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#1 2022-08-21 07:21:14
- ZAbzf
- Member
- Registered: 2022-08-21
- Posts: 4
Do I understand pulseaudio's alternate-sample-rate correctly?
Hey Guys,
Could you please help me nagivating pulseaudio config?
/etc/pulse/daemon.conf
daemonize = yes
avoid-resampling = yes
resample-method = soxr-vhq
flat-volumes = no
default-sample-format = float32le
default-sample-rate = 44100
alternate-sample-rate = 96000Steps to reproduce my issue below.
First of all when I run "pacmd list-sinks" without music playing I get following response:
2 sink(s) available.
index: 0
name: <alsa_output.hw_0_0>
driver: <module-alsa-sink.c>
flags: HARDWARE DECIBEL_VOLUME LATENCY DYNAMIC_LATENCY
state: IDLE
suspend cause: (none)
priority: 9000
volume: front-left: 65536 / 100% / 0.00 dB, front-right: 65536 / 100% / 0.00 dB
balance 0.00
base volume: 65536 / 100% / 0.00 dB
volume steps: 65537
muted: yes
current latency: 33.79 ms
max request: 13 KiB
max rewind: 13 KiB
monitor source: 1
sample spec: float32le 2ch 44100Hz
channel map: front-left,front-right
Stereo
used by: 0
linked by: 1
configured latency: 40.00 ms; range is 0.50 .. 2000.00 ms
module: 6
properties:
alsa.resolution_bits = "32"
device.api = "alsa"
device.class = "sound"
alsa.class = "generic"
alsa.subclass = "generic-mix"
alsa.name = "Loopback PCM"
alsa.id = "Loopback PCM"
alsa.subdevice = "0"
alsa.subdevice_name = "subdevice #0"
alsa.device = "0"
alsa.card = "0"
alsa.card_name = "Loopback"
alsa.long_card_name = "Loopback 1"
alsa.driver_name = "snd_aloop"
device.bus_path = "platform-snd_aloop.0"
sysfs.path = "/devices/platform/snd_aloop.0/sound/card0"
device.form_factor = "internal"
device.string = "hw:0,0"
device.buffering.buffer_size = "705600"
device.buffering.fragment_size = "705600"
device.access_mode = "mmap+timer"
device.description = "Built-in Audio"
device.icon_name = "audio-card"
* index: 2
name: <alsa_output.usb-Topping_DX3_Pro-00.analog-stereo>
driver: <module-alsa-card.c>
flags: HARDWARE DECIBEL_VOLUME LATENCY DYNAMIC_LATENCY
state: IDLE
suspend cause: (none)
priority: 9049
volume: front-left: 65536 / 100% / 0.00 dB, front-right: 65536 / 100% / 0.00 dB
balance 0.00
base volume: 65536 / 100% / 0.00 dB
volume steps: 65537
muted: no
current latency: 48.89 ms
max request: 13 KiB
max rewind: 13 KiB
monitor source: 3
sample spec: s32le 2ch 44100Hz
channel map: front-left,front-right
Stereo
used by: 0
linked by: 1
configured latency: 40.00 ms; range is 0.50 .. 2000.00 ms
card: 1 <alsa_card.usb-Topping_DX3_Pro-00>
module: 9
properties:
alsa.resolution_bits = "32"
device.api = "alsa"
device.class = "sound"
alsa.class = "generic"
alsa.subclass = "generic-mix"
alsa.name = "USB Audio"
alsa.id = "USB Audio"
alsa.subdevice = "0"
alsa.subdevice_name = "subdevice #0"
alsa.device = "0"
alsa.card = "3"
alsa.card_name = "DX3 Pro"
alsa.long_card_name = "Topping DX3 Pro at usb-0000:0c:00.3-4, high speed"
alsa.driver_name = "snd_usb_audio"
device.bus_path = "pci-0000:0c:00.3-usb-0:4:1.0"
sysfs.path = "/devices/pci0000:00/0000:00:08.1/0000:0c:00.3/usb7/7-4/7-4:1.0/sound/card3"
udev.id = "usb-Topping_DX3_Pro-00"
device.bus = "usb"
device.vendor.id = "152a"
device.vendor.name = "Thesycon Systemsoftware & Consulting GmbH"
device.product.id = "8750"
device.product.name = "DX3 Pro"
device.serial = "Topping_DX3_Pro"
device.string = "front:3"
device.buffering.buffer_size = "705600"
device.buffering.fragment_size = "352800"
device.access_mode = "mmap+timer"
device.profile.name = "analog-stereo"
device.profile.description = "Analog Stereo"
device.description = "DX3 Pro Analog Stereo"
module-udev-detect.discovered = "1"
device.icon_name = "audio-card-usb"
ports:
analog-output: Analog Output (priority 9900, latency offset 0 usec, available: unknown)
properties:
active port: <analog-output>Sample spec is aligning with default-sample-rate from daemon.conf
sample spec: s32le 2ch 44100Hz Let me play some music from spotify:
pacmd list-sink-inputs
1 sink input(s) available.
