pile-audio refactor

crates/pile-flac/src/blocks/audiodata.rs

@@ -0,0 +1,42 @@
+use crate::{FlacDecodeError, FlacEncodeError};
+use std::fmt::Debug;
+
+/// An audio frame in a flac file
+pub struct FlacAudioFrame {
+	/// The audio frame
+	pub data: Vec<u8>,
+}
+
+impl Debug for FlacAudioFrame {
+	fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+		f.debug_struct("FlacAudioFrame")
+			.field("data_len", &self.data.len())
+			.finish()
+	}
+}
+
+impl FlacAudioFrame {
+	/// Decode the given data as a flac audio frame.
+	/// This should start with a sync sequence.
+	pub fn decode(data: &[u8]) -> Result<Self, FlacDecodeError> {
+		if data.len() <= 2 {
+			return Err(FlacDecodeError::MalformedBlock);
+		}
+
+		if !(data[0] == 0b1111_1111 && data[1] & 0b1111_1100 == 0b1111_1000) {
+			return Err(FlacDecodeError::BadSyncBytes);
+		}
+
+		Ok(Self {
+			data: Vec::from(data),
+		})
+	}
+}
+
+impl FlacAudioFrame {
+	/// Encode this audio frame.
+	pub fn encode(&self, target: &mut impl std::io::Write) -> Result<(), FlacEncodeError> {
+		target.write_all(&self.data)?;
+		return Ok(());
+	}
+}