Initial commit

lib/config/audio-config.ts

@@ -0,0 +1,75 @@
+// 音频配置管理 - 简化版
+export interface AudioFormat {
+  mimeType: string;
+  extension: string;
+  codec: string;
+  quality: "low" | "medium" | "high" | "lossless";
+  maxBitrate: number;
+}
+
+// 支持的音频格式配置
+export const SUPPORTED_AUDIO_FORMATS: Record<string, AudioFormat> = {
+  webm: {
+    mimeType: "audio/webm;codecs=opus",
+    extension: ".webm",
+    codec: "opus",
+    quality: "high",
+    maxBitrate: 128000,
+  },
+  ogg: {
+    mimeType: "audio/ogg;codecs=opus",
+    extension: ".ogg",
+    codec: "opus",
+    quality: "high",
+    maxBitrate: 192000,
+  },
+  aac: {
+    mimeType: "audio/aac",
+    extension: ".aac",
+    codec: "aac",
+    quality: "high",
+    maxBitrate: 256000,
+  },
+};
+
+// 获取浏览器支持的音频格式
+export function getSupportedFormats(): AudioFormat[] {
+  const supported: AudioFormat[] = [];
+
+  // 检查 WebM 支持
+  if (MediaRecorder.isTypeSupported("audio/webm;codecs=opus")) {
+    supported.push(SUPPORTED_AUDIO_FORMATS.webm);
+  }
+
+  // 检查 OGG 支持
+  if (MediaRecorder.isTypeSupported("audio/ogg;codecs=opus")) {
+    supported.push(SUPPORTED_AUDIO_FORMATS.ogg);
+  }
+
+  // 检查 AAC 支持
+  if (MediaRecorder.isTypeSupported("audio/aac")) {
+    supported.push(SUPPORTED_AUDIO_FORMATS.aac);
+  }
+
+  // 如果没有支持的格式，至少返回 WebM
+  if (supported.length === 0) {
+    supported.push(SUPPORTED_AUDIO_FORMATS.webm);
+  }
+
+  return supported;
+}
+
+// 获取最佳录音格式
+export function getBestRecordingFormat(): AudioFormat {
+  const supported = getSupportedFormats();
+  return supported[0] || SUPPORTED_AUDIO_FORMATS.webm;
+}
+
+// 格式化文件大小
+export function formatFileSize(bytes: number): string {
+  if (bytes === 0) return "0 B";
+  const k = 1024;
+  const sizes = ["B", "KB", "MB", "GB"];
+  const i = Math.floor(Math.log(bytes) / Math.log(k));
+  return parseFloat((bytes / Math.pow(k, i)).toFixed(2)) + " " + sizes[i];
+}