shifts (0-16) 1076 // - vector_length : Number of samples in |in_vector| and |out_vector| 1077 // 1078 // Output: 1079 // - out_vector : Vector with the output 1080 // 1081 1082 // 1083 // WebRtcSpl_AffineTransformVector(...) 1084 // 1085 // Affine transforms a vector, i.e, performs 1086 // out_vector[k] = (in_vector[k]*gain+add_constant)>>right_shifts 1087 // 1088 // Input: 1089 // - in_vector : Input vector 1090 // - gain : Gain value, used to multiply the in vector with 1091 // - add_constant : Constant value to add (usually 1<<(right_shifts-1), 1092 // but others can be used as well 1093 // - right_shifts : Number of right bit shifts (0-16) 1094 // - vector_length : Number of samples in |in_vector| and |out_vector| 1095 // 1096 // Output: 1097 // - out_vector : Vector with the output 1098 // 1099 1100 // 1101 // WebRtcSpl_AutoCorrelation(...) 1102 // 1103 // A 32-bit fix-point implementation of auto-correlation computation 1104 // 1105 // Input: 1106 // - vector : Vector to calculate autocorrelation upon 1107 // - vector_length : Length (in samples) of |vector| 1108 // - order : The order up to which the autocorrelation should be 1109 // calculated 1110 // 1111 // Output: 1112 // - result_vector : auto-correlation values (values should be seen 1113 // relative to each other since the absolute values 1114 // might have been down shifted to avoid overflow) 1115 // 1116 // - scale : The number of left shifts required to obtain the 1117 // auto-correlation in Q0 1118 // 1119 // Return value : Number of samples in |result_vector|, i.e., (order+1) 1120 // 1121 1122 // 1123 // WebRtcSpl_LevinsonDurbin(...) 1124 // 1125 // A 32-bit fix-point implementation of the Levinson-Durbin algorithm that 1126 // does NOT use the 64 bit class 1127 // 1128 // Input: 1129 // - auto_corr : Vector with autocorrelation values of length >= 1130 // |use_order|+1 1131 // - use_order : The LPC filter order (support up to order 20) 1132 // 1133 // Output: 1134 // - lpc_coef : lpc_coef[0..use_order] LPC coefficients in Q12 1135 // - refl_coef : refl_coef[0...use_order-1]| Reflection coefficients in 1136 // Q15 1137 // 1138 // Return value : 1 for stable 0 for unstable 1139 // 1140 1141 // 1142 // WebRtcSpl_ReflCoefToLpc(...) 1143 // 1144 // Converts reflection coefficients |refl_coef| to LPC coefficients |lpc_coef|. 1145 // This version is a 16 bit operation. 1146 // 1147 // NOTE: The 16 bit refl_coef -> lpc_coef conversion might result in a 1148 // "slightly unstable" filter (i.e., a pole just outside the unit circle) in 1149 // "rare" cases even if the reflection coefficients are stable. 1150 // 1151 // Input: 1152 // - refl_coef : Reflection coefficients in Q15 that should be converted 1153 // to LPC coefficients 1154 // - use_order : Number of coefficients in |refl_coef| 1155 // 1156 // Output: 1157 // - lpc_coef : LPC coefficients in Q12 1158 // 1159 1160 // 1161 // WebRtcSpl_LpcToReflCoef(...) 1162 // 1163 // Converts LPC coefficients |lpc_coef| to reflection coefficients |refl_coef|. 1164 // This version is a 16 bit operation. 1165 // The conversion is implemented by the step-down algorithm. 1166 // 1167 // Input: 1168 // - lpc_coef : LPC coefficients in Q12, that should be converted to 1169 // reflection coefficients 1170 // - use_order : Number of coefficients in |lpc_coef| 1171 // 1172 // Output: 1173 // - refl_coef : Reflection coefficients in Q15. 