diff options
| -rw-r--r-- | .gitignore | 2 | ||||
| -rw-r--r-- | Cargo.lock | 343 | ||||
| -rw-r--r-- | Cargo.toml | 11 | ||||
| -rw-r--r-- | README.md | 45 | ||||
| -rw-r--r-- | rustfmt.toml | 1 | ||||
| -rw-r--r-- | sawtooth.wav | bin | 0 -> 132344 bytes | |||
| -rw-r--r-- | sine.wav | bin | 0 -> 132344 bytes | |||
| -rw-r--r-- | src/README.md | 1 | ||||
| -rw-r--r-- | src/main.rs | 103 | ||||
| -rw-r--r-- | voice.wav | bin | 0 -> 112172 bytes |
10 files changed, 506 insertions, 0 deletions
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--git a/Cargo.toml b/Cargo.toml new file mode 100644 index 0000000..741e92a --- /dev/null +++ b/Cargo.toml @@ -0,0 +1,11 @@ +[package] +name = "seamless-loop" +version = "0.1.0" +edition = "2021" + +# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html + +[dependencies] +anyhow = "1.0.70" +clap = { version = "4.2.5", features = ["derive"] } +wav = "1.0.0" diff --git a/README.md b/README.md new file mode 100644 index 0000000..913ce62 --- /dev/null +++ b/README.md @@ -0,0 +1,45 @@ +# seamless-loop + +Make a WAV file seamlessly loopable. + +Normally when you just loop an audio file, even if the end +sounds almost identical to the beginning, you'll get a click when the file loops. +This program fades a bit of the end of the file into the beginning +so that there's no click. + +For Windows and Linux executables, see the [releases page](https://github.com/pommicket/seamless-loop/releases). + + +## Q and A + +- How do I run this? + +You can run it from the command line, +or on Windows you can drag and drop the WAV file onto the executable. + +- What types of audio does this work with? + +The end of the audio file needs to be very similar to the beginning +for the loop to sound "nice". This program will work +very well with sine waves, white noise, and most synth-generated sounds. +It will probably not work so well with human voice, +due to its natural variation over time. + +- Why are only WAV files supported? + +It might reduce quality to re-encode lossy files... +and it's easier to test just one format. + +If you need to deal with a different format, +you can use ffmpeg or Audacity to convert the file to wav and back. + +- Why not make an Audacity plug-in? + +It would be convenient, but LADSPA and LV2 are really not designed for nonlocal effects like this. + +Perhaps Nyquist can do it, but I'd rather shoot myself in the arm than use Lisp. + +- Why does this program load the whole file into memory when it doesn't need to? + +I didn't want to write my own WAV parser... And anyways WAV files can only be up to 4GB and most people +have more memory than that nowadays. diff --git a/rustfmt.toml b/rustfmt.toml new file mode 100644 index 0000000..218e203 --- /dev/null +++ b/rustfmt.toml @@ -0,0 +1 @@ +hard_tabs = true diff --git a/sawtooth.wav b/sawtooth.wav Binary files differnew file mode 100644 index 0000000..9647d78 --- /dev/null +++ b/sawtooth.wav diff --git a/sine.wav b/sine.wav Binary files differnew file mode 100644 index 0000000..4b4b3c2 --- /dev/null +++ b/sine.wav diff --git a/src/README.md b/src/README.md new file mode 100644 index 0000000..ef294b7 --- /dev/null +++ b/src/README.md @@ -0,0 +1 @@ +# seamless-loop diff --git a/src/main.rs b/src/main.rs new file mode 100644 index 0000000..dbdcbaf --- /dev/null +++ b/src/main.rs @@ -0,0 +1,103 @@ +/* +SEAMLESS LOOP +For more information see README.md. +--- +License: +do what the fuck you want to +*/ + +use clap::Parser; +use std::fs::File; +use std::fmt::{Debug, Display}; +use anyhow::{Result, Context}; + +/// Turn a .wav file into a seamless loop. +#[derive(Parser, Debug)] +struct Args { + /// Input file + file: String, + + /// Output file. Defaults to "x-seamless.wav" for input file "x.wav". + #[arg(short)] + output: Option<String>, + + /// Duration in seconds of the fade. + #[arg(short, default_value_t = 0.03)] + duration: f32, +} + +trait AudioSample: Copy + Debug + Display { + fn interpolate(self, other: Self, t: f32) -> Self; +} + +macro_rules! impl_audio_sample { + ($type:ty, $min:expr, $max:expr) => { + impl AudioSample for $type { + fn interpolate(self, other: Self, t: f32) -> Self { + let a = self as f32; + let b = other as f32; + (a * (1.0 - t) + b * t).clamp($min, $max) as Self + } + } + } +} + +impl_audio_sample!(u8, 0.0, 255.0); +impl_audio_sample!(i16, -32767.0, 32767.0); +// NOTE: twenty-two bit samples are shifted left by 8 by the wav crate, so this is correct for them +impl_audio_sample!(i32, -i32::MAX as f32, i32::MAX as f32); +impl_audio_sample!(f32, -1.0, 1.0); + +fn make_seamless<T: AudioSample>(data: &mut Vec<T>, channels: u16, fade_samples: usize) -> Result<()> { + let channels: usize = channels.into(); + let audio_samples = data.len(); + if fade_samples * 2 >= audio_samples { + return Err(anyhow::anyhow!("Fade duration is too long (must be less than half of audio file's duration).")); + } + if audio_samples % channels != 0 { + return Err(anyhow::anyhow!("Sample count is not multiple of channel count (this shouldn't happen).")); + } + let fade_frames = fade_samples / channels; + let audio_frames = audio_samples / channels; + for i in 0..fade_frames { + let t = i as f32 / (fade_frames as f32); + let j = audio_frames - fade_frames + i; + for c in 0..channels { + data[channels * i + c] = data[channels * j + c].interpolate(data[channels * i + c], t); + } + } + data.truncate((audio_frames - fade_frames) * channels); + Ok(()) +} + +fn main() -> Result<()> { + let args