asound

package
v0.0.0-...-8bd4526 Latest Latest
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 Go to latest Published: Dec 19, 2024 License: GPL-3.0 Imports: 4 Imported by: 2

Documentation

Index

Constants

View Source 
const (
	PCMFormatS8        = C.SND_PCM_FORMAT_S8
	PCMFormatU8        = C.SND_PCM_FORMAT_U8
	PCMFormatS16LE     = C.SND_PCM_FORMAT_S16_LE
	PCMFormatS16BE     = C.SND_PCM_FORMAT_S16_BE
	PCMFormatU16LE     = C.SND_PCM_FORMAT_U16_LE
	PCMFormatU16BE     = C.SND_PCM_FORMAT_U16_BE
	PCMFormatS24LE     = C.SND_PCM_FORMAT_S24_LE
	PCMFormatS24BE     = C.SND_PCM_FORMAT_S24_BE
	PCMFormatU24LE     = C.SND_PCM_FORMAT_U24_LE
	PCMFormatU24BE     = C.SND_PCM_FORMAT_U24_BE
	PCMFormatS24_3LE   = C.SND_PCM_FORMAT_S24_3LE
	PCMFormatS24_3BE   = C.SND_PCM_FORMAT_S24_3BE
	PCMFormatS32LE     = C.SND_PCM_FORMAT_S32_LE
	PCMFormatS32BE     = C.SND_PCM_FORMAT_S32_BE
	PCMFormatU32LE     = C.SND_PCM_FORMAT_U32_LE
	PCMFormatU32BE     = C.SND_PCM_FORMAT_U32_BE
	PCMFormatFloatLE   = C.SND_PCM_FORMAT_FLOAT_LE
	PCMFormatFloatBE   = C.SND_PCM_FORMAT_FLOAT_BE
	PCMFormatFloat64LE = C.SND_PCM_FORMAT_FLOAT64_LE
	PCMFormatFloat64BE = C.SND_PCM_FORMAT_FLOAT64_BE
)

The range of sample formats supported by ALSA.

View Source 
const (
	PCMStreamPlayback = C.SND_PCM_STREAM_PLAYBACK
	PCMStreamCapture  = C.SND_PCM_STREAM_CAPTURE
)
View Source 
const (
	PCMAccessMMapInterleaved    = C.SND_PCM_ACCESS_MMAP_INTERLEAVED
	PCMAccessMMapNonInterleaved = C.SND_PCM_ACCESS_MMAP_NONINTERLEAVED
	PCMAccessMMapComplex        = C.SND_PCM_ACCESS_MMAP_COMPLEX
	PCMAccessRWInterleaved      = C.SND_PCM_ACCESS_RW_INTERLEAVED
	PCMAccessRWNonInterleaved   = C.SND_PCM_ACCESS_RW_NONINTERLEAVED
)
View Source 
const (
	MixerSChanUnknown = C.SND_MIXER_SCHN_UNKNOWN
	/* Front left */
	MixerSChanFrontLeft = C.SND_MIXER_SCHN_FRONT_LEFT
	/* Front right */
	MixerSChanFrontRight = C.SND_MIXER_SCHN_FRONT_RIGHT
	/* Rear left */
	MixerSChanRearLeft = C.SND_MIXER_SCHN_REAR_LEFT
	/* Rear right */
	MixerSChanRearRight = C.SND_MIXER_SCHN_REAR_RIGHT
	/* Front center */
	MixerSChanFrontCenter = C.SND_MIXER_SCHN_FRONT_CENTER
	/* Woofer */
	MixerSChanWoofer = C.SND_MIXER_SCHN_WOOFER
	/* Side Left */
	MixerSChanSideLeft = C.SND_MIXER_SCHN_SIDE_LEFT
	/* Side Right */
	MixerSChanSideRight = C.SND_MIXER_SCHN_SIDE_RIGHT
	/* Rear Center */
	MixerSChanRearCenter = C.SND_MIXER_SCHN_REAR_CENTER
	/* Mono (Front left alias) */
	MixerSChanMono = C.SND_MIXER_SCHN_MONO
	MixerSChanLast = C.SND_MIXER_SCHN_LAST
)
View Source 
const (
	MixerSAbstractNone  = C.SND_MIXER_SABSTRACT_NONE
	MixerSAbstractBasic = C.SND_MIXER_SABSTRACT_BASIC
)

Variables

View Source 
var ErrUnderrun = errors.New("underrun")

Functions

func CardLoad 

func CardLoad(card int) bool

Try to load the driver for a card.

return true if driver is present, false if driver is not present

func CardNext 

func CardNext(rcard *int) error

Try to determine the next card.

