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Diffstat (limited to 'media/libstagefright/codecs/amrnb/enc/src/inter_36.cpp')
| -rw-r--r-- | media/libstagefright/codecs/amrnb/enc/src/inter_36.cpp | 250 |
1 files changed, 250 insertions, 0 deletions
diff --git a/media/libstagefright/codecs/amrnb/enc/src/inter_36.cpp b/media/libstagefright/codecs/amrnb/enc/src/inter_36.cpp new file mode 100644 index 0000000..87766a9 --- /dev/null +++ b/media/libstagefright/codecs/amrnb/enc/src/inter_36.cpp @@ -0,0 +1,250 @@ +/* ------------------------------------------------------------------ + * 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. +****************************************************************************************/ +/* +------------------------------------------------------------------------------ + + + + Pathname: ./audio/gsm-amr/c/src/inter_36.c + + Date: 01/31/2002 + +------------------------------------------------------------------------------ + REVISION HISTORY + + Description: + 1. Eliminated unused include files. + 2. Replaced array addressing by pointers + 3. Eliminated math operations that unnecessary checked for + saturation + 4. Unrolled loops to speed up processing, use decrement loops + 5. Eliminated call to round by proper initialization + + Description: Added casting to eliminate warnings + + Description: Replaced "int" and/or "char" with OSCL defined types. + + Description: Changed round function name to pv_round to avoid conflict with + round function in C standard library. + + Description: Using intrinsics from fxp_arithmetic.h . + + Description: Replacing fxp_arithmetic.h with basic_op.h. + + Description: + +------------------------------------------------------------------------------ +*/ + +/*---------------------------------------------------------------------------- +; INCLUDES +----------------------------------------------------------------------------*/ +#include "inter_36.h" +#include "cnst.h" +#include "inter_36_tab.h" +#include "basic_op.h" + +/*---------------------------------------------------------------------------- +; MACROS +; Define module specific macros here +----------------------------------------------------------------------------*/ + + +/*---------------------------------------------------------------------------- +; DEFINES +; Include all pre-processor statements here. Include conditional +; compile variables also. +----------------------------------------------------------------------------*/ +#define UP_SAMP_MAX 6 + +/*---------------------------------------------------------------------------- +; LOCAL FUNCTION DEFINITIONS +; Function Prototype declaration +----------------------------------------------------------------------------*/ + + +/*---------------------------------------------------------------------------- +; LOCAL STORE/BUFFER/POINTER DEFINITIONS +; Variable declaration - defined here and used outside this module +----------------------------------------------------------------------------*/ + + +/* +------------------------------------------------------------------------------ + FUNCTION NAME: inter_36 +------------------------------------------------------------------------------ + INPUT AND OUTPUT DEFINITIONS + + Inputs: + pX = pointer to input vector of type Word16 + frac = fraction (-2..2 for 3*, -3..3 for 6*) of type Word16 + flag3 = if set, upsampling rate = 3 (6 otherwise) of type Word16 + pOverflow = pointer to overflow flag + + Outputs: + None + + Returns: + None + + Global Variables Used: + None. + + Local Variables Needed: + None. + +------------------------------------------------------------------------------ + FUNCTION DESCRIPTION + + File : inter_36.c + Purpose : Interpolating the normalized correlation + : with 1/3 or 1/6 resolution. + +------------------------------------------------------------------------------ + REQUIREMENTS + + None. + +------------------------------------------------------------------------------ + REFERENCES + + inter_36.c, UMTS GSM AMR speech codec, R99 - Version 3.2.0, March 2, 2001 + +------------------------------------------------------------------------------ + PSEUDO-CODE + + Word16 i, k; + Word16 *x1, *x2; + const Word16 *c1, *c2; + Word32 s; + + if (flag3 != 0) + { + frac = shl (frac, 1); // inter_3[k] = inter_6[2*k] -> k' = 2*k + } + + if (frac < 0) + { + frac = add (frac, UP_SAMP_MAX); + x--; + } + + x1 = &x[0]; + x2 = &x[1]; + c1 = &inter_6[frac]; + c2 = &inter_6[sub (UP_SAMP_MAX, frac)]; + + s = 0; + for (i = 0, k = 0; i < L_INTER_SRCH; i++, k += UP_SAMP_MAX) + { + s = L_mac (s, x1[-i], c1[k]); + s = L_mac (s, x2[i], c2[k]); + } + + return pv_round (s); + +------------------------------------------------------------------------------ + RESOURCES USED [optional] + + When the code is written for a specific target processor the + the resources used should be documented below. + + HEAP MEMORY USED: x bytes + + STACK MEMORY USED: x bytes + + CLOCK CYCLES: (cycle count equation for this function) + (variable + used to represent cycle count for each subroutine + called) + where: (cycle count variable) = cycle count for [subroutine + name] + +------------------------------------------------------------------------------ + CAUTION [optional] + [State any special notes, constraints or cautions for users of this function] + +------------------------------------------------------------------------------ +*/ +Word16 Interpol_3or6( /* o : interpolated value */ + Word16 *pX, /* i : input vector */ + Word16 frac, /* i : fraction (-2..2 for 3*, -3..3 for 6*) */ + Word16 flag3, /* i : if set, upsampling rate = 3 (6 otherwise) */ + Flag *pOverflow +) +{ + Word16 i; + Word16 k; + Word16 *pX1; + Word16 *pX2; + const Word16 *pC1; + const Word16 *pC2; + Word32 s; + Word16 temp1; + + OSCL_UNUSED_ARG(pOverflow); + + if (flag3 != 0) + { + frac <<= 1; + /* inter_3[k] = inter_6[2*k] -> k' = 2*k */ + } + + if (frac < 0) + { + frac += UP_SAMP_MAX; + pX--; + } + + pX1 = &pX[0]; + pX2 = &pX[1]; + pC1 = &inter_6[frac]; + temp1 = UP_SAMP_MAX - frac; + pC2 = &inter_6[temp1]; + + s = 0x04000; + k = 0; + + for (i = (L_INTER_SRCH >> 1); i != 0; i--) + { + s = amrnb_fxp_mac_16_by_16bb((Word32) * (pX1--), (Word32) pC1[k], s); + s = amrnb_fxp_mac_16_by_16bb((Word32) * (pX2++), (Word32) pC2[k], s); + k += UP_SAMP_MAX; + s = amrnb_fxp_mac_16_by_16bb((Word32) * (pX1--), (Word32) pC1[k], s); + s = amrnb_fxp_mac_16_by_16bb((Word32) * (pX2++), (Word32) pC2[k], s); + k <<= 1; + } + + return((Word16)(s >> 15)); +} + + + + + + |