whisper_flutter_new/example/lib/whisper_audio_convert.dart

import "dart:async";
import "dart:io";

import "package:ffmpeg_kit_flutter_full_gpl/ffmpeg_kit.dart";
import "package:ffmpeg_kit_flutter_full_gpl/ffmpeg_session.dart";
import "package:ffmpeg_kit_flutter_full_gpl/return_code.dart";
import "package:flutter/foundation.dart";

/// Class used to convert any audio file to wav
class WhisperAudioconvert {
  const WhisperAudioconvert({
    required this.audioInput,
    required this.audioOutput,
  });

  /// Input audio file
  final File audioInput;

  /// Output audio file
  final File audioOutput;

  /// convert [audioInput] to wav file
  Future<File?> convert() async {
    final FFmpegSession session = await FFmpegKit.execute(
      [
        "-y",
        "-i",
        audioInput.path,
        "-ar",
        "16000",
        "-ac",
        "1",
        "-c:a",
        "pcm_s16le",
        audioOutput.path,
      ].join(" "),
    );

    final ReturnCode? returnCode = await session.getReturnCode();

    if (ReturnCode.isSuccess(returnCode)) {
      return audioOutput;
    } else if (ReturnCode.isCancel(returnCode)) {
      if (kDebugMode) {
        debugPrint("[Whisper]File convertion canceled");
      }
    } else {
      if (kDebugMode) {
        debugPrint(
          "[Whisper]File convertion error with returnCode ${returnCode?.getValue()}",
        );
      }
    }

    return null;
  }
}