Hi all,
I've just bought a low cost USB audio device. For about ?45 the
device sports two optical SPDIF (=toslink) connectors (one in, one
out) clocking at 32kHz, 44.1kHz or 48kHz. According to the specs it's
USB 1.1 and USB audio 1.1 compliant. It is assembled and branded by
ABIT, model UA-11, the "i/Optica".
The audio module loads with these messages:
usb.c: registered new driver audio
usbaudio: device 2 audiocontrol interface 0 has 1 input and 1 output AudioStreaming interfaces
usbaudio: valid input sample rate 48000
usbaudio: valid input sample rate 32000
usbaudio: valid input sample rate 44100
usbaudio: device 2 interface 2 altsetting 1: format 0x00000010 sratelo 32000 sratehi 48000 attributes 0x01
usbaudio: valid input sample rate 48000
usbaudio: valid input sample rate 32000
usbaudio: valid input sample rate 44100
usbaudio: device 2 interface 2 altsetting 2: format 0x80000010 sratelo 32000 sratehi 48000 attributes 0x01
usbaudio: device 2 interface 1 altsetting 0 does not have an endpoint
usbaudio: valid output sample rate 48000
usbaudio: valid output sample rate 32000
usbaudio: valid output sample rate 44100
usbaudio: device 2 interface 1 altsetting 1: format 0x00000010 sratelo 32000 sratehi 48000 attributes 0x01
usbaudio: valid output sample rate 48000
usbaudio: valid output sample rate 32000
usbaudio: valid output sample rate 44100
usbaudio: device 2 interface 1 altsetting 2: format 0x80000010 sratelo 32000 sratehi 48000 attributes 0x01
usbaudio: registered dsp 14,19
usbaudio: constructing mixer for Terminal 10 type 0x0301
usbaudio: unit 8: invalid PROCESSING_UNIT descriptor
usbaudio: feature unit 9 source has no channels
usbaudio: no mixer controls found for Terminal 10
usbaudio: constructing mixer for Terminal 13 type 0x0101
usbaudio: selector unit 11: ignoring channel 1
usbaudio: selector unit 11: input pins with varying channel numbers
usbaudio: feature unit 12 source has no channels
usbaudio: no mixer controls found for Terminal 13
usb_audio_parsecontrol: usb_audio_state at d2bb6480
audio.c: v1.0.0:USB Audio Class driver
usb.c: registered new driver hiddev
usb.c: registered new driver hid
input0: USB HID v1.00 Pointer [KC Technology, Inc. KC USB Audio Device] on usb1:2.3
hid-core.c: v1.8 Andreas Gal, Vojtech Pavlik <[email protected]>
hid-core.c: USB HID support drivers
The output from `lsusb' is a monster:
Bus 001 Device 001: ID 0000:0000 Virtual Hub
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 1.00
bDeviceClass 9 Hub
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 8
idVendor 0x0000 Virtual
idProduct 0x0000 Hub
bcdDevice 0.00
iManufacturer 0
iProduct 2 USB UHCI-alt Root Hub
iSerial 1 cce0
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 25
bNumInterfaces 1
bConfigurationValue 1
iConfiguration 0
bmAttributes 0x40
Self Powered
MaxPower 0mA
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 1
bInterfaceClass 9 Hub
bInterfaceSubClass 0
bInterfaceProtocol 0
iInterface 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type none
wMaxPacketSize 8
bInterval 255
Language IDs: (length=4)
0000 (null)((null))
Bus 001 Device 002: ID 050f:2178 KC Technology Inc.
