43 lines
1.0 KiB
V
43 lines
1.0 KiB
V
import time
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import math
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import sokol.audio
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const (
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sw = time.new_stopwatch({})
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sw_start_ms = sw.elapsed().milliseconds()
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)
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[inline]
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fn sintone(periods int, frame int, num_frames int) f32 {
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return math.sinf(f32(periods) * (2 * math.pi) * f32(frame) / f32(num_frames))
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}
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fn my_audio_stream_callback(buffer &f32, num_frames int, num_channels int) {
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ms := sw.elapsed().milliseconds() - sw_start_ms
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unsafe {
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mut soundbuffer := buffer
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for frame := 0; frame < num_frames; frame++ {
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for ch := 0; ch < num_channels; ch++ {
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idx := frame * num_channels + ch
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if ms < 250 {
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soundbuffer[idx] = 0.5 * sintone(20, frame, num_frames)
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} else if ms < 300 {
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soundbuffer[idx] = 0.5 * sintone(25, frame, num_frames)
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} else if ms < 1500 {
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soundbuffer[idx] *= sintone(22, frame, num_frames)
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} else {
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soundbuffer[idx] = 0.5 * sintone(25, frame, num_frames)
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}
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}
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}
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}
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}
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fn main() {
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audio.setup(
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stream_cb: my_audio_stream_callback
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)
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time.sleep(2000 * time.millisecond)
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audio.shutdown()
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}
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