Как преобразовать данные PCM в wav-файл?

Question

У меня есть все данные в rawData1 aray, это короткий массив. Я преобразовал его в байт aray.Then я создал wav-файл заголовка, а затем этот заголовок и байтовый массив данных записывается в файл. Но я получаю сообщение об ошибке «Windows Media Player становится проблемой во время воспроизведения файла». Может ли кто-нибудь помочь мне?

 public void save file 
     { 
     byte[] byte_array = new byte[rawData1.Length * 2]; 
     for (int i = 0; i < rawData1.Length; ++i) 
     { 
      //byte_array[2 * i] = getByte1(rawData1[i]); 
      //byte_array[2 * i + 1] = getByte2(rawData1[i]); 
      byte_array[2 * i] = getByte2(rawData1[i]); 
      byte_array[2 * i + 1] = getByte1(rawData1[i]); 
     } 

     uint numsamples = 44100; 
     ushort numchannels = 2; 
     ushort samplelength = 1; // in bytes 
     uint samplerate = 22050; 

     StorageFolder storageFolder = KnownFolders.MusicLibrary; 
     StorageFile file = await storageFolder.CreateFileAsync("sample.wav",  CreationCollisionOption.GenerateUniqueName); 

     Stream stream = await file.OpenStreamForWriteAsync(); 
     BinaryWriter wr = new BinaryWriter(stream); 

     wr.Write("RIFF".ToCharArray()); 
     wr.Write(36 + numsamples * numchannels * samplelength); 
     wr.Write("WAVEfmt".ToCharArray()); 
     wr.Write(16); 
     wr.Write((ushort)1); 
     wr.Write(numchannels); 
     wr.Write(samplerate); 
     wr.Write(samplerate * samplelength * numchannels); 
     wr.Write(samplelength * numchannels); 
     wr.Write((ushort)(8 * samplelength)); 
     wr.Write("data".ToCharArray()); 
     wr.Write(numsamples * samplelength); 
     wr.Write(byte_array); 
     wr.Dispose(); 
     stream.Dispose(); 
     } 
     public static byte getByte1(short s) 
     { 
     return (byte)s; 
     } 

     public static byte getByte2(short s) 
     { 
     int temp= s >> 8; 
     return (byte)temp; 
     } 

Может кто-нибудь мне помочь?

Answer 1

Вот очень Подробное описание формата WAV

The canonical WAVE format starts with the RIFF header: 
------------------------------------------------- 
Offset Size Name    Description 
------------------------------------------------- 
0   4 ChunkID   Contains the letters "RIFF" in ASCII form 
           (0x52494646 big-endian form). 
4   4 ChunkSize  36 + SubChunk2Size, or more precisely: 
           4 + (8 + SubChunk1Size) + (8 + SubChunk2Size) 
           This is the size of the rest of the chunk 
           following this number. This is the size of the 
           entire file in bytes minus 8 bytes for the 
           two fields not included in this count: 
           ChunkID and ChunkSize. 
8   4 Format   Contains the letters "WAVE" 
           (0x57415645 big-endian form). 

The "WAVE" format consists of two subchunks: "fmt " and "data": 
The "fmt " subchunk describes the sound data's format: 

12  4 Subchunk1ID  Contains the letters "fmt " 
           (0x666d7420 big-endian form). 
16  4 Subchunk1Size 16 for PCM. This is the size of the 
           rest of the Subchunk which follows this number. 
20  2 AudioFormat  PCM = 1 (i.e. Linear quantization) 
           Values other than 1 indicate some 
           form of compression. 
22  2 NumChannels  Mono = 1, Stereo = 2, etc. 
24  4 SampleRate  8000, 44100, etc. 
28  4 ByteRate   == SampleRate * NumChannels * BitsPerSample/8 
32  2 BlockAlign  == NumChannels * BitsPerSample/8 
           The number of bytes for one sample including 
           all channels. I wonder what happens when 
           this number isn't an integer? 
34  2 BitsPerSample 8 bits = 8, 16 bits = 16, etc. 
      2 ExtraParamSize if PCM, then doesn't exist 
      X ExtraParams  space for extra parameters 

The "data" subchunk contains the size of the data and the actual sound: 

36  4 Subchunk2ID  Contains the letters "data" 
           (0x64617461 big-endian form). 
40  4 Subchunk2Size == NumSamples * NumChannels * BitsPerSample/8 
           This is the number of bytes in the data. 
           You can also think of this as the size 
           of the read of the subchunk following this 
           number. 
44  * Data    The actual sound data. 

Все подробности здесь

https://ccrma.stanford.edu/courses/422/projects/WaveFormat/