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 1.10
bDeviceClass 0 Interface
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 8
idVendor 0x050f KC Technology Inc.
idProduct 0x2178
bcdDevice 1.00
iManufacturer 1 KC Technology, Inc.
iProduct 2 KC USB Audio Device
iSerial 0
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 421
bNumInterfaces 4
bConfigurationValue 1
iConfiguration 0
bmAttributes 0x80
MaxPower 300mA
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 0
bInterfaceClass 1 Audio
bInterfaceSubClass 1 Control Device
bInterfaceProtocol 0
iInterface 0
AudioControl Interface Descriptor:
bLength 10
bDescriptorType 36
bDescriptorSubtype 1 (HEADER)
bcdADC 1.00
wTotalLength 164
bInCollection 2
baInterfaceNr( 0) 1
baInterfaceNr( 1) 2
AudioControl Interface Descriptor:
bLength 12
bDescriptorType 36
bDescriptorSubtype 2 (INPUT_TERMINAL)
bTerminalID 1
wTerminalType 0x0101 USB Streaming
bAssocTerminal 0
bNrChannels 2
wChannelConfig 0x0003
Left Front (L)
Right Front (R)
iChannelNames 0
iTerminal 0
AudioControl Interface Descriptor:
bLength 12
bDescriptorType 36
bDescriptorSubtype 2 (INPUT_TERMINAL)
bTerminalID 2
wTerminalType 0x0603 Line Connector
bAssocTerminal 0
bNrChannels 2
wChannelConfig 0x0003
Left Front (L)
Right Front (R)
iChannelNames 0
iTerminal 0
AudioControl Interface Descriptor:
bLength 12
bDescriptorType 36
bDescriptorSubtype 2 (INPUT_TERMINAL)
bTerminalID 3
wTerminalType 0x0201 Microphone
bAssocTerminal 0
bNrChannels 1
wChannelConfig 0x0001
Left Front (L)
iChannelNames 0
iTerminal 0
AudioControl Interface Descriptor:
bLength 9
bDescriptorType 36
bDescriptorSubtype 3 (OUTPUT_TERMINAL)
bTerminalID 10
wTerminalType 0x0301 Speaker
bAssocTerminal 0
bSourceID 9
iTerminal 0
AudioControl Interface Descriptor:
bLength 9
bDescriptorType 36
bDescriptorSubtype 3 (OUTPUT_TERMINAL)
bTerminalID 13
wTerminalType 0x0101 USB Streaming
bAssocTerminal 0
bSourceID 12
iTerminal 0
AudioControl Interface Descriptor:
bLength 14
bDescriptorType 36
bDescriptorSubtype 4 (MIXER_UNIT)
bUnitID 7
bNrInPins 3
baSourceID( 0) 4
baSourceID( 1) 5
baSourceID( 2) 6
bNrChannels 2
wChannelConfig 0x0003
Left Front (L)
Right Front (R)
iChannelNames 0
bmControls 0x00
iMixer 0
AudioControl Interface Descriptor:
bLength 9
bDescriptorType 36
bDescriptorSubtype 5 (SELECTOR_UNIT)
bUnitID 11
bNrInPins 3
baSource( 0) 2
baSource( 1) 3
baSource( 2) 7
iSelector 0
AudioControl Interface Descriptor:
bLength 13
bDescriptorType 36
bDescriptorSubtype 6 (FEATURE_UNIT)
bUnitID 4
bSourceID 1
bControlSize 2
bmaControls( 0) 0x01
bmaControls( 1) 0x00
Mute
bmaControls( 0) 0x02
bmaControls( 1) 0x00
Volume
bmaControls( 0) 0x02
bmaControls( 1) 0x00
Volume
iFeature 0
AudioControl Interface Descriptor:
bLength 13
bDescriptorType 36
bDescriptorSubtype 6 (FEATURE_UNIT)
bUnitID 5
bSourceID 2
bControlSize 2
bmaControls( 0) 0x01
bmaControls( 1) 0x00
Mute
bmaControls( 0) 0x02
