From 61042c26faee164b51dda27561c9b67b34af8d9a Mon Sep 17 00:00:00 2001
From: Nathan Perry <avaglir@gmail.com>
Date: Fri, 15 Feb 2019 22:59:40 -0500
Subject: initial implementation of video start/end times

---
 src/commands/playback/types.rs | 121 ++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 119 insertions(+), 2 deletions(-)

(limited to 'src/commands/playback/types.rs')

diff --git a/src/commands/playback/types.rs b/src/commands/playback/types.rs
index 63479fd..380ee9d 100644
--- a/src/commands/playback/types.rs
+++ b/src/commands/playback/types.rs
@@ -5,12 +5,13 @@ use std::{
     time::Duration,
 };
 
+use chrono::Duration as CDuration;
 use either::{Either, Left, Right};
 use serenity::{
     client::bridge::voice::ClientVoiceManager,
     model::id::ChannelId,
     prelude::*,
-    voice::{LockedAudio, ytdl},
+    voice::{LockedAudio},
 };
 use typemap::Key;
 
@@ -41,6 +42,8 @@ pub struct PlayArgs {
     pub data: Either<String, Vec<u8>>,
     pub initiator: String,
     pub sender_channel: ChannelId,
+    pub start: Option<CDuration>,
+    pub end: Option<CDuration>,
 }
 
 #[derive(Clone)]
@@ -119,7 +122,7 @@ impl PlayQueue {
 
                 let src = match item.data {
                     Left(ref url) => {
-                        match ytdl(url) {
+                        match ytdl(url, item.start, item.end) {
                             Ok(src) => src,
                             Err(e) => {
                                 error!("bad link: {}; {:?}", url, e);
@@ -160,3 +163,117 @@ impl PlayQueue {
         });
     }
 }
+
+use std::{
+    io::{
+        Read,
+        Result as IoResult,
+        BufReader,
+    },
+    process::{
+        Command,
+        Stdio,
+        Child,
+    }
+};
+
+use serenity::{
+    voice::{
+        AudioSource,
+        pcm,
+    }
+};
+use serde_json::Value;
+use crate::Result;
+
+struct ChildContainer(Child);
+
+impl Read for ChildContainer {
+    fn read(&mut self, buffer: &mut [u8]) -> IoResult<usize> {
+        self.0.stdout.as_mut().unwrap().read(buffer)
+    }
+}
+
+impl Drop for ChildContainer {
+    fn drop (&mut self) {
+        if let Err(e) = self.0.kill() {
+            debug!("[Voice] Error awaiting child process: {:?}", e);
+        }
+    }
+}
+
+
+// Copied from serenity
+pub fn ytdl(uri: &str, start: Option<CDuration>, end: Option<CDuration>) -> 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(VoiceError::YouTubeDLRun(out).into());
+    }
+
+    let value = serde_json::from_reader(&out.stdout[..])?;
+    let mut obj = match value {
+        Value::Object(obj) => obj,
+        other => return Err(VoiceError::YouTubeDLProcessing(other).into()),
+    };
+
+    let uri = match obj.remove("url") {
+        Some(v) => match v {
+            Value::String(uri) => uri,
+            other => return Err(VoiceError::YouTubeDLUrl(other).into()),
+        },
+        None => return Err(VoiceError::YouTubeDLUrl(Value::Object(obj)).into()),
+    };
+
+    let start = start.unwrap_or(CDuration::zero());
+    let start_str = format!("{:02}:{:02}:{:02}", start.num_hours(), start.num_minutes() % 60, start.num_seconds() % 60);
+
+    let mut opts = vec! [
+        "-f",
+        "s16le",
+        "-ac",
+        "2", // force stereo -- this may cause issues
+        "-ar",
+        "48000",
+        "-acodec",
+        "pcm_s16le",
+        "-ss",
+        &start_str,
+    ]
+        .into_iter()
+        .map(|s| s.to_owned())
+        .collect::<Vec<_>>();
+
+    match end {
+        Some(e) => {
+            opts.push("-to".to_owned());
+            opts.push(format!("{:02}:{:02}:{:02}", e.num_hours(), e.num_minutes() % 60, e.num_seconds() % 60));
+        },
+        _ => {},
+    }
+
+    opts.push("-".to_owned());
+
+    let command = Command::new("ffmpeg")
+        .arg("-i")
+        .arg(uri)
+        .args(opts)
+        .stderr(Stdio::null())
+        .stdin(Stdio::null())
+        .stdout(Stdio::piped())
+        .spawn()?;
+
+    Ok(pcm(true, ChildContainer(command)))
+}
-- 
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