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** aacgain - modifications to mp3gain to support mp4/m4a files
** Copyright (C) 2004-2010 David Lasker, Altos Design, Inc.
** This program is free software; you can redistribute it and/or modify
** it under the terms of the GNU General Public License as published by
** the Free Software Foundation; either version 2 of the License, or
** (at your option) any later version.
** This program is distributed in the hope that it will be useful,
** but WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
** GNU General Public License for more details.
** You should have received a copy of the GNU General Public License
** along with this program; if not, write to the Free Software
** Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
AACGAIN VERSION 1.9
AACgain is a modification to Glen Sawyer's mp3gain, to support AAC
(mp4/m4a/QuickTime) files as well as mp3 files. If you are not familiar with
mp3gain, stop reading this, and go to http://mp3gain.sourceforge.net
1. BACK UP YOUR MUSIC FILES BEFORE USING AACGAIN! UNLIKE MP3GAIN, AACGAIN IS
NOT COMPLETELY REVERSABLE. THE UNDO OPTION IS INTENDED TO RESTORE A MUSIC
FILE TO BE FUNCTIONALLY EQUIVALENT TO ITS ORIGINAL STATE, BUT IT WILL NOT
BE BIT-FOR-BIT IDENTICAL TO THE ORIGINAL FILE. IT IS POSSIBLE FOR APPLE
TO CHANGE THE ITUNES MUSIC FILE FORMAT IN WAYS THAT ARE INCOMPATIBLE
WITH AACGAIN, RESULTING IN CORRUPTED MUSIC FILES THAT CANNOT BE RESTORED
TO THEIR ORIGINAL STATE. I AM NOT RESPONSIBLE FOR DAMAGED FILES.
2. AACGain supports files in the mp4/Quicktime file format. These files
usually have a file extension of .mp4, .m4a, or m4v. Raw AAC files,
files encoded with HE-AAC/SBR, or Apple Lossless files are not supported.
3. DRM'ed files purchased from the iTunes music store are not supported. You
may convert these to .m4a format by burning them to a CD-ROM and importing
them back into iTunes, or by using one of the underground methods to
losslessly convert them to .m4a.
4. AACGain takes the same command line options as mp3gain - no
changes have been made to the command usage.
5. If you rename the AACGain.exe executable to mp3gain.exe, it will work
with the Visual Basic front-end MP3GainGUI.exe.
6. When calculating or applying album gain, you may mix aac and mp3 files
in the same command.
7. The /t (use temp file) option is ignored for aac files. A temp file
is always used. The mp4v2 Optimize function is used to copy the
processed file back to the original name. Experience has shown that this
is required for processed music files to play on older iPods.
8. The /w (wrap) flag is ignored for aac files, since allowing an aac file
to wrap will leave it in an unplayable state.
9. The /f (assume input file is an MPEG 2 Layer III) option is ignored
for mp4/m4a/m4v files. If a file starts with a 'ftyp' atom, it is assumed
to be an mp4 container, even if /f was specified.
10. The /s i (id2v3) option is ignored for mp4/m4a/m4v files. The tags for
these files are stored in iTunes metadata format as described below.
11. The following metadata tags will be added to your mp4/m4a files:
These are all free-form metadata tags (moov.udta.meta.ilst.----)
with 'data' text fields in the same format as the mp3gain
equivalents. You may use AtomicParsley (download from sourceforge)
to view the tags.
This is free software. No support is provided.
You may try to post questions on the Hydrogen Audio AAC Tech forum:
I regularly monitor this forum, and use it to announce new releases
You may email me questions, but there is no guarantee of a response.
If you have what you believe to be a valid .m4a/.mp4 file that is
not processed correctly by aacgain, please attach it to your email.
I do not support the original mp3gain code.
WHAT'S NEW IN VERSION 1.9
a) Fixed a bug in mp4v2 which caused iTunes music video files
to fail with "not a valid mp4/m4a file" error.
b) Gives a more meaningful error message when attempting to
process Apple Lossless files.
c) Built with updated mp4v2 from Google Code, which should build
error-free on modern Windows and Linux systems.
d) Built with updated faad2 code, which should build error-free
on modern Windows and Linux systems.
d) Built with latest mp3gain version 1.5.2 sources checked into CVS,
which include id3v2 tag support.
e) MSVC++ solution and project files have been converted to Visual
C++ 2010 Express Edition.
WHAT'S NEW IN VERSION 1.8
a) Built with mpeg4ip/mp4v2 version 1.6.1. aacgain 1.7.1 was built with
version 1.5.20. mp4v2 version 1.6.1 corrects problems that corrupted
video files containing Quicktime chapter markers.
b) Built with latest mp3gain version 1.4.7 sources checked into CVS.
