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AMIGA OS EMULATOR ONLINE PORTABLE
The portable module seems to cause CPU clock scaling to reduce CPU clock. Maybe Chris Gransden will spot this thread and provide some advice, since he seems to be king of porting apps & games. they have a dedicated audio thread) then that’ll be another potential source of problems (I’m not sure how good the thread scheduler in UnixLib is) Maybe the emulators have buffers as well. I’m not familiar with how the RISC OS version of SDL handles audio – whether it uses an intermediate buffer or not – or exactly how many steps there are between SDL and the OS (I know that UnixLib tends to use the DRenderer module for audio, and that module has had some problems in the past). it needs to stream from disc/network, or it’s being generated by a complex program like an emulator) then the program/player must create and manage an intermediate buffer of its own. I think the Pandaboard ends up with 2.5ms buffers by default, because the default buffer size the OS uses was chosen for 22kHz output, but the lowest rate supported by the Pandaboard is 88kHz.įor audio playback which can’t run from IRQ (e.g. The only thing that will cause hiccups is if something is naughty and disables interrupts for a long period of time, or if a sub-optimal configuration is used. playing a WAV from RAM, or playing a tracker file), and which isn’t too CPU intensive (so it can run in the interrupt handler), RO’s audio is very reliable. So for audio which is deterministic (e.g. Buffer filling is performed from the audio interrupt handler.To minimise latency, the default buffer size is quite small (typically 10ms of data).
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Audio is double-buffered the hardware will be playing from one buffer while the OS is filling the other.The OS takes the following approach to sound: