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来自「dsp上用c语言实现的aac音频算法的编解码器代码」· HTML 代码 · 共 244 行
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<html><head><title>FAAC - Freeware Advanced Audio Coder</title></head></body><h3><center>FAAC 1.18 beta (<a href="http://www.audiocoding.com/">www.audiocoding.com</a>)</center></h3><br><a name="toc"><h3>Contents</h3><menu><li><a href="#usage">Usage</a><menu><li><a href="#opts">options</a><li><a href="#notes">notes</a></menu><li><a href="#copyrights">Copyrights</a><li><a href="#patents">Patents</a><li><a href="#people">People</a></menu><br><br><a name="usage"><h3>Usage</h3>(More up to date info can be found at<a href="http://www.audiocoding.com/wiki/index.php?page=FAAC">FAAC wiki page</a> by Hans-Jürgen Bardenhagen)<br><br><kbd>faac [options] <infile> <outfile></kbd><br><br><a name="opts"><b>Options:</b><br><menu><li><kbd>-a X</kbd> Set average bitrate to approximately X kbps per channel (i.e. using -a 64 averages at 128 kbps/stereo).<li><kbd>-c <bandwidth></kbd> Set the bandwidth in Hz (default value depends on sample rate)<li><kbd>-q <quality></kbd> Set quantizer quality (default: 100, averages at approx. 128 kbps VBR for a normal stereo input file at 16 bit and 44.1 kHz sample rate).<li><kbd>--tns</kbd> Enable TNS coding.<li><kbd>--notns</kbd> Disable TNS coding.<li><kbd>-n</kbd> Disable mid/side coding.<li><kbd>-m X</kbd> AAC MPEG version, X can be 2 or 4 (default: MPEG-2, so for the sake of interoperability with non-standard compliant players like QuickTime 6 you should set it to "4").<li><kbd>-o X</kbd> AAC object type, X can be LC, MAIN or LTP (default: LC, for the same reason as with the MPEG version don't use Main or LTP).<li><kbd>-r</kbd> RAW AAC output file (i.e. without ADTS headers).<li><kbd>-P</kbd> Raw PCM input mode.<li><kbd>-R</kbd> Raw PCM input sample rate in Hz (default: 44100 Hz).<li><kbd>-B</kbd> Raw PCM input bit depth (default: 16 bits, also possible 8 bits).<li><kbd>-C</kbd> Raw PCM input channels (default: 2).</menu><kbd>- <stdin></kbd> If you simply use a hyphen/minus sign instead of an input file name, FAAC can encode directly from stdin, thus enabling piping within other applications like foobar2000 or mp4live.<br><br><a name="notes"><strong>Note:</strong> VBR output bitrate depends on -q<em><strong>AND</strong></em> -c, so you should only vary the defaultsetting -q 100 -c 16000 if you know what you're doing and/or want toexperiment with other cutoff frequencies at a given quality setting.<br><br>The ABR setting with -a is an approximate average bitrate that does not use a bit reservoir, i.e -a 64 and -q 100 at 44.1 kHz will result in exactly the same output file.<br><br>The following list should give some orientation for useful -q and -c settings,based on FAAC v1.17. The resulting VBR bitrates are referring to an averagesounding stereo file with 16bit, 44.1 kHz, i.e. ct_reference.wav in this case. Multiplexing these AAC files to MP4 with e.g. mp4creator will result in a ~3 kbps lower bitrate because of the stripped ADTS headers:<br><br>-q 130 -c 22000 -m 4 (~218 kbps)<br>-q 120 -c 20000 -m 4 (~194 kbps)<br>-q 110 -c 18000 -m 4 (~158 kbps)<br>-q 100 -c 16000 -m 4 (~129 kbps)<br>-q 90 -c 14000 -m 4 (~103 kbps)<br>-q 80 -c 12000 -m 4 (~79 kbps)<br>-q 70 -c 10000 -m 4 (~62 kbps)<br><br>The added -m 4 switch does not change the bitrate or sound of course,but is recommended for most AAC/MP4 players that use an updated FAAD2-basedplugin from this year (Winamp 2.x, foobar2000 etc.) or can't decodeMPEG-2 AAC LC files like QuickTime 6. Philips Expanium users should not usethis switch, because their CD portable does not know MPEG-4 AAC files.<br><br><br><br><a name="copyrights"><h3>Copyrights</h3>FAAC - Freeware Advanced Audio Coder(<a href="http://www.audiocoding.com/">www.audiocoding.com</a>)<pre> Portions Copyright © 1999,2000,2001 Menno Bakker Portions Copyright © 2002,2003 Krzysztof Nikiel</pre>FAAC is based on the ISO MPEG-4 reference code. For this base code thefollowing license applies:<br><pre>This software module was originally developed byFirstName LastName (CompanyName)and edited byFirstName LastName (CompanyName)FirstName LastName (CompanyName)in the course of development of the MPEG-2 NBC/MPEG-4 Audio standardISO/IEC 13818-7, 14496-1,2 and 3. This software module is animplementation of a part of one or more MPEG-2 NBC/MPEG-4 Audio toolsas specified by the MPEG-2 NBC/MPEG-4 Audio standard. ISO/IEC givesusers of the MPEG-2 NBC/MPEG-4 Audio standards free license to thissoftware module or modifications thereof for use in hardware orsoftware products claiming conformance to the MPEG-2 NBC/ MPEG-4 Audiostandards. Those intending to use this software module in hardware orsoftware products are advised that this use may infringe existingpatents. The original developer of this software module and his/hercompany, the subsequent editors and their companies, and ISO/IEC haveno liability for use of this software module or modifications thereofin an implementation. Copyright is not released for non MPEG-2NBC/MPEG-4 Audio conforming products. The original developer retainsfull right to use the code for his/her own purpose, assign or donatethe code to a third party and to inhibit third party from using thecode for non MPEG-2 NBC/MPEG-4 Audio conforming products. Thiscopyright notice must be included in all copies or derivative works.Copyright © 1997.</pre><br>For the changes made for the FAAC project the GNU Library GeneralPublic License (LGPL), version 2 1991 applies. For the changes thefollowing statement applies:<br><pre>FAAC - Freeware Advanced Audio CoderCopyright © 1999,2000,2001,2002,2003 <a href="#people">FAAC developers</a>This library is free software; you can redistribute it and/ormodify it under the terms of the GNU Lesser General PublicLicense as published by the Free Software Foundation; eitherversion 2.1 of the License, or (at your option) any later version.This library is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty ofMERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNULesser General Public License for more details.You should have received a copy of the GNU Lesser General PublicLicense along with this library; if not, write to the Free SoftwareFoundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA</pre><br><a name="patents"><h3>Patents</h3>Please note that the use of this software may require the payment ofpatent royalties. You need to consider this issue before you startbuilding derivative works. We are not warranting or indemnifying you inany way for patent royalities! YOU ARE SOLELY RESPONSIBLE FOR YOUR OWNACTIONS!<br><br><br><br><a name="people"><h3>People</h3><i>Currently maintained by</i> M. Bakker (menno)</a><br><br><i>Other contributors:</i><br>Tony Lenox<br>RageOMatic<br>thebard<br>Ivan Dimkovic<br>Krzysztof Nikiel (knik)<br>Janne Hyv鋜inen (ca5e)<br>Stuart Espey (stux)<br>Andrew Voznytsa<br>M錸s Rullg錼d<br>Bill May<br><br><br><h6><center><i>Copyright © 2003 <a href="http://www.audiocoding.com/">AudioCoding.com</a><br></i></center></h6></body></html>⌨️ 快捷键说明
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