CODEWITHSUNDEEP
audiowindows-runtimeuwp
Ceshion
Ceshion

Reputation: 706

AudioGraph.CreateFileInputNodeAsync resulting in FormatNotSupported with wav and AudioNodeEmitter

I'm trying out the new spatial audio functions in the AudioGraph 1.1 API and I have sound output from a file working without an emitter, but when I add an emitter to my node creation call it suddenly returns FormatNotSupported. I can't find any information via searching that has been any sort of helpful, probably because it's such a new API. Can anyone see if I'm doing something wrong or missing something? Following is my code:

private async void MainPage_Loaded(object sender, RoutedEventArgs args)
        {
            AudioGraphSettings settings = new AudioGraphSettings(AudioRenderCategory.Media);
            var devices = await DeviceInformation.FindAllAsync();
            CreateAudioGraphResult result = await AudioGraph.CreateAsync(settings);
            if (result.Status != AudioGraphCreationStatus.Success)
            {
                return;
            }
            graph = result.Graph;

            FileOpenPicker saveFilePicker = new FileOpenPicker();
            saveFilePicker.FileTypeFilter.Add(".wav");
            saveFilePicker.FileTypeFilter.Add(".wma");
            saveFilePicker.FileTypeFilter.Add(".mp3");
            StorageFile file = await saveFilePicker.PickSingleFileAsync();

            if (file == null)
            {
                return;
            }

            AudioNodeEmitter emitter = new AudioNodeEmitter(AudioNodeEmitterShape.CreateOmnidirectional(),
                AudioNodeEmitterDecayModel.CreateNatural(.1,1,10,100),
                AudioNodeEmitterSettings.None);
            emitter.Position = new Vector3(10, 0, 5);

            CreateAudioDeviceOutputNodeResult deviceOutputNodeResult = await graph.CreateDeviceOutputNodeAsync();
            var outputNode = deviceOutputNodeResult.DeviceOutputNode;

            CreateAudioFileInputNodeResult fileInputNodeResult = await graph.CreateFileInputNodeAsync(file, emitter);
            inputNode = fileInputNodeResult.FileInputNode;

            inputNode.AddOutgoingConnection(outputNode);
            graph.Start();
        }

Upvotes: 1

Views: 221

Answers (1)

Grace Feng
Grace Feng

Reputation: 16652

There is no problem with your code, problem is:

Audio node emitters can only process audio that is formatted in mono with a sample rate of 48kHz. Attempting to use stereo audio or audio with a different sample rate will result in an exception.

You can refer to the note part of Spatial audio.

To test this API, you may download this audio here.

Upvotes: 1

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