bmaControls( 1) 0x00
Volume
bmaControls( 0) 0x02
bmaControls( 1) 0x00
Volume
iFeature 0
AudioControl Interface Descriptor:
bLength 9
bDescriptorType 36
bDescriptorSubtype 6 (FEATURE_UNIT)
bUnitID 6
bSourceID 3
bControlSize 2
bmaControls( 0) 0x43
bmaControls( 1) 0x00
Mute
Volume
Automatic Gain
iFeature 0
AudioControl Interface Descriptor:
bLength 13
bDescriptorType 36
bDescriptorSubtype 6 (FEATURE_UNIT)
bUnitID 9
bSourceID 8
bControlSize 2
bmaControls( 0) 0x01
bmaControls( 1) 0x00
Mute
bmaControls( 0) 0x02
bmaControls( 1) 0x00
Volume
bmaControls( 0) 0x02
bmaControls( 1) 0x00
Volume
iFeature 0
AudioControl Interface Descriptor:
bLength 13
bDescriptorType 36
bDescriptorSubtype 6 (FEATURE_UNIT)
bUnitID 12
bSourceID 11
bControlSize 2
bmaControls( 0) 0x01
bmaControls( 1) 0x00
Mute
bmaControls( 0) 0x02
bmaControls( 1) 0x00
Volume
bmaControls( 0) 0x02
bmaControls( 1) 0x00
Volume
iFeature 0
AudioControl Interface Descriptor:
bLength 16
bDescriptorType 36
bDescriptorSubtype 7 (PROCESSING_UNIT)
bUnitID 8
wProcessType 3
bNrPins 1
baSourceID( 0) 7
bNrChannels 2
wChannelConfig 0x0003
Left Front (L)
Right Front (R)
iChannelNames 0
bControlSize 2
bmControls( 0) 0x03
bmControls( 1) 0x00
Enable Processing
iProcessing 0
Process-Specific
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 1
bAlternateSetting 0
bNumEndpoints 0
bInterfaceClass 1 Audio
bInterfaceSubClass 2 Streaming
bInterfaceProtocol 0
iInterface 0
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 1
bAlternateSetting 1
bNumEndpoints 1
bInterfaceClass 1 Audio
bInterfaceSubClass 2 Streaming
bInterfaceProtocol 0
iInterface 0
AudioControl Interface Descriptor:
bLength 7
bDescriptorType 36
bDescriptorSubtype 1 (AS_GENERAL)
bTerminalLink 1
bDelay 1 frames
wFormatTag 1 PCM
AudioControl Interface Descriptor:
bLength 17
bDescriptorType 36
bDescriptorSubtype 2 (FORMAT_TYPE)
bFormatType 1 (FORMAT_TYPE_I)
bNrChannels 1
bSubframeSize 2
bBitResolution 16
bSamFreqType 3 Discrete
tSamFreq[ 0] 48000
tSamFreq[ 1] 44100
tSamFreq[ 2] 32000
Endpoint Descriptor:
bLength 9
bDescriptorType 5
bEndpointAddress 0x02 EP 2 OUT
bmAttributes 9
Transfer Type Isochronous
Synch Type Adaptive
wMaxPacketSize 104
bInterval 1
bRefresh 0
bSynchAddress 0
AudioControl Endpoint Descriptor:
bLength 7
bDescriptorType 37
bDescriptorSubtype 1 (EP_GENERAL)
bmAttributes 0x01
Sampling Frequency
bLockDelayUnits 2 Decoded PCM samples
wLockDelay 512 Decoded PCM samples
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 1
bAlternateSetting 2
bNumEndpoints 1
bInterfaceClass 1 Audio
bInterfaceSubClass 2 Streaming
bInterfaceProtocol 0
iInterface 0
AudioControl Interface Descriptor:
bLength 7
bDescriptorType 36
bDescriptorSubtype 1 (AS_GENERAL)
bTerminalLink 1
bDelay 1 frames
wFormatTag 1 PCM
AudioControl Interface Descriptor:
bLength 17
bDescriptorType 36
bDescriptorSubtype 2 (FORMAT_TYPE)
bFormatType 1 (FORMAT_TYPE_I)
