88 lines
2.5 KiB
C#
88 lines
2.5 KiB
C#
using System;
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using System.Collections.Generic;
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using System.IO;
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using Godot;
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using NAudio.Wave;
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namespace AudioEditor;
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public partial class AudioFileAnalyzer : Node
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{
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public static AudioFileAnalyzer Instance { get; private set; }
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public override void _Ready()
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{
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base._Ready();
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Instance = this;
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}
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public void AnalyzeFile(string path, out WaveformInfo waveformInfo)
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{
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waveformInfo = new();
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if (_waveformInfoCache.ContainsKey(path))
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{
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waveformInfo = _waveformInfoCache[path];
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return;
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}
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var ext = Path.GetExtension(path);
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switch (ext)
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{
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case ".wav":
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GD.Print("Analyzing a WAV file...");
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AnalyzeWav(path, out waveformInfo);
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break;
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default:
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GD.Print($"Format {ext} is not supported!");
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break;
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}
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_waveformInfoCache.Add(path, waveformInfo);
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}
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public bool TryGetFromCache(string path, out WaveformInfo waveformInfo)
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{
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return _waveformInfoCache.TryGetValue(path, out waveformInfo);
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}
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private void AnalyzeWav(string path, out WaveformInfo waveformInfo)
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{
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waveformInfo = new WaveformInfo();
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using (var reader = new WaveFileReader(path))
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{
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waveformInfo.Length = reader.TotalTime;
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waveformInfo.SampleRate = reader.WaveFormat.SampleRate;
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long sampleCount = reader.Length / reader.WaveFormat.BlockAlign;
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waveformInfo.Samples = new float[sampleCount];
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// Render the waveform
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byte[] buffer = new byte[reader.WaveFormat.BlockAlign];
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for (int i = 0; i < sampleCount; i++)
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{
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int sampleIndex = i * reader.WaveFormat.BlockAlign;
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while (reader.Position < reader.Length)
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{
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// Read the raw bytes for the current sample
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reader.Read(buffer, 0, buffer.Length);
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// Convert the byte array to a 16-bit sample (assuming 16-bit PCM)
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short sample = BitConverter.ToInt16(buffer, 0); // Assuming 16-bit signed samples
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waveformInfo.Samples[sampleIndex++] = (float)sample / short.MaxValue;
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}
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}
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}
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}
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private Dictionary<string, WaveformInfo> _waveformInfoCache = new();
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}
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public class WaveformInfo
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{
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public int SampleRate { get; set; }
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public TimeSpan Length { get; set; }
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public float[] Samples { get; set; }
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} |