Merge pull request #569 from philippe44/passthrough-v3

Allow pipeline writer to spit out Ogg directly, including when seeking

.gitignore

@@ -3,4 +3,7 @@ target
 spotify_appkey.key
 .vagrant/
 .project
-.history
+.history
+*.save
+
+

Cargo.lock

@@ -1470,6 +1470,7 @@ dependencies = [
  "log 0.4.14",
  "num-bigint",
  "num-traits",
+ "ogg",
  "tempfile",
  "vorbis",
 ]

audio/Cargo.toml

@@ -17,6 +17,7 @@ byteorder = "1.3"
 bytes = "0.4"
 futures = "0.1"
 lewton = "0.10"
+ogg = "0.8"
 log = "0.4"
 num-bigint = "0.3"
 num-traits = "0.2"

audio/src/lewton_decoder.rs

@@ -2,12 +2,12 @@ extern crate lewton;
 
 use self::lewton::inside_ogg::OggStreamReader;
 
+use super::{AudioDecoder, AudioError, AudioPacket};
 use std::error;
 use std::fmt;
 use std::io::{Read, Seek};
 
 pub struct VorbisDecoder<R: Read + Seek>(OggStreamReader<R>);
-pub struct VorbisPacket(Vec<i16>);
 pub struct VorbisError(lewton::VorbisError);
 
 impl<R> VorbisDecoder<R>
@@ -17,41 +17,38 @@ where
     pub fn new(input: R) -> Result<VorbisDecoder<R>, VorbisError> {
         Ok(VorbisDecoder(OggStreamReader::new(input)?))
     }
+}
 
-    pub fn seek(&mut self, ms: i64) -> Result<(), VorbisError> {
+impl<R> AudioDecoder for VorbisDecoder<R>
+where
+    R: Read + Seek,
+{
+    fn seek(&mut self, ms: i64) -> Result<(), AudioError> {
         let absgp = ms * 44100 / 1000;
-        self.0.seek_absgp_pg(absgp as u64)?;
-        Ok(())
+        match self.0.seek_absgp_pg(absgp as u64) {
+            Ok(_) => return Ok(()),
+            Err(err) => return Err(AudioError::VorbisError(err.into())),
+        }
     }
 
-    pub fn next_packet(&mut self) -> Result<Option<VorbisPacket>, VorbisError> {
+    fn next_packet(&mut self) -> Result<Option<AudioPacket>, AudioError> {
         use self::lewton::audio::AudioReadError::AudioIsHeader;
         use self::lewton::OggReadError::NoCapturePatternFound;
         use self::lewton::VorbisError::BadAudio;
         use self::lewton::VorbisError::OggError;
         loop {
             match self.0.read_dec_packet_itl() {
-                Ok(Some(packet)) => return Ok(Some(VorbisPacket(packet))),
+                Ok(Some(packet)) => return Ok(Some(AudioPacket::Samples(packet))),
                 Ok(None) => return Ok(None),
 
                 Err(BadAudio(AudioIsHeader)) => (),
                 Err(OggError(NoCapturePatternFound)) => (),
-                Err(err) => return Err(err.into()),
+                Err(err) => return Err(AudioError::VorbisError(err.into())),
             }
         }
     }
 }
 
-impl VorbisPacket {
-    pub fn data(&self) -> &[i16] {
-        &self.0
-    }
-
-    pub fn data_mut(&mut self) -> &mut [i16] {
-        &mut self.0
-    }
-}
-
 impl From<lewton::VorbisError> for VorbisError {
     fn from(err: lewton::VorbisError) -> VorbisError {
         VorbisError(err)

audio/src/lib.rs

@@ -20,6 +20,7 @@ mod fetch;
 mod lewton_decoder;
 #[cfg(any(feature = "with-tremor", feature = "with-vorbis"))]
 mod libvorbis_decoder;
+mod passthrough_decoder;
 
 mod range_set;
 
