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const BUFFER_SIZE: usize = 2048; + +/// Example usage +/// ```rust +/// fn main() { +/// let mut xm = libxm::XMContext::new( +/// include_bytes!("path/to/file.xm"), +/// 48000 +/// ).expect("failed to parse xm"); +/// +/// let (_stream, stream_handle) = rodio::OutputStream::try_default().unwrap(); +/// +/// let mut samples: [f32; rodio_xm::BUFFER_SIZE] = [0.0; rodio_xm::BUFFER_SIZE]; +/// xm.generate_samples(&mut samples); +/// +/// let source = rodio_xm::XMSource::new(xm); +/// let sink = rodio::Sink::try_new(&stream_handle).unwrap(); +/// +/// sink.append(source); +/// sink.sleep_until_end(); +/// } +/// ``` +pub struct XMSource { + xm_context: XMContext, + buffer: [f32; BUFFER_SIZE], + buffer_index: usize, +} + +impl XMSource { + pub fn new(xm_context: XMContext) -> Self { + XMSource { + xm_context, + buffer: [0.0; BUFFER_SIZE], + buffer_index: 0 + } + } + + pub fn from_bytes(bytes: &[u8]) -> Self { + let xm = libxm::XMContext::new(bytes, 48000) + .expect("failed to parse xm"); + + self::new(xm) + } + + pub fn from_file(path: PathBuf) -> Self { + let file = fs::read(path).expect("couldn't read file"); + let xm = libxm::XMContext::new(file.as_bytes(), 48000) + .expect("failed to parse xm"); + + self::new(xm) + } +} + +impl Source for XMSource { + fn current_frame_len(&self) -> Option { + Some(BUFFER_SIZE - self.buffer_index) + } + + fn channels(&self) -> u16 { 2 } + + fn sample_rate(&self) -> u32 { 48000 } + + fn total_duration(&self) -> Option { None } +} + +impl Iterator for XMSource { + type Item = f32; + + fn next(&mut self) -> Option { + self.buffer_index += 1; + + if self.buffer_index >= BUFFER_SIZE { + self.xm_context.generate_samples(&mut self.buffer); + self.buffer_index = 0; + } + + Some(self.buffer[self.buffer_index]) + } +}