bNrChannels 2
bSubframeSize 2
bBitResolution 16
bSamFreqType 3 Discrete
tSamFreq[ 0] 48000
tSamFreq[ 1] 44100
tSamFreq[ 2] 32000
Endpoint Descriptor:
bLength 9
bDescriptorType 5
bEndpointAddress 0x02 EP 2 OUT
bmAttributes 9
Transfer Type Isochronous
Synch Type Adaptive
wMaxPacketSize 208
bInterval 1
bRefresh 0
bSynchAddress 0
AudioControl Endpoint Descriptor:
bLength 7
bDescriptorType 37
bDescriptorSubtype 1 (EP_GENERAL)
bmAttributes 0x01
Sampling Frequency
bLockDelayUnits 2 Decoded PCM samples
wLockDelay 512 Decoded PCM samples
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 2
bAlternateSetting 0
bNumEndpoints 0
bInterfaceClass 1 Audio
bInterfaceSubClass 2 Streaming
bInterfaceProtocol 0
iInterface 0
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 2
bAlternateSetting 1
bNumEndpoints 1
bInterfaceClass 1 Audio
bInterfaceSubClass 2 Streaming
bInterfaceProtocol 0
iInterface 0
AudioControl Interface Descriptor:
bLength 7
bDescriptorType 36
bDescriptorSubtype 1 (AS_GENERAL)
bTerminalLink 13
bDelay 1 frames
wFormatTag 1 PCM
AudioControl Interface Descriptor:
bLength 17
bDescriptorType 36
bDescriptorSubtype 2 (FORMAT_TYPE)
bFormatType 1 (FORMAT_TYPE_I)
bNrChannels 1
bSubframeSize 2
bBitResolution 16
bSamFreqType 3 Discrete
tSamFreq[ 0] 48000
tSamFreq[ 1] 44100
tSamFreq[ 2] 32000
Endpoint Descriptor:
bLength 9
bDescriptorType 5
bEndpointAddress 0x83 EP 3 IN
bmAttributes 5
Transfer Type Isochronous
Synch Type Asynchronous
wMaxPacketSize 104
bInterval 1
bRefresh 0
bSynchAddress 0
AudioControl Endpoint Descriptor:
bLength 7
bDescriptorType 37
bDescriptorSubtype 1 (EP_GENERAL)
bmAttributes 0x01
Sampling Frequency
bLockDelayUnits 2 Decoded PCM samples
wLockDelay 0 Decoded PCM samples
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 2
bAlternateSetting 2
bNumEndpoints 1
bInterfaceClass 1 Audio
bInterfaceSubClass 2 Streaming
bInterfaceProtocol 0
iInterface 0
AudioControl Interface Descriptor:
bLength 7
bDescriptorType 36
bDescriptorSubtype 1 (AS_GENERAL)
bTerminalLink 13
bDelay 1 frames
wFormatTag 1 PCM
AudioControl Interface Descriptor:
bLength 17
bDescriptorType 36
bDescriptorSubtype 2 (FORMAT_TYPE)
bFormatType 1 (FORMAT_TYPE_I)
bNrChannels 2
bSubframeSize 2
bBitResolution 16
bSamFreqType 3 Discrete
tSamFreq[ 0] 48000
tSamFreq[ 1] 44100
tSamFreq[ 2] 32000
Endpoint Descriptor:
bLength 9
bDescriptorType 5
bEndpointAddress 0x83 EP 3 IN
bmAttributes 5
Transfer Type Isochronous
Synch Type Asynchronous
wMaxPacketSize 208
bInterval 1
bRefresh 0
bSynchAddress 0
AudioControl Endpoint Descriptor:
bLength 7
bDescriptorType 37
bDescriptorSubtype 1 (EP_GENERAL)
bmAttributes 0x01
Sampling Frequency
bLockDelayUnits 2 Decoded PCM samples
wLockDelay 0 Decoded PCM samples
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 3
bAlternateSetting 0
bNumEndpoints 1
bInterfaceClass 3 Human Interface Devices
bInterfaceSubClass 0 No Subclass