1174 // 1175 1176 // 1177 // WebRtcSpl_AutoCorrToReflCoef(...) 1178 // 1179 // Calculates reflection coefficients (16 bit) from auto-correlation values 1180 // 1181 // Input: 1182 // - auto_corr : Auto-correlation values 1183 // - use_order : Number of coefficients wanted be calculated 1184 // 1185 // Output: 1186 // - refl_coef : Reflection coefficients in Q15. 1187 // 1188 1189 // 1190 // WebRtcSpl_CrossCorrelation(...) 1191 // 1192 // Calculates the cross-correlation between two sequences |vector1| and 1193 // |vector2|. |vector1| is fixed and |vector2| slides as the pointer is 1194 // increased with the amount |step_vector2| 1195 // 1196 // Input: 1197 // - vector1 : First sequence (fixed throughout the correlation) 1198 // - vector2 : Second sequence (slides |step_vector2| for each 1199 // new correlation) 1200 // - dim_vector : Number of samples to use in the cross-correlation 1201 // - dim_cross_corr : Number of cross-correlations to calculate (the 1202 // start position for |vector2| is updated for each 1203 // new one) 1204 // - right_shifts : Number of right bit shifts to use. This will 1205 // become the output Q-domain. 1206 // - step_vector2 : How many (positive or negative) steps the 1207 // |vector2| pointer should be updated for each new 1208 // cross-correlation value. 1209 // 1210 // Output: 1211 // - cross_corr : The cross-correlation in Q(-right_shifts) 1212 // 1213 1214 // 1215 // WebRtcSpl_GetHanningWindow(...) 1216 // 1217 // Creates (the first half of) a Hanning window. Size must be at least 1 and 1218 // at most 512. 1219 // 1220 // Input: 1221 // - size : Length of the requested Hanning window (1 to 512) 1222 // 1223 // Output: 1224 // - window : Hanning vector in Q14. 1225 // 1226 1227 // 1228 // WebRtcSpl_SqrtOfOneMinusXSquared(...) 1229 // 1230 // Calculates y[k] = sqrt(1 - x[k]^2) for each element of the input vector 1231 // |in_vector|. Input and output values are in Q15. 1232 // 1233 // Inputs: 1234 // - in_vector : Values to calculate sqrt(1 - x^2) of 1235 // - vector_length : Length of vector |in_vector| 1236 // 1237 // Output: 1238 // - out_vector : Output values in Q15 1239 // 1240 1241 // 1242 // WebRtcSpl_IncreaseSeed(...) 1243 // 1244 // Increases the seed (and returns the new value) 1245 // 1246 // Input: 1247 // - seed : Seed for random calculation 1248 // 1249 // Output: 1250 // - seed : Updated seed value 1251 // 1252 // Return value : The new seed value 1253 // 1254 1255 // 1256 // WebRtcSpl_RandU(...) 1257 // 1258 // Produces a uniformly distributed value in the WebRtc_Word16 range 1259 // 1260 // Input: 1261 // - seed : Seed for random calculation 1262 // 1263 // Output: 1264 // - seed : Updated seed value 1265 // 1266 // Return value : Uniformly distributed value in the range 1267 // [Word16_MIN...Word16_MAX] 1268 // 1269 1270 // 1271 // WebRtcSpl_RandN(...) 1272 // 1273 // Produces a normal distributed value in the WebRtc_Word16 range 1274 // 1275 // Input: 1276 // - seed : Seed for random calculation 1277 // 1278 // Output: 1279 // - seed : Updated seed value 1280 // 1281 // Return value : N(0,1) value in the Q13 domain 1282 // 1283 1284 // 1285 // WebRtcSpl_RandUArray(...) 1286 // 1287 // Produces a uniformly distributed vector with elements in the WebRtc_Word16 1288 // range 1289 // 1290 // Input: 1291 // - vector_length : Samples wanted in the vector 1292 // - seed : Seed for random calculation 1293 // 1294 // Output: 1295 // - vector : Vector with the uniform values 1296 // - seed : Updated seed value 1297 // 1298 // Return value : Number of samples in vector, i.e., |vector_length| 1299 // 1300 1301 // 1302 // WebRtcSpl_Sqrt(...) 