system toolbox » ubuntu

hernad@nmraka-1:~$ lsusb
Bus 004 Device 003: ID 062a:9004 Creative Labs

https://bugs.launchpad.net/ubuntu/+source/alsa-utils/+bug/116517

static int init_usb_sample_rate(struct usb_device *dev, int iface,
                                struct usb_host_interface *alts,
                                struct audioformat *fmt, int rate)
{
        unsigned int ep;
        unsigned char data[3];
        int err;

        ep = get_endpoint(alts, 0)->bEndpointAddress;
        /* if endpoint has sampling rate control, set it */
        //hernad: comment: if (fmt->attributes & EP_CS_ATTR_SAMPLE_RATE) {
        if (0) {
                int crate;
                data[0] = rate;
                data[1] = rate >> 8;
                data[2] = rate >> 16;
                if ((err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), SET_CUR,
                                           USB_TYPE_CLASS|USB_RECIP_ENDPOINT|USB_DIR_OUT,
                                           SAMPLING_FREQ_CONTROL << 8, ep, data, 3, 1000)) < 0) {
                        snd_printk(KERN_ERR "%d:%d:%d: cannot set freq %d to ep 0x%x\n",
                                   dev->devnum, iface, fmt->altsetting, rate, ep);
                        return err;
                }
                if ((err = snd_usb_ctl_msg(dev, usb_rcvctrlpipe(dev, 0), GET_CUR,
                                           USB_TYPE_CLASS|USB_RECIP_ENDPOINT|USB_DIR_IN,
                                           SAMPLING_FREQ_CONTROL << 8, ep, data, 3, 1000)) < 0) {
                        snd_printk(KERN_WARNING "%d:%d:%d: cannot get freq at ep 0x%x\n",
                                   dev->devnum, iface, fmt->altsetting, ep);
                        return 0; /* some devices don't support reading */
                }
                crate = data[0] | (data[1] << 8) | (data[2] << 16);
                if (crate != rate) {
                        snd_printd(KERN_WARNING "current rate %d is different from the runtime rate %d\n", crate, rate);
                        // runtime->rate = crate;
                }
        }
        return 0;
}

hernad@nmraka-1:/data/home/hernad/devel/ubuntu/hardy$ dpkg-buildpackage -nc
hernad@nmraka-1:/data/home/hernad/devel/ubuntu/hardy$ sudo dpkg -i linux-ubuntu-modules-2.6.24-12-generic_2.6.24-12.17_amd64.deb

hernad@nmraka-1:~$ cat /proc/asound/cards
0 [NVidia ]: HDA-Intel - HDA NVidia
HDA NVidia at 0xf2680000 irq 21
1 [U0x62a0x9004 ]: USB-Audio - USB Device 0x62a:0x9004
USB Device 0x62a:0x9004 at usb-0000:00:04.0-2, full speed

http://defectivecompass.wordpress.com/2007/12/16/pulseaudio-alsa-configuration/

hernad@nmraka-1:~$ cat /proc/asound/cards

 0 [NVidia         ]: HDA-Intel - HDA NVidia
                      HDA NVidia at 0xf2680000 irq 21
 1 [U0x62a0x9004   ]: USB-Audio - USB Device 0x62a:0x9004
                      USB Device 0x62a:0x9004 at usb-0000:00:04.0-2, full speed

  0: [ 0]   : control
  1:        : sequencer
  4: [ 0- 0]: hardware dependent
  5: [ 0- 1]: hardware dependent
 16: [ 0- 0]: digital audio playback
 24: [ 0- 0]: digital audio capture
 32: [ 1]   : control
 33:        : timer
 48: [ 1- 0]: digital audio playback
 56: [ 1- 0]: digital audio capture