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Alsa warnings when I start PyAudio - how can I avoid them?

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Chris P

I have the following warnings while instantiating pyaudio.

chris@chris-Inspiron-3847:~/Documents/Projects/Papinhio player/setup/database_init$ python
Python 3.9.7 (default, Sep 10 2021, 14:59:43) 
[GCC 11.2.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import pyaudio
>>> p = pyaudio.PyAudio()
ALSA lib pcm_dmix.c:1075:(snd_pcm_dmix_open) unable to open slave
ALSA lib pcm_oss.c:377:(_snd_pcm_oss_open) Unknown field port
ALSA lib pcm_oss.c:377:(_snd_pcm_oss_open) Unknown field port
ALSA lib pcm_usb_stream.c:486:(_snd_pcm_usb_stream_open) Invalid type for card
ALSA lib pcm_usb_stream.c:486:(_snd_pcm_usb_stream_open) Invalid type for card
ALSA lib pcm_dmix.c:1075:(snd_pcm_dmix_open) unable to open slave
>>> exit()
chris@chris-Inspiron-3847:~/Documents/Projects/Papinhio player/setup/database_init$

file: /usr/share/alsa/alsa.conf

#
#  ALSA library configuration file
#

# pre-load the configuration files

@hooks [
    {
        func load
        files [
            "/usr/etc/alsa/conf.d"
            "/etc/alsa/conf.d"
            "/etc/asound.conf|||/usr/etc/asound.conf"
            "~/.asoundrc"
            {
                @func concat
                strings [
                    {
                        @func getenv
                        vars [
                            XDG_CONFIG_HOME
                        ]
                        default "~/.config"
                    }
                    "/alsa/asoundrc"
                ]
            }
        ]
        errors false
    }
]

# load card-specific configuration files (on request)

cards.@hooks [
    {
        func load
        files [
            {
                @func concat
                strings [
                    { @func datadir }
                    "/cards/aliases.conf"
                ]
            }
        ]
    }
    {
        func load_for_all_cards
        files [
            {
                @func concat
                strings [
                    { @func datadir }
                    "/cards/"
                    { @func private_string }
                    ".conf"
                ]
            }
        ]
        errors false
    }
]

#
# defaults
#

# show all name hints also for definitions without hint {} section
defaults.namehint.showall on
# show just basic name hints
defaults.namehint.basic on
# show extended name hints
defaults.namehint.extended on
#
defaults.ctl.card 0
defaults.pcm.card 0
defaults.pcm.device 0
defaults.pcm.subdevice -1
defaults.pcm.nonblock 1
defaults.pcm.compat 0
defaults.pcm.minperiodtime 5000     # in us
defaults.pcm.ipc_key 5678293
defaults.pcm.ipc_gid audio
defaults.pcm.ipc_perm 0660
defaults.pcm.tstamp_type default
defaults.pcm.dmix.max_periods 0
defaults.pcm.dmix.channels 2
defaults.pcm.dmix.rate 48000
defaults.pcm.dmix.format unchanged
defaults.pcm.dmix.card defaults.pcm.card
defaults.pcm.dmix.device defaults.pcm.device
defaults.pcm.dsnoop.card defaults.pcm.card
defaults.pcm.dsnoop.device defaults.pcm.device
defaults.pcm.front.card defaults.pcm.card
defaults.pcm.front.device defaults.pcm.device
defaults.pcm.rear.card defaults.pcm.card
defaults.pcm.rear.device defaults.pcm.device
defaults.pcm.center_lfe.card defaults.pcm.card
defaults.pcm.center_lfe.device defaults.pcm.device
defaults.pcm.side.card defaults.pcm.card
defaults.pcm.side.device defaults.pcm.device
#defaults.pcm.surround21.card defaults.pcm.card
#defaults.pcm.surround21.device defaults.pcm.device
#defaults.pcm.surround40.card defaults.pcm.card
#defaults.pcm.surround40.device defaults.pcm.device
#defaults.pcm.surround41.card defaults.pcm.card
#defaults.pcm.surround41.device defaults.pcm.device
#defaults.pcm.surround50.card defaults.pcm.card
#defaults.pcm.surround50.device defaults.pcm.device
#defaults.pcm.surround51.card defaults.pcm.card
#defaults.pcm.surround51.device defaults.pcm.device
#defaults.pcm.surround71.card defaults.pcm.card
#defaults.pcm.surround71.device defaults.pcm.device
defaults.pcm.iec958.card defaults.pcm.card
defaults.pcm.iec958.device defaults.pcm.device
defaults.pcm.modem.card defaults.pcm.card
defaults.pcm.modem.device defaults.pcm.device
defaults.pcm.file_format raw
defaults.pcm.file_truncate true     # truncate files via file or tee PCM
defaults.rawmidi.card 0
defaults.rawmidi.device 0
defaults.rawmidi.subdevice -1
defaults.hwdep.card 0
defaults.hwdep.device 0
defaults.timer.class 2
defaults.timer.sclass 0
defaults.timer.card 0
defaults.timer.device 0
defaults.timer.subdevice 0

