linux声卡驱动框架ALSA-Linux音频的移植 qt下音频播放

上文介绍了alsaLinux应用框架图。首先需要对硬件的驱动的移植，alsa库的添加，在该基础上可在Linux上调用命令行gplay-1.0 xxx.mp3播放音频。

驱动的移植参考 zlg的文档

https://manual.zlg.cn/web/#/16?page_id=3823
应用笔记（Linux）/音频使用/移植SGTL5000

按照该文档可进行移植；

FSL_GPLAY_01.00_LINUX build on Nov 28 2019 12:29:30
        [h]display the operation Help
        [p]Play
        [s]Stop
        [e]Seek
        [a]Pause when playing, play when paused
        [v]Volume
        [m]Switch to mute or not
        [>]Play next file
        [<]Play previous file
        [r]Switch to repeated mode or not
        [u]Select the video track
        [d]Select the audio track
        [b]Select the subtitle track
        [f]Set full screen
        [z]resize the width and height
        [t]Rotate
        [c]Setting play rate
        [i]Display the metadata
        [x]eXit

alsa-lib库是用于操作alsa声卡的库，alsa-utils是基于alsa-lib库编写的小工具集合。
　　首先下载 alsa-lib 和 alsa-utils 源码，下载地址为：
　　https://www.alsa-project.org/main/index.php/Main_Page
　
　　
按照zlg的文档可对alsa-lib进行移植

https://manual.zlg.cn/web/#/16?page_id=3840
应用笔记（Linux）/音频使用/基于alsa-lib的wav音频播放器

移植完，查看 alsa库的位置

root@imx6qsabresd:/# pwd
/
root@imx6qsabresd:/# find -name alsa
./usr/share/alsa
./usr/share/sounds/alsa
./usr/include/alsa
./var/lib/alsa
root@imx6qsabresd:/# 

如：
gplay-1.0 --repeat ***.mp3 对该文件重复播放

可输入以下指令进行下一步操作
如：a暂停；在按一次 回复播放
如：s停止；p开始播放；

FSL_GPLAY_01.00_LINUX build on Nov 28 2019 12:29:30
        [h]display the operation Help
        [p]Play
        [s]Stop
        [e]Seek
        [a]Pause when playing, play when paused
        [v]Volume
        [m]Switch to mute or not
        [>]Play next file
        [<]Play previous file
        [r]Switch to repeated mode or not
        [u]Select the video track
        [d]Select the audio track
        [b]Select the subtitle track
        [f]Set full screen
        [z]resize the width and height
        [c]Setting play rate
        [i]Display the metadata
        [x]eXit