1/* ------------------------------------------------------------------
2 * Copyright (C) 1998-2009 PacketVideo
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
13 * express or implied.
14 * See the License for the specific language governing permissions
15 * and limitations under the License.
16 * -------------------------------------------------------------------
17 */
18/****************************************************************************************
19Portions of this file are derived from the following 3GPP standard:
20
21    3GPP TS 26.173
22    ANSI-C code for the Adaptive Multi-Rate - Wideband (AMR-WB) speech codec
23    Available from http://www.3gpp.org
24
25(C) 2007, 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TTA, TTC)
26Permission to distribute, modify and use this file under the standard license
27terms listed above has been obtained from the copyright holder.
28****************************************************************************************/
29/*
30------------------------------------------------------------------------------
31
32
33
34 Filename: band_pass_6k_7k.cpp
35
36     Date: 05/08/2004
37
38------------------------------------------------------------------------------
39 REVISION HISTORY
40
41
42 Description:
43
44------------------------------------------------------------------------------
45 INPUT AND OUTPUT DEFINITIONS
46
47     int16 signal[],             input signal / output is divided by 16
48     int16 lg,                   lenght of signal
49     int16 mem[]                 in/out: memory (size=30)
50     int16 x[]                   scratch mem ( size= 60)
51
52------------------------------------------------------------------------------
53 FUNCTION DESCRIPTION
54
55   15th order band pass 6kHz to 7kHz FIR filter.
56
57   frequency:  4kHz   5kHz  5.5kHz  6kHz  6.5kHz 7kHz  7.5kHz  8kHz
58   dB loss:   -60dB  -45dB  -13dB   -3dB   0dB   -3dB  -13dB  -45dB
59
60
61------------------------------------------------------------------------------
62 REQUIREMENTS
63
64
65------------------------------------------------------------------------------
66 REFERENCES
67
68------------------------------------------------------------------------------
69 PSEUDO-CODE
70
71------------------------------------------------------------------------------
72*/
73
74
75/*----------------------------------------------------------------------------
76; INCLUDES
77----------------------------------------------------------------------------*/
78
79
80#include "pv_amr_wb_type_defs.h"
81#include "pvamrwbdecoder_basic_op.h"
82#include "pvamrwbdecoder_acelp.h"
83#include "pvamrwbdecoder_cnst.h"
84
85/*----------------------------------------------------------------------------
86; MACROS
87; Define module specific macros here
88----------------------------------------------------------------------------*/
89
90
91/*----------------------------------------------------------------------------
92; DEFINES
93; Include all pre-processor statements here. Include conditional
94; compile variables also.
95----------------------------------------------------------------------------*/
96
97#define L_FIR 30
98
99/*----------------------------------------------------------------------------
100; LOCAL FUNCTION DEFINITIONS
101; Function Prototype declaration
102----------------------------------------------------------------------------*/
103
104/*----------------------------------------------------------------------------
105; LOCAL STORE/BUFFER/POINTER DEFINITIONS
106; Variable declaration - defined here and used outside this module
107----------------------------------------------------------------------------*/
108
109/* filter coefficients (gain=4.0) */
110
111const int16 fir_6k_7k[L_FIR] =
112{
113    -32,     47,     32,    -27,
114    -369,   1122,  -1421,      0,
115    3798,  -8880,  12349, -10984,
116    3548,   7766, -18001,
117    22118,
118    -18001,   7766,   3548, -10984,
119    12349,  -8880,   3798,      0,
120    -1421,   1122,   -369,    -27,
121    32,     47
122};
123
124/*----------------------------------------------------------------------------
125; EXTERNAL FUNCTION REFERENCES
126; Declare functions defined elsewhere and referenced in this module
127----------------------------------------------------------------------------*/
128
