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https://github.com/reimunotmoe/fiio-btr3-usb-linux-workaround
Workaround to get FiiO BTR3's USB mode work in Linux
https://github.com/reimunotmoe/fiio-btr3-usb-linux-workaround
Last synced: 18 days ago
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Workaround to get FiiO BTR3's USB mode work in Linux
- Host: GitHub
- URL: https://github.com/reimunotmoe/fiio-btr3-usb-linux-workaround
- Owner: ReimuNotMoe
- Created: 2019-02-12T13:38:04.000Z (almost 6 years ago)
- Default Branch: master
- Last Pushed: 2019-02-12T13:50:54.000Z (almost 6 years ago)
- Last Synced: 2023-02-28T21:48:45.659Z (over 1 year ago)
- Size: 5.86 KB
- Stars: 50
- Watchers: 2
- Forks: 5
- Open Issues: 2
-
Metadata Files:
- Readme: README.md
Awesome Lists containing this project
README
# FiiO BTR3 USB Linux Workaround
Workaround to get FiiO BTR3's USB mode work in Linux
As of Linux 4.20.5, this device won't work on 44100 sample rate, only 48000 works.
### Pulseaudio howto
For most users, just append these lines to `/etc/pulse/daemon.conf`:
```
default-sample-rate = 192000
alternate-sample-rate = 48000
```
Explaination:
Nowdays most built-in sound cards support 192kHz sample rate, so we set `default-sample-rate` to `192000`.
When any of our sound devices doesn't support 192kHz, we want it to fallback to 48kHz (supported since AC97). So we set `alternate-sample-rate` to `48000`.
In this way, pulseaudio will only use either 192kHz or 48kHz. This solves the problem.
### ALSA howto
Configure your software to use 48000 sample rate.
### Appendix
`# cat /proc/asound/BTR3/stream0`
```
FiiO BTR3 at usb-0000:00:14.0-9, full speed : USB Audio
Playback:
Status: Running
Interface = 1
Altset = 1
Packet Size = 192
Momentary freq = 48000 Hz (0x30.0000)
Interface 1
Altset 1
Format: S16_LE
Channels: 2
Endpoint: 3 OUT (NONE)
Rates: 48000, 44100
```
`# lsusb -d 0a12:1243 -v`
```
Bus 001 Device 031: ID 0a12:1243 Cambridge Silicon Radio, Ltd
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 2.00
bDeviceClass 0 (Defined at Interface level)
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 64
idVendor 0x0a12 Cambridge Silicon Radio, Ltd
idProduct 0x1243
bcdDevice 25.20
iManufacturer 0
iProduct 2 FiiO BTR3
iSerial 3 ABCDEF0123456789
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 141
bNumInterfaces 3
bConfigurationValue 1
iConfiguration 0
bmAttributes 0x80
(Bus Powered)
MaxPower 500mA
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 0
bInterfaceClass 1 Audio
bInterfaceSubClass 1 Control Device
bInterfaceProtocol 0
iInterface 0
AudioControl Interface Descriptor:
bLength 9
bDescriptorType 36
bDescriptorSubtype 1 (HEADER)
bcdADC 1.00
wTotalLength 43
bInCollection 1
baInterfaceNr( 0) 1
AudioControl Interface Descriptor:
bLength 12
bDescriptorType 36
bDescriptorSubtype 2 (INPUT_TERMINAL)
bTerminalID 1
wTerminalType 0x0101 USB Streaming
bAssocTerminal 0
bNrChannels 2
wChannelConfig 0x0003
Left Front (L)
Right Front (R)
iChannelNames 0
iTerminal 0
AudioControl Interface Descriptor:
bLength 13
bDescriptorType 36
bDescriptorSubtype 6 (FEATURE_UNIT)
bUnitID 2
bSourceID 1
bControlSize 2
bmaControls( 0) 0x01
bmaControls( 0) 0x00
Mute Control
bmaControls( 1) 0x02
bmaControls( 1) 0x00
Volume Control
bmaControls( 2) 0x02
bmaControls( 2) 0x00
Volume Control
iFeature 0
AudioControl Interface Descriptor:
bLength 9
bDescriptorType 36
bDescriptorSubtype 3 (OUTPUT_TERMINAL)
bTerminalID 3
wTerminalType 0x0301 Speaker
bAssocTerminal 0
bSourceID 2
iTerminal 0
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 1
bAlternateSetting 0
bNumEndpoints 0
bInterfaceClass 1 Audio
bInterfaceSubClass 2 Streaming
bInterfaceProtocol 0
iInterface 0
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 1
bAlternateSetting 1
bNumEndpoints 1
bInterfaceClass 1 Audio
bInterfaceSubClass 2 Streaming
bInterfaceProtocol 0
iInterface 0
AudioStreaming Interface Descriptor:
bLength 7
bDescriptorType 36
bDescriptorSubtype 1 (AS_GENERAL)
bTerminalLink 1
bDelay 0 frames
wFormatTag 1 PCM
AudioStreaming Interface Descriptor:
bLength 14
bDescriptorType 36
bDescriptorSubtype 2 (FORMAT_TYPE)
bFormatType 1 (FORMAT_TYPE_I)
bNrChannels 2
bSubframeSize 2
bBitResolution 16
bSamFreqType 2 Discrete
tSamFreq[ 0] 48000
tSamFreq[ 1] 44100
AudioControl Endpoint Descriptor:
bLength 7
bDescriptorType 37
bDescriptorSubtype 1 (EP_GENERAL)
bmAttributes 0x81
Sampling Frequency
MaxPacketsOnly
bLockDelayUnits 2 Decoded PCM samples
wLockDelay 0 Decoded PCM samples
Endpoint Descriptor:
bLength 9
bDescriptorType 5
bEndpointAddress 0x03 EP 3 OUT
bmAttributes 1
Transfer Type Isochronous
Synch Type None
Usage Type Data
wMaxPacketSize 0x00c0 1x 192 bytes
bInterval 1
bRefresh 0
bSynchAddress 0
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 2
bAlternateSetting 0
bNumEndpoints 1
bInterfaceClass 3 Human Interface Device
bInterfaceSubClass 0 No Subclass
bInterfaceProtocol 0 None
iInterface 0
HID Device Descriptor:
bLength 9
bDescriptorType 33
bcdHID 1.11
bCountryCode 0 Not supported
bNumDescriptors 1
bDescriptorType 34 Report
wDescriptorLength 69
Report Descriptors:
** UNAVAILABLE **
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x0010 1x 16 bytes
bInterval 1
Device Status: 0x0000
(Bus Powered)
```