1
2/* -----------------------------------------------------------------------------------------------------------
3Software License for The Fraunhofer FDK AAC Codec Library for Android
4
5© Copyright  1995 - 2012 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.
6  All rights reserved.
7
8 1.    INTRODUCTION
9The Fraunhofer FDK AAC Codec Library for Android ("FDK AAC Codec") is software that implements
10the MPEG Advanced Audio Coding ("AAC") encoding and decoding scheme for digital audio.
11This FDK AAC Codec software is intended to be used on a wide variety of Android devices.
12
13AAC's HE-AAC and HE-AAC v2 versions are regarded as today's most efficient general perceptual
14audio codecs. AAC-ELD is considered the best-performing full-bandwidth communications codec by
15independent studies and is widely deployed. AAC has been standardized by ISO and IEC as part
16of the MPEG specifications.
17
18Patent licenses for necessary patent claims for the FDK AAC Codec (including those of Fraunhofer)
19may be obtained through Via Licensing (www.vialicensing.com) or through the respective patent owners
20individually for the purpose of encoding or decoding bit streams in products that are compliant with
21the ISO/IEC MPEG audio standards. Please note that most manufacturers of Android devices already license
22these patent claims through Via Licensing or directly from the patent owners, and therefore FDK AAC Codec
23software may already be covered under those patent licenses when it is used for those licensed purposes only.
24
25Commercially-licensed AAC software libraries, including floating-point versions with enhanced sound quality,
26are also available from Fraunhofer. Users are encouraged to check the Fraunhofer website for additional
27applications information and documentation.
28
292.    COPYRIGHT LICENSE
30
31Redistribution and use in source and binary forms, with or without modification, are permitted without
32payment of copyright license fees provided that you satisfy the following conditions:
33
34You must retain the complete text of this software license in redistributions of the FDK AAC Codec or
35your modifications thereto in source code form.
36
37You must retain the complete text of this software license in the documentation and/or other materials
38provided with redistributions of the FDK AAC Codec or your modifications thereto in binary form.
39You must make available free of charge copies of the complete source code of the FDK AAC Codec and your
40modifications thereto to recipients of copies in binary form.
41
42The name of Fraunhofer may not be used to endorse or promote products derived from this library without
43prior written permission.
44
45You may not charge copyright license fees for anyone to use, copy or distribute the FDK AAC Codec
46software or your modifications thereto.
47
48Your modified versions of the FDK AAC Codec must carry prominent notices stating that you changed the software
49and the date of any change. For modified versions of the FDK AAC Codec, the term
50"Fraunhofer FDK AAC Codec Library for Android" must be replaced by the term
51"Third-Party Modified Version of the Fraunhofer FDK AAC Codec Library for Android."
52
533.    NO PATENT LICENSE
54
55NO EXPRESS OR IMPLIED LICENSES TO ANY PATENT CLAIMS, including without limitation the patents of Fraunhofer,
56ARE GRANTED BY THIS SOFTWARE LICENSE. Fraunhofer provides no warranty of patent non-infringement with
57respect to this software.
58
59You may use this FDK AAC Codec software or modifications thereto only for purposes that are authorized
60by appropriate patent licenses.
61
624.    DISCLAIMER
63
64This FDK AAC Codec software is provided by Fraunhofer on behalf of the copyright holders and contributors
65"AS IS" and WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, including but not limited to the implied warranties
66of merchantability and fitness for a particular purpose. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
67CONTRIBUTORS BE LIABLE for any direct, indirect, incidental, special, exemplary, or consequential damages,
68including but not limited to procurement of substitute goods or services; loss of use, data, or profits,
69or business interruption, however caused and on any theory of liability, whether in contract, strict
70liability, or tort (including negligence), arising in any way out of the use of this software, even if
71advised of the possibility of such damage.