#
#  PCM interface
#

pcm.hw {
    @args [ CARD DEV SUBDEV ]
    @args.CARD {
        type string
        default {
            @func getenv
            vars [
                ALSA_PCM_CARD
                ALSA_CARD
            ]
            default {
                @func refer
                name defaults.pcm.card
            }
        }
    }
    @args.DEV {
        type integer
        default {
            @func igetenv
            vars [
                ALSA_PCM_DEVICE
            ]
            default {
                @func refer
                name defaults.pcm.device
            }
        }
    }
    @args.SUBDEV {
        type integer
        default {
            @func refer
            name defaults.pcm.subdevice
        }
    }       
    type hw
    card $CARD
    device $DEV
    subdevice $SUBDEV
    hint {
        show {
            @func refer
            name defaults.namehint.extended
        }
        description "Direct hardware device without any conversions"
    }
}

pcm.plughw {
    @args [ CARD DEV SUBDEV ]
    @args.CARD {
        type string
        default {
            @func getenv
            vars [
                ALSA_PCM_CARD
                ALSA_CARD
            ]
            default {
                @func refer
                name defaults.pcm.card
            }
        }
    }
    @args.DEV {
        type integer
        default {
            @func igetenv
            vars [
                ALSA_PCM_DEVICE
            ]
            default {
                @func refer
                name defaults.pcm.device
            }
        }
    }
    @args.SUBDEV {
        type integer
        default {
            @func refer
            name defaults.pcm.subdevice
        }
    }       
    type plug
    slave.pcm {
        type hw
        card $CARD
        device $DEV
        subdevice $SUBDEV
    }
    hint {
        show {
            @func refer
            name defaults.namehint.extended
        }
        description "Hardware device with all software conversions"
    }
}

pcm.plug {
    @args [ SLAVE ]
    @args.SLAVE {
        type string
    }
    type plug
    slave.pcm $SLAVE
}

pcm.shm {
    @args [ SOCKET PCM ]
    @args.SOCKET {
        type string
    }
    @args.PCM {
        type string
    }
    type shm
    server $SOCKET
    pcm $PCM
}

pcm.tee {
    @args [ SLAVE FILE FORMAT ]
    @args.SLAVE {
        type string
    }
    @args.FILE {
        type string
    }
    @args.FORMAT {
        type string
        default {
            @func refer
            name defaults.pcm.file_format
        }
    }
    type file
    slave.pcm $SLAVE
    file $FILE
    format $FORMAT
    truncate {
        @func refer
        name defaults.pcm.file_truncate
    }
}

pcm.file {
    @args [ FILE FORMAT ]
    @args.FILE {
        type string
    }
    @args.FORMAT {
        type string
        default {
            @func refer
            name defaults.pcm.file_format
        }
    }
    type file
    slave.pcm null
    file $FILE
    format $FORMAT
    truncate {
        @func refer
        name defaults.pcm.file_truncate
    }
}

pcm.null {
    type null
    hint {
        show {
            @func refer
            name defaults.namehint.basic
        }
        description "Discard all samples (playback) or generate zero samples (capture)"
    }
}

# redirect to load-on-demand extended pcm definitions
pcm.cards cards.pcm

pcm.default cards.pcm.default
pcm.sysdefault cards.pcm.default
pcm.front cards.pcm.front
#pcm.rear cards.pcm.rear
#pcm.center_lfe cards.pcm.center_lfe
#pcm.side cards.pcm.side
#pcm.surround21 cards.pcm.surround21
#pcm.surround40 cards.pcm.surround40
#pcm.surround41 cards.pcm.surround41
#pcm.surround50 cards.pcm.surround50
#pcm.surround51 cards.pcm.surround51
#pcm.surround71 cards.pcm.surround71
pcm.iec958 cards.pcm.iec958
pcm.spdif iec958
pcm.hdmi cards.pcm.hdmi
pcm.dmix cards.pcm.dmix
pcm.dsnoop cards.pcm.dsnoop
pcm.modem cards.pcm.modem
pcm.phoneline cards.pcm.phoneline