@@ -29,8 +30,70 @@ pub use fetch::{
     READ_AHEAD_BEFORE_PLAYBACK_ROUNDTRIPS, READ_AHEAD_BEFORE_PLAYBACK_SECONDS,
     READ_AHEAD_DURING_PLAYBACK_ROUNDTRIPS, READ_AHEAD_DURING_PLAYBACK_SECONDS,
 };
+use std::fmt;
+
+pub enum AudioPacket {
+    Samples(Vec<i16>),
+    OggData(Vec<u8>),
+}
+
+impl AudioPacket {
+    pub fn samples(&self) -> &[i16] {
+        match self {
+            AudioPacket::Samples(s) => s,
+            AudioPacket::OggData(_) => panic!("can't return OggData on samples"),
+        }
+    }
+
+    pub fn oggdata(&self) -> &[u8] {
+        match self {
+            AudioPacket::Samples(_) => panic!("can't return samples on OggData"),
+            AudioPacket::OggData(d) => d,
+        }
+    }
+
+    pub fn is_empty(&self) -> bool {
+        match self {
+            AudioPacket::Samples(s) => s.is_empty(),
+            AudioPacket::OggData(d) => d.is_empty(),
+        }
+    }
+}
 
 #[cfg(not(any(feature = "with-tremor", feature = "with-vorbis")))]
-pub use crate::lewton_decoder::{VorbisDecoder, VorbisError, VorbisPacket};
+pub use crate::lewton_decoder::{VorbisDecoder, VorbisError};
 #[cfg(any(feature = "with-tremor", feature = "with-vorbis"))]
-pub use libvorbis_decoder::{VorbisDecoder, VorbisError, VorbisPacket};
+pub use libvorbis_decoder::{VorbisDecoder, VorbisError};
+pub use passthrough_decoder::{PassthroughDecoder, PassthroughError};
+
+#[derive(Debug)]
+pub enum AudioError {
+    PassthroughError(PassthroughError),
+    VorbisError(VorbisError),
+}
+
+impl fmt::Display for AudioError {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        match self {
+            AudioError::PassthroughError(err) => write!(f, "PassthroughError({})", err),
+            AudioError::VorbisError(err) => write!(f, "VorbisError({})", err),
+        }
+    }
+}
+
+impl From<VorbisError> for AudioError {
+    fn from(err: VorbisError) -> AudioError {
+        AudioError::VorbisError(VorbisError::from(err))
+    }
+}
+
+impl From<PassthroughError> for AudioError {
+    fn from(err: PassthroughError) -> AudioError {
+        AudioError::PassthroughError(PassthroughError::from(err))
+    }
+}
+
+pub trait AudioDecoder {
+    fn seek(&mut self, ms: i64) -> Result<(), AudioError>;
+    fn next_packet(&mut self) -> Result<Option<AudioPacket>, AudioError>;
+}

audio/src/libvorbis_decoder.rs

@@ -3,12 +3,12 @@ extern crate librespot_tremor as vorbis;
 #[cfg(not(feature = "with-tremor"))]
 extern crate vorbis;
 
+use super::{AudioDecoder, AudioError, AudioPacket};
 use std::error;
 use std::fmt;
 use std::io::{Read, Seek};
 
 pub struct VorbisDecoder<R: Read + Seek>(vorbis::Decoder<R>);
-pub struct VorbisPacket(vorbis::Packet);
 pub struct VorbisError(vorbis::VorbisError);
 
 impl<R> VorbisDecoder<R>
@@ -18,23 +18,28 @@ where
     pub fn new(input: R) -> Result<VorbisDecoder<R>, VorbisError> {
         Ok(VorbisDecoder(vorbis::Decoder::new(input)?))
     }
+}
 
+impl<R> AudioDecoder for VorbisDecoder<R>
+where
+    R: Read + Seek,
+{
     #[cfg(not(feature = "with-tremor"))]
-    pub fn seek(&mut self, ms: i64) -> Result<(), VorbisError> {
+    fn seek(&mut self, ms: i64) -> Result<(), AudioError> {
         self.0.time_seek(ms as f64 / 1000f64)?;
         Ok(())
     }
 
