1、 ETSI TS 126 411 V14.0.0 (2017-04) 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 14.0.0 Release
2、 14) TECHNICAL SPECIFICATION ETSI ETSI TS 126 411 V14.0.0 (2017-04)13GPP TS 26.411 version 14.0.0 Release 14Reference RTS/TSGS-0426411ve00 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. European Telecommunications Standards Ins
8、titute 2017. All rights reserved. DECTTM, PLUGTESTSTM, UMTSTMand the ETSI logo are Trade Marks of ETSI registered for the benefit of its Members. 3GPPTM and LTE are Trade Marks of ETSI registered for the benefit of its Members and of the 3GPP Organizational Partners. GSM and the GSM logo are Trade M
9、arks registered and owned by the GSM Association. ETSI ETSI TS 126 411 V14.0.0 (2017-04)23GPP TS 26.411 version 14.0.0 Release 14Intellectual Property Rights IPRs essential or potentially essential to the present document may have been declared to ETSI. The information pertaining to these essential
10、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 Secretariat. Latest updates are
11、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 updates on the ETSI Web server) whic
12、h are, or may be, or may become, essential to the present document. Foreword This Technical Specification (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 GS
13、M 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.org/key/queryform.asp. Modal verbs terminology In the present document “shall“, “shall not“, “sho
14、uld“, “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). “must“ and “must not“ are NOT allowed in ETSI deliverables except when used in direct citation. E
15、TSI ETSI TS 126 411 V14.0.0 (2017-04)33GPP TS 26.411 version 14.0.0 Release 14Contents Intellectual Property 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
16、 code structure 6g34.1 Contents of the fixed point ANSI-C source code . 6g34.2 Program execution 8g34.3 Memory requirements 9g34.3.1 Constants and tables 9g34.3.2 Static memory . 14g34.3.3 Dynamic memory . 16g34.3.4 Maximum stack size . 16g35 File formats 23g35.1 Audio input file (encoder input/deco
17、der output) 23g35.2 Bitstream file format (encoder output/decoder input) 23g35.3 Error pattern file (decoder input) 23g3Annex A (informative): Weighted MOPS 24g3Annex B (informative): Change history . 25g3History 26g3ETSI ETSI TS 126 411 V14.0.0 (2017-04)43GPP TS 26.411 version 14.0.0 Release 14Fore
18、word This Technical Specification has been produced by the 3rdGeneration Partnership Project (3GPP). 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
19、 re-released by the TSG with an identifying change of release date and an increase in version number 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 secon
20、d digit is incremented for all changes of substance, i.e. technical enhancements, corrections, updates, etc. z the third digit is incremented when editorial only changes have been incorporated in the document. ETSI ETSI TS 126 411 V14.0.0 (2017-04)53GPP TS 26.411 version 14.0.0 Release 141 Scope The
21、 present document contains an electronic copy of the ANSI-C code for the Fixed-point Enhanced aacPlus 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 d
22、ate 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 latest version applies. In the case of a reference to a 3GPP document (including a GSM document), a non-specific reference implici
23、tly refers to the latest version of that document in the same Release as the present document. 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 aa
24、cPlus general audio codec; Encoder specification; Advanced Audio Coding (AAC) part“. 3 3GPP TS 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 pro
25、cessing functions; Enhanced aacPlus general audio codec; Encoder specification; Parametric stereo 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/Co
26、r 1:2004. 8 ISO/IEC 14496-3:2001/ Amd.2:2004: “Parametric coding for high quality audio“. 9 3GPP 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
27、 (3GP)“. 3 Definitions and abbreviations 3.1 Definitions For the purposes of the present document, 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 fol