index: 0
driver: <protocol-native.c>
flags: START_CORKED
state: RUNNING
sink: 2 <alsa_output.usb-Topping_DX3_Pro-00.analog-stereo>
volume: front-left: 65535 / 100% / -0.00 dB, front-right: 65535 / 100% / -0.00 dB
balance 0.00
muted: no
current latency: 1012.90 ms
requested latency: 980.00 ms
sample spec: float32le 2ch 44100Hz
channel map: front-left,front-right
Stereo
resample method: copy
module: 15
client: 12 <Spotify>As intended: No resampling
resample method: copyOk now let's listen to some grand audiophile placebo flacs.
Since (according to many sources) Pulseaudio doesn't change the sampling rate of sink on the fly. I pause all audio in my PC, make sure that state of the sink changes to SUSPENDED and then turn on the FLAC file through deadbeef:
pacmd list-sink-inputs
1 sink input(s) available.
index: 2
driver: <protocol-native.c>
flags:
state: RUNNING
sink: 2 <alsa_output.usb-Topping_DX3_Pro-00.analog-stereo>
volume: front-left: 65536 / 100% / 0.00 dB, front-right: 65536 / 100% / 0.00 dB
balance 0.00
muted: no
current latency: 136.96 ms
requested latency: 105.00 ms
sample spec: s24le 2ch 96000Hz
channel map: front-left,front-right
Stereo
resample method: soxr-vhq
module: 15
client: 37 <Deadbeef>Sounds about right:
sample spec: s24le 2ch 96000HzWhy tho?
resample method: soxr-vhqShouldn't pulseaudio detect alternate-sample-rate and rush 96000Hz raw audio?
pacmd list-sinks didn't change the sample spec and continues detecting it as:
sample spec: s32le 2ch 44100HzMy Dac shows 441000Hz as well.
Is there a way to fix this? Any help will be appreciated!
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#2 2022-08-22 15:07:27
- V1del
- Forum Moderator
- Registered: 2012-10-16
- Posts: 25,263
Re: Do I understand pulseaudio's alternate-sample-rate correctly?
Does your DAC actually support/expose the sample rate of 96000 to the OS? What's your output for
sudo lsusb -vd152a:8750 #usbutilsOffline
#3 2022-08-24 06:39:48
- ZAbzf
- Member
- Registered: 2022-08-21
- Posts: 4
Re: Do I understand pulseaudio's alternate-sample-rate correctly?
V1del wrote:
Does your DAC actually support/expose the sample rate of 96000 to the OS? What's your output for
sudo lsusb -vd152a:8750 #usbutils
It definitely does. I can change default-sample-rate to 96k and it works!
