/src/aac/libAACdec/src/FDK_delay.cpp
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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): Matthias Hildenbrand |
98 | | |
99 | | Description: |
100 | | |
101 | | *******************************************************************************/ |
102 | | |
103 | | #include "FDK_delay.h" |
104 | | |
105 | | #include "genericStds.h" |
106 | | |
107 | | #define MAX_FRAME_LENGTH (1024) |
108 | | |
109 | | INT FDK_Delay_Create(FDK_SignalDelay* data, const USHORT delay, |
110 | 829 | const UCHAR num_channels) { |
111 | 829 | FDK_ASSERT(data != NULL); |
112 | 829 | FDK_ASSERT(num_channels > 0); |
113 | | |
114 | 829 | if (delay > 0) { |
115 | 829 | data->delay_line = |
116 | 829 | (PCM_DEC*)FDKcalloc(num_channels * delay, sizeof(PCM_DEC)); |
117 | 829 | if (data->delay_line == NULL) { |
118 | 0 | return -1; |
119 | 0 | } |
120 | 829 | } else { |
121 | 0 | data->delay_line = NULL; |
122 | 0 | } |
123 | 829 | data->num_channels = num_channels; |
124 | 829 | data->delay = delay; |
125 | | |
126 | 829 | return 0; |
127 | 829 | } |
128 | | |
129 | | void FDK_Delay_Apply(FDK_SignalDelay* data, PCM_DEC* time_buffer, |
130 | 486k | const UINT frame_length, const UCHAR channel) { |
131 | 486k | FDK_ASSERT(data != NULL); |
132 | | |
133 | 486k | if (data->delay > 0) { |
134 | 451 | C_ALLOC_SCRATCH_START(tmp, PCM_DEC, MAX_FRAME_LENGTH) |
135 | 451 | FDK_ASSERT(frame_length <= MAX_FRAME_LENGTH); |
136 | 451 | FDK_ASSERT(channel < data->num_channels); |
137 | 451 | FDK_ASSERT(time_buffer != NULL); |
138 | 451 | if (frame_length >= data->delay) { |
139 | 175 | FDKmemcpy(tmp, &time_buffer[frame_length - data->delay], |
140 | 175 | data->delay * sizeof(PCM_DEC)); |
141 | 175 | FDKmemmove(&time_buffer[data->delay], &time_buffer[0], |
142 | 175 | (frame_length - data->delay) * sizeof(PCM_DEC)); |
143 | 175 | FDKmemcpy(&time_buffer[0], &data->delay_line[channel * data->delay], |
144 | 175 | data->delay * sizeof(PCM_DEC)); |
145 | 175 | FDKmemcpy(&data->delay_line[channel * data->delay], tmp, |
146 | 175 | data->delay * sizeof(PCM_DEC)); |
147 | 276 | } else { |
148 | 276 | FDKmemcpy(tmp, &time_buffer[0], frame_length * sizeof(PCM_DEC)); |
149 | 276 | FDKmemcpy(&time_buffer[0], &data->delay_line[channel * data->delay], |
150 | 276 | frame_length * sizeof(PCM_DEC)); |
151 | 276 | FDKmemcpy(&data->delay_line[channel * data->delay], |
152 | 276 | &data->delay_line[channel * data->delay + frame_length], |
153 | 276 | (data->delay - frame_length) * sizeof(PCM_DEC)); |
154 | 276 | FDKmemcpy(&data->delay_line[channel * data->delay + |
155 | 276 | (data->delay - frame_length)], |
156 | 276 | tmp, frame_length * sizeof(PCM_DEC)); |
157 | 276 | } |
158 | 451 | C_ALLOC_SCRATCH_END(tmp, PCM_DEC, MAX_FRAME_LENGTH) |
159 | 451 | } |
160 | | |
161 | 0 | return; |
162 | 486k | } |
163 | | |
164 | 155k | void FDK_Delay_Destroy(FDK_SignalDelay* data) { |
165 | 155k | if (data->delay_line != NULL) { |
166 | 829 | FDKfree(data->delay_line); |
167 | 829 | } |
168 | 155k | data->delay_line = NULL; |
169 | 155k | data->delay = 0; |
170 | 155k | data->num_channels = 0; |
171 | | |
172 | 155k | return; |
173 | 155k | } |