can you provide an example about creating a wave file?

[maurorappa]

Hi,

I'm struggling to create a wave file, I tried this simple program, but it doesn't sound right! (pardon my comicity )

file, err := os.OpenFile("./t.wav", os.O_RDWR|os.O_CREATE, 0666)
        if err != nil {
                fmt.Println(err)
        }
        // 8BitStereo
        var numSamples uint32 = 10
        var numChannels uint16 = 2
        var sampleRate uint32 = 44100
        var bitsPerSample uint16 = 8

        writer := NewWriter(file, numSamples, numChannels, sampleRate, bitsPerSample)
        samples := make([]Sample, numSamples)

        samples[0].Values[0] = 255
        samples[0].Values[1] = 0
        samples[1].Values[0] = 123
        samples[1].Values[1] = 234
        samples[2].Values[0] = 255
        samples[2].Values[1] = 0
        samples[3].Values[0] = 123
        samples[3].Values[1] = 234
        samples[4].Values[0] = 255
        samples[4].Values[1] = 0
        samples[5].Values[0] = 123
        samples[5].Values[1] = 234
        samples[6].Values[0] = 255
        samples[6].Values[1] = 0
        samples[7].Values[0] = 123
        samples[7].Values[1] = 234
        samples[8].Values[0] = 255
        samples[8].Values[1] = 0
        samples[9].Values[0] = 123
        samples[9].Values[1] = 234

        err = writer.WriteSamples(samples)
        if err != nil {
                fmt.Println(err)
        }

        file.Close()

On mac, if I play I just hear a quick bump.

play t.wav 

t.wav:

 File Size: 48        Bit Rate: 8.47M
  Encoding: Unsigned PCM  
  Channels: 2 @ 8-bit    
Samplerate: 44100Hz      
Replaygain: off         
  Duration: 00:00:00.00  

In:100%  00:00:00.00 [00:00:00.00] Out:2     [!=====|=====!] Hd:0.0 Clip:0    
Done.

is the file right, but I didn't specified any sound duration?

Help!

[edwvee]

That's all fine. The duration of your file is 10/44100 seconds.

[andrewyang17]

Any update on this? I have a slice of audio bytes data, have no idea how to create a wave file from it.. any example?

[edwvee]

Example above works. The only trouble is there is too short data. See my previous post.

[andrewyang17]

@edwvee,

thanks for the reply, but how to correctly change the type []byte of audio data to type []Sample? I saw the Sample type its Values field is array of 2 int. Sorry, I not knowing much in digital audio..

[edwvee]

I'll try to find my examples. That was too long ago. I guess two values because it's stereo. Try to read a known wav and recreate it while debugging. To convert just cast byte to int:

type Sample struct {
	Values [2]int
}