output below
Bus 007 Device 003: ID 152a:8750 Thesycon Systemsoftware & Consulting GmbH DX3 Pro
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 2.00
bDeviceClass 239 Miscellaneous Device
bDeviceSubClass 2
bDeviceProtocol 1 Interface Association
bMaxPacketSize0 64
idVendor 0x152a Thesycon Systemsoftware & Consulting GmbH
idProduct 0x8750
bcdDevice 1.04
iManufacturer 1 Topping
iProduct 3 DX3 Pro
iSerial 0
bNumConfigurations 2
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 0x011c
bNumInterfaces 3
bConfigurationValue 1
iConfiguration 0
bmAttributes 0xc0
Self Powered
MaxPower 0mA
Interface Association:
bLength 8
bDescriptorType 11
bFirstInterface 0
bInterfaceCount 2
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 3 DX3 Pro
AudioControl Interface Descriptor:
bLength 9
bDescriptorType 36
bDescriptorSubtype 1 (HEADER)
bcdADC 2.00
bCategory 8
wTotalLength 0x0048
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 9 Topping Internal Clock
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 8 Topping Clock Selector
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 11 Analogue 1
bmControls 0x0000
iTerminal 6 DX3 Pro
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) 0x00000000
bmaControls(2) 0x00000000
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
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 1
bAlternateSetting 0
bNumEndpoints 0
bInterfaceClass 1 Audio
bInterfaceSubClass 2 Streaming
bInterfaceProtocol 32
iInterface 4 DX3 Pro
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 1
bAlternateSetting 1
bNumEndpoints 2
bInterfaceClass 1 Audio
bInterfaceSubClass 2 Streaming
bInterfaceProtocol 32
iInterface 4 DX3 Pro
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 11 Analogue 1
AudioStreaming Interface Descriptor:
bLength 6
bDescriptorType 36
bDescriptorSubtype 2 (FORMAT_TYPE)
bFormatType 1 (FORMAT_TYPE_I)
bSubslotSize 4
bBitResolution 32
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x01 EP 1 OUT
bmAttributes 5
Transfer Type Isochronous
Synch Type Asynchronous
Usage Type Data
wMaxPacketSize 0x0308 1x 776 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
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 1
bAlternateSetting 2
bNumEndpoints 2
bInterfaceClass 1 Audio
bInterfaceSubClass 2 Streaming
bInterfaceProtocol 32
iInterface 4 DX3 Pro
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 11 Analogue 1
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 0x0308 1x 776 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
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 1
bAlternateSetting 3
bNumEndpoints 2
bInterfaceClass 1 Audio
bInterfaceSubClass 2 Streaming
bInterfaceProtocol 32
iInterface 4 DX3 Pro
AudioStreaming Interface Descriptor:
bLength 16
bDescriptorType 36
bDescriptorSubtype 1 (AS_GENERAL)
bTerminalLink 2
bmControls 0x00
bFormatType 1
bmFormats 0x80000000
bNrChannels 2
bmChannelConfig 0x00000000
iChannelNames 11 Analogue 1
AudioStreaming Interface Descriptor:
bLength 6
bDescriptorType 36
bDescriptorSubtype 2 (FORMAT_TYPE)
bFormatType 1 (FORMAT_TYPE_I)
bSubslotSize 4
bBitResolution 32
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x01 EP 1 OUT
bmAttributes 5
Transfer Type Isochronous
Synch Type Asynchronous
Usage Type Data
wMaxPacketSize 0x0308 1x 776 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
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 254 Application Specific Interface
bInterfaceSubClass 1 Device Firmware Update
bInterfaceProtocol 1
iInterface 10 Topping DFU
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
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 0x011c
bNumInterfaces 3
bConfigurationValue 1
iConfiguration 0
bmAttributes 0xc0
Self Powered
MaxPower 0mA
Interface Association:
bLength 8
bDescriptorType 11
bFirstInterface 0
bInterfaceCount 2
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 3 DX3 Pro
AudioControl Interface Descriptor:
bLength 9
bDescriptorType 36
bDescriptorSubtype 1 (HEADER)
bcdADC 2.00
bCategory 8
wTotalLength 0x0048
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 9 Topping Internal Clock
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 8 Topping Clock Selector
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 11 Analogue 1
bmControls 0x0000
iTerminal 6 DX3 Pro
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) 0x00000000
bmaControls(2) 0x00000000
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
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 1
bAlternateSetting 0
bNumEndpoints 0
bInterfaceClass 1 Audio
bInterfaceSubClass 2 Streaming
bInterfaceProtocol 32
iInterface 4 DX3 Pro
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 1
bAlternateSetting 1
bNumEndpoints 2
bInterfaceClass 1 Audio
bInterfaceSubClass 2 Streaming
bInterfaceProtocol 32
