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MP3enc_cpp

WAV to MP3 Encoder, written in C++

  • uses LAME library (https://lame.sourceforge.io/)
  • supports encoding multiple files using pthread by putting input in directory path
  • works on Linux (x86_64), Windows 10(x86), MinGW system

Build

  • Linux, MinGW: make
  • Windows: build by Microsoft Visual Studio 2019 project

Note for Linux system

  • Some systems like fedora, centos, Amazon Linux may require glibc-static library.
$ dnf install glibc-static
or
$ sudo yum install glibc-static
  • If arch does not match,
    . build lame static library and install or copy the file(libmp3lame.a) to ./lib

Note for Windows system

  • Use Microsoft Visual Studio 2019 solution/project files - MP3enc_cpp.sln.
  • When you build libmp3lame library,
    . as recommended in README, use nmake instead of Visual Studio project.
    . this needs nasm for build (https://www.nasm.us/pub/nasm/releasebuilds/2.14.02/win64/) as it assumes nasm is available.
#__ readme ____________________________________________________________________
#	nmake -f Makefile.MSVC
#		-> build lame, but not mp3x
#		-> use Robert's code modifications
#		-> assume MSVC 6.0 compiler available
#		-> assume NASM available
#		-> assemble MMX code with NASM
#		-> no compiler warnings
#		-> use single precision float
  • and it needs a modification on its filename and to add the installation directory(default: C:\Program Files\NASM) to PATH.
diff --git a/Makefile.MSVC b/Makefile.MSVC
index 6538911..527a9a6 100644
--- a/Makefile.MSVC
+++ b/Makefile.MSVC
@@ -544,7 +544,7 @@ ASM_OBJ = $(ASM_OBJ) \
 .SUFFIXES : .nas
 .nas.obj:
        @echo $<
-       @nasmw -f $(OFF) -i libmp3lame/i386/ -DWIN32 $< -o $@
+       @nasm -f $(OFF) -i libmp3lame/i386/ -DWIN32 $< -o $@

 CC_SWITCHES = $(CC_SWITCHES) /DHAVE_NASM
 ASM_OBJ = $(ASM_OBJ) \
  • pthread headers(.\pthread_h\*.h) should be placed in include directory of either Windows SDK(C:\Program Files (x86)\Windows Kits\10\Include\{VERSION}\um) or MSVC(C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.24.28314\include).

  • In case that you encounter a link error on building pthread-w32 library,
    . to build a static library of pthread, you need to modify Makefile - '/MD' in $(XCFLAGS) to '/MT'.
    . if timespec definition duplicated, add '&& !defined(_INC_TIME)' to pthread.h

#if !defined(HAVE_STRUCT_TIMESPEC) && !defined(_INC_TIME)
#define HAVE_STRUCT_TIMESPEC
#if !defined(_TIMESPEC_DEFINED
#define _TIMESPEC_DEFINED
struct timespec {
        time_t tv_sec;
        long tv_nsec;
};
#endif /* _TIMESPEC_DEFINED */
#endif /* HAVE_STRUCT_TIMESPEC */

Usage

MP3enc_cpp <input_directory | input_filename [-o <output_filename>]> [OPTIONS]

Options:
     -h            Show help
     -r            Search subdirectories recursively
     -q <mode>     Set quality level
         fast         fast encoding with small file size
         standard     standard quality - default
         best         best quality
     -v            Verbose detail

Example:
   MP3enc_cpp input.wav -o output.mp3
   MP3enc_cpp wav_dir/ -r -q fast -v
  • To see technical detail, open ./html/index.html document generated through Doxygen