[alsa-devel] Echo Audio Echo 2 USB Interface
I picked up an Echo Audio Echo 2 USB Interface. The product specs list iPad support through camera connection kit, so I assume it is class compliant. http://echoaudio.com/blogs/news/6454472-echo-digital-audio-introduces-the-ec...
However, on most systems when I plug the device in, it shows up in my sound settings panel under the Input tab, but not under the Output tab.
Recording works. I can successfully record with arecord -vv -fdat -D "plughw:CARD=Audio,DEV=0" echo.wav. I also can increase the sample rate by changing the flags. I verified that the sample rate actually increases by recording a 50khz test tone into the input and examining the wave form in an editor. It's there! So this is very promising. (anyone know of a test to verify bit depth? I want to make sure it's actually recording at 24bits.)
Playback however, is nothing but trouble. Like I said, the output device doesn't show up in the Output tab in my sound settings (gnome/pulse). However, when I list devices and available PCMs with aplay -l and aplay -L the device shows up on the lists. See specimens #1, #2, and #3. When I try to play though I get about a 1/4 second of audio and then nothing, and subsequent attempts to play sound output nothing. The device then must be unplugged and plugged back in. I'm playing with the command aplay -vv foo.wav --device="plughw:CARD=Audio,DEV=0". See output screen on specimen #4.
I installed the latest kernel and had the exact same phenomenon. See specimen #5.
To move forward here. What kind of debugging tools should I use to help figure out where the problem is? Any suggestions you have to get it working?
To be sure that the device is in good working order I hooked it up to an OSX machine running 10.6.8. Everything works great with no additional drivers installed, or special configurations.
Tanks for your help,
Tristan
--------------- #1 --------------------
tristan@ilya:~$ aplay -l **** List of PLAYBACK Hardware Devices **** card 0: PCH [HDA Intel PCH], device 0: ALC259 Analog [ALC259 Analog] Subdevices: 0/1 Subdevice #0: subdevice #0 card 0: PCH [HDA Intel PCH], device 3: HDMI 0 [HDMI 0] Subdevices: 1/1 Subdevice #0: subdevice #0 card 1: Audio [Echo 2 Audio], device 0: USB Audio [USB Audio] Subdevices: 1/1 Subdevice #0: subdevice #0
tristan@ilya:~$ aplay -L default Playback/recording through the PulseAudio sound server sysdefault:CARD=PCH HDA Intel PCH, ALC259 Analog Default Audio Device front:CARD=PCH,DEV=0 HDA Intel PCH, ALC259 Analog Front speakers surround40:CARD=PCH,DEV=0 HDA Intel PCH, ALC259 Analog 4.0 Surround output to Front and Rear speakers surround41:CARD=PCH,DEV=0 HDA Intel PCH, ALC259 Analog 4.1 Surround output to Front, Rear and Subwoofer speakers surround50:CARD=PCH,DEV=0 HDA Intel PCH, ALC259 Analog 5.0 Surround output to Front, Center and Rear speakers surround51:CARD=PCH,DEV=0 HDA Intel PCH, ALC259 Analog 5.1 Surround output to Front, Center, Rear and Subwoofer speakers surround71:CARD=PCH,DEV=0 HDA Intel PCH, ALC259 Analog 7.1 Surround output to Front, Center, Side, Rear and Woofer speakers hdmi:CARD=PCH,DEV=0 HDA Intel PCH, HDMI 0 HDMI Audio Output dmix:CARD=PCH,DEV=0 HDA Intel PCH, ALC259 Analog Direct sample mixing