The mp3gain changes made since 1.7.1 support sample rates up to 96000.
Previous versions had a maxmimum sample rate of 48000.
c) Ignores faad2 "scalefactor out of range" errors. These errors resulted
in "invalid file format" errors on apparently good files.
WHAT'S NEW IN VERSION 1.7.1
a) MSVC++ solution and project files have been converted to Visual
C++ 2005 Express Edition. Other than the version number, no other
source code changes have been made.
WHAT'S NEW IN VERSION 1.7
a) If the total length of the directory plus file name path exceeded
64 bytes, memory corruption would occur. This has been corrected.
WHAT'S NEW IN VERSION 1.6
a) Files with a 'cprt' (copyright) tag are now processed correctly.
Previous versions of aacgain corrupted the metadata of files with a
b) AACGain now works on video or other files where the first audio track
has a track number of other than 1. Previous versions required the
audio track to have a number of 1. AACGain will still only process
the first audio track found on a file. Thanks to Arthur Yarwood at
Sony Computer Entertainment Europe for this fix.
WHAT'S NEW IN VERSION 1.5
a) Running AACGain on Apple lossless or other unsupported file format
resulted in a crash with an unhandled exception. This is now fixed.
WHAT'S NEW IN VERSION 1.4
a) Temporary files are created in the same directory as the input file.
Formerly they were created in the same directory that the program was run
in. This solves a problem only seen on Unix systems where the temporary
file could not be renamed back to the original input filename, if the
input file was located on a different filesystem from where the program
was run. Windows users are unaffected by this problem and can continue to
WHAT'S NEW IN VERSION 1.3
a) Always uses the /t (use temp file) option, even if it is not specified
on the command line. This resolves issues where processed files would
not play on the iPod Shuffle.
b) Preserves original values of MP4 properties bufferSizeDB, maxBitrate and
avgBitrate. Without this change, mpeg4ip/mp4vs was recalulating the
actual values of these parameters. This caused bitrate as displayed by
iTunes to change slightly, i.e. songs ripped at 320KB would display as
c) Incorporates recent changes to mp3gain which prevent crashes when
working with 48KB files on Linux.
d) Source code directory structure was reorganized to be compatible with mp3gain
CVS on sourceforge. Thanks to Glen Sawyer, the AACGain source code is now
hosted on sourceforge's CVS repository as part of the mp3gain project.
WHAT'S NEW IN VERSION 1.2
a) Fixes compatibility issue with MP3GainGUI version 1.2.5 or 1.3.4.
b) All temporary files created are erased.
WHAT'S NEW IN VERSION 1.1
a) Multi-channel and mono files now work.
b) Fixes compatibility issues with MP3GainGUI:
- /o option always outputs Album gain
c) /f option is ignored for AAC files - see usage notes below.
d) Uses portable versions of all library functions, and has been
successfully compiled under Linux. Thanks to Prakash Punnoor
for his help with this.
BUILDING AACGAIN FOR WINDOWS FROM SOURCE CODE
MSVC++ solution and project files have been converted for Visual C++
2010 Express Edition. The MVSC++ 2005 and 6.0 project and solution files
are no longer being maintained. It is now required to use VC++ 2010 to
build aacgain for Windows.
In order to build AACGain for Windows, the following components are
required. You may download them from the links listed below:
Thanks to Glen Sawyer, aacgain source code is checked into the sourceforge
CVS repository as part of the mp3gain project. A CVS client is required.
See the instructions at http://sourceforge.net/cvs/?group_id=49979. The
commands to check out the aacgain source code are:
cvs -d:pserver:email@example.com:/cvsroot/mp3gain login
cvs -z3 -d:pserver:firstname.lastname@example.org:/cvsroot/mp3gain co -P aacgain
You may use either the zipped version 1.5.1 source code at
http://mp3gain.sourceforge.net/download.php or check out the code from
the latest CVS. The CVS commands to check out the mp3gain source code are:
cvs -d:pserver:email@example.com:/cvsroot/mp3gain login
cvs -z3 -d:pserver:firstname.lastname@example.org:/cvsroot/mp3gain co -P mp3gain
The latest version of aacgain was build from mp3gain source files from CVS
that were most recently modified on May 19 03:48:34 2010 UTC.
aacgain was built using the the FAAD2 release 2.7 dated 2009-02-10
downloaded from http://sourceforge.net/projects/faac/files/.
Download any of the faad2-2.7 source files and expand the archive as a peer
to the aacgain directory. Rename its top-level directory to faad2.
Due to the way aacgain is programmed, using modified copies of faad2's
decoder.c and syntax.c, use of any earlier or later version of faad2
is not recommended.
