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
20 Filename: sbr_decode_envelope.c
21
22------------------------------------------------------------------------------
23 REVISION HISTORY
24
25
26 Who:                                   Date: MM/DD/YYYY
27 Description:
28
29------------------------------------------------------------------------------
30 INPUT AND OUTPUT DEFINITIONS
31
32
33
34------------------------------------------------------------------------------
35 FUNCTION DESCRIPTION
36
37
38------------------------------------------------------------------------------
39 REQUIREMENTS
40
41
42------------------------------------------------------------------------------
43 REFERENCES
44
45SC 29 Software Copyright Licencing Disclaimer:
46
47This software module was originally developed by
48  Coding Technologies
49
50and edited by
51  -
52
53in the course of development of the ISO/IEC 13818-7 and ISO/IEC 14496-3
54standards for reference purposes and its performance may not have been
55optimized. This software module is an implementation of one or more tools as
56specified by the ISO/IEC 13818-7 and ISO/IEC 14496-3 standards.
57ISO/IEC gives users free license to this software module or modifications
58thereof for use in products claiming conformance to audiovisual and
59image-coding related ITU Recommendations and/or ISO/IEC International
60Standards. ISO/IEC gives users the same free license to this software module or
61modifications thereof for research purposes and further ISO/IEC standardisation.
62Those intending to use this software module in products are advised that its
63use may infringe existing patents. ISO/IEC have no liability for use of this
64software module or modifications thereof. Copyright is not released for
65products that do not conform to audiovisual and image-coding related ITU
66Recommendations and/or ISO/IEC International Standards.
67The original developer retains full right to modify and use the code for its
68own purpose, assign or donate the code to a third party and to inhibit third
69parties from using the code for products that do not conform to audiovisual and
70image-coding related ITU Recommendations and/or ISO/IEC International Standards.
71This copyright notice must be included in all copies or derivative works.
72Copyright (c) ISO/IEC 2002.
73
74------------------------------------------------------------------------------
75 PSEUDO-CODE
76
77------------------------------------------------------------------------------
78*/
79
80
81/*----------------------------------------------------------------------------
82; INCLUDES
83----------------------------------------------------------------------------*/
84
85#ifdef AAC_PLUS
86
87
88#include    "sbr_decode_envelope.h"
89#include    "sbr_constants.h"
90
91/*----------------------------------------------------------------------------
92; MACROS
93; Define module specific macros here
94----------------------------------------------------------------------------*/
95
96
97/*----------------------------------------------------------------------------
98; DEFINES
99; Include all pre-processor statements here. Include conditional
100; compile variables also.
101----------------------------------------------------------------------------*/
102
103/*----------------------------------------------------------------------------
104; LOCAL FUNCTION DEFINITIONS
105; Function Prototype declaration
106----------------------------------------------------------------------------*/
107void mapLowResEnergyVal(
108    Int32  currVal,
109    Int32 *prevData,
110    Int32 offset,
111    Int32 index,
112    Int32 res);
113
114Int32 indexLow2High(Int32 offset,
115                    Int32 index,
116                    Int32 res);
117
118/*----------------------------------------------------------------------------
119; LOCAL STORE/BUFFER/POINTER DEFINITIONS
120; Variable declaration - defined here and used outside this module
121----------------------------------------------------------------------------*/
122
123/*----------------------------------------------------------------------------
124; EXTERNAL FUNCTION REFERENCES
125; Declare functions defined elsewhere and referenced in this module
126----------------------------------------------------------------------------*/
127
128/*----------------------------------------------------------------------------
129; EXTERNAL GLOBAL STORE/BUFFER/POINTER REFERENCES
130; Declare variables used in this module but defined elsewhere
131----------------------------------------------------------------------------*/
132
133/*----------------------------------------------------------------------------
134; FUNCTION CODE
135----------------------------------------------------------------------------*/
136
137
138void sbr_decode_envelope(SBR_FRAME_DATA * hFrameData)
139
140{
141    Int32 i;
142    Int32 no_of_bands;
143    Int32 band;
144    Int32 freqRes;
145    Int32 *iEnvelope    = hFrameData->iEnvelope_man;
146    Int32 *sfb_nrg_prev = hFrameData->sfb_nrg_prev_man;
147
148    Int32  offset       = hFrameData->offset;
149    Int32 *nSfb         = hFrameData->nSfb;
150    Int32 *domain_vec   = hFrameData->domain_vec1;
151    Int32 *frameInfo    = hFrameData->frameInfo;
152
153
154
155    for (i = 0; i < frameInfo[0]; i++)
156    {
157        freqRes = frameInfo[frameInfo[0] + i + 2];
158        no_of_bands = nSfb[freqRes];
159
160        if (domain_vec[i] == 0)
161        {
162            mapLowResEnergyVal(*iEnvelope,
163                               sfb_nrg_prev,
164                               offset,
165                               0,
166                               freqRes);
167            iEnvelope++;
168
169            for (band = 1; band < no_of_bands; band++)
170            {
171                *iEnvelope +=  *(iEnvelope - 1);
172
173                mapLowResEnergyVal(*iEnvelope,
174                                   sfb_nrg_prev,
175                                   offset,
176                                   band,
177                                   freqRes);
178                iEnvelope++;
179            }
180        }
181        else
182        {
183            for (band = 0; band < no_of_bands; band++)
184            {
185                *iEnvelope +=  sfb_nrg_prev[ indexLow2High(offset, band, freqRes)];
186
187                mapLowResEnergyVal(*iEnvelope,
188                                   sfb_nrg_prev,
189                                   offset,
190                                   band,
191                                   freqRes);
192                iEnvelope++;
193            }
194        }
195    }
196}
197
198
199
200void mapLowResEnergyVal(
201    Int32  currVal,
202    Int32 *prevData,
203    Int32  offset,
204    Int32  index,
205    Int32  res)
206{
207    Int32 tmp;
208
209    if (res == LO)
210    {
211        if (offset >= 0)
212        {
213            if (index < offset)
214            {
215                prevData[index] = currVal;
216            }
217            else
218            {
219                tmp = (index << 1) - offset;
220                prevData[tmp    ] = currVal;
221                prevData[tmp +1 ] = currVal;
222            }
223        }
224        else
225        {
226            offset = -offset;
227            if (index < offset)
228            {
229                tmp = (index << 1) + index;
230                prevData[tmp    ] = currVal;
231                prevData[tmp + 1] = currVal;
232                prevData[tmp + 2] = currVal;
233            }
234            else
235            {
236                tmp = (index << 1) + offset;
237                prevData[tmp    ] = currVal;
238                prevData[tmp + 1] = currVal;
239            }
240        }
241    }
242    else
243    {
244        prevData[index] = currVal;
245    }
246}
247
248
249Int32 indexLow2High(Int32 offset,
250                    Int32 index,
251                    Int32 res)
252{
253    if (res == LO)
254    {
255        if (offset >= 0)
256        {
257            if (index < offset)
258            {
259                return(index);
260            }
261            else
262            {
263                return((index << 1) - offset);
264            }
265        }
266        else
267        {
268            offset = -offset;
269            if (index < offset)
270            {
271                return((index << 1) + index);
272            }
273            else
274            {
275                return((index << 1) + offset);
276            }
277        }
278    }
279    else
280    {
281        return(index);
282    }
283}
284
285#endif
286
287