72
735.    CONTACT INFORMATION
74
75Fraunhofer Institute for Integrated Circuits IIS
76Attention: Audio and Multimedia Departments - FDK AAC LL
77Am Wolfsmantel 33
7891058 Erlangen, Germany
79
80www.iis.fraunhofer.de/amm
81amm-info@iis.fraunhofer.de
82----------------------------------------------------------------------------------------------------------- */
83
84/*!
85  \file
86  \brief  Envelope calculation prototypes
87*/
88#ifndef __ENV_CALC_H
89#define __ENV_CALC_H
90
91#include "sbrdecoder.h"
92#include "env_extr.h"  /* for HANDLE_SBR_HEADER_DATA */
93#include "sbr_scale.h"
94
95
96typedef struct
97{
98  FIXP_DBL  filtBuffer[MAX_FREQ_COEFFS];          /*!< previous gains (required for smoothing) */
99  FIXP_DBL  filtBufferNoise[MAX_FREQ_COEFFS];     /*!< previous noise levels (required for smoothing) */
100  SCHAR     filtBuffer_e[MAX_FREQ_COEFFS];        /*!< Exponents of previous gains */
101  SCHAR     filtBufferNoise_e;                    /*!< Common exponent of previous noise levels */
102
103  int startUp;               /*!< flag to signal initial conditions in buffers */
104  int phaseIndex;            /*!< Index for randomPase array */
105  int prevTranEnv;           /*!< The transient envelope of the previous frame. */
106
107  int harmFlagsPrev[(MAX_FREQ_COEFFS+15)/16];
108  /*!< Words with 16 flags each indicating where a sine was added in the previous frame.*/
109  UCHAR harmIndex;            /*!< Current phase of synthetic sine */
110
111}
112SBR_CALCULATE_ENVELOPE;
113
114typedef SBR_CALCULATE_ENVELOPE *HANDLE_SBR_CALCULATE_ENVELOPE;
115
116
117
118void
119calculateSbrEnvelope (QMF_SCALE_FACTOR  *sbrScaleFactor,
120                      HANDLE_SBR_CALCULATE_ENVELOPE h_sbr_cal_env,
121                      HANDLE_SBR_HEADER_DATA hHeaderData,
122                      HANDLE_SBR_FRAME_DATA hFrameData,
123                      FIXP_DBL **analysBufferReal,
124                      FIXP_DBL **analysBufferImag,                 /*!< Imag part of subband samples to be processed */
125                      const int useLP,
126                      FIXP_DBL *degreeAlias,                       /*!< Estimated aliasing for each QMF channel */
127                      const UINT flags,
128                      const int frameErrorFlag
129                      );
130
131SBR_ERROR
132createSbrEnvelopeCalc (HANDLE_SBR_CALCULATE_ENVELOPE hSbrCalculateEnvelope,
133                       HANDLE_SBR_HEADER_DATA hHeaderData,
134                       const int chan,
135                       const UINT flags);
136
137int
138deleteSbrEnvelopeCalc (HANDLE_SBR_CALCULATE_ENVELOPE hSbrCalculateEnvelope);
139
140void
141resetSbrEnvelopeCalc (HANDLE_SBR_CALCULATE_ENVELOPE hCalEnv);
142
143SBR_ERROR
144ResetLimiterBands ( UCHAR *limiterBandTable,
145                    UCHAR *noLimiterBands,
146                    UCHAR *freqBandTable,
147                    int noFreqBands,
148                    const PATCH_PARAM *patchParam,
149                    int noPatches,
150                    int limiterBands);
151
152void rescaleSubbandSamples( FIXP_DBL ** re,
153                            FIXP_DBL ** im,
154                            int lowSubband, int noSubbands,
155                            int start_pos,  int next_pos,
156                            int shift);
157
158FIXP_DBL maxSubbandSample( FIXP_DBL ** analysBufferReal_m,
159                           FIXP_DBL ** analysBufferImag_m,
160                           int lowSubband,
161                           int highSubband,
162                           int start_pos,
163                           int stop_pos);
164
165#endif // __ENV_CALC_H
166