GStreamer Base Plugins 1.0 Plugins Reference Manual: adder

adder

adder — Add N audio channels together

Read / Write

struct

    GObject
    ╰── GInitiallyUnowned
        ╰── GstObject
            ╰── GstElement
                ╰── GstAdder

GstAdder implements GstChildProxy.

The adder allows to mix several streams into one by adding the data. Mixed data is clamped to the min/max values of the data format.

The adder currently mixes all data received on the sinkpads as soon as possible without trying to synchronize the streams.

1	gst-launch audiotestsrc freq=100 ! adder name=mix ! audioconvert ! alsasink audiotestsrc freq=500 ! mix.

This pipeline produces two sine waves mixed together.

plugin	adder
author	Thomas Vander Stichele <thomas at apestaart dot org>
class	Generic/Audio

name	sink_%u
direction	sink
presence	request
details	audio/x-raw, format=(string){ S32LE, U32LE, S16LE, U16LE, S8, U8, F32LE, F64LE }, rate=(int)[ 1, 2147483647 ], channels=(int)[ 1, 2147483647 ], layout=(string){ interleaved, non-interleaved }

name	src
direction	source
presence	always
details	audio/x-raw, format=(string){ S32LE, U32LE, S16LE, U16LE, S8, U8, F32LE, F64LE }, rate=(int)[ 1, 2147483647 ], channels=(int)[ 1, 2147483647 ], layout=(string){ interleaved, non-interleaved }

struct GstAdder;

The adder object structure.

  “caps”                     GstCaps *

Set target format for mixing (NULL means ANY). Setting this property takes a reference to the supplied GstCaps object.

Flags: Read / Write