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#1 2021-04-25 13:28:15

radiobla
Member
Registered: 2020-02-19
Posts: 65

Pulseaudio sample rate changes

I'm using an external USB audio interface (M-Audio M-Track Plus) on latest Arch.

Whenever I click on KDE Plasma sound icon on system tray, the audio sample rate changes from the default 44100Hz (I set on daemon.conf) to 48000Hz. I don't need to do anything else, just clicking the icon makes pulseaudio to change it. Thus, the pitch of the audio I'm listening gets lower instantly.

This issue also happens when running some games on Steam (probably the ones which uses Proton/Wine).

$ pacman -Qi pulseaudio
Name            : pulseaudio
Version         : 14.2-3

I tried to set Pulseaudio default sample rate to 44100 on /etc/pulse/daemon.conf, but it seems to have no effect.

$ grep sample-rate /etc/pulse/daemon.conf 
default-sample-rate = 44100
; alternate-sample-rate = 48000

As you can see below, Pulseaudio keeps using 48000Hz and, even if I force it to 44100, it keeps changing when running some applications (as the example I gave of Steam and KDE sound system tray icon).

$ pacmd list-sinks | grep sample
        sample spec: s32le 2ch 48000Hz
$ cat /proc/asound/cards 
...
 1 [Plus           ]: USB-Audio - M-Track Plus
                      M-Audio M-Track Plus at usb-0000:00:14.0-2, high speed
...

As you can see, ALSA is working with 48000Hz.

$ cat /proc/asound/card1/pcm0p/sub0/hw_params 
access: MMAP_INTERLEAVED
format: S32_LE
subformat: STD
channels: 2
rate: 48000 (48000/1)
period_size: 44100
buffer_size: 88200

If I could just set the sample rate to be fixed on some frequency, it would be great.

So far, there's nothing I do that fixes the issue.

Does anyone have any clues?

Thanks

Last edited by radiobla (2021-04-25 13:31:09)

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#2 2021-04-25 13:39:13

V1del
Forum Moderator
Registered: 2012-10-16
Posts: 12,698

Re: Pulseaudio sample rate changes

If you set both the alternate and the default-sample-rate to the same value, do you still have issues? FWIW if the alsa HW params give you this output then you probably want to do the reverse and fixate on 48000 since that's what the interface supports.

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#3 2021-04-25 18:49:28

radiobla
Member
Registered: 2020-02-19
Posts: 65

Re: Pulseaudio sample rate changes

Thank you, V1d3l.

Setting both default and alternate sample rates serves as a workaround (but works). I'm pretty sure that my interface supports 44100Hz. I was trying to use 44.1kHz in order to define a standard to work with pro-audio.

BTW, neither Plasma sound system tray function or Steam games should have this strange behavior.

When the problem happens, the only solution is to restart Pulseaudio service.

Thanks

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#4 2021-04-25 21:22:37

V1del
Forum Moderator
Registered: 2012-10-16
Posts: 12,698

Re: Pulseaudio sample rate changes

This can happen if you have an interface that claims to be able to do something but runs into issues when actually doing that something. There are many buggy cards that claim support for both and then fail when actually trying to do that. What's the output of

sudo lsusb -vd$VID:$PID

with the relevant vid and pids replaced for the device?

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#5 2021-04-25 22:06:11

radiobla
Member
Registered: 2020-02-19
Posts: 65

Re: Pulseaudio sample rate changes

I got a huge output. Here it goes:

Bus 001 Device 003: ID 0763:4009 M-Audio M-Track Plus
Device Descriptor:
  bLength                18
  bDescriptorType         1
  bcdUSB               2.00
  bDeviceClass          239 Miscellaneous Device
  bDeviceSubClass         2 
  bDeviceProtocol         1 Interface Association
  bMaxPacketSize0        64
  idVendor           0x0763 M-Audio
  idProduct          0x4009 
  bcdDevice            1.00
  iManufacturer           1 M-Audio 
  iProduct                3 M-Track Plus
  iSerial                 0 
  bNumConfigurations      2
  Configuration Descriptor:
    bLength                 9
    bDescriptorType         2
    wTotalLength       0x0118
    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           0
      bInterfaceClass         1 Audio
      bInterfaceSubClass      1 Control Device
      bInterfaceProtocol     32 
      iInterface              3 M-Track Plus
      AudioControl Interface Descriptor:
        bLength                 9
        bDescriptorType        36
        bDescriptorSubtype      1 (HEADER)
        bcdADC               2.00
        bCategory               8
        wTotalLength       0x0077
        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 M-Audio 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 M-Audio 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          13 M-Track Plus 1
        bmControls         0x0000
        iTerminal               6 M-Audio M-Track Plus
      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             1
        wTerminalType      0x0201 Microphone
        bAssocTerminal          0
        bCSourceID             40
        bNrChannels             2
        bmChannelConfig    0x00000000
        iChannelNames          13 M-Track Plus 1
        bmControls         0x0000
        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 M-Audio M-Track Plus
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        1
      bAlternateSetting       0
      bNumEndpoints           0
      bInterfaceClass         1 Audio
      bInterfaceSubClass      2 Streaming
      bInterfaceProtocol     32 
      iInterface              4 M-Audio M-Track Plus
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        1
      bAlternateSetting       1
      bNumEndpoints           2
      bInterfaceClass         1 Audio
      bInterfaceSubClass      2 Streaming
      bInterfaceProtocol     32 
      iInterface              4 M-Audio M-Track Plus
      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 M-Track Plus 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     0x0400  1x 1024 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         1 Audio
      bInterfaceSubClass      2 Streaming
      bInterfaceProtocol     32 
      iInterface              5 M-Audio M-Track Plus
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        2
      bAlternateSetting       1
      bNumEndpoints           1
      bInterfaceClass         1 Audio
      bInterfaceSubClass      2 Streaming
      bInterfaceProtocol     32 
      iInterface              5 M-Audio M-Track Plus
      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          13 M-Track Plus 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     0x82  EP 2 IN
        bmAttributes            5
          Transfer Type            Isochronous
          Synch Type               Asynchronous
          Usage Type               Data
        wMaxPacketSize     0x0400  1x 1024 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        3
      bAlternateSetting       0
      bNumEndpoints           0
      bInterfaceClass       254 Application Specific Interface
      bInterfaceSubClass      1 Device Firmware Update
      bInterfaceProtocol      1 
      iInterface             10 M-Audio 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       0x0118
    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           0
      bInterfaceClass         1 Audio
      bInterfaceSubClass      1 Control Device
      bInterfaceProtocol     32 
      iInterface              3 M-Track Plus
      AudioControl Interface Descriptor:
        bLength                 9
        bDescriptorType        36
        bDescriptorSubtype      1 (HEADER)
        bcdADC               2.00
        bCategory               8
        wTotalLength       0x0077
        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 M-Audio 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 M-Audio 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          13 M-Track Plus 1
        bmControls         0x0000
        iTerminal               6 M-Audio M-Track Plus
      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             1
        wTerminalType      0x0201 Microphone
        bAssocTerminal          0
        bCSourceID             40
        bNrChannels             2
        bmChannelConfig    0x00000000
        iChannelNames          13 M-Track Plus 1
        bmControls         0x0000
        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 M-Audio M-Track Plus
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        1
      bAlternateSetting       0
      bNumEndpoints           0
      bInterfaceClass         1 Audio
      bInterfaceSubClass      2 Streaming
      bInterfaceProtocol     32 
      iInterface              4 M-Audio M-Track Plus
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        1
      bAlternateSetting       1
      bNumEndpoints           2
      bInterfaceClass         1 Audio
      bInterfaceSubClass      2 Streaming
      bInterfaceProtocol     32 
      iInterface              4 M-Audio M-Track Plus
      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 M-Track Plus 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     0x0400  1x 1024 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         1 Audio
      bInterfaceSubClass      2 Streaming
      bInterfaceProtocol     32 
      iInterface              5 M-Audio M-Track Plus
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        2
      bAlternateSetting       1
      bNumEndpoints           1
      bInterfaceClass         1 Audio
      bInterfaceSubClass      2 Streaming
      bInterfaceProtocol     32 
      iInterface              5 M-Audio M-Track Plus
      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          13 M-Track Plus 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     0x82  EP 2 IN
        bmAttributes            5
          Transfer Type            Isochronous
          Synch Type               Asynchronous
          Usage Type               Data
        wMaxPacketSize     0x0400  1x 1024 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        3
      bAlternateSetting       0
      bNumEndpoints           0
      bInterfaceClass       254 Application Specific Interface
      bInterfaceSubClass      1 Device Firmware Update
      bInterfaceProtocol      1 
      iInterface             10 M-Audio 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            0 
  bDeviceSubClass         0 
  bDeviceProtocol         0 
  bMaxPacketSize0        64
  bNumConfigurations      1
can't get debug descriptor: Resource temporarily unavailable
Device Status:     0x0000
  (Bus Powered)

