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mby faster audio generation

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This commit is contained in:
Rolf Martin Glomsrud 2023-03-06 15:48:25 +01:00
parent 483af34fa7
commit 937ac30517
1 changed files with 13 additions and 21 deletions
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34
src/soundGenerator.rs
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@ -24,12 +24,6 @@ const SUBCHUNK_2_SIZE:&str = "----";
const MAX_AMPLITUDE:usize = 32760;
fn write_as_bytes(vec:&mut Vec<u8>, value:usize, byte_size:u8){
let mut bytes = value.to_le_bytes();
vec.append(&mut bytes[0..byte_size as usize].to_vec());
}
pub async fn generateTone(frequency: f32, duration:f32) -> Sound{
// const CHUNK_ID:&str = "RIFF";
@ -75,36 +69,34 @@ pub async fn generateTone(frequency: f32, duration:f32) -> Sound{
let startAudio = soundFileBytes.len();
let mut collect = Vec::new();
let lim = ((SAMPLE_RATE as f32 * duration) as usize);
for i in 0..((SAMPLE_RATE as f32 * duration) as usize){
let amplitude = 500. * f32::sin((i as f32 - 300.) / 1200.);
let value = f32::sin((2. * PI * (i as f32) * (frequency as f32)) / SAMPLE_RATE as f32);
let channel = (amplitude * if i+100 > lim {0.} else {value});
collect.push(channel);
soundFileBytes.append(&mut (channel as i16).to_le_bytes().to_vec());
for i in channel.to_le_bytes(){
soundFileBytes.push(i);
}
}
let endAudio = soundFileBytes.len();
let endAudio = soundFileBytes.len() as u32;
let mut holder = Vec::new();
write_as_bytes(&mut holder, endAudio-startAudio, 4);
for i in 0..4{
soundFileBytes[(startAudio-4)+i] = holder[i];
for (i, elem) in (endAudio-startAudio as u32).to_le_bytes().into_iter().enumerate(){
soundFileBytes[(startAudio-4)+i] = elem;
}
holder.clear();
write_as_bytes(&mut holder, 36+endAudio-startAudio, 4);
for i in 0..4{
soundFileBytes[4+i] = holder[i];
for (i, elem) in (36+endAudio-startAudio as u32).to_be_bytes().into_iter().enumerate(){
soundFileBytes[4+i] = elem;
}
let sound = load_sound_from_bytes(&soundFileBytes).await.expect("Failed to load");
load_sound_from_bytes(&soundFileBytes).await.expect("Failed to load")
sound
}