     #[cfg(feature = "with-tremor")]
-    pub fn seek(&mut self, ms: i64) -> Result<(), VorbisError> {
+    fn seek(&mut self, ms: i64) -> Result<(), AudioError> {
         self.0.time_seek(ms)?;
         Ok(())
     }
 
-    pub fn next_packet(&mut self) -> Result<Option<VorbisPacket>, VorbisError> {
+    fn next_packet(&mut self) -> Result<Option<AudioPacket>, AudioError> {
         loop {
             match self.0.packets().next() {
-                Some(Ok(packet)) => return Ok(Some(VorbisPacket(packet))),
+                Some(Ok(packet)) => return Ok(Some(AudioPacket::Samples(packet.data))),
                 None => return Ok(None),
 
                 Some(Err(vorbis::VorbisError::Hole)) => (),
@@ -44,16 +49,6 @@ where
     }
 }
 
-impl VorbisPacket {
-    pub fn data(&self) -> &[i16] {
-        &self.0.data
-    }
-
-    pub fn data_mut(&mut self) -> &mut [i16] {
-        &mut self.0.data
-    }
-}
-
 impl From<vorbis::VorbisError> for VorbisError {
     fn from(err: vorbis::VorbisError) -> VorbisError {
         VorbisError(err)
@@ -77,3 +72,9 @@ impl error::Error for VorbisError {
         error::Error::source(&self.0)
     }
 }
+
+impl From<vorbis::VorbisError> for AudioError {
+    fn from(err: vorbis::VorbisError) -> AudioError {
+        AudioError::VorbisError(VorbisError(err))
+    }
+}

