112 lines
3.5 KiB
Dart
112 lines
3.5 KiB
Dart
import 'dart:async';
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import 'dart:ffi' as ffi;
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import 'dart:io';
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import 'dart:typed_data';
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import 'package:ffmpeg_kit_flutter/ffmpeg_kit.dart';
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import 'package:ffmpeg_kit_flutter/return_code.dart';
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import 'package:flutter/services.dart';
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import 'package:path_provider/path_provider.dart';
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class G711 {
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Future<List<int>> readAssetFile(String assetPath) async {
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ByteData data = await rootBundle.load(assetPath);
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List<int> bytes = data.buffer.asUint8List();
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return bytes;
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}
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int ALawToLinear(int aVal) {
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// 取反
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aVal = ~aVal;
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// 计算偏移
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int t = ((aVal & 0x0F) << 3) + 0x84;
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t <<= (aVal & 0x70) >> 4;
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// 根据符号位决定返回值的正负
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return (aVal & 0x80) != 0 ? 0x84 - t : t - 0x84;
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}
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List<int> convertList(List<int> aLawList) {
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// 将 ALawToLinear 函数应用于 List<int>
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List<int> linearList = aLawList.map(ALawToLinear).toList();
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return linearList;
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}
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Future<Uint8List?> decodeG711ToPCM(List<int> g711Data) async {
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// FlutterFFmpeg flutterFFmpeg = FlutterFFmpeg();
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// Save G.711 data to a temporary file
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Directory appDocDir = await getApplicationDocumentsDirectory();
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String g711FilePath = '${appDocDir.path}/input.g711';
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await File(g711FilePath).writeAsBytes(g711Data);
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// Replace with the desired output PCM file path
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String pcmFilePath = '${appDocDir.path}/output.pcm';
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// Run FFmpeg command to decode G.711 to PCM
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// String command =
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// '-y -f u8 -ar 8000 -ac 1 -i $g711FilePath -f s16le -ar 8000 -ac 1 $pcmFilePath';
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try {
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final session = await FFmpegKit.execute(
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'-y -f u8 -ar 8000 -ac 1 -i $g711FilePath -f s16le -ar 8000 -ac 1 $pcmFilePath',
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);
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final returnCode = await session.getReturnCode();
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if (ReturnCode.isSuccess(returnCode)) {
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Uint8List pcmBytes = await File(pcmFilePath).readAsBytes();
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return pcmBytes;
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} else {
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print('FFmpeg execution failed with rc=$returnCode');
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// 处理执行失败的情况
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}
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} catch (e) {
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print('Error executing FFmpeg command: $e');
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// 处理异常情况
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}
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return null;
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}
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// Future<Uint8List?> encodePCMToG711(Uint8List pcmData) async {
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// try {
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// // FlutterFFmpeg flutterFFmpeg = FlutterFFmpeg();
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// // Save PCM data to a temporary file
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// Directory appDocDir = await getApplicationDocumentsDirectory();
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// String pcmFilePath = '${appDocDir.path}/input.pcm';
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// await File(pcmFilePath).writeAsBytes(pcmData);
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// // Replace with the desired output G.711 file path
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// String g711FilePath = '${appDocDir.path}/output.g711';
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// // Run FFmpeg command to encode PCM to G.711
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// String command =
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// '-y -f s16le -ar 8000 -ac 1 -i $pcmFilePath -f g711 -ar 8000 -ac 1 $g711FilePath';
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// int result = await flutterFFmpeg.execute(command);
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// if (result == 0) {
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// print(
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// 'PCM encoding to G.711 successful! G.711 file saved at: $g711FilePath');
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// // Read G.711 data from file
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// Uint8List g711Bytes = await File(g711FilePath).readAsBytes();
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// // Delete the temporary PCM file
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// await File(pcmFilePath).delete();
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// // Delete the temporary G.711 file
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// await File(g711FilePath).delete();
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// return g711Bytes;
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// } else {
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// print('Error during PCM encoding to G.711: $result');
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// return null;
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// }
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// } catch (e) {
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// print('Error: $e');
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// return null;
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// }
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// }
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}
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