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35 lines
1.3 KiB
V
35 lines
1.3 KiB
V
// This program illustrates how to use sokol.audio in a simple console app, *without a gui*.
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// See melody.v for an example of how it can be integrated into a graphics app.
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import time
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import sokol.audio
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fn audio_callback(mut soundbuffer &f32, num_frames int, num_channels int, mut frame_0 &i32) {
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for frame := 0; frame < num_frames; frame++ {
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t := i32(f32(*frame_0 + frame) * 0.245)
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y := (t * (((t / 10 | 0) ^ ((t / 10 | 0) - 1280)) % 11) / 2 & 127) +
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(t * (((t / 640 | 0) ^ ((t / 640 | 0) - 2)) % 13) / 2 & 127)
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for ch := 0; ch < num_channels; ch++ {
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idx := frame * num_channels + ch
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a := f32(y - 127) / 255.0
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soundbuffer[idx] = a
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}
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}
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frame_0 += num_frames
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}
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// The example uses \r, to show a simple progress bar, while the music is playing.
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// That works best, if the output is not buffered at all.
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unbuffer_stdout()
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println('The ByteBeat formula used in this example is from https://www.youtube.com/watch?v=V4GfkFbDojc , "Techno" by Gabriel Miceli')
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mut frame_0 := i32(0) // offset of the current audio frames, relative to the start of the music
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audio.setup(stream_userdata_cb: audio_callback, user_data: &frame_0) // our state/user_data can be just a simple integer
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for t in 0 .. 600 {
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print('\r> t: ${t:5}s , frame_0: ${frame_0:10} samples')
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time.sleep(1 * time.second)
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}
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println('\nGood bye.')
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audio.shutdown()
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