Tag: unity

I work on a custom ScriptedImporter – Let's call it LmmsImporter – the project files from LMMS sequencer loads as Audio clips. I do not analyze the project file. Instead, I expect users to install LMMS, configure the location, and then save their project files in their files financial assets Directory. After the asset settings have been configured, the import process looks like this:

1. Create command-line arguments based on the properties offered by LmmsImporter
2. Get a temporary path within the project Temp Directory (not the equivalent of the operating system)
3. Start an LMMS process that renders the imported project file with the arguments specified by (1) to the path specified by (2).
4. Wait for the process to complete.
5. Download the Audio clip to "runtime" (that is, in an editor script, not as an imported asset) with UnityWebRequestMultimedia.GetAudioClip
6. Clone the Audio clip,
7. Put the cloned one Audio clip Main object of the LMMS project asset as described here.
8. Save the imported asset and delete the original audio file created with (3).

Everything up to and including step 7 works as expected. In fact, even step 7 appear work as expected. But when I open the imported Audio clipIt has no samples. When I try to play the preview in the editor, the editor console displays the following error:

Error: FMOD :: Sound instance for resource can not be created (error loading file).
UnityEngine.GUIUtility: ProcessEvent (Int32, IntPtr)

What makes this strange is that:

• The sound is rendered correctly by LMMS and stored in the file system. Nothing unusual happens here.
• The playing Audio clip within the importer script immediately after it is loaded (ie still in OnImportAsset) With AudioSource.PlayAtPoint works as expected.
• The data is cloned properly. I checked if the arrays are the same.
• I do not receive any errors or exceptions except those I have already described, not even LMMS.

This is an excerpt from my code with the parts that I find the most relevant:

using system;
using System.Diagnostics;
using System.IO;
with UnityEngine;
Using UnityEngine.Networking;
with UnityEditor;
using UnityEditor.Experimental.AssetImporters;

[ScriptedImporter(1, new[] {"mmp", "mmpz"})]public class LmmsImporter: ScriptedImporter
{
// Properties omitted for the sake of brevity

public override void OnImportAsset (AssetImportContext ctx)
{
var relativeTempPath = FileUtil.GetUniqueTempPathInProject ();
var projectDir = Path.GetDirectoryName (Application.dataPath);
var absoluteAssetPath = Path.Combine (projectDir, assetPath);
var tempPath = Path.Combine (projectDir, relativeTempPath);

To attempt
{
using (Process lmms = new Process ())
{
// Call details and error handling are omitted for the sake of brevity
// ... a WAV, OGG or MP3 file was later successfully rendered ...

using (var request = UnityWebRequestMultimedia.GetAudioClip (new Uri (tempPath), audioFormat))
{
var handler = request.downloadHandler as DownloadHandlerAudioClip;
handler.compressed = false;
handler.streamAudio = false;
request.timeout = LOAD_MEDIA_TIMEOUT;

var operation = request.SendWebRequest ();

while (! (request.isHttpError || request.isNetworkError || handler.isDone));
// Let the request finish, unless we get an error (possibly including a timeout)

var clip = DownloadHandlerAudioClip.GetContent (request);

clip.LoadAudioData ();

var assetName = Path.GetFileNameWithoutExtension (assetPath);
var clone = AudioClip.Create ("Clip", clip.samples, clip.channels, clip.frequency, false);

using (var so = new SerializedObject (clone))
{
var samples = new floats[clip.samples * clip.channels];

clip.GetData (samples, 0);
clone.SetData (samples, 0);

// Everything about this line works fine

ctx.AddObjectToAsset ("AudioClip", clone);
ctx.SetMainObject (clone);

so.ApplyModifiedProperties ();

EditorUtility.SetDirty (clone);
}
}
}
}
catch (exception e)
{
ctx.LogImportError ($ "Error importing with {e.GetType ()}: {e.Message}");
}
}
private const int LOAD_MEDIA_TIMEOUT = 5; // seconds
}

I am using Unity 2019.1.7f1 staff under Ubuntu 19.04. Is this a mistake or am I doing something wrong?