C# Wave.Mp3FileReader类代码示例

        public TestSpeed()
        {
            //WaveStream str1 = new Mp3FileReader("C:\\Users\\mtemkine\\Desktop\\snd\\guitar1.mp3");
            //WaveStream str2 = new Mp3FileReader("C:\\Users\\mtemkine\\Desktop\\snd\\molecules.mp3");
            //WaveMixerStream32 mix = new WaveMixerStream32(new [] {str1, str2}, false);

            var mp3Filename = @"C:\WS\jmerde\trunk\_VisualStudio\AudioBooker\IlyaFranker\Content\snd\ilyafrank_open.mp3";

            WavComposite writer = new WavComposite("../../wawa.wav");

            writer.AppendAllOfFile(mp3Filename, null);
            writer.AppendAllOfFile(mp3Filename, 2);
            writer.AppendAllOfFile(mp3Filename, 0.5);
            writer.Close();

            //format = readerWave.WaveFormat;
            //writer = new WaveFileWriter(destFilename, format);
            //var wave = new Mp3FileReader(mp3Filename);

            using (var reader = new Mp3FileReader(mp3Filename))
            using (var pcmStream = WaveFormatConversionStream.CreatePcmStream(reader))
            using (var downsampledStream = new WaveFormatConversionStream(new WaveFormat(
                (int)(pcmStream.WaveFormat.SampleRate * 1.5),
                reader.WaveFormat.BitsPerSample,
                reader.WaveFormat.Channels), pcmStream))
            {

                WaveFileWriter.CreateWaveFile("../../xello.wav", downsampledStream);
            }
        }

 public void PlaySound(string name, Action done = null)
 {
     FileStream ms = File.OpenRead(_soundLibrary[name]);
     var rdr = new Mp3FileReader(ms);
     WaveStream wavStream = WaveFormatConversionStream.CreatePcmStream(rdr);
     var baStream = new BlockAlignReductionStream(wavStream);
     var waveOut = new WaveOut(WaveCallbackInfo.FunctionCallback());
     waveOut.Init(baStream);
     waveOut.Play();
     var bw = new BackgroundWorker();
     bw.DoWork += (s, o) =>
                      {
                          while (waveOut.PlaybackState == PlaybackState.Playing)
                          {
                              Thread.Sleep(100);
                          }
                          waveOut.Dispose();
                          baStream.Dispose();
                          wavStream.Dispose();
                          rdr.Dispose();
                          ms.Dispose();
                          if (done != null) done();
                      };
     bw.RunWorkerAsync();
 }

        public byte[] Encode()
        {
            int ms = 20;
            int channels = 2;
            int sampleRate = 48000;

            int blockSize = 48 * 2 * channels * ms; //the size per each frame to encode
            byte[] buffer = new byte[blockSize]; //a nicely sized pcm buffer to work with.
            var outFormat = new WaveFormat(sampleRate, 16, channels);
            
            if(__filename.EndsWith(".mp3"))
            {
                using (var mp3Reader = new Mp3FileReader(__filename))
                {
                    using (var resampler = new WaveFormatConversionStream(outFormat, mp3Reader))
                    {
                        int byteCount;
                        using (BinaryWriter bw = new BinaryWriter(new MemoryStream()))
                        {
                            while ((byteCount = resampler.Read(buffer, 0, blockSize)) > 0)
                            {
                                //now to encode
                                byte[] opusOutput = new byte[buffer.Length]; //extra bytes but that's okay
                                int opusEncoded = encoder.EncodeFrame(buffer, 0, opusOutput);
                                bw.Write((ushort)opusEncoded);
                                bw.Write(opusOutput, 0, opusEncoded);
                            }
                            MemoryStream baseStream = bw.BaseStream as MemoryStream;
                            return baseStream.ToArray();
                        }
                    }
                }
            }
            return null;
        }

 public void CanLoadAndReadVariousProblemMp3Files()
 {
     string testDataFolder = @"C:\Users\Mark\Downloads\NAudio";
     if (!Directory.Exists(testDataFolder))
     {
         Assert.Ignore("{0} not found", testDataFolder);
     }
     foreach (string file in Directory.GetFiles(testDataFolder, "*.mp3"))
     {
         string mp3File = Path.Combine(testDataFolder, file);
         Debug.WriteLine(String.Format("Opening {0}", mp3File));
         using (var reader = new Mp3FileReader(mp3File))
         {
             byte[] buffer = new byte[4096];
             int bytesRead;
             int total = 0;
             do
             {
                 bytesRead = reader.Read(buffer, 0, buffer.Length);
                 total += bytesRead;
             } while (bytesRead > 0);
             Debug.WriteLine(String.Format("Read {0} bytes", total));
         }
     }
 }

        private static void CutFile(string sourceFile, int startSecond, int endSecond, string resultFile)
        {
            using (var reader = new Mp3FileReader(sourceFile))
            {
                FileStream writer = File.Create(resultFile);

