• Home
  • History
  • Annotate
  • Line#
  • Scopes#
  • Navigate#
  • Raw
  • Download
1  
2  /* -----------------------------------------------------------------------------------------------------------
3  Software License for The Fraunhofer FDK AAC Codec Library for Android
4  
5  � Copyright  1995 - 2013 Fraunhofer-Gesellschaft zur F�rderung der angewandten Forschung e.V.
6    All rights reserved.
7  
8   1.    INTRODUCTION
9  The Fraunhofer FDK AAC Codec Library for Android ("FDK AAC Codec") is software that implements
10  the MPEG Advanced Audio Coding ("AAC") encoding and decoding scheme for digital audio.
11  This FDK AAC Codec software is intended to be used on a wide variety of Android devices.
12  
13  AAC's HE-AAC and HE-AAC v2 versions are regarded as today's most efficient general perceptual
14  audio codecs. AAC-ELD is considered the best-performing full-bandwidth communications codec by
15  independent studies and is widely deployed. AAC has been standardized by ISO and IEC as part
16  of the MPEG specifications.
17  
18  Patent licenses for necessary patent claims for the FDK AAC Codec (including those of Fraunhofer)
19  may be obtained through Via Licensing (www.vialicensing.com) or through the respective patent owners
20  individually for the purpose of encoding or decoding bit streams in products that are compliant with
21  the ISO/IEC MPEG audio standards. Please note that most manufacturers of Android devices already license
22  these patent claims through Via Licensing or directly from the patent owners, and therefore FDK AAC Codec
23  software may already be covered under those patent licenses when it is used for those licensed purposes only.
24  
25  Commercially-licensed AAC software libraries, including floating-point versions with enhanced sound quality,
26  are also available from Fraunhofer. Users are encouraged to check the Fraunhofer website for additional
27  applications information and documentation.
28  
29  2.    COPYRIGHT LICENSE
30  
31  Redistribution and use in source and binary forms, with or without modification, are permitted without
32  payment of copyright license fees provided that you satisfy the following conditions:
33  
34  You must retain the complete text of this software license in redistributions of the FDK AAC Codec or
35  your modifications thereto in source code form.
36  
37  You must retain the complete text of this software license in the documentation and/or other materials
38  provided with redistributions of the FDK AAC Codec or your modifications thereto in binary form.
39  You must make available free of charge copies of the complete source code of the FDK AAC Codec and your
40  modifications thereto to recipients of copies in binary form.
41  
42  The name of Fraunhofer may not be used to endorse or promote products derived from this library without
43  prior written permission.
44  
45  You may not charge copyright license fees for anyone to use, copy or distribute the FDK AAC Codec
46  software or your modifications thereto.
47  
48  Your modified versions of the FDK AAC Codec must carry prominent notices stating that you changed the software
49  and 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  
53  3.    NO PATENT LICENSE
54  
55  NO EXPRESS OR IMPLIED LICENSES TO ANY PATENT CLAIMS, including without limitation the patents of Fraunhofer,
56  ARE GRANTED BY THIS SOFTWARE LICENSE. Fraunhofer provides no warranty of patent non-infringement with
57  respect to this software.
58  
59  You may use this FDK AAC Codec software or modifications thereto only for purposes that are authorized
60  by appropriate patent licenses.
61  
62  4.    DISCLAIMER
63  
64  This 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
66  of merchantability and fitness for a particular purpose. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
67  CONTRIBUTORS BE LIABLE for any direct, indirect, incidental, special, exemplary, or consequential damages,
68  including but not limited to procurement of substitute goods or services; loss of use, data, or profits,
69  or business interruption, however caused and on any theory of liability, whether in contract, strict
70  liability, or tort (including negligence), arising in any way out of the use of this software, even if
71  advised of the possibility of such damage.
72  
73  5.    CONTACT INFORMATION
74  
75  Fraunhofer Institute for Integrated Circuits IIS
76  Attention: Audio and Multimedia Departments - FDK AAC LL
77  Am Wolfsmantel 33
78  91058 Erlangen, Germany
79  
80  www.iis.fraunhofer.de/amm
81  amm-info@iis.fraunhofer.de
82  ----------------------------------------------------------------------------------------------------------- */
83  
84  /*****************************  MPEG-4 AAC Encoder  **************************
85  
86     Author(s):
87     Description:
88  
89  ******************************************************************************/
90  
91  #ifndef TPENC_LATM_H
92  #define TPENC_LATM_H
93  
94  
95  
96  #include "tpenc_lib.h"
97  #include "FDK_bitstream.h"
98  
99  
100  #define DEFAULT_LATM_NR_OF_SUBFRAMES 1
101  #define DEFAULT_LATM_SMC_REPEAT      8
102  
103  #define MAX_AAC_LAYERS        9
104  
105  #define LATM_MAX_PROGRAMS     1
106  #define LATM_MAX_STREAM_ID   16
107  
108  #define LATM_MAX_LAYERS       1 /*MAX_AAC_LAYERS*/
109  
110  #define MAX_NR_OF_SUBFRAMES   2           /* set this carefully to avoid buffer overflows */
111  
112  typedef enum { LATMVAR_SIMPLE_SEQUENCE } LATM_VAR_MODE;
113  
114  typedef struct {
115    signed int frameLengthType;
116    signed int frameLengthBits;
117    signed int varFrameLengthTable[4];
118    signed int streamID;
119  } LATM_LAYER_INFO;
120  
121  
122  typedef struct {
123    LATM_LAYER_INFO      m_linfo[LATM_MAX_PROGRAMS][LATM_MAX_LAYERS];
124    CODER_CONFIG        *config[LATM_MAX_PROGRAMS][LATM_MAX_LAYERS];
125  
126    LATM_VAR_MODE        varMode;
127    TRANSPORT_TYPE       tt;
128  
129    int                  audioMuxLengthBytes;
130  
131    int                  audioMuxLengthBytesPos;
132    int                  taraBufferFullness; /* state of the bit reservoir */
133    int                  varStreamCnt;
134    unsigned int         otherDataLenBytes;
135  
136    UCHAR                latmFrameCounter;   /* Current frame number. Counts modulo muxConfigPeriod */
137    UCHAR                muxConfigPeriod;    /* Distance in frames between MuxConfig */
138  
139    UCHAR                audioMuxVersion;    /* AMV1 supports transmission of taraBufferFullness and ASC lengths */
140    UCHAR                audioMuxVersionA;   /* for future extensions */
141  
142    UCHAR                noProgram;
143    UCHAR                noLayer[LATM_MAX_PROGRAMS];
144    UCHAR                fractDelayPresent;
145  
146    UCHAR                allStreamsSameTimeFraming;
147    UCHAR                subFrameCnt;        /* Current Subframe frame */
148    UCHAR                noSubframes;        /* Number of subframes    */
149    UINT                 latmSubframeStart;  /* Position of current subframe start */
150    UCHAR                noSubframes_next;
151  
152    UCHAR                fillBits;           /* AudioMuxElement fill bits */
153    UCHAR                streamMuxConfigBits;
154  
155  } LATM_STREAM;
156  
157  typedef LATM_STREAM *HANDLE_LATM_STREAM;
158  
159  /**
160   * \brief Initialize LATM_STREAM Handle. Creates automatically one program with one layer with
161   *        the given layerConfig. The layerConfig must be persisten because references to this pointer
162   *        are made at any time again.
