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 26.073
22 ANSI-C code for the Adaptive Multi-Rate (AMR) speech codec
23 Available from http://www.3gpp.org
24
25 (C) 2004, 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 Pathname: ./audio/gsm-amr/c/src/d1035pf.c
35
36 Date: 04/14/2000
37
38 ------------------------------------------------------------------------------
39 REVISION HISTORY
40
41 Description: Updated template used to PV coding template. First attempt at
42 optimizing C code.
43
44 Description: Updated file per comments gathered from Phase 2/3 review.
45
46 Description: Synchronized file with UTMS version 3.2.0. Updated coding
47 template. Removed unnecessary include files.
48
49 Description: Removed inclusion of "gray.tab".
50
51 Description:
52
53 ------------------------------------------------------------------------------
54 */
55
56 /*----------------------------------------------------------------------------
57 ; INCLUDES
58 ----------------------------------------------------------------------------*/
59 #include "d1035pf.h"
60 #include "typedef.h"
61 #include "basic_op.h"
62 #include "cnst.h"
63
64 /*----------------------------------------------------------------------------
65 ; MACROS
66 ; Define module specific macros here
67 ----------------------------------------------------------------------------*/
68
69 /*----------------------------------------------------------------------------
70 ; DEFINES
71 ; Include all pre-processor statements here. Include conditional
72 ; compile variables also.
73 ----------------------------------------------------------------------------*/
74 #define NB_PULSE 10 /* number of pulses */
75
76 /*----------------------------------------------------------------------------
77 ; LOCAL FUNCTION DEFINITIONS
78 ; Function Prototype declaration
79 ----------------------------------------------------------------------------*/
80
81 /*----------------------------------------------------------------------------
82 ; LOCAL STORE/BUFFER/POINTER DEFINITIONS
83 ; Variable declaration - defined here and used outside this module
84 ----------------------------------------------------------------------------*/
85
86 /*
87 ------------------------------------------------------------------------------
88 FUNCTION NAME: dec_10i40_35bits
89 ------------------------------------------------------------------------------
90 INPUT AND OUTPUT DEFINITIONS
91
92 Inputs:
93 index = buffer containing index of 10 pulses; each element is
94 represented by sign+position
95 cod = buffer of algebraic (fixed) codebook excitation
96
97 Outputs:
98 cod buffer contains the new algebraic codebook excitation
99
100 Returns:
101 None
102
103 Global Variables Used:
104 dgray = gray decoding table
105
106 Local Variables Needed:
107 None
108
109 ------------------------------------------------------------------------------
110 FUNCTION DESCRIPTION
111
112 This function builds the innovative codevector from the received index of
113 algebraic codebook. See c1035pf.c for more details about the algebraic
114 codebook structure.
115
116 ------------------------------------------------------------------------------
117 REQUIREMENTS
118
119 None
120
121 ------------------------------------------------------------------------------
122 REFERENCES
123
124 d1035pf.c, UMTS GSM AMR speech codec, R99 - Version 3.2.0, March 2, 2001
125
126 ------------------------------------------------------------------------------
127 PSEUDO-CODE
128
129 void dec_10i40_35bits (
130 Word16 index[], // (i) : index of 10 pulses (sign+position)
131 Word16 cod[] // (o) : algebraic (fixed) codebook excitation
132 )
133 {
134 Word16 i, j, pos1, pos2, sign, tmp;
135
136 for (i = 0; i < L_CODE; i++)
137 {
138 cod[i] = 0;
139 }
140
141 // decode the positions and signs of pulses and build the codeword
142
143 for (j = 0; j < NB_TRACK; j++)
144 {
145 // compute index i
146
147 tmp = index[j];
148 i = tmp & 7;
149 i = dgray[i];
150
151 i = extract_l (L_shr (L_mult (i, 5), 1));
152 pos1 = add (i, j); // position of pulse "j"
153
154 i = shr (tmp, 3) & 1;
155 if (i == 0)
156 {
157 sign = 4096; // +1.0
158 }
159 else
160 {
161 sign = -4096; // -1.0
162 }
163
164 cod[pos1] = sign;
165
166 // compute index i
167
168 i = index[add (j, 5)] & 7;
169 i = dgray[i];
170 i = extract_l (L_shr (L_mult (i, 5), 1));
171
172 pos2 = add (i, j); // position of pulse "j+5"
173
174 if (sub (pos2, pos1) < 0)
175 {
176 sign = negate (sign);
177 }
178 cod[pos2] = add (cod[pos2], sign);
179 }
180
181 return;
182 }
183
184 ------------------------------------------------------------------------------
185 RESOURCES USED [optional]
186
187 When the code is written for a specific target processor the
188 the resources used should be documented below.
189
190 HEAP MEMORY USED: x bytes
191
192 STACK MEMORY USED: x bytes
193
194 CLOCK CYCLES: (cycle count equation for this function) + (variable
195 used to represent cycle count for each subroutine
196 called)
197 where: (cycle count variable) = cycle count for [subroutine
198 name]
199
200 ------------------------------------------------------------------------------
201 CAUTION [optional]
202 [State any special notes, constraints or cautions for users of this function]
203
204 ------------------------------------------------------------------------------
205 */
206
dec_10i40_35bits(Word16 index[],Word16 cod[])207 void dec_10i40_35bits(
208 Word16 index[], /* (i) : index of 10 pulses (sign+position) */
209 Word16 cod[] /* (o) : algebraic (fixed) codebook excitation */
210 )
211 {
212 Word16 i, j, pos1, pos2;
213 Word16 sign, tmp;
214
215 for (i = 0; i < L_CODE; i++)
216 {
217 *(cod + i) = 0;
218 }
219
220 /* decode the positions and signs of pulses and build the codeword */
221
222 for (j = 0; j < NB_TRACK; j++)
223 {
224 /* compute index i */
225
226 tmp = *(index + j);
227 i = tmp & 7;
228 i = *(dgray + i);
229
230 i = (Word16)(i * 5);
231 pos1 = i + j; /* position of pulse "j" */
232
233 i = (tmp >> 3) & 1;
234
235 if (i == 0)
236 {
237 sign = 4096; /* +1.0 */
238 }
239 else
240 {
241 sign = -4096; /* -1.0 */
242 }
243
244 *(cod + pos1) = sign;
245
246 /* compute index i */
247
248 i = *(index + j + 5) & 7;
249 i = *(dgray + i);
250 i = (Word16)(i * 5);
251
252 pos2 = i + j; /* position of pulse "j+5" */
253
254
255 if (pos2 < pos1)
256 {
257 sign = negate(sign);
258 }
259 *(cod + pos2) += sign;
260 }
261
262 return;
263 }
264