• libfaad2 主机编译和交叉编译

    前言

    安装这个是为了解决mplayer安装失败的问题。

    下载地址:

    https://www.linuxfromscratch.org/blfs/view/svn/multimedia/faad2.html

    也可以使用wget下载:

    wget https://github.com/knik0/faad2/archive/2_10_0/faad2-2_10_0.tar.gz

    或者用迅雷下载

    https://github.com/knik0/faad2/archive/2_10_0/faad2-2_10_0.tar.gz

    一 ubuntu编译脚本

    1 使用默认的系统安装目录

    1. make clean
    2. ./bootstrap
    3. ./configure --disable-static
    4. make
    5. sudo make install

    2 指定自己安装目录

    1. mkdir $(pwd)/_x86 -p
    2. make clean
    3. ./bootstrap
    4. ./configure --prefix=$(pwd)/_x86 --disable-static
    5. make
    6. sudo make install

    二 交叉编译脚本

    1. export PATH=$PATH:/usr/local/arm/gcc-linaro-4.9.4-2017.01-x86_64_arm-linux-gnueabihf/bin
    2. mkdir $(pwd)/_arm -p
    3. make clean
    4. ./bootstrap
    5. ./configure --host=arm-linux-gnueabihf CC=arm-linux-gnueabihf-gcc --prefix=$(pwd)/_arm --disable-static
    6. make
    7. make install

    编译后生成的文件目录:

    1. tree
    2. .
    3. ├── bin
    4. │   └── faad
    5. ├── include
    6. │   ├── faad.h
    7. │   └── neaacdec.h
    8. ├── lib
    9. │   ├── libfaad_drm.la
    10. │   ├── libfaad_drm.so -> libfaad_drm.so.2.0.0
    11. │   ├── libfaad_drm.so.2 -> libfaad_drm.so.2.0.0
    12. │   ├── libfaad_drm.so.2.0.0
    13. │   ├── libfaad.la
    14. │   ├── libfaad.so -> libfaad.so.2.0.0
    15. │   ├── libfaad.so.2 -> libfaad.so.2.0.0
    16. │   ├── libfaad.so.2.0.0
    17. │   └── pkgconfig
    18. │       └── faad2.pc
    19. └── share
    20.     └── man
    21.         └── man1
    22.             └── faad.1
    23.  
    24. 7 directories, 13 files

    三 从git下载

    git clone https://github.com/knik0/faad2/

    下载完毕后，会看到faad2文件夹，在其中创建编译脚本，脚本如下所示,x86.sh:

    1. make clean
    2. ./bootstrap
    3. ./configure --disable-static
    4. make
    5. sudo make install

    并执行

    从编译安装信息中可知道

    lib库安装路径：/usr/local/lib

    1. /usr/bin/mkdir -p '/usr/local/lib'
    2.  /bin/bash ../libtool   --mode=install /usr/bin/install -c   libfaad.la libfaad_drm.la '/usr/local/lib'
    3. libtool: install: /usr/bin/install -c .libs/libfaad.so.2.0.0 /usr/local/lib/libfaad.so.2.0.0
    4. libtool: install: (cd /usr/local/lib && { ln -s -f libfaad.so.2.0.0 libfaad.so.2 || { rm -f libfaad.so.2 && ln -s libfaad.so.2.0.0 libfaad.so.2; }; })
    5. libtool: install: (cd /usr/local/lib && { ln -s -f libfaad.so.2.0.0 libfaad.so || { rm -f libfaad.so && ln -s libfaad.so.2.0.0 libfaad.so; }; })
    6. libtool: install: /usr/bin/install -c .libs/libfaad.lai /usr/local/lib/libfaad.la
    7. libtool: install: /usr/bin/install -c .libs/libfaad_drm.so.2.0.0 /usr/local/lib/libfaad_drm.so.2.0.0
    8. libtool: install: (cd /usr/local/lib && { ln -s -f libfaad_drm.so.2.0.0 libfaad_drm.so.2 || { rm -f libfaad_drm.so.2 && ln -s libfaad_drm.so.2.0.0 libfaad_drm.so.2; }; })
    9. libtool: install: (cd /usr/local/lib && { ln -s -f libfaad_drm.so.2.0.0 libfaad_drm.so || { rm -f libfaad_drm.so && ln -s libfaad_drm.so.2.0.0 libfaad_drm.so; }; })
    10. libtool: install: /usr/bin/install -c .libs/libfaad_drm.lai /usr/local/lib/libfaad_drm.la
    11. libtool: finish: PATH="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/snap/bin:/sbin" ldconfig -n /usr/local/lib
    12. ----------------------------------------------------------------------
    13. Libraries have been installed in:
    14.    /usr/local/lib

    头文件路径 /usr/local/include

    usr/bin/mkdir -p '/usr/local/include'

    可执行程序路径 /usr/local/bin

    1. /usr/bin/mkdir -p '/usr/local/bin'
    2.   /bin/bash ../libtool   --mode=install /usr/bin/install -c faad '/usr/local/bin'

