/// Maximum number of channels supported in the FLAC format.
pub const MAX_CHANNELS: usize = 8;

/// Audio frame that contains one sample for each channel.
pub struct Frame {
  /// Information regarding the current audio frame.
  pub header: Header,
  /// CRC-16 of all frame bytes before this footer.
  pub footer: Footer,
}

/// Channel assignment order.
#[derive(Clone, Copy, Debug, PartialEq, Eq)]
pub enum ChannelAssignment {
  /// Independent channels, from one up to eight.
  Independent,
  /// Left and side stereo.
  LeftSide,
  /// Right and side stereo.
  RightSide,
  /// Middle and side stereo.
  MiddleSide,
}

#[derive(Clone, Copy, Debug, PartialEq, Eq)]
pub enum NumberType {
  Frame(u32),
  Sample(u64),
}

/// Information regarding the current audio frame.
#[derive(Debug, PartialEq, Eq)]
pub struct Header {
  pub block_size: u32,
  pub sample_rate: u32,
  pub channels: u8,
  pub channel_assignment: ChannelAssignment,
  pub bits_per_sample: usize,
  pub number: NumberType,
  pub crc: u8,
}

/// End of the audio frame.
///
/// Contains a value that represents the CRC-16 of everything inside the
/// frame before the footer.
#[derive(Debug, PartialEq, Eq)]
pub struct Footer(pub u16);

/// Maximum number of channels supported in the FLAC format.
pub const MAX_CHANNELS: usize = 8;

/// Audio frame that contains one sample for each channel.
pub struct Frame {
  /// Information regarding the current audio frame.
  pub header: Header,
  /// CRC-16 of all frame bytes before this footer.
  pub footer: Footer,
}

/// Channel assignment order.
#[derive(Clone, Copy, Debug, PartialEq, Eq)]
pub enum ChannelAssignment {
  Independent = 0,
  LeftSide    = 1,
  RightSide   = 2,
  MiddleSide  = 3,
}

#[derive(Clone, Copy, Debug, PartialEq, Eq)]
pub enum NumberType {
  Frame(u32),
  Sample(u64),
}

/// Information regarding the current audio frame.
#[derive(Debug, PartialEq, Eq)]
pub struct Header {
  pub block_size: u32,
  pub sample_rate: u32,
  pub channels: u8,
  pub channel_assignment: ChannelAssignment,
  pub bits_per_sample: usize,
  pub number: NumberType,
  pub crc: u8,
}

/// End of the audio frame.
///
/// Contains a value that represents the CRC-16 of everything inside the
/// frame before the footer.
#[derive(Debug, PartialEq, Eq)]
pub struct Footer(pub u16);

--- 
+++ 
@@ -12,10 +12,14 @@
 /// Channel assignment order.
 #[derive(Clone, Copy, Debug, PartialEq, Eq)]
 pub enum ChannelAssignment {
-  Independent = 0,
-  LeftSide    = 1,
-  RightSide   = 2,
-  MiddleSide  = 3,
+  /// Independent channels, from one up to eight.
+  Independent,
+  /// Left and side stereo.
+  LeftSide,
+  /// Right and side stereo.
+  RightSide,
+  /// Middle and side stereo.
+  MiddleSide,
 }
 
 #[derive(Clone, Copy, Debug, PartialEq, Eq)]
Add documentation for ChannelAssignment fields