                Mp3Frame frame;
                while ((frame = reader.ReadNextFrame()) != null)
                {

                    var currentSecond = (int)reader.CurrentTime.TotalSeconds;
                    if (currentSecond >= startSecond && currentSecond <= endSecond)
                    {
                        writer.Write(frame.RawData, 0, frame.RawData.Length);
                    }
                    else
                    {
                        if (currentSecond > endSecond)
                        {
                            writer.Dispose();
                            break;
                        }
                    }
                }

                writer.Dispose();
            }
        }

        public static Task Play(this Captcha captcha)
        {
            return Task.Run(() =>
            {
                using (MemoryStream memory = new MemoryStream(captcha.Data, false))
                {
                    memory.Seek(0, SeekOrigin.Begin);

                    using (Mp3FileReader reader = new Mp3FileReader(memory))
                    using (WaveStream pcm = WaveFormatConversionStream.CreatePcmStream(reader))
                    using (WaveStream stream = new BlockAlignReductionStream(pcm))
                    {
                        using (WaveOut waveOut = new WaveOut(WaveCallbackInfo.FunctionCallback()))
                        {
                            waveOut.Init(stream);
                            waveOut.Play();

                            while (waveOut.PlaybackState == PlaybackState.Playing)
                            {
                                Thread.Sleep(100);
                            }
                        }
                    }
                }
            });
        }

 private static TimeSpan GetFileLength(string mp3Path)
 {
     using (var reader = new Mp3FileReader(mp3Path))
     {
         return reader.TotalTime;
     }
 }

 /// <summary>
 /// Считывает данные о заголоке из MP3 файла
 /// </summary>
 public static NAudio.Wave.WaveFormat WavHeaderFromMp3(Stream Stream)
 {
     using (var reader = new NAudio.Wave.Mp3FileReader(Stream))
     {
         return reader.WaveFormat;
     }
 }

        public double[][] GetNextChunk(int samplesDesired, Mp3FileReader fr, bool fullnormalize = false)
        {
            byte[] buffer = new byte[samplesDesired * 4];
            short[] left = new short[samplesDesired];
            //short[] right = new short[samplesDesired];
            double[] leftd = new double[samplesDesired];
            //double[] rightd = new double[samplesDesired];

            int bytesRead = 0;

            try
            {
                bytesRead = fr.Read(buffer, 0, 4 * samplesDesired);
            }
            catch
            {
                new Exception("An error occurred while reading file");
            }

            int index = 0;
            for (int sample = 0; sample < bytesRead / 4; sample++)
            {
                left[sample] = BitConverter.ToInt16(buffer, index); index += 2;
                //right[sample] = BitConverter.ToInt16(buffer, index);
                index += 2;
            }

            if (fullnormalize)
                leftd = Utilities.NormalizeFull(ref left, left.Length);
            else
                leftd = Utilities.Normalize(ref left, left.Length);

            return new double[][] { leftd, null }; //rightd };
        }

 public static void Mp3ToWav(string mp3File, string outputFile)
 {
     using (Mp3FileReader reader = new Mp3FileReader(mp3File))
     {
         WaveFileWriter.CreateWaveFile(outputFile, reader);
     }
 }

        public AudioPlayer(Resource resource, TabPage tab)
        {
            var soundData = (Sound)resource.Blocks[BlockType.DATA];

            var stream = soundData.GetSoundStream();
            waveOut = new WaveOutEvent();

            if (soundData.Type == Sound.AudioFileType.WAV)
            {
                var rawSource = new WaveFileReader(stream);
                waveOut.Init(rawSource);
            }
            else if (soundData.Type == Sound.AudioFileType.MP3)
            {
                var rawSource = new Mp3FileReader(stream);
                waveOut.Init(rawSource);
            }

            playButton = new Button();
            playButton.Text = "Play";
            playButton.TabIndex = 1;
            playButton.Size = new Size(100, 25);
            playButton.Click += PlayButton_Click;

            tab.Controls.Add(playButton);
        }

    protected void FileSelected(string path)
    {
        fileBrowser = null;

        if (path != null)
        {
            Debug.Log(path);
            if(path.Contains(".mp3"))
            {
                Debug.Log(path);
                using (Mp3FileReader reader = new Mp3FileReader(path))
                {
                    Debug.Log("Reached");
                    path = path.Replace(".mp3", ".wav");
                    WaveFileWriter.CreateWaveFile(path , reader);
                }
            }
            path = "file://" + path;
            WWW wtf = new WWW(path);