1303 // 1304 // Returns the square root of the input value |value|. The precision of this 1305 // function is integer precision, i.e., sqrt(8) gives 2 as answer. 1306 // If |value| is a negative number then 0 is returned. 1307 // 1308 // Algorithm: 1309 // 1310 // A sixth order Taylor Series expansion is used here to compute the square 1311 // root of a number y^0.5 = (1+x)^0.5 1312 // where 1313 // x = y-1 1314 // = 1+(x/2)-0.5*((x/2)^2+0.5*((x/2)^3-0.625*((x/2)^4+0.875*((x/2)^5) 1315 // 0.5 <= x < 1 1316 // 1317 // Input: 1318 // - value : Value to calculate sqrt of 1319 // 1320 // Return value : Result of the sqrt calculation 1321 // 1322 1323 // 1324 // WebRtcSpl_SqrtFloor(...) 1325 // 1326 // Returns the square root of the input value |value|. The precision of this 1327 // function is rounding down integer precision, i.e., sqrt(8) gives 2 as answer. 1328 // If |value| is a negative number then 0 is returned. 1329 // 1330 // Algorithm: 1331 // 1332 // An iterative 4 cylce/bit routine 1333 // 1334 // Input: 1335 // - value : Value to calculate sqrt of 1336 // 1337 // Return value : Result of the sqrt calculation 1338 // 1339 1340 // 1341 // WebRtcSpl_DivU32U16(...) 1342 // 1343 // Divides a WebRtc_UWord32 |num| by a WebRtc_UWord16 |den|. 1344 // 1345 // If |den|==0, (WebRtc_UWord32)0xFFFFFFFF is returned. 1346 // 1347 // Input: 1348 // - num : Numerator 1349 // - den : Denominator 1350 // 1351 // Return value : Result of the division (as a WebRtc_UWord32), i.e., the 1352 // integer part of num/den. 1353 // 1354 1355 // 1356 // WebRtcSpl_DivW32W16(...) 1357 // 1358 // Divides a WebRtc_Word32 |num| by a WebRtc_Word16 |den|. 1359 // 1360 // If |den|==0, (WebRtc_Word32)0x7FFFFFFF is returned. 1361 // 1362 // Input: 1363 // - num : Numerator 1364 // - den : Denominator 1365 // 1366 // Return value : Result of the division (as a WebRtc_Word32), i.e., the 1367 // integer part of num/den. 1368 // 1369 1370 // 1371 // WebRtcSpl_DivW32W16ResW16(...) 1372 // 1373 // Divides a WebRtc_Word32 |num| by a WebRtc_Word16 |den|, assuming that the 1374 // result is less than 32768, otherwise an unpredictable result will occur. 1375 // 1376 // If |den|==0, (WebRtc_Word16)0x7FFF is returned. 1377 // 1378 // Input: 1379 // - num : Numerator 1380 // - den : Denominator 1381 // 1382 // Return value : Result of the division (as a WebRtc_Word16), i.e., the 1383 // integer part of num/den. 1384 // 1385 1386 // 1387 // WebRtcSpl_DivResultInQ31(...) 1388 // 1389 // Divides a WebRtc_Word32 |num| by a WebRtc_Word16 |den|, assuming that the 1390 // absolute value of the denominator is larger than the numerator, otherwise 1391 // an unpredictable result will occur. 1392 // 1393 // Input: 1394 // - num : Numerator 1395 // - den : Denominator 1396 // 1397 // Return value : Result of the division in Q31. 1398 // 1399 1400 // 1401 // WebRtcSpl_DivW32HiLow(...) 1402 // 1403 // Divides a WebRtc_Word32 |num| by a denominator in hi, low format. The 1404 // absolute value of the denominator has to be larger (or equal to) the 1405 // numerator. 1406 // 1407 // Input: 1408 // - num : Numerator 1409 // - den_hi : High part of denominator 1410 // - den_low : Low part of denominator 1411 // 1412 // Return value : Divided value in Q31 1413 // 1414 1415 // 1416 // WebRtcSpl_Energy(...) 