User-created sounds not playing in FMOD with pthreads

FMOD Engine
1

I’m trying to set up the pthread-enabled wasm port. Everything seems alright, except sounds that are played by programmer sounds are silent. Swapping fmodstudioPL.js with fmodstudioL.js makes all sounds audible.

All sounds are loaded without the nonblocking flag. The exact same code works with the single-threaded version, and is silent with the pthread version.

Sounds doesn’t sound like a word anymore.

Is there something different about how programmer sounds are created with multiple threads?

Thanks :slight_smile:

2

This is not documented well in FMOD 2.3. Im attaching a section from the upcoming revamped HTML5 release in 2.4. Your relevant entry is the FMOD_STUDIO_EVENT_CALLBACK section.

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The ‘P’ versions of the FMOD libraries support threaded mixing, streaming and FMOD_NONBLOCKING support.

An important limitation to note is that user callbacks will not fire from a pthread, as JavaScript objects cannot be shared between threads.
The table below lists if certain callbacks are supported at all, and if they are, conditions with different types of callbacks are marked with a ? in the ‘Note’ column.

Callback Support Note
FMOD_3D_ROLLOFF_CALLBACK No Not supported
FMOD_CHANNELCONTROL_CALLBACK Yes Called from System::update
FMOD_DEBUG_CALLBACK No Called from multiple threads
FMOD_DSP_CALLBACK No Not supported
DSP plug-in API callbacks ? Must use FMOD_OUTPUTTYPE_AUDIOWORKLET or FMOD_OUTPUTTYPE_WEBAUDIO over FMOD_OUTPUTTYPE_AUDIOWORKLETP. Called from System::update
FMOD_FILE_OPEN_CALLBACK
FMOD_FILE_CLOSE_CALLBACK
FMOD_FILE_READ_CALLBACK
FMOD_FILE_SEEK_CALLBACK.		 ? Core API: Must not use FMOD_NONBLOCKING. FMOD_CREATESTREAM must use FMOD_INIT_STREAM_FROM_UPDATE.
Studio API: You must use FMOD_STUDIO_INIT_LOAD_FROM_UPDATE with FMOD_STUDIO_INIT_SYNCHRONOUS_UPDATE.
FMOD_FILE_ASYNCREAD_CALLBACK
FMOD_FILE_ASYNCCANCEL_CALLBACK		 No Not supported
FMOD_MEMORY_ALLOC_CALLBACK
FMOD_MEMORY_REALLOC_CALLBACK
FMOD_MEMORY_FREE_CALLBACK		 No Called from multiple threads
FMOD_SOUND_NONBLOCK_CALLBACK No Not supported
FMOD_SOUND_PCMREAD_CALLBACK
FMOD_SOUND_PCMSETPOS_CALLBACK		 ? FMOD_CREATESTREAM must use FMOD_INIT_STREAM_FROM_UPDATE
FMOD_SYSTEM_CALLBACK No Not supported
FMOD_STUDIO_SYSTEM_CALLBACK ? Must use FMOD_STUDIO_INIT_SYNCHRONOUS_UPDATE
FMOD_STUDIO_EVENT_CALLBACK ? Timeline callbacks must use FMOD_STUDIO_INIT_DEFERRED_CALLBACKS
FMOD_STUDIO_COMMANDREPLAY_FRAME_CALLBACK
FMOD_STUDIO_COMMANDREPLAY_LOAD_BANK_CALLBACK
FMOD_STUDIO_COMMANDREPLAY_CREATE_INSTANCE_CALLBACK		 No Not supported