fixed some logic and added autoscaling option

Cargo.lock

@@ -264,7 +264,7 @@ dependencies = [
 
 [[package]]
 name = "srtune"
-version = "0.1.0"
+version = "0.2.0"
 dependencies = [
  "clap 2.33.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "env_logger 0.6.1 (registry+https://github.com/rust-lang/crates.io-index)",

Cargo.toml

@@ -1,11 +1,10 @@
 [package]
 name = "srtune"
-version = "0.1.0"
+version = "0.2.0"
 authors = ["Ondřej Hruška <ondra@ondrovo.com>"]
 edition = "2018"
 
 [dependencies]
-#srt = "0.1.0"
 clap = "2.33.0"
 log = "0.4"
 failure = "0.1.5"

src/main.rs

@@ -10,8 +10,9 @@ use std::io;
 use std::str::FromStr;
 use std::convert::TryFrom;
 use std::io::BufRead;
-use std::ops::{Add, Mul, MulAssign, AddAssign};
+use std::ops::{Add, Mul, MulAssign, AddAssign, SubAssign, Sub};
 use std::fmt::{self, Display};
+use serde::export::fmt::Debug;
 
 const LOG_LEVELS: [&str; 5] = ["error", "warn", "info", "debug", "trace"];
 const SPAMMY_LIBS: [&str; 5] = ["tokio_reactor", "hyper", "reqwest", "mio", "want"];
@@ -22,7 +23,7 @@ fn main() {
             .version(env!("CARGO_PKG_VERSION"))
             .arg(clap::Arg::with_name("input")
                      .value_name("INFILE")
-                     .help("Input file, -- for stdin"),
+                     .help("Input file, leave out for stdin"),
             )
             .arg(clap::Arg::with_name("output")
                      .short("o")
@@ -30,29 +31,52 @@ fn main() {
                      .value_name("OUTFILE")
                      .help("Output file, defaults to stdout"),
             )
-            .arg(clap::Arg::with_name("from")
+            .arg(clap::Arg::with_name("fromtime")
                      .short("f")
-                     .long("from")
+                     .long("from-time")
-                     .value_name("FROM")
+                     .value_name("TIME")
-                     .help("Index of the first affected entry, defaults to 0. With '--renumber', the original numbers are used."),
+                     .help("Time of the first affected entry, defaults to 0. Use seconds, M:S or \
+                     H:M:S, decimals are supported. Uses the original times before any shifts or \
+                     scaling."),
+            )
+            .arg(clap::Arg::with_name("fromindex")
+                     .short("F")
+                     .long("from-index")
+                     .value_name("INDEX")
+                     .help("Time of the first affected entry, defaults to 0. Use seconds, M:S or \
+                     H:M:S, decimals are supported. Uses the original times before any shifts or \
+                     scaling."),
             )
             .arg(clap::Arg::with_name("move")
                      .short("m")
                      .long("move")
-                     .value_name("SECS")
+                     .value_name("TIME")
-                     .help("Time shift, accepts positive or negative float"),
+                     .help("Move subtitles in time. Use seconds, M:S or H:M:S, decimals and minus \
+                     are supported."),
             )
             .arg(clap::Arg::with_name("scale")
                      .short("s")
                      .long("scale")
                      .value_name("RATIO")
-                     .help("Scale subtitle times and durations to compensate for bitrate differences.\nIf a start time was given, the scaling is relative to this point, otherwise to the first subtitle in the file."),
+                     .help("Scale subtitle times and durations to compensate for bitrate \
+                     differences. 1 means identity, 1.1 makes all times 10% longer. If a start \
+                     time was given, the scaling is relative to this point, otherwise to the first \
+                     subtitle in the file. Has no effect if '--autoscale' is used."),
+            )
+            .arg(clap::Arg::with_name("autoscale")
+                     .short("S")
+                     .long("autoscale")
+                     .value_name("SUBTIME=VIDEOTIME")
+                     .help("Calculate scaling based on a perceived difference. The scaling is \
+                     related to the first subtitle, so ensure it is aligned properly with '--move'."),
             )
             .arg(clap::Arg::with_name("durscale")
                      .short("d")
                      .long("durscale")
                      .value_name("RATIO")
-                     .help("Scale durations, can be combined with '--scale'"),
+                     .help("Scale durations, can be combined with '--scale' or '--autoscale'. The \
+                     given value will always be multiplied by the absolute time scale. 1 means \
+                     identity, 1.1 makes all times 10% longer."),
             )
             .arg(clap::Arg::with_name("renumber")
                      .short("r")
@@ -93,12 +117,62 @@ fn main() {
     }
     builder.init();
 