device dmix:CARD=PCH,DEV=3 HDA Intel PCH, HDMI 0 Direct sample mixing device dsnoop:CARD=PCH,DEV=0 HDA Intel PCH, ALC259 Analog Direct sample snooping device dsnoop:CARD=PCH,DEV=3 HDA Intel PCH, HDMI 0 Direct sample snooping device hw:CARD=PCH,DEV=0 HDA Intel PCH, ALC259 Analog Direct hardware device without any conversions hw:CARD=PCH,DEV=3 HDA Intel PCH, HDMI 0 Direct hardware device without any conversions plughw:CARD=PCH,DEV=0 HDA Intel PCH, ALC259 Analog Hardware device with all software conversions plughw:CARD=PCH,DEV=3 HDA Intel PCH, HDMI 0 Hardware device with all software conversions sysdefault:CARD=Audio Echo 2 Audio, USB Audio Default Audio Device front:CARD=Audio,DEV=0 Echo 2 Audio, USB Audio Front speakers surround40:CARD=Audio,DEV=0 Echo 2 Audio, USB Audio 4.0 Surround output to Front and Rear speakers surround41:CARD=Audio,DEV=0 Echo 2 Audio, USB Audio 4.1 Surround output to Front, Rear and Subwoofer speakers surround50:CARD=Audio,DEV=0 Echo 2 Audio, USB Audio 5.0 Surround output to Front, Center and Rear speakers surround51:CARD=Audio,DEV=0 Echo 2 Audio, USB Audio 5.1 Surround output to Front, Center, Rear and Subwoofer speakers surround71:CARD=Audio,DEV=0 Echo 2 Audio, USB Audio 7.1 Surround output to Front, Center, Side, Rear and Woofer speakers iec958:CARD=Audio,DEV=0 Echo 2 Audio, USB Audio IEC958 (S/PDIF) Digital Audio Output dmix:CARD=Audio,DEV=0 Echo 2 Audio, USB Audio Direct sample mixing device dsnoop:CARD=Audio,DEV=0 Echo 2 Audio, USB Audio Direct sample snooping device hw:CARD=Audio,DEV=0 Echo 2 Audio, USB Audio Direct hardware device without any conversions plughw:CARD=Audio,DEV=0 Echo 2 Audio, USB Audio Hardware device with all software conversions
--------------- #2 --------------------
tristan@ilya:~$ arecord -l **** List of CAPTURE Hardware Devices **** card 0: PCH [HDA Intel PCH], device 0: ALC259 Analog [ALC259 Analog] Subdevices: 1/1 Subdevice #0: subdevice #0 card 1: Audio [Echo 2 Audio], device 0: USB Audio [USB Audio] Subdevices: 1/1 Subdevice #0: subdevice #0
tristan@ilya:~$ arecord -L default Playback/recording through the PulseAudio sound server sysdefault:CARD=PCH HDA Intel PCH, ALC259 Analog Default Audio Device front:CARD=PCH,DEV=0 HDA Intel PCH, ALC259 Analog Front speakers surround40:CARD=PCH,DEV=0 HDA Intel PCH, ALC259 Analog 4.0 Surround output to Front and Rear speakers surround41:CARD=PCH,DEV=0 HDA Intel PCH, ALC259 Analog 4.1 Surround output to Front, Rear and Subwoofer speakers surround50:CARD=PCH,DEV=0 HDA Intel PCH, ALC259 Analog 5.0 Surround output to Front, Center and Rear speakers surround51:CARD=PCH,DEV=0 HDA Intel PCH, ALC259 Analog 5.1 Surround output to Front, Center, Rear and Subwoofer speakers surround71:CARD=PCH,DEV=0 HDA Intel PCH, ALC259 Analog 7.1 Surround output to Front, Center, Side, Rear and Woofer speakers dmix:CARD=PCH,DEV=0 HDA Intel PCH, ALC259 Analog Direct sample mixing device dsnoop:CARD=PCH,DEV=0 HDA Intel PCH, ALC259 Analog Direct sample snooping device hw:CARD=PCH,DEV=0 HDA Intel PCH, ALC259 Analog Direct hardware device without any conversions plughw:CARD=PCH,DEV=0 HDA Intel PCH, ALC259 Analog Hardware device with all software conversions sysdefault:CARD=Audio Echo 2 Audio, USB Audio Default Audio Device