Tries to determine the next card from given card number. If card number is -1, then the first available card is returned. If the result card number is -1, no more cards are available.

Types

type CTL 

type CTL struct {
	Ptr unsafe.Pointer
}

CTL handle

func CTLOpen 

func CTLOpen(name string, mode int) (CTL, error)

Opens a CTL.

func (CTL) CardInfo 

func (ctl CTL) CardInfo(info CTLCardInfo) error

Get card related information.

func (CTL) Close 

func (ctl CTL) Close() error

close CTL handle

Closes the specified CTL handle and frees all associated resources.

func (CTL) PCMInfo 

func (ctl CTL) PCMInfo(info PCMInfo) error

Get info about a PCM device.

func (CTL) PCMNextDevice 

func (ctl CTL) PCMNextDevice(device *int) error

Get next PCM device number.

type CTLCardInfo 

type CTLCardInfo struct {
	Ptr unsafe.Pointer
}

CTL card info container

func NewCTLCardInfo 

func NewCTLCardInfo() (CTLCardInfo, error)

func (CTLCardInfo) Free 

func (info CTLCardInfo) Free()

func (CTLCardInfo) GetCard 

func (info CTLCardInfo) GetCard() int

Get card number from a CTL card info.

func (CTLCardInfo) GetComponents 

func (info CTLCardInfo) GetComponents() string

Get card component list from a CTL card info.

func (CTLCardInfo) GetDriver 

func (info CTLCardInfo) GetDriver() string

Get card driver name from a CTL card info.

func (CTLCardInfo) GetID 

func (info CTLCardInfo) GetID() string

Get card identifier from a CTL card info.

func (CTLCardInfo) GetLongName 

func (info CTLCardInfo) GetLongName() string

Get card long name from a CTL card info.

func (CTLCardInfo) GetMixerName 

func (info CTLCardInfo) GetMixerName() string

Get card mixer name from a CTL card info.

func (CTLCardInfo) GetName 

func (info CTLCardInfo) GetName() string

Get card name from a CTL card info.

type DeviceNameHints 

type DeviceNameHints struct {
	// it pointer to a array of unsafe.Pointer, type in C is void**
	Ptr *unsafe.Pointer
}

func GetDeviceNameHints 

func GetDeviceNameHints(card int, iface string) (DeviceNameHints, error)

Get a set of device name hints.

func (DeviceNameHints) Free 

func (v DeviceNameHints) Free()

func (DeviceNameHints) Iter 

func (v DeviceNameHints) Iter() *DeviceNameHintsIter

type DeviceNameHintsIter 

type DeviceNameHintsIter struct {
	// contains filtered or unexported fields
}

func (DeviceNameHintsIter) Get 

func (iter DeviceNameHintsIter) Get(id string) string

func (*DeviceNameHintsIter) Next 

func (iter *DeviceNameHintsIter) Next() bool

type Error 

type Error struct {
	// contains filtered or unexported fields
}

func (*Error) Error 

func (err *Error) Error() string

type Mixer 

type Mixer struct {
	Ptr unsafe.Pointer
}

func OpenMixer 

func OpenMixer(mode int) (Mixer, error)

Opens an empty mixer.

func (Mixer) Attach 

func (m Mixer) Attach(name string) error

Attach an HCTL specified with the CTL device name to an opened mixer.

func (Mixer) Close 

func (m Mixer) Close() error

Close a mixer and free all related resources.

func (Mixer) FindSelem 

func (m Mixer) FindSelem(id MixerSelemId) MixerElem

Find a mixer simple element.

