Supporting USB audio Pro interfaces #336

nickverlinden · 2022-12-24T14:13:57Z

nickverlinden
Dec 24, 2022

I tested Circle 45 with the RME BabyFace Pro in Class Compliant mode, but ran into some trouble.
First, I had to change this, because else i got an assertion:

usbaudiofunctopology.h:line 44

	static const unsigned MaximumChannelIndex = 32;		// 0: reserved for master channel

Then, when running sample 34-sounddevices, i get this:

logger: Circle 45 started on Raspberry Pi 4 Model B
00:00:00.66 timer: SpeedFactor is 1.51
00:00:00.73 pcie: Link up, 5.0 Gbps x1
00:00:01.14 usbdev1: Device ven2109-3431, dev9-0-1 found (HS)
00:00:01.14 usbdev1: Product: USB2.0 Hub
00:00:01.19 usbdev1: Interface int9-0-0 found
00:00:01.19 usbdev1: Using device/interface int9-0-0
00:00:01.87 usbdev1-1: Device ven2a39-3fb0, devef-2-1 found (HS)
00:00:01.88 usbdev1-1: Product: RME Babyface Pro (71971087)
00:00:01.93 usbdev1-1: Interface int1-1-20 found
00:00:01.93 usbdev1-1: Using device/interface int1-1-20
00:00:01.94 usbdev1-1: Interface int1-2-20 found
00:00:01.94 usbdev1-1: Using device/interface int1-2-20
00:00:01.95 usbdev1-1: Cannot initialize function
00:00:01.95 usbdev1-1: Interface int1-2-20 found
00:00:01.96 usbdev1-1: Using device/interface int1-2-20
00:00:01.96 usbdev1-1: Alternate setting 2 ignored
00:00:01.96 usbdev1-1: Interface int1-2-20 found
00:00:01.97 usbdev1-1: Using device/interface int1-2-20
00:00:01.97 usbdev1-1: Cannot initialize function
00:00:01.98 usbdev1-1: Interface int1-2-20 found
00:00:01.98 usbdev1-1: Using device/interface int1-2-20
00:00:01.99 usbdev1-1: Alternate setting 2 ignored
00:00:01.99 usbdev1-1: Interface int1-3-0 found
00:00:02.00 usbdev1-1: Using device/interface int1-3-0
00:00:02.16 usbdev1-3: Device ven712-9 found (FS)
00:00:02.17 usbdev1-3: Product: WaveShare WaveShare
00:00:02.22 usbdev1-3: Interface int3-0-2 found
00:00:02.23 usbdev1-3: Using device/interface int3-0-2
00:00:02.38 usbdev1-4: Device ven18a5-245 found (HS)
00:00:02.39 usbdev1-4: Product: Verbatim STORE N GO
00:00:02.44 usbdev1-4: Interface int8-6-50 found
00:00:02.45 usbdev1-4: Using device/interface int8-6-50
00:00:02.45 uaudio: Unsupported audio format (chans 2)
00:00:02.46 uaudio: Dumping 0x6 bytes starting at 0x82CE07
00:00:02.46 uaudio: CE07: 06 24 02 01 03 18 07 05-03 05 96 00 01 08 25 01
00:00:02.47 uaudio: Unsupported audio format (chans 12)
00:00:02.47 uaudio: Dumping 0x6 bytes starting at 0x82CE7A
00:00:02.48 uaudio: CE7A: 06 24 02 01 03 18 07 05-84 05 84 03 01 08 25 01
00:00:02.48 usbhub: Port 1: Device configured
00:00:02.49 usbhub: Port 3: Device configured
00:00:02.70 umsd: Capacity is 14800 MByte
00:00:02.70 usbhub: Port 4: Device configured
00:00:02.71 xhciroot: Port 1: Device configured
00:00:02.71 kernel: Compile time: Dec 24 2022 15:01:06
00:00:02.72 sndusb: Probing sound controller failed
00:00:02.72 kernel: Cannot start sound device

Looking at the warnings and the code inside usbaudiostreaming.cpp, I imagine the Babyface Pro does not support 16bit audio. What do you think?

nickverlinden · 2022-12-24T14:23:09Z

nickverlinden
Dec 24, 2022
Author

I also did a test with a Presonus StudioLive 24R, which is a 64 channel interface. Had to increase MaximumChannelIndex some more :-)

But after that results in the same problem:

logger: Circle 45 started on Raspberry Pi 4 Model B
00:00:00.66 timer: SpeedFactor is 1.51
00:00:00.73 pcie: Link up, 5.0 Gbps x1
00:00:01.14 usbdev1: Device ven2109-3431, dev9-0-1 found (HS)
00:00:01.14 usbdev1: Product: USB2.0 Hub
00:00:01.20 usbdev1: Interface int9-0-0 found
00:00:01.20 usbdev1: Using device/interface int9-0-0
00:00:01.87 usbdev1-1: Device ven194f-804, devef-2-1 found (HS)
00:00:01.88 usbdev1-1: Product: PreSonus StudioLive 24R
00:00:01.93 usbdev1-1: Interface int1-1-20 found
00:00:01.93 usbdev1-1: Using device/interface int1-1-20
00:00:01.94 usbdev1-1: Interface int1-2-20 found
00:00:01.94 usbdev1-1: Using device/interface int1-2-20
00:00:01.95 usbdev1-1: Cannot initialize function
00:00:01.95 usbdev1-1: Interface int1-2-20 found
00:00:01.95 usbdev1-1: Using device/interface int1-2-20
00:00:01.96 usbdev1-1: Interface int1-2-20 found
00:00:01.96 usbdev1-1: Using device/interface int1-2-20
00:00:01.97 usbdev1-1: Cannot initialize function
00:00:01.97 usbdev1-1: Interface int1-2-20 found
00:00:01.98 usbdev1-1: Using device/interface int1-2-20
00:00:01.98 usbdev1-1: Function is not supported
00:00:02.14 usbdev1-3: Device ven712-9 found (FS)
00:00:02.15 usbdev1-3: Product: WaveShare WaveShare
00:00:02.20 usbdev1-3: Interface int3-0-2 found
00:00:02.21 usbdev1-3: Using device/interface int3-0-2
00:00:02.36 usbdev1-4: Device ven18a5-245 found (HS)
00:00:02.38 usbdev1-4: Product: Verbatim STORE N GO
00:00:02.43 usbdev1-4: Interface int8-6-50 found
00:00:02.43 usbdev1-4: Using device/interface int8-6-50
00:00:02.43 uaudiotopo: Unsupported entity (11)
00:00:02.44 uaudio: Unsupported audio format (chans 64)
00:00:02.44 uaudio: Dumping 0x6 bytes starting at 0x82CE16
00:00:02.45 uaudio: CE16: 06 24 02 01 04 18 07 05-01 05 00 0C 01 08 25 01
00:00:02.45 uaudio: Unsupported audio format (chans 64)
00:00:02.46 uaudio: Dumping 0x6 bytes starting at 0x82CE54
00:00:02.47 uaudio: CE54: 06 24 02 01 04 18 07 05-82 05 00 0C 01 08 25 01
00:00:02.47 usbhub: Port 1: Device configured
00:00:02.48 usbhub: Port 3: Device configured
00:00:02.68 umsd: Capacity is 14800 MByte
00:00:02.69 usbhub: Port 4: Device configured
00:00:02.69 xhciroot: Port 1: Device configured
00:00:02.69 kernel: Compile time: Dec 24 2022 15:19:18
00:00:02.70 sndusb: Probing sound controller failed
00:00:02.70 kernel: Cannot start sound device

0 replies

rsta2 · 2022-12-25T10:26:43Z

rsta2
Dec 25, 2022
Maintainer

Circle supports only USB audio interfaces with 2 channels and 16-bit sample size. Your interfaces are much above this. I will see, if I can scale this up now. This will take some time. We have to test, if the USB isochronous bandwidth, which is provided by the Circle xHCI driver, is sufficient for so many channels.

0 replies

nickverlinden · 2022-12-25T12:23:36Z

nickverlinden
Dec 25, 2022
Author

Hi Rene, I figured as much. The babyface pro does seem to have a 2 channel interface as well, but probably 24 bit only. I imagine many of the pro audio interfaces have 24bit support only. I can perform tests! Kind regards,Nick

4 replies

rsta2 Dec 25, 2022
Maintainer

Hi Nick, then I will start with supporting 24-bit sample size additionally to 16-bit with 2 channels. The RME BabyFace Pro should work with this and maybe more audio pro interfaces. Thanks for the offer to test! I will come back on it. Rene

nickverlinden Dec 25, 2022
Author

Super, thanks for the great and hard work you're putting into Circle! Looking forward to testing this. Is there any kind of performance penalty (cpu, latency, ...) when using usb audio interfaces compared to i2s audio interfaces, or is this mostly negligible?

rsta2 Dec 26, 2022
Maintainer

I think, I2S puts less load onto the CPU, because the platform DMA controller does the data transferring work on its own in background all the time. With USB each transfer must be programmed in the xHCI controller. I don't think, there is much difference in latency, but this also depends on the used USB audio interface. Thanks for appreciating Circle!

nickverlinden Dec 26, 2022
Author

That's what I thought, good to know, thx.

rsta2 · 2022-12-26T13:04:05Z

rsta2
Dec 26, 2022
Maintainer

The updated source code is on the branch usbaudio-24bits. If an USB audio interface with 24 bits sample size is going to be used, the option soundopt=24 must be added to the first line of the file cmdline.txt on the SD card. If this option is left out or is set to 16, a sample size of 16 bits is expected. This cannot be auto-detected, because the interface descriptors can only be parsed once in Circle and the different sample sizes can be occur in any order. You should also define the system option REALTIME (e.g. by adding the line DEFINE += -DREALTIME to Config.mk), because it's time critical. I got clicks on the audio with 24 bits without it. Please let me know, if it works!

1 reply

nickverlinden Dec 26, 2022
Author

Amazing, you work very fast! I'll probably try this tomorrow evening since i'm home late today. I also have a Zoom R8, which is supposed to be a class compliant 2 channel audio interface, so i'll do a test with that too.

nickverlinden · 2022-12-27T08:10:06Z

nickverlinden
Dec 27, 2022
Author

did some testing this morning. The Babyface Pro stops at an assertion, and the zoom r8 also doesn't work but doesn't kill the kernel.
I'm using sample 42-soundinput to test.