audio/src/passthrough_decoder.rs

@@ -0,0 +1,191 @@
+// Passthrough decoder for librespot
+use super::{AudioDecoder, AudioError, AudioPacket};
+use ogg::{OggReadError, Packet, PacketReader, PacketWriteEndInfo, PacketWriter};
+use std::fmt;
+use std::io::{Read, Seek};
+use std::time::{SystemTime, UNIX_EPOCH};
+
+fn write_headers<T: Read + Seek>(
+    rdr: &mut PacketReader<T>,
+    wtr: &mut PacketWriter<Vec<u8>>,
+) -> Result<u32, PassthroughError> {
+    let mut stream_serial: u32 = SystemTime::now()
+        .duration_since(UNIX_EPOCH)
+        .unwrap()
+        .as_millis() as u32;
+
+    // search for ident, comment, setup
+    get_header(1, rdr, wtr, &mut stream_serial, PacketWriteEndInfo::EndPage)?;
+    get_header(
+        3,
+        rdr,
+        wtr,
+        &mut stream_serial,
+        PacketWriteEndInfo::NormalPacket,
+    )?;
+    get_header(5, rdr, wtr, &mut stream_serial, PacketWriteEndInfo::EndPage)?;
+
+    // remove un-needed packets
+    rdr.delete_unread_packets();
+    return Ok(stream_serial);
+}
+
+fn get_header<T>(
+    code: u8,
+    rdr: &mut PacketReader<T>,
+    wtr: &mut PacketWriter<Vec<u8>>,
+    stream_serial: &mut u32,
+    info: PacketWriteEndInfo,
+) -> Result<u32, PassthroughError>
+where
+    T: Read + Seek,
+{
+    let pck: Packet = rdr.read_packet_expected()?;
+
+    // set a unique serial number
+    if pck.stream_serial() != 0 {
+        *stream_serial = pck.stream_serial();
+    }
+
+    let pkt_type = pck.data[0];
+    debug!("Vorbis header type{}", &pkt_type);
+
+    // all headers are mandatory
+    if pkt_type != code {
+        return Err(PassthroughError(OggReadError::InvalidData));
+    }
+
+    // headers keep original granule number
+    let absgp_page = pck.absgp_page();
+    wtr.write_packet(
+        pck.data.into_boxed_slice(),
+        *stream_serial,
+        info,
+        absgp_page,
+    )
+    .unwrap();
+
+    return Ok(*stream_serial);
+}
+
+pub struct PassthroughDecoder<R: Read + Seek> {
+    rdr: PacketReader<R>,
+    wtr: PacketWriter<Vec<u8>>,
+    lastgp_page: Option<u64>,
+    absgp_page: u64,
+    stream_serial: u32,
+}
+
+pub struct PassthroughError(ogg::OggReadError);
+
+impl<R: Read + Seek> PassthroughDecoder<R> {
+    /// Constructs a new Decoder from a given implementation of `Read + Seek`.
+    pub fn new(rdr: R) -> Result<Self, PassthroughError> {
+        let mut rdr = PacketReader::new(rdr);
+        let mut wtr = PacketWriter::new(Vec::new());
+
+        let stream_serial = write_headers(&mut rdr, &mut wtr)?;
+        info!("Starting passthrough track with serial {}", stream_serial);
+
+        return Ok(PassthroughDecoder {
+            rdr,
+            wtr,
+            lastgp_page: Some(0),
+            absgp_page: 0,
+            stream_serial,
+        });
+    }
+}
+
+impl<R: Read + Seek> AudioDecoder for PassthroughDecoder<R> {
+    fn seek(&mut self, ms: i64) -> Result<(), AudioError> {
+        info!("Seeking to {}", ms);
+        self.lastgp_page = match ms {
+            0 => Some(0),
+            _ => None,
+        };
+
+        // hard-coded to 44.1 kHz
+        match self.rdr.seek_absgp(None, (ms * 44100 / 1000) as u64) {
+            Ok(_) => return Ok(()),
+            Err(err) => return Err(AudioError::PassthroughError(err.into())),
+        }
+    }
+
+    fn next_packet(&mut self) -> Result<Option<AudioPacket>, AudioError> {
+        let mut skip = self.lastgp_page.is_none();
+        loop {
+            let pck = match self.rdr.read_packet() {
+                Ok(Some(pck)) => pck,
+
+                Ok(None) | Err(OggReadError::NoCapturePatternFound) => {
+                    info!("end of streaming");
+                    return Ok(None);
+                }
+
+                Err(err) => return Err(AudioError::PassthroughError(err.into())),
+            };
+
+            let pckgp_page = pck.absgp_page();
+            let lastgp_page = self.lastgp_page.get_or_insert(pckgp_page);
+
+            // consume packets till next page to get a granule reference
+            if skip {
+                if *lastgp_page == pckgp_page {
+                    debug!("skipping packet");
+                    continue;
+                }
+                skip = false;
+                info!("skipped at {}", pckgp_page);
+            }
+
+            // now we can calculate absolute granule
+            self.absgp_page += pckgp_page - *lastgp_page;
+            self.lastgp_page = Some(pckgp_page);
+
+            // set packet type
+            let inf = if pck.last_in_stream() {
+                self.lastgp_page = Some(0);
+                PacketWriteEndInfo::EndStream
+            } else if pck.last_in_page() {
+                PacketWriteEndInfo::EndPage
+            } else {
+                PacketWriteEndInfo::NormalPacket
+            };
+
+            self.wtr
+                .write_packet(
+                    pck.data.into_boxed_slice(),
+                    self.stream_serial,
+                    inf,
+                    self.absgp_page,
+                )
+                .unwrap();
+
+            let data = self.wtr.inner_mut();
+
+            if data.len() > 0 {
+                let result = AudioPacket::OggData(std::mem::take(data));
+                return Ok(Some(result));
+            }
+        }
+    }
+}
+
+impl fmt::Debug for PassthroughError {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        fmt::Debug::fmt(&self.0, f)
+    }
+}
+
+impl From<ogg::OggReadError> for PassthroughError {
+    fn from(err: OggReadError) -> PassthroughError {
+        PassthroughError(err)
+    }
+}
+
+impl fmt::Display for PassthroughError {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        fmt::Display::fmt(&self.0, f)
+    }
+}

playback/src/audio_backend/alsa.rs

@@ -1,4 +1,5 @@
 use super::{Open, Sink};
+use crate::audio::AudioPacket;
 use alsa::device_name::HintIter;
 use alsa::pcm::{Access, Format, Frames, HwParams, PCM};
 use alsa::{Direction, Error, ValueOr};
@@ -124,8 +125,9 @@ impl Sink for AlsaSink {
         Ok(())
     }
 