129/*----------------------------------------------------------------------------
130; EXTERNAL GLOBAL STORE/BUFFER/POINTER REFERENCES
131; Declare variables used in this module but defined elsewhere
132----------------------------------------------------------------------------*/
133
134/*----------------------------------------------------------------------------
135; FUNCTION CODE
136----------------------------------------------------------------------------*/
137
138void band_pass_6k_7k_init(int16 mem[])         /* mem[30] */
139{
140    pv_memset((void *)mem, 0, L_FIR*sizeof(*mem));
141}
142
143
144/*----------------------------------------------------------------------------
145; FUNCTION CODE
146----------------------------------------------------------------------------*/
147
148
149void band_pass_6k_7k(
150    int16 signal[],                      /* input:  signal                  */
151    int16 lg,                            /* input:  length of input         */
152    int16 mem[],                         /* in/out: memory (size=30)        */
153    int16 x[]
154)
155{
156    int16 i, j;
157    int32 L_tmp1;
158    int32 L_tmp2;
159    int32 L_tmp3;
160    int32 L_tmp4;
161
162    int16 *pt_sign = signal;
163
164    pv_memcpy((void *)x, (void *)mem, L_FIR*sizeof(*x));
165
166
167    for (i = 0; i < lg >> 2; i++)
168    {
169
170        x[(i<<2) + L_FIR    ] = *(pt_sign) >> 2;        /* gain of filter = 4 */
171        x[(i<<2) + L_FIR + 1] = *(pt_sign + 1) >> 2;    /* gain of filter = 4 */
172        x[(i<<2) + L_FIR + 2] = *(pt_sign + 2) >> 2;    /* gain of filter = 4 */
173        x[(i<<2) + L_FIR + 3] = *(pt_sign + 3) >> 2;    /* gain of filter = 4 */
174
175        L_tmp1 = 0x00004000;
176        L_tmp2 = 0x00004000;
177        L_tmp3 = 0x00004000;
178        L_tmp4 = 0x00004000;
179
180        L_tmp1 -= ((int32)x[(i<<2)+L_FIR  ] << 5);
181        L_tmp2 -= ((int32)x[(i<<2)+L_FIR+1] << 5);
182        L_tmp3 -= ((int32)x[(i<<2)+L_FIR+2] << 5);
183        L_tmp4 -= ((int32)x[(i<<2)+L_FIR+3] << 5);
184
185        L_tmp1 -= ((int32)x[(i<<2)] << 5);
186        L_tmp2 -= ((int32)x[(i<<2)+1] << 5);
187        L_tmp3 -= ((int32)x[(i<<2)+2] << 5);
188        L_tmp4 -= ((int32)x[(i<<2)+3] << 5);
189
190
191        for (j = 1; j < L_FIR - 1; j += 4)
192        {
193            int16 tmp1 = x[(i<<2)+j  ];
194            int16 tmp2 = x[(i<<2)+j+1];
195            int16 tmp3 = x[(i<<2)+j+2];
196
197            L_tmp1 = fxp_mac_16by16(tmp1, fir_6k_7k[j  ], L_tmp1);
198            L_tmp2 = fxp_mac_16by16(tmp2, fir_6k_7k[j  ], L_tmp2);
199            L_tmp1 = fxp_mac_16by16(tmp2, fir_6k_7k[j+1], L_tmp1);
200            L_tmp2 = fxp_mac_16by16(tmp3, fir_6k_7k[j+1], L_tmp2);
201            L_tmp3 = fxp_mac_16by16(tmp3, fir_6k_7k[j  ], L_tmp3);
202            L_tmp1 = fxp_mac_16by16(tmp3, fir_6k_7k[j+2], L_tmp1);
203
204            tmp1 = x[(i<<2)+j+3];
205            tmp2 = x[(i<<2)+j+4];
206
207            L_tmp2 = fxp_mac_16by16(tmp1, fir_6k_7k[j+2], L_tmp2);
208            L_tmp4 = fxp_mac_16by16(tmp1, fir_6k_7k[j  ], L_tmp4);
209            L_tmp3 = fxp_mac_16by16(tmp1, fir_6k_7k[j+1], L_tmp3);
210            L_tmp1 = fxp_mac_16by16(tmp1, fir_6k_7k[j+3], L_tmp1);
211            L_tmp2 = fxp_mac_16by16(tmp2, fir_6k_7k[j+3], L_tmp2);
212            L_tmp4 = fxp_mac_16by16(tmp2, fir_6k_7k[j+1], L_tmp4);
213            L_tmp3 = fxp_mac_16by16(tmp2, fir_6k_7k[j+2], L_tmp3);
214
215            tmp1 = x[(i<<2)+j+5];
216            tmp2 = x[(i<<2)+j+6];
217
218            L_tmp4 = fxp_mac_16by16(tmp1, fir_6k_7k[j+2], L_tmp4);
219            L_tmp3 = fxp_mac_16by16(tmp1, fir_6k_7k[j+3], L_tmp3);
220            L_tmp4 = fxp_mac_16by16(tmp2, fir_6k_7k[j+3], L_tmp4);
221
222        }
223
224        L_tmp1 = fxp_mac_16by16(x[(i<<2)+j  ], fir_6k_7k[L_FIR-1  ], L_tmp1);
225        L_tmp2 = fxp_mac_16by16(x[(i<<2)+j+1], fir_6k_7k[L_FIR-1  ], L_tmp2);
226        L_tmp3 = fxp_mac_16by16(x[(i<<2)+j+2], fir_6k_7k[L_FIR-1  ], L_tmp3);
227        L_tmp4 = fxp_mac_16by16(x[(i<<2)+j+3], fir_6k_7k[L_FIR-1  ], L_tmp4);
228
229
230        *(pt_sign++) = (int16)(L_tmp1 >> 15);
231        *(pt_sign++) = (int16)(L_tmp2 >> 15);
232        *(pt_sign++) = (int16)(L_tmp3 >> 15);
233        *(pt_sign++) = (int16)(L_tmp4 >> 15);
234
235    }
236
237    pv_memcpy((void *)mem, (void *)(x + lg), L_FIR*sizeof(*mem));
238
239}
240
241