Here is the output:

RME Babyface Pro
logger: Circle 45 started on Raspberry Pi 4 Model B
00:00:00.66 timer: SpeedFactor is 1.51
00:00:00.73 pcie: Link up, 5.0 Gbps x1
00:00:01.14 usbdev1: Device ven2109-3431, dev9-0-1 found (HS)
00:00:01.14 usbdev1: Product: USB2.0 Hub
00:00:01.20 usbdev1: Interface int9-0-0 found
00:00:01.20 usbdev1: Using device/interface int9-0-0
00:00:01.87 usbdev1-1: Device ven18a5-245 found (HS)
00:00:01.88 usbdev1-1: Product: Verbatim STORE N GO
00:00:01.94 usbdev1-1: Interface int8-6-50 found
00:00:01.94 usbdev1-1: Using device/interface int8-6-50
00:00:02.10 usbdev1-3: Device ven712-9 found (FS)
00:00:02.11 usbdev1-3: Product: WaveShare WaveShare
00:00:02.16 usbdev1-3: Interface int3-0-2 found
00:00:02.17 usbdev1-3: Using device/interface int3-0-2
00:00:02.32 usbdev1-4: Device ven2a39-3fb0, devef-2-1 found (HS)
00:00:02.32 usbdev1-4: Product: RME Babyface Pro (71971087)
00:00:02.38 usbdev1-4: Interface int1-1-20 found
00:00:02.38 usbdev1-4: Using device/interface int1-1-20
00:00:02.39 usbdev1-4: Interface int1-2-20 found
00:00:02.39 usbdev1-4: Using device/interface int1-2-20
00:00:02.40 usbdev1-4: Cannot initialize function
00:00:02.40 usbdev1-4: Interface int1-2-20 found
00:00:02.40 usbdev1-4: Using device/interface int1-2-20
00:00:02.41 usbdev1-4: Alternate setting 2 ignored
00:00:02.41 usbdev1-4: Interface int1-2-20 found
00:00:02.42 usbdev1-4: Using device/interface int1-2-20
00:00:02.42 usbdev1-4: Cannot initialize function
00:00:02.43 usbdev1-4: Interface int1-2-20 found
00:00:02.43 usbdev1-4: Using device/interface int1-2-20
00:00:02.44 uaudio: Ignore interface (12 chans, 24 bits, 3 bytes)
00:00:02.44 usbdev1-4: Cannot initialize function
00:00:02.45 usbdev1-4: Interface int1-2-20 found
00:00:02.45 usbdev1-4: Using device/interface int1-2-20
00:00:02.46 usbdev1-4: Interface int1-3-0 found
00:00:02.46 usbdev1-4: Using device/interface int1-3-0
00:00:02.67 umsd: Capacity is 14800 MByte
00:00:02.67 usbhub: Port 1: Device configured
00:00:02.68 usbhub: Port 3: Device configured
00:00:02.68 usbaudiofunctopology.cpp(507): stack[7] is 0x236A4
00:00:02.68 usbaudiofunctopology.cpp(507): stack[13] is 0x23660
00:00:02.69 usbaudiofunctopology.cpp(507): stack[19] is 0x23748
00:00:02.70 usbaudiofunctopology.cpp(507): stack[27] is 0x226A4
00:00:02.70 usbaudiofunctopology.cpp(507): stack[31] is 0x13E30
00:00:02.71 usbaudiofunctopology.cpp(507): stack[41] is 0x318A8
00:00:02.71 usbaudiofunctopology.cpp(507): stack[57] is 0x30AB8
00:00:02.72 usbaudiofunctopology.cpp(507): stack[59] is 0x348AC
00:00:02.72 usbaudiofunctopology.cpp(507): assertion failed: pCurrentEntity






ZOOM R8 in Class Compliant 2.0 mode
logger: Circle 45 started on Raspberry Pi 4 Model B
00:00:00.66 timer: SpeedFactor is 1.51
00:00:00.73 pcie: Link up, 5.0 Gbps x1
00:00:01.14 usbdev1: Device ven2109-3431, dev9-0-1 found (HS)
00:00:01.14 usbdev1: Product: USB2.0 Hub
00:00:01.20 usbdev1: Interface int9-0-0 found
00:00:01.20 usbdev1: Using device/interface int9-0-0
00:00:01.88 usbdev1-1: Device ven18a5-245 found (HS)
00:00:01.89 usbdev1-1: Product: Verbatim STORE N GO
00:00:01.94 usbdev1-1: Interface int8-6-50 found
00:00:01.94 usbdev1-1: Using device/interface int8-6-50
00:00:02.10 usbdev1-3: Device ven712-9 found (FS)
00:00:02.11 usbdev1-3: Product: WaveShare WaveShare
00:00:02.17 usbdev1-3: Interface int3-0-2 found
00:00:02.17 usbdev1-3: Using device/interface int3-0-2
00:00:02.33 usbdev1-4: Device ven1686-14f, devef-2-1 found (HS)
00:00:02.33 usbdev1-4: Product: ZOOM Corporation ZOOM R8
00:00:02.39 usbdev1-4: Interface int1-1-20 found
00:00:02.39 usbdev1-4: Using device/interface int1-1-20
00:00:02.39 usbdev1-4: Interface int1-2-20 found
00:00:02.40 usbdev1-4: Using device/interface int1-2-20
00:00:02.40 usbdev1-4: Cannot initialize function
00:00:02.41 usbdev1-4: Interface int1-2-20 found
00:00:02.41 usbdev1-4: Using device/interface int1-2-20
00:00:02.42 usbdev1-4: Interface int1-2-20 found
00:00:02.42 usbdev1-4: Using device/interface int1-2-20
00:00:02.43 usbdev1-4: Cannot initialize function
00:00:02.43 usbdev1-4: Interface int1-2-20 found
00:00:02.43 usbdev1-4: Using device/interface int1-2-20
00:00:02.44 usbdev1-4: Interface int1-1-0 found
00:00:02.44 usbdev1-4: Using device/interface int1-1-0
00:00:02.45 usbdev1-4: Interface int1-3-0 found
00:00:02.45 usbdev1-4: Using device/interface int1-3-0
00:00:02.66 umsd: Capacity is 14800 MByte
00:00:02.66 usbhub: Port 1: Device configured
00:00:02.67 usbhub: Port 3: Device configured
00:00:02.67 uaudiotopo: Unsupported entity (11)
00:00:02.68 xhciep: Transfer error 6 on endpoint 1
00:00:02.68 uaudio: Cannot get number of sampling frequency subranges
00:00:03.69 xhciep: Transfer timed out
00:00:03.69 usbfct: Cannot set interface
00:00:03.69 uaudio: Cannot set interface
00:00:03.69 usbhub: Port 4: Device configured
00:00:03.70 xhciroot: Port 1: Device configured
00:00:03.70 kernel: Compile time: Dec 27 2022 08:38:56
00:00:03.71 sndusb: Probing sound controller failed
00:00:03.71 kernel: Cannot start input sound device







ZOOM R8 in Class Compliant 1.0 mode
logger: Circle 45 started on Raspberry Pi 4 Model B
00:00:00.66 timer: SpeedFactor is 1.51
00:00:00.73 pcie: Link up, 5.0 Gbps x1
00:00:01.14 usbdev1: Device ven2109-3431, dev9-0-1 found (HS)
00:00:01.14 usbdev1: Product: USB2.0 Hub
00:00:01.20 usbdev1: Interface int9-0-0 found
00:00:01.20 usbdev1: Using device/interface int9-0-0
00:00:01.88 usbdev1-1: Device ven18a5-245 found (HS)
00:00:01.89 usbdev1-1: Product: Verbatim STORE N GO
00:00:01.94 usbdev1-1: Interface int8-6-50 found
00:00:01.95 usbdev1-1: Using device/interface int8-6-50
00:00:02.11 usbdev1-3: Device ven712-9 found (FS)
00:00:02.12 usbdev1-3: Product: WaveShare WaveShare
00:00:02.17 usbdev1-3: Interface int3-0-2 found
00:00:02.18 usbdev1-3: Using device/interface int3-0-2
00:00:02.33 usbdev1-4: Device ven1686-14f found (HS)
00:00:02.33 usbdev1-4: Product: ZOOM Corporation ZOOM R8
00:00:02.39 usbdev1-4: Interface int1-1-0 found
00:00:02.39 usbdev1-4: Using device/interface int1-1-0
00:00:02.40 usbdev1-4: Interface int1-2-0 found
00:00:02.40 usbdev1-4: Using device/interface int1-2-0
00:00:02.40 usbdev1-4: Cannot initialize function
00:00:02.41 usbdev1-4: Interface int1-2-0 found
00:00:02.41 usbdev1-4: Using device/interface int1-2-0
00:00:02.42 usbdev1-4: Interface int1-2-0 found
00:00:02.42 usbdev1-4: Using device/interface int1-2-0
00:00:02.43 usbdev1-4: Cannot initialize function
00:00:02.43 usbdev1-4: Interface int1-2-0 found
00:00:02.44 usbdev1-4: Using device/interface int1-2-0
00:00:02.44 usbdev1-4: Interface int1-1-0 found
00:00:02.44 usbdev1-4: Using device/interface int1-1-0
00:00:02.45 usbdev1-4: Interface int1-3-0 found
00:00:02.45 usbdev1-4: Using device/interface int1-3-0
00:00:02.66 umsd: Capacity is 14800 MByte
00:00:02.66 usbhub: Port 1: Device configured
00:00:02.67 usbhub: Port 3: Device configured
00:00:02.67 uaudio: Unsupported EP timing (4)
00:00:02.68 uaudio: Unsupported EP timing (4)
00:00:02.68 usbhub: Port 4: Device configured
00:00:02.69 xhciroot: Port 1: Device configured
00:00:02.69 kernel: Compile time: Dec 27 2022 08:38:56
00:00:02.70 sndusb: Probing sound controller failed
00:00:02.70 kernel: Cannot start input sound device

6 replies

nickverlinden Dec 27, 2022
Author

Check! It's a big one...

