在.ogg中将Opus (.wav)转换为PCM (.wav)

Question

我有一个文件.ogg，我需要将它转换为.wav。我打算使用Opus.Net (使用NAudio)，但是在OpusDecoder.Decode()中得到了这个异常：

"System.Exception：‘解码失败- InvalidPacket'“

这是代码：

byte[] audioBynary = File.ReadAllBytes($"{filePath}{fileOgg}");

_decoder = OpusDecoder.Create(48000, 1);
var pcmBinary = _decoder.Decode(audioBynary, audioBynary.Length, out int decodedLenght);

WaveFileWriter.CreateWaveFile($"{filePath}{fileWav}", new WaveFileReader(new MemoryStream(pcmBinary)));

Answer 1

对我来说，我使用Concentus读取ogg/opus文件，将其字节复制到memoryStream中，然后使用它创建一个RawSourceWaveStream。我可以从ISampleProvider中获得一个RawSourceWaveStream，这就是您需要为WaveFileWriter.CreateWaveFile16提供的内容。

沃伊拉

        var filePath = $@"C:\Users\blabla\foo\bar\";
        var fileOgg = "testAudio.ogg";
        var fileWav = "testAudio.wav";

        using (FileStream fileIn = new FileStream($"{filePath}{fileOgg}", FileMode.Open))
        using (MemoryStream pcmStream = new MemoryStream())
        {
            OpusDecoder decoder = OpusDecoder.Create(48000, 1);
            OpusOggReadStream oggIn = new OpusOggReadStream(decoder, fileIn);
            while (oggIn.HasNextPacket)
            {
                short[] packet = oggIn.DecodeNextPacket();
                if (packet != null)
                {
                    for (int i = 0; i < packet.Length; i++)
                    {
                        var bytes = BitConverter.GetBytes(packet[i]);
                        pcmStream.Write(bytes, 0, bytes.Length);
                    }
                }
            }
            pcmStream.Position = 0;
            var wavStream = new RawSourceWaveStream(pcmStream, new WaveFormat(48000, 1));
            var sampleProvider = wavStream.ToSampleProvider(); 
            WaveFileWriter.CreateWaveFile16($"{filePath}{fileWav}", sampleProvider);