-    fn write(&mut self, data: &[i16]) -> io::Result<()> {
+    fn write(&mut self, packet: &AudioPacket) -> io::Result<()> {
         let mut processed_data = 0;
+        let data = packet.samples();
         while processed_data < data.len() {
             let data_to_buffer = min(
                 self.buffer.capacity() - self.buffer.len(),

playback/src/audio_backend/gstreamer.rs

@@ -1,4 +1,5 @@
 use super::{Open, Sink};
+use crate::audio::AudioPacket;
 use gst::prelude::*;
 use gst::*;
 use std::sync::mpsc::{sync_channel, SyncSender};
@@ -104,9 +105,9 @@ impl Sink for GstreamerSink {
     fn stop(&mut self) -> io::Result<()> {
         Ok(())
     }
-    fn write(&mut self, data: &[i16]) -> io::Result<()> {
+    fn write(&mut self, packet: &AudioPacket) -> io::Result<()> {
         // Copy expensively (in to_vec()) to avoid thread synchronization
-        let deighta: &[u8] = data.as_bytes();
+        let deighta: &[u8] = packet.samples().as_bytes();
         self.tx
             .send(deighta.to_vec())
             .expect("tx send failed in write function");

playback/src/audio_backend/jackaudio.rs

@@ -1,4 +1,5 @@
 use super::{Open, Sink};
+use crate::audio::AudioPacket;
 use jack::{
     AsyncClient, AudioOut, Client, ClientOptions, Control, Port, ProcessHandler, ProcessScope,
 };
@@ -73,8 +74,8 @@ impl Sink for JackSink {
         Ok(())
     }
 
-    fn write(&mut self, data: &[i16]) -> io::Result<()> {
-        for s in data.iter() {
+    fn write(&mut self, packet: &AudioPacket) -> io::Result<()> {
+        for s in packet.samples().iter() {
             let res = self.send.send(*s);
             if res.is_err() {
                 error!("jackaudio: cannot write to channel");

playback/src/audio_backend/mod.rs

@@ -1,3 +1,4 @@
+use crate::audio::AudioPacket;
 use std::io;
 
 pub trait Open {
@@ -7,7 +8,7 @@ pub trait Open {
 pub trait Sink {
     fn start(&mut self) -> io::Result<()>;
     fn stop(&mut self) -> io::Result<()>;
-    fn write(&mut self, data: &[i16]) -> io::Result<()>;
+    fn write(&mut self, packet: &AudioPacket) -> io::Result<()>;
 }
 
 fn mk_sink<S: Sink + Open + 'static>(device: Option<String>) -> Box<dyn Sink> {

playback/src/audio_backend/pipe.rs

@@ -1,4 +1,5 @@
 use super::{Open, Sink};
+use crate::audio::AudioPacket;
 use std::fs::OpenOptions;
 use std::io::{self, Write};
 use std::mem;
@@ -26,12 +27,15 @@ impl Sink for StdoutSink {
         Ok(())
     }
 
-    fn write(&mut self, data: &[i16]) -> io::Result<()> {
-        let data: &[u8] = unsafe {
-            slice::from_raw_parts(
-                data.as_ptr() as *const u8,
-                data.len() * mem::size_of::<i16>(),
-            )
+    fn write(&mut self, packet: &AudioPacket) -> io::Result<()> {
+        let data: &[u8] = match packet {
+            AudioPacket::Samples(data) => unsafe {
+                slice::from_raw_parts(
+                    data.as_ptr() as *const u8,
+                    data.len() * mem::size_of::<i16>(),
+                )
+            },
+            AudioPacket::OggData(data) => data,
         };
 
         self.0.write_all(data)?;