bInterfaceProtocol 0 None
iInterface 0
HID Device Descriptor:
bLength 9
bDescriptorType 33
bcdHID 1.00
bCountryCode 0
bNumDescriptors 1
bDescriptorType 34 Report
wDescriptorLength 152
cannot get report descriptor
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type none
wMaxPacketSize 8
bInterval 48
Language IDs: (length=4)
0409 English(US)
Here's some strace() output from sox:
[pid 1892] open("/dev/dsp1", O_WRONLY|O_CREAT|O_TRUNC, 0666) = 4
[pid 1892] fstat64(4, {st_mode=S_IFCHR|0660, st_rdev=makedev(14, 19), ...}) = 0
[pid 1892] ioctl(4, SNDCTL_TMR_TIMEBASE, 0xbffffaa8) = -1 ENOIOCTLCMD (errno 515)
[pid 1892] old_mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x40017000
[pid 1892] fstat64(4, {st_mode=S_IFCHR|0660, st_rdev=makedev(14, 19), ...}) = 0
[pid 1892] ioctl(4, SNDCTL_DSP_RESET, 0) = 0
[pid 1892] ioctl(4, SNDCTL_DSP_SYNC, 0) = 0
[pid 1892] ioctl(4, SNDCTL_DSP_GETFMTS, 0xbffffc04) = 0
[pid 1892] ioctl(4, SOUND_PCM_READ_BITS, 0xbffffc04) = 0
[pid 1892] ioctl(4, SNDCTL_DSP_STEREO, 0xbffffc04) = 0
[pid 1892] ioctl(4, SOUND_PCM_READ_RATE, 0xbffffc04) = 0
[pid 1892] write(2, "sox: ", 5sox: ) = 5
[pid 1892] write(2, "Unable to set audio speed to 441"..., 45Unable to set audio speed to 44100 (set to 0)) = 45
[pid 1892] write(2, "\n", 1
) = 1
[pid 1892] ioctl(4, SNDCTL_DSP_GETBLKSIZE, 0x80a52f0) = 0
[pid 1892] munmap(0x40017000, 4096) = 0
[pid 1892] write(2, "sox: ", 5sox: ) = 5
[pid 1892] write(2, "bad output format", 17bad output format) = 17
[pid 1892] write(2, "\n", 1
) = 1
[pid 1892] close(3) = 0
[pid 1892] munmap(0x40016000, 4096) = 0
[pid 1892] close(4) = 0
`dd if=/dev/zero of=/dev/dsp1' writes about 256k before writes block.
`mpg123 -a /dev/dsp1 mymp3.mp3' is doing this:
open("/dev/dsp1", O_WRONLY) = 3
ioctl(3, SNDCTL_DSP_GETBLKSIZE, 0x806e5a0) = 0
ioctl(3, SNDCTL_DSP_RESET, 0) = 0
ioctl(3, SOUND_PCM_READ_BITS, 0xbffffab0) = -1 EINVAL (Invalid argument)
ioctl(3, SOUND_PCM_READ_BITS, 0xbffffab0) = 0
ioctl(3, SNDCTL_DSP_STEREO, 0xbffffaac) = 0
ioctl(3, SOUND_PCM_READ_RATE, 0xbffffaa8) = 0
ioctl(3, SOUND_PCM_READ_BITS, 0xbffffab0) = 0
ioctl(3, SNDCTL_DSP_STEREO, 0xbffffaac) = 0
ioctl(3, SOUND_PCM_READ_RATE, 0xbffffaa8) = 0
ioctl(3, SOUND_PCM_READ_BITS, 0xbffffab0) = 0
ioctl(3, SNDCTL_DSP_STEREO, 0xbffffaac) = 0
ioctl(3, SOUND_PCM_READ_RATE, 0xbffffaa8) = 0
ioctl(3, SOUND_PCM_READ_BITS, 0xbffffab0) = 0
<snip>
ioctl(3, SNDCTL_DSP_STEREO, 0xbffffaac) = 0
ioctl(3, SOUND_PCM_READ_RATE, 0xbffffaa8) = 0
ioctl(3, SOUND_PCM_READ_BITS, 0xbffffab0) = -1 EINVAL (Invalid argument)
close(3) = 0
As for the actual board inside the grey plastic case, it has two tiny
ICs on it - one is labelled "KC2178P", the other "XWM9707" + "16ADAU2"
So, what do you think? Start reading at
http://www.usb.org/developers/data/devclass/audio10.pdf, or is there
an easy solution to this? Perhaps some information on deciphering the
output of `lsusb'?
