1 /* -----------------------------------------------------------------------------
2 Software License for The Fraunhofer FDK AAC Codec Library for Android
3
4 © Copyright 1995 - 2019 Fraunhofer-Gesellschaft zur Förderung der angewandten
5 Forschung e.V. All rights reserved.
6
7 1. INTRODUCTION
8 The Fraunhofer FDK AAC Codec Library for Android ("FDK AAC Codec") is software
9 that implements the MPEG Advanced Audio Coding ("AAC") encoding and decoding
10 scheme for digital audio. This FDK AAC Codec software is intended to be used on
11 a wide variety of Android devices.
12
13 AAC's HE-AAC and HE-AAC v2 versions are regarded as today's most efficient
14 general perceptual audio codecs. AAC-ELD is considered the best-performing
15 full-bandwidth communications codec by independent studies and is widely
16 deployed. AAC has been standardized by ISO and IEC as part of the MPEG
17 specifications.
18
19 Patent licenses for necessary patent claims for the FDK AAC Codec (including
20 those of Fraunhofer) may be obtained through Via Licensing
21 (www.vialicensing.com) or through the respective patent owners individually for
22 the purpose of encoding or decoding bit streams in products that are compliant
23 with the ISO/IEC MPEG audio standards. Please note that most manufacturers of
24 Android devices already license these patent claims through Via Licensing or
25 directly from the patent owners, and therefore FDK AAC Codec software may
26 already be covered under those patent licenses when it is used for those
27 licensed purposes only.
28
29 Commercially-licensed AAC software libraries, including floating-point versions
30 with enhanced sound quality, are also available from Fraunhofer. Users are
31 encouraged to check the Fraunhofer website for additional applications
32 information and documentation.
33
34 2. COPYRIGHT LICENSE
35
36 Redistribution and use in source and binary forms, with or without modification,
37 are permitted without payment of copyright license fees provided that you
38 satisfy the following conditions:
39
40 You must retain the complete text of this software license in redistributions of
41 the FDK AAC Codec or your modifications thereto in source code form.
42
43 You must retain the complete text of this software license in the documentation
44 and/or other materials provided with redistributions of the FDK AAC Codec or
45 your modifications thereto in binary form. You must make available free of
46 charge copies of the complete source code of the FDK AAC Codec and your
47 modifications thereto to recipients of copies in binary form.
48
49 The name of Fraunhofer may not be used to endorse or promote products derived
50 from this library without prior written permission.
51
52 You may not charge copyright license fees for anyone to use, copy or distribute
53 the FDK AAC Codec software or your modifications thereto.
54
55 Your modified versions of the FDK AAC Codec must carry prominent notices stating
56 that you changed the software and the date of any change. For modified versions
57 of the FDK AAC Codec, the term "Fraunhofer FDK AAC Codec Library for Android"
58 must be replaced by the term "Third-Party Modified Version of the Fraunhofer FDK
59 AAC Codec Library for Android."
60
61 3. NO PATENT LICENSE
62
63 NO EXPRESS OR IMPLIED LICENSES TO ANY PATENT CLAIMS, including without
64 limitation the patents of Fraunhofer, ARE GRANTED BY THIS SOFTWARE LICENSE.
65 Fraunhofer provides no warranty of patent non-infringement with respect to this
66 software.
67
68 You may use this FDK AAC Codec software or modifications thereto only for
69 purposes that are authorized by appropriate patent licenses.
70
71 4. DISCLAIMER
72
73 This FDK AAC Codec software is provided by Fraunhofer on behalf of the copyright
74 holders and contributors "AS IS" and WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES,
75 including but not limited to the implied warranties of merchantability and
76 fitness for a particular purpose. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
77 CONTRIBUTORS BE LIABLE for any direct, indirect, incidental, special, exemplary,
78 or consequential damages, including but not limited to procurement of substitute
79 goods or services; loss of use, data, or profits, or business interruption,
80 however caused and on any theory of liability, whether in contract, strict
81 liability, or tort (including negligence), arising in any way out of the use of
82 this software, even if advised of the possibility of such damage.
83
84 5. CONTACT INFORMATION
85
86 Fraunhofer Institute for Integrated Circuits IIS
87 Attention: Audio and Multimedia Departments - FDK AAC LL
88 Am Wolfsmantel 33
89 91058 Erlangen, Germany
90
91 www.iis.fraunhofer.de/amm
92 amm-info@iis.fraunhofer.de
93 ----------------------------------------------------------------------------- */
94
95 /**************************** AAC decoder library ******************************
96
97 Author(s): Manuel Jander
98
99 Description: USAC Linear Prediction Domain coding
100
101 *******************************************************************************/
102
103 #ifndef USACDEC_LPD_H
104 #define USACDEC_LPD_H
105
106 #include "channelinfo.h"
107
108 #define OPTIMIZE_AVG_PERFORMANCE
109
110 /**
111 * \brief read a lpd_channel_stream.
