fix: voice input recording format + ASR logging

- Change recorder format from mp3 (8kHz) to aac (22kHz) for better
  whisper ASR accuracy
- Move recorder.onStop binding before recorder.stop() to prevent
  race condition (onStop may fire before handler is registered)
- Backend: add Logger, log ASR errors instead of silent catch {}
- Backend: change default extension from .mp3 to .aac

backend/src/modules/tts/tts.controller.ts

@@ -1,4 +1,4 @@
-import { Controller, Get, Post, Body, Param, Res, HttpException, HttpStatus, UseGuards, UploadedFile, UseInterceptors } from '@nestjs/common'
+import { Controller, Get, Post, Body, Param, Res, HttpException, HttpStatus, UseGuards, UploadedFile, UseInterceptors, Logger } from '@nestjs/common'
 import { FileInterceptor } from '@nestjs/platform-express'
 import { Response } from 'express'
 import * as fs from 'fs'
@@ -10,6 +10,7 @@ import { Public } from '../../common/decorators/public.decorator'
 
 @Controller('tts')
 export class TtsController {
+  private readonly logger = new Logger(TtsController.name)
   constructor(private ttsService: TtsService) {}
 
   @UseGuards(JwtAuthGuard)
@@ -42,7 +43,7 @@ export class TtsController {
     if (!file) throw new HttpException('请上传音频文件', HttpStatus.BAD_REQUEST)
     const uploadDir = '/tmp/asr_uploads'
     if (!fs.existsSync(uploadDir)) fs.mkdirSync(uploadDir, { recursive: true })
-    const ext = path.extname(file.originalname) || '.mp3'
+    const ext = file.originalname ? path.extname(file.originalname) || '.aac' : '.aac'
     const dest = path.join(uploadDir, file.filename + ext)
     fs.renameSync(file.path, dest)
     try {
@@ -63,7 +64,11 @@ export class TtsController {
       if (whisperResult && whisperResult.trim()) {
         return { text: whisperResult.trim() }
       }
-    } catch {}
+    } catch (e: any) {
+      this.logger.error(`ASR failed: ${e?.message || e}`)
+    }
+    // 清理临时文件
+    try { fs.unlinkSync(dest) } catch {}
     return { text: '' }
   }
 }

zhiyin-app/src/pages/interview/interview.vue

@@ -351,19 +351,7 @@ function startRecord() {
   isRecording.value = true
   recorder = uni.getRecorderManager()
   recorder.onStart(() => {})
-  recorder.onError(() => { isRecording.value = false })
+  recorder.onError(() => { isRecording.value = false; uni.showToast({ title: '录音失败', icon: 'none' }) })
-  recorder.start({ format: 'mp3' })
-  uni.vibrateShort({ type: 'medium' })
-  // #endif
-  // #ifndef MP-WEIXIN
-  uni.showToast({ title: '语音输入仅支持小程序', icon: 'none' })
-  // #endif
-}
-
-function stopRecord() {
-  if (!recorder || !isRecording.value) return
-  isRecording.value = false
-  recorder.stop()
   recorder.onStop(async (res) => {
     if (!res.tempFilePath) return
     const audioPath = res.tempFilePath
@@ -387,6 +375,18 @@ function stopRecord() {
     }
     uni.showToast({ title: '语音识别失败，请手动输入', icon: 'none' })
   })
+  recorder.start({ format: 'aac', sampleRate: 22050, numberOfChannels: 1, encodeBitRate: 16000 })
+  uni.vibrateShort({ type: 'medium' })
+  // #endif
+  // #ifndef MP-WEIXIN
+  uni.showToast({ title: '语音输入仅支持小程序', icon: 'none' })
+  // #endif
+}
+
+function stopRecord() {
+  if (!recorder || !isRecording.value) return
+  isRecording.value = false
+  recorder.stop()
 }
 </script>