* Fix counting the total_bytes counter, RealPlayer G2 depends on it. Should probably maintain * the ISO datastream even if there's nothing to play. Don't try to listen to it using * decent headphones! * 'Let's make things better' -> but please Philips start with your * own stuff!!!! * : Thomas Sailer * It takes the Philips boxes several seconds to acquire synchronisation * that means they won't play short sounds. * Unbelievably, the Philips USB DAC has a sampling rate range * of over a decade, yet does not support the sampling rate control! * No wonder it sounds so bad, has very audible sampling rate * conversion distortion. * : Thomas Sailer * Audio can now be unloaded if it is not in use by any mixer * or dsp client (formerly you had to disconnect the audio devices * from the USB port) * Finally, about three months after ordering, my 'Maxxtro SPK222' * speakers arrived, isn't disdata a great mail order company 8-) * Parse class specific endpoint descriptor of the audiostreaming * interfaces and take the endpoint attributes from there.

* Now runs stable on UHCI-Acher/Fliegl/Sailer. Fixed a taskstate/wakeup semantics mistake * that made the driver consume all available CPU cycles. * : Thomas Sailer * Converted to URB API. We can therefore * now have multiple mixer/wave devices per USB device. usb_audio_state now basically * only contains lists of mixer and wave devices. * First stab at synch pipe implementation, the Dallas USB DAC * wants to use an Asynch out pipe. Mixer parsing untested, due to lack of device. * You cannot reasonnably linearly parse audio descriptors, * especially the AudioClass descriptors have to be considered * pointer lists. * : Thomas Sailer * Threw out Alan's parsing code and implemented my own one. * The parsing code seems to have its problems btw, * Since it parses all available configs but doesn't * store which iface/altsetting belongs to which config. * Still not properly glued with the parsing code. * * : Alan Cox * Parsing Audio descriptor patch * : Thomas Sailer * Added OSS compatible data io functions both parts of the * driver remain to be glued together * : Thomas Sailer * Beautified the driver. * * Debugging: * Use the 'lsusb' utility to dump the descriptors. *****************************************************************************/ /* * audio.c - USB Audio Class driver * *Ĝopyright (C) 1999, 2000, 2001, 2003, 2004 * Alan Cox * Thomas Sailer * * This program is free software you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation either version 2 of the License, or * (at your option) any later version.

Generic usb audio driver linux