If you could document how you figured out the required information and how you used that to write the code, that could be very useful for people reverse engineering other devices in the future. Having 2 USB interfaces is handy by having the second system interface with the second interface, trying to mimic the first.
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With USB disk traffic, playing a song very short with mixxx is about 230MB, while 10MB is usually enough to make wireshark sad.Īlthough I don’t think I have to play a song to get 0x00 out of the audio… Without any usb traffic, turning on and off the SX3 only delivers 6kB worth of data. Unfortunately usbpcap only sees 1 root, so I am now moving audo files from my USB disk to the on board ssd to get a nice capture with mixxx.
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I assume the RE of the windows driver combined with the usb2 sniffer output (or usbpcap) will help me out. The windows driver is 50kB, the OS-X driver kext is about 400kB. USBPcap seems to work, but anyway, the last pieces of my usb2 sniffer arrive this week. So it seems an USB audio driver only needs to support 12 PCM channels, and the remainder is already supported. The block diagram in the manual is not completely correct I think, although it gives me a lot of insights. The device has an analog hardware path, as well as a digital bypass it seems. I assume not all channels are meant to be driven (although USB wise certainly possible). The USB hardware has 12 input and 12 output channels at 24 bit 44.1kHz. Also, I am used to my mapping of the Hercules Universal DJ, so … The SX3 is not really compatible with the SX mapping, although it seems mostly correct, I think it needs fixing as some things are a little different. But the idea of using something like windows already gets me down. So I assume it works out of the box on windows with MIXXX.
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If other people are in on it, it might be worth my while, because writing alsa drivers for an unknown usb protocol might not be that straight forward. So if anyone has suggestions… I’ve got two weekends to decide the long road (making it work), or the easy road (sending it back). But I fear it really probably downloads dsp code to the deck to configure all ins and outs, and it’s API will probably not be easy. Going the long road of writing an alsa driver is tempting. I can sniff that with an external usb sniffer and make that work without windows eventually. I mean, if I need to use windows to download some firmware to the deck and then it will magically have PCM, that’s fine by me. I mean, I will succeed into installing windows.
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Can someone confirm that? And what are the differences in features? I like that this deck has 4 analog inputs for mixing, as professionally I really need an audio mixer to test all my targets.ĭid I do something wrong, is there some kind of configuration that makes a PCM magically appear? I have not tried windows, as I have no clue how to reinstall windows on my GPD WIN2. I was under the impression that both the SX and SX2 are fully usb class, and work fully under linux. It instead has 2 vendor specific endpoints of which one is ISO. I’ve bought the DDJ SX3 (from a webshop so I can still return it), but I noticed that the Pioneer only has midi usb class, and no audio usb class.