112 * \param hBs a bit stream handle, where the lpd_channel_stream is located.
113 * \param pAacDecoderChannelInfo the channel context structure for storing read
114 * data.
115 * \param flags bit stream syntax flags.
116 * \return AAC_DECODER_ERROR error code.
117 */
118 AAC_DECODER_ERROR CLpdChannelStream_Read(
119 HANDLE_FDK_BITSTREAM hBs, CAacDecoderChannelInfo *pAacDecoderChannelInfo,
120 CAacDecoderStaticChannelInfo *pAacDecoderStaticChannelInfo,
121 const SamplingRateInfo *pSamplingRateInfo, UINT flags);
122
123 /**
124 * \brief decode one lpd_channel_stream and render the audio output.
125 * \param pAacDecoderChannelInfo struct holding the channel information to be
126 * rendered.
127 * \param pAacDecoderStaticChannelInfo struct holding the persistent channel
128 * information to be rendered.
129 * \param pSamplingRateInfo holds the sampling rate information
130 * \param elFlags holds the internal decoder flags
131 */
132 void CLpdChannelStream_Decode(
133 CAacDecoderChannelInfo *pAacDecoderChannelInfo,
134 CAacDecoderStaticChannelInfo *pAacDecoderStaticChannelInfo, UINT flags);
135
136 /**
137 * \brief generate time domain output signal for LPD channel streams
138 * \param pAacDecoderStaticChannelInfo
139 * \param pAacDecoderChannelInfo
140 * \param pTimeData pointer to output buffer
141 * \param samplesPerFrame amount of output samples
142 * \param pSamplingRateInfo holds the sampling rate information
143 * \param aacOutDataHeadroom headroom of the output time signal to prevent
144 * clipping
145 */
146 AAC_DECODER_ERROR CLpd_RenderTimeSignal(
147 CAacDecoderStaticChannelInfo *pAacDecoderStaticChannelInfo,
148 CAacDecoderChannelInfo *pAacDecoderChannelInfo, PCM_DEC *pTimeData,
149 INT samplesPerFrame, SamplingRateInfo *pSamplingRateInfo, UINT frameOk,
150 const INT aacOutDataHeadroom, UINT flags, UINT strmFlags);
151
CLpd_FAC_getLength(int fNotShortBlock,int fac_length_long)152 static inline INT CLpd_FAC_getLength(int fNotShortBlock, int fac_length_long) {
153 if (fNotShortBlock) {
154 return (fac_length_long);
155 } else {
156 return fac_length_long / 2;
157 }
158 }
159
160 void filtLP(const FIXP_DBL *syn, PCM_DEC *syn_out, FIXP_DBL *noise,
161 const FIXP_SGL *filt, const INT aacOutDataHeadroom, INT stop,
162 int len);
163
164 /**
165 * \brief perform a low-frequency pitch enhancement on time domain signal
166 * \param[in] syn pointer to time domain input signal
167 * \param[in] synFB pointer to time domain input signal
168 * \param[in] upsampling factor
169 * \param[in] T_sf array with past decoded pitch period values for each subframe
170 * \param[in] non_zero_gain_flags indicates whether pitch gains of past
171 * subframes are zero or not, msb -> [1 BPF_DELAY subfr][7 SYN_DELAY subfr][16
172 * new subfr] <- lsb
173 * \param[in] l_frame length of filtering, must be multiple of L_SUBFR
174 * \param[in] l_next length of allowed look ahead on syn[i], i < l_frame+l_next
175 * \param[out] synth_out pointer to time domain output signal
176 * \param[in] headroom of the output time signal to prevent clipping
177 * \param[in,out] mem_bpf pointer to filter memory (L_FILT+L_SUBFR)
178 */
179
180 void bass_pf_1sf_delay(FIXP_DBL syn[], const INT T_sf[], FIXP_DBL *pit_gain,
181 const int frame_length, const INT l_frame,
182 const INT l_next, PCM_DEC *synth_out,
183 const INT aacOutDataHeadroom, FIXP_DBL mem_bpf[]);
184
185 /**
186 * \brief random sign generator for FD and TCX noise filling
187 * \param[in,out] seed pointer to random seed
188 * \return if return value is zero use positive sign
189 * \Note: This code is also implemented as a copy in block.cpp, grep for
190 * "UsacRandomSign"
191 */
192 FDK_INLINE
UsacRandomSign(ULONG * seed)193 int UsacRandomSign(ULONG *seed) {
194 *seed = (ULONG)((UINT64)(*seed) * 69069 + 5);
195
196 return (int)((*seed) & 0x10000);
197 }
198
199 void CFdp_Reset(CAacDecoderStaticChannelInfo *pAacDecoderStaticChannelInfo);
200
201 #endif /* USACDEC_LPD_H */
202