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Diffstat (limited to 'media/libstagefright/codecs/amrwb/src/low_pass_filt_7k.cpp')
| -rw-r--r-- | media/libstagefright/codecs/amrwb/src/low_pass_filt_7k.cpp | 220 |
1 files changed, 220 insertions, 0 deletions
diff --git a/media/libstagefright/codecs/amrwb/src/low_pass_filt_7k.cpp b/media/libstagefright/codecs/amrwb/src/low_pass_filt_7k.cpp new file mode 100644 index 0000000..ec1d6e0 --- /dev/null +++ b/media/libstagefright/codecs/amrwb/src/low_pass_filt_7k.cpp @@ -0,0 +1,220 @@ +/* ------------------------------------------------------------------ + * 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: low_pass_filt_7k.cpp + + Date: 05/08/2004 + +------------------------------------------------------------------------------ + REVISION HISTORY + + + Description: + +------------------------------------------------------------------------------ + INPUT AND OUTPUT DEFINITIONS + + int16 signal[], input signal / output is divided by 16 + int16 lg, lenght of signal + int16 mem[] in/out: memory (size=30) + int16 x[] scratch mem ( size= 60) + +------------------------------------------------------------------------------ + FUNCTION DESCRIPTION + + 15th order high pass 7kHz FIR filter + + +------------------------------------------------------------------------------ + REQUIREMENTS + + +------------------------------------------------------------------------------ + REFERENCES + +------------------------------------------------------------------------------ + PSEUDO-CODE + +------------------------------------------------------------------------------ +*/ + + +/*---------------------------------------------------------------------------- +; INCLUDES +----------------------------------------------------------------------------*/ + +#include "pv_amr_wb_type_defs.h" +#include "pvamrwbdecoder_basic_op.h" +#include "pvamrwbdecoder_cnst.h" +#include "pvamrwbdecoder_acelp.h" + +/*---------------------------------------------------------------------------- +; MACROS +; Define module specific macros here +----------------------------------------------------------------------------*/ + + +/*---------------------------------------------------------------------------- +; DEFINES +; Include all pre-processor statements here. Include conditional +; compile variables also. +----------------------------------------------------------------------------*/ +#define L_FIR 30 + +/*---------------------------------------------------------------------------- +; LOCAL FUNCTION DEFINITIONS +; Function Prototype declaration +----------------------------------------------------------------------------*/ + +/*---------------------------------------------------------------------------- +; LOCAL STORE/BUFFER/POINTER DEFINITIONS +; Variable declaration - defined here and used outside this module +----------------------------------------------------------------------------*/ +const int16 fir_7k[L_FIR+1] = +{ + -21, 47, -89, 146, -203, + 229, -177, 0, 335, -839, + 