%T#13985 Comment added by amachronic: iAP PCM audio fails on Designware (iPod Classic + Eros Q) USB targets
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THIS IS AN AUTOMATED MESSAGE, DO NOT REPLY. The following task has a new comment added: FS#13985 - iAP PCM audio fails on Designware (iPod Classic + Eros Q) USB targets User who did this - Aidan MacDonald (amachronic) ---------- I suspect this is due to the problems inherent to doing USB transfers 1000 times a second in software. On the ARC controller mojyack used multiple DMA descriptors to allow buffering 16ms ahead, and refills the buffer from the USB interrupt handlers. On DWC we're doing one packet at a time and potentially going back and forth with threads which is going to perform a lot worse. There's no reason we can't do the same buffering strategy with the DWC using its scatter/gather DMA feature (assuming it's implemented on the SoC; it's optional, so not all SoCs may have it) but someone will have to implement it. ---------- More information can be found at the following URL: https://www.rockbox.org/tracker/task/13985#comment45689 You are receiving this message because you have requested it from the Flyspray bugtracking system. If you did not expect this message or don't want to receive mails in future, you can change your notification settings at the URL shown above. -- rockbox-sf mailing list [email protected] https://lists.haxx.se/mailman/listinfo/rockbox-sf