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Diffstat (limited to 'media/libstagefright/codecs/amrwb/src/phase_dispersion.cpp')
| -rw-r--r-- | media/libstagefright/codecs/amrwb/src/phase_dispersion.cpp | 261 |
1 files changed, 261 insertions, 0 deletions
diff --git a/media/libstagefright/codecs/amrwb/src/phase_dispersion.cpp b/media/libstagefright/codecs/amrwb/src/phase_dispersion.cpp new file mode 100644 index 0000000..f90a534 --- /dev/null +++ b/media/libstagefright/codecs/amrwb/src/phase_dispersion.cpp @@ -0,0 +1,261 @@ +/* ------------------------------------------------------------------ + * 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: phase_dispersion.cpp + + Date: 05/08/2007 + +------------------------------------------------------------------------------ + REVISION HISTORY + + + Description: + +------------------------------------------------------------------------------ + INPUT AND OUTPUT DEFINITIONS + + int16 gain_code, (i) Q0 : gain of code + int16 gain_pit, (i) Q14 : gain of pitch + int16 code[], (i/o) : code vector + int16 mode, (i) : level, 0=hi, 1=lo, 2=off + int16 disp_mem[], (i/o) : static memory (size = 8) + int16 ScratchMem[] + +------------------------------------------------------------------------------ + FUNCTION DESCRIPTION + + post-processing to enhance noise in low bit rate. + +------------------------------------------------------------------------------ + REQUIREMENTS + + +------------------------------------------------------------------------------ + REFERENCES + +------------------------------------------------------------------------------ + PSEUDO-CODE + +------------------------------------------------------------------------------ +*/ + + +/*---------------------------------------------------------------------------- +; INCLUDES +----------------------------------------------------------------------------*/ + +#include "pv_amr_wb_type_defs.h" +#include "pvamrwbdecoder_basic_op.h" +#include "pvamrwbdecoder_cnst.h" +#include "pvamrwbdecoder_mem_funcs.h" +#include "pvamrwbdecoder_acelp.h" +#include "pvamrwb_math_op.h" + + +/*---------------------------------------------------------------------------- +; MACROS +; Define module specific macros here +----------------------------------------------------------------------------*/ + + +/*---------------------------------------------------------------------------- +; DEFINES +; Include all pre-processor statements here. Include conditional +; compile variables also. +----------------------------------------------------------------------------*/ +#define pitch_0_9 14746 /* 0.9 in Q14 */ +#define pitch_0_6 9830 /* 0.6 in Q14 */ +#define L_SUBFR 64 + +/*---------------------------------------------------------------------------- +; LOCAL FUNCTION DEFINITIONS +; Function Prototype declaration +----------------------------------------------------------------------------*/ + +/*---------------------------------------------------------------------------- +; LOCAL STORE/BUFFER/POINTER DEFINITIONS +; Variable declaration - defined here and used outside this module +----------------------------------------------------------------------------*/ +/* impulse response with phase dispersion */ + +/* 2.0 - 6.4 kHz phase dispersion */ +const int16 ph_imp_low[L_SUBFR] = +{ + 20182, 9693, 3270, -3437, 2864, -5240, 1589, -1357, + 600, 3893, -1497, -698, 1203, -5249, 1199, 5371, + -1488, -705, -2887, 1976, 898, 721, -3876, 4227, + -5112, 6400, -1032, -4725, 4093, -4352, 3205, 2130, + -1996, -1835, 2648, -1786, -406, 573, 2484, -3608, + 3139, -1363, -2566, 3808, -639, -2051, -541, 2376, + 3932, -6262, 1432, -3601, 4889, 370, 567, -1163, + -2854, 1914, 39, -2418, 3454, 2975, -4021, 3431 +}; + +/* 3.2 - 6.4 kHz phase dispersion */ +const int16 ph_imp_mid[L_SUBFR] = +{ + 24098, 10460, -5263, -763, 2048, -927, 1753, -3323, + 2212, 652, -2146, 2487, -3539, 4109, -2107, -374, + -626, 4270, -5485, 2235, 1858, -2769, 744, 1140, + -763, -1615, 4060, -4574, 2982, -1163, 731, -1098, + 803, 167, -714, 606, -560, 639, 43, -1766, + 3228, -2782, 665, 763, 233, -2002, 1291, 1871, + -3470, 1032, 2710, -4040, 3624, -4214, 5292, -4270, + 1563, 108, -580, 1642, -2458, 957, 544, 2540 +}; + +/*---------------------------------------------------------------------------- +; 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 phase_dispersion( + int16 gain_code, /* (i) Q0 : gain of code */ + int16 gain_pit, /* (i) Q14 : gain of pitch */ + int16 code[], /* (i/o) : code vector */ + int16 mode, /* (i) : level, 0=hi, 1=lo, 2=off */ + int16 disp_mem[], /* (i/o) : static memory (size = 8) */ + int16 ScratchMem[] +) +{ + int16 i, j, state; + int16 *prev_gain_pit, *prev_gain_code, *prev_state; + int16 *code2 = ScratchMem; + + prev_state = disp_mem; + prev_gain_code = disp_mem + 1; + prev_gain_pit = disp_mem + 2; + + pv_memset((void *)code2, 0, (2*L_SUBFR)*sizeof(*code2)); + + + if (gain_pit < pitch_0_6) + { + state = 0; + } + else if (gain_pit < pitch_0_9) + { + state = 1; + } + else + { + state = 2; + } + + for (i = 5; i > 0; i--) + { + prev_gain_pit[i] = prev_gain_pit[i - 1]; + } + prev_gain_pit[0] = gain_pit; + + if (sub_int16(gain_code, *prev_gain_code) > shl_int16(*prev_gain_code, 1)) + { + /* onset */ + if (state < 2) + { + state++; + } + } + else + { + j = 0; + for (i = 0; i < 6; i++) + { + if (prev_gain_pit[i] < pitch_0_6) + { + j++; + } + } + + if (j > 2) + { + state = 0; + } + if (state > *prev_state + 1) + { + state--; + } + } + + *prev_gain_code = gain_code; + *prev_state = state; + + /* circular convolution */ + + state += mode; /* level of dispersion */ + + if (state == 0) + { + for (i = 0; i < L_SUBFR; i++) + { + if (code[i] != 0) + { + for (j = 0; j < L_SUBFR; j++) + { + code2[i + j] = add_int16(code2[i + j], mult_int16_r(code[i], ph_imp_low[j])); + } + } + } + } + else if (state == 1) + { + for (i = 0; i < L_SUBFR; i++) + { + if (code[i] != 0) + { + for (j = 0; j < L_SUBFR; j++) + { + code2[i + j] = add_int16(code2[i + j], mult_int16_r(code[i], ph_imp_mid[j])); + } + } + } + } + if (state < 2) + { + for (i = 0; i < L_SUBFR; i++) + { + code[i] = add_int16(code2[i], code2[i + L_SUBFR]); + } + } + return; +} + |