163   *        Use transportEnc_Latm_AddLayer() to add more programs/layers.
164   *
165   * \param hLatmStreamInfo HANDLE_LATM_STREAM handle
166   * \param hBs Bitstream handle
167   * \param layerConfig a valid CODER_CONFIG struct containing the current audio configuration parameters
168   * \param audioMuxVersion the LATM audioMuxVersion to be used
169   * \param tt the specific TRANSPORT_TYPE to be used, either TT_MP4_LOAS, TT_MP4_LATM_MCP1 or TT_MP4_LATM_MCP0 LOAS
170   * \param cb callback information structure.
171   *
172   * \return an TRANSPORTENC_ERROR error code
173   */
174  TRANSPORTENC_ERROR transportEnc_Latm_Init(
175          HANDLE_LATM_STREAM hLatmStreamInfo,
176          HANDLE_FDK_BITSTREAM hBs,
177          CODER_CONFIG *layerConfig,
178          UINT audioMuxVersion,
179          TRANSPORT_TYPE tt,
180          CSTpCallBacks *cb
181          );
182  
183  /**
184   * \brief Get bit demand of next LATM/LOAS header
185   *
186   * \param hAss HANDLE_LATM_STREAM handle
187   * \param streamDataLength the length of the payload
188   *
189   * \return the number of bits required by the LATM/LOAS headers
190   */
191  unsigned int transportEnc_LatmCountTotalBitDemandHeader (
192                                                            HANDLE_LATM_STREAM hAss,
193                                                            unsigned int streamDataLength
194                                                           );
195  
196  /**
197   * \brief Write LATM/LOAS header into given bitstream handle
198   *
199   * \param hLatmStreamInfo HANDLE_LATM_STREAM handle
200   * \param hBitstream Bitstream handle
201   * \param auBits amount of current payload bits
202   * \param bufferFullness LATM buffer fullness value
203   * \param cb callback information structure.
204   *
205   * \return an TRANSPORTENC_ERROR error code
206   */
207  TRANSPORTENC_ERROR
208  transportEnc_LatmWrite (
209          HANDLE_LATM_STREAM    hAss,
210          HANDLE_FDK_BITSTREAM  hBitstream,
211          int                   auBits,
212          int                   bufferFullness,
213          CSTpCallBacks     *cb
214          );
215  
216  /**
217   * \brief Adjust bit count relative to current subframe
218   *
219   * \param hAss HANDLE_LATM_STREAM handle
220   * \param pBits pointer to an int, where the current frame bit count is contained,
221   *        and where the subframe relative bit count will be returned into
222   *
223   * \return void
224   */
225  void transportEnc_LatmAdjustSubframeBits(HANDLE_LATM_STREAM    hAss,
226                                           int                  *pBits);
227  
228  /**
229   * \brief Request an LATM frame, which may, or may not be available
230   *
231   * \param hAss HANDLE_LATM_STREAM handle
232   * \param hBs Bitstream handle
233   * \param pBytes pointer to an int, where the current frame byte count stored into.
234   *        A return value of zero means that currently no LATM/LOAS frame can be returned.
235   *        The latter is expected in case of multiple subframes being used.
236   *
237   * \return void
238   */
239  void transportEnc_LatmGetFrame(
240                                 HANDLE_LATM_STREAM    hAss,
241                                 HANDLE_FDK_BITSTREAM  hBs,
242                                 int                  *pBytes
243                                 );
244  
245  /**
246   * \brief Write a StreamMuxConfig into the given bitstream handle
247   *
248   * \param hAss HANDLE_LATM_STREAM handle
249   * \param hBs Bitstream handle
250   * \param bufferFullness LATM buffer fullness value
251   * \param cb callback information structure.
252   *
253   * \return void
254   */
255  TRANSPORTENC_ERROR
256  CreateStreamMuxConfig(
257          HANDLE_LATM_STREAM hAss,
258          HANDLE_FDK_BITSTREAM hBs,
259          int bufferFullness,
260          CSTpCallBacks *cb
261          );
262  
263  
264  #endif /* TPENC_LATM_H */
265