FWIW it works perfectly under Windows with no (advertised) special
support by the Windows USB audio driver.
--
Sam Vilain, [email protected] WWW: http://sam.vilain.net/
7D74 2A09 B2D3 C30F F78E GPG: http://sam.vilain.net/sam.asc
278A A425 30A9 05B5 2F13
Sam Vilain wrote:
> usbaudio: unit 8: invalid PROCESSING_UNIT descriptor
Aparently this is due to a superfluous test in the audiocontrol
parsing...
> [pid 1892] ioctl(4, SNDCTL_DSP_RESET, 0) = 0
> [pid 1892] ioctl(4, SNDCTL_DSP_SYNC, 0) = 0
> [pid 1892] ioctl(4, SNDCTL_DSP_GETFMTS, 0xbffffc04) = 0
> [pid 1892] ioctl(4, SOUND_PCM_READ_BITS, 0xbffffc04) = 0
> [pid 1892] ioctl(4, SNDCTL_DSP_STEREO, 0xbffffc04) = 0
> [pid 1892] ioctl(4, SOUND_PCM_READ_RATE, 0xbffffc04) = 0
> [pid 1892] write(2, "sox: ", 5sox: ) = 5
> [pid 1892] write(2, "Unable to set audio speed to 441"..., 45Unable to set audio speed to 44100 (set to 0)) = 45
Spooky. It doesn't even try to set the sampling rate but complains...
somehow cannot be...
> ioctl(3, SOUND_PCM_READ_BITS, 0xbffffab0) = -1 EINVAL (Invalid argument)
Again spooky, I don't see how audio.o ioctl handler could return EINVAL
at
that call. EFAULT yes, but EINVAL??
Tom
Thomas Sailer <[email protected]> wrote:
> > usbaudio: unit 8: invalid PROCESSING_UNIT descriptor
> Aparently this is due to a superfluous test in the audiocontrol
> parsing...
Would that be this test:
case PROCESSING_UNIT:
if ( p1[0] < 13
|| p1[0] < 13 + p1[6]
|| p1[0] < 13 + p1[6] + p1[ 11 + p1[6] ]
|| p1[0] < 13 + p1[6] + p1[ 11 + p1[6] ]
+ p1[ 13 + p1[6] + p1[ 11 + p1[6] ] ] )
{
printk(KERN_ERR "usbaudio: unit %u: invalid PROCESSING_UNIT"
"descriptor\n", unitid);
return;
}
usb_audio_processingunit(state, p1);
return;
This relates to this section of `lsusb':
AudioControl Interface Descriptor:
bLength 16
bDescriptorType 36
bDescriptorSubtype 7 (PROCESSING_UNIT)
bUnitID 8
wProcessType 3
bNrPins 1
baSourceID( 0) 7
bNrChannels 2
wChannelConfig 0x0003
Left Front (L)
Right Front (R)
iChannelNames 0
bControlSize 2
bmControls( 0) 0x03
bmControls( 1) 0x00
Enable Processing
iProcessing 0
Process-Specific
I removed the last one of those || tests, because it was the only
figure that amounted to greater than p1[0] - it was 25, p1[0] was 16.