As of version 1.9, aacgain uses the mp4v2 code found at
http://code.google.com/p/mp4v2/. aacgain is built using the mp4v2 r355
snapshot. aacgain uses the r355 snapshot, rather than the official
release 1.9.1, due to its use of iTMF tags.
Download the tarball mp4v2-trunk-r355.tar.bz2, and expand the archive.
Rename its top level directory to mp4v2.
Due to the patches described below, use of any earlier or later version
of mp4v2 is not recommended.
A patch file mp4v2.patch is in the aacgain directory. This patch
fixes two issues:
1) The first 2 groups of patches to mp4track.cpp remove code which
recomputes the maximum and average bitrates. If this code is not
removed, a file with a nominal bitrate of 128KB may have its bitrate
changed to something like 131287.
2) The last group in the patch to mp4track.cpp fixes a bug which prevents
iTunes music videos from being processed correctly. See the comments
in the patch for details. I reported this bug to the mp4v2 developers,
and it is fixed in the latest mp4v2 svn. However, the Visual Studio project
files in svn will not convert to VC++ Express, due to their use of features
only in the full (paid) version of Visual Studio. Therefore, I am
using the r355 tarball, and patching the bug myself.
cd to the aacgain directory where mp4v2.patch is located. Apply the patch with
patch -p0 <mp4v2.patch
If you don't care about the above issues you may skip applying this patch.
The components must be arranged in the following directory hierarchy:
-- aacgain containing aacgain.sln/.vcprojx and source files
-- libfaad containing libfaad.sln/.vcproj
-- mp4v2 (rename its top directory from what was in the tar.bz2 file)
-- vstudio9.0 containing mp4v2.sln
-- src and other directories
Earlier versions of aacgain built mp4v2 as part of the aacgain
solution. However, the mp4v2 from Google Code requires
massive changes to its include paths to do this. It is much easier
to build it separately, and then just link its library
into the aacgain solution. In order to build libmp4v2,
open mp4v2\vstudio9.0\mp4v2.sln in VC++2010. Allow the conversion to
complete. Delete any projects marked "(unavailable)". Build the
"Debug Static" and "Release Static" configurations.
Open faad2\libfaad\libfaad.sln in VC++2010 and allow the conversion to
complete. Don't build libfaad at this point; it will be built as part of
Open aacgain/aacgain.sln. There should be 3 projects in your solution:
Make the following changes to the libfaad project properties:
a) Change the C++/Code generation/Runtime Library property for libfaad to
"Multi-threaded Debug (/MTd)" for debug build and "Multi-threaded (/MT)"
for release build.
b) Change the C++/Optimization/Whole Program Optimization property to
YES(/GL) for the release build only.
c) Change the Librarian/General/Link Time Code Generation property
to YES(/LTCG) for the release build only.
At this point, you may press F7 and cross your fingers:-)
The aacgain.exe executable will be found in the aagain/Debug or
BUILDING AACGAIN FOR UNIX (LINUX/MAC OS X) FROM SOURCE CODE
Thanks to Prakash Punoor, the source code is portable,
and has been compiled for Linux and Mac OS X.
I now have access to both Linux and Mac systems, so I have modified
Prakash's scripts to build correctly with the latest code changes.
See the file aacgain/linux/README.linux for detailed Linux/Mac build
HOW AACGAIN WORKS
mp4v2 is used to parse the mp4/QuickTime file format, to
read individual samples so that they can be passed to faad2, and to
read and write replaygain metadata tags.
faad2 is used to de-compress and decode the aac frames into linear
PCM for analysis by the replaygain algorithm.
Files syntax.c and decoder.c are slightly modified versions of the
corresponding files from faad2. The modifications allow the offsets
and original values of the global_gain fields to be saved. Since the
modified functions were declared static in libfaad, I am able to use
my own modified copies of these functions without getting duplicate
definition link errors.
mp4v2 is used to apply any gain changes needed. It does this as follows:
a) creates a new audio track
b) copyies the samples from the original audio track to the new track
with the global_gain fields appropriately modified
c) deletes the original audio track
d) modifies the trackId property of the new track, and the nextTrackId
property of the moov atom, to be the same as in the input file.
aacgain.cpp is a wrapper for the above functionality.
mp3gain.c has been modified to call aacgain when the symbol AACGAIN is
defined. mp3gain versions 1.5 and later have this modification included.
I am a total newbie to digital audio, and I created AACGain primarily
as a learning exercise. I couldn't have done it without the help of others:
1. Thanks to the user community at hydrogenaudio.org and audiocoding.com,
especially Menno and Hans-J�rgen.
2. Thanks to Bill May for helping me get started with mp4v2.
3. Thanks to Prakash Punnoor, Hardloaf, Ben Allison, and Miguel Angel Alvarez
for their help with Linux and Mac.
4. Last, but not least, thanks to Glen Sawyer for creating mp3gain.