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//! This file implements the interface to save waves into a file.
use std::{
error::Error,
fmt::{self, Display, Formatter},
io::{self, Write},
};
use super::*;
#[derive(Debug)]
pub enum OutputError {
Io(std::io::Error),
FFMpeg(String),
EmptyWaves,
}
impl Display for OutputError {
fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
match self {
Self::Io(e) => write!(f, "io: {e}"),
Self::EmptyWaves => write!(f, "empty waves"),
OutputError::FFMpeg(s) => write!(f, "FFMPEG error: {s}"),
}
}
}
impl Error for OutputError {}
impl From<io::Error> for OutputError {
fn from(io: io::Error) -> Self {
Self::Io(io)
}
}
/// A type that implements this trait implements a generic function
/// for saving waves into files.
pub trait Output {
/// Save waves DATA with RATE samples per second into a file with
/// NAME.
fn save(&self, data: Wave, rate: Samples, name: &str) -> Result<(), OutputError>;
}
/// A dummy struct to hold a generic function for saving waves.
#[derive(Default)]
pub struct PlainOutput {}
impl Output for PlainOutput {
fn save(&self, data: Wave, _rate: Samples, name: &str) -> Result<(), OutputError> {
if data.is_empty() {
return Err(OutputError::EmptyWaves);
}
let bytes: Vec<u8> = data.iter().flat_map(|pulse| pulse.to_le_bytes()).collect();
let mut file = std::fs::OpenOptions::new()
.create(true)
.write(true)
.open(name)?;
file.write_all(&bytes)?;
Ok(())
}
}
#[cfg(feature = "ffmpeg")]
pub mod ffmpeg_output;
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