28、lowing abbreviations apply: AAC Advanced Audio Coding aacPlus Combination of MPEG-4 AAC and MPEG-4 Bandwidth extension (SBR) ANSI American National Standards Institute ETSI ETSI TS 126 411 V14.0.0 (2017-04)63GPP TS 26.411 version 14.0.0 Release 14Enhanced aacPlus Combination of MPEG-4 AAC, MPEG-4 Ba
29、ndwidth extension (SBR) and MPEG-4 Parametric Stereo GSM Global System for Mobile communications I/O Input/OutputMDCT 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 cl
30、ause gives an overview of the structure of the fixed point ANSI-C code and provides an overview 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 V
31、isual C+ v.6.0 compiler. IBM PC/AT compatible computers with Linux OS and GCC v.3.3 compiler. 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
32、decoder and further into several subdirectories, reflecting the major building blocks of the 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 Descri
33、ption README.txt information on how to compile Makefile UNIX style encoder Makefile enhAacPlusenc.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 librarye
34、tsiop_sbrenclib/ SBR encoder library Table 2: Source code directory structure for the decoder (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 fronte
35、nd etsiop_aacdec AAC decoder library etsiop_sbrdeclib/ SBR decoder library Table 3: Source code directory structure common for encoder and decoder Directory Description etsiop_bitbuf/ bitstream reading/writing library etsiop_ffrlib/ general purpose functionalities etsioplib/ ETSI operators implement
36、ation 3g_lib/ precompiled libraries for audio and bitstream file format handling ETSI ETSI TS 126 411 V14.0.0 (2017-04)73GPP TS 26.411 version 14.0.0 Release 14The distributed files with suffix “c“ contain the source code and the files with suffix “h“ are the header files. Within the respective libr
37、aries, 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 platforms in which the C code has been verified (listed above). A list of source code files is given below: Table 4: Encoder source code f
38、iles Directory Module src/ main.c mp4file.cetsiop_fastaacenc/ qc_main.c aacenc.cms_stereo.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
39、 bitenc.cline_pe.c stat_bits.cetsiop_sbrenc/ qmf_enc.c ton_corr.cfram_gen.cenv_bit.c env_est.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 V14.0.0 (2017-04)83GPP TS 26.411 v
40、ersion 14.0.0 Release 14Table 5: Decoder source code files Directory Module src/ main.c fileifc.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/ e
41、nv_dec.c aacpluscheck.cenv_calc.clpp_tran.c sbrdecoder.csbr_dec.csbr_crc.c hybrid.cps_bitdec.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 Pro
42、gram execution The Enhanced aacPlus codec is implemented in two programs: enhAacPlusEnc.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
43、 are of 3GPP type an the error pattern file is a ASCII file, see clause 5. ETSI ETSI TS 126 411 V14.0.0 (2017-04)93GPP TS 26.411 version 14.0.0 Release 14The encoder and decoder command line handling is also explained by running the applications without input arguments. 4.3 Memory requirements The d
44、ata types of variables and tables used in the fixed-point implementation are defined 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
45、of the encoder and decoder. Table 7: Encoder constants and tables Name Data 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 coeffic
46、ients fftTwiddleTable Word16 513 aac_rom.c FFT twiddle coefficients formfac_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,
47、 used for efficient pow () implementation pow2tominusNover16 Word16 17 aac_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 efficien
48、t 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 paramete
49、rs p_8000_stereo_long TNS_CONFIG_TABULATED 5 aac_rom.c TNS tuning parameters p_8000_mono_short TNS_CONFIG_TABULATED 5 aac_rom.c TNS tuning parameters p_8000_stereo_short TNS_CONFIG_TABULATED 5 aac_rom.c TNS tuning parameters p_16000_mono_long TNS_CONFIG_TABULATED 5 aac_rom.c TNS tuning parameters p_16000_stereo_long TNS_CONFIG_TABULATED 5 aac_rom.c TNS tuning parameters p_16000_mono_short TNS_CONFIG_TABULATED 5 aac_rom.c TNS tuning parameters p_16000_stereo_short TNS_CONFIG_TABULATED 5 aac_rom.c TNS tuning param
