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147 changes: 147 additions & 0 deletions
147
src/Desktop/RodelAgent.UI/Extensions/AudioFileReader.cs
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,147 @@ | ||
| // <auto-generated /> | ||
| using NAudio.Wave; | ||
| using NAudio.Wave.SampleProviders; | ||
|
|
||
| namespace RodelAgent.UI.Extensions; | ||
|
|
||
| /// <summary> | ||
| /// AudioFileReader simplifies opening an audio file in NAudio | ||
| /// Simply pass in the filename, and it will attempt to open the | ||
| /// file and set up a conversion path that turns into PCM IEEE float. | ||
| /// ACM codecs will be used for conversion. | ||
| /// It provides a volume property and implements both WaveStream and | ||
| /// ISampleProvider, making it possibly the only stage in your audio | ||
| /// pipeline necessary for simple playback scenarios | ||
| /// </summary> | ||
| public class AudioFileReader : WaveStream, ISampleProvider | ||
| { | ||
| private WaveStream readerStream; // the waveStream which we will use for all positioning | ||
| private readonly SampleChannel sampleChannel; // sample provider that gives us most stuff we need | ||
| private readonly int destBytesPerSample; | ||
| private readonly int sourceBytesPerSample; | ||
| private readonly long length; | ||
| private readonly object lockObject; | ||
|
|
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| /// <summary> | ||
| /// Initializes a new instance of AudioFileReader | ||
| /// </summary> | ||
| /// <param name="fileName">The file to open</param> | ||
| public AudioFileReader(string fileName) | ||
| { | ||
| lockObject = new object(); | ||
| FileName = fileName; | ||
| CreateReaderStream(fileName); | ||
| sourceBytesPerSample = (readerStream.WaveFormat.BitsPerSample / 8) * readerStream.WaveFormat.Channels; | ||
| sampleChannel = new SampleChannel(readerStream, false); | ||
| destBytesPerSample = 4 * sampleChannel.WaveFormat.Channels; | ||
| length = SourceToDest(readerStream.Length); | ||
| } | ||
|
|
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| /// <summary> | ||
| /// Creates the reader stream, supporting all filetypes in the core NAudio library, | ||
| /// and ensuring we are in PCM format | ||
| /// </summary> | ||
| /// <param name="fileName">File Name</param> | ||
| private void CreateReaderStream(string fileName) | ||
| { | ||
| if (fileName.EndsWith(".wav", StringComparison.OrdinalIgnoreCase)) | ||
| { | ||
| readerStream = new WaveFileReader(fileName); | ||
| } | ||
| } | ||
| /// <summary> | ||
| /// File Name | ||
| /// </summary> | ||
| public string FileName { get; } | ||
|
|
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| /// <summary> | ||
| /// WaveFormat of this stream | ||
| /// </summary> | ||
| public override WaveFormat WaveFormat => sampleChannel.WaveFormat; | ||
|
|
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| /// <summary> | ||
| /// Length of this stream (in bytes) | ||
| /// </summary> | ||
| public override long Length => length; | ||
|
|
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| /// <summary> | ||
| /// Position of this stream (in bytes) | ||
| /// </summary> | ||
| public override long Position | ||
| { | ||
| get { return SourceToDest(readerStream.Position); } | ||
| set { lock (lockObject) { readerStream.Position = DestToSource(value); } } | ||
| } | ||
|
|
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| /// <summary> | ||
| /// Reads from this wave stream | ||
| /// </summary> | ||
| /// <param name="buffer">Audio buffer</param> | ||
| /// <param name="offset">Offset into buffer</param> | ||
| /// <param name="count">Number of bytes required</param> | ||
| /// <returns>Number of bytes read</returns> | ||
| public override int Read(byte[] buffer, int offset, int count) | ||
| { | ||
| var waveBuffer = new WaveBuffer(buffer); | ||
| int samplesRequired = count / 4; | ||
| int samplesRead = Read(waveBuffer.FloatBuffer, offset / 4, samplesRequired); | ||
| return samplesRead * 4; | ||
| } | ||
|
|
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| /// <summary> | ||
| /// Reads audio from this sample provider | ||
| /// </summary> | ||
| /// <param name="buffer">Sample buffer</param> | ||
| /// <param name="offset">Offset into sample buffer</param> | ||
| /// <param name="count">Number of samples required</param> | ||
| /// <returns>Number of samples read</returns> | ||
| public int Read(float[] buffer, int offset, int count) | ||
| { | ||
| lock (lockObject) | ||
| { | ||
| return sampleChannel.Read(buffer, offset, count); | ||
| } | ||
| } | ||
|
|
||
| /// <summary> | ||
| /// Gets or Sets the Volume of this AudioFileReader. 1.0f is full volume | ||
| /// </summary> | ||
| public float Volume | ||
| { | ||
| get { return sampleChannel.Volume; } | ||
| set { sampleChannel.Volume = value; } | ||
| } | ||
|
|
||
| /// <summary> | ||
| /// Helper to convert source to dest bytes | ||
| /// </summary> | ||
| private long SourceToDest(long sourceBytes) | ||
| { | ||
| return destBytesPerSample * (sourceBytes / sourceBytesPerSample); | ||
| } | ||
|
|
||
| /// <summary> | ||
| /// Helper to convert dest to source bytes | ||
| /// </summary> | ||
| private long DestToSource(long destBytes) | ||
| { | ||
| return sourceBytesPerSample * (destBytes / destBytesPerSample); | ||
| } | ||
|
|
||
| /// <summary> | ||
| /// Disposes this AudioFileReader | ||
| /// </summary> | ||
| /// <param name="disposing">True if called from Dispose</param> | ||
| protected override void Dispose(bool disposing) | ||
| { | ||
| if (disposing) | ||
| { | ||
| if (readerStream != null) | ||
| { | ||
| readerStream.Dispose(); | ||
| readerStream = null; | ||
| } | ||
| } | ||
| base.Dispose(disposing); | ||
| } | ||
| } |
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