1、 ETSI TS 126 411 V15.0.0 (2018-07) Digital cellular telecommunications system (Phase 2+) (GSM); Universal Mobile Telecommunications System (UMTS); LTE; General audio codec audio processing functions; Enhanced aacPlus general audio codec; Fixed-point ANSI-C code (3GPP TS 26.411 version 15.0.0 Release
2、 15) TECHNICAL SPECIFICATION ETSI ETSI TS 126 411 V15.0.0 (2018-07)13GPP TS 26.411 version 15.0.0 Release 15Reference RTS/TSGS-0426411vf00 Keywords GSM,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 0001
3、7 - NAF 742 C Association but non lucratif enregistre la Sous-Prfecture de Grasse (06) N 7803/88 Important notice The present document can be downloaded from: http:/www.etsi.org/standards-search The present document may be made available in electronic versions and/or in print. The content of any ele
4、ctronic and/or print versions of the present document shall not be modified without the prior written authorization of ETSI. In case of any existing or perceived difference in contents between such versions and/or in print, the only prevailing document is the print of the Portable Document Format (P
5、DF) version kept on a specific network drive within ETSI Secretariat. Users of the present document should be aware that the document may be subject to revision or change of status. Information on the current status of this and other ETSI documents is available at https:/portal.etsi.org/TB/ETSIDeliv
6、erableStatus.aspx If you find errors in the present document, please send your comment to one of the following services: https:/portal.etsi.org/People/CommiteeSupportStaff.aspx Copyright Notification No part may be reproduced or utilized in any form or by any means, electronic or mechanical, includi
7、ng photocopying and microfilm except as authorized by written permission of ETSI. The content of the PDF version shall not be modified without the written authorization of ETSI. The copyright and the foregoing restriction extend to reproduction in all media. ETSI 2018. All rights reserved. DECTTM, P
8、LUGTESTSTM, UMTSTMand the ETSI logo are trademarks of ETSI registered for the benefit of its Members. 3GPPTM and LTETMare 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. GSMand the GSM logo
9、 are trademarks registered and owned by the GSM Association. ETSI ETSI TS 126 411 V15.0.0 (2018-07)23GPP TS 26.411 version 15.0.0 Release 15Intellectual Property Rights Essential patents IPRs essential or potentially essential to normative deliverables may have been declared to ETSI. The information
10、 pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and 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 S
11、ecretariat. Latest updates are available on the ETSI Web server (https:/ipr.etsi.org/). Pursuant to the 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 updat
12、es on the ETSI Web server) which are, or may be, or may become, essential to the present document. Trademarks The present document may include trademarks and/or tradenames which are asserted and/or registered by their owners. ETSI claims no ownership of these except for any which are indicated as be
13、ing the property of ETSI, and conveys no right to use or reproduce any trademark and/or tradename. Mention 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 Specifica
14、tion (TS) has been produced by ETSI 3rd Generation Partnership Project (3GPP). The present document may 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.
15、 The cross reference between GSM, UMTS, 3GPP and ETSI identities can be found under http:/webapp.etsi.org/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 a
16、s described in clause 3.2 of the ETSI Drafting Rules (Verbal forms for the expression of provisions). “must“ and “must not“ are NOT allowed in ETSI deliverables except when used in direct citation. ETSI ETSI TS 126 411 V15.0.0 (2018-07)33GPP TS 26.411 version 15.0.0 Release 15Contents Intellectual P
17、roperty Rights 2g3Foreword . 2g3Modal verbs terminology 2g3Foreword . 4g31 Scope 5g32 References 5g33 Definitions and abbreviations . 5g33.1 Definitions 5g33.2 Abbreviations . 5g34 Fixed point ANSI-C code structure 6g34.1 Contents of the fixed point ANSI-C source code . 6g34.2 Program execution 8g34
18、.3 Memory requirements 9g34.3.1 Constants and tables 9g34.3.2 Static memory . 14g34.3.3 Dynamic memory . 15g34.3.4 Maximum stack size . 16g35 File formats 23g35.1 Audio input file (encoder input/decoder output) 23g35.2 Bitstream file format (encoder output/decoder input) 23g35.3 Error pattern file (
19、decoder input) 23g3Annex A (informative): Weighted MOPS 24g3Annex B (informative): Change history . 25g3History 26g3ETSI ETSI TS 126 411 V15.0.0 (2018-07)43GPP TS 26.411 version 15.0.0 Release 15Foreword This Technical Specification has been produced by the 3rdGeneration Partnership Project (3GPP).
