---
name: "SDL_GetAudioStreamOutputChannelMap"
section: "3"
platform: "linux"
package: "libsdl3-doc"
version: "3.2.10+ds-1"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/SDL_GetAudioStreamOutputChannelMap"
---

# SDL\_GetAudioStreamOutputChannelMap(3)

Get the current output channel map of an audio stream.

## NAME

SDL\_GetAudioStreamOutputChannelMap - Get the current output channel map of an audio stream.

## HEADER FILE

Defined in SDL3/SDL\_audio.h

## SYNOPSIS

```
#include "SDL3/SDL.h"
```

**int \* SDL\_GetAudioStreamOutputChannelMap(SDL\_AudioStream \*stream, int \*count);**

## DESCRIPTION

Channel maps are optional; most things do not need them, instead passing data in the \[order that SDL expects\](CategoryAudio#channel-layouts).

Audio streams default to no remapping applied. This is represented by returning NULL, and does not signify an error.

## FUNCTION PARAMETERS

- *stream*

  the  **SDL\_AudioStream**\
    to query.

- *count*

  On output, set to number of channels in the map. Can be NULL.

## RETURN VALUE

Returns an array of the current channel mapping, with as many elements as the current output spec's channels, or NULL if default. This should be freed with  **SDL\_free** () when it is no longer needed.

## THREAD SAFETY

It is safe to call this function from any thread, as it holds a stream-specific mutex while running.

## AVAILABILITY

This function is available since SDL 3.2.0.

## SEE ALSO

**•**(3), [**SDL\_SetAudioStreamInputChannelMap**(3)](/SDL_SetAudioStreamInputChannelMap/3.md)