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<title>GstAudioAggregator: GStreamer Base Plugins 1.0 Library Reference Manual</title>
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<meta name="generator" content="DocBook XSL Stylesheets V1.79.1">
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<link rel="home" href="index.html" title="GStreamer Base Plugins 1.0 Library Reference Manual">
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<link rel="up" href="gstreamer-audio.html" title="Audio Library">
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<link rel="prev" href="gst-plugins-base-libs-GstAudioDownmixMeta.html" title="GstAudioDownmixMeta">
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</head>
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<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
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Top |
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Description |
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Object Hierarchy |
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Properties
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GstAudioAggregator
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GstAudioAggregator — Base class that manages a set of audio input pads
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with the purpose of aggregating or mixing their raw audio input buffers
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Functions
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void
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gst_audio_aggregator_set_sink_caps ()
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Properties
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guint64
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alignment-threshold
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Read / Write
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guint64
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discont-wait
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Read / Write
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guint64
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output-buffer-duration
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Read / Write
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GstStructure *
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converter-config
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Read / Write
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Types and Values
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struct
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GstAudioAggregator
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struct
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GstAudioAggregatorClass
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struct
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GstAudioAggregatorPad
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struct
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GstAudioAggregatorPadClass
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struct
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GstAudioAggregatorConvertPad
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struct
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GstAudioAggregatorConvertPadClass
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Object Hierarchy
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GObject
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╰── GInitiallyUnowned
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╰── GstObject
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├── GstElement
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│ ╰── GstAggregator
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│ ╰── GstAudioAggregator
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╰── GstPad
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╰── GstAggregatorPad
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╰── GstAudioAggregatorPad
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╰── GstAudioAggregatorConvertPad
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Includes
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#include <gst/audio/audio.h>
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Description
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Subclasses must use (a subclass of) GstAudioAggregatorPad for both
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their source and sink pads,
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gst_element_class_add_static_pad_template_with_gtype() is a convenient
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helper.
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GstAudioAggregator can perform conversion on the data arriving
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on its sink pads, based on the format expected downstream: in order
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to enable that behaviour, the GType of the sink pads must either be
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a (subclass of) GstAudioAggregatorConvertPad to use the default
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GstAudioConverter implementation, or a subclass of GstAudioAggregatorPad
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implementing GstAudioAggregatorPad.convert_buffer.
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To allow for the output caps to change, the mechanism is the same as
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above, with the GType of the source pad.
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See GstAudioMixer for an example.
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When conversion is enabled, GstAudioAggregator will accept
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any type of raw audio caps and perform conversion
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on the data arriving on its sink pads, with whatever downstream
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expects as the target format.
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In case downstream caps are not fully fixated, it will use
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the first configured sink pad to finish fixating its source pad
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caps.
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A notable exception for now is the sample rate, sink pads must
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have the same sample rate as either the downstream requirement,
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or the first configured pad, or a combination of both (when
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downstream specifies a range or a set of acceptable rates).
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Functions
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gst_audio_aggregator_set_sink_caps ()
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void
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gst_audio_aggregator_set_sink_caps (GstAudioAggregator *aagg,
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GstAudioAggregatorPad *pad,
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GstCaps *caps);
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Types and Values
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struct GstAudioAggregator
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struct GstAudioAggregator;
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GstAudioAggregator object
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Members
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struct GstAudioAggregatorClass
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struct GstAudioAggregatorClass {
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GstAggregatorClass parent_class;
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GstBuffer * (* create_output_buffer) (GstAudioAggregator * aagg,
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guint num_frames);
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gboolean (* aggregate_one_buffer) (GstAudioAggregator * aagg,
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GstAudioAggregatorPad * pad, GstBuffer * inbuf, guint in_offset,
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GstBuffer * outbuf, guint out_offset, guint num_frames);
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};
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create_output_buffer ()
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Create a new output buffer contains num_frames frames.
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aggregate_one_buffer ()
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Aggregates one input buffer to the output
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buffer. The in_offset and out_offset are in "frames", which is
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the size of a sample times the number of channels. Returns TRUE if
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any non-silence was added to the buffer
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struct GstAudioAggregatorPad
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struct GstAudioAggregatorPad;
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The default implementation of GstPad used with GstAudioAggregator
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Members
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struct GstAudioAggregatorPadClass
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struct GstAudioAggregatorPadClass {
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GstAggregatorPadClass parent_class;
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GstBuffer * (* convert_buffer) (GstAudioAggregatorPad * pad,
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GstAudioInfo *in_info,
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GstAudioInfo *out_info,
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GstBuffer * buffer);
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void (* update_conversion_info) (GstAudioAggregatorPad *pad);
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};
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Members
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convert_buffer ()
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Convert a buffer from one format to another.
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update_conversion_info ()
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Called when either the input or output
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formats have changed.
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struct GstAudioAggregatorConvertPad
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struct GstAudioAggregatorConvertPad;
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An implementation of GstPad that can be used with GstAudioAggregator.
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See GstAudioAggregator for more details.
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Members
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struct GstAudioAggregatorConvertPadClass
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struct GstAudioAggregatorConvertPadClass {
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GstAudioAggregatorPadClass parent_class;
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};
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Property Details
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The “alignment-threshold” property
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“alignment-threshold” guint64
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Timestamp alignment threshold in nanoseconds.
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Flags: Read / Write
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Allowed values: <= 18446744073709551614
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Default value: 40000000
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The “discont-wait” property
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“discont-wait” guint64
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Window of time in nanoseconds to wait before creating a discontinuity.
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Flags: Read / Write
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Allowed values: <= 18446744073709551614
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Default value: 1000000000
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The “output-buffer-duration” property
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“output-buffer-duration” guint64
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Output block size in nanoseconds.
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Flags: Read / Write
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Allowed values: >= 1
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Default value: 10000000
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The “converter-config” property
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“converter-config” GstStructure *
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A GstStructure describing the configuration that should be used when converting this pad's audio buffers.
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Flags: Read / Write
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See Also
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GstAggregator, GstAudioMixer
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Generated by GTK-Doc V1.27
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</body>
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</html>
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