            //Wait for wtf to finish
            while (!wtf.isDone)
            {
            }
            SceneManager.getInstance.setClip(wtf.GetAudioClip(false));
        }
    }

        public bool PlayMP3(string fileName)
        {
            if (fileName == null) { return false; }

              if (fileName.StartsWith("http")) {
            return StreamMP3(fileName);
              }

              speaking = true;
              WSRConfig.GetInstance().logInfo("PLAYER", "Start MP3 Player");
              using (var ms = File.OpenRead(fileName))
              using (var mp3Reader = new Mp3FileReader(ms))
              using (var pcmStream = WaveFormatConversionStream.CreatePcmStream(mp3Reader))
              using (var baStream = new BlockAlignReductionStream(pcmStream))
              using (var waveOut = new WaveOut(WaveCallbackInfo.FunctionCallback())) {
            waveOut.Init(baStream);
            waveOut.Play();
            played.Add(fileName);
            while (baStream.CurrentTime < baStream.TotalTime && played.Contains(fileName)) {
              Thread.Sleep(100);
            }
            played.Remove(fileName);
            waveOut.Stop();

              }
              WSRConfig.GetInstance().logInfo("PLAYER", "End MP3 Player");
              speaking = false;
              return true;
        }

        public string Describe(string fileName)
        {
            var stringBuilder = new StringBuilder();
            using (var reader = new Mp3FileReader(fileName))
            {
                Mp3WaveFormat wf = reader.Mp3WaveFormat;
                stringBuilder.AppendFormat("MP3 File WaveFormat: {0} {1}Hz {2} channels {3} bits per sample\r\n",
                    wf.Encoding, wf.SampleRate,
                    wf.Channels, wf.BitsPerSample);
                stringBuilder.AppendFormat("Extra Size: {0} Block Align: {1} Average Bytes Per Second: {2}\r\n",
                    wf.ExtraSize, wf.BlockAlign,
                    wf.AverageBytesPerSecond);
                stringBuilder.AppendFormat("ID: {0} Flags: {1} Block Size: {2} Frames per Block: {3}\r\n",
                    wf.id, wf.flags, wf.blockSize, wf.framesPerBlock
                    );

                stringBuilder.AppendFormat("Length: {0} bytes: {1} \r\n", reader.Length, reader.TotalTime);
                stringBuilder.AppendFormat("ID3v1 Tag: {0}\r\n", reader.Id3v1Tag == null ? "None" : reader.Id3v1Tag.ToString());
                stringBuilder.AppendFormat("ID3v2 Tag: {0}\r\n", reader.Id3v2Tag == null ? "None" : reader.Id3v2Tag.ToString());
                Mp3Frame frame;
                while ((frame = reader.ReadNextFrame()) != null)
                {
                    stringBuilder.AppendFormat("{0},{1},{2}Hz,{3},{4}bps, length {5}\r\n",
                        frame.MpegVersion, frame.MpegLayer,
                        frame.SampleRate, frame.ChannelMode,
                        frame.BitRate, frame.FrameLength);
                }
            }
            return stringBuilder.ToString();
        }

        public SoundResource(ResourceManager mgr, string fullName, Stream stream, Format fmt)
        {
            _manager = mgr;
            FullName = fullName;

            switch (fmt)
            {
                case Format.MP3:
                {
                    Mp3FileReader mp3 = new Mp3FileReader(stream);
                    _reader = mp3;
                    break;
                }
                case Format.WAV:
                {
                    WaveFileReader wav = new WaveFileReader(stream);
                    _reader = wav;
                    break;
                }
                default:
                    throw new InvalidOperationException("Unsupported extension.");
            }

            _stream = new WaveChannel32(_reader);
            _stream.PadWithZeroes = false;

            _wavDevice.PlaybackStopped += _wavDevice_PlaybackStopped;
        }