front:CARD=Audio,DEV=0 Echo 2 Audio, USB Audio Front speakers surround40:CARD=Audio,DEV=0 Echo 2 Audio, USB Audio 4.0 Surround output to Front and Rear speakers surround41:CARD=Audio,DEV=0 Echo 2 Audio, USB Audio 4.1 Surround output to Front, Rear and Subwoofer speakers surround50:CARD=Audio,DEV=0 Echo 2 Audio, USB Audio 5.0 Surround output to Front, Center and Rear speakers surround51:CARD=Audio,DEV=0 Echo 2 Audio, USB Audio 5.1 Surround output to Front, Center, Rear and Subwoofer speakers surround71:CARD=Audio,DEV=0 Echo 2 Audio, USB Audio 7.1 Surround output to Front, Center, Side, Rear and Woofer speakers iec958:CARD=Audio,DEV=0 Echo 2 Audio, USB Audio IEC958 (S/PDIF) Digital Audio Output dmix:CARD=Audio,DEV=0 Echo 2 Audio, USB Audio Direct sample mixing device dsnoop:CARD=Audio,DEV=0 Echo 2 Audio, USB Audio Direct sample snooping device hw:CARD=Audio,DEV=0 Echo 2 Audio, USB Audio Direct hardware device without any conversions plughw:CARD=Audio,DEV=0 Echo 2 Audio, USB Audio Hardware device with all software conversions
---------------- #3 -------------------
tristan@ilya:/proc/asound/card1$ cat stream0 ECHO Digital Audio Echo 2 Audio at usb-0000:00:14.0-1, high speed : USB Audio
Playback: Status: Stop Interface 1 Altset 1 Format: S32_LE Channels: 4 Endpoint: 1 OUT (ASYNC) Rates: 44100, 48000, 88200, 96000, 176400, 192000 Data packet interval: 125 us
Capture: Status: Stop Interface 2 Altset 1 Format: S32_LE Channels: 2 Endpoint: 2 IN (ASYNC) Rates: 44100, 48000, 88200, 96000, 176400, 192000 Data packet interval: 125 us
------------------- #4 ------------------
aplay -vv foo.wav --device="plughw:CARD=Audio,DEV=0"
Its setup is: stream : PLAYBACK access : MMAP_INTERLEAVED format : S32_LE subformat : STD channels : 4 rate : 48000 exact rate : 48000 (48000/1) msbits : 32 buffer_size : 24000 period_size : 6000 period_time : 125000 tstamp_mode : NONE period_step : 1 avail_min : 6000 period_event : 0 start_threshold : 24000 stop_threshold : 24000 silence_threshold: 0 silence_size : 0 boundary : 1572864000 appl_ptr : 0 hw_ptr : 0 ############+ | 23%
------------------- #5 ------------------
tristan@ilya:~$ uname -a Linux ilya 3.17.0-031700-lowlatency #201410060605 SMP PREEMPT Mon Oct 6 11:06:16 UTC 2014 i686 i686 i686 GNU/Linux tristan@ilya:~$ cat /proc/asound/version Advanced Linux Sound Architecture Driver Version k3.17.0-031700-lowlatency.
Hi,
On 10/11/2014 07:32 PM, Tristan Chambers wrote:
I picked up an Echo Audio Echo 2 USB Interface. The product specs list iPad support through camera connection kit, so I assume it is class compliant. http://echoaudio.com/blogs/news/6454472-echo-digital-audio-introduces-the-ec...
However, on most systems when I plug the device in, it shows up in my sound settings panel under the Input tab, but not under the Output tab.
Recording works. I can successfully record with arecord -vv -fdat -D "plughw:CARD=Audio,DEV=0" echo.wav. I also can increase the sample rate by changing the flags. I verified that the sample rate actually increases by recording a 50khz test tone into the input and examining the wave form in an editor. It's there! So this is very promising. (anyone know of a test to verify bit depth? I want to make sure it's actually recording at 24bits.)