Bus 001 Device 005: ID 2a39:3fb0 RME Babyface Pro (Class Compliant Mode)
Couldn't open device, some information will be missing
Device Descriptor:
  bLength                18
  bDescriptorType         1
  bcdUSB               2.00
  bDeviceClass          239 Miscellaneous Device
  bDeviceSubClass         2 
  bDeviceProtocol         1 Interface Association
  bMaxPacketSize0        64
  idVendor           0x2a39 RME
  idProduct          0x3fb0 Babyface Pro (Class Compliant Mode)
  bcdDevice            0.01
  iManufacturer           1 RME
  iProduct                2 Babyface Pro (71971087)
  iSerial                 3 0A8EA06366B6CC8
  bNumConfigurations      1
  Configuration Descriptor:
    bLength                 9
    bDescriptorType         2
    wTotalLength       0x01a7
    bNumInterfaces          4
    bConfigurationValue     1
    iConfiguration          0 
    bmAttributes         0x80
      (Bus Powered)
    MaxPower              100mA
    Interface Association:
      bLength                 8
      bDescriptorType        11
      bFirstInterface         0
      bInterfaceCount         4
      bFunctionClass          1 Audio
      bFunctionSubClass       0 
      bFunctionProtocol      32 
      iFunction               0 
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       0
      bNumEndpoints           0
      bInterfaceClass         1 Audio
      bInterfaceSubClass      1 Control Device
      bInterfaceProtocol     32 
      iInterface              0 
      AudioControl Interface Descriptor:
        bLength                 9
        bDescriptorType        36
        bDescriptorSubtype      1 (HEADER)
        bcdADC               2.00
        bCategory               8
        wTotalLength       0x0055
        bmControls           0x00
      AudioControl Interface Descriptor:
        bLength                 8
        bDescriptorType        36
        bDescriptorSubtype     10 (CLOCK_SOURCE)
        bClockID                1
        bmAttributes            3 Internal programmable clock 
        bmControls           0x03
          Clock Frequency Control (read/write)
        bAssocTerminal          0
        iClockSource            0 
      AudioControl Interface Descriptor:
        bLength                17
        bDescriptorType        36
        bDescriptorSubtype      2 (INPUT_TERMINAL)
        bTerminalID             3
        wTerminalType      0x0101 USB Streaming
        bAssocTerminal          0
        bCSourceID              1
        bNrChannels            12
        bmChannelConfig    0x00000000
        iChannelNames           0 
        bmControls         0x0000
        iTerminal               0 
      AudioControl Interface Descriptor:
        bLength                17
        bDescriptorType        36
        bDescriptorSubtype      2 (INPUT_TERMINAL)
        bTerminalID             5
        wTerminalType      0x0201 Microphone
        bAssocTerminal          0
        bCSourceID              1
        bNrChannels            12
        bmChannelConfig    0x00000000
        iChannelNames           0 
        bmControls         0x0000
        iTerminal               0 
      AudioControl Interface Descriptor:
        bLength                12
        bDescriptorType        36
        bDescriptorSubtype      3 (OUTPUT_TERMINAL)
        bTerminalID             4
        wTerminalType      0x0301 Speaker
        bAssocTerminal          0
        bSourceID               2
        bCSourceID              1
        bmControls         0x0000
        iTerminal               0 
      AudioControl Interface Descriptor:
        bLength                12
        bDescriptorType        36
        bDescriptorSubtype      3 (OUTPUT_TERMINAL)
        bTerminalID             6
        wTerminalType      0x0101 USB Streaming
        bAssocTerminal          0
        bSourceID               5
        bCSourceID              1
        bmControls         0x0000
        iTerminal               0 
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        1
      bAlternateSetting       0
      bNumEndpoints           0
      bInterfaceClass         1 Audio
      bInterfaceSubClass      2 Streaming
      bInterfaceProtocol     32 
      iInterface              0 
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        1
      bAlternateSetting       1
      bNumEndpoints           2
      bInterfaceClass         1 Audio
      bInterfaceSubClass      2 Streaming
      bInterfaceProtocol     32 
      iInterface              0 
      AudioStreaming Interface Descriptor:
        bLength                16
        bDescriptorType        36
        bDescriptorSubtype      1 (AS_GENERAL)
        bTerminalLink           3
        bmControls           0x00
        bFormatType             1
        bmFormats          0x00000001
          PCM
        bNrChannels             2
        bmChannelConfig    0x00000003
          Front Left (FL)
          Front Right (FR)
        iChannelNames           0 
      AudioStreaming Interface Descriptor:
        bLength                 6
        bDescriptorType        36
        bDescriptorSubtype      2 (FORMAT_TYPE)
        bFormatType             1 (FORMAT_TYPE_I)
        bSubslotSize            3
        bBitResolution         24
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x03  EP 3 OUT
        bmAttributes            5
          Transfer Type            Isochronous
          Synch Type               Asynchronous
          Usage Type               Data
        wMaxPacketSize     0x0096  1x 150 bytes
        bInterval               1
        AudioStreaming Endpoint Descriptor:
          bLength                 8
          bDescriptorType        37
          bDescriptorSubtype      1 (EP_GENERAL)
          bmAttributes         0x00
          bmControls           0x00
          bLockDelayUnits         0 Undefined
          wLockDelay         0x0000
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x83  EP 3 IN
        bmAttributes           17
          Transfer Type            Isochronous
          Synch Type               None
          Usage Type               Feedback
        wMaxPacketSize     0x0004  1x 4 bytes
        bInterval               4
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        1
      bAlternateSetting       2
      bNumEndpoints           2
      bInterfaceClass         1 Audio
      bInterfaceSubClass      2 Streaming
      bInterfaceProtocol     32 
      iInterface              0 
      AudioStreaming Interface Descriptor:
        bLength                16
        bDescriptorType        36
        bDescriptorSubtype      1 (AS_GENERAL)
        bTerminalLink           3
        bmControls           0x00
        bFormatType             1
        bmFormats          0x00000001
          PCM
        bNrChannels            12
        bmChannelConfig    0x00000000
        iChannelNames           0 
      AudioStreaming Interface Descriptor:
        bLength                 6
        bDescriptorType        36
        bDescriptorSubtype      2 (FORMAT_TYPE)
        bFormatType             1 (FORMAT_TYPE_I)
        bSubslotSize            3
        bBitResolution         24
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x03  EP 3 OUT
        bmAttributes            5
          Transfer Type            Isochronous
          Synch Type               Asynchronous
          Usage Type               Data
        wMaxPacketSize     0x0384  1x 900 bytes
        bInterval               1
        AudioStreaming Endpoint Descriptor:
          bLength                 8
          bDescriptorType        37
          bDescriptorSubtype      1 (EP_GENERAL)
          bmAttributes         0x00
          bmControls           0x00
          bLockDelayUnits         0 Undefined
          wLockDelay         0x0000
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x83  EP 3 IN
        bmAttributes           17
          Transfer Type            Isochronous
          Synch Type               None
          Usage Type               Feedback
        wMaxPacketSize     0x0004  1x 4 bytes
        bInterval               4
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        2
      bAlternateSetting       0
      bNumEndpoints           0
      bInterfaceClass         1 Audio
      bInterfaceSubClass      2 Streaming
      bInterfaceProtocol     32 
      iInterface              0 
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        2
      bAlternateSetting       1
      bNumEndpoints           1
      bInterfaceClass         1 Audio
      bInterfaceSubClass      2 Streaming
      bInterfaceProtocol     32 
      iInterface              0 
      AudioStreaming Interface Descriptor:
        bLength                16
        bDescriptorType        36
        bDescriptorSubtype      1 (AS_GENERAL)
        bTerminalLink           6
        bmControls           0x00
        bFormatType             1
        bmFormats          0x00000001
          PCM
        bNrChannels            12
        bmChannelConfig    0x00000000
        iChannelNames           0 
      AudioStreaming Interface Descriptor:
        bLength                 6
        bDescriptorType        36
        bDescriptorSubtype      2 (FORMAT_TYPE)
        bFormatType             1 (FORMAT_TYPE_I)
        bSubslotSize            3
        bBitResolution         24
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x84  EP 4 IN
        bmAttributes            5
          Transfer Type            Isochronous
          Synch Type               Asynchronous
          Usage Type               Data
        wMaxPacketSize     0x0384  1x 900 bytes
        bInterval               1
        AudioStreaming Endpoint Descriptor:
          bLength                 8
          bDescriptorType        37
          bDescriptorSubtype      1 (EP_GENERAL)
          bmAttributes         0x00
          bmControls           0x00
          bLockDelayUnits         0 Undefined
          wLockDelay         0x0000
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        2
      bAlternateSetting       2
      bNumEndpoints           1
      bInterfaceClass         1 Audio
      bInterfaceSubClass      2 Streaming
      bInterfaceProtocol     32 
      iInterface              0 
      AudioStreaming Interface Descriptor:
        bLength                16
        bDescriptorType        36
        bDescriptorSubtype      1 (AS_GENERAL)
        bTerminalLink           6
        bmControls           0x00
        bFormatType             1
        bmFormats          0x00000001
          PCM
        bNrChannels             2
        bmChannelConfig    0x00000003
          Front Left (FL)
          Front Right (FR)
        iChannelNames           0 
      AudioStreaming Interface Descriptor:
        bLength                 6
        bDescriptorType        36
        bDescriptorSubtype      2 (FORMAT_TYPE)
        bFormatType             1 (FORMAT_TYPE_I)
        bSubslotSize            3
        bBitResolution         24
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x84  EP 4 IN
        bmAttributes            5
          Transfer Type            Isochronous
          Synch Type               Asynchronous
          Usage Type               Data
        wMaxPacketSize     0x0096  1x 150 bytes
        bInterval               1
        AudioStreaming Endpoint Descriptor:
          bLength                 8
          bDescriptorType        37
          bDescriptorSubtype      1 (EP_GENERAL)
          bmAttributes         0x00
          bmControls           0x00
          bLockDelayUnits         0 Undefined
          wLockDelay         0x0000
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        3
      bAlternateSetting       0
      bNumEndpoints           2
      bInterfaceClass         1 Audio
      bInterfaceSubClass      3 MIDI Streaming
      bInterfaceProtocol      0 
      iInterface              2 
      MIDIStreaming Interface Descriptor:
        bLength                 7
        bDescriptorType        36
        bDescriptorSubtype      1 (HEADER)
        bcdADC               1.00
        wTotalLength       0x0061
      MIDIStreaming Interface Descriptor:
        bLength                 9
        bDescriptorType        36
        bDescriptorSubtype      3 (MIDI_OUT_JACK)
        bJackType               1 Embedded
        bJackID                 3
        bNrInputPins            1
        baSourceID( 0)          2
        BaSourcePin( 0)         1
        iJack                   4 
      MIDIStreaming Interface Descriptor:
        bLength                 6
        bDescriptorType        36
        bDescriptorSubtype      2 (MIDI_IN_JACK)
        bJackType               2 External
        bJackID                 2
        iJack                   4 
      MIDIStreaming Interface Descriptor:
        bLength                 9
        bDescriptorType        36
        bDescriptorSubtype      3 (MIDI_OUT_JACK)
        bJackType               1 Embedded
        bJackID                 7
        bNrInputPins            1
        baSourceID( 0)          6
        BaSourcePin( 0)         1
        iJack                   5 
      MIDIStreaming Interface Descriptor:
        bLength                 6
        bDescriptorType        36
        bDescriptorSubtype      2 (MIDI_IN_JACK)
        bJackType               2 External
        bJackID                 6
        iJack                   5 
      MIDIStreaming Interface Descriptor:
        bLength                 6
        bDescriptorType        36
        bDescriptorSubtype      2 (MIDI_IN_JACK)
        bJackType               1 Embedded
        bJackID                 1
        iJack                   4 
      MIDIStreaming Interface Descriptor:
        bLength                 9
        bDescriptorType        36
        bDescriptorSubtype      3 (MIDI_OUT_JACK)
        bJackType               2 External
        bJackID                 4
        bNrInputPins            1
        baSourceID( 0)          1
        BaSourcePin( 0)         1
        iJack                   4 
      MIDIStreaming Interface Descriptor:
        bLength                 6
        bDescriptorType        36
        bDescriptorSubtype      2 (MIDI_IN_JACK)
        bJackType               1 Embedded
        bJackID                 5
        iJack                   5 
      MIDIStreaming Interface Descriptor:
        bLength                 9
        bDescriptorType        36
        bDescriptorSubtype      3 (MIDI_OUT_JACK)
        bJackType               2 External
        bJackID                 8
        bNrInputPins            1
        baSourceID( 0)          5
        BaSourcePin( 0)         1
        iJack                   5 
      Endpoint Descriptor:
        bLength                 9
        bDescriptorType         5
        bEndpointAddress     0x07  EP 7 OUT
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0200  1x 512 bytes
        bInterval               0
        bRefresh                0
        bSynchAddress           0
        MIDIStreaming Endpoint Descriptor:
          bLength                 6
          bDescriptorType        37
          bDescriptorSubtype      1 (GENERAL)
          bNumEmbMIDIJack         2
          baAssocJackID( 0)       1
          baAssocJackID( 1)       5
      Endpoint Descriptor:
        bLength                 9
        bDescriptorType         5
        bEndpointAddress     0x86  EP 6 IN
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0200  1x 512 bytes
        bInterval               0
        bRefresh                0
        bSynchAddress           0
        MIDIStreaming Endpoint Descriptor:
          bLength                 6
          bDescriptorType        37
          bDescriptorSubtype      1 (GENERAL)
          bNumEmbMIDIJack         2
          baAssocJackID( 0)       3
          baAssocJackID( 1)       7

rsta2 Dec 27, 2022
Maintainer

Thank you! These descriptors are very different from that, what I have expected and what is supported in Circle so far. I have to think about, if and how this can be supported in Circle.

nickverlinden Dec 27, 2022
Author

just in case it could be usefull for further comparisan, here is the descriptor for the Zoom R8 in Class Compliant 2.0 mode.

