1、 ETSI TS 126 442 V14.1.0 (2018-01) Universal Mobile Telecommunications System (UMTS); LTE; Codec for Enhanced Voice Services (EVS); ANSI C code (fixed-point) (3GPP TS 26.442 version 14.1.0 Release 14) floppy3TECHNICAL SPECIFICATION ETSI ETSI TS 126 442 V14.1.0 (2018-01)13GPP TS 26.442 version 14.1.0
2、 Release 14Reference RTS/TSGS-0426442ve10 Keywords LTE,UMTS ETSI 650 Route des Lucioles F-06921 Sophia Antipolis Cedex - FRANCE Tel.: +33 4 92 94 42 00 Fax: +33 4 93 65 47 16 Siret N 348 623 562 00017 - NAF 742 C Association but non lucratif enregistre la Sous-Prfecture de Grasse (06) N 7803/88 Impo
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8、 3GPPTM and LTE are trademarks of ETSI registered for the benefit of its Members and of the 3GPP Organizational Partners. oneM2M logo is protected for the benefit of its Members. GSM and the GSM logo are trademarks registered and owned by the GSM Association. ETSI ETSI TS 126 442 V14.1.0 (2018-01)23
9、GPP TS 26.442 version 14.1.0 Release 14Intellectual Property Rights Essential patents IPRs essential or potentially essential to the present document may have been declared to ETSI. The information pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, an
10、d can be found in ETSI SR 000 314: “Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in respect of ETSI standards“, which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web server (https:/ipr.etsi.org/). Pursuant to the
11、 ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. No guarantee can be given as to the existence of other IPRs not referenced in ETSI SR 000 314 (or the updates on the ETSI Web server) which are, or may be, or may become, essential to the present document. Trad
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13、ion of those trademarks in the present document does not constitute an endorsement by ETSI of products, services or organizations associated with those trademarks. Foreword This Technical Specification (TS) has been produced by ETSI 3rd Generation Partnership Project (3GPP). The present document may
14、 refer to technical specifications or reports using their 3GPP identities, UMTS identities or GSM identities. These should be interpreted as being references to the corresponding ETSI deliverables. The cross reference between GSM, UMTS, 3GPP and ETSI identities can be found under http:/webapp.etsi.o
15、rg/key/queryform.asp. Modal verbs terminology In the present document “shall“, “shall not“, “should“, “should not“, “may“, “need not“, “will“, “will not“, “can“ and “cannot“ are to be interpreted as described in clause 3.2 of the ETSI Drafting Rules (Verbal forms for the expression of provisions). “
16、must“ and “must not“ are NOT allowed in ETSI deliverables except when used in direct citation. ETSI ETSI TS 126 442 V14.1.0 (2018-01)33GPP TS 26.442 version 14.1.0 Release 14Contents Intellectual Property Rights 2g3Foreword . 2g3Modal verbs terminology 2g3Foreword . 4g31 Scope 5g32 References 5g33 D
17、efinitions and abbreviations . 6g33.1 Definitions 6g33.2 Abbreviations . 6g34 C code structure 6g34.1 Contents of the C source code 6g34.2 Program execution 7g35 File formats 7g35.1 Speech file (encoder input / decoder output) 7g35.2 Rate switching profile (encoder input) . 8g35.3 Parameter bitstrea
18、m file (encoder output / decoder input) . 8g35.3.1 ITU-T G.192 compliant format . 8g35.3.2 Compact storage format file 8g35.4 VoIP parameter bitstream file (decoder input) . 8g35.5 Bandwidth switching profile (encoder input) . 8g35.6 Channel-aware configuration file (encoder input and decoder output
19、) 9g35.7 JBM trace file (decoder output) 9g3Annex A (informative): Change history . 10g3History 11g3ETSI ETSI TS 126 442 V14.1.0 (2018-01)43GPP TS 26.442 version 14.1.0 Release 14Foreword This Technical Specification has been produced by the 3rdGeneration Partnership Project (3GPP). The contents of
20、the present document are subject to continuing work within the TSG and may change following formal TSG approval. Should the TSG modify the contents of the present document, it will be re-released by the TSG with an identifying change of release date and an increase in version number as follows: Vers
21、ion x.y.z where: x the first digit: 1 presented to TSG for information; 2 presented to TSG for approval; 3 or greater indicates TSG approved document under change control. y the second digit is incremented for all changes of substance, i.e. technical enhancements, corrections, updates, etc. z the th