func (Mixer) FirstElem 

func (m Mixer) FirstElem() MixerElem

get first element for a mixer

func (Mixer) Free 

func (m Mixer) Free()

Unload all mixer elements and free all related resources.

func (Mixer) Load 

func (m Mixer) Load() error

Load a mixer elements.

func (Mixer) SelemRegister 

func (m Mixer) SelemRegister(options *MixerSelemRegopt, class *MixerClass) error

Register mixer simple element class.

type MixerClass 

type MixerClass struct {
	Ptr unsafe.Pointer
}

type MixerElem 

type MixerElem struct {
	Ptr unsafe.Pointer
}

func (MixerElem) GetSelemId 

func (e MixerElem) GetSelemId(id MixerSelemId)

Get mixer simple element identifier.

func (MixerElem) Next 

func (e MixerElem) Next() MixerElem

get next mixer element

func (MixerElem) Prev 

func (e MixerElem) Prev() MixerElem

get previous mixer element

func (MixerElem) SelemGetCaptureDB 

func (e MixerElem) SelemGetCaptureDB(channel MixerSelemChannelId) (int, error)

Return value of capture volume in dB control of a mixer simple element. return value (dB * 100)

func (MixerElem) SelemGetCaptureDBRange 

func (e MixerElem) SelemGetCaptureDBRange() (min, max int)

Get range in dB for capture volume of a mixer simple element. return minimum (dB * 100) and maximum (dB * 100)

func (MixerElem) SelemGetCaptureGroup 

func (e MixerElem) SelemGetCaptureGroup() int

Return info about capture switch control of a mixer simple element. return group for switch exclusivity

func (MixerElem) SelemGetCaptureSwitch 

func (e MixerElem) SelemGetCaptureSwitch(channel MixerSelemChannelId) (bool, error)

Return value of capture switch control of a mixer simple element.

func (MixerElem) SelemGetCaptureVolume 

func (e MixerElem) SelemGetCaptureVolume(channel MixerSelemChannelId) (int, error)

Return value of capture volume control of a mixer simple element.

func (MixerElem) SelemGetCaptureVolumeRange 

func (e MixerElem) SelemGetCaptureVolumeRange() (min, max int)

Get range for capture volume of a mixer simple element.

func (MixerElem) SelemGetEnumItem 

func (e MixerElem) SelemGetEnumItem(channel MixerSelemChannelId) (uint, error)

get the current selected enumerated item for the given mixer simple element

func (MixerElem) SelemGetEnumItemName 

func (e MixerElem) SelemGetEnumItemName(item uint, maxLen int) (string, error)

get the enumerated item string for the given mixer simple element

func (MixerElem) SelemGetEnumItems 

func (e MixerElem) SelemGetEnumItems() (int, error)

Return the number of enumerated items of the given mixer simple element.

func (MixerElem) SelemGetPlaybackDB 

func (e MixerElem) SelemGetPlaybackDB(channel MixerSelemChannelId) (int, error)

Return value of playback volume in dB control of a mixer simple element. return value (dB * 100)

func (MixerElem) SelemGetPlaybackDBRange 

func (e MixerElem) SelemGetPlaybackDBRange() (min, max int)

Get range in dB for playback volume of a mixer simple element. return minimum (dB * 100) and maximum (dB * 100)

func (MixerElem) SelemGetPlaybackSwitch 

func (e MixerElem) SelemGetPlaybackSwitch(channel MixerSelemChannelId) (bool, error)

Return value of playback switch control of a mixer simple element.

func (MixerElem) SelemGetPlaybackVolume 

func (e MixerElem) SelemGetPlaybackVolume(channel MixerSelemChannelId) (int, error)

Return value of playback volume control of a mixer simple element.

func (MixerElem) SelemGetPlaybackVolumeRange 

func (e MixerElem) SelemGetPlaybackVolumeRange() (min, max int)

Get range for playback volume of a mixer simple element.