1417 // 1418 // Calculates the energy of a vector 1419 // 1420 // Input: 1421 // - vector : Vector which the energy should be calculated on 1422 // - vector_length : Number of samples in vector 1423 // 1424 // Output: 1425 // - scale_factor : Number of left bit shifts needed to get the physical 1426 // energy value, i.e, to get the Q0 value 1427 // 1428 // Return value : Energy value in Q(-|scale_factor|) 1429 // 1430 1431 // 1432 // WebRtcSpl_FilterAR(...) 1433 // 1434 // Performs a 32-bit AR filtering on a vector in Q12 1435 // 1436 // Input: 1437 // - ar_coef : AR-coefficient vector (values in Q12), 1438 // ar_coef[0] must be 4096. 1439 // - ar_coef_length : Number of coefficients in |ar_coef|. 1440 // - in_vector : Vector to be filtered. 1441 // - in_vector_length : Number of samples in |in_vector|. 1442 // - filter_state : Current state (higher part) of the filter. 1443 // - filter_state_length : Length (in samples) of |filter_state|. 1444 // - filter_state_low : Current state (lower part) of the filter. 1445 // - filter_state_low_length : Length (in samples) of |filter_state_low|. 1446 // - out_vector_low_length : Maximum length (in samples) of 1447 // |out_vector_low|. 1448 // 1449 // Output: 1450 // - filter_state : Updated state (upper part) vector. 1451 // - filter_state_low : Updated state (lower part) vector. 1452 // - out_vector : Vector containing the upper part of the 1453 // filtered values. 1454 // - out_vector_low : Vector containing the lower part of the 1455 // filtered values. 1456 // 1457 // Return value : Number of samples in the |out_vector|. 1458 // 1459 1460 // 1461 // WebRtcSpl_FilterMAFastQ12(...) 1462 // 1463 // Performs a MA filtering on a vector in Q12 1464 // 1465 // Input: 1466 // - in_vector : Input samples (state in positions 1467 // in_vector[-order] .. in_vector[-1]) 1468 // - ma_coef : Filter coefficients (in Q12) 1469 // - ma_coef_length : Number of B coefficients (order+1) 1470 // - vector_length : Number of samples to be filtered 1471 // 1472 // Output: 1473 // - out_vector : Filtered samples 1474 // 1475 1476 // 1477 // WebRtcSpl_FilterARFastQ12(...) 1478 // 1479 // Performs a AR filtering on a vector in Q12 1480 // 1481 // Input: 1482 // - in_vector : Input samples 1483 // - out_vector : State information in positions 1484 // out_vector[-order] .. out_vector[-1] 1485 // - ar_coef : Filter coefficients (in Q12) 1486 // - ar_coef_length : Number of B coefficients (order+1) 1487 // - vector_length : Number of samples to be filtered 1488 // 1489 // Output: 1490 // - out_vector : Filtered samples 1491 // 1492 1493 // 1494 // WebRtcSpl_DownsampleFast(...) 1495 // 1496 // Performs a MA down sampling filter on a vector 1497 // 1498 // Input: 1499 // - in_vector : Input samples (state in positions 1500 // in_vector[-order] .. in_vector[-1]) 1501 // - in_vector_length : Number of samples in |in_vector| to be filtered. 1502 // This must be at least 1503 // |delay| + |factor|*(|out_vector_length|-1) + 1) 1504 // - out_vector_length : Number of down sampled samples desired 1505 // - ma_coef : Filter coefficients (in Q12) 1506 // - ma_coef_length : Number of B coefficients (order+1) 1507 // - factor : Decimation factor 1508 // - delay : Delay of filter (compensated for in out_vector) 1509 // 1510 // Output: 1511 // - out_vector : Filtered samples 1512 // 1513 // Return value : 0 if OK, -1 if |in_vector| is too short 1514 // 1515 1516 // 1517 // WebRtcSpl_DotProductWithScale(...) 