diff --git a/src/decoder.rs b/src/decoder.rs
index 713ae07..f69a42c 100644
--- a/src/decoder.rs
+++ b/src/decoder.rs
@@ -235,6 +235,57 @@ impl Decoder {
 	}
 }
 
+trait Demuxer {
+	
+}
+
+struct FfmpegDemuxer {
+	input_ctx: DemuxContext,
+	best_stream_idx: usize,
+	decoder: DecodeContext,
+}
+
+impl FfmpegDemuxer {
+	pub fn new (filename: &str) -> Result <Self> {
+		let input_ctx = ffmpeg_next::format::input (&filename)?;
+		let stream = input_ctx
+		.streams ()
+		.best (ffmpeg_next::media::Type::Audio)
+		.ok_or_else (|| anyhow! ("can't find good audio stream"))?;
+		let best_stream_idx = stream.index ();
+		
+		let decoder = stream.codec ().decoder ().audio ()?;
+		
+		Ok (Self {
+			input_ctx,
+			best_stream_idx,
+			decoder,
+		})
+	}
+}
+
+impl FfmpegDemuxer {
+	fn pump (&mut self) -> Result <
+}
+
+use crate::net_reader::NetReader;
+
+struct HttpOggDemuxer {
+	ogg_rdr: ogg::reading::PacketReader <std::io::BufReader <NetReader>>,
+}
+
+impl HttpOggDemuxer {
+	pub fn new (url: String) -> Result <Self> {
+		let net_rdr = NetReader::new (url)?;
+		let buf_rdr = std::io::BufReader::new (net_rdr);
+		let mut ogg_rdr = ogg::reading::PacketReader::new (buf_rdr);
+		
+		Ok (Self {
+			ogg_rdr,
+		})
+	}
+}
+
 #[cfg (test)]
 mod test {
 	use super::*;
diff --git a/src/main.rs b/src/main.rs
index 964b968..20b1ba7 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -36,6 +36,7 @@ use fltk::{
 };
 
 mod decoder;
+mod net_reader;
 
 const BUFFER_SIZE: usize = 5_000;
 
@@ -68,66 +69,8 @@ fn cmd_debug_net (args: &[String]) -> Result <()> {
 	let url = args.get (1).ok_or_else (|| anyhow! ("Need a URL"))?
 	.to_string ();
 	
-	struct NetReader {
-		client: reqwest::blocking::Client,
-		url: String,
-		len: u64,
-		cursor: u64,
-	}
-	
-	impl Read for NetReader {
-		fn read (&mut self, dest: &mut [u8]) -> io::Result <usize>
-		{
-			tracing::trace! ("NetReader reading {}-{}", self.cursor, self.cursor + dest.len () as u64);
-			
-			let range_hdr = format! ("bytes={}-{}", self.cursor, self.cursor + dest.len () as u64 - 1);
-			
-			let mut resp = self.client.get (&self.url)
-			.header (reqwest::header::RANGE, range_hdr)
-			.send ()
-			.map_err (|e| io::Error::new (io::ErrorKind::ConnectionRefused, e))?;
-			
-			let mut cursor = std::io::Cursor::new (dest);
-			let bytes_moved = resp.copy_to (&mut cursor)
-			.map_err (|e| io::Error::new (io::ErrorKind::ConnectionReset, e))?;
-			
-			self.cursor += bytes_moved;
-			tracing::trace! ("NetReader read {} bytes", bytes_moved);
-			Ok (bytes_moved.try_into ().unwrap ())
-		}
-	}
-	
-	impl Seek for NetReader {
-		fn seek (&mut self, pos: SeekFrom) -> io::Result <u64>
-		{
-			// If your data is as big as 63 bits you'll just have
-			// to suffer I guess
-			
-			let new_cursor = match pos {
-				SeekFrom::Start (x) => x as i64,
-				SeekFrom::Current (x) => self.cursor as i64 + x,
-				SeekFrom::End (x) => self.len as i64 + x,
-			};
-			
-			let new_cursor = u64::try_from (new_cursor).map_err (|e| io::Error::new (io::ErrorKind::InvalidInput, e))?;
-			self.cursor = new_cursor;
-			
-			Ok (self.cursor)
-		}
-	}
-	
-	let client = reqwest::blocking::Client::new ();
-	let len = client.head (&url).send ()?.content_length ().ok_or_else (|| anyhow! ("Couldn't get content-length of URL"))?;
-	
-	let net_rdr = NetReader {
-		client,
-		url,
-		cursor: 0,
-		len,
-	};
-	
+	let net_rdr = net_reader::NetReader::new (url)?;
 	let buf_rdr = std::io::BufReader::new (net_rdr);
-	
 	let mut ogg_rdr = ogg::reading::PacketReader::new (buf_rdr);
 	