Bus 001 Device 006: ID 1686:014f ZOOM Corporation ZOOM R8
Device Descriptor:
  bLength                18
  bDescriptorType         1
  bcdUSB               2.00
  bDeviceClass          239 Miscellaneous Device
  bDeviceSubClass         2 
  bDeviceProtocol         1 Interface Association
  bMaxPacketSize0        64
  idVendor           0x1686 ZOOM Corporation
  idProduct          0x014f 
  bcdDevice            1.00
  iManufacturer           1 ZOOM Corporation
  iProduct                2 ZOOM R8
  iSerial                 3 00
  bNumConfigurations      1
  Configuration Descriptor:
    bLength                 9
    bDescriptorType         2
    wTotalLength       0x0151
    bNumInterfaces          5
    bConfigurationValue     1
    iConfiguration          0 
    bmAttributes         0x80
      (Bus Powered)
    MaxPower              500mA
    Interface Association:
      bLength                 8
      bDescriptorType        11
      bFirstInterface         0
      bInterfaceCount         3
      bFunctionClass          1 Audio
      bFunctionSubClass       0 
      bFunctionProtocol      32 
      iFunction               0 
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       0
      bNumEndpoints           0
      bInterfaceClass         1 Audio
      bInterfaceSubClass      1 Control Device
      bInterfaceProtocol     32 
      iInterface              4 
      AudioControl Interface Descriptor:
        bLength                 9
        bDescriptorType        36
        bDescriptorSubtype      1 (HEADER)
        bcdADC               2.00
        bCategory               8
        wTotalLength       0x0065
        bmControls           0x00
      AudioControl Interface Descriptor:
        bLength                 8
        bDescriptorType        36
        bDescriptorSubtype     10 (CLOCK_SOURCE)
        bClockID               41
        bmAttributes            3 Internal programmable clock 
        bmControls           0x07
          Clock Frequency Control (read/write)
          Clock Validity Control (read-only)
        bAssocTerminal          0
        iClockSource            0 
      AudioControl Interface Descriptor:
        bLength                 8
        bDescriptorType        36
        bDescriptorSubtype     11 (CLOCK_SELECTOR)
        bClockID               40
        bNrInPins               1
        baCSourceID(0)         41
        bmControls           0x03
          Clock Selector Control (read/write)
        iClockSelector          0 
      AudioControl Interface Descriptor:
        bLength                17
        bDescriptorType        36
        bDescriptorSubtype      2 (INPUT_TERMINAL)
        bTerminalID             2
        wTerminalType      0x0101 USB Streaming
        bAssocTerminal          0
        bCSourceID             40
        bNrChannels             2
        bmChannelConfig    0x00000000
        iChannelNames           0 
        bmControls         0x0000
        iTerminal               0 
      AudioControl Interface Descriptor:
        bLength                18
        bDescriptorType        36
        bDescriptorSubtype      6 (FEATURE_UNIT)
        bUnitID                10
        bSourceID               2
        bmaControls(0)     0x0000000f
          Mute Control (read/write)
          Volume Control (read/write)
        bmaControls(1)     0x0000000f
          Mute Control (read/write)
          Volume Control (read/write)
        bmaControls(2)     0x0000000f
          Mute Control (read/write)
          Volume Control (read/write)
        iFeature                0 
      AudioControl Interface Descriptor:
        bLength                12
        bDescriptorType        36
        bDescriptorSubtype      3 (OUTPUT_TERMINAL)
        bTerminalID            20
        wTerminalType      0x0301 Speaker
        bAssocTerminal          0
        bSourceID              10
        bCSourceID             40
        bmControls         0x0000
        iTerminal               0 
      AudioControl Interface Descriptor:
        bLength                17
        bDescriptorType        36
        bDescriptorSubtype      2 (INPUT_TERMINAL)
        bTerminalID             3
        wTerminalType      0x0201 Microphone
        bAssocTerminal          0
        bCSourceID             40
        bNrChannels             2
        bmChannelConfig    0x00000000
        iChannelNames           0 
        bmControls         0x0000
        iTerminal               0 
      AudioControl Interface Descriptor:
        bLength                12
        bDescriptorType        36
        bDescriptorSubtype      3 (OUTPUT_TERMINAL)
        bTerminalID            21
        wTerminalType      0x0101 USB Streaming
        bAssocTerminal          0
        bSourceID               3
        bCSourceID             40
        bmControls         0x0000
        iTerminal               0 
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        1
      bAlternateSetting       0
      bNumEndpoints           0
      bInterfaceClass         1 Audio
      bInterfaceSubClass      2 Streaming
      bInterfaceProtocol     32 
      iInterface              4 
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        1
      bAlternateSetting       1
      bNumEndpoints           1
      bInterfaceClass         1 Audio
      bInterfaceSubClass      2 Streaming
      bInterfaceProtocol     32 
      iInterface              4 
      AudioStreaming Interface Descriptor:
        bLength                16
        bDescriptorType        36
        bDescriptorSubtype      1 (AS_GENERAL)
        bTerminalLink           2
        bmControls           0x00
        bFormatType             1
        bmFormats          0x00000001
          PCM
        bNrChannels             2
        bmChannelConfig    0x00000000
        iChannelNames           0 
      AudioStreaming Interface Descriptor:
        bLength                 6
        bDescriptorType        36
        bDescriptorSubtype      2 (FORMAT_TYPE)
        bFormatType             1 (FORMAT_TYPE_I)
        bSubslotSize            3
        bBitResolution         24
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x01  EP 1 OUT
        bmAttributes           13
          Transfer Type            Isochronous
          Synch Type               Synchronous
          Usage Type               Data
        wMaxPacketSize     0x0100  1x 256 bytes
        bInterval               1
        AudioStreaming Endpoint Descriptor:
          bLength                 8
          bDescriptorType        37
          bDescriptorSubtype      1 (EP_GENERAL)
          bmAttributes         0x00
          bmControls           0x00
          bLockDelayUnits         2 Decoded PCM samples
          wLockDelay         0x0008
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        2
      bAlternateSetting       0
      bNumEndpoints           0
      bInterfaceClass         1 Audio
      bInterfaceSubClass      2 Streaming
      bInterfaceProtocol     32 
      iInterface              4 
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        2
      bAlternateSetting       1
      bNumEndpoints           1
      bInterfaceClass         1 Audio
      bInterfaceSubClass      2 Streaming
      bInterfaceProtocol     32 
      iInterface              4 
      AudioStreaming Interface Descriptor:
        bLength                16
        bDescriptorType        36
        bDescriptorSubtype      1 (AS_GENERAL)
        bTerminalLink          21
        bmControls           0x00
        bFormatType             1
        bmFormats          0x00000001
          PCM
        bNrChannels             2
        bmChannelConfig    0x00000000
        iChannelNames           0 
      AudioStreaming Interface Descriptor:
        bLength                 6
        bDescriptorType        36
        bDescriptorSubtype      2 (FORMAT_TYPE)
        bFormatType             1 (FORMAT_TYPE_I)
        bSubslotSize            3
        bBitResolution         24
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x82  EP 2 IN
        bmAttributes           13
          Transfer Type            Isochronous
          Synch Type               Synchronous
          Usage Type               Data
        wMaxPacketSize     0x0100  1x 256 bytes
        bInterval               1
        AudioStreaming Endpoint Descriptor:
          bLength                 8
          bDescriptorType        37
          bDescriptorSubtype      1 (EP_GENERAL)
          bmAttributes         0x00
          bmControls           0x00
          bLockDelayUnits         2 Decoded PCM samples
          wLockDelay         0x0008
    Interface Association:
      bLength                 8
      bDescriptorType        11
      bFirstInterface         3
      bInterfaceCount         2
      bFunctionClass          1 Audio
      bFunctionSubClass       0 
      bFunctionProtocol       0 
      iFunction               0 
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        3
      bAlternateSetting       0
      bNumEndpoints           0
      bInterfaceClass         1 Audio
      bInterfaceSubClass      1 Control Device
      bInterfaceProtocol      0 
      iInterface              0 
      AudioControl Interface Descriptor:
        bLength                 9
        bDescriptorType        36
        bDescriptorSubtype      1 (HEADER)
        bcdADC               1.00
        wTotalLength       0x0009
        bInCollection           1
        baInterfaceNr(0)        4
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        4
      bAlternateSetting       0
      bNumEndpoints           2
      bInterfaceClass         1 Audio
      bInterfaceSubClass      3 MIDI Streaming
      bInterfaceProtocol      0 
      iInterface              0 
      MIDIStreaming Interface Descriptor:
        bLength                 7
        bDescriptorType        36
        bDescriptorSubtype      1 (HEADER)
        bcdADC               1.00
        wTotalLength       0x0025
      MIDIStreaming Interface Descriptor:
        bLength                 6
        bDescriptorType        36
        bDescriptorSubtype      2 (MIDI_IN_JACK)
        bJackType               1 Embedded
        bJackID                10
        iJack                   0 
      MIDIStreaming Interface Descriptor:
        bLength                 6
        bDescriptorType        36
        bDescriptorSubtype      2 (MIDI_IN_JACK)
        bJackType               2 External
        bJackID                30
        iJack                   0 
      MIDIStreaming Interface Descriptor:
        bLength                 9
        bDescriptorType        36
        bDescriptorSubtype      3 (MIDI_OUT_JACK)
        bJackType               1 Embedded
        bJackID                20
        bNrInputPins            1
        baSourceID( 0)         30
        BaSourcePin( 0)         1
        iJack                   0 
      MIDIStreaming Interface Descriptor:
        bLength                 9
        bDescriptorType        36
        bDescriptorSubtype      3 (MIDI_OUT_JACK)
        bJackType               2 External
        bJackID                40
        bNrInputPins            1
        baSourceID( 0)         10
        BaSourcePin( 0)         1
        iJack                   0 
      Endpoint Descriptor:
        bLength                 9
        bDescriptorType         5
        bEndpointAddress     0x03  EP 3 OUT
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0200  1x 512 bytes
        bInterval               0
        bRefresh                0
        bSynchAddress           0
        MIDIStreaming Endpoint Descriptor:
          bLength                 5
          bDescriptorType        37
          bDescriptorSubtype      1 (GENERAL)
          bNumEmbMIDIJack         1
          baAssocJackID( 0)      10
      Endpoint Descriptor:
        bLength                 9
        bDescriptorType         5
        bEndpointAddress     0x84  EP 4 IN
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0200  1x 512 bytes
        bInterval               0
        bRefresh                0
        bSynchAddress           0
        MIDIStreaming Endpoint Descriptor:
          bLength                 5
          bDescriptorType        37
          bDescriptorSubtype      1 (GENERAL)
          bNumEmbMIDIJack         1
          baAssocJackID( 0)      20

nickverlinden Dec 27, 2022
Author

if desired I can also provide descriptors for the Presonus StudioLive 24R, which is also a pro audio interface. Let me know!

rsta2 Dec 28, 2022
Maintainer

Thank you, I will come back on this later.

rsta2 · 2022-12-28T06:08:01Z

rsta2
Dec 28, 2022
Maintainer

There is an update on the usbaudio-24bits branch, which may fix the problem with the RME Babyface Pro. Of course I cannot test it here. There was a problem in a descriptor for the output terminal "Speaker", which references a source ID (2), which does not exist. I found a similar issue here. Now you should get a warning "Source entity not found (2)", but the USB audio streaming driver should load. I'm not totally sure, if it will work then, because the feedback endpoint specifies an interval of 4, and I can only test 1 here, but please test it with the Babyface Pro.

4 replies

nickverlinden Dec 28, 2022
Author

Some good news, the Babyface Pro now works with sample 34-sounddevices, I can see the output led meters on theBabyface Pro go up on output 1&2 when running the sample. Unfortunately it is dropping sound (at least the sample outputs it on the console "Sound data dropped" multiple times per second). I was not able to listen to the sound and verify if there were glitches because i didn't have an xlr cable at hand, and it was only outputting on those outputs. I wasn't able to figure out how to use the headphone jacks. According to the usb descriptor it seems that it doesn't have a headphone jack? And trying to set it using this code doesn't work:

Selecting Headphone Jack:

CSoundController *soundcontroller = m_pSound->GetController();
soundcontroller->EnableJack(CSoundController::TJack::JackHeadphone);

Console Output:

00:00:02.47 uaudiotopo: Source entity not found (2)
00:00:02.48 uaudio1-1: Output Terminal type(s): 0x301
00:00:02.48 uaudio1-1: Supported sample rate(s): 44100, 48000, 88200, 96000, 176400, 192000 Hz
00:00:02.49 uaudio1-2: Input Terminal type(s): 0x201
00:00:02.49 uaudio1-2: Supported sample rate(s): 44100, 48000, 88200, 96000, 176400, 192000 Hz
00:00:02.50 usbhub: Port 1: Device configured
00:00:02.51 usbhub: Port 3: Device configured
00:00:02.71 umsd: Capacity is 14800 MByte
00:00:02.72 usbhub: Port 4: Device configured
00:00:02.72 xhciroot: Port 1: Device configured

It has some on board controls, I'll check the manual if there is a way of selecting this headphone jack from the controls.

rsta2 Dec 28, 2022
Maintainer

Thanks for testing. This "Sound data dropped" message comes from kernel.cpp, where the sound data is written to the sound queue. This is not the hardware side, where the data is send to the device. With a ASUS Xonar U5, which also supports 2 channels at 24 bits, I do not get this message. I'm still searching for the reason.