iInterface 4 DX3 Pro
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 11 Analogue 1
AudioStreaming Interface Descriptor:
bLength 6
bDescriptorType 36
bDescriptorSubtype 2 (FORMAT_TYPE)
bFormatType 1 (FORMAT_TYPE_I)
bSubslotSize 4
bBitResolution 32
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x01 EP 1 OUT
bmAttributes 5
Transfer Type Isochronous
Synch Type Asynchronous
Usage Type Data
wMaxPacketSize 0x0308 1x 776 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
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 1
bAlternateSetting 2
bNumEndpoints 2
bInterfaceClass 1 Audio
bInterfaceSubClass 2 Streaming
bInterfaceProtocol 32
iInterface 4 DX3 Pro
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 11 Analogue 1
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 0x0308 1x 776 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
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 1
bAlternateSetting 3
bNumEndpoints 2
bInterfaceClass 1 Audio
bInterfaceSubClass 2 Streaming
bInterfaceProtocol 32
iInterface 4 DX3 Pro
AudioStreaming Interface Descriptor:
bLength 16
bDescriptorType 36
bDescriptorSubtype 1 (AS_GENERAL)
bTerminalLink 2
bmControls 0x00
bFormatType 1
bmFormats 0x80000000
bNrChannels 2
bmChannelConfig 0x00000000
iChannelNames 11 Analogue 1
AudioStreaming Interface Descriptor:
bLength 6
bDescriptorType 36
bDescriptorSubtype 2 (FORMAT_TYPE)
bFormatType 1 (FORMAT_TYPE_I)
bSubslotSize 4
bBitResolution 32
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x01 EP 1 OUT
bmAttributes 5
Transfer Type Isochronous
Synch Type Asynchronous
Usage Type Data
wMaxPacketSize 0x0308 1x 776 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
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 254 Application Specific Interface
bInterfaceSubClass 1 Device Firmware Update
bInterfaceProtocol 1
iInterface 10 Topping DFU
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
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 2
Device Status: 0x0001
Self PoweredLast edited by ZAbzf (2022-08-24 06:43:36)
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#4 2022-08-24 07:32:48
- V1del
- Forum Moderator
- Registered: 2012-10-16
- Posts: 25,263
Re: Do I understand pulseaudio's alternate-sample-rate correctly?
Mhm mhm, more generally you can configure pulse to be more aggressive in avoiding resampling by configuring the avoid-resampling = true option in your /etc/pulse/daemon.conf did you do that?
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#5 2022-08-24 09:01:03
- ZAbzf
- Member
- Registered: 2022-08-21
- Posts: 4
Re: Do I understand pulseaudio's alternate-sample-rate correctly?
V1del wrote:
Mhm mhm, more generally you can configure pulse to be more aggressive in avoiding resampling by configuring the avoid-resampling = true option in your /etc/pulse/daemon.conf did you do that?
I already had it on (first code block in my original post).
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#6 2022-08-24 09:07:39
- V1del
- Forum Moderator
- Registered: 2012-10-16
- Posts: 25,263
Re: Do I understand pulseaudio's alternate-sample-rate correctly?
Whoops sorry, looks as expected then, somewhat stumped why it wouldn't do it.
Looking at some bug reports, this seems interesting: https://gitlab.freedesktop.org/pulseaud … ssues/1152 and this might be up to the kernel changes for implicit_fb, maybe try loading snd-usb-audio with implicit_fb=1 e.g. /etc/modprobe.d/disableImplicitFB.conf
options snd-usb-audio implicit_fb=1and reboot/reload snd-usb-audio
Last edited by V1del (2022-08-24 09:16:38)
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#7 2022-08-24 10:33:52
- ZAbzf
- Member
- Registered: 2022-08-21
- Posts: 4
Re: Do I understand pulseaudio's alternate-sample-rate correctly?
V1del wrote:
Whoops sorry, looks as expected then, somewhat stumped why it wouldn't do it.
Looking at some bug reports, this seems interesting: https://gitlab.freedesktop.org/pulseaud … ssues/1152 and this might be up to the kernel changes for implicit_fb, maybe try loading snd-usb-audio with implicit_fb=1 e.g. /etc/modprobe.d/disableImplicitFB.conf
options snd-usb-audio implicit_fb=1and reboot/reload snd-usb-audio
Thanks for digging into this! Really appreciate.
I created a disableImplicitFB.conf file with contents of the code block. Restarted.
No change in the behaviour. Pulse audio still resamples the 96k flacs.
Edit:
Couldn't figure it out. I tried to set up deadbeef in a way that it uses alsa as an output (bypassing pulseaudio) but it kept capping sample rate at 48000. Might be something connected to dmix being on by default. Anyway. Moved to pipewire. It behaves as intended without any issues. Not looking back!
Last edited by ZAbzf (2022-08-29 00:32:07)
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