func (MixerElem) SelemHasCaptureChannel 

func (e MixerElem) SelemHasCaptureChannel(channel MixerSelemChannelId) bool

Get info about channels of capture stream of a mixer simple element. return false if channel is not present, true if present

func (MixerElem) SelemHasCaptureSwitch 

func (e MixerElem) SelemHasCaptureSwitch() bool

Return info about capture switch control existence of a mixer simple element. return false if no control is present, true if it's present

func (MixerElem) SelemHasCaptureSwitchExclusive 

func (e MixerElem) SelemHasCaptureSwitchExclusive() bool

Return info about capture switch control of a mixer simple element. return false if control is separated per element, true if control acts on other elements too (i.e. only one active at a time inside a group)

func (MixerElem) SelemHasCaptureSwitchJoined 

func (e MixerElem) SelemHasCaptureSwitchJoined() bool

Return info about capture switch control of a mixer simple element. return false if control is separated per channel, true if control acts on all channels together

func (MixerElem) SelemHasCaptureVolume 

func (e MixerElem) SelemHasCaptureVolume() bool

Return info about capture volume control of a mixer simple element. return false if no control is present, true if it's present

func (MixerElem) SelemHasCaptureVolumeJoined 

func (e MixerElem) SelemHasCaptureVolumeJoined() bool

Return info about capture volume control of a mixer simple element. return false if control is separated per channel, true if control acts on all channels together

func (MixerElem) SelemHasCommonSwitch 

func (e MixerElem) SelemHasCommonSwitch() bool

Return true if mixer simple element has only one switch control for both playback and capture.

func (MixerElem) SelemHasCommonVolume 

func (e MixerElem) SelemHasCommonVolume() bool

Return true if mixer simple element has only one volume control for both playback and capture.

func (MixerElem) SelemHasPlaybackChannel 

func (e MixerElem) SelemHasPlaybackChannel(channel MixerSelemChannelId) bool

Get info about channels of playback stream of a mixer simple element. return false if channel is not present, true if present

func (MixerElem) SelemHasPlaybackSwitch 

func (e MixerElem) SelemHasPlaybackSwitch() bool

Return info about playback switch control existence of a mixer simple element.

func (MixerElem) SelemHasPlaybackSwitchJoined 

func (e MixerElem) SelemHasPlaybackSwitchJoined() bool

Return info about playback switch control of a mixer simple element. return false if control is separated per channel, true if control acts on all channels together

func (MixerElem) SelemHasPlaybackVolume 

func (e MixerElem) SelemHasPlaybackVolume() bool

Return info about playback volume control of a mixer simple element. return false if no control is present, true if it's present

func (MixerElem) SelemHasPlaybackVolumeJoined 

func (e MixerElem) SelemHasPlaybackVolumeJoined() bool

Return info about playback volume control of a mixer simple element. return false if control is separated per channel, true if control acts on all channels together

func (MixerElem) SelemIsActive 

func (e MixerElem) SelemIsActive() bool

Get info about the active state of a mixer simple element.

func (MixerElem) SelemIsCaptureMono 

func (e MixerElem) SelemIsCaptureMono() bool

Get info about channels of capture stream of a mixer simple element. return false if not mono, true if mono

func (MixerElem) SelemIsEnumCapture 

func (e MixerElem) SelemIsEnumCapture() bool

Return true if mixer simple enumerated element belongs to the capture direction.

func (MixerElem) SelemIsEnumPlayback 

func (e MixerElem) SelemIsEnumPlayback() bool

Return true if mixer simple enumerated element belongs to the playback direction.

func (MixerElem) SelemIsEnumerated 

func (e MixerElem) SelemIsEnumerated() bool

Return true if mixer simple element is an enumerated control.

func (MixerElem) SelemIsPlaybackMono 

func (e MixerElem) SelemIsPlaybackMono() bool

Get info about channels of playback stream of a mixer simple element. return false if not mono, true if mono

func (MixerElem) SelemSetCaptureDB 

func (e MixerElem) SelemSetCaptureDB(channel MixerSelemChannelId, value, dir int) error