Playback however, is nothing but trouble. Like I said, the output device doesn't show up in the Output tab in my sound settings (gnome/pulse). However, when I list devices and available PCMs with aplay -l and aplay -L the device shows up on the lists. See specimens #1, #2, and #3. When I try to play though I get about a 1/4 second of audio and then nothing, and subsequent attempts to play sound output nothing. The device then must be unplugged and plugged back in. I'm playing with the command aplay -vv foo.wav --device="plughw:CARD=Audio,DEV=0". See output screen on specimen #4.
Any messages in dmesg when you try this? And does PulseAudio generate any logs that look suspicious? The output of 'lsusb -v' might also be helpful.
Daniel
Silly me, I tried it in a USB 2 port and now I'm getting much better results. I guess there are problems with this device on a USB 3 port in Linux - or maybe in general? There are still several problems though. Now I can get it to record and play with arecord and aplay, and I can run Jack and Ardour or Audacity with jack selected and do multitrack recording no problem! HOWEVER, the playback device still doesn't show up in my Gnome/Pulse manager. Also when I open Audacity (no jack) the device shows up on the list of ALSA devices but when I select the device for input or output the device emits several audible clicks, and when I try to record or play the program either crashes or goes very very slow and can only play or capture a fraction of a second worth of data.
Regarding your suggestions, I see very little reported in dmesg. I'm unaware of separate logs for PulseAudio. Anyone else have any ideas? It would be convenient, but not critical to get it working like any other sound device.
Anybody have any ideas for better debugging of the issue? I'd say the current state is livable but maybe not something I'd say 'works for anyone.'
------ dmesg -------
[ 137.058345] usb 3-1: new high-speed USB device number 2 using xhci_hcd [ 137.222869] usb 3-1: New USB device found, idVendor=040f, idProduct=0010 [ 137.222873] usb 3-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3 [ 137.222875] usb 3-1: Product: Echo 2 Audio [ 137.222877] usb 3-1: Manufacturer: ECHO Digital Audio [ 137.222878] usb 3-1: SerialNumber: 0000 [ 139.452978] usbcore: registered new interface driver snd-usb-audio [ 140.110495] retire_capture_urb: 3 callbacks suppressed
------ lsusb -v ------
tristan@ilya:/var/log$ lsusb -v
Bus 002 Device 004: ID 040f:0010 Echo Speech Corp. 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 0x040f Echo Speech Corp. idProduct 0x0010 bcdDevice 0.38 iManufacturer 1 iProduct 2 iSerial 3 bNumConfigurations 2 Configuration Descriptor: bLength 9 bDescriptorType 2 wTotalLength 311 bNumInterfaces 4 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 1 bInterfaceClass 1 Audio bInterfaceSubClass 1 Control Device bInterfaceProtocol 32 iInterface 2 AudioControl Interface Descriptor: bLength 9 bDescriptorType 36 bDescriptorSubtype 1 (HEADER) bcdADC 2.00 bCategory 8 wTotalLength 143 bmControl 0x00 AudioControl Interface Descriptor: bLength 8 bDescriptorType 36 bDescriptorSubtype 10 (CLOCK_SOURCE) bClockID 41 bmAttributes 0x03 Internal programmable Clock bmControls 0x07 Clock Frequency Control (read/write) Clock Validity Control (read-only) bAssocTerminal 0 iClockSource 9 AudioControl Interface Descriptor: bLength 8 bDescriptorType 