20、The contents of 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
21、as follows: Version 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, update
22、s, etc. z the third digit is incremented when editorial only changes have been incorporated in the document. ETSI ETSI TS 126 411 V15.0.0 (2018-07)53GPP TS 26.411 version 15.0.0 Release 151 Scope The present document contains an electronic copy of the ANSI-C code for the Fixed-point Enhanced aacPlus
23、 codec 1. 2 References The following documents contain provisions which, through 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 referen
24、ce, subsequent revisions do not apply. - For a non-specific reference, the latest 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.
25、1 3GPP TS 26.401: “General audio codec audio processing functions; Enhanced aacPlus general audio codec; General description“. 2 3GPP TS 26.403: “General audio codec audio processing functions; Enhanced aacPlus general audio codec; Encoder specification; Advanced Audio Coding (AAC) part“. 3 3GPP TS
26、26.404: “General audio codec audio processing functions; Enhanced aacPlus general audio codec; Encoder specification; Spectral Band Replication (SBR) part“. 4 3GPP TS 26.405: “General audio codec audio processing functions; Enhanced aacPlus general audio codec; Encoder specification; Parametric ster
27、eo part“. 5 ISO/IEC 14496-3 (2001): “Information technology - Coding of audio-visual objects - Part 3: Audio“. 6 ISO/IEC 14496-3:2001/Amd.1:2003: “Bandwidth Extension“. 7 ISO/IEC 14496-3:2001/Amd.1:2003/Cor 1:2004. 8 ISO/IEC 14496-3:2001/ Amd.2:2004: “Parametric coding for high quality audio“. 9 3GP
28、P TS 26.402: “General audio codec audio processing functions; Enhanced aacPlus general audio codec; Additional decoder tools“. 10 3GPP TS 26.244: “Transparent end-to-end streaming service; 3GPP file format (3GP)“. 3 Definitions and abbreviations 3.1 Definitions For the purposes of the present docume
29、nt, the terms and definitions given in 3GPP TS 26.401 1, 3GPP TS 26.403 2, 3GPP TS 26.404 3, 3GPP TS 26.405 4 and 3GPP TS 26.402 9 apply. 3.2 Abbreviations For the purposes of the present document, the following abbreviations apply: AAC Advanced Audio Coding aacPlus Combination of MPEG-4 AAC and MPE
30、G-4 Bandwidth extension (SBR) ANSI American National Standards Institute Enhanced aacPlus Combination of MPEG-4 AAC, MPEG-4 Bandwidth extension (SBR) and MPEG-4 Parametric Stereo GSM Global System for Mobile communications ETSI ETSI TS 126 411 V15.0.0 (2018-07)63GPP TS 26.411 version 15.0.0 Release
31、15I/O Input/Output MDCT Modified Discrete Cosine Transform QMF Quadrature Mirror Filter RAM Random Access MemoryROM Read Only Memory SBR Spectral Band Replication 4 Fixed point ANSI-C code structure This clause gives an overview of the structure of the fixed point ANSI-C code and provides an overvie
32、w of the contents and organization of the C code attached to the present document. The C code has been verified on the following systems: - IBM PC/AT compatible computers with Windows XP, 2000 and Microsoft Visual C+ v.6.0 compiler. - IBM PC/AT compatible computers with Linux OS and GCC v.3.3 compil
33、er. ANSI-C was selected as the programming language because portability was desirable. 4.1 Contents of the fixed point ANSI-C source code The C code distribution is organized in two directories for encoder and decoder and further into several subdirectories, reflecting the major building blocks of t
34、he Enhanced aacPlus codec. The file descriptions on root level as well as the directory structure is given as follows. Table 1: Source code directory structure for the encoder (ETSI_aacPlusenc) Directory Description README.txt information on how to compile Makefile UNIX style encoder Makefile enhAac
35、Plusenc.dsw Win32 MSVC 6.0 encoder workspace enhAacPlusenc.dsp Win32 MSVC 6.0 encoder makefile src/ directory for the encoder frontend etsiop_fastaacenc/ AAC encoder library etsiop_resamplib/ resampler libraryetsiop_sbrenclib/ SBR encoder library Table 2: Source code directory structure for the deco
36、der (ETSI_aacPlusdec) Directory Description README.txt information on how to compile Makefile UNIX style encoder Makefile enhAacPlusdec.dsw Win32 MSVC 6.0 decoder workspace src/ directory for the decoder frontend etsiop_aacdec AAC decoder library etsiop_sbrdeclib/ SBR decoder library Table 3: Source
37、 code directory structure common for encoder and decoder Directory Description etsiop_bitbuf/ bitstream reading/writing library etsiop_ffrlib/ general purpose functionalities etsioplib/ ETSI operators implementation 3g_lib/ precompiled libraries for audio and bitstream file format handling The distr
38、ibuted files with suffix “c“ contain the source code and the files with suffix “h“ are the header files. Within the respective libraries, the RAM data is contained in “xxx_ram“ files with suffix “c“, the ROM data is contained in “xxx_rom“ files with suffix “c“. Makefiles are provided for the platfor
39、ms in which the C code has been verified (listed above). ETSI ETSI TS 126 411 V15.0.0 (2018-07)73GPP TS 26.411 version 15.0.0 Release 15A list of source code files is given below: Table 4: Encoder source code files Directory Module src/ main.c mp4file.cetsiop_fastaacenc/ qc_main.c aacenc.cms_stereo.