No there is no headphone output terminal in the USB audio descriptors and thus, it cannot be selected from the software. I found in the Linux driver, that there are additional USB requests for this device. I currently don't know, if they can be used to select the headphone output. This is device specific and not USB audio streaming class stuff.

nickverlinden Dec 28, 2022
Author

Ok, got the babyface to output channels 1 & 2 out of headphone, it has a mode called copymode. But what is very weird is that I was only able to activate this copy mode when connecting it to my mac in cc mode. Then set the copy mode using the physical magic button combination, and plug it into the pi.

But, still getting sound drops. If I listen to it, i can hear that parts of the sine sound good, and parts of it sound clipped, and also contains small drops. I'll try to experiment with the buffer sizes, sample rates etc and get back to you.

nickverlinden Dec 28, 2022
Author

I did some testing. Good news, for sample 34-sounddevices i had previously changed WRITE_FORMAT to 2 assuming it would be better for it to match the audio interface bit depth. Changing it back to WRITE_FORMAT 1 gave me a clean sine wave through the headphones. Next i tried 41-soundinput, modified it to drain the usb input to the usb output. Changing WRITE_FORMAT to 2 kind of works, but the audio is very distorted. I tried this for both 44100 and 48000 with similar results. It almost sounds like 1 bit sound, I connected a microphone to input one and sang to myself. I could hear my voice but very distorted. It reminded me of 1 bit pcm sound coming from a pc speaker in an old 386. Interesting observation, i was watching the volume meters on the babyface and when the meters where above half i could hear sound, but if the meter was below half there was silence. So only "louder" samples came through, and those sounded distorted.

rsta2 · 2022-12-29T14:28:15Z

rsta2
Dec 29, 2022
Maintainer

Thanks for testing. I did find two problems in lib/sound/soundbasedevice.cpp, which should be responsible for the drops with WRITE_FORMAT set to 2 (sample/34-sounddevices). This should be fixed now on the branch usbaudio-24bits. I don't know, if this also helps for the problems with your modified sample/42-soundinput (may be).

6 replies

rsta2 Dec 29, 2022
Maintainer

Thanks for testing. Your diff looks all right, but I would recommend to have a look at test/sound-controller, when you have some time. That's a tool, which supports sound input and output from different devices. With start sndusb io from the provided command prompt, you can do the same as with the modified sample/42-soundinput and more. I use this tool for my own tests.

I guess, there is a problem with the isochronous feedback endpoint, which acts as a pace maker for the transferred audio data via the data endpoint. If there is something wrong with it, this will lead to the (mini) drops and to even more distortions at 44100 Hz, because this sample rate cannot be divided by the USB frame rate of 8000 without a remainder. That's why the number of transferred audio frames changes in each USB data packet, but over the time a mean number of 44100 frames have to be transferred per second. I will have a closer look on it.

nickverlinden Dec 29, 2022
Author

Very interesting, thanks. I have a strange problem (that i've had before when trying to build i2cshell), after uploading the image with flashy, the screen turns black. I don't even get the usual logger: Circle 45 started on Raspberry Pi 4 Model B over my serial cable. While typing i suddenly realised both of these are using input/console. coincidence? I just tried running 32-i2cshell, same thing, black screen (with a small white bar in the upperright corner that is not animating). Tried some other samples such as 41-screenanimations, they still run fine. Am I missing something? I'm using flashy and upload image using a serial usb adapter on GPIO 14 & 15.

rsta2 Dec 29, 2022
Maintainer

These *shell programs use the FIQ for the serial device. On the RPi 4 in AArch32 mode this requires the files armstub7-rpi4.bin (can be built in boot/) and config32.txt (renamed to config.txt) on the SD card. These programs start with log messages on the screen, but the command prompt should appear via the serial interface after a few seconds, when no USB keyboard is attached.

nickverlinden Dec 29, 2022
Author

Thx Rene, that works. For some reason this stub was missing. I created another usb boot stick some time ago and this one probably missed the copy because it was on my old stick. Anyway in the meantime I did a test with the tool. This is probably not news to you, but I can confirm the behavior is the same, tiny clicks are there at around 4 times per second.

rsta2 Dec 30, 2022
Maintainer

Good, that you have the tool working now. OK, it shows the same behavior like your modified sample/42-soundinput. This was expected.

rsta2 · 2022-12-30T12:35:55Z

rsta2
Dec 30, 2022
Maintainer

I have to admit, that the RME Babyface Pro is the first high-speed USB device, which uses an asynchronous data endpoint with a feedback endpoint, which is tested with Circle. I only had a full-speed device with this configuration here, which is different. Thus beside the 24-bit sample size, there are additional questions to answer for implementing the driver. This may require many tests.

I want to give you a warning, because this may be a long and sometimes frustrating process. And if we have this device working to some degree, there remain more open questions, like how the headphone jack can be switched on with it. Currently I have no idea, why these error messages in class 2.0 compliant mode with the ZOOM R8 occur. These devices seem to be different, even when they are compliant with the USB audio class specification.

That's why the question arises, if it is worth all the effort to get it working? My approach to deal with this problem was, that I limited the number of supported devices to those with 16-bit sample size and two channels, which are often relatively simple full speed devices, which should work with Circle. I cannot say, how long it will take, before one or more Pro interfaces are really working successfully and if a specific interface can be supported.

There is a small fix on the branch usbaudio-24bits. I'm afraid, this won't be enough to get the RME Babyface Pro working, but I'm not sure. So if you want to test it, please do.

4 replies

nickverlinden Dec 30, 2022
Author

Thx for the elaborate answer. For me personally, there is not an immediate use for the usb device support. The devices i'm currently working on both have i2s in and output. I got the octo working, i got the external clock working for the pcm1808 so for me it works out with what is already working in circle. The idea of having usb audio interface support sounds amazing and very convenient since they have good headphone amps, mic preamps, high quality dacs, ... you name it. However, the reality seems that this is no easy task.

I'm willing to help with all the testing as much as needed to get it to work but only if you see that it is usefull for the future of circle. I would do it for the community, but not so much for myself at this moment.

I will test the latest small patch today :-)

nickverlinden Dec 30, 2022
Author

just did a test with the small patch, but no change.

osc sine 500

sounds fine though, so i think we can take away from this that you got output working fine.

rsta2 Dec 30, 2022
Maintainer

Your testing work is a great help. Thank you very much! So if the output is working, I will think about, what can be done for the input. When I'll have an idea, we can continue. Yes, of course it would be great to get some of these Pro interfaces supported.

nickverlinden Dec 30, 2022
Author

No thanks needed, i'm glad i can do something for Circle.
I'd be happy to continue testing! Let me know :-)

rsta2 · 2023-01-01T22:40:49Z

rsta2
Jan 1, 2023
Maintainer

Happy new year to all!

Hi Nick, I did recognize, that the ASUS Xonar U5, which I have here, has a very similar endpoint configuration for input like the RME Babyface Pro (2 channels with 24 bit resolution, 3 bytes per sample, isochronous asynchronous data endpoint, interval 1). When I build the sound-controller tool with this Config.mk:

PREFIX = arm-none-eabi-
AARCH = 32
RASPPI = 4
DEFINE += -DREALTIME

and enter at the command prompt:

start sndusb i
start sndpwm

I get a clean sound on the 3.5" headphone jack on the RPi board. Can you please try this. If this works, but not, when the output is via the Babyface Pro itself, there may be some interference between the USB input and output direction.

Another reason for the "mini" drops in the audio may be, that the USB receiver cannot provide enough data on input for the USB transmitter on output over the time. Perhaps this can be checked, when the test above would be OK, by starting the transmitter after the receiver with:

start sndusb i
start sndusb o

You can also increase the parameter QUEUE_SIZE_MSECS to up to 1000 in config.h before build. This may have an influence on the drops? The idea is, that the receiver can already fill the sound queue, before the transmitter is reading data from this queue, so that the timing changes.

9 replies

rsta2 Jan 2, 2023
Maintainer

There seems to be a general timing problem at 44100 Hz sample rate. Unfortunately I cannot reproduce this with my ASUS Xonar U5, which has a quite similar endpoint configuration like the ZOOM R8. I noticed some harmonic distortion with 24 bits sample size now, but not much. Yes, the timing at 44100 is more fragile than at 48000.

nickverlinden Jan 4, 2023
Author

Tonight i'm going to retry with sndpwm and another pi 4 i borrowed from a friend. Would it help you to borrow my Babyface Pro? I'm not currently using it.

rsta2 Jan 4, 2023
Maintainer

I'm afraid with sndpwm we will get the same result as with sndi2s. Thanks for the offer, but normally I'm not a friend of sending such expensive hardware around. It may be lost or broken and I don't want to be responsible for this. Unfortunately currently I do not have an idea, what to change to fix the problems. Maybe we should let that rest for a while.

nickverlinden Jan 4, 2023
Author

You are right, same result for sndpwm. Ok I understand, no worries. If you ever need it, feel free to contact me directly. Sure thing, you already got 24bit in and out working perfactly at 48khz on the zoom R8 so probably many more interfaces are already supported now. I imagine not many people possess an interface such as the Babyface Pro that will end up using Circle in some way or form so you might as wel just wait until more questions about those kinds of interfaces come in. Thx for the hard work Rene, and if you want to continue in the future, i'd be happy to test for you. Cheers!

rsta2 Jan 5, 2023
Maintainer

Thank you Nick. I agree, this is already an improvement and I will probably merge this soon to the develop branch, after adapting sample/29-miniorgan, which does only work with 16-bits sample size so far. Thanks for the testing work, I will come back on you. Cheers!

rsta2 · 2023-01-08T13:32:21Z

rsta2
Jan 8, 2023
Maintainer

The branch usbaudio-24bits has been merged to develop. The harmonic distortion I noticed earlier, was caused by damaged headphones, how it turned out. This was not the final step for audio development. Next planned is scaling up the number of supported channels from Stereo.

1 reply

nickverlinden Jan 14, 2023
Author

Super, thx! Let me know if I can do some more testing for you. Happy to help!

rsta2 · 2023-02-22T12:05:02Z

rsta2
Feb 22, 2023
Maintainer

This took a while, but now there is support for up to 32 audio (aka sound) channels on the branch sound-more-channels.

For USB audio streaming devices you have to configure the expected number of channels for output and input with the option usbsoundchannels=NUM,NUM in the file cmdline.txt. Please read this for further info about this option. The bit size of one sample still has to be set using soundopt=NUM.

The program test/sound-controller can be used for test. The other samples have not been updated yet. You should set the value WRITE_CHANNELS to the number of output channels of the used audio device in the file test/sound-controller/config.h before build.

