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 /****************************************************************************************
19 Portions 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)
26 Permission to distribute, modify and use this file under the standard license
27 terms 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
111 const 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
band_pass_6k_7k_init(int16 mem[])138 void 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
band_pass_6k_7k(int16 signal[],int16 lg,int16 mem[],int16 x[])149 void 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