7e4392ae68
This implements a proof-of-concept for an improved audio frontend. The largest change is the introduction of events and event handling: both by time elapsed and by track events, such as ending or looping. Following on from this, the library now includes a basic, event-driven track queue system (which people seem to ask for unusually often). A new sample, `examples/13_voice_events`, demonstrates both the `TrackQueue` system and some basic events via the `~queue` and `~play_fade` commands. Locks are removed from around the control of `Audio` objects, which should allow the backend to be moved to a more granular futures-based backend solution in a cleaner way.
68 lines
1.8 KiB
Rust
68 lines
1.8 KiB
Rust
use byteorder::{LittleEndian, WriteBytesExt};
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use std::mem;
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pub fn make_sine(float_len: usize, stereo: bool) -> Vec<u8> {
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let sample_len = mem::size_of::<f32>();
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let byte_len = float_len * sample_len;
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// set period to 100 samples == 480Hz sine.
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let mut out = vec![0u8; byte_len];
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let mut byte_slice = &mut out[..];
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for i in 0..float_len {
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let x_val = (i as f32) * 50.0 / std::f32::consts::PI;
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byte_slice.write_f32::<LittleEndian>(x_val.sin()).unwrap();
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}
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if stereo {
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let mut new_out = vec![0u8; byte_len * 2];
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for (mono_chunk, stereo_chunk) in out[..]
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.chunks(sample_len)
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.zip(new_out[..].chunks_mut(2 * sample_len))
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{
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stereo_chunk[..sample_len].copy_from_slice(mono_chunk);
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stereo_chunk[sample_len..].copy_from_slice(mono_chunk);
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}
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new_out
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} else {
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out
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}
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}
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pub fn make_pcm_sine(i16_len: usize, stereo: bool) -> Vec<u8> {
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let sample_len = mem::size_of::<i16>();
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let byte_len = i16_len * sample_len;
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// set period to 100 samples == 480Hz sine.
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// amplitude = 10_000
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let mut out = vec![0u8; byte_len];
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let mut byte_slice = &mut out[..];
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for i in 0..i16_len {
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let x_val = (i as f32) * 50.0 / std::f32::consts::PI;
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byte_slice
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.write_i16::<LittleEndian>((x_val.sin() * 10_000.0) as i16)
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.unwrap();
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}
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if stereo {
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let mut new_out = vec![0u8; byte_len * 2];
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for (mono_chunk, stereo_chunk) in out[..]
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.chunks(sample_len)
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.zip(new_out[..].chunks_mut(2 * sample_len))
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{
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stereo_chunk[..sample_len].copy_from_slice(mono_chunk);
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stereo_chunk[sample_len..].copy_from_slice(mono_chunk);
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}
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new_out
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} else {
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out
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}
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}
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