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#6 2021-04-26 13:19:23

Flemur
Member
Registered: 2012-05-24
Posts: 47

Re: Pulseaudio sample rate changes

radiobla wrote:

Thank you, V1d3l.
Setting both default and alternate sample rates serves as a workaround (but works). I'm pretty sure that my interface supports 44100Hz. I was trying to use 44.1kHz in order to define a standard to work with pro-audio.

I've been doing the same thing, setting default and alternate sample rates to 44100, then if I check the card with (and some audio running)

cat /proc/asound/card0/pcm0p/sub0/hw_params

it returns those values  (rate: 44100, format: S16_LE)

I use this to check the card's abilities (to ensure that 44100 was available):
grep rates /proc/asound/card0/codec\#0

    rates [0x560]: 44100 48000 96000 192000
    rates [0x60]: 44100 48000
    rates [0x60]: 44100 48000
    rates [0x5e0]: 44100 48000 88200 96000 192000
    rates [0x560]: 44100 48000 96000 192000
    rates [0x560]: 44100 48000 96000 192000

I dunno what the difference between, e.g. 'rates [0x560]' and 'rates [0x5e0]'...but they all show 44100.


"If you do not change direction, you may end up where you are heading." -- L.T.

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#7 2021-04-26 18:37:01

radiobla
Member
Registered: 2020-02-19
Posts: 65

Re: Pulseaudio sample rate changes

Flemur,

Do you have this same audio interface? (M-Audio M-Track Plus)

I don't have this codec#0 file on my /proc/asound. Strange.

Last edited by radiobla (2021-04-26 18:40:54)

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#8 2021-04-26 18:38:13

radiobla
Member
Registered: 2020-02-19
Posts: 65

Re: Pulseaudio sample rate changes

I don't know either, but it could to be related with Input or Ouput sample rate, or maybe to the Analog or Digital I/O.

Last edited by radiobla (2021-04-26 18:41:27)

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#9 2021-04-26 19:51:33

Flemur
Member
Registered: 2012-05-24
Posts: 47

Re: Pulseaudio sample rate changes

radiobla wrote:

Flemur,
Do you have this same audio interface? (M-Audio M-Track Plus)

Nope, just an onboad Intel chip.  But I wouldn't mind having one of those gizmos!

I don't have this codec#0 file on my /proc/asound. Strange.

To see what's there, try something like

du -a /proc/asound

FWIW, I got involved in this stuff* when I noticed that the default pulseaudio settings made it resample my 44.1K files to 48K.

AND I noticed that even outputting directly to alsa, as the link below, alsa would resample 44.1 to 48 without using pulseaudio.
Edit: The above is INcorrect; I'm experimenting, and (outputting direct to) alsa doesn't resample 44.1 to 48k with one source playing, at least as shown by

cat /proc/asound/card0/pcm0p/sub0/hw_params

where it matches the input,  44.1 or 48.

*https://www.head-fi.org/threads/bit-per … ux.561961/

Last edited by Flemur (2021-04-26 20:07:43)


"If you do not change direction, you may end up where you are heading." -- L.T.

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#10 2021-04-27 17:13:36

radiobla
Member
Registered: 2020-02-19
Posts: 65

Re: Pulseaudio sample rate changes

Edit: The above is INcorrect; I'm experimenting, and (outputting direct to) alsa doesn't resample 44.1 to 48k with one source playing, at least as shown by

cat /proc/asound/card0/pcm0p/sub0/hw_params

where it matches the input,  44.1 or 48.

The resample usually happens with more than one sources playing. For example, I'm listening to music on web then I open a game on Steam so the issue (resampling) happens. It happens specially with games on Proton.

I use Jack2 for pro-audio also. If you have Jack running, the problem doesn't happen. At least, not with me.

I bet it's a bug on Pulseaudio.

Flemur, what is your current setup (Window/Desktop Manager, Web Browser, etc)? Do you use "pro-audio"?

As I've mentioned on previous posts, when I click on the "Sound" icon on Plasma system tray, the resampling happens instantly.

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