Project: S.E.A.L. for OS/2

The DLL included can be used to add OS/2 native support for playing module files and streamed audio to OS/2 Presentation Manager (PM) and VIO applications. It can also be used to assist in the porting of other DOS, Windows, and Linux applications that also use the SEAL API. SEAL is also supporting the OS/2 DART interface.

To build applications with the SEAL library, simply link them with the AUDIO.LIB file and include the AUDIO.H file in your programs.

The standard SEAL documentation covers the usage of the standard SEAL API. There are a few additional considerations in using the OS/2 version:
  • The OS/2 version is multithreaded. This means that the SEAL library is updating the audio buffers in the background while the rest of your application is running. Unlike the DOS and Windows versions, you do not have to call the AUpdateAudio function to update the audio buffers. This also means that some care needs to be taken when updating the voices and sound buffers yourself. It is recommended that you use DosEnterCritSec and DosExitCritSec around areas where voices are created and destroyed.
  • Some of the SEAL API functions require other threads to be running when they are called. If you are in a critical section when you call some functions, it can cause deadlock because the critical section prevents other threads in the same task from running. Do not call the following functions in a critical section: AOpenAudio, ACloseAudio, AUpdateAudio.
  • The AUpdateAudio function was implemented, but not to update the audio. It was made to be a means of synchronizing your application with the audio stream. When you call AUpdateAudio, the calling thread will block until an audio buffer needs more data. For a good example of how to use this function and the rest of the SEAL API, ask me for the source code for MAME for OS/2. E-mail me (Marty Amodeo)

There are no known OS/2 specific bugs at this time.

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