Set value in dB of capture volume control of a mixer simple element. value: control value in dB * 100 dir: rounding mode - rounds up if dir > 0, otherwise rounds down

func (MixerElem) SelemSetCaptureDBAll 

func (e MixerElem) SelemSetCaptureDBAll(value, dir int) error

Set value in dB of capture volume control for all channels of a mixer simple element. value: control value in dB * 100 dir: rounding mode - rounds up if dir > 0, otherwise rounds down

func (MixerElem) SelemSetCaptureSwitch 

func (e MixerElem) SelemSetCaptureSwitch(channel MixerSelemChannelId, value bool) error

Set value of capture switch control of a mixer simple element.

func (MixerElem) SelemSetCaptureSwitchAll 

func (e MixerElem) SelemSetCaptureSwitchAll(value bool) error

Set value of capture switch control for all channels of a mixer simple element.

func (MixerElem) SelemSetCaptureVolume 

func (e MixerElem) SelemSetCaptureVolume(channel MixerSelemChannelId, value int) error

Set value of capture volume control of a mixer simple element.

func (MixerElem) SelemSetCaptureVolumeAll 

func (e MixerElem) SelemSetCaptureVolumeAll(value int) error

Set value of capture volume control for all channels of a mixer simple element.

func (MixerElem) SelemSetPlaybackDB 

func (e MixerElem) SelemSetPlaybackDB(channel MixerSelemChannelId, value, dir int) error

Set value in dB of playback volume control of a mixer simple element. value: control value in dB * 100 dir: rounding mode - rounds up if dir > 0, otherwise rounds down

func (MixerElem) SelemSetPlaybackDBAll 

func (e MixerElem) SelemSetPlaybackDBAll(value, dir int) error

Set value in dB of playback volume control for all channels of a mixer simple element. value: control value in dB * 100 dir: rounding mode - rounds up if dir > 0, otherwise rounds down

func (MixerElem) SelemSetPlaybackSwitch 

func (e MixerElem) SelemSetPlaybackSwitch(channel MixerSelemChannelId, value bool) error

Set value of playback switch control of a mixer simple element.

func (MixerElem) SelemSetPlaybackSwitchAll 

func (e MixerElem) SelemSetPlaybackSwitchAll(value bool) error

Set value of playback switch control for all channels of a mixer simple element.

func (MixerElem) SelemSetPlaybackVolume 

func (e MixerElem) SelemSetPlaybackVolume(channel MixerSelemChannelId, value int) error

Set value of playback volume control of a mixer simple element.

func (MixerElem) SelemSetPlaybackVolumeAll 

func (e MixerElem) SelemSetPlaybackVolumeAll(value int) error

Set value of playback volume control for all channels of a mixer simple element.

type MixerSelem 

type MixerSelem struct {
	Ptr unsafe.Pointer
}

type MixerSelemChannelId 

type MixerSelemChannelId C.snd_mixer_selem_channel_id_t

Mixer simple element channel identifier

func (MixerSelemChannelId) Name 

func (id MixerSelemChannelId) Name() string

Return name of mixer simple element channel.

type MixerSelemId 

type MixerSelemId struct {
	Ptr unsafe.Pointer
}

func NewMixerSelemId 

func NewMixerSelemId() (MixerSelemId, error)

func (MixerSelemId) Free 

func (id MixerSelemId) Free()

func (MixerSelemId) GetIndex 

func (id MixerSelemId) GetIndex() uint

Get index part of a mixer simple element identifier.

func (MixerSelemId) GetName 

func (id MixerSelemId) GetName() string

Get name part of mixer simple element identifier.

type MixerSelemRegopt 

type MixerSelemRegopt struct {
	// contains filtered or unexported fields
}

func (*MixerSelemRegopt) Free 

func (opt *MixerSelemRegopt) Free()

func (*MixerSelemRegopt) SetCapturePCM 

func (opt *MixerSelemRegopt) SetCapturePCM(pcm PCM)

func (*MixerSelemRegopt) SetDevice 

func (opt *MixerSelemRegopt) SetDevice(device string)

func (*MixerSelemRegopt) SetPlaybackPCM 

func (opt *MixerSelemRegopt) SetPlaybackPCM(pcm PCM)

func (*MixerSelemRegopt) SetVer 

func (opt *MixerSelemRegopt) SetVer(ver int)

type Output 

type Output struct {
	Ptr unsafe.Pointer
}

Internal structure for an output object.

