GStreamer Base Plugins 1.0 Plugins Reference Manual: adder

## adder adder — Add N audio channels together |

## Properties

GstCaps * | caps | Read / Write

## Types and Values

struct | GstAdder

## Object Hierarchy

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

## Implemented Interfaces

GstAdder implements GstChildProxy.

## Description

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.

### Example launch line

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

This pipeline produces two sine waves mixed together.

## Synopsis

### Element Information

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

### Element Pads

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 }

## Functions

## Types and Values

### struct GstAdder

    struct GstAdder;

The adder object structure.

## Property Details

### The `“caps”` property

      “caps”                     GstCaps *

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

Flags: Read / Write