0 replies

nickverlinden · 2023-02-26T21:39:29Z

nickverlinden
Feb 26, 2023
Author

I will try this tomorrow evening with my Presonus StudioLive 24R, but I suspect it will not work because the Presonus only has a 64 channel interface in the usb descriptor last time we checked. It's because it's a Dante device, which is a network protocol for audio transport. I don't really know if all Dante devices always expose 64 channels, or if it's specific to the StudioLive series products. The Babyface pro also had a 12 channel interface, but i think it contains 8 ADAT channels. I don't have any other adat devices, so I might not be able to verify that. Anyway, i'll give it a shot. I'll let you know!

2 replies

rsta2 Feb 27, 2023
Maintainer

Yes, I'm aware that 64 channel interfaces will not work. Unfortunately I cannot see a use case for interfaces with that much channels for Circle. I don't think, that somebody will write a sequencer or something like that using Circle. I also guess, that 64 channels are too much for the USB host controller driver in Circle. The USB audio streaming specification defines only 28 channels and 32 is already above this limit.

nickverlinden Feb 27, 2023
Author

Yes i agree this will be highly unlikey. Let me check if i can find some other interfaces with multiple channels i can test this with, maybe at work. The Babyface might not be a good one because of the issues with the small drops. My zoom r8 only has 2 in, 2 out. A friend of mine has a zoom L12, which i believe has multiple channels over usb. Maybe I can borrow it.

dwhinham · 2023-02-27T21:29:14Z

dwhinham
Feb 27, 2023

Hi Rene,

Thank you for your hard work on adding USB audio support, it cannot have been easy!

I've been testing it with the Dirtywave M8 tracker. The M8 is an interesting device - it is a pocket synthesizer/sequencer with USB audio input and output as well as USB MIDI. It also has analog audio in/out and TRS minijack MIDI, and all can be used together at the same time.

I believe it is based on a Teensy microcontroller and using its USB stack. It provides CDC and MIDI USB functions in addition to audio; CDC is used for firmware updates.

Attaching it to a RPi via USB and using MIDI to control mt32-pi, for example, and have the RPi send the audio back digitally all via one cable would be very cool.

Currently this device fails to initialize because:

The pEndpointDesc->bInterval condition here fails because the endpoint bInterval value is 4. Of course this is currently a // TODO.
On line 308, GetFunction(0) fails because the audio control interface is not at index 0.

If I comment out the bInterval check and hard-code the GetFunction() call to be 2 instead of 0, we get a bit further, but eventually fail with an XHCI transfer error.

So far I've tested this on a CM4 with I/O board and using the USE_XHCI_INTERNAL sysconfig setting. I can switch over to a regular Pi 4 if you think it will make any difference.

I'm not sure what it would take to support it, but here is a 34-snddevices log (with the above hacks) and a Linux USB descriptor dump in case you can see anything interesting.

Cheers 🙂

Circle 34-snddevices log

logger: Circle 45.1 started on Compute Module 4 (AArch64)
00:00:00.66 timer: SpeedFactor is 1.51
00:00:01.09 usbdev1: Device ven424-2514, dev9-0-2 found (HS)
00:00:01.14 usbdev1: Interface int9-0-1 found
00:00:01.14 usbdev1: Function is not supported
00:00:01.15 usbdev1: Interface int9-0-2 found
00:00:01.15 usbdev1: Using device/interface int9-0-2
00:00:01.83 usbdev1-2: Device ven16c0-48a, devef-2-1 found (HS)
00:00:01.83 usbdev1-2: Product: DirtyWave M8
00:00:01.89 usbdev1-2: Interface int2-2-1 found
00:00:01.89 usbdev1-2: Using device/interface int2-2-1
00:00:01.89 usbdev1-2: Interface int1-3-0 found
00:00:01.90 usbdev1-2: Using device/interface int1-3-0
00:00:01.90 usbdev1-2: Interface int1-1-0 found
00:00:01.91 usbdev1-2: Using device/interface int1-1-0
00:00:01.91 usbdev1-2: Interface int1-2-0 found
00:00:01.91 usbdev1-2: Using device/interface int1-2-0
00:00:01.92 usbdev1-2: Cannot initialize function
00:00:01.92 usbdev1-2: Interface int1-2-0 found
00:00:01.93 usbdev1-2: Using device/interface int1-2-0
00:00:01.93 usbdev1-2: Interface int1-2-0 found
00:00:01.94 usbdev1-2: Using device/interface int1-2-0
00:00:01.94 usbdev1-2: Cannot initialize function
00:00:01.95 usbdev1-2: Interface int1-2-0 found
00:00:01.95 usbdev1-2: Using device/interface int1-2-0
00:00:01.97 uaudio1-1: Input Terminal type(s): 0x602
00:00:01.97 uaudio1-1: Supported sample rate(s): 44100 Hz
00:00:02.03 uaudio1-2: Output Terminal type(s): 0x602
00:00:02.03 uaudio1-2: Supported sample rate(s): 44100 Hz
00:00:02.04 usbhub: Port 2: Device configured
00:00:02.04 xhciroot: Port 1: Device configured
00:00:02.05 kernel: Compile time: Feb 27 2023 20:54:07
00:00:02.05 xhciep: Transfer error 6 on endpoint 1
00:00:02.06 uaudio1-2: Cannot set sample rate
00:00:02.06 sndusb: USB audio device setup failed
00:00:02.07 kernel: Cannot start sound device

Dirtywave M8 lsusb dump

Bus 001 Device 083: ID 16c0:048a Van Ooijen Technische Informatica M8
Device Descriptor:
  bLength                18
  bDescriptorType         1
  bcdUSB               2.00
  bDeviceClass          239 Miscellaneous Device
  bDeviceSubClass         2 
  bDeviceProtocol         1 Interface Association
  bMaxPacketSize0        64
  idVendor           0x16c0 Van Ooijen Technische Informatica
  idProduct          0x048a 
  bcdDevice            2.79
  iManufacturer           1 DirtyWave
  iProduct                2 M8
  iSerial                 3 9488720
  bNumConfigurations      1
  Configuration Descriptor:
    bLength                 9
    bDescriptorType         2
    wTotalLength       0x0155
    bNumInterfaces          6
    bConfigurationValue     1
    iConfiguration          0 
    bmAttributes         0xc0
      Self Powered
    MaxPower              100mA
    Interface Association:
      bLength                 8
      bDescriptorType        11
      bFirstInterface         0
      bInterfaceCount         2
      bFunctionClass          2 Communications
      bFunctionSubClass       2 Abstract (modem)
      bFunctionProtocol       1 AT-commands (v.25ter)
      iFunction               0 
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       0
      bNumEndpoints           1
      bInterfaceClass         2 Communications
      bInterfaceSubClass      2 Abstract (modem)
      bInterfaceProtocol      1 AT-commands (v.25ter)
      iInterface              0 
      CDC Header:
        bcdCDC               1.10
      CDC Call Management:
        bmCapabilities       0x01
          call management
        bDataInterface          1
      CDC ACM:
        bmCapabilities       0x06
          sends break
          line coding and serial state
      CDC Union:
        bMasterInterface        0
        bSlaveInterface         1 
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x82  EP 2 IN
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0010  1x 16 bytes
        bInterval               5
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        1
      bAlternateSetting       0
      bNumEndpoints           2
      bInterfaceClass        10 CDC Data
      bInterfaceSubClass      0 
      bInterfaceProtocol      0 
      iInterface              0 
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x03  EP 3 OUT
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0200  1x 512 bytes
        bInterval               0
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x83  EP 3 IN
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0200  1x 512 bytes
        bInterval               0
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        2
      bAlternateSetting       0
      bNumEndpoints           2
      bInterfaceClass         1 Audio
      bInterfaceSubClass      3 MIDI Streaming
      bInterfaceProtocol      0 
      iInterface              0 
      MIDIStreaming Interface Descriptor:
        bLength                 7
        bDescriptorType        36
        bDescriptorSubtype      1 (HEADER)
        bcdADC               1.00
        wTotalLength       0x0025
      MIDIStreaming Interface Descriptor:
        bLength                 6
        bDescriptorType        36
        bDescriptorSubtype      2 (MIDI_IN_JACK)
        bJackType               1 Embedded
        bJackID                 1
        iJack                   0 
      MIDIStreaming Interface Descriptor:
        bLength                 6
        bDescriptorType        36
        bDescriptorSubtype      2 (MIDI_IN_JACK)
        bJackType               2 External
        bJackID                 2
        iJack                   0 
      MIDIStreaming Interface Descriptor:
        bLength                 9
        bDescriptorType        36
        bDescriptorSubtype      3 (MIDI_OUT_JACK)
        bJackType               1 Embedded
        bJackID                 3
        bNrInputPins            1
        baSourceID( 0)          2
        BaSourcePin( 0)         1
        iJack                   0 
      MIDIStreaming Interface Descriptor:
        bLength                 9
        bDescriptorType        36
        bDescriptorSubtype      3 (MIDI_OUT_JACK)
        bJackType               2 External
        bJackID                 4
        bNrInputPins            1
        baSourceID( 0)          1
        BaSourcePin( 0)         1
        iJack                   0 
      Endpoint Descriptor:
        bLength                 9
        bDescriptorType         5
        bEndpointAddress     0x04  EP 4 OUT
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0200  1x 512 bytes
        bInterval               0
        bRefresh                0
        bSynchAddress           0
        MIDIStreaming Endpoint Descriptor:
          bLength                 5
          bDescriptorType        37
          bDescriptorSubtype      1 (GENERAL)
          bNumEmbMIDIJack         1
          baAssocJackID( 0)       1
      Endpoint Descriptor:
        bLength                 9
        bDescriptorType         5
        bEndpointAddress     0x84  EP 4 IN
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0200  1x 512 bytes
        bInterval               0
        bRefresh                0
        bSynchAddress           0
        MIDIStreaming Endpoint Descriptor:
          bLength                 5
          bDescriptorType        37
          bDescriptorSubtype      1 (GENERAL)
          bNumEmbMIDIJack         1
          baAssocJackID( 0)       3
    Interface Association:
      bLength                 8
      bDescriptorType        11
      bFirstInterface         3
      bInterfaceCount         3
      bFunctionClass          1 Audio
      bFunctionSubClass       1 Control Device
      bFunctionProtocol       0 
      iFunction               0 
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        3
      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       0x003e
        bInCollection           2
        baInterfaceNr(0)        4
        baInterfaceNr(1)        5
      AudioControl Interface Descriptor:
        bLength                12
        bDescriptorType        36
        bDescriptorSubtype      2 (INPUT_TERMINAL)
        bTerminalID             1
        wTerminalType      0x0602 Digital Audio Interface
        bAssocTerminal          0
        bNrChannels             2
        wChannelConfig     0x0003
          Left Front (L)
          Right Front (R)
        iChannelNames           0 
        iTerminal               0 
      AudioControl Interface Descriptor:
        bLength                 9
        bDescriptorType        36
        bDescriptorSubtype      3 (OUTPUT_TERMINAL)
        bTerminalID             2
        wTerminalType      0x0101 USB Streaming
        bAssocTerminal          0
        bSourceID               1
        iTerminal               0 
      AudioControl Interface Descriptor:
        bLength                12
        bDescriptorType        36
        bDescriptorSubtype      2 (INPUT_TERMINAL)
        bTerminalID             3
        wTerminalType      0x0101 USB Streaming
        bAssocTerminal          0
        bNrChannels             2
        wChannelConfig     0x0003
          Left Front (L)
          Right Front (R)
        iChannelNames           0 
        iTerminal               0 
      AudioControl Interface Descriptor:
        bLength                10
        bDescriptorType        36
        bDescriptorSubtype      6 (FEATURE_UNIT)
        bUnitID                49
        bSourceID               3
        bControlSize            1
        bmaControls(0)       0x01
          Mute Control
        bmaControls(1)       0x02
          Volume Control
        bmaControls(2)       0x02
          Volume Control
        iFeature                0 
      AudioControl Interface Descriptor:
        bLength                 9
        bDescriptorType        36
        bDescriptorSubtype      3 (OUTPUT_TERMINAL)
        bTerminalID             4
        wTerminalType      0x0602 Digital Audio Interface
        bAssocTerminal          0
        bSourceID              49
        iTerminal               0 
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        4
      bAlternateSetting       0
      bNumEndpoints           0
      bInterfaceClass         1 Audio
      bInterfaceSubClass      2 Streaming
      bInterfaceProtocol      0 
      iInterface              0 
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        4
      bAlternateSetting       1
      bNumEndpoints           1
      bInterfaceClass         1 Audio
      bInterfaceSubClass      2 Streaming
      bInterfaceProtocol      0 
      iInterface              0 
      AudioStreaming Interface Descriptor:
        bLength                 7
        bDescriptorType        36
        bDescriptorSubtype      1 (AS_GENERAL)
        bTerminalLink           2
        bDelay                  3 frames
        wFormatTag         0x0001 PCM
      AudioStreaming Interface Descriptor:
        bLength                11
        bDescriptorType        36
        bDescriptorSubtype      2 (FORMAT_TYPE)
        bFormatType             1 (FORMAT_TYPE_I)
        bNrChannels             2
        bSubframeSize           2
        bBitResolution         16
        bSamFreqType            1 Discrete
        tSamFreq[ 0]        44100
      Endpoint Descriptor:
        bLength                 9
        bDescriptorType         5
        bEndpointAddress     0x85  EP 5 IN
        bmAttributes            9
          Transfer Type            Isochronous
          Synch Type               Adaptive
          Usage Type               Data
        wMaxPacketSize     0x00b4  1x 180 bytes
        bInterval               4
        bRefresh                0
        bSynchAddress           0
        AudioStreaming Endpoint Descriptor:
          bLength                 7
          bDescriptorType        37
          bDescriptorSubtype      1 (EP_GENERAL)
          bmAttributes         0x00
          bLockDelayUnits         0 Undefined
          wLockDelay         0x0000
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        5
      bAlternateSetting       0
      bNumEndpoints           0
      bInterfaceClass         1 Audio
      bInterfaceSubClass      2 Streaming
      bInterfaceProtocol      0 
      iInterface              0 
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        5
      bAlternateSetting       1
      bNumEndpoints           2
      bInterfaceClass         1 Audio
      bInterfaceSubClass      2 Streaming
      bInterfaceProtocol      0 
      iInterface              0 
      AudioStreaming Interface Descriptor:
        bLength                 7
        bDescriptorType        36
        bDescriptorSubtype      1 (AS_GENERAL)
        bTerminalLink           3
        bDelay                  3 frames
        wFormatTag         0x0001 PCM
      AudioStreaming Interface Descriptor:
        bLength                11
        bDescriptorType        36
        bDescriptorSubtype      2 (FORMAT_TYPE)
        bFormatType             1 (FORMAT_TYPE_I)
        bNrChannels             2
        bSubframeSize           2
        bBitResolution         16
        bSamFreqType            1 Discrete
        tSamFreq[ 0]        44100
      Endpoint Descriptor:
        bLength                 9
        bDescriptorType         5
        bEndpointAddress     0x05  EP 5 OUT
        bmAttributes            5
          Transfer Type            Isochronous
          Synch Type               Asynchronous
          Usage Type               Data
        wMaxPacketSize     0x00b4  1x 180 bytes
        bInterval               4
        bRefresh                0
        bSynchAddress         134
        AudioStreaming Endpoint Descriptor:
          bLength                 7
          bDescriptorType        37
          bDescriptorSubtype      1 (EP_GENERAL)
          bmAttributes         0x00
          bLockDelayUnits         0 Undefined
          wLockDelay         0x0000
      Endpoint Descriptor:
        bLength                 9
        bDescriptorType         5
        bEndpointAddress     0x86  EP 6 IN
        bmAttributes           17
          Transfer Type            Isochronous
          Synch Type               None
          Usage Type               Feedback
        wMaxPacketSize     0x0004  1x 4 bytes
        bInterval               4
        bRefresh                7
        bSynchAddress           0
Device Qualifier (for other device speed):
  bLength                10
  bDescriptorType         6
  bcdUSB               2.00
  bDeviceClass          239 Miscellaneous Device
  bDeviceSubClass         2 
  bDeviceProtocol         1 Interface Association
  bMaxPacketSize0        64
  bNumConfigurations      1
Device Status:     0x0000
  (Bus Powered)

