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Discuss Mikhail Tkach's InfoNES port
criznach:
--- Quote from: MikeT on October 09, 2007, 08:45:32 PM ---No, no working sound unfortunately.
--- End quote ---
I downloaded your broken sound files and discovered a few clues...
First, the performance hit from sound isn't as big as I thought, because if I turn on the mute flag to prevent InfoNES_pAPUVsync from being called, the framerate doesn't increase by much. I guess profiling a windows build of InfoNES isn't going to give me very useful data.
It looks like rockbox's pcm_play_data function is expecting stereo samples, while infones is feeding it mono samples. So I tried doubling the final buffer and writing each byte twice. I then pass pcm_play_data samples*2 as it's length parameter. This makes the sound almost tolerable. It's still very chunky and not pleasant. But it sounds a bit more like what I expect :) I thought changing the pAPU_QUALITY define and the sample rate would improve the performance, but something isn't right when I do that.
criznach:
I just noticed that the InfoNES_Wait function is empty in the system_rockbox code. That normally regulates the frame skipping and times the sound buffers to prevent skipping. I think implementing that using another platform as a model will even things out. Look at the windows src for a good example. On windows the timer runs in the UI thread and the emu thread checks a flag. On rockbox, we could put the timer in a thread or if there are other benefits, put the emu in another thread. Looks like multi-core firmware is just about ready to tinker with :)
MikeT: have you been able to work on the InfoNes lately?
Chronon:
criznach, please "modify" your posts instead of double posting.
MikeT:
--- Quote from: criznach on October 16, 2007, 02:00:18 PM ---
MikeT: have you been able to work on the InfoNes lately?
--- End quote ---
I've been wrecking my brains out trying to understand why sim build was acting so strangely. Turns out I forgot rb->yield(). So I've been working on it but haven't got much done.
criznach:
--- Quote from: Chronon on October 16, 2007, 02:05:33 PM ---criznach, please "modify" your posts instead of double posting.
--- End quote ---
Oops - what did I double post?
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