Enum AudioFormat

Source

pub enum AudioFormat {
Show 36 variants
    LinearPCM(LinearPcmFlags),
    AC3,
    F60958AC3(StandardFlags),
    AppleIMA4,
    MPEG4AAC(Mpeg4ObjectId),
    MPEG4CELP(Mpeg4ObjectId),
    MPEG4HVXC(Mpeg4ObjectId),
    MPEG4TwinVQ(Mpeg4ObjectId),
    MACE3,
    MACE6,
    ULaw,
    ALaw,
    QDesign,
    QDesign2,
    QUALCOMM,
    MPEGLayer1,
    MPEGLayer2,
    MPEGLayer3,
    TimeCode(AudioTimeStampFlags),
    MIDIStream,
    ParameterValueStream,
    AppleLossless(AppleLosslessFlags),
    MPEG4AAC_HE,
    MPEG4AAC_LD,
    MPEG4AAC_ELD,
    MPEG4AAC_ELD_SBR,
    MPEG4AAC_ELD_V2,
    MPEG4AAC_HE_V2,
    MPEG4AAC_Spatial,
    AMR,
    AMR_WB,
    Audible,
    iLBC,
    DVIIntelIMA,
    MicrosoftGSM,
    AES3,
}

Expand description

A type-safe representation of both the AudioFormatId and their associated flags.

Variants§

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LinearPCM(LinearPcmFlags)

Linear PCM; a non-compressed audio data format with one frame per packet.

Available in OS X v10.0 and later.

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AC3

An AC-3 codec.

Available in OS X v10.2 and later.

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F60958AC3(StandardFlags)

AC-3 codec that provides data packaged for transport over an IEC 60958 compliant digital audio interface.

Available in OS X v10.2 and later.

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AppleIMA4

Apple’s implementation of the IMA 4:1 ADPCM codec.

Available in OS X v10.2 and later.

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MPEG4AAC(Mpeg4ObjectId)

MPEG-4 AAC codec.

Available in OS X v10.2 and later.

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MPEG4CELP(Mpeg4ObjectId)

MPEG-4 CELP codec.

Available in OS X v10.2 and later.

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MPEG4HVXC(Mpeg4ObjectId)

MPEG-4 HVXC codec.

Available in OS X v10.2 and later.

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MPEG4TwinVQ(Mpeg4ObjectId)

MPEG-4 TwinVQ codec.

Available in OS X v10.2 and later.

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MACE3

MACE 3:1.

Available in OS X v10.3 and later.

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MACE6

MACE 6:1.

Available in OS X v10.3 and later.

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ULaw

μLaw 2:1.

Available in OS X v10.3 and later.

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ALaw

aLaw 2:1.

Available in OS X v10.3 and later.

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QDesign

QDesign Music.

Available in OS X v10.3 and later.

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QDesign2

QDesign2 Music.

Available in OS X v10.3 and later.

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QUALCOMM

QUALCOMM PureVoice.

Available in OS X v10.3 and later.

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MPEGLayer1

MPEG-1/2, Layer 1 audio.

Available in OS X v10.3 and later.

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MPEGLayer2

MPEG-1/2, Layer 2 audio.

Available in OS X v10.3 and later.

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MPEGLayer3

MPEG-1/2, Layer 3 audio.

Available in OS X v10.3 and later.

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TimeCode(AudioTimeStampFlags)

A stream of IOAudioTimeStamp structures.

Available in OS X v10.2 and later.

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MIDIStream

A stream of MIDIPacketList structures where the time stamps in the MIDIPacket structures are sample offsets in the stream. The sample_rate field in the StreamFormat structure is used to describe how time is passed in this kind of stream.

An audio unit that receives or generates this stream can use this sample rate together with the number of frames it is rendering.

The sample offsets within the MIDIPacketList can be used to define the time for any MIDI event within the list.

Available in OS X v10.2 and later.

TODO: Review whether or not this audio format should indicate some fundamental change within the StreamFormat.

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ParameterValueStream

A “side-chain” of f32 data that can be fed or generated by an audio unit and that is used to send a high density of parameter value control information.

An audio unit typically runs a parameter value stream at either the sample rate of the audio unit’s audio data, or some integer quotient of this (i.e. a half or a third of the sample rate of the audio).

The sample_rate field in the StreamFormat type describes this relationship.

Available in OS X v10.2 and later.

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