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use byteorder::{LittleEndian, ReadBytesExt};
use serde_json;
use std::ffi::OsStr;
use std::io::{BufReader, ErrorKind as IoErrorKind, Read, Result as IoResult};
use std::process::{Child, Command, Stdio};
use super::{AudioSource, AudioType, DcaError, DcaMetadata, VoiceError};
use internal::prelude::*;
use std::fs::File;
use std::result::Result as StdResult;
struct ChildContainer(Child);
impl Read for ChildContainer {
fn read(&mut self, buffer: &mut [u8]) -> IoResult<usize> {
self.0.stdout.as_mut().unwrap().read(buffer)
}
}
struct InputSource<R: Read + Send + 'static> {
stereo: bool,
reader: R,
kind: AudioType,
}
impl<R: Read + Send> AudioSource for InputSource<R> {
fn is_stereo(&mut self) -> bool { self.stereo }
fn get_type(&self) -> AudioType { self.kind.clone() }
fn read_pcm_frame(&mut self, buffer: &mut [i16]) -> Option<usize> {
for (i, v) in buffer.iter_mut().enumerate() {
*v = match self.reader.read_i16::<LittleEndian>() {
Ok(v) => v,
Err(ref e) => {
return if e.kind() == IoErrorKind::UnexpectedEof {
Some(i)
} else {
None
}
},
}
}
Some(buffer.len())
}
fn read_opus_frame(&mut self) -> Option<Vec<u8>> {
match self.reader.read_i16::<LittleEndian>() {
Ok(size) => {
if size <= 0 {
warn!("Invalid opus frame size: {}", size);
return None;
}
let mut frame = Vec::with_capacity(size as usize);
{
let reader = self.reader.by_ref();
if reader.take(size as u64).read_to_end(&mut frame).is_err() {
return None;
}
}
Some(frame)
},
Err(ref e) => if e.kind() == IoErrorKind::UnexpectedEof {
Some(Vec::new())
} else {
None
},
}
}
}
/// Opens an audio file through `ffmpeg` and creates an audio source.
pub fn ffmpeg<P: AsRef<OsStr>>(path: P) -> Result<Box<AudioSource>> {
let path = path.as_ref();
// Will fail if the path is not to a file on the fs. Likely a YouTube URI.
let is_stereo = is_stereo(path).unwrap_or(false);
let stereo_val = if is_stereo { "2" } else { "1" };
let args = [
"-f",
"s16le",
"-ac",
stereo_val,
"-ar",
"48000",
"-acodec",
"pcm_s16le",
"-",
];
let command = Command::new("ffmpeg")
.arg("-i")
.arg(path)
.args(&args)
.stderr(Stdio::null())
.stdin(Stdio::null())
.stdout(Stdio::piped())
.spawn()?;
Ok(pcm(is_stereo, ChildContainer(command)))
}
/// Creates a streamed audio source from a DCA file.
/// Currently only accepts the DCA1 format.
pub fn dca<P: AsRef<OsStr>>(path: P) -> StdResult<Box<AudioSource>, DcaError> {
let file = File::open(path.as_ref()).map_err(DcaError::IoError)?;
let mut reader = BufReader::new(file);
let mut header = [0u8; 4];
// Read in the magic number to verify it's a DCA file.
reader.read_exact(&mut header).map_err(DcaError::IoError)?;
if header != b"DCA1"[..] {
return Err(DcaError::InvalidHeader);
}
reader.read_exact(&mut header).map_err(DcaError::IoError)?;
let size = (&header[..]).read_i32::<LittleEndian>().unwrap();
// Sanity check
if size < 2 {
return Err(DcaError::InvalidSize(size));
}
let mut raw_json = Vec::with_capacity(size as usize);
{
let json_reader = reader.by_ref();
json_reader
.take(size as u64)
.read_to_end(&mut raw_json)
.map_err(DcaError::IoError)?;
}
let metadata = serde_json::from_slice::<DcaMetadata>(raw_json.as_slice())
.map_err(DcaError::InvalidMetadata)?;
Ok(opus(metadata.is_stereo(), reader))
}
/// Creates an Opus audio source.
pub fn opus<R: Read + Send + 'static>(is_stereo: bool, reader: R) -> Box<AudioSource> {
Box::new(InputSource {
stereo: is_stereo,
reader: reader,
kind: AudioType::Opus,
})
}
/// Creates a PCM audio source.
pub fn pcm<R: Read + Send + 'static>(is_stereo: bool, reader: R) -> Box<AudioSource> {
Box::new(InputSource {
stereo: is_stereo,
reader: reader,
kind: AudioType::Pcm,
})
}
/// Creates a streamed audio source with `youtube-dl` and `ffmpeg`.
pub fn ytdl(uri: &str) -> Result<Box<AudioSource>> {
let args = [
"-f",
"webm[abr>0]/bestaudio/best",
"--no-playlist",
"--print-json",
"--skip-download",
uri,
];
let out = Command::new("youtube-dl")
.args(&args)
.stdin(Stdio::null())
.output()?;
if !out.status.success() {
return Err(Error::Voice(VoiceError::YouTubeDLRun(out)));
}
let value = serde_json::from_reader(&out.stdout[..])?;
let mut obj = match value {
Value::Object(obj) => obj,
other => return Err(Error::Voice(VoiceError::YouTubeDLProcessing(other))),
};
let uri = match obj.remove("url") {
Some(v) => match v {
Value::String(uri) => uri,
other => return Err(Error::Voice(VoiceError::YouTubeDLUrl(other))),
},
None => return Err(Error::Voice(VoiceError::YouTubeDLUrl(Value::Object(obj)))),
};
ffmpeg(&uri)
}
fn is_stereo(path: &OsStr) -> Result<bool> {
let args = ["-v", "quiet", "-of", "json", "-show-streams", "-i"];
let out = Command::new("ffprobe")
.args(&args)
.arg(path)
.stdin(Stdio::null())
.output()?;
let value: Value = serde_json::from_reader(&out.stdout[..])?;
let streams = value
.as_object()
.and_then(|m| m.get("streams"))
.and_then(|v| v.as_array())
.ok_or(Error::Voice(VoiceError::Streams))?;
let check = streams.iter().any(|stream| {
let channels = stream
.as_object()
.and_then(|m| m.get("channels").and_then(|v| v.as_i64()));
channels == Some(2)
});
Ok(check)
}
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