+    let from_time = match argv.value_of("fromtime") {
+        Some(s) => {
+            SubDuration::try_from(s).expect("Bad --from-time format").as_instant()
+        }
+        None => SubInstant(0f32)
+    };
+
+    let from_index = match argv.value_of("fromindex") {
+        Some(s) => {
+            s.parse().expect("Bad --from-index format")
+        }
+        None => 0u32
+    };
+
+    let shift = match argv.value_of("move") {
+        Some(s) => {
+            SubDuration::try_from(s).expect("Bad --move format")
+        }
+        None => SubDuration(0f32)
+    };
+
+    let scale = match argv.value_of("scale") {
+        Some(s) => {
+            s.parse().expect("Bad --scale format")
+        }
+        None => 1f32
+    };
+
+    let durscale = match argv.value_of("durscale") {
+        Some(s) => {
+            s.parse().expect("Bad --durscale format")
+        }
+        None => 1f32
+    }; // always also shrink durations
+
+    let autoscale = match argv.value_of("autoscale") {
+        Some(s) => {
+            let halves : Vec<&str> = s.split("=").collect();
+            if halves.len() != 2 {
+                panic!("Bad --autoscale format, should be SUBTIME=VIDEOTIME")
+            }
+            let (first, second) = (halves[0], halves[1]);
+            let subtime = SubDuration::try_from(first).expect("Bad --autoscale format").as_instant();
+            let vidtime = SubDuration::try_from(second).expect("Bad --autoscale format").as_instant();
+
+            Some((subtime, vidtime))
+        }
+        None => None
+    };
+
     let inf = argv.value_of("input");
     let outf = argv.value_of("output");
     let stdin = io::stdin();
     let stdout = io::stdout();
 
-    let mut iter: Box<dyn Iterator<Item=Result<String, io::Error>>> = match inf {
+    let mut lines_iterator: Box<dyn Iterator<Item=Result<String, io::Error>>> = match inf {
         None => {
             Box::new(stdin.lock().lines())
         }
@@ -108,7 +182,7 @@ fn main() {
         }
     };
 
-    let mut out : Box<dyn Write> = match outf {
+    let mut outfile: Box<dyn Write> = match outf {
         None => {
             Box::new(stdout.lock())
         }
@@ -123,44 +197,41 @@ fn main() {
         }
     };
 
-    let from_s = match argv.value_of("from") {
-        Some(s) => {
-            s.parse().expect("Bad --from format")
-        },
-        None => 0u32
-    };
-
-    let move_s = match argv.value_of("move") {
-        Some(s) => {
-            s.parse().expect("Bad --move format")
-        },
-        None => 0f32
-    };
-
-    let scale_s = match argv.value_of("scale") {
-        Some(s) => {
-            s.parse().expect("Bad --scale format")
-        },
-        None => 1f32
-    };
-
-    let durscale_s = match argv.value_of("durscale") {
-        Some(s) => {
-            s.parse().expect("Bad --durscale format")
-        },
-        None => 1f32
-    } * scale_s; // always also shrink durations
-
     let renumber = argv.is_present("renumber");
 
-    info!("Opts: from #{}, move {}s, scale {}x, durscale {}x", from_s, move_s, scale_s, durscale_s);
+    transform_subtitles(&mut lines_iterator, &mut outfile, TransformOpts {
+        renumber,
+        autoscale,
+        durscale,
+        scale,
+        shift,
+        from_index,
+        from_time,
+    });
+}
 
