diff options
Diffstat (limited to 'opencore/codecs_v2/audio/gsm_amr/amr_wb/dec/src/preemph_amrwb_dec.cpp')
-rw-r--r-- | opencore/codecs_v2/audio/gsm_amr/amr_wb/dec/src/preemph_amrwb_dec.cpp | 122 |
1 files changed, 122 insertions, 0 deletions
diff --git a/opencore/codecs_v2/audio/gsm_amr/amr_wb/dec/src/preemph_amrwb_dec.cpp b/opencore/codecs_v2/audio/gsm_amr/amr_wb/dec/src/preemph_amrwb_dec.cpp new file mode 100644 index 0000000..78359e2 --- /dev/null +++ b/opencore/codecs_v2/audio/gsm_amr/amr_wb/dec/src/preemph_amrwb_dec.cpp @@ -0,0 +1,122 @@ +/* ------------------------------------------------------------------ + * 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: preemph_amrwb_dec.cpp + +------------------------------------------------------------------------------ + INPUT AND OUTPUT DEFINITIONS + + int16 x[], (i/o) : input signal overwritten by the output + int16 mu, (i) Q15 : preemphasis coefficient + int16 lg (i) : lenght of filtering + +------------------------------------------------------------------------------ + FUNCTION DESCRIPTION + + Preemphasis: filtering through 1 - g z^-1 + +------------------------------------------------------------------------------ + 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 preemph_amrwb_dec( + int16 x[], /* (i/o) : input signal overwritten by the output */ + int16 mu, /* (i) Q15 : preemphasis coefficient */ + int16 lg /* (i) : lenght of filtering */ +) +{ + int16 i; + int32 L_tmp; + + for (i = lg - 1; i != 0; i--) + { + L_tmp = msu_16by16_from_int32((int32)x[i] << 16, x[i - 1], mu); + x[i] = amr_wb_round(L_tmp); + } + +} + |