alsaplayer-oss software package provides alsaplayer output module for OSS, you can install in your Debian 9 (Stretch) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install alsaplayer-oss
alsaplayer-oss is installed in your system.
Make ensure the alsaplayer-oss package were installed using the commands given below,
$ sudo dpkg-query -l | grep alsaplayer-oss *
You will get with alsaplayer-oss package name, version, architecture and description in a table
| Distro | Debian 9 stretch |
| Section | Sound |
| Package | alsaplayer-oss |
| Version | 0.99.81-1+b3 [mips, mipsel], 0 |
| Description | alsaplayer output module for OSS |
| Sub Section | Sound |