1518 // 1519 // Calculates the dot product between two (WebRtc_Word16) vectors 1520 // 1521 // Input: 1522 // - vector1 : Vector 1 1523 // - vector2 : Vector 2 1524 // - vector_length : Number of samples used in the dot product 1525 // - scaling : The number of right bit shifts to apply on each term 1526 // during calculation to avoid overflow, i.e., the 1527 // output will be in Q(-|scaling|) 1528 // 1529 // Return value : The dot product in Q(-scaling) 1530 // 1531 1532 // 1533 // WebRtcSpl_ComplexIFFT(...) 1534 // 1535 // Complex Inverse FFT 1536 // 1537 // Computes an inverse complex 2^|stages|-point FFT on the input vector, which 1538 // is in bit-reversed order. The original content of the vector is destroyed in 1539 // the process, since the input is overwritten by the output, normal-ordered, 1540 // FFT vector. With X as the input complex vector, y as the output complex 1541 // vector and with M = 2^|stages|, the following is computed: 1542 // 1543 // M-1 1544 // y(k) = sum[X(i)*[cos(2*pi*i*k/M) + j*sin(2*pi*i*k/M)]] 1545 // i=0 1546 // 1547 // The implementations are optimized for speed, not for code size. It uses the 1548 // decimation-in-time algorithm with radix-2 butterfly technique. 1549 // 1550 // Input: 1551 // - vector : In pointer to complex vector containing 2^|stages| 1552 // real elements interleaved with 2^|stages| imaginary 1553 // elements. 1554 // [ReImReImReIm....] 1555 // The elements are in Q(-scale) domain, see more on Return 1556 // Value below. 1557 // 1558 // - stages : Number of FFT stages. Must be at least 3 and at most 10, 1559 // since the table WebRtcSpl_kSinTable1024[] is 1024 1560 // elements long. 1561 // 1562 // - mode : This parameter gives the user to choose how the FFT 1563 // should work. 1564 // mode==0: Low-complexity and Low-accuracy mode 1565 // mode==1: High-complexity and High-accuracy mode 1566 // 1567 // Output: 1568 // - vector : Out pointer to the FFT vector (the same as input). 1569 // 1570 // Return Value : The scale value that tells the number of left bit shifts 1571 // that the elements in the |vector| should be shifted with 1572 // in order to get Q0 values, i.e. the physically correct 1573 // values. The scale parameter is always 0 or positive, 1574 // except if N>1024 (|stages|>10), which returns a scale 1575 // value of -1, indicating error. 1576 // 1577 1578 #if (defined ARM9E_GCC) || (defined ARM_WINM) || (defined ANDROID_AECOPT) 1579 // 1580 // WebRtcSpl_ComplexIFFT2(...) 1581 // 1582 // Complex or Real inverse FFT, for ARM processor only 1583 // 1584 // Computes a 2^|stages|-point FFT on the input vector, which can be or not be 1585 // in bit-reversed order. If it is bit-reversed, the original content of the 1586 // vector could be overwritten by the output by setting the first two arguments 1587 // the same. With X as the input complex vector, y as the output complex vector 1588 // and with M = 2^|stages|, the following is computed: 1589 // 1590 // M-1 1591 // y(k) = sum[X(i)*[cos(2*pi*i*k/M) + j*sin(2*pi*i*k/M)]] 1592 // i=0 1593 // 1594 // The implementations are optimized for speed, not for code size. It uses the 1595 // decimation-in-time algorithm with radix-2 butterfly technique. 