WIP: Live mixing support.
checkpoint: StreamingAsset Loader.
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using System;
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using UnityEngine;
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using Object = UnityEngine.Object;
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#if UNITY_STANDALONE || UNITY_EDITOR
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using System.Collections;
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using System.IO;
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using UnityEngine.Networking;
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#endif
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namespace OCES
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{
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#if UNITY_STANDALONE || UNITY_EDITOR
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/// <summary>
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/// 从 StreamingAssets 加载资源的 IAssetProvider 实现。
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/// 仅支持桌面平台（Windows / macOS / Linux）及 Editor。
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/// 无内置缓存——每次调用都从磁盘读取，缓存由上层 ResourceLoader 负责。
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/// 目前仅支持 AudioClip（.wav 格式）。
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/// </summary>
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public class StreamingAssetProvider : IAssetProvider
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{
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public T Load<T>(string path) where T : Object
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{
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if (typeof(T) != typeof(AudioClip))
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{
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Debug.LogError($"[StreamingAssetProvider] Load<{typeof(T).Name}> 不支持，仅支持 AudioClip");
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return null;
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}
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string fullPath = Path.Combine(Application.streamingAssetsPath, path);
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if (!File.Exists(fullPath))
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{
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Debug.LogError($"[StreamingAssetProvider] 文件 {fullPath} 不存在。");
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return null;
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}
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byte[] wavBytes = File.ReadAllBytes(fullPath);
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AudioClip clip = ParseWav(wavBytes, Path.GetFileNameWithoutExtension(path));
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return clip as T;
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}
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public void LoadAsync<T>(string path, MonoBehaviour coroutineHost, Action<T> onComplete) where T : Object
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{
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coroutineHost.StartCoroutine(LoadAsyncCoroutine(path, onComplete));
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}
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IEnumerator LoadAsyncCoroutine<T>(string path, Action<T> onComplete) where T : Object
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{
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if (typeof(T) != typeof(AudioClip))
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{
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Debug.LogError($"[StreamingAssetProvider] LoadAsync<{typeof(T).Name}> 不支持，仅支持 AudioClip");
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onComplete?.Invoke(null);
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yield break;
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}
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string fullPath = Path.Combine(Application.streamingAssetsPath, path);
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string url = "file://" + fullPath;
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using UnityWebRequest request = UnityWebRequestMultimedia.GetAudioClip(url, AudioType.WAV);
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yield return request.SendWebRequest();
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if (request.result == UnityWebRequest.Result.Success)
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{
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AudioClip clip = DownloadHandlerAudioClip.GetContent(request);
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onComplete?.Invoke(clip as T);
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}
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else
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{
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Debug.LogError($"[StreamingAssetProvider] 加载失败: {url}, 错误: {request.error}");
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onComplete?.Invoke(null);
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}
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}
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// ─────────────────────────────────────────────
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// WAV 解析（PCM 16-bit / 8-bit，单声道 / 立体声）
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// ─────────────────────────────────────────────
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static AudioClip ParseWav(byte[] wavBytes, string clipName)
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{
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int position = 0;
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// RIFF header
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if (wavBytes.Length < 44 ||
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wavBytes[0] != 'R' || wavBytes[1] != 'I' || wavBytes[2] != 'F' || wavBytes[3] != 'F')
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{
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Debug.LogError("[StreamingAssetProvider] 无效的 WAV 文件：缺少 RIFF 头");
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return null;
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}
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position += 4; // "RIFF"
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position += 4; // file size (unused)
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if (wavBytes[8] != 'W' || wavBytes[9] != 'A' || wavBytes[10] != 'V' || wavBytes[11] != 'E')
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{
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Debug.LogError("[StreamingAssetProvider] 无效的 WAV 文件：缺少 WAVE 标识");
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return null;
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}
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position += 4; // "WAVE"
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int channels = 1;
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int sampleRate = 44100;
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int bitsPerSample = 16;
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byte[] pcmData = null;
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// 遍历 chunk
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while (position < wavBytes.Length - 8)
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{
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string chunkId = System.Text.Encoding.ASCII.GetString(wavBytes, position, 4);
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position += 4;
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int chunkSize = BitConverter.ToInt32(wavBytes, position);
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position += 4;
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if (chunkId == "fmt ")
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{
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int audioFormat = BitConverter.ToInt16(wavBytes, position);
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if (audioFormat != 1) // PCM = 1
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{
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Debug.LogError($"[StreamingAssetProvider] 不支持的音频格式: {audioFormat}，仅支持 PCM");
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return null;
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}
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channels = BitConverter.ToInt16(wavBytes, position + 2);
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sampleRate = BitConverter.ToInt32(wavBytes, position + 4);
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bitsPerSample = BitConverter.ToInt16(wavBytes, position + 14);
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if (channels < 1 || channels > 2)
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{
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Debug.LogError($"[StreamingAssetProvider] 不支持的声道数: {channels}");
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return null;
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}
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}
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else if (chunkId == "data")
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{
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pcmData = new byte[chunkSize];
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Array.Copy(wavBytes, position, pcmData, 0, chunkSize);
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}
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position += chunkSize;
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}
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if (pcmData == null || pcmData.Length == 0)
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{
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Debug.LogError("[StreamingAssetProvider] WAV 文件中未找到 data chunk");
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return null;
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}
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// PCM → float 样本
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int sampleCount = pcmData.Length / (bitsPerSample / 8);
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float[] samples = new float[sampleCount];
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if (bitsPerSample == 16)
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{
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for (int i = 0; i < sampleCount; i++)
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{
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short sample = BitConverter.ToInt16(pcmData, i * 2);
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samples[i] = sample / 32768f;
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}
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}
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else if (bitsPerSample == 8)
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{
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for (int i = 0; i < sampleCount; i++)
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{
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samples[i] = (pcmData[i] - 128f) / 128f;
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}
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}
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else
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{
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Debug.LogError($"[StreamingAssetProvider] 不支持的位深度: {bitsPerSample}");
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return null;
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}
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AudioClip clip = AudioClip.Create(clipName, sampleCount / channels, channels, sampleRate, false);
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clip.SetData(samples, 0);
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return clip;
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}
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}
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#else
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/// <summary>
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/// 非桌面平台的桩实现——StreamingAssetProvider 仅支持桌面平台。
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/// </summary>
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public class StreamingAssetProvider : IAssetProvider
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{
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public T Load<T>(string path) where T : Object
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{
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Debug.LogError("[StreamingAssetProvider] 仅支持桌面平台 (Windows/macOS/Linux)");
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return null;
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}
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public void LoadAsync<T>(string path, MonoBehaviour coroutineHost, Action<T> onComplete) where T : Object
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{
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Debug.LogError("[StreamingAssetProvider] 仅支持桌面平台 (Windows/macOS/Linux)");
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onComplete?.Invoke(null);
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}
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}
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#endif
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}
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