1 /* -----------------------------------------------------------------------------
2 Software License for The Fraunhofer FDK AAC Codec Library for Android
3 
4 © Copyright  1995 - 2018 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 /******************* MPEG transport format encoder library *********************
96 
97    Author(s):
98 
99    Description: ADIF Transport Headers writing
100 
101 *******************************************************************************/
102 
103 #include "tpenc_adif.h"
104 
105 #include "tpenc_lib.h"
106 #include "tpenc_asc.h"
107 
108 int adifWrite_EncodeHeader(ADIF_INFO *adif, HANDLE_FDK_BITSTREAM hBs,
109                            INT adif_buffer_fullness) {
110   /* ADIF/PCE/ADTS definitions */
111   const char adifId[5] = "ADIF";
112   const int copyRightIdPresent = 0;
113   const int originalCopy = 0;
114   const int home = 0;
115   int err = 0;
116 
117   int i;
118 
119   INT totalBitRate = adif->bitRate;
120 
121   if (adif->headerWritten) return 0;
122 
123   /* Align inside PCE with respect to the first bit of the header */
124   UINT alignAnchor = FDKgetValidBits(hBs);
125 
126   /* Signal variable bitrate if buffer fullnes exceeds 20 bit */
127   adif->bVariableRate = (adif_buffer_fullness >= (INT)(0x1 << 20)) ? 1 : 0;
128 
129   FDKwriteBits(hBs, adifId[0], 8);
130   FDKwriteBits(hBs, adifId[1], 8);
131   FDKwriteBits(hBs, adifId[2], 8);
132   FDKwriteBits(hBs, adifId[3], 8);
133 
134   FDKwriteBits(hBs, copyRightIdPresent ? 1 : 0, 1);
135 
136   if (copyRightIdPresent) {
137     for (i = 0; i < 72; i++) {
138       FDKwriteBits(hBs, 0, 1);
139     }
140   }
141   FDKwriteBits(hBs, originalCopy ? 1 : 0, 1);
142   FDKwriteBits(hBs, home ? 1 : 0, 1);
143   FDKwriteBits(hBs, adif->bVariableRate ? 1 : 0, 1);
144   FDKwriteBits(hBs, totalBitRate, 23);
145 
146   /* we write only one PCE at the moment */
147   FDKwriteBits(hBs, 0, 4);
148 
149   if (!adif->bVariableRate) {
150     FDKwriteBits(hBs, adif_buffer_fullness, 20);
151   }
152   /* Write PCE */
153   transportEnc_writePCE(hBs, adif->cm, adif->samplingRate, adif->instanceTag,
154                         adif->profile, adif->matrixMixdownA,
155                         (adif->pseudoSurroundEnable) ? 1 : 0, alignAnchor);
156 
157   return err;
158 }
159 
160 int adifWrite_GetHeaderBits(ADIF_INFO *adif) {
161   /* ADIF definitions */
162   const int copyRightIdPresent = 0;
163 
164   if (adif->headerWritten) return 0;
165 
166   int bits = 0;
167 
168   bits += 8 * 4; /* ADIF ID */
169 
170   bits += 1; /* Copyright present */
171 
172   if (copyRightIdPresent) bits += 72; /* Copyright ID */
173 
174   bits += 26;
175 
176   bits += 4; /* Number of PCE's */
177 
178   if (!adif->bVariableRate) {
179     bits += 20;
180   }
181 
182   /* write PCE */
183   bits = transportEnc_GetPCEBits(adif->cm, adif->matrixMixdownA, bits);
184 
185   return bits;
186 }
187