1596 // 1597 // Arguments: 1598 // - in_vector : In pointer to complex vector containing 2^|stages| 1599 // real elements interleaved with 2^|stages| imaginary 1600 // elements. [ReImReImReIm....] 1601 // The elements are in Q(-scale) domain. 1602 // - out_vector : Output pointer to vector containing 2^|stages| real 1603 // elements interleaved with 2^|stages| imaginary 1604 // elements. [ReImReImReIm....] 1605 // The output is in the Q0 domain. 1606 // - stages : Number of FFT stages. Must be at least 3 and at most 1607 // 10. 1608 // - mode : Dummy input. 1609 // 1610 // Return value : The scale parameter is always 0, except if N>1024, 1611 // which returns a scale value of -1, indicating error. 1612 // 1613 #endif 1614 1615 // 1616 // WebRtcSpl_ComplexFFT(...) 1617 // 1618 // Complex FFT 1619 // 1620 // Computes a complex 2^|stages|-point FFT on the input vector, which is in 1621 // bit-reversed order. The original content of the vector is destroyed in 1622 // the process, since the input is overwritten by the output, normal-ordered, 1623 // FFT vector. With x as the input complex vector, Y as the output complex 1624 // vector and with M = 2^|stages|, the following is computed: 1625 // 1626 // M-1 1627 // Y(k) = 1/M * sum[x(i)*[cos(2*pi*i*k/M) + j*sin(2*pi*i*k/M)]] 1628 // i=0 1629 // 1630 // The implementations are optimized for speed, not for code size. It uses the 1631 // decimation-in-time algorithm with radix-2 butterfly technique. 1632 // 1633 // This routine prevents overflow by scaling by 2 before each FFT stage. This is 1634 // a fixed scaling, for proper normalization - there will be log2(n) passes, so 1635 // this results in an overall factor of 1/n, distributed to maximize arithmetic 1636 // accuracy. 1637 // 1638 // Input: 1639 // - vector : In pointer to complex vector containing 2^|stages| real 1640 // elements interleaved with 2^|stages| imaginary elements. 1641 // [ReImReImReIm....] 1642 // The output is in the Q0 domain. 1643 // 1644 // - stages : Number of FFT stages. Must be at least 3 and at most 10, 1645 // since the table WebRtcSpl_kSinTable1024[] is 1024 1646 // elements long. 1647 // 1648 // - mode : This parameter gives the user to choose how the FFT 1649 // should work. 1650 // mode==0: Low-complexity and Low-accuracy mode 1651 // mode==1: High-complexity and High-accuracy mode 1652 // 1653 // Output: 1654 // - vector : The output FFT vector is in the Q0 domain. 1655 // 1656 // Return value : The scale parameter is always 0, except if N>1024, 1657 // which returns a scale value of -1, indicating error. 1658 // 1659 1660 #if (defined ARM9E_GCC) || (defined ARM_WINM) || (defined ANDROID_AECOPT) 1661 // 1662 // WebRtcSpl_ComplexFFT2(...) 1663 // 1664 // Complex or Real FFT, for ARM processor only 1665 // 1666 // Computes a 2^|stages|-point FFT on the input vector, which can be or not be 1667 // in bit-reversed order. If it is bit-reversed, the original content of the 1668 // vector could be overwritten by the output by setting the first two arguments 1669 // the same. With x as the input complex vector, Y as the output complex vector 1670 // and with M = 2^|stages|, the following is computed: 1671 // 1672 // M-1 1673 // Y(k) = 1/M * sum[x(i)*[cos(2*pi*i*k/M) + j*sin(2*pi*i*k/M)]] 1674 // i=0 1675 // 1676 // The implementations are optimized for speed, not for code size. It uses the 1677 // decimation-in-time algorithm with radix-2 butterfly technique. 