1485, -2211, 2931, -3542, 3953, + 28682, 3953, -3542, 2931, -2211, + 1485, -839, 335, 0, -177, + 229, -203, 146, -89, 47, + -21 +}; + +/*---------------------------------------------------------------------------- +; 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 low_pass_filt_7k_init(int16 mem[]) /* mem[30] */ +{ + pv_memset((void *)mem, 0, (L_FIR)*sizeof(*mem)); + + return; +} + + +/*---------------------------------------------------------------------------- +; FUNCTION CODE +----------------------------------------------------------------------------*/ + + +void low_pass_filt_7k( + int16 signal[], /* input: signal */ + int16 lg, /* input: length of input */ + int16 mem[], /* in/out: memory (size=30) */ + int16 x[] +) +{ + int16 i, j; + int32 L_tmp1; + int32 L_tmp2; + int32 L_tmp3; + int32 L_tmp4; + + pv_memcpy((void *)x, (void *)mem, (L_FIR)*sizeof(*x)); + + for (i = 0; i < lg >> 2; i++) + { + x[(i<<2) + L_FIR ] = signal[(i<<2)]; + x[(i<<2) + L_FIR + 1] = signal[(i<<2)+1]; + x[(i<<2) + L_FIR + 2] = signal[(i<<2)+2]; + x[(i<<2) + L_FIR + 3] = signal[(i<<2)+3]; + + L_tmp1 = fxp_mac_16by16(x[(i<<2)] + signal[(i<<2)], fir_7k[0], 0x00004000); + L_tmp2 = fxp_mac_16by16(x[(i<<2)+1] + signal[(i<<2)+1], fir_7k[0], 0x00004000); + L_tmp3 = fxp_mac_16by16(x[(i<<2)+2] + signal[(i<<2)+2], fir_7k[0], 0x00004000); + L_tmp4 = fxp_mac_16by16(x[(i<<2)+3] + signal[(i<<2)+3], fir_7k[0], 0x00004000); + + for (j = 1; j < L_FIR - 1; j += 4) + { + + + int16 tmp1 = x[(i<<2)+j ]; + int16 tmp2 = x[(i<<2)+j+1]; + int16 tmp3 = x[(i<<2)+j+2]; + + L_tmp1 = fxp_mac_16by16(tmp1, fir_7k[j ], L_tmp1); + L_tmp2 = fxp_mac_16by16(tmp2, fir_7k[j ], L_tmp2); + L_tmp1 = fxp_mac_16by16(tmp2, fir_7k[j+1], L_tmp1); + L_tmp2 = fxp_mac_16by16(tmp3, fir_7k[j+1], L_tmp2); + L_tmp3 = fxp_mac_16by16(tmp3, fir_7k[j ], L_tmp3); + L_tmp1 = fxp_mac_16by16(tmp3, fir_7k[j+2], L_tmp1); + + tmp1 = x[(i<<2)+j+3]; + tmp2 = x[(i<<2)+j+4]; + + L_tmp2 = fxp_mac_16by16(tmp1, fir_7k[j+2], L_tmp2); + L_tmp4 = fxp_mac_16by16(tmp1, fir_7k[j ], L_tmp4); + L_tmp3 = fxp_mac_16by16(tmp1, fir_7k[j+1], L_tmp3); + L_tmp1 = fxp_mac_16by16(tmp1, fir_7k[j+3], L_tmp1); + L_tmp2 = fxp_mac_16by16(tmp2, fir_7k[j+3], L_tmp2); + L_tmp4 = fxp_mac_16by16(tmp2, fir_7k[j+1], L_tmp4); + L_tmp3 = fxp_mac_16by16(tmp2, fir_7k[j+2], L_tmp3); + + tmp1 = x[(i<<2)+j+5]; + tmp2 = x[(i<<2)+j+6]; + + L_tmp4 = fxp_mac_16by16(tmp1, fir_7k[j+2], L_tmp4); + L_tmp3 = fxp_mac_16by16(tmp1, fir_7k[j+3], L_tmp3); + L_tmp4 = fxp_mac_16by16(tmp2, fir_7k[j+3], L_tmp4); + + } + + L_tmp1 = fxp_mac_16by16(x[(i<<2)+j ], fir_7k[j ], L_tmp1); + L_tmp2 = fxp_mac_16by16(x[(i<<2)+j+1], fir_7k[j ], L_tmp2); + L_tmp3 = fxp_mac_16by16(x[(i<<2)+j+2], fir_7k[j ], L_tmp3); + L_tmp4 = fxp_mac_16by16(x[(i<<2)+j+3], fir_7k[j ], L_tmp4); + + signal[(i<<2)] = (int16)(L_tmp1 >> 15); + signal[(i<<2)+1] = (int16)(L_tmp2 >> 15); + signal[(i<<2)+2] = (int16)(L_tmp3 >> 15); + signal[(i<<2)+3] = (int16)(L_tmp4 >> 15); + + } + + pv_memcpy((void *)mem, (void *)(x + lg), (L_FIR)*sizeof(*mem)); + + return; +} + |