-    let mut scale_start = SubTime(0f32);
+#[derive(Debug)]
+struct TransformOpts {
+    renumber: bool,
+    autoscale: Option<(SubInstant, SubInstant)>,
+    durscale: f32,
+    scale: f32,
+    shift: SubDuration,
+    from_index: u32,
+    from_time: SubInstant,
+}
+
+fn transform_subtitles<'a>(lines : &mut Box<dyn Iterator<Item=Result<String, io::Error>> + 'a>,
+                       outfile : &mut Box<dyn Write + 'a>,
+                       mut opts : TransformOpts) {
+    debug!("Opts: {:#?}", opts);
+
+    let mut start_time = SubInstant(0f32);
     let mut first_found = false;
-    let mut renumber_i : u32 = 0;
+    let mut renumber_i: u32 = 0;
 
-    let mut text = vec![];
+    let mut linebuf = vec![];
-    while let Some(Ok(x)) = iter.next() {
+    while let Some(Ok(x)) = lines.next() {
         let mut x = x.trim();
         if x.starts_with('\u{feff}') {
             debug!("Stripping BOM mark");
@@ -178,55 +249,75 @@ fn main() {
         match u32::from_str(x) {
             Ok(num) => {
                 // println!("Entry {}", num);
-                let datesrow = iter.next().unwrap().unwrap();
+                let datesrow = lines.next().unwrap().unwrap();
                 if datesrow.contains(" --> ") {
                     let mut halves = datesrow.split(" --> ");
                     let (first, second) = (halves.next().unwrap(), halves.next().unwrap());
-                    let start = SubTime::try_from(first).unwrap();
+                    let start = SubInstant::try_from(first).unwrap();
-                    let end = SubTime::try_from(second).unwrap();
+                    let end = SubInstant::try_from(second).unwrap();
 
-                    text.clear();
+                    linebuf.clear();
-                    while let Some(Ok(x)) = iter.next() {
+                    while let Some(Ok(x)) = lines.next() {
                         if x.is_empty() {
                             break; // space between the entries
                         }
-                        text.push(x);
+                        linebuf.push(x);
                     }
 
-                    let mut one = Subtitle {
+                    let mut subtitle = Subtitle {
                         num,
                         start,
                         dur: SubDuration(end.0 - start.0),
-                        text: text.join("\n"),
+                        text: linebuf.join("\n"),
                     };
 
-                    if num >= from_s {
+                    if start >= opts.from_time && num >= opts.from_index {
                         if !first_found {
-                            debug!("Scaling anchored at {} (#{}), start edits", start, num);
+                            debug!("Scaling anchored at {} (#{}), editing starts", start, num);
-                            scale_start = start;
+                            debug!("Shifting by: {}", opts.shift);
+
+                            start_time = start;
                             first_found = true;
+
+                            if let Some((mut subt, mut vidt)) = opts.autoscale {
+                                debug!("Autoscale: VT {} -> ST {}", vidt, subt);
+                                subt -= start_time;
+                                vidt -= start_time + opts.shift;
+                                if subt.0 <= 0f32 {
+                                    panic!("Error in autoscale, start time is negative or zero.");
+                                }
+                                if vidt.0 <= 0f32 {
+                                    panic!("Error in autoscale, end time is negative or zero.");
+                                }
+                                debug!("  relative to #{}, after \"move\": VT {} -> ST {}", num, vidt, subt);
+                                opts.scale = vidt.0 / subt.0;
+                                debug!("Resolved scale as {}", opts.scale);
+                            }
+
+                            opts.durscale *= opts.scale;
+                            debug!("Duration scaling is {}", opts.durscale);
                         }
 
-                        if scale_s != 1f32 {
+                        if opts.scale != 1f32 {
-                            one.start = one.start.scale(scale_start, scale_s);
+                            subtitle.start = subtitle.start.scale(start_time, opts.scale);
                         }
 
