None of the necessary bits are exposed to Python, so you'd have to fork Pygame probably. It might be possible to open a PR to add the feature though.
On Wed, Jul 14, 2021, 18:41 Andrew Baker <failr...@gmail.com> wrote: > I'd assume that deep under the hood, one should be able to advance > whatever read pointer to the soundbuffer is used by the channel. > > Is that correct? > > > On Wed, Jul 14, 2021, 15:51 Jasper Phillips <jasperisja...@gmail.com> > wrote: > >> Thanks Daniel, that works! Plus using soundarray should be faster than >> first converting to raw. >> >> So far I don't need to cache, but rollback netcode demands lots of CPU so >> I suspect I probably will end up optimizing this to improve robustness vs >> lag. >> >> A pity mixer won't let you start Channels partway through a Sound, as >> then there'd be no CPU cost. >> >> On Wed, Jul 14, 2021 at 9:15 AM Daniel Foerster <pydsig...@gmail.com> >> wrote: >> >>> Instead of using the raw sound binary data and winging the slice, I'd >>> recommend throwing things into a sndarray. >>> >>> >>> def clip_sound(sound, start_time): >>> freq = pygame.mixer.get_init()[0] >>> offset = round(freq * start_time) >>> arr = pygame.sndarray.array(sound) >>> clipped = arr[offset:] >>> return pygame.sndarray.make_sound(clipped) >>> >>> >>> It would be worthwhile probably to cache the frequency and the converted >>> array and only do the slice + flip back to Sound but that's premature >>> optimization right now. >>> >>> On Wed, Jul 14, 2021, 03:15 Jasper Phillips <jasperisja...@gmail.com> >>> wrote: >>> >>>> Alas, that is precisely what I did: >>>> >>>> def clipEffect( effect, startTime ): >>>> raw = effect.get_raw() >>>> rawStart = int( len(raw) * startTime / effect.get_length() ) >>>> return mixer.Sound( raw[rawStart:] ) >>>> >>>> Depending on what sound effect I play the code either: >>>> - Works fine! >>>> - Horribly distorts the audio, though the original Sound plays fine... >>>> >>>> Hi Jasper. Try the fourth answer here >>>>> <https://stackoverflow.com/questions/57960451/how-can-i-play-a-portion-of-an-audio-file-in-a-loop-in-pygame>, >>>>> by Ted Klein Bergman. >>>>> On 7/13/2021 4:24 PM, Jasper Phillips wrote: >>>>> >>>>> I'm working on a networked action game with rollback netcode, and so I >>>>> need to play sound effects starting an arbitrary amount of time from the >>>>> beginning of the file so they sync up with game events. >>>>> >>>>> pygame.mixer.music does this via set_pos()... but apparently there's >>>>> no corresponding method when playing effects directly via a Channel. >>>>> Unfortunate, as I need to use Channels! >>>>> >>>>> The best I've come up with is to use Sound.get_raw(), trim the >>>>> starting bytes off then, create a new Sound. But this fails several >>>>> different ways, I'm guessing because I'm arbitrarily slicing the bytes and >>>>> there's some format details I don't know. >>>>> >>>>> >>>>> Does anyone have any tips for hacking raw Sound data, or perhaps some >>>>> better approach? >>>>> >>>>> -Jasper >>>>> >>>>>