here's the messages out now (I changed a few #ifdef 0's to 1, so
there's a bit more debugging output, and added one on
usb_audio_recurseunit so I could see it being run):
usb.c: registered new driver audio
usbaudio: device 5 audiocontrol interface 0 has 1 input and 1 output AudioStream
ing interfaces
usbaudio: valid input sample rate 48000
usbaudio: valid input sample rate 32000
usbaudio: valid input sample rate 44100
usbaudio: device 5 interface 2 altsetting 1: format 0x00000010 sratelo 32000 sra
tehi 48000 attributes 0x01
usbaudio: valid input sample rate 48000
usbaudio: valid input sample rate 32000
usbaudio: valid input sample rate 44100
usbaudio: device 5 interface 2 altsetting 2: format 0x80000010 sratelo 32000 sra
tehi 48000 attributes 0x01
usbaudio: device 5 interface 1 altsetting 0 does not have an endpoint
usbaudio: valid output sample rate 48000
usbaudio: valid output sample rate 32000
usbaudio: valid output sample rate 44100
usbaudio: device 5 interface 1 altsetting 1: format 0x00000010 sratelo 32000 sra
tehi 48000 attributes 0x01
usbaudio: valid output sample rate 48000
usbaudio: valid output sample rate 32000
usbaudio: valid output sample rate 44100
usbaudio: device 5 interface 1 altsetting 2: format 0x80000010 sratelo 32000 sra
tehi 48000 attributes 0x01
usbaudio: registered dsp 14,19
usbaudio: constructing mixer for Terminal 10 type 0x0301
usbaudio: usb_audio_recurseunit(struct consmixstate *state,9)
usbaudio: usb_audio_recurseunit(struct consmixstate *state,8)
usbaudio: usb_audio_recurseunit(struct consmixstate *state,7)
usbaudio: usb_audio_recurseunit(struct consmixstate *state,4)
usbaudio: usb_audio_recurseunit(struct consmixstate *state,1)
usbaudio: usb_audio_recurseunit(struct consmixstate *state,5)
usbaudio: usb_audio_recurseunit(struct consmixstate *state,2)
usbaudio: usb_audio_recurseunit(struct consmixstate *state,6)
usbaudio: usb_audio_recurseunit(struct consmixstate *state,3)
usbaudio: warning: found 1 of 0 logical channels.
usbaudio: assuming the channel found is the master channel (got a Philips camera
?). Should be fine.
usbaudio: unit 7 invalid MIXER_UNIT descriptor (bitmap too small)
usbaudio: registered mixer 14,16
usbaudio: constructing mixer for Terminal 13 type 0x0101
usbaudio: usb_audio_recurseunit(struct consmixstate *state,12)
usbaudio: usb_audio_recurseunit(struct consmixstate *state,11)
usbaudio: usb_audio_recurseunit(struct consmixstate *state,2)
usbaudio: selector unit 11: ignoring channel 1
usbaudio: usb_audio_recurseunit(struct consmixstate *state,3)
usbaudio: selector unit 11: input pins with varying channel numbers
usbaudio: feature unit 12 source has no channels
usbaudio: no mixer controls found for Terminal 13
usb_audio_parsecontrol: usb_audio_state at ce0b1760
audio.c: v1.0.0:USB Audio Class driver
Sox says something different now:
hoffman:~/sounds/tech_samps/reference$ strace -fo /tmp/trace play -d /dev/dsp1 trumpets1.wav
Process 4885 attached
Process 4884 suspended
Process 4884 resumed
Process 4885 detached
Process 4886 attached
Process 4886 detached
Process 4887 attached
Process 4884 suspended
sox: Unable to set audio speed to 44100 (set to 524288)
Process 4884 resumed
Process 4887 detached
Here's the trace:
4887 open("/dev/dsp1", O_WRONLY|O_CREAT|O_TRUNC, 0666) = 4
4887 fstat64(4, {st_mode=S_IFCHR|0660, st_rdev=makedev(14, 19), ...}) = 0
4887 ioctl(4, SNDCTL_TMR_TIMEBASE, 0xbffff9b8) = -1 ENOIOCTLCMD (errno 515)
4887 old_mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1,
0) = 0x40017000
4887 fstat64(4, {st_mode=S_IFCHR|0660, st_rdev=makedev(14, 19), ...}) = 0
4887 ioctl(4, SNDCTL_DSP_RESET, 0) = 0
4887 ioctl(4, SNDCTL_DSP_SYNC, 0) = 0
4887 ioctl(4, SNDCTL_DSP_GETFMTS, 0xbffffb14) = 0
4887 ioctl(4, SOUND_PCM_READ_BITS, 0xbffffb14) = 0
4887 ioctl(4, SNDCTL_DSP_STEREO, 0xbffffb14) = 0
4887 ioctl(4, SOUND_PCM_READ_RATE, 0xbffffb14) = 0
4887 write(2, "sox: ", 5) = 5
4887 write(2, "Unable to set audio speed to 441"..., 50) = 50
4887 write(2, "\n", 1) = 1
4887 ioctl(4, SNDCTL_DSP_GETBLKSIZE, 0x80a52f0) = 0
4887 brk(0x80ae000) = 0x80ae000
4887 munmap(0x40017000, 4096) = 0
4887 brk(0x80b4000) = 0x80b4000
4887 brk(0x80ba000) = 0x80ba000
4887 brk(0x80cb000) = 0x80cb000
4887 brk(0x80d1000) = 0x80d1000
4887 brk(0x80e2000) = 0x80e2000
4887 brk(0x80eb000) = 0x80eb000
4887 brk(0x80f4000) = 0x80f4000
4887 read(3, "\31\0\345\377\31\0\326\377\16\0\313\377#\0\306\377\23\0"..., 8192
) = 8192
4887 read(3, "\311\371m\375\323\371\326\374\375\371Z\374-\376e\374\r"..., 8192)
= 8192
4887 write(4, "\31\0\345\377\32\0\344\377\33\0\342\377\34\0\340\377\35"..., 163
84) = 16384
4887 write(4, "\377\377\270\377\377\377\270\377\0\0\270\377\0\0\271\377"..., 16
[...]