22、ird digit is incremented when editorial only changes have been incorporated in the document. ETSI ETSI TS 126 442 V14.1.0 (2018-01)53GPP TS 26.442 version 14.1.0 Release 141 Scope The present document contains an electronic copy of the ANSI-C code for the Enhanced Voice Services (EVS) Codec. The ANS
23、I-C code is necessary for a bit exact implementation of the EVS Codec (3GPP TS 26.445), Voice Activity Detection (VAD) (3GPP TS 26.451), Comfort Noise Generation (CNG) (3GPP TS 26.449), Discontinuous Transmission (DTX) (3GPP TS 26.450), Packet Loss Concealment (PLC) of Lost Packets (3GPP TS 26.447),
24、 Jitter Buffer Management (JBM) (3GPP TS 26.448), and AMR-WB Interoperable Function (3GPP TS 26.446). Requirements for any implementation of the EVS codec to be standard compliant are specified in 3GPP TS 26.444 (Test sequences). 2 References The following documents contain provisions which, through
25、 reference in this text, constitute provisions of the present document. - References are either specific (identified by date of publication, edition number, version number, etc.) or non-specific. - For a specific reference, subsequent revisions do not apply. - For a non-specific reference, the lates
26、t version applies. In the case of a reference to a 3GPP document (including a GSM document), a non-specific reference implicitly refers to the latest version of that document in the same Release as the present document. 1 3GPP TR 21.905: “Vocabulary for 3GPP Specifications“. 2 3GPP TS 26.445: “Codec
27、 for Enhanced Voice Services (EVS); Detailed Algorithmic Description “. 3 3GPP TS 26.451: “Codec for Enhanced Voice Services (EVS); Voice Activity Detection (VAD)“. 4 3GPP TS 26.449: “Codec for Enhanced Voice Services (EVS); Comfort Noise Generation (CNG) Aspects“. 5 3GPP TS 26.450: “Codec for Enhan
28、ced Voice Services (EVS); Discontinuous Transmission (DTX)“. 6 3GPP TS 26.447: “Codec for Enhanced Voice Services (EVS); Error Concealment of Lost Packets“. 7 3GPP TS 26.448: “Codec for Enhanced Voice Services (EVS); Jitter Buffer Management“. 8 3GPP TS 26.446: “Codec for Enhanced Voice Services (EV
29、S); AMR-WB Backward Compatible Functions“. 9 3GPP TS 26.444: “Codec for Enhanced Voice Services (EVS); Test Sequences“. 10 IETF RFC 3550: “RTP: A Transport Protocol for Real-Time Applications“. 11 Recommendation ITU-T G.191 (03/10): “Software tools for speech and audio coding standardization“. 12 Re
30、commendation ITU-T G.192: “A common digital parallel interface for speech standardization activities“. ETSI ETSI TS 126 442 V14.1.0 (2018-01)63GPP TS 26.442 version 14.1.0 Release 143 Definitions and abbreviations 3.1 Definitions Definition of terms used in the present document, can be found in 3GPP
31、 TS 26.445 2, 3GPP TS 26.451 3, 3GPP TS 26.449 4, 3GPP TS 26.450 5, 3GPP TS 26.447 6, 3GPP TS 26.448 7 and 3GPP TS 26.446 8. 3.2 Abbreviations For the purposes of the present document, the abbreviations given in TR 21.905 1 and the following apply. An abbreviation defined in the present document tak
32、es precedence over the definition of the same abbreviation, if any, in TR 21.905 1. ACELP Algebraic Code-Excited Linear Prediction AMR-WB Adaptive Multi Rate Wideband (codec) CNG Comfort Noise Generator DTX Discontinuous Transmission EVS Enhanced Voice Services FB Fullband FEC Frame Erasure Concealm
33、ent IP Internet Protocol JBM Jitter Buffer Management MSB Most Significant Bit MTSI Multimedia Telephony Service for IMS NB Narrowband PS Packet SwitchedPSTN Public Switched Telephone Network SAD Sound Activity Detection SC-VBR Source Controlled - Variable Bit Rate SID Silence Insertion Descriptor S
34、WB Super Wideband VAD Voice Activity Detection WB Wideband WMOPS Weighted Millions of Operations Per Second 4 C code structure This clause gives an overview of the structure of the bit-exact C code and provides an overview of the contents and organization of the C code attached to the present docume
35、nt. The C code has been verified on the following systems: - IBM PC compatible computers with Windows 7 or 8 operating system and Microsoft Visual C+ 2010 compiler, 32 bit builds. - IBM PC compatible computers with Linux operating system and GNU gcc compiler version 4.3.x, 32 bit builds. ANSI-C was
