diff options
Diffstat (limited to 'opencore/codecs_v2/audio/gsm_amr/amr_wb/dec/src/scale_signal.cpp')
-rw-r--r-- | opencore/codecs_v2/audio/gsm_amr/amr_wb/dec/src/scale_signal.cpp | 146 |
1 files changed, 146 insertions, 0 deletions
diff --git a/opencore/codecs_v2/audio/gsm_amr/amr_wb/dec/src/scale_signal.cpp b/opencore/codecs_v2/audio/gsm_amr/amr_wb/dec/src/scale_signal.cpp new file mode 100644 index 0000000..d225d28 --- /dev/null +++ b/opencore/codecs_v2/audio/gsm_amr/amr_wb/dec/src/scale_signal.cpp @@ -0,0 +1,146 @@ +/* ------------------------------------------------------------------ + * 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 26.173 + ANSI-C code for the Adaptive Multi-Rate - Wideband (AMR-WB) speech codec + Available from http://www.3gpp.org + +(C) 2007, 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. +****************************************************************************************/ +/* +------------------------------------------------------------------------------ + + + + Filename: scale_signal.cpp + +------------------------------------------------------------------------------ + INPUT AND OUTPUT DEFINITIONS + + int16 signal[], (i/o) : signal to scale + int16 lg, (i) : size of x[] + int16 exp (i) : exponent: x = round(x << exp) + +------------------------------------------------------------------------------ + FUNCTION DESCRIPTION + + Scale signal to get maximum of dynamic range + + +------------------------------------------------------------------------------ + REQUIREMENTS + + +------------------------------------------------------------------------------ + REFERENCES + +------------------------------------------------------------------------------ + PSEUDO-CODE + +------------------------------------------------------------------------------ +*/ + + +/*---------------------------------------------------------------------------- +; INCLUDES +----------------------------------------------------------------------------*/ + +#include "pv_amr_wb_type_defs.h" +#include "pvamrwbdecoder_basic_op.h" +#include "pvamrwbdecoder_acelp.h" + +/*---------------------------------------------------------------------------- +; MACROS +; Define module specific macros here +----------------------------------------------------------------------------*/ + + +/*---------------------------------------------------------------------------- +; DEFINES +; Include all pre-processor statements here. Include conditional +; compile variables also. +----------------------------------------------------------------------------*/ + +/*---------------------------------------------------------------------------- +; LOCAL FUNCTION DEFINITIONS +; Function Prototype declaration +----------------------------------------------------------------------------*/ + +/*---------------------------------------------------------------------------- +; LOCAL STORE/BUFFER/POINTER DEFINITIONS +; Variable declaration - defined here and used outside this module +----------------------------------------------------------------------------*/ + +/*---------------------------------------------------------------------------- +; EXTERNAL FUNCTION REFERENCES +; Declare functions defined elsewhere and referenced in this module +----------------------------------------------------------------------------*/ + +/*---------------------------------------------------------------------------- +; EXTERNAL GLOBAL STORE/BUFFER/POINTER REFERENCES +; Declare variables used in this module but defined elsewhere +----------------------------------------------------------------------------*/ + +/*---------------------------------------------------------------------------- +; FUNCTION CODE +----------------------------------------------------------------------------*/ + +void scale_signal( + int16 x[], /* (i/o) : signal to scale */ + int16 lg, /* (i) : size of x[] */ + int16 exp /* (i) : exponent: x = round(x << exp) */ +) +{ + int16 i; + int16 tmp; + int16 *pt_x; + + + int32 L_tmp; + + + if (exp > 0) + { + for (i = 0; i < lg; i++) + { + L_tmp = shl_int32(((int32)x[i] << 16), exp); /* saturation can occur here */ + x[i] = amr_wb_round(L_tmp); + } + } + else if (exp < 0) + { + exp = -exp; + exp &= 0xf; + tmp = (int16)(0x00008000 >> (16 - exp)); + pt_x = x; + + for (i = lg >> 1; i != 0; i--) + { + *(pt_x) = add_int16(*(pt_x), tmp) >> exp; + pt_x++; + *(pt_x) = add_int16(*(pt_x), tmp) >> exp; + pt_x++; + } + + } + return; +} |