#
#  Control interface
#
    
ctl.sysdefault {
    type hw
    card {
        @func getenv
        vars [
            ALSA_CTL_CARD
            ALSA_CARD
        ]
        default {
            @func refer
            name defaults.ctl.card
        }
    }
    hint.description "Default control device"
}
ctl.default ctl.sysdefault

ctl.hw {
    @args [ CARD ]
    @args.CARD {
        type string
        default {
            @func getenv
            vars [
                ALSA_CTL_CARD
                ALSA_CARD
            ]
            default {
                @func refer
                name defaults.ctl.card
            }
        }
    }
    type hw
    card $CARD
    hint.description "Direct control device"
}

ctl.shm {
    @args [ SOCKET CTL ]
    @args.SOCKET {
        type string
    }
    @args.CTL {
        type string
    }
    type shm
    server $SOCKET
    ctl $CTL
}

#
#  RawMidi interface
#

rawmidi.default {
    type hw
    card {
        @func getenv
        vars [
            ALSA_RAWMIDI_CARD
            ALSA_CARD
        ]
        default {
            @func refer
            name defaults.rawmidi.card
        }
    }
    device {
        @func igetenv
        vars [
            ALSA_RAWMIDI_DEVICE
        ]
        default {
            @func refer
            name defaults.rawmidi.device
        }
    }
    hint.description "Default raw MIDI device"
}

rawmidi.hw {
    @args [ CARD DEV SUBDEV ]
    @args.CARD {
        type string
        default {
            @func getenv
            vars [
                ALSA_RAWMIDI_CARD
                ALSA_CARD
            ]
            default {
                @func refer
                name defaults.rawmidi.card
            }
        }
    }
    @args.DEV {
        type integer
        default {
            @func igetenv
            vars [
                ALSA_RAWMIDI_DEVICE
            ]
            default {
                @func refer
                name defaults.rawmidi.device
            }
        }
    }
    @args.SUBDEV {
        type integer
        default -1
    }
    type hw
    card $CARD
    device $DEV
    subdevice $SUBDEV
    hint {
        description "Direct rawmidi driver device"
        device $DEV
    }
}

rawmidi.virtual {
    @args [ MERGE ]
    @args.MERGE {
        type string
        default 1
    }
    type virtual
    merge $MERGE
}

#
#  Sequencer interface
#

seq.default {
    type hw
    hint.description "Default sequencer device"
}

seq.hw {
    type hw
}

#
#  HwDep interface
#

hwdep.default {
    type hw
    card {
        @func getenv
        vars [
            ALSA_HWDEP_CARD
            ALSA_CARD
        ]
        default {
            @func refer
            name defaults.hwdep.card
        }
    }
    device {
        @func igetenv
        vars [
            ALSA_HWDEP_DEVICE
        ]
        default {
            @func refer
            name defaults.hwdep.device
        }
    }
    hint.description "Default hardware dependent device"
}

hwdep.hw {
    @args [ CARD DEV ]
    @args.CARD {
        type string
        default {
            @func getenv
            vars [
                ALSA_HWDEP_CARD
                ALSA_CARD
            ]
            default {
                @func refer
                name defaults.hwdep.card
            }
        }
    }
    @args.DEV {
        type integer
        default {
            @func igetenv
            vars [
                ALSA_HWDEP_DEVICE
            ]
            default {
                @func refer
                name defaults.hwdep.device
            }
        }
    }
    type hw
    card $CARD
    device $DEV
    hint {
        description "Direct hardware dependent device"
        device $DEV
    }
}

#
#  Timer interface
#

timer_query.default {
    type hw
}

timer_query.hw {
    type hw
}

timer.default {
    type hw
    class {
        @func refer
        name defaults.timer.class
    }
    sclass {
        @func refer
        name defaults.timer.sclass
    }
    card {
        @func refer
        name defaults.timer.card
    }
    device {
        @func refer
        name defaults.timer.device
    }
    subdevice {
        @func refer
        name defaults.timer.subdevice
    }
    hint.description "Default timer device"
}

timer.hw {
    @args [ CLASS SCLASS CARD DEV SUBDEV ]
    @args.CLASS {
        type integer
        default {
            @func refer
            name defaults.timer.class
        }
    }
    @args.SCLASS {
        type integer
        default {
            @func refer
            name defaults.timer.sclass
        }
    }
    @args.CARD {
        type string
        default {
            @func refer
            name defaults.timer.card
        }
    }
    @args.DEV {
        type integer
        default {
            @func refer
            name defaults.timer.device
        }
    }
    @args.SUBDEV {
        type integer
        default {
            @func refer
            name defaults.timer.subdevice
        }
    }
    type hw
    class $CLASS
    sclass $SCLASS
    card $CARD
    device $DEV
    subdevice $SUBDEV
    hint {
        description "Direct timer device"
        device $DEV
    }
}

Despite the warnings, the module seems to work well (not fully tested).

Still I'd like to remove them if possible. Any suggestions?

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Soren A avatar
mx flag
Soren A
What warnings are you referring to ?
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