| /* ------------------------------------------------------------------ |
| * 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: dec_acelp_4p_in_64.cpp |
| |
| Date: 05/08/2007 |
| |
| ------------------------------------------------------------------------------ |
| REVISION HISTORY |
| |
| |
| Description: |
| |
| ------------------------------------------------------------------------------ |
| INPUT AND OUTPUT DEFINITIONS |
| |
| int16 index[], (i) : index (20): 5+5+5+5 = 20 bits. |
| (i) : index (36): 9+9+9+9 = 36 bits. |
| (i) : index (44): 13+9+13+9 = 44 bits. |
| (i) : index (52): 13+13+13+13 = 52 bits. |
| (i) : index (64): 2+2+2+2+14+14+14+14 = 64 bits. |
| (i) : index (72): 10+2+10+2+10+14+10+14 = 72 bits. |
| (i) : index (88): 11+11+11+11+11+11+11+11 = 88 bits. |
| int16 nbbits, (i) : 20, 36, 44, 52, 64, 72 or 88 bits |
| int16 code[] (o) Q9: algebraic (fixed) codebook excitation |
| |
| ------------------------------------------------------------------------------ |
| FUNCTION DESCRIPTION |
| |
| 20, 36, 44, 52, 64, 72, 88 bits algebraic codebook decoder. |
| 4 tracks x 16 positions per track = 64 samples. |
| |
| 20 bits --> 4 pulses in a frame of 64 samples. |
| 36 bits --> 8 pulses in a frame of 64 samples. |
| 44 bits --> 10 pulses in a frame of 64 samples. |
| 52 bits --> 12 pulses in a frame of 64 samples. |
| 64 bits --> 16 pulses in a frame of 64 samples. |
| 72 bits --> 18 pulses in a frame of 64 samples. |
| 88 bits --> 24 pulses in a frame of 64 samples. |
| |
| All pulses can have two (2) possible amplitudes: +1 or -1. |
| Each pulse can have sixteen (16) possible positions. |
| |
| ------------------------------------------------------------------------------ |
| 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" |
| |
| #include "q_pulse.h" |
| |
| /*---------------------------------------------------------------------------- |
| ; MACROS |
| ; Define module specific macros here |
| ----------------------------------------------------------------------------*/ |
| |
| |
| /*---------------------------------------------------------------------------- |
| ; DEFINES |
| ; Include all pre-processor statements here. Include conditional |
| ; compile variables also. |
| ----------------------------------------------------------------------------*/ |
| #define L_CODE 64 /* codevector length */ |
| #define NB_TRACK 4 /* number of track */ |
| #define NB_POS 16 /* number of position */ |
| |
| /*---------------------------------------------------------------------------- |
| ; LOCAL FUNCTION DEFINITIONS |
| ; Function Prototype declaration |
| ----------------------------------------------------------------------------*/ |
| #ifdef __cplusplus |
| extern "C" |
| { |
| #endif |
| |
| void add_pulses(int16 pos[], int16 nb_pulse, int16 track, int16 code[]); |
| |
| #ifdef __cplusplus |
| } |
| #endif |
| |
| /*---------------------------------------------------------------------------- |
| ; 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 dec_acelp_4p_in_64( |
| int16 index[], /* (i) : index (20): 5+5+5+5 = 20 bits. */ |
| /* (i) : index (36): 9+9+9+9 = 36 bits. */ |
| /* (i) : index (44): 13+9+13+9 = 44 bits. */ |
| /* (i) : index (52): 13+13+13+13 = 52 bits. */ |
| /* (i) : index (64): 2+2+2+2+14+14+14+14 = 64 bits. */ |
| /* (i) : index (72): 10+2+10+2+10+14+10+14 = 72 bits. */ |
| /* (i) : index (88): 11+11+11+11+11+11+11+11 = 88 bits. */ |
| int16 nbbits, /* (i) : 20, 36, 44, 52, 64, 72 or 88 bits */ |
| int16 code[] /* (o) Q9: algebraic (fixed) codebook excitation */ |
| ) |
| { |
| int16 k, pos[6]; |
| int32 L_index; |
| pv_memset(code, 0, L_CODE*sizeof(*code)); |
| |
| /* decode the positions and signs of pulses and build the codeword */ |
| |
| |
| switch (nbbits) |
| { |
| case 20: |
| for (k = 0; k < NB_TRACK; k++) |
| { |
| L_index = index[k]; |
| dec_1p_N1(L_index, 4, 0, pos); |
| add_pulses(pos, 1, k, code); |
| } |
| break; |
| |
| case 36: |
| for (k = 0; k < NB_TRACK; k++) |
| { |
| L_index = index[k]; |
| dec_2p_2N1(L_index, 4, 0, pos); |
| add_pulses(pos, 2, k, code); |
| } |
| break; |
| case 44: |
| for (k = 0; k < NB_TRACK - 2; k++) |
| { |
| L_index = index[k]; |
| dec_3p_3N1(L_index, 4, 0, pos); |
| add_pulses(pos, 3, k, code); |
| } |
| for (k = 2; k < NB_TRACK; k++) |
| { |
| L_index = index[k]; |
| dec_2p_2N1(L_index, 4, 0, pos); |
| add_pulses(pos, 2, k, code); |
| } |
| break; |
| case 52: |
| for (k = 0; k < NB_TRACK; k++) |
| { |
| L_index = index[k]; |
| dec_3p_3N1(L_index, 4, 0, pos); |
| add_pulses(pos, 3, k, code); |
| } |
| break; |
| case 64: |
| for (k = 0; k < NB_TRACK; k++) |
| { |
| L_index = ((int32)index[k] << 14) + index[k + NB_TRACK]; |
| dec_4p_4N(L_index, 4, 0, pos); |
| add_pulses(pos, 4, k, code); |
| } |
| break; |
| case 72: |
| for (k = 0; k < NB_TRACK - 2; k++) |
| { |
| L_index = ((int32)index[k] << 10) + index[k + NB_TRACK]; |
| dec_5p_5N(L_index, 4, 0, pos); |
| add_pulses(pos, 5, k, code); |
| } |
| for (k = 2; k < NB_TRACK; k++) |
| { |
| L_index = ((int32)index[k] << 14) + index[k + NB_TRACK]; |
| dec_4p_4N(L_index, 4, 0, pos); |
| add_pulses(pos, 4, k, code); |
| } |
| break; |
| case 88: |
| for (k = 0; k < NB_TRACK; k++) |
| { |
| L_index = ((int32)index[k] << 11) + index[k + NB_TRACK]; |
| dec_6p_6N_2(L_index, 4, 0, pos); |
| add_pulses(pos, 6, k, code); |
| } |
| default: |
| break; |
| } |
| |
| |
| } |
| |
| |
| |
| void add_pulses(int16 pos[], int16 nb_pulse, int16 track, int16 code[]) |
| { |
| int16 i, k; |
| |
| for (k = 0; k < nb_pulse; k++) |
| { |
| /* i = ((pos[k] & (NB_POS-1))*NB_TRACK) + track; */ |
| i = ((pos[k] & (NB_POS - 1)) << 2) + track; |
| |
| if ((pos[k] & NB_POS) == 0) |
| { |
| code[i] += 512; |
| } |
| else |
| { |
| code[i] -= 512; |
| } |
| } |
| |
| } |