The ALSA library uses a pointer to this structure as a handle to an output object. Applications don't access its contents directly.

func OpenOutput 

func OpenOutput(file, mode string) (Output, error)

Creates a new output object writing to a file.

func (Output) Close 

func (o Output) Close() error

Closes an output handle.

func (Output) Flush 

func (o Output) Flush() error

Flushes an output handle (like fflush(3)).

func (Output) Printf 

func (o Output) Printf(format string, a ...interface{}) error

func (Output) Println 

func (o Output) Println(a ...interface{}) error

func (Output) WriteString 

func (o Output) WriteString(str string) error

Writes a string to an output handle (like fputs(3)).

type PCM 

type PCM struct {
	Ptr unsafe.Pointer
}

PCM handle

func OpenPCM 

func OpenPCM(name string, stream PCMStream, mode int) (PCM, error)

Opens a PCM.

func (PCM) Close 

func (pcm PCM) Close() error

close PCM handle

Closes the specified PCM handle and frees all associated resources.

func (PCM) Drain 

func (pcm PCM) Drain() error

Stop a PCM preserving pending frames.

For playback wait for all pending frames to be played and then stop the PCM. For capture stop PCM permitting to retrieve residual frames.

func (PCM) Drop 

func (pcm PCM) Drop() error

Stop a PCM dropping pending frames.

This function stops the PCM immediately. The pending samples on the buffer are ignored.

func (PCM) Dump 

func (pcm PCM) Dump(out Output) error

func (PCM) DumpHwSetup 

func (pcm PCM) DumpHwSetup(out Output) error

func (PCM) DumpSetup 

func (pcm PCM) DumpSetup(out Output) error

func (PCM) DumpSwSetup 

func (pcm PCM) DumpSwSetup(out Output) error

func (PCM) HwFree 

func (pcm PCM) HwFree() error

Remove PCM hardware configuration and free associated resources.

func (PCM) HwParams 

func (pcm PCM) HwParams(params PCMHwParams) error

Install one PCM hardware configuration chosen from a configuration space and snd_pcm_prepare it.

The configuration is chosen fixing single parameters in this order: first access, first format, first subformat, min channels, min rate, min period time, max buffer size, min tick time. If no mutually compatible set of parameters can be chosen, a negative error code will be returned.

After this call, snd_pcm_prepare() is called automatically and the stream is brought to SND_PCM_STATE_PREPARED state.

The hardware parameters cannot be changed when the stream is running (active). The software parameters can be changed at any time.

The configuration space will be updated to reflect the chosen parameters.

func (PCM) HwParamsAny 

func (pcm PCM) HwParamsAny(params PCMHwParams)

Fill params with a full configuration space for a PCM.

The configuration space will be filled with all possible ranges for the PCM device.

func (PCM) HwParamsSetAccess 

func (pcm PCM) HwParamsSetAccess(params PCMHwParams, access PCMAccess) error

Restrict a configuration space to contain only one access type.

func (PCM) HwParamsSetBufferSize 

func (pcm PCM) HwParamsSetBufferSize(params PCMHwParams, val PCMUFrames) error

Restrict a configuration space to contain only one buffer size.

func (PCM) HwParamsSetBufferTimeNear 

func (pcm PCM) HwParamsSetBufferTimeNear(params PCMHwParams, val *uint) (int, error)

Restrict a configuration space to have buffer time nearest to a target.

func (PCM) HwParamsSetChannels 

func (pcm PCM) HwParamsSetChannels(params PCMHwParams, val uint) error

Restrict a configuration space to contain only one channels count.

func (PCM) HwParamsSetFormat 

func (pcm PCM) HwParamsSetFormat(params PCMHwParams, format PCMFormat) error

Restrict a configuration space to contain only one format.

func (PCM) HwParamsSetPeriodSize 

func (pcm PCM) HwParamsSetPeriodSize(params PCMHwParams, val PCMUFrames, dir int) error