36 bDescriptorSubtype 11 (CLOCK_SELECTOR) bUnitID 40 bNrInPins 1 baCSourceID( 0) 41 bmControls 0x03 Clock Selector Control (read/write) iClockSelector 8 AudioControl Interface Descriptor: bLength 17 bDescriptorType 36 bDescriptorSubtype 2 (INPUT_TERMINAL) bTerminalID 2 wTerminalType 0x0101 USB Streaming bAssocTerminal 0 bCSourceID 40 bNrChannels 4 bmChannelConfig 0x00000000 bmControls 0x0000 iChannelNames 15 iTerminal 6 AudioControl Interface Descriptor: bLength 26 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) bmaControls( 3) 0x0000000f Mute Control (read/write) Volume Control (read/write) bmaControls( 4) 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 1 wTerminalType 0x0201 Microphone bAssocTerminal 0 bCSourceID 40 bNrChannels 2 bmChannelConfig 0x00000000 bmControls 0x0000 iChannelNames 33 iTerminal 0 AudioControl Interface Descriptor: bLength 18 bDescriptorType 36 bDescriptorSubtype 6 (FEATURE_UNIT) bUnitID 11 bSourceID 1 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 22 wTerminalType 0x0101 USB Streaming bAssocTerminal 0 bSourceID 11 bCSourceID 40 bmControls 0x0000 iTerminal 7 Endpoint Descriptor: bLength 7 bDescriptorType 5 bEndpointAddress 0x84 EP 4 IN bmAttributes 3 Transfer Type Interrupt Synch Type None Usage Type Data wMaxPacketSize 0x0006 1x 6 bytes bInterval 8 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 2 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 4 bmChannelConfig 0x00000000 iChannelNames 15 AudioStreaming Interface Descriptor: bLength 6 bDescriptorType 36 bDescriptorSubtype 2 (FORMAT_TYPE) bFormatType 1 (FORMAT_TYPE_I) bSubslotSize 4 bBitResolution 24 Endpoint Descriptor: bLength 7 bDescriptorType 5 bEndpointAddress 0x01 EP 1 OUT bmAttributes 5 Transfer Type Isochronous Synch Type Asynchronous Usage Type Data wMaxPacketSize 0x0400 1x 1024 bytes bInterval 1 AudioControl Endpoint Descriptor: bLength 8 bDescriptorType 37 bDescriptorSubtype 1 (EP_GENERAL) bmAttributes 0x00 bmControls 0x00 bLockDelayUnits 2 Decoded PCM samples wLockDelay 8 Endpoint Descriptor: bLength 7 bDescriptorType 5 bEndpointAddress 0x81 EP 1 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 5 Interface Descriptor: bLength 9 bDescriptorType 4 bInterfaceNumber 2 bAlternateSetting 1 bNumEndpoints 1 bInterfaceClass 1 Audio bInterfaceSubClass 2 Streaming bInterfaceProtocol 32 iInterface 5 AudioStreaming Interface Descriptor: bLength 16 bDescriptorType 36 bDescriptorSubtype 1 (AS_GENERAL) bTerminalLink 22 bmControls 0x00 bFormatType 1 bmFormats 0x00000001 PCM bNrChannels 2 bmChannelConfig 0x00000000 iChannelNames 33 AudioStreaming Interface Descriptor: bLength 6 bDescriptorType 36 bDescriptorSubtype 2 (FORMAT_TYPE) bFormatType 1 (FORMAT_TYPE_I) bSubslotSize 4 bBitResolution 24 Endpoint Descriptor: bLength 7 bDescriptorType 5 bEndpointAddress 0x82 EP 2 IN bmAttributes 5 Transfer Type Isochronous Synch Type Asynchronous Usage Type Data wMaxPacketSize 0x0400 1x 1024 bytes bInterval 1 AudioControl Endpoint Descriptor: bLength 8 bDescriptorType 37 bDescriptorSubtype 1 (EP_GENERAL) bmAttributes 0x00 bmControls 0x00 bLockDelayUnits 2 Decoded PCM samples wLockDelay 8 Interface Descriptor: bLength 9 bDescriptorType 4 bInterfaceNumber 3 bAlternateSetting 0 bNumEndpoints 0 bInterfaceClass 254 Application Specific Interface bInterfaceSubClass 1 Device Firmware Update bInterfaceProtocol 1 iInterface 12 Device Firmware Upgrade Interface