6 replies

dwhinham Feb 28, 2023

Unfortunately these devices vary very much and when one device is working, that does not mean, that all others will work too.

Absolutely, I've seen enough of the Linux kernel source code to notice that USB device support is a minefield of quirks, exceptions and workarounds(!) 😅

Sorry, I forgot to mention that the above log is actually after I already changed it to 44100 Hz.
Before, I was getting the log warning saying Sample rate is not supported (48000), which makes sense.

rsta2 Feb 28, 2023
Maintainer

Ah, OK. No problem. The device answers the request to set the sample rate with a STALL. Perhaps it does not support this request, because it only supports one sample rate. For a test you could comment out the code, which sends this request here.

dwhinham Mar 4, 2023

That worked!

After commenting out the code that sets the sample rate, the M8 began to receive and play a tone from the Pi:

The shape of the waveform suggests it is receiving the sine tone data at 1/4 of the rate it expects - I guess this is because of the device's bInterval being 4 where Circle currently only supports 1.

rsta2 Mar 5, 2023
Maintainer

Good. Supporting a bInterval different from 1 requires some research work for the xHCI driver and some time. I will come back on it. Thanks for testing!

rsta2 Mar 15, 2023
Maintainer

@dwhinham I've added support for bInterval != 1 on the sound-more-channels branch. Also all other necessary modifications for the M8 are included. Unfortunately it does not work with USE_XHCI_INTERNAL (CM4) yet, and I was able to test it with bInterval == 1 only. You can test it with sample/34-sounddevices and/or test/soundcontroller.

rsta2 · 2023-03-09T14:41:52Z

rsta2
Mar 9, 2023
Maintainer

Unfortunately I noticed a severe problem in the USB audio streaming support. Even the version released with Circle 45.1 does not work reliable any more with my test devices. I believed, I had tested this sufficiently and don't understand this at the moment. Unfortunately it does not make sense to continue with USB audio support from here, before this is sorted out.

4 replies

nickverlinden Mar 10, 2023
Author

Let me know if i can help to test with the Zoom R8 and the Babyface Pro. Good luck Rene, seems like it's no easy task.

rsta2 Mar 11, 2023
Maintainer

Thanks Nick.

rsta2 Mar 14, 2023
Maintainer

The problem has been sorted out. It affected only one of my test devices, which was delivering small chunks of sounds on USB audio input, which were interrupted by small pauses. How it turned out this was volume depended. That's why I didn't noticed this in my release tests, where the input volume was probably too low for the problem to arise. The device has an "Automatic Gain Control" feature unit and I guess, it causes this behavior, which is also shown, when the device is connected to a desktop PC running Linux. I did many tests and everything else worked as expected.

rsta2 Mar 14, 2023
Maintainer

@nickverlinden Nick, we can test, when the 24-bit sample and more channel support reached a reasonable state. This was for Circle 45.1, which only supports 16-bit samples and no PRO interfaces.

rsta2 · 2023-03-30T21:40:16Z

rsta2
Mar 30, 2023
Maintainer

@nickverlinden @dwhinham Hi Nick and Dale, I would like to do a test now with your device(s) and sample/34-sounddevices and/or test/sound-controller with the source code from the branch sound-more-channels. This works on the RPi 4B and CM4 here with my own devices. Thanks in advance.

12 replies

rsta2 Apr 8, 2023
Maintainer

Hi Dale, I'm curious, if the M8 works with the latest patch.

dwhinham Apr 8, 2023

cm4_m8.zip

Sorry for the delay. This is a recording of the current situation with the CM4 and USE_XHCI_INTERNAL, which almost starts off OK (with some pops) but then loses sync, with chunks of 64 samples followed by silent gaps of 256 or 192 samples. (Be careful, the noise is loud if you decide to listen to it!)

The same behaviour is observed across multiple reboots.

I will test again later tonight with the regular Raspberry Pi 4 and let you know if anything is different as I understand the USB controller is different.

Cheers

rsta2 Apr 8, 2023
Maintainer

Thank you for testing! This is not the expected behavior of course. I'm planning to provide a patch for a trace program, which records the isochronous transfers and completion events with some parameters, without disturbing the timing. I guess you have a serial interface to capture the output from the trace?

dwhinham Apr 8, 2023

That sounds good, thank you. Yes, I have some USB serial converters and can capture any log output for you, no problem.

rsta2 Apr 8, 2023
Maintainer

OK, then I will prepare this. Thank you.

rsta2 · 2023-04-09T04:31:19Z

rsta2
Apr 9, 2023
Maintainer

Hi Dale,

here comes the patch for creating a trace using sample/34-sounddevices with the M8 Tracker.

Please clone the latest version on the branch sound-more-channels and apply the patch in the attached archive using patch -p1 < trace.patch from project root.

The program runs 10 seconds, the sound stops then and the 500 trace events/lines are written to the logger. Please add the option logdev=ttyS1 as usual to cmdline.txt to be able to capture them.

Because the trace events are generated immediately before the sound stops, the sound should show the wrong behavior at that moment, so that I can see, what happens there.

Thanks in advance!

trace.zip

20 replies

dwhinham Apr 24, 2023

Hi Rene, thank you for the update - honestly there is no obligation on your part for this or any pressure from me, it's our spare-time hobby after all, so I appreciate you continuing to investigate if you have a chance and only if you want to!

It is great that you are able to reproduce it with another device - best of luck with finding the cause, I know this is a very difficult thing to debug.

I'm ready with the M8 for further tests whenever you are, if you think you may be onto something.

Thank you again!

rsta2 Apr 24, 2023
Maintainer

Hi Dale, yes of course, because it's hobby, it should be fun. But after all the work for the USB audio streaming support, it would be good to get it running. On the other hand I cannot release it (again), how it is. It is difficult to hear the distortions, but one can clearly see them in a digital capture. So, if I cannot solve this problem, it can come to the situation, that I have to put the USB audio streaming support away, and to remove it from the project, to be able to continue. But I'm not at this point yet. Thank you!

rsta2 Apr 27, 2023
Maintainer

Hi Dale, I guess I've found the reasons for the issues and fixed them on the sound-more-channels branch:

There was a "Ring Underrun" event (14) in all of the traces:

 1:  0.000023 99 00000005 00001E32 000000B0 80000000
 2:  0.000031 99 00000005 00001E32 000000B0 80000000
 3:  0.003202  1 00000005 00001E4C 000000B0 00000000
 4:  0.003212 99 00000005 00001E4C 000000B0 80000000
 5:  0.003215  1 00000005 00001E4C 000000B0 00000000
 6:  0.003223 99 00000005 00001E4C 000000B0 80000000
 7:  0.003226 14 00000005 00001E4C 00000000 00000000 <===
 8:  0.003234 99 00000005 00001E4C 000000B0 80000000
 9:  0.003676  1 00000005 00001E50 000000B0 00000000
10:  0.003684 99 00000005 00001E50 000000B0 80000000
11:  0.004673  1 00000005 00001E58 000000B0 00000000
12:  0.004681 99 00000005 00001E58 000000B0 80000000
...

I supposed this won't have an influence and the isochronous data flow will re-sync again afterwards, but this assumption was wrong. This event has to be ignored, but it wasn't. Instead it caused the completion of the next pending URB (USB request block), but the related TRB (transfer request block) was still in the xHCI transfer ring for this endpoint and was still executed later. Because of this there were not two outstanding transfers in the ring, as expected, but there were three outstanding transfers with only two data buffers, and the relation between the data buffer and the number of data bytes in the buffer got lost. So when a transfer took place for a 180 bytes packet, the data buffer was only filled with 176 valid bytes, and thus the last sample (2 * 2 bytes) was from the previous 180 bytes transfer, which used this buffer, and so it was wrong.

