[][src]Struct gstreamer_audio::AudioDecoder

pub struct AudioDecoder(_, _);

This base class is for audio decoders turning encoded data into raw audio samples.

GstAudioDecoder and subclass should cooperate as follows.

Configuration

As of configuration stage, and throughout processing, GstAudioDecoder provides various (context) parameters, e.g. describing the format of output audio data (valid when output caps have been set) or current parsing state. Conversely, subclass can and should configure context to inform base class of its expectation w.r.t. buffer handling.

Data processing

Shutdown phase

Subclass is responsible for providing pad template caps for source and sink pads. The pads need to be named "sink" and "src". It also needs to set the fixed caps on srcpad, when the format is ensured. This is typically when base class calls subclass' set_format function, though it might be delayed until calling AudioDecoder::finish_frame.

In summary, above process should have subclass concentrating on codec data processing while leaving other matters to base class, such as most notably timestamp handling. While it may exert more control in this area (see e.g. pre_push), it is very much not recommended.

In particular, base class will try to arrange for perfect output timestamps as much as possible while tracking upstream timestamps. To this end, if deviation between the next ideal expected perfect timestamp and upstream exceeds AudioDecoder:tolerance, then resync to upstream occurs (which would happen always if the tolerance mechanism is disabled).

In non-live pipelines, baseclass can also (configurably) arrange for output buffer aggregation which may help to redue large(r) numbers of small(er) buffers being pushed and processed downstream. Note that this feature is only available if the buffer layout is interleaved. For planar buffers, the decoder implementation is fully responsible for the output buffer size.

On the other hand, it should be noted that baseclass only provides limited seeking support (upon explicit subclass request), as full-fledged support should rather be left to upstream demuxer, parser or alike. This simple approach caters for seeking and duration reporting using estimated input bitrates.

Things that subclass need to take care of:

Implements

AudioDecoderExt, gst::ElementExt, gst::ObjectExt, glib::object::ObjectExt, AudioDecoderExtManual

Trait Implementations

impl Clone for AudioDecoder[src]

impl Debug for AudioDecoder[src]

impl Eq for AudioDecoder[src]

impl Hash for AudioDecoder[src]

impl IsA<Element> for AudioDecoder[src]

impl IsA<Object> for AudioDecoder[src]

impl Ord for AudioDecoder[src]

impl<T: ObjectType> PartialEq<T> for AudioDecoder[src]

impl<T: ObjectType> PartialOrd<T> for AudioDecoder[src]

impl Send for AudioDecoder[src]

impl StaticType for AudioDecoder[src]

impl Sync for AudioDecoder[src]

Auto Trait Implementations

impl RefUnwindSafe for AudioDecoder

impl Unpin for AudioDecoder

impl UnwindSafe for AudioDecoder

Blanket Implementations

impl<T> Any for T where
    T: 'static + ?Sized
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impl<T> Borrow<T> for T where
    T: ?Sized
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impl<T> BorrowMut<T> for T where
    T: ?Sized
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impl<Super, Sub> CanDowncast<Sub> for Super where
    Sub: IsA<Super>,
    Super: IsA<Super>, 
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impl<T> Cast for T where
    T: ObjectType
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impl<O> ElementExt for O where
    O: IsA<Element>, 
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impl<O> ElementExtManual for O where
    O: IsA<Element>, 
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impl<T> From<T> for T[src]

impl<O> GObjectExtManualGst for O where
    O: IsA<Object>, 
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impl<O> GstObjectExt for O where
    O: IsA<Object>, 
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impl<O> GstObjectExtManual for O where
    O: IsA<Object>, 
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impl<T, U> Into<U> for T where
    U: From<T>, 
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impl<T> ObjectExt for T where
    T: ObjectType
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impl<'a, T> ToGlibContainerFromSlice<'a, *const GList> for T where
    T: GlibPtrDefault + ToGlibPtr<'a, <T as GlibPtrDefault>::GlibType>, 
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impl<'a, T> ToGlibContainerFromSlice<'a, *const GPtrArray> for T where
    T: GlibPtrDefault + ToGlibPtr<'a, <T as GlibPtrDefault>::GlibType>, 
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impl<'a, T> ToGlibContainerFromSlice<'a, *mut GArray> for T where
    T: GlibPtrDefault + ToGlibPtr<'a, <T as GlibPtrDefault>::GlibType>, 
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impl<'a, T> ToGlibContainerFromSlice<'a, *mut GList> for T where
    T: GlibPtrDefault + ToGlibPtr<'a, <T as GlibPtrDefault>::GlibType>, 
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impl<'a, T> ToGlibContainerFromSlice<'a, *mut GPtrArray> for T where
    T: GlibPtrDefault + ToGlibPtr<'a, <T as GlibPtrDefault>::GlibType>, 
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impl<T> ToOwned for T where
    T: Clone
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type Owned = T

The resulting type after obtaining ownership.

impl<T> ToSendValue for T where
    T: ToValue + SetValue + Send + ?Sized
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impl<T> ToValue for T where
    T: SetValue + ?Sized
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impl<T, U> TryFrom<U> for T where
    U: Into<T>, 
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type Error = Infallible

The type returned in the event of a conversion error.

impl<T, U> TryInto<U> for T where
    U: TryFrom<T>, 
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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.