    安装信息路径 /usr/local/lib/pkgconfig

    1.  /usr/bin/mkdir -p '/usr/local/lib/pkgconfig'
    2.  /usr/bin/install -c -m 644 faad2.pc '/usr/local/lib/pkgconfig'

    man手册路径 /usr/local/share/man/man1/faad.1

    1.  /usr/bin/mkdir -p '/usr/local/share/man/man1'
    2.  /usr/bin/install -c -m 644 'faad.man' '/usr/local/share/man/man1/faad.1'

    安装完毕后，查看版本

    1. $ faad -v
    2. faad: error while loading shared libraries: libfaad.so.2: cannot open shared object file: No such file or directory

    竟然提示找不到库，添加库的目录到环境变量

    export LD_LIBRARY_PATH=${LD_LIBRARY_PATH}:/usr/local/lib

    再次执行faad

     faad
    1. lkmao@lkmao-virtual-machine:~/faad2/faad/faad2$ faad
    2.  *********** Ahead Software MPEG-4 AAC Decoder V2.10.0 ******************
    4.  Build: Sep 20 2022
    5.  Copyright 2002-2004: Ahead Software AG
    6.  http://www.audiocoding.com
    7.  bug tracking: https://sourceforge.net/p/faac/bugs/
    8.  Floating point version
    9.  
    10.  This program is free software; you can redistribute it and/or modify
    11.  it under the terms of the GNU General Public License.
    12.  
    13.  **************************************************************************
    15.  
    16. Usage:
    17. faad [options] infile.aac
    18. Options:
    19.  -h    Shows this help screen.
    20.  -i    Shows info about the input file.
    21.  -a X  Write MPEG-4 AAC ADTS output file.
    22.  -t    Assume old ADTS format.
    23.  -o X  Set output filename.
    24.  -f X  Set output format. Valid values for X are:
    25.         1:  Microsoft WAV format (default).
    26.         2:  RAW PCM data.
    27.  -b X  Set output sample format. Valid values for X are:
    28.         1:  16 bit PCM data (default).
    29.         2:  24 bit PCM data.
    30.         3:  32 bit PCM data.
    31.         4:  32 bit floating point data.
    32.         5:  64 bit floating point data.
    33.  -s X  Force the samplerate to X (for RAW files).
    34.  -l X  Set object type. Supported object types:
    35.         1:  Main object type.
    36.         2:  LC (Low Complexity) object type.
    37.         4:  LTP (Long Term Prediction) object type.
    38.         23: LD (Low Delay) object type.
    39.  -d    Down matrix 5.1 to 2 channels
    40.  -w    Write output to stdio instead of a file.
    41.  -g    Disable gapless decoding.
    42.  -q    Quiet - suppresses status messages.
    43.  -j X  Jump - start output X seconds into track (MP4 files only).
    44. Example:
    45.        faad infile.aac
    46.        faad infile.mp4
    47.        faad -o outfile.wav infile.aac
    48.        faad -w infile.aac > outfile.wav
    49.        faad -a outfile.aac infile.aac
    50. lkmao@lkmao-virtual-machine:~/faad2/faad/faad2$

    测试faad命令

    下载测试文件

    wget https://www.nch.com.au/acm/sample.aac

    使用mplayer播放这段音乐

    mplayer sample.aac

    将aac转换成wav，不明白这么做的目的。

    faad -o sample.wav sample.aac
    1. faad -o sample.wav sample.aac 
    2.  *********** Ahead Software MPEG-4 AAC Decoder V2.10.0 ******************
    4.  Build: Sep 20 2022
    5.  Copyright 2002-2004: Ahead Software AG
    6.  http://www.audiocoding.com
    7.  bug tracking: https://sourceforge.net/p/faac/bugs/
    8.  Floating point version
    9.  
    10.  This program is free software; you can redistribute it and/or modify
    11.  it under the terms of the GNU General Public License.
    12.  
    13.  **************************************************************************
    15. sample.aac file info:
    16. ADTS, 4.608 sec, 13 kbps, 16000 Hz
    17.  
    18.   ---------------------
    19.  | Config:  2 Ch       |
    20.   ---------------------
    21.  | Ch |    Position    |
    22.   ---------------------
    23.  | 00 | Left front     |
    24.  | 01 | Right front    |
    25.   ---------------------
    26.  
    27. Decoding sample.aac took:  0.00 sec.  0.00x real-time.

    再播放这段音乐

    mplayer sample.wav

    几乎一样，对比两个文件可以猜出aac是压缩音频，而wav是非压缩音频。faad的作用是音频解压。

    1.  ls -lsh sample.*
    2. 8.0K -rw-rw-r-- 1 lkmao lkmao 7.2K Jun 17  2014 sample.aac
    3. 284K -rw-rw-r-- 1 lkmao lkmao 281K Sep 20 14:59 sample.wav

    总结

            安装完毕后mplayer确实能用了。

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  • 原文地址：https://blog.csdn.net/yueni_zhao/article/details/126952445