40、cspreading.c interface.cbit_cnt.cadj_thr.c quantize.cpsy_configuration.c sf_estim.c tns_param.cgrp_data.cpre_echo_control.c stprepro.c tns.cdyn_bits.cpsy_main.c channel_map.cblock_switch.cband_nrg.c transform.c bitenc.cline_pe.c stat_bits.cetsiop_sbrenc/ qmf_enc.c ton_corr.cfram_gen.cenv_bit.c env_e
41、st.cmh_det.chybrid.c bit_sbr.cps_bitenc.csbr_main.c tran_det.csbr_misc.ccode_env.c nf_est.cfreq_sca.cinvf_est.c ps_enc.cetsiop_resamplib/ downsample_FIR.c ETSI ETSI TS 126 411 V15.0.0 (2018-07)83GPP TS 26.411 version 15.0.0 Release 15Table 5: Decoder source code files Directory Module src/ main.c fi
42、leifc.cspline_resampler.c etsiop_aacdec/ aacdecoder.c streaminfo.cchannelinfo.cstereo.c longblock.cshortblock.cpulsedata.c block.cpns.c imdct.ctns.cbitstream.c channel.cconceal.cdatastream.c etsiop_sbrdeclib/ env_dec.c aacpluscheck.cenv_calc.clpp_tran.c sbrdecoder.csbr_dec.csbr_crc.c hybrid.cps_bitd
43、ec.cenv_extr.c freq_sca.c ps_dec.cqmf_dec.cTable 6: Common source code files Directory Module etsiop_bitbuf/ bitbuffer.c etsiop_ffrlib/ fft_32x32.c transcendent.ctranscendent_enc.c intrinsics.c vector.c 4.2 Program execution The Enhanced aacPlus codec is implemented in two programs: - enhAacPlusEnc.
44、exe. - enhAacPlusDec.exe. The programs should be called like: - enhAacPlusEnc.exe . - enhAacPlusDec.exe error_pattern_file. The audio files contain 16-bit linear encoded PCM samples with wav header, the bitstream files are of 3GPP type an the error pattern file is a ASCII file, see clause 5. The enc
45、oder and decoder command line handling is also explained by running the applications without input arguments. ETSI ETSI TS 126 411 V15.0.0 (2018-07)93GPP TS 26.411 version 15.0.0 Release 154.3 Memory requirements The data types of variables and tables used in the fixed-point implementation are defin
46、ed by the ETSI operator data types, the following types are used: - Word8. - Word16. - Word32. - Flag. 4.3.1 Constants and tables This clause contains a listing of all constants and tables contributing to the ROM requirements of the encoder and decoder. Table 7: Encoder constants and tables Name Dat
47、a type Size 16-bit word Allocated in Source File Description LongWindowSine Word16 1 024 aac_rom.c Window coefficients ShortWindowSine Word16 128 aac_rom.c Window coefficientsLongWindowKBD Word16 1 024 aac_rom.c Window coefficients fftTwiddleTable Word16 513 aac_rom.c FFT twiddle coefficients formfa
48、c_sqrttable Word32 192 aac_rom.c Lookup table for efficient sqrt implementation mTab_3_4 Word32 1 024 aac_rom.c Quantizer table, used for efficient pow () implementation mTab_4_3 Word32 1 024 aac_rom.c Inverse quantizer table, used for efficient pow () implementation pow2tominusNover16 Word16 17 aac
49、_rom.c Lookup table for efficient pow() implementation specExpMantTableComb_enc Word32 128 aac_rom.c Lookup table for efficient inverse quantizer implementation specExpTableComb_enc Word8 32 aac_rom.c Lookup table for efficient inverse quantizer implementation quantBorders Word16 16 aac_rom.c Lookup table for efficient distortion calculation implementation quantBorders Word16 12 aac_rom.c Lookup table for efficient distortion calculation implementation p_8000_mono_long TNS_CONFIG_TABULATED 5 aac_rom.c TNS tuning parameters p_8000_stereo_l