1678 // 1679 // Arguments: 1680 // - in_vector : In pointer to complex vector containing 2^|stages| 1681 // real elements interleaved with 2^|stages| imaginary 1682 // elements. [ReImReImReIm....] 1683 // - out_vector : Output pointer to vector containing 2^|stages| real 1684 // elements interleaved with 2^|stages| imaginary 1685 // elements. [ReImReImReIm....] 1686 // The output is in the Q0 domain. 1687 // - stages : Number of FFT stages. Must be at least 3 and at most 1688 // 10. 1689 // - mode : Dummy input 1690 // 1691 // Return value : The scale parameter is always 0, except if N>1024, 1692 // which returns a scale value of -1, indicating error. 1693 // 1694 #endif 1695 1696 // 1697 // WebRtcSpl_ComplexBitReverse(...) 1698 // 1699 // Complex Bit Reverse 1700 // 1701 // This function bit-reverses the position of elements in the complex input 1702 // vector into the output vector. 1703 // 1704 // If you bit-reverse a linear-order array, you obtain a bit-reversed order 1705 // array. If you bit-reverse a bit-reversed order array, you obtain a 1706 // linear-order array. 1707 // 1708 // Input: 1709 // - vector : In pointer to complex vector containing 2^|stages| real 1710 // elements interleaved with 2^|stages| imaginary elements. 1711 // [ReImReImReIm....] 1712 // - stages : Number of FFT stages. Must be at least 3 and at most 10, 1713 // since the table WebRtcSpl_kSinTable1024[] is 1024 1714 // elements long. 1715 // 1716 // Output: 1717 // - vector : Out pointer to complex vector in bit-reversed order. 1718 // The input vector is over written. 1719 // 1720 1721 // 1722 // WebRtcSpl_AnalysisQMF(...) 1723 // 1724 // Splits a 0-2*F Hz signal into two sub bands: 0-F Hz and F-2*F Hz. The 1725 // current version has F = 8000, therefore, a super-wideband audio signal is 1726 // split to lower-band 0-8 kHz and upper-band 8-16 kHz. 1727 // 1728 // Input: 1729 // - in_data : Wide band speech signal, 320 samples (10 ms) 1730 // 1731 // Input & Output: 1732 // - filter_state1 : Filter state for first All-pass filter 1733 // - filter_state2 : Filter state for second All-pass filter 1734 // 1735 // Output: 1736 // - low_band : Lower-band signal 0-8 kHz band, 160 samples (10 ms) 1737 // - high_band : Upper-band signal 8-16 kHz band (flipped in frequency 1738 // domain), 160 samples (10 ms) 1739 // 1740 1741 // 1742 // WebRtcSpl_SynthesisQMF(...) 1743 // 1744 // Combines the two sub bands (0-F and F-2*F Hz) into a signal of 0-2*F 1745 // Hz, (current version has F = 8000 Hz). So the filter combines lower-band 1746 // (0-8 kHz) and upper-band (8-16 kHz) channels to obtain super-wideband 0-16 1747 // kHz audio. 1748 // 1749 // Input: 1750 // - low_band : The signal with the 0-8 kHz band, 160 samples (10 ms) 1751 // - high_band : The signal with the 8-16 kHz band, 160 samples (10 ms) 1752 // 1753 // Input & Output: 1754 // - filter_state1 : Filter state for first All-pass filter 1755 // - filter_state2 : Filter state for second All-pass filter 1756 // 1757 // Output: 1758 // - out_data : Super-wideband speech signal, 0-16 kHz 1759 // 1760 1761 // WebRtc_Word16 WebRtcSpl_get_version(...) 1762 // 1763 // This function gives the version string of the Signal Processing Library. 1764 // 1765 // Input: 1766 // - length_in_bytes : The size of Allocated space (in Bytes) where 1767 // the version number is written to (in string format). 1768 // 1769 // Output: 1770 // - version : Pointer to a buffer where the version number is written to. 1771 // 1772