-                        one.dur *= durscale_s;
+                        subtitle.dur *= opts.durscale;
-                        one.start += move_s;
+                        subtitle.start += opts.shift;
                     }
 
-                    if one.start.0 < 0f32 {
+                    if subtitle.start.0 < 0f32 {
-                        warn!("Discarding negative time entry #{} @ {:.3}s", one.num, one.start.0);
+                        warn!("Discarding negative time entry #{} @ {:.3}s", subtitle.num, subtitle.start.0);
                         continue;
                     }
 
                     // advance numbering only for the really emitted entries
-                    if renumber {
+                    if opts.renumber {
                         renumber_i += 1;
-                        one.num = renumber_i;
+                        subtitle.num = renumber_i;
                     }
 
-                    out.write(one.to_string().as_bytes()).expect("failed to write");
+                    outfile.write(subtitle.to_string().as_bytes()).expect("failed to write");
                 }
             }
             Err(e) => {
@@ -239,20 +330,46 @@ fn main() {
         }
     }
 
-    out.flush().unwrap();
+    outfile.flush().unwrap();
 }
 
-#[derive(Copy, Clone, Debug)]
+#[derive(Copy, Clone, PartialEq, PartialOrd)]
-struct SubTime(f32);
+struct SubInstant(f32);
 
-#[derive(Copy, Clone, Debug)]
+impl Debug for SubInstant {
+    fn fmt(&self, f: &mut fmt::Formatter) -> Result<(), fmt::Error> {
+        write!(f, "Time({})", self)
+    }
+}
+
+#[derive(Copy, Clone, PartialEq, PartialOrd)]
 struct SubDuration(f32);
 
-impl Add<SubDuration> for SubTime {
+impl Debug for SubDuration {
-    type Output = SubTime;
+    fn fmt(&self, f: &mut fmt::Formatter) -> Result<(), fmt::Error> {
+        write!(f, "Duration({})", self)
+    }
+}
+
+impl Display for SubDuration {
+    fn fmt(&self, f: &mut fmt::Formatter) -> Result<(), fmt::Error> {
+        write!(f, "{}", SubInstant(self.0))
+    }
+}
+
+impl Add<SubDuration> for SubInstant {
+    type Output = SubInstant;
 
     fn add(self, rhs: SubDuration) -> Self::Output {
-        SubTime(self.0 + rhs.0)
+        SubInstant(self.0 + rhs.0)
+    }
+}
+
+impl Sub<SubDuration> for SubInstant {
+    type Output = SubInstant;
+
+    fn sub(self, rhs: SubDuration) -> Self::Output {
+        SubInstant(self.0 - rhs.0)
     }
 }
 
@@ -276,36 +393,63 @@ impl AddAssign<f32> for SubDuration {
     }
 }
 
-impl SubTime {
+impl SubInstant {
     /// Scale by a factor with a custom start time
-    pub fn scale(&self, start : SubTime, factor : f32) -> SubTime {
+    pub fn scale(&self, start: SubInstant, factor: f32) -> SubInstant {
-        SubTime(start.0 + (self.0 - start.0) * factor)
+        SubInstant(start.0 + (self.0 - start.0) * factor)
     }
 }
 
-impl AddAssign<f32> for SubTime {
+impl AddAssign<f32> for SubInstant {
     fn add_assign(&mut self, rhs: f32) {
         self.0 += rhs;
     }
 }
 
