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android - Libusb Isochronous Audio Transfer - Stack …
https://stackoverflow.com/questions/29753066/libusb-isochronous-audio-transfer
Libusb Isochronous Audio Transfer. Ask Question Asked 6 years, 9 months ago. Active 6 years, 9 months ago. Viewed 797 times 1 1. I'm currently developing an Android app using libusb at C++ side via JNI. I've been doing a really deep research about USB Audio Class and libusb. I've read almost every documentation and seen every bit of example ...
Re: [libusb] performance penalty of audio isochronous ...
https://sourceforge.net/p/libusb/mailman/message/36081035/
This sequencing takes couple of milliseconds. In the meantime, the computer will likely start sending audio quadrature data to the transmit hardware. When the operator releases the morse key, a reverse process is going on: 1) The "key up" event is sent over USB to the computer. 2) The computer gives a command back to the hardware to switch to ...
libusb / Thread: isochronous transfers
https://sourceforge.net/p/libusb/mailman/libusb-devel/thread/4FAAD15C.9060601%40probo.com/
I'm attempting to use libusb-1.0 to stream IPOD audio data from an isochronous endpoint. The packet size used is 16 for each transfer & am receiving the valid actual length & but data is NULL. But some of the packets contain the data. With same piece of data, I can able to stream the IPOD using libusb in ubuntu10.4.
libusb / Re: [libusb] performance penalty of audio ...
https://sourceforge.net/p/libusb/mailman/message/36078709/
Re: [libusb] performance penalty of audio isochronous transfer over libusb? bubnikv . wrote: > > As a hobby project, I am developing a program for a software defined > radio. The hardware implements a composite USB device with Audio Class > isochronous input and output. There are following reasons I want to > access the USB audio class device ...
Issues trying to setup isochronous transfer in soundcard ...
https://libusb-devel.narkive.com/oB7NFfvJ/issues-trying-to-setup-isochronous-transfer-in-soundcard-with-a-ti-pcm2906c
I'm working with USB audio I/O in Android. Android does not support USB audio recording. so I managed to make it work through a libusb implementation in C (NDK). After a few months of working on it now it's sounding well with good audio quality. Unluckily for me, the chipset our soundcard has been discontinued and so we switched to a Texas ...
libusb and isochronous transfer | Microchip
https://www.microchip.com/forums/m417928-p2.aspx
On the other hand, the new libusb 1.0 Windows backend provides good alternative to libusb-win32 since it provides good documentation on asynchronous API. Unfortunately the current Windows backends (WinUSB and HID) do not support isochronous transfer. So we will have to wait for that to happen.
libusb
Overview libusb is a C library that provides generic access to USB devices. It is intended to be used by developers to facilitate the production of applications that communicate with USB hardware. It is portable: Using a single cross-platform API, it provides access to USB devices on Linux, macOS, Windows, etc.
libusb: USB descriptors - University of New Mexico
https://www.cs.unm.edu/~hjelmn/libusb_hotplug_api/group__desc.html
LIBUSB_CLASS_PER_INTERFACE : In the context of a device descriptor, this bDeviceClass value indicates that each interface specifies its own class information and all interfaces operate independently.. LIBUSB_CLASS_AUDIO : Audio class. LIBUSB_CLASS_COMM : Communications class. LIBUSB_CLASS_HID : Human Interface Device class.
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