DSP: Copy audio dma samples one block at a time #10741
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Also fixes https://bugs.dolphin-emu.org/issues/9410 or at least the audio crackling doesn't happen anymore. The previous PR (#10738) didn't change the behaviour. |
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Can we get a review here of someone who's familiar with the DSP/Audio stuff? |
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Reverts 9f8e1e2, but keeps the changes from e4e4490. This fixes missing audio in Datel titles; see https://bugs.dolphin-emu.org/issues/12281.
`count` is the number of stereo samples to write (where each stereo sample is two shorts), while `BUFFER_SIZE` is the size of the buffer in shorts. So `count` needs to be multiplied by `2`, not `BUFFER_SIZE`. Also, when this check was failed, the previous code just clobbered whatever was past the end of the buffer after logging the warning, which corrupted `basename`, eventually resulting in Dolphin crashing. This affected Datel's Wii-compatible Action Replay, which uses a block size of 2298, or 18384 stereo samples, which is 36768 shorts, which is bigger than the buffer size of 32768. (However, the previous commit means that only one block is transfered at a time, eliminating this issue; fixing the bounds check is just a general safety thing instead of an actual bugfix now.)
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If this breaks audio, let it be known that I showed restraint and gave people months to review it before deciding that my shitty unlicensed games needed some love. |
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This fixes missing audio in various Datel titles; see https://bugs.dolphin-emu.org/issues/12281. They send a large number of samples at the same time, since they don't have to deal with an actual DSP program generating them. Before, we were sending all of the samples at once, which would be too large to ever fit in the buffer in
Mixer.cppand thus the code that prevents overflowing the buffer rejected the samples. This new approach should be more hardware-accurate, though I haven't done any testing related to it.Compared to #10738, this change does not result in audio desyncs after pressing tab to disable the speed limit, and I never encountered any duplicated sound effects on Datel titles.
This PR reverts #720 (but it keeps the length 0 change from #762). Other PRs that are good for context are #692 and #762. I don't own Xenoblade Chronicles, so I haven't confirmed whether this causes issues for it.
This PR also fixes a broken size check in
WaveFile. That check used to be relevant for the Wii-compatible Action Replay (which would crash Dolphin if audio dumping was enabled), but the other change in this PR means that only 8 samples at a time are getting written. Still, it's better to fix it.