-impl Display for SubTime {
+impl AddAssign<SubInstant> for SubInstant {
+    fn add_assign(&mut self, rhs: SubInstant) {
+        self.0 += rhs.0;
+    }
+}
+
+impl SubAssign<SubInstant> for SubInstant {
+    fn sub_assign(&mut self, rhs: SubInstant) {
+        self.0 -= rhs.0;
+    }
+}
+
+impl SubAssign<SubDuration> for SubInstant {
+    fn sub_assign(&mut self, rhs: SubDuration) {
+        self.0 -= rhs.0;
+    }
+}
+
+impl AddAssign<SubDuration> for SubInstant {
+    fn add_assign(&mut self, rhs: SubDuration) {
+        self.0 += rhs.0;
+    }
+}
+
+impl Display for SubInstant {
     fn fmt(&self, f: &mut fmt::Formatter) -> Result<(), fmt::Error> {
         // TODO optimize this
-        let mut secs = self.0;
+        let sign = self.0.signum();
+        let mut secs = self.0.abs();
         let hours = (secs / 3600f32).floor();
         secs -= hours * 3600f32;
         let minutes = (secs / 60f32).floor();
         secs -= minutes * 60f32;
-        let msecs = ((secs % 1f32)*1000f32).round();
+        let msecs = ((secs % 1f32) * 1000f32).round();
-        write!(f, "{:02}:{:02}:{:02},{:03}", hours, minutes, secs.floor(), msecs)
+        write!(f, "{}{:02}:{:02}:{:02},{:03}",
+               if sign.is_sign_negative() { "-" } else { "" },
+               hours, minutes, secs.floor(), msecs)
     }
 }
 
 #[derive(Clone, Debug)]
 struct Subtitle {
     num: u32,
-    start: SubTime,
+    start: SubInstant,
     dur: SubDuration,
     text: String,
 }
@@ -320,23 +464,103 @@ impl Display for Subtitle {
     }
 }
 
-lazy_static! {
-    static ref DATE_RE: Regex = Regex::new(r"(\d+):(\d+):(\d+),(\d+)").unwrap();
-}
 
-impl TryFrom<&str> for SubTime {
+impl TryFrom<&str> for SubInstant {
     type Error = failure::Error;
 
     fn try_from(value: &str) -> Result<Self, Self::Error> {
+        lazy_static! {
+            static ref DATE_RE: Regex = Regex::new(r"^(-)?(?P<h>\d+):(?P<m>\d+):(?P<s>\d+(:?[,.]\d+)?)$").unwrap();
+        }
+
         match DATE_RE.captures(value) {
             Some(caps) => {
-                Ok(SubTime(f32::from_str(caps.get(1).unwrap().as_str()).unwrap() * 3600f32 +
+                let minus = if caps.get(1).is_some() { -1f32 } else { 1f32 };
-                    f32::from_str(caps.get(2).unwrap().as_str()).unwrap() * 60f32 +
+
-                    f32::from_str(caps.get(3).unwrap().as_str()).unwrap() +
+                let h = &caps["h"];
-                    f32::from_str(caps.get(4).unwrap().as_str()).unwrap() * 0.001f32))
+                let m = &caps["m"];
+                let s = caps["s"].replace(",", ".");
+
+                Ok(SubInstant(minus * (f32::from_str(h).unwrap() * 3600f32 +
+                    f32::from_str(m).unwrap() * 60f32 +
+                    f32::from_str(&s).unwrap())))
             }
             None => Err(failure::err_msg("Error parsing time."))
         }
     }
 }
 
