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<title>adder: GStreamer Base Plugins 1.0 Plugins Reference Manual</title>
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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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Implemented Interfaces |
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Properties
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adder
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adder
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Properties
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GstCaps *
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caps
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Read / Write
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Types and Values
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struct
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GstAdder
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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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╰── GstAdder
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Implemented Interfaces
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GstAdder implements
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GstChildProxy.
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Description
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The adder allows to mix several streams into one by adding the data.
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Mixed data is clamped to the min/max values of the data format.
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The adder currently mixes all data received on the sinkpads as soon as
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possible without trying to synchronize the streams.
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Check out the audiomixer element in gst-plugins-bad for a better-behaving
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audio mixing element: It will sync input streams correctly and also handle
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live inputs properly.
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Caps negotiation is inherently racy with the adder element. You can set
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the "caps" property to force adder to operate in a specific audio
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format, sample rate and channel count. In this case you may also need
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audioconvert and/or audioresample elements for each input stream before the
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adder element to make sure the input branch can produce the forced format.
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Example launch line
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1
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gst-launch-1.0 audiotestsrc freq=100 ! adder name=mix ! audioconvert ! autoaudiosink audiotestsrc freq=500 ! mix.
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This pipeline produces two sine waves mixed together.
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Synopsis
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Element Information
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plugin
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adder
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author
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Thomas Vander Stichele <thomas at apestaart dot org>
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class
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Generic/Audio
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Element Pads
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name
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sink_%u
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direction
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sink
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presence
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request
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details
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audio/x-raw, format=(string){ S32LE, U32LE, S16LE, U16LE, S8, U8, F32LE, F64LE }, rate=(int)[ 1, 2147483647 ], channels=(int)[ 1, 2147483647 ], layout=(string){ interleaved }
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name
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src
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direction
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source
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presence
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always
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details
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audio/x-raw, format=(string){ S32LE, U32LE, S16LE, U16LE, S8, U8, F32LE, F64LE }, rate=(int)[ 1, 2147483647 ], channels=(int)[ 1, 2147483647 ], layout=(string){ interleaved }
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Functions
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Types and Values
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struct GstAdder
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struct GstAdder;
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The adder object structure.
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Property Details
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The “caps” property
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“caps” GstCaps *
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Set target format for mixing (NULL means ANY). Setting this property takes a reference to the supplied GstCaps object.
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Flags: Read / Write
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