Restrict a configuration space to contain only one period size.

func (PCM) HwParamsSetPeriodSizeNear 

func (pcm PCM) HwParamsSetPeriodSizeNear(params PCMHwParams, val PCMUFrames) (PCMUFrames, int, error)

Restrict a configuration space to have period size nearest to a target.

func (PCM) HwParamsSetPeriodTimeNear 

func (pcm PCM) HwParamsSetPeriodTimeNear(params PCMHwParams, val *uint) (int, error)

Restrict a configuration space to have period time nearest to a target.

func (PCM) HwParamsSetRate 

func (pcm PCM) HwParamsSetRate(params PCMHwParams, val uint, dir int) error

Restrict a configuration space to contain only one rate.

func (PCM) HwParamsSetRateNear 

func (pcm PCM) HwParamsSetRateNear(params PCMHwParams, val *uint) (int, error)

Restrict a configuration space to have rate nearest to a target.

func (PCM) Info 

func (pcm PCM) Info(info PCMInfo) error

Obtain general (static) information for PCM handle.

func (PCM) Name 

func (pcm PCM) Name() string

get identifier of PCM handle

func (PCM) Pause 

func (pcm PCM) Pause(enable bool) error

Pause/resume PCM.

func (PCM) Prepare 

func (pcm PCM) Prepare() error

Prepare PCM for use.

func (PCM) Recover 

func (pcm PCM) Recover(err int, silent bool) error

Recover the stream state from an error or suspend.

This a high-level helper function building on other functions.

This functions handles -EINTR (interrupted system call), -EPIPE (overrun or underrun) and -ESTRPIPE (stream is suspended) error codes trying to prepare given stream for next I/O.

Note that this function returs the original error code when it is not handled inside this function (for example -EAGAIN is returned back).

func (PCM) Reset 

func (pcm PCM) Reset() error

Reset PCM position.

Reduce PCM delay to 0.

func (PCM) Resume 

func (pcm PCM) Resume() error

Resume from suspend, no samples are lost.

This function can be used when the stream is in the suspend state to do the fine resume from this state. Not all hardware supports this feature, when an -ENOSYS error is returned, use the PCM.Prepare() function to recovery.

func (PCM) Start 

func (pcm PCM) Start() error

Start a PCM.

func (PCM) State 

func (pcm PCM) State() PCMState

Return PCM state.

This is a faster way to obtain only the PCM state without calling PCM.Status().

func (PCM) Stream 

func (pcm PCM) Stream() PCMStream

get stream for a PCM handle

func (PCM) Type 

func (pcm PCM) Type() PCMType

get type of PCM handle

func (PCM) Writei 

func (pcm PCM) Writei(buffer unsafe.Pointer, size PCMUFrames) (PCMUFrames, error)

Write interleaved frames to a PCM.

If the blocking behaviour is selected and it is running, then routine waits until all requested frames are played or put to the playback ring buffer. The returned number of frames can be less only if a signal or underrun occurred.

If the non-blocking behaviour is selected, then routine doesn't wait at all.

type PCMAccess 

type PCMAccess C.snd_pcm_access_t

PCM access type

func (PCMAccess) Name 

func (access PCMAccess) Name() string

get name of PCM access type

type PCMClass 

type PCMClass C.snd_pcm_class_t

PCM class

type PCMFormat 

type PCMFormat C.snd_pcm_format_t

Format is the type used for specifying sample formats.

func (PCMFormat) Name 

func (format PCMFormat) Name() string

func (PCMFormat) Size 

func (format PCMFormat) Size(samples uint) int

Size return bytes needed to store a quantity of PCM sample.

type PCMHwParams 

type PCMHwParams struct {
	Ptr unsafe.Pointer
}

PCM hardware configuration space container

snd_pcm_hw_params_t is an opaque structure which contains a set of possible PCM hardware configurations. For example, a given instance might include a range of buffer sizes, a range of period sizes, and a set of several sample formats. Some subset of all possible combinations these sets may be valid, but not necessarily any combination will be valid.