playback/src/audio_backend/portaudio.rs

@@ -1,4 +1,5 @@
 use super::{Open, Sink};
+use crate::audio::AudioPacket;
 use portaudio_rs;
 use portaudio_rs::device::{get_default_output_index, DeviceIndex, DeviceInfo};
 use portaudio_rs::stream::*;
@@ -95,8 +96,8 @@ impl<'a> Sink for PortAudioSink<'a> {
         self.0 = None;
         Ok(())
     }
-    fn write(&mut self, data: &[i16]) -> io::Result<()> {
-        match self.0.as_mut().unwrap().write(data) {
+    fn write(&mut self, packet: &AudioPacket) -> io::Result<()> {
+        match self.0.as_mut().unwrap().write(packet.samples()) {
             Ok(_) => (),
             Err(portaudio_rs::PaError::OutputUnderflowed) => error!("PortAudio write underflow"),
             Err(e) => panic!("PA Error {}", e),

playback/src/audio_backend/pulseaudio.rs

@@ -1,4 +1,5 @@
 use super::{Open, Sink};
+use crate::audio::AudioPacket;
 use libpulse_binding::{self as pulse, stream::Direction};
 use libpulse_simple_binding::Simple;
 use std::io;
@@ -65,13 +66,17 @@ impl Sink for PulseAudioSink {
         Ok(())
     }
 
-    fn write(&mut self, data: &[i16]) -> io::Result<()> {
+    fn write(&mut self, packet: &AudioPacket) -> io::Result<()> {
         if let Some(s) = &self.s {
             // SAFETY: An i16 consists of two bytes, so that the given slice can be interpreted
             // as a byte array of double length. Each byte pointer is validly aligned, and so
             // is the newly created slice.
-            let d: &[u8] =
-                unsafe { std::slice::from_raw_parts(data.as_ptr() as *const u8, data.len() * 2) };
+            let d: &[u8] = unsafe {
+                std::slice::from_raw_parts(
+                    packet.samples().as_ptr() as *const u8,
+                    packet.samples().len() * 2,
+                )
+            };
 
             match s.write(d) {
                 Ok(_) => Ok(()),

playback/src/audio_backend/rodio.rs

@@ -1,6 +1,7 @@
 use super::{Open, Sink};
 extern crate cpal;
 extern crate rodio;
+use crate::audio::AudioPacket;
 use cpal::traits::{DeviceTrait, HostTrait};
 use std::process::exit;
 use std::{io, thread, time};
@@ -164,8 +165,8 @@ impl Sink for RodioSink {
         Ok(())
     }
 
-    fn write(&mut self, data: &[i16]) -> io::Result<()> {
-        let source = rodio::buffer::SamplesBuffer::new(2, 44100, data);
+    fn write(&mut self, packet: &AudioPacket) -> io::Result<()> {
+        let source = rodio::buffer::SamplesBuffer::new(2, 44100, packet.samples());
         self.rodio_sink.append(source);
 
         // Chunk sizes seem to be about 256 to 3000 ish items long.

playback/src/audio_backend/sdl.rs

@@ -1,4 +1,5 @@
 use super::{Open, Sink};
+use crate::audio::AudioPacket;
 use sdl2::audio::{AudioQueue, AudioSpecDesired};
 use std::{io, thread, time};
 
@@ -45,12 +46,12 @@ impl Sink for SdlSink {
         Ok(())
     }
 
-    fn write(&mut self, data: &[i16]) -> io::Result<()> {
+    fn write(&mut self, packet: &AudioPacket) -> io::Result<()> {
         while self.queue.size() > (2 * 2 * 44_100) {
             // sleep and wait for sdl thread to drain the queue a bit
             thread::sleep(time::Duration::from_millis(10));
         }
-        self.queue.queue(data);
+        self.queue.queue(packet.samples());
         Ok(())
     }
 }

playback/src/audio_backend/subprocess.rs

@@ -1,4 +1,5 @@
 use super::{Open, Sink};
+use crate::audio::AudioPacket;
 use shell_words::split;
 use std::io::{self, Write};
 use std::mem;
@@ -43,11 +44,11 @@ impl Sink for SubprocessSink {
         Ok(())
     }
 