+impl SubDuration {
+    pub fn as_instant(&self) -> SubInstant {
+        SubInstant(self.0)
+    }
+}
+
+impl TryFrom<&str> for SubDuration {
+    type Error = failure::Error;
+
+    fn try_from(value: &str) -> Result<Self, Self::Error> {
+        lazy_static! {
+            static ref TIME_RE: Regex = Regex::new(r"^(-)?(?:(\d+):)?(?:(\d+):)?(\d+(?:[,.]\d+)?)$").unwrap();
+        }
+
+        match TIME_RE.captures(value) {
+            Some(caps) => {
+                let minus = if caps.get(1).is_some() { -1f32 } else { 1f32 };
+                let a = caps.get(2).map(|m| m.as_str()).unwrap_or("");
+                let b = caps.get(3).map(|m| m.as_str()).unwrap_or("");
+                let s = caps.get(4).map(|m| m.as_str()).unwrap_or("0").replace(",", ".");
+
+                let (h, m) = if b.is_empty() {
+                    ("0", if a.is_empty() { "0" } else { a })
+                } else {
+                    (a, b)
+                };
+
+                Ok(SubDuration(minus * (f32::from_str(h).unwrap() * 3600f32 +
+                    f32::from_str(m).unwrap() * 60f32 +
+                    f32::from_str(&s).unwrap())))
+            }
+            None => Err(failure::err_msg("Error parsing time: No match"))
+        }
+    }
+}
+
+#[test]
+fn test_parse_duration() {
+    // this is used for user input on the command line
+    let bad = SubDuration(-1f32);
+    assert_eq!(SubDuration(45678f32), SubDuration::try_from("45678").unwrap_or(bad), "integer secs");
+    assert_eq!(SubDuration(1.23f32), SubDuration::try_from("1.23").unwrap_or(bad), "float secs with period");
+    assert_eq!(SubDuration(-1.23f32), SubDuration::try_from("-1.23").unwrap_or(bad), "MINUS float secs with period");
+    assert_eq!(SubDuration(1.23f32), SubDuration::try_from("1,23").unwrap_or(bad), "float secs with comma");
+    assert_eq!(SubDuration(121.15f32), SubDuration::try_from("2:1.15").unwrap_or(bad), "m:s.frac");
+    assert_eq!(SubDuration(121.15f32), SubDuration::try_from("2:01.15").unwrap_or(bad), "m:0s.frac");
+    assert_eq!(SubDuration(121.15f32), SubDuration::try_from("02:01.15").unwrap_or(bad), "0m:0s.frac");
+    assert_eq!(SubDuration(121.15f32), SubDuration::try_from("02:01,15").unwrap_or(bad), "0m:0s,frac");
+
+    assert_eq!(SubDuration(3721.15f32), SubDuration::try_from("1:02:01,15").unwrap_or(bad), "h:0m:0s,frac");
+    assert_eq!(SubDuration(3721.15f32), SubDuration::try_from("1:02:01,15").unwrap_or(bad), "h:0m:0s.frac");
+    assert_eq!(SubDuration(3721.15f32), SubDuration::try_from("01:02:01,15").unwrap_or(bad), "0h:0m:0s,frac");
+    assert_eq!(SubDuration(-3721.15f32), SubDuration::try_from("-01:02:01,15").unwrap_or(bad), "-0h:0m:0s,frac");
+}
+
+#[test]
+fn test_parse_instant() {
+    let bad = SubInstant(-1f32);
+    assert_eq!(SubInstant(1081.755f32), SubInstant::try_from("00:18:01,755").unwrap_or(bad));
+    assert_eq!(SubInstant(1081.755f32), SubInstant::try_from("00:18:01.755").unwrap_or(bad));
+    assert_eq!(SubInstant(1081.7f32), SubInstant::try_from("00:18:01.7").unwrap_or(bad));
+    assert_eq!(SubInstant(1081.7f32), SubInstant::try_from("0:18:1.7").unwrap_or(bad));
+    assert_eq!(SubInstant(0f32), SubInstant::try_from("00:00:00,000").unwrap_or(bad));
+    assert_eq!(SubInstant(-3600f32), SubInstant::try_from("-01:00:00,000").unwrap_or(bad));
+}
+
+#[test]
+fn test_stringify_instant() {
+    assert_eq!("00:18:01,755", SubInstant::try_from("00:18:01,755").unwrap().to_string());
+    assert_eq!("-00:18:01,755", SubInstant::try_from("-00:18:01,755").unwrap().to_string());
+    assert_eq!("-00:18:01,700", SubInstant::try_from("-00:18:01.7").unwrap().to_string());
+    assert_eq!("00:00:00,000", SubInstant::try_from("00:00:00,000").unwrap().to_string());
+    assert_eq!("-00:00:00,000", SubInstant::try_from("-00:00:00,000").unwrap().to_string());
+}