36、selected as the programming language because portability was desirable. 4.1 Contents of the C source code The C code distribution is organized as follows: ETSI ETSI TS 126 442 V14.1.0 (2018-01)73GPP TS 26.442 version 14.1.0 Release 14Table 1: Source code directory structure Directory Description REA
37、DME.txt information on how to compile Makefile UNIX style encoder Makefile Workspace_msvc/ Directory for the MSVC 2010 project files basic_op/ Source code files containing all ITU-T fixed-point basic operators. basic_math/ Source code files contains mathematical fixed-point functions lib_com/ Source
38、 code files used in encoder and decoder lib_dec/ Source code files used solely in the decoder lib_enc/ Source code files used solely in the encoder The distributed files with suffix “c“ contain the source code and the files with suffix “h“ are the header files. The ROM data is contained in files nam
39、ed “rom_xxx“ with suffix “c“. Makefiles are provided for the platforms in which the C code has been verified (listed above). Once the software is installed, this directory will have a compiled version of the encoder (named EVS_cod) and the decoder (named EVS_dec). 4.2 Program execution The codec for
40、 Enhanced Voice Services is implemented in two programs: - EVS_cod: speech/audio encoder; - EVS_dec: speech/audio decoder. The programs should be called like: - EVS_cod encoder options ; - EVS_dec decoder options . The speech/audio files contain 16-bit linear encoded PCM speech/audio samples and the
41、 parameter files contain encoded speech/audio data. The encoder and decoder options will be explained by running the applications without input arguments. See the file readme.txt for more information on how to run the encoder and decoder programs. 5 File formats This clause describes the file format
42、s used by the encoder and decoder programs. The test sequences defined in 1 also use the file formats described here. 5.1 Speech file (encoder input / decoder output) Speech files read by the encoder and written by the decoder consist of 16-bit words speech/audio sample. The byte order depends on th
43、e host architecture (e.g. LSByte first on PCs, etc.). Both the encoder and the decoder program process complete frames (corresponding to 20 ms, for example, 640 samples at 32 kHz sampling frequency) only. The encoder will pad the last frame to integer multiples of 20ms frames, i.e. n speech frames w
44、ill be produced from an input file with a length between (n-1)*20ms+1 sample; n*20ms. The files produced by the decoder will always have a length of n*20ms. ETSI ETSI TS 126 442 V14.1.0 (2018-01)83GPP TS 26.442 version 14.1.0 Release 145.2 Rate switching profile (encoder input) The encoder program c
45、an optionally read in a rate switching profile which specifies the encoding bitrate for each frame of speech processed. The file is a binary file, generated by gen-rate-profile, which is part of STL 2009, as contained in ITU-T G.191 11. The rate switching profile can contain EVS primary mode bitrate
46、s and AMR-WB IO mode bitrates arbitrarily. I.e. switching between the two modes can be specified by the rate switching profile. 5.3 Parameter bitstream file (encoder output / decoder input) The files produced by the speech/audio encoder/expected by the speech decoder contain an arbitrary number of f
47、rames in the following available formats. 5.3.1 ITU-T G.192 compliant format SYNC_WORD DATA_LENGTH B1 B2 Bnn Each box corresponds to one Word16 value in the bitstream file, for a total of 2+nn words or 4+2nn bytes per frame, where nn is the number of encoded bits in the frame. Each encoded bit is re
48、presented as follows: Bit 0 = 0x007f, Bit 1 = 0x0081. The fields have the following meaning: - SYNC_WORD: Word to ensure correct frame synchronization between the encoder and the decoder. It is also used to indicate the occurrences of bad frames. In the encoder output: (0x6b21) In the decoder input:
49、 Good frames (0x6b21) Bad frames (0x6b20) - DATA_LENGTH: Length of the speech data. Codec mode and frame type is extracted in the decoder using this parameter 5.3.2 Compact storage format file The encoder and decoder programs can optionally write and read a file in the octet-based compact storage format. The compact storage format is specified in Annex A.2.6 of 2. 5.4 VoIP parameter bitstream file (decoder input) Packet size Arrival time RTP header G.192 format (see 5.3.1) The fields have the following size and meaning