-    fn write(&mut self, data: &[i16]) -> io::Result<()> {
+    fn write(&mut self, packet: &AudioPacket) -> io::Result<()> {
         let data: &[u8] = unsafe {
             slice::from_raw_parts(
-                data.as_ptr() as *const u8,
-                data.len() * mem::size_of::<i16>(),
+                packet.samples().as_ptr() as *const u8,
+                packet.samples().len() * mem::size_of::<i16>(),
             )
         };
         if let Some(child) = &mut self.child {

playback/src/config.rs

@@ -55,6 +55,7 @@ pub struct PlayerConfig {
     pub normalisation_type: NormalisationType,
     pub normalisation_pregain: f32,
     pub gapless: bool,
+    pub passthrough: bool,
 }
 
 impl Default for PlayerConfig {
@@ -65,6 +66,7 @@ impl Default for PlayerConfig {
             normalisation_type: NormalisationType::default(),
             normalisation_pregain: 0.0,
             gapless: true,
+            passthrough: false,
         }
     }
 }

playback/src/player.rs

@@ -15,8 +15,8 @@ use librespot_core::spotify_id::SpotifyId;
 
 use librespot_core::util::SeqGenerator;
 
+use crate::audio::{AudioDecoder, AudioError, AudioPacket, PassthroughDecoder, VorbisDecoder};
 use crate::audio::{AudioDecrypt, AudioFile, StreamLoaderController};
-use crate::audio::{VorbisDecoder, VorbisPacket};
 use crate::audio::{
     READ_AHEAD_BEFORE_PLAYBACK_ROUNDTRIPS, READ_AHEAD_BEFORE_PLAYBACK_SECONDS,
     READ_AHEAD_DURING_PLAYBACK_ROUNDTRIPS, READ_AHEAD_DURING_PLAYBACK_SECONDS,
@@ -378,7 +378,7 @@ enum PlayerPreload {
     },
 }
 
-type Decoder = VorbisDecoder<Subfile<AudioDecrypt<AudioFile>>>;
+type Decoder = Box<dyn AudioDecoder + Send>;
 
 enum PlayerState {
     Stopped,
@@ -723,7 +723,19 @@ impl PlayerTrackLoader {
 
         let audio_file = Subfile::new(decrypted_file, 0xa7);
 
-        let mut decoder = match VorbisDecoder::new(audio_file) {
+        let result = if self.config.passthrough {
+            match PassthroughDecoder::new(audio_file) {
+                Ok(result) => Ok(Box::new(result) as Decoder),
+                Err(e) => Err(AudioError::PassthroughError(e)),
+            }
+        } else {
+            match VorbisDecoder::new(audio_file) {
+                Ok(result) => Ok(Box::new(result) as Decoder),
+                Err(e) => Err(AudioError::VorbisError(e)),
+            }
+        };
+
+        let mut decoder = match result {
             Ok(decoder) => decoder,
             Err(e) if is_cached => {
                 warn!(
@@ -873,37 +885,44 @@ impl Future for PlayerInternal {
                 {
                     let packet = decoder.next_packet().expect("Vorbis error");
 
-                    if let Some(ref packet) = packet {
-                        *stream_position_pcm =
-                            *stream_position_pcm + (packet.data().len() / 2) as u64;
-                        let stream_position_millis = Self::position_pcm_to_ms(*stream_position_pcm);
+                    if !self.config.passthrough {
+                        if let Some(ref packet) = packet {
+                            *stream_position_pcm =
+                                *stream_position_pcm + (packet.samples().len() / 2) as u64;
+                            let stream_position_millis =
+                                Self::position_pcm_to_ms(*stream_position_pcm);
 
