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use std::{
fmt::{self, Debug, Formatter},
convert::TryFrom,
fs::File,
io::Read,
path::Path,
time::Duration,
};
use anyhow::{Context, Error};
use hound::{WavReader, WavSpec};
use hotg_rune_core::{Value};
use hotg_rune_runtime::ParameterError;
use crate::run::multi::{Builder, SourceBackedCapability};
#[derive(Clone, PartialEq)]
pub struct AudioClip {
spec: WavSpec,
samples: Vec<i16>,
}
impl AudioClip {
pub fn from_wav_file(filename: impl AsRef<Path>) -> Result<Self, Error> {
let filename = filename.as_ref();
let f = File::open(filename).with_context(|| {
format!("Unable to open \"{}\" for reading", filename.display())
})?;
let wav = WavReader::new(f)?;
AudioClip::load(wav)
}
pub fn load(reader: WavReader<impl Read>) -> Result<Self, Error> {
let spec = reader.spec();
let samples = reader
.into_samples()
.collect::<Result<Vec<i16>, hound::Error>>()
.context("Unable to parse the WAV file")?;
Ok(AudioClip { spec, samples })
}
}
impl Debug for AudioClip {
fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
let AudioClip { spec, samples } = self;
f.debug_struct("AudioClip")
.field("spec", spec)
.field("samples", &format_args!("({} samples)", samples.len()))
.finish()
}
}
#[derive(Debug, Clone, PartialEq)]
pub struct Sound {
pcm_samples: Vec<i16>,
}
impl SourceBackedCapability for Sound {
type Builder = SoundSettings;
type Source = AudioClip;
fn generate(&mut self, buffer: &mut [u8]) -> Result<usize, Error> {
let chunk_size = std::mem::size_of::<i16>();
let mut bytes_written = 0;
for (chunk, sample) in
buffer.chunks_mut(chunk_size).zip(&self.pcm_samples)
{
let sample = sample.to_ne_bytes();
chunk.copy_from_slice(&sample);
bytes_written += sample.len();
}
Ok(bytes_written)
}
fn from_builder(
builder: SoundSettings,
source: &AudioClip,
) -> Result<Self, Error> {
let total_samples = builder.total_samples(source.samples.len())?;
Ok(Sound {
pcm_samples: source.samples[..total_samples].to_vec(),
})
}
}
#[derive(Debug, Default, Clone, PartialEq)]
pub struct SoundSettings {
frequency: Option<u32>,
duration: Option<Duration>,
}
impl SoundSettings {
fn total_samples(&self, max_samples: usize) -> Result<usize, Error> {
match *self {
SoundSettings {
frequency: None,
duration: None,
} => Ok(max_samples),
SoundSettings {
frequency: Some(frequency),
duration: Some(duration),
} => {
let total_samples = usize::try_from(
(frequency as u128) * duration.as_micros() / 1_000_000,
)?;
if total_samples > max_samples {
anyhow::bail!(
"{} samples were requested but only {} are available",
total_samples,
max_samples
);
}
Ok(total_samples)
},
SoundSettings { duration: None, .. } => {
anyhow::bail!("The \"sample_duration\" parameter wasn't set")
},
SoundSettings {
frequency: None, ..
} => anyhow::bail!("The \"frequency\" parameter wasn't set"),
}
}
}
impl Builder for SoundSettings {
fn set_parameter(
&mut self,
key: &str,
value: Value,
) -> Result<(), ParameterError> {
let SoundSettings {
frequency,
duration,
} = self;
match key {
"hz" | "frequency" => super::try_from_int_value(frequency, value),
"sample_duration_ms" => {
super::try_from_int_value_and_then(value, |ms| {
*duration = Some(Duration::from_millis(ms))
})
},
"sample_duration" => {
super::try_from_int_value_and_then(value, |secs| {
*duration = Some(Duration::from_secs(secs))
})
},
_ => Err(ParameterError::UnsupportedParameter),
}
}
}