 	let mut packet_count = 0;
@@ -311,18 +254,7 @@ fn cmd_gui (args: &[String]) -> Result <()> {
 	
 	wind.end ();
 	wind.show ();
-	/*
-	let mut gui = Gui {
-		can_decode: false,
-		audio_is_streaming: false,
-		intend_to_play: false,
-		trying_to_stream: false,
-		but_pause,
-		but_play,
-	};
 	
-	gui.sync ();
-	*/
 	let mut shared_state = SharedState::default ();
 	let silence = vec! [0; 12_000 * 4 * 2];
 	shared_state.pcm_buffers.produce_bytes (silence);
diff --git a/src/net_reader.rs b/src/net_reader.rs
new file mode 100644
index 0000000..be3f711
--- /dev/null
+++ b/src/net_reader.rs
@@ -0,0 +1,75 @@
+use std::{
+	io::{
+		self,
+		Read,
+		Seek,
+		SeekFrom,
+	},
+};
+
+use anyhow::{
+	Result,
+	anyhow,
+};
+
+pub struct NetReader {
+	client: reqwest::blocking::Client,
+	url: String,
+	len: u64,
+	cursor: u64,
+}
+
+impl NetReader {
+	pub fn new (url: String) -> Result <Self> {
+		let client = reqwest::blocking::Client::new ();
+		let len = client.head (&url).send ()?.content_length ().ok_or_else (|| anyhow! ("Couldn't get content-length of URL"))?;
+		
+		Ok (NetReader {
+			client,
+			url,
+			cursor: 0,
+			len,
+		})
+	}
+}
+
+impl Read for NetReader {
+	fn read (&mut self, dest: &mut [u8]) -> io::Result <usize>
+	{
+		tracing::trace! ("NetReader reading {}-{}", self.cursor, self.cursor + dest.len () as u64);
+		
+		let range_hdr = format! ("bytes={}-{}", self.cursor, self.cursor + dest.len () as u64 - 1);
+		
+		let mut resp = self.client.get (&self.url)
+		.header (reqwest::header::RANGE, range_hdr)
+		.send ()
+		.map_err (|e| io::Error::new (io::ErrorKind::ConnectionRefused, e))?;
+		
+		let mut cursor = std::io::Cursor::new (dest);
+		let bytes_moved = resp.copy_to (&mut cursor)
+		.map_err (|e| io::Error::new (io::ErrorKind::ConnectionReset, e))?;
+		
+		self.cursor += bytes_moved;
+		tracing::trace! ("NetReader read {} bytes", bytes_moved);
+		Ok (bytes_moved.try_into ().unwrap ())
+	}
+}
+
+impl Seek for NetReader {
+	fn seek (&mut self, pos: SeekFrom) -> io::Result <u64>
+	{
+		// If your data is as big as 63 bits you'll just have
+		// to suffer I guess
+		
+		let new_cursor = match pos {
+			SeekFrom::Start (x) => x as i64,
+			SeekFrom::Current (x) => self.cursor as i64 + x,
+			SeekFrom::End (x) => self.len as i64 + x,
+		};
+		
+		let new_cursor = u64::try_from (new_cursor).map_err (|e| io::Error::new (io::ErrorKind::InvalidInput, e))?;
+		self.cursor = new_cursor;
+		
+		Ok (self.cursor)
+	}
+}