On audio input the wrong of the two alternating data buffers was referenced, after completing a transfer as the source for writing the received samples into the sound queue in CSoundBaseDevice. This had a similar effect like the one described before. The data in the buffer was valid, but not always the related buffer length (176 or 180 bytes). I've found this after re-reading the code carefully.

Can you please do another test with the code from the sound-more-channels branch with sample/34-sounddevices.

If this works I would like to test again after reverting commit aa03167 (the M8 workaround). I would like the check again, if we (still) really need this.

The trace patches will not work any more.

BTW. If you add the line DEFINE += -DREALTIME to the file Config.mk before build, the distortion at the beginning of the capture should also go away. You have to rebuild everything after adding this option.

Thank you in advance!

dwhinham May 2, 2023

Hi Rene,

Apologies for the delay once again, and thank you for your hard work in finding the issue! The explanation makes total sense, great catch.

I am pleased to confirm that this has resulted in a major improvement:

trace.zip

TRACE.WAV is with commit 40f1892 (thank you for the credits, by the way!)
TRACEREVERT.WAV is after doing a git revert aa03167f to undo the M8 quirk.

I did some longer recordings this time to try to ensure it stayed stable.

There appears to be no difference in behaviour between the two, so I think you are safe to revert aa03167.

The recordings are almost perfect apart from the popping that occurs every ~3.5 to ~4 seconds, but, this is also present when using the Pi 4 with M8 under Linux (referring back to the "speaker test" in this previous capture: #336 (reply in thread)).

So, I think that you can probably call this fixed, as it appears to work just as well as Linux, and the remaining issues are probably to do with the M8 firmware (broken feedback endpoint?) and/or the combination of M8 and Pi 4.

Hopefully your efforts will have significantly improved compatibility with other audio interfaces and not just the M8.

Cheers!

rsta2 May 3, 2023
Maintainer

Hi Dale,

that looks good! I agree with you, that Circle probably cannot do it better than the RPi 4 / Raspberry Pi OS / M8 combination here. I think, with the latest modifications we have a big improvement, even with other audio interfaces. I will revert the M8 quirk commit and complete the sound-more-channels branch soon. Thank you for lots of testing!

Cheers!

rsta2 · 2023-05-04T15:20:45Z

rsta2
May 4, 2023
Maintainer

@nickverlinden Hi Nick, I hope you are still tuned. After sorting out some problems with Dale, with using the Dirtywave M8 device, and after doing a number of modifications to the USB audio streaming support, it would be great to know, if it still works with your own devices (ZOOM R8, Babyface Pro, more?). The code is still on the branch sound-more-channels and all samples and tests should work. I will merge the branch to develop, when you confirm it working. I think the test with test/sound-controller, that we did before, should be sufficient. Thank you in advance!

4 replies

nickverlinden May 5, 2023
Author

Hi Rene, yes i've been following this closely. Amazing work! I'm happy to test with my interfaces, i'll get back to you in a couple of days.

rsta2 May 5, 2023
Maintainer

Great! I'm looking forward to your test results.

nickverlinden May 10, 2023
Author

I confirm all works well on my side! Babyface + Zoom R8

rsta2 May 10, 2023
Maintainer

Hi Nick, that's fine. Thank you for lots of testing, earlier and now! I have merged the branch sound-more-channels to the develop branch and removed the feature branch. Next is updating the docs.

rsta2 · 2023-05-22T10:59:19Z

rsta2
May 22, 2023
Maintainer

The recent improvements for USB audio streaming are in Circle 45.2 now. Thank you again for your valuable help!

1 reply

nickverlinden May 23, 2023
Author

Happy to help out anyway i can. Thank you again for all your hard work!

nickverlinden · 2023-08-12T09:37:23Z

nickverlinden
Aug 12, 2023
Author

@rsta2 I finally got my hands on a Tascam Model 12, which has 12 outputs and 10 inputs. It's a fantastic mixer/interface/recorder all in one. I did some tests with the latest main branch of circle, but am getting an error.

Circle crashes on a specific line which you can see in the output of the sound-controller test app. And on the display of the Tascam the message 'USB Fs mismatch' appears.

cmdline.txt

soundopt=24 usbsoundchannels=10,12

stdout

Sound Shell
Enter "help" for help!
logger: Circle 45.2 started on Raspberry Pi 4 Model B
00:00:00.66 timer: SpeedFactor is 1.51
00:00:00.73 pcie: Link up, 5.0 Gbps x1
00:00:01.14 usbdev1: Device ven2109-3431, dev9-0-1 found (HS)
00:00:01.14 usbdev1: Product: USB2.0 Hub
00:00:01.19 usbdev1: Interface int9-0-0 found
00:00:01.19 usbdev1: Using device/interface int9-0-0
00:00:01.86 usbdev1-1: Device ven644-805f, devef-2-1 found (HS)
00:00:01.86 usbdev1-1: Product: TASCAM Model 12
00:00:01.91 usbdev1-1: Interface int1-1-20 found
00:00:01.91 usbdev1-1: Using device/interface int1-1-20
00:00:01.91 usbdev1-1: Interface int1-2-20 found
00:00:01.91 usbdev1-1: Using device/interface int1-2-20
00:00:01.91 usbdev1-1: Cannot initialize function
00:00:01.91 usbdev1-1: Interface int1-2-20 found
00:00:01.91 usbdev1-1: Using device/interface int1-2-20
00:00:01.91 usbdev1-1: Alternate setting 2 ignored
00:00:01.91 usbdev1-1: Interface int1-2-20 found
00:00:01.91 usbdev1-1: Using device/interface int1-2-20
00:00:01.91 usbdev1-1: Cannot initialize function
00:00:01.91 usbdev1-1: Interface int1-2-20 found
00:00:01.91 usbdev1-1: Using device/interface int1-2-20
00:00:01.91 usbdev1-1: Alternate setting 2 ignored
00:00:01.91 usbdev1-1: Interface int1-1-0 found
00:00:01.91 usbdev1-1: Using device/interface int1-1-0
00:00:01.91 usbdev1-1: Interface int1-3-0 found
00:00:01.91 usbdev1-1: Using device/interface int1-3-0
00:00:02.07 usbdev1-3: Device ven712-9 found (FS)
00:00:02.08 usbdev1-3: Product: WaveShare WaveShare
00:00:02.13 usbdev1-3: Interface int3-0-2 found
00:00:02.13 usbdev1-3: Using device/interface int3-0-2
00:00:02.29 usbdev1-4: Device ven18a5-245 found (HS)
00:00:02.30 usbdev1-4: Product: Verbatim STORE N GO
00:00:02.35 usbdev1-4: Interface int8-6-50 found
00:00:02.35 usbdev1-4: Using device/interface int8-6-50
00:00:02.35 uaudio1-1: Input Terminal type(s): 0x201 (12 * 24 bits)
00:00:02.35 uaudio1-1: Supported sample rate(s): 44100, 48000 Hz
00:00:02.35 uaudio1-2: Output Terminal type(s): 0x301 (10 * 24 bits)
00:00:02.35 uaudio1-2: Supported sample rate(s): 44100, 48000 Hz
00:00:02.36 usbhub: Port 1: Device configured
00:00:02.36 usbhub: Port 3: Device configured
00:00:02.56 umsd: Capacity is 14800 MByte
00:00:02.57 usbhub: Port 4: Device configured
00:00:02.57 xhciroot: Port 1: Device configured
00:00:02.57 kernel: Compile time: Aug 12 2023 11:25:20
00:00:02.57 kernel: Using serial interface


Sound Shell
Enter "help" for help!

Sound IO> start sndusb io
00:00:10.58 usbsoundbasedevice.cpp(378)

15 replies

rsta2 Aug 14, 2023
Maintainer

Oops. I guess, there went something wrong, because I expected a message Chunk size NN, channels NN instead of the assertion failed message. Can it be, that the file lib/sound/soundbasedevice.cpp has not been rebuild after the patch?

nickverlinden Aug 14, 2023
Author

Sorry, my bad. I should've know because I thought to myself: 'hhmmm doesn't seem like Rene's gonna have a lot of info'.

00:00:08.77 sounddev: Chunk size 55, channels 10

rsta2 Aug 14, 2023
Maintainer

No problem. ;) Attached another patch for testing. Please undo all previous patches before applying this one. Thanks!

diff --git a/lib/usb/usbaudiostreaming.cpp b/lib/usb/usbaudiostreaming.cpp
index 67f7a51..f48056e 100644
--- a/lib/usb/usbaudiostreaming.cpp
+++ b/lib/usb/usbaudiostreaming.cpp
@@ -716,13 +716,19 @@ boolean CUSBAudioStreamingDevice::Setup (unsigned nSampleRate)
 		{
 			unsigned nUSBFrameRate = (  GetDevice ()->GetSpeed () == USBSpeedFull
 						  ? 1000 : 8000) / m_nDataIntervalFactor;
+			unsigned nFrameSize = m_nChannels * m_nSubframeSize;
 
-			m_nChunkSizeBytes =   nSampleRate * m_nChannels * m_nSubframeSize
-					    / nUSBFrameRate;
+			m_nChunkSizeBytes = nSampleRate * nFrameSize / nUSBFrameRate;
+
+			// round up to a multiple of frame size
+			m_nChunkSizeBytes += nFrameSize-1;
+			m_nChunkSizeBytes /= nFrameSize;
+			m_nChunkSizeBytes *= nFrameSize;
 		}
 		else
 		{
-			m_nChunkSizeBytes = m_pEndpointData->GetMaxPacketSize ();
+			m_nChunkSizeBytes =   m_pEndpointData->GetMaxPacketSize ()
+					    - m_pEndpointData->GetMaxPacketSize () % m_nSubframeSize;
 		}
 	}
 
diff --git a/test/sound-controller/kernel.cpp b/test/sound-controller/kernel.cpp
index 0bd54dc..9f46d01 100644
--- a/test/sound-controller/kernel.cpp
+++ b/test/sound-controller/kernel.cpp
@@ -26,7 +26,7 @@ LOGMODULE ("kernel");
 CKernel::CKernel (void)
 :	m_Screen (m_Options.GetWidth (), m_Options.GetHeight ()),
 #if RASPPI >= 4 || !defined (USE_USB_FIQ)
-	m_Serial (&m_Interrupt, TRUE),
+	m_Serial (&m_Interrupt, FALSE),
 #else
 	m_Serial (&m_Interrupt, FALSE),
 #endif

nickverlinden Aug 14, 2023
Author

Good news, 44100hz works now (all channels)! I still get the 'USB Fs mismatch' message on boot or whenever i reconnect the usb cable when the Tascam is set to 44100. If I configure sound-controller test to work in 48000hz it does not show this message (for both 44100 or 48000 on tascam). So not a blocking issue, but a little bit annoying. As I said before, the message appears immediately when circle displays the usb info on boot or when reconnecting the cable.

This is very good news for synth builders using circle, the Model 12 is very popular and is often paired with an Akai MPC. It allows you to directly record the 10 inputs on an sd card. There is also a Model 16 and Model 24 (which differ a bit internally), but can imagine these work fine too.

Again thx for all the hard work!

rsta2 Aug 14, 2023
Maintainer

Great. I added the patch on the develop branch. The "USB Fs mismatch" message may be displayed, because the test program does not immediately send audio data. The message should go away after start sndusb io, when audio data is sent.

Thank you for reporting this issue and for testing!

Supporting USB audio Pro interfaces #336

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