4887 write(4, "\374\377\220\377\374\377\217\377\375\377\215\377\375\377"..., 16
384) = 16384
4887 close(3) = 0
4887 munmap(0x40016000, 4096) = 0
4887 write(4, "\25\0\326\377\25\0\326\377\25\0\326\377\25\0\326\377\25"..., 111
2) = 1112
4887 close(4) = 0
4887 _exit(0) = ?
Something is now coming out of the output, but it sounds like it's
being played with the wrong encoding or something like that. It's
really broken, but the total level of the sound output is somewhat not
entirely unlike the sound I'm playing. It also takes longer to play
than it should - something less than twice as long as the audio file,
so I doubt it's really being played with a sampling frequency of
524288 :). My MD player seems to be happily locked onto its output,
so the device is really running at a sane sampling frequency.
The error about the MIXER_UNIT is probably expected - I don't think
that this device actually _has_ a mixer. I suspect it's just a dumb
straight-through digital audio interface.
> > [pid 1892] ioctl(4, SNDCTL_DSP_RESET, 0) = 0
> > [pid 1892] ioctl(4, SNDCTL_DSP_SYNC, 0) = 0
> > [pid 1892] ioctl(4, SNDCTL_DSP_GETFMTS, 0xbffffc04) = 0
> > [pid 1892] ioctl(4, SOUND_PCM_READ_BITS, 0xbffffc04) = 0
> > [pid 1892] ioctl(4, SNDCTL_DSP_STEREO, 0xbffffc04) = 0
> > [pid 1892] ioctl(4, SOUND_PCM_READ_RATE, 0xbffffc04) = 0
> > [pid 1892] write(2, "sox: ", 5sox: ) = 5
> > [pid 1892] write(2, "Unable to set audio speed to 441"..., 45Unable
> > to set audio speed to 44100 (set to 0)) = 45
>
> Spooky. It doesn't even try to set the sampling rate but complains...
> somehow cannot be...
I think it was probably complaining about this error:
[pid 1892] ioctl(4, SNDCTL_TMR_TIMEBASE, 0xbffffaa8) = -1 ENOIOCTLCMD
(errno 515)
it looks to me like it's trying to set the time base of sampler/sampling
period. It gets an error, so it then falls back to reading what the
sampler is currently running at to see if it just happens to be what we
want. It reads a period of "0". Hmm, a wave with a period of 0 ...
that's the sound of one hand clapping isn't it?
> > ioctl(3, SOUND_PCM_READ_BITS, 0xbffffab0) = -1 EINVAL (Invalid
> > argument)
> Again spooky, I don't see how audio.o ioctl handler could return EINVAL
> at that call. EFAULT yes, but EINVAL??
How would I go about debugging that?
--
Sam Vilain, [email protected] WWW: http://sam.vilain.net/
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"God is a comedian playing to an audience too afraid to laugh."
- Voltaire -