Descriptor: bLength 9 bDescriptorType 33 bmAttributes 7 Will Not Detach Manifestation Tolerant Upload Supported Download Supported wDetachTimeout 250 milliseconds wTransferSize 64 bytes bcdDFUVersion 1.10 Warning: Invalid descriptor Device Firmware Upgrade Interface Descriptor: bLength 16 bDescriptorType 36 bmAttributes 9 Will Detach Manifestation Intolerant Upload Unsupported Download Supported wDetachTimeout 226 milliseconds wTransferSize 256 bytes bcdDFUVersion 1.02 Configuration Descriptor: bLength 9 bDescriptorType 2 wTotalLength 311 bNumInterfaces 4 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 1 bInterfaceClass 1 Audio bInterfaceSubClass 1 Control Device bInterfaceProtocol 32 iInterface 2 AudioControl Interface Descriptor: bLength 9 bDescriptorType 36 bDescriptorSubtype 1 (HEADER) bcdADC 2.00 bCategory 8 wTotalLength 143 bmControl 0x00 AudioControl Interface Descriptor: bLength 8 bDescriptorType 36 bDescriptorSubtype 10 (CLOCK_SOURCE) bClockID 41 bmAttributes 0x03 Internal programmable Clock bmControls 0x07 Clock Frequency Control (read/write) Clock Validity Control (read-only) bAssocTerminal 0 iClockSource 9 AudioControl Interface Descriptor: bLength 8 bDescriptorType 36 bDescriptorSubtype 11 (CLOCK_SELECTOR) bUnitID 40 bNrInPins 1 baCSourceID( 0) 41 bmControls 0x03 Clock Selector Control (read/write) iClockSelector 8 AudioControl Interface Descriptor: bLength 17 bDescriptorType 36 bDescriptorSubtype 2 (INPUT_TERMINAL) bTerminalID 2 wTerminalType 0x0101 USB Streaming bAssocTerminal 0 bCSourceID 40 bNrChannels 4 bmChannelConfig 0x00000000 bmControls 0x0000 iChannelNames 15 iTerminal 6 AudioControl Interface Descriptor: bLength 26 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) bmaControls( 3) 0x0000000f Mute Control (read/write) Volume Control (read/write) bmaControls( 4) 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 1 wTerminalType 0x0201 Microphone bAssocTerminal 0 bCSourceID 40 bNrChannels 2 bmChannelConfig 0x00000000 bmControls 0x0000 iChannelNames 33 iTerminal 0 AudioControl Interface Descriptor: bLength 18 bDescriptorType 36 bDescriptorSubtype 6 (FEATURE_UNIT) bUnitID 11 bSourceID 1 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 22 wTerminalType 0x0101 USB Streaming bAssocTerminal 0 bSourceID 11 bCSourceID 40 bmControls 0x0000 iTerminal 7 Endpoint Descriptor: bLength 7 bDescriptorType 5 bEndpointAddress 0x84 EP 4 IN bmAttributes 3 Transfer Type Interrupt Synch Type None Usage Type Data wMaxPacketSize 0x0006 1x 6 bytes bInterval 8 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 2 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 4 bmChannelConfig 0x00000000 iChannelNames 15 AudioStreaming Interface Descriptor: bLength 6 bDescriptorType 36 bDescriptorSubtype 2 (FORMAT_TYPE) bFormatType 1 (FORMAT_TYPE_I) bSubslotSize 4 bBitResolution 24 Endpoint Descriptor: bLength 7 bDescriptorType 5 bEndpointAddress 0x01 EP 1 OUT bmAttributes 5 Transfer Type Isochronous Synch Type Asynchronous Usage Type Data wMaxPacketSize 0x0400 1x 1024 bytes bInterval 1 AudioControl Endpoint Descriptor: bLength 8 bDescriptorType 37 bDescriptorSubtype 1 (EP_GENERAL) bmAttributes 0x00 bmControls 0x00 bLockDelayUnits 2 Decoded PCM samples wLockDelay 8 Endpoint Descriptor: bLength 7 bDescriptorType 5 bEndpointAddress 0x81 EP 1 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 5 Interface Descriptor: bLength 9 bDescriptorType 