When a parameter is set or restricted using a snd_pcm_hw_params_set* function, all of the other ranges will be updated to exclude as many impossible configurations as possible. Attempting to set a parameter outside of its acceptable range will result in the function failing and an error code being returned.

func NewPCMHwParams 

func NewPCMHwParams() (PCMHwParams, error)

func (PCMHwParams) Dump 

func (params PCMHwParams) Dump(out Output) error

Dump a PCM hardware configuration space.

func (PCMHwParams) Free 

func (params PCMHwParams) Free()

func (PCMHwParams) GetBufferTimeMax 

func (params PCMHwParams) GetBufferTimeMax() (val uint, dir int, err error)

Extract maximum buffer time from a configuration space. val approximate maximum buffer duration in us

func (PCMHwParams) GetPeriodSize 

func (params PCMHwParams) GetPeriodSize() (PCMUFrames, int, error)

Extract period size from a configuration space.

func (PCMHwParams) GetPeriodTime 

func (params PCMHwParams) GetPeriodTime() (uint, int, error)

Extract period time from a configuration space. time unit us microseconds

type PCMInfo 

type PCMInfo struct {
	Ptr unsafe.Pointer
}

PCM generic info container

func NewPCMInfo 

func NewPCMInfo() (PCMInfo, error)

func (PCMInfo) Free 

func (info PCMInfo) Free()

func (PCMInfo) GetCard 

func (info PCMInfo) GetCard() int

Get card from a PCM info container.

func (PCMInfo) GetClass 

func (info PCMInfo) GetClass() PCMClass

Get class from a PCM info container.

func (PCMInfo) GetID 

func (info PCMInfo) GetID() string

Get id from a PCM info container.

func (PCMInfo) GetName 

func (info PCMInfo) GetName() string

Get name from a PCM info container.

func (PCMInfo) GetStream 

func (info PCMInfo) GetStream() PCMStream

Get stream (direction) from a PCM info container.

func (PCMInfo) GetSubclass 

func (info PCMInfo) GetSubclass() PCMSubclass

Get subclass from a PCM info container.

func (PCMInfo) GetSubdevice 

func (info PCMInfo) GetSubdevice() uint

Get subdevice from a PCM info container.

func (PCMInfo) GetSubdeviceName 

func (info PCMInfo) GetSubdeviceName() string

Get subdevice name from a PCM info container.

func (PCMInfo) GetSubdevicesAvail 

func (info PCMInfo) GetSubdevicesAvail() uint

Get available subdevices count from a PCM info container.

func (PCMInfo) GetSubdevicesCount 

func (info PCMInfo) GetSubdevicesCount() uint

Get subdevices count from a PCM info container.

func (PCMInfo) SetDevice 

func (info PCMInfo) SetDevice(val uint)

Set wanted device inside a PCM info container

func (PCMInfo) SetStream 

func (info PCMInfo) SetStream(val PCMStream)

Set wanted stream inside a PCM info container

func (PCMInfo) SetSubdevice 

func (info PCMInfo) SetSubdevice(val uint)

Set wanted sub device inside a PCM info container

type PCMSFrames 

type PCMSFrames C.snd_pcm_sframes_t

Signed frames quantity

type PCMState 

type PCMState C.snd_pcm_state_t

PCM state

type PCMStream 

type PCMStream C.snd_pcm_stream_t

PCM Stream

func (PCMStream) Name 

func (stream PCMStream) Name() string

type PCMSubclass 

type PCMSubclass C.snd_pcm_subclass_t

PCM subclass

type PCMSubformat 

type PCMSubformat C.snd_pcm_subformat_t

PCM sample subformat

func (PCMSubformat) Desc 

func (subformat PCMSubformat) Desc() string

func (PCMSubformat) Name 

func (subformat PCMSubformat) Name() string

type PCMType 

type PCMType C.snd_pcm_type_t

PCM type

func (PCMType) Name 

func (typ PCMType) Name() string

type PCMUFrames 

type PCMUFrames C.snd_pcm_uframes_t

Unsigned frames quantity

Source Files

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