# Save a recorded sound to .wav

**URL:** <https://qa.fmod.com/t/save-a-recorded-sound-to-wav/19068>\
**Category:** Unity\
**Tags:** unity, csharp\
**Created:** [July 29, 2022, 9:16am UTC](https://qa.fmod.com/t/save-a-recorded-sound-to-wav/19068 "2022-07-29T09:16:57Z")\
**Posts on this page:** 1\
**Showing post:** 3

<div class="post-metadata">

**Author:** ![jeff\_fmod](https://yyz2.discourse-cdn.com/flex036/user_avatar/qa.fmod.com/jeff_fmod/32/1766_2.png) [@jeff\_fmod](https://qa.fmod.com/u/jeff_fmod)\
**Post date:** [August 19, 2022, 1:46am UTC](https://qa.fmod.com/t/save-a-recorded-sound-to-wav/19068/3 "2022-08-19T01:46:36Z")

</div>

Apologies for the delay, we somehow missed this post.The C++ example you’ve linked to is probably a little more low-level than you need- that is for manually creating a wav file whereas you can just use the `WAVWRITER` output type in a separate system object.  
We had a [similar question](https://qa.fmod.com/t/general-advice-on-user-friendly-process-for-players-to-upload-audio-assets-then-pipe-them-through-fmod-powered-unity/19005/6) recently where @Connor_FMOD provided a solution in Unity using two system objects; one to record mic input and one to output the wav file. Here is that example again, pared back a bit more just to have the basics of starting and stopping a recording. Use “R” to start the recording and “S” to stop, at which point a file called “fmodoutput.wav” will appear in the root of your Unity project.

> **RecordMicOutputWav.cs**
>
> ```auto
> using System.Collections.Generic;
> using System.Runtime.CompilerServices;
> using System.Runtime.InteropServices;
> using UnityEngine;
> using FMOD;
> 
> public class RecordMicOutputWav : MonoBehaviour
> {
> public float Latency = 0.2f;
> public int RecordingDeviceIndex = 0;
> public string RecordingDeviceName = null;
> public List<string> ConnectedDevices = new List<string>();
> 
> private Sound sound;
> private CREATESOUNDEXINFO exinfo;
> private Channel channel;
> private Channel wavChannel;
> private ChannelGroup channelGroup;
> 
> private FMOD.System micRecordSystem, wavWriterSystem;
> private bool recording = false;
> private int SampleRate = 0;
> private int NumChannels = 0;
> 
> private float time = 0.0f;
> 
> private void Start()
> {
> ERRCHECK( Factory.System_Create(out micRecordSystem) );
> ERRCHECK( Factory.System_Create(out wavWriterSystem) );
> 
> ERRCHECK( micRecordSystem.init(100, INITFLAGS.NORMAL, System.IntPtr.Zero) );
> ERRCHECK( wavWriterSystem.init(100, INITFLAGS.NORMAL, System.IntPtr.Zero) );
> 
> ERRCHECK( wavWriterSystem.setOutput(OUTPUTTYPE.NOSOUND) );
> 
> InitRecordingDevices();
> InitExInfo();
> }
> 
> private void OnDestroy()
> {
> if(recording)
> {
> StopRecording();
> }
> 
> ERRCHECK( micRecordSystem.release() );
> ERRCHECK( wavWriterSystem.release() );
> }
> 
> private void Update()
> { 
> if (recording)
> {
> time += Time.deltaTime;
> if (time >= Latency)
> {
> ERRCHECK( micRecordSystem.update() );
> ERRCHECK( wavWriterSystem.update() );
> }
> }
> 
> if (Input.GetKeyDown(KeyCode.R))
> {
> StartRecording();
> }
> 
> if (Input.GetKeyDown(KeyCode.S))
> {
> StopRecording();
> }
> }
> 
> private void StartRecording()
> {
> recording = true;
> 
> ERRCHECK( micRecordSystem.createSound(exinfo.userdata, MODE.LOOP_NORMAL | MODE.OPENUSER, ref exinfo, out sound) );
> 
> ERRCHECK( micRecordSystem.recordStart(RecordingDeviceIndex, sound, true) );
> ERRCHECK( wavWriterSystem.setOutput(OUTPUTTYPE.WAVWRITER) );
> 
> ERRCHECK( micRecordSystem.playSound(sound, channelGroup, false, out channel) );
> ERRCHECK( wavWriterSystem.playSound(sound, channelGroup, false, out wavChannel) );
> }
> 
> private void StopRecording()
> {
> recording = false;
> time = 0.0f;
> 
> ERRCHECK( micRecordSystem.recordStop(RecordingDeviceIndex) );
> 
> ERRCHECK( wavChannel.stop() );
> ERRCHECK( channel.stop() );
> ERRCHECK( sound.release() );
> 
> ERRCHECK( wavWriterSystem.setOutput(OUTPUTTYPE.NOSOUND) );
> }
> 
> private void InitExInfo()
> {
> exinfo.cbsize = Marshal.SizeOf(typeof(CREATESOUNDEXINFO));
> exinfo.numchannels = NumChannels;
> exinfo.format = SOUND_FORMAT.PCM16;
> exinfo.defaultfrequency = SampleRate;
> exinfo.length = (uint)SampleRate * sizeof(short) * (uint)NumChannels;
> }
> 
> private void InitRecordingDevices()
> {
> ERRCHECK( micRecordSystem.getRecordNumDrivers(out int numdDrivers, out _) );
> 
> for (int i = 0; i < numdDrivers; ++i)
> {
> ERRCHECK( micRecordSystem.getRecordDriverInfo(i, out string name, 64, out _, out int sampleRate, out _, out int numChannels, out _) );
> 
> ConnectedDevices.Add(name);
> 
> if (i == RecordingDeviceIndex)
> {
> RecordingDeviceName = name;
> SampleRate = sampleRate;
> NumChannels = numChannels;
> }
> }
> }
> 
> private void ERRCHECK(RESULT result, [CallerLineNumber] int lineNumber = 0, [CallerMemberName] string failed = null)
> {
> if (result != RESULT.OK)
> {
> UnityEngine.Debug.LogError(lineNumber + "(" + failed + "): " + Error.String(result));
> }
> }
> }
> 
> ```

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