CODEWITHSUNDEEP
vb.netaudiomemorystreambinarywritertone-generator
swabygw
swabygw

Reputation: 913

Why write to BinaryWriter twice?

I'm implementing this tone-generator program and it works great:

https://social.msdn.microsoft.com/Forums/vstudio/en-US/c2b953b6-3c85-4eda-a478-080bae781319/beep-beep?forum=vbgeneral

What I can't figure out, is why the following two lines of code:

BW.Write(Sample)
BW.Write(Sample)

One "write" makes sense, but why the second "write"?

Upvotes: 0

Views: 61

Answers (1)

jaket
jaket

Reputation: 9341

The example is a bit cryptic but the wave file is configured to be 2 channels thus the two writes are simply sending the same audio data to both channels.

The wave header is this hardcoded bit:

Dim Hdr() As Integer = {&H46464952, 36 + Bytes, &H45564157, _
                        &H20746D66, 16, &H20001, 44100, _
                        176400, &H100004, &H61746164, Bytes}

Which decoded means:

    H46464952 = 'RIFF' (little endian)
    36+Bytes  = Length of header + length of data
    H45564157 = 'WAVE' (little endian)
    H20746D66 = 'fmt ' (little endian)
    16        = length of fmt chunk (always 16)
    H20001    = 0x0001: PCM, 
                0x0002: 2 channels
    44100     = sampleRate
    176400    = sampleRate*numChannels*bytesPerSample = 44100*2*2
    H100004   = 0x0004: numChannels*bytesPerSample, 
                0x0010: bitsPerSample (16)
    H61746164 = 'data'
    Bytes     = size of data chunk

Upvotes: 1

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