-                        let notify_about_position = match *reported_nominal_start_time {
-                            None => true,
-                            Some(reported_nominal_start_time) => {
-                                // only notify if we're behind. If we're ahead it's probably due to a buffer of the backend and we;re actually in time.
-                                let lag = (Instant::now() - reported_nominal_start_time).as_millis()
-                                    as i64
-                                    - stream_position_millis as i64;
-                                if lag > 1000 {
-                                    true
-                                } else {
-                                    false
+                            let notify_about_position = match *reported_nominal_start_time {
+                                None => true,
+                                Some(reported_nominal_start_time) => {
+                                    // only notify if we're behind. If we're ahead it's probably due to a buffer of the backend and we;re actually in time.
+                                    let lag = (Instant::now() - reported_nominal_start_time)
+                                        .as_millis()
+                                        as i64
+                                        - stream_position_millis as i64;
+                                    if lag > 1000 {
+                                        true
+                                    } else {
+                                        false
+                                    }
                                 }
+                            };
+                            if notify_about_position {
+                                *reported_nominal_start_time = Some(
+                                    Instant::now()
+                                        - Duration::from_millis(stream_position_millis as u64),
+                                );
+                                self.send_event(PlayerEvent::Playing {
+                                    track_id,
+                                    play_request_id,
+                                    position_ms: stream_position_millis as u32,
+                                    duration_ms,
+                                });
                             }
-                        };
-                        if notify_about_position {
-                            *reported_nominal_start_time = Some(
-                                Instant::now()
-                                    - Duration::from_millis(stream_position_millis as u64),
-                            );
-                            self.send_event(PlayerEvent::Playing {
-                                track_id,
-                                play_request_id,
-                                position_ms: stream_position_millis as u32,
-                                duration_ms,
-                            });
                         }
+                    } else {
+                        // position, even if irrelevant, must be set so that seek() is called
+                        *stream_position_pcm = duration_ms.into();
                     }
 
                     self.handle_packet(packet, normalisation_factor);
@@ -1085,21 +1104,23 @@ impl PlayerInternal {
         }
     }
 
-    fn handle_packet(&mut self, packet: Option<VorbisPacket>, normalisation_factor: f32) {
+    fn handle_packet(&mut self, packet: Option<AudioPacket>, normalisation_factor: f32) {
         match packet {
             Some(mut packet) => {
-                if packet.data().len() > 0 {
-                    if let Some(ref editor) = self.audio_filter {
-                        editor.modify_stream(&mut packet.data_mut())
-                    };
+                if !packet.is_empty() {
+                    if let AudioPacket::Samples(ref mut data) = packet {
+                        if let Some(ref editor) = self.audio_filter {
+                            editor.modify_stream(data)
+                        }
 
-                    if self.config.normalisation && normalisation_factor != 1.0 {
-                        for x in packet.data_mut().iter_mut() {
-                            *x = (*x as f32 * normalisation_factor) as i16;
+                        if self.config.normalisation && normalisation_factor != 1.0 {
+                            for x in data.iter_mut() {
+                                *x = (*x as f32 * normalisation_factor) as i16;
+                            }
                         }
                     }
 
-                    if let Err(err) = self.sink.write(&packet.data()) {
+                    if let Err(err) = self.sink.write(&packet) {
                         error!("Could not write audio: {}", err);
                         self.ensure_sink_stopped(false);
                     }

src/main.rs

@@ -204,6 +204,11 @@ fn setup(args: &[String]) -> Setup {
             "",
             "disable-gapless",
             "disable gapless playback.",
+        )
+	    .optflag(
+            "",
+            "passthrough",
+            "Pass raw stream to output, only works for \"pipe\"."
         );
 
     let matches = match opts.parse(&args[1..]) {
@@ -354,6 +359,8 @@ fn setup(args: &[String]) -> Setup {
         }
     };
 
+    let passthrough = matches.opt_present("passthrough");
+
     let player_config = {
         let bitrate = matches
             .opt_str("b")
@@ -376,6 +383,7 @@ fn setup(args: &[String]) -> Setup {
                 .opt_str("normalisation-pregain")
                 .map(|pregain| pregain.parse::<f32>().expect("Invalid pregain float value"))
                 .unwrap_or(PlayerConfig::default().normalisation_pregain),
+            passthrough,
         }
     };