SHA256
56 lines
2.5 KiB
C#
56 lines
2.5 KiB
C#
using System;
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using System.Collections.Generic;
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using UnityEngine;
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namespace ADOFAIRenderer.Util.Audio.Clip;
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/// <summary>
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/// Copies a Unity <see cref="AudioClip"/> into memory for clips without a file on disk
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/// (built-in hit sounds from Resources, official/DLC level audio).
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/// <see cref="AudioClip.GetData(float[], int)"/> runs on the main thread only, so the whole clip is copied once on the main thread
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/// and the decoder thread reads the copy through a <see cref="MemoryPCMReader"/>.
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/// Streaming clips (<see cref="AudioClipLoadType.Streaming"/>) are rejected because GetData does not read them.
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/// Reference: https://docs.unity3d.com/ScriptReference/AudioClip.GetData.html
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/// </summary>
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internal static class UnityClipLoader
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{
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/// <summary>
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/// Copies <paramref name="clip"/> in blocks of <see cref="AudioClipSource.ChunkFloats"/> floats or less
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/// (FramesPerBlock = ChunkFloats / channels frames per GetData call). Main thread only.
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/// Block memory is counted in <paramref name="store"/> and released block by block as the decoder thread reads it.
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/// </summary>
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public static MemoryPCMReader Load(AudioClip clip, AudioClipStore store)
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{
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if (!clip) throw new ArgumentNullException(nameof(clip));
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if (clip.loadType == AudioClipLoadType.Streaming)
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throw new NotSupportedException($"AudioClip '{clip.name}' is a streaming clip; GetData cannot read it.");
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if (clip.loadState == AudioDataLoadState.Unloaded)
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clip.LoadAudioData();
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var channels = clip.channels;
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var totalFrames = (long)clip.samples;
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var framesPerBlock = AudioClipSource.ChunkFloats / channels;
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var blocks = new List<float[]>();
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try
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{
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for (long start = 0; start < totalFrames; start += framesPerBlock)
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{
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var frames = (int)Math.Min(framesPerBlock, totalFrames - start);
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var block = store.AllocateExactArray(frames * channels);
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blocks.Add(block);
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// GetData fills the whole array; the offset is in frames (samples per channel).
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if (!clip.GetData(block, (int)start))
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throw new InvalidOperationException($"AudioClip.GetData failed for '{clip.name}' at frame {start} (load state {clip.loadState}).");
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}
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}
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catch
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{
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foreach (var block in blocks) store.FreeExactArray(block);
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throw;
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}
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return new MemoryPCMReader(blocks, framesPerBlock, channels, clip.frequency, totalFrames, store.FreeExactArray);
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}
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}
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