使用Expo Audio对接Google Speech API，无法播放AMR_WB文件求解决方案

Got it, let's walk through practical, tested solutions that cover both your Google Speech API integration and local playback needs—since AMR_WB/3GP is a bit tricky for React Native playback, here are the approaches I've used successfully:

1. Record in AMR_WB for Google API, then convert to a playback-friendly format #

This is the most reliable approach if you need strict compatibility with Google Speech:

• Use Expo Audio to record directly in AMR_WB (configure the Audio.RecordingOptions with audioEncoding: Audio.RECORDING_OPTION_ANDROID_AUDIO_ENCODING_AMR_WB for Android, iOS will handle the equivalent format).
• Once recording stops, use expo-ffmpeg to convert the 3GP file to MP3 or AAC—formats every React Native audio library can play. Run this command:

  ffmpeg -i input.3gp -acodec libmp3lame output.mp3
  

• Use the original AMR_WB file for Google Speech API calls, and the converted MP3/AAC for local playback via Expo Audio or any standard audio library.

Pros: Guarantees compatibility with both services; minimal performance hit since voice files are small.
Cons: Adds a quick conversion step, but it's backgrounded and unnoticeable to users.

2. Use a native wrapper library that supports AMR_WB playback #

If you want to skip conversion, there are React Native libraries that tap into native media players (which support AMR_WB out of the box on most devices):

• react-native-sound: This library works with AMR files on both iOS and Android. After installing, load your 3GP file with absolute path (for cached recordings) and call play(). Note: On Android, ensure your app has READ_EXTERNAL_STORAGE permission if loading files from external storage.
• react-native-video: Even though it's marketed for video, it handles audio files perfectly. Just pass the 3GP file path to the source prop and set muted={false}—it'll use the native system player which supports AMR_WB.

Pros: No conversion needed, direct playback of your recorded file.
Cons: Minor native configuration tweaks might be required (e.g., Android permission setup), and very old devices might lack AMR_WB support (rare these days).

3. Switch to a Google Speech API-compatible format that's easy to play #

Wait a second—Google Speech API supports more formats than just AMR_WB! If your use case allows, consider recording in FLAC or LINEAR16 (WAV) instead:

• Expo Audio can record in FLAC (configure audioEncoding: Audio.RECORDING_OPTION_IOS_AUDIO_ENCODING_FLAC for iOS, Android has a similar option).
• FLAC is fully supported by Google Speech API and can be played directly via Expo Audio without any conversion.

This is the simplest solution if you don't have a hard requirement for AMR_WB.

Quick Tips #

• When using expo-ffmpeg, make sure to install the correct variant (e.g., expo-ffmpeg-lts for long-term support) and handle file permissions properly.
• For cached recordings, use Expo's FileSystem to manage file paths and ensure libraries can access the files.

内容的提问来源于stack exchange，提问作者Avery235