4 bInterfaceNumber 2 bAlternateSetting 1 bNumEndpoints 1 bInterfaceClass 1 Audio bInterfaceSubClass 2 Streaming bInterfaceProtocol 32 iInterface 5 AudioStreaming Interface Descriptor: bLength 16 bDescriptorType 36 bDescriptorSubtype 1 (AS_GENERAL) bTerminalLink 22 bmControls 0x00 bFormatType 1 bmFormats 0x00000001 PCM bNrChannels 2 bmChannelConfig 0x00000000 iChannelNames 33 AudioStreaming Interface Descriptor: bLength 6 bDescriptorType 36 bDescriptorSubtype 2 (FORMAT_TYPE) bFormatType 1 (FORMAT_TYPE_I) bSubslotSize 4 bBitResolution 24 Endpoint Descriptor: bLength 7 bDescriptorType 5 bEndpointAddress 0x82 EP 2 IN bmAttributes 5 Transfer Type Isochronous Synch Type Asynchronous Usage Type Data wMaxPacketSize 0x0400 1x 1024 bytes bInterval 1 AudioControl Endpoint Descriptor: bLength 8 bDescriptorType 37 bDescriptorSubtype 1 (EP_GENERAL) bmAttributes 0x00 bmControls 0x00 bLockDelayUnits 2 Decoded PCM samples wLockDelay 8 Interface Descriptor: bLength 9 bDescriptorType 4 bInterfaceNumber 3 bAlternateSetting 0 bNumEndpoints 0 bInterfaceClass 254 Application Specific Interface bInterfaceSubClass 1 Device Firmware Update bInterfaceProtocol 1 iInterface 12 Device Firmware Upgrade Interface Descriptor: bLength 9 bDescriptorType 33 bmAttributes 7 Will Not Detach Manifestation Tolerant Upload Supported Download Supported wDetachTimeout 250 milliseconds wTransferSize 64 bytes bcdDFUVersion 1.10 Warning: Invalid descriptor Device Firmware Upgrade Interface Descriptor: bLength 16 bDescriptorType 36 bmAttributes 9 Will Detach Manifestation Intolerant Upload Unsupported Download Supported wDetachTimeout 226 milliseconds wTransferSize 256 bytes bcdDFUVersion 1.02
On Mon, Oct 13, 2014 at 10:45 AM, Daniel Mack daniel@zonque.org wrote:
Hi,
On 10/11/2014 07:32 PM, Tristan Chambers wrote:
I picked up an Echo Audio Echo 2 USB Interface. The product specs list iPad support through camera connection kit, so I assume it is class compliant. http://echoaudio.com/blogs/news/6454472-echo-digital-audio-introduces-the-ec...
However, on most systems when I plug the device in, it shows up in my sound settings panel under the Input tab, but not under the Output tab.
Recording works. I can successfully record with arecord -vv -fdat -D "plughw:CARD=Audio,DEV=0" echo.wav. I also can increase the sample rate by changing the flags. I verified that the sample rate actually increases by recording a 50khz test tone into the input and examining the wave form in an editor. It's there! So this is very promising. (anyone know of a test to verify bit depth? I want to make sure it's actually recording at 24bits.)
Playback however, is nothing but trouble. Like I said, the output device doesn't show up in the Output tab in my sound settings (gnome/pulse). However, when I list devices and available PCMs with aplay -l and aplay -L the device shows up on the lists. See specimens #1, #2, and #3. When I try to play though I get about a 1/4 second of audio and then nothing, and subsequent attempts to play sound output nothing. The device then must be unplugged and plugged back in. I'm playing with the command aplay -vv foo.wav --device="plughw:CARD=Audio,DEV=0". See output screen on specimen #4.
Any messages in dmesg when you try this? And does PulseAudio generate any logs that look suspicious? The output of 'lsusb -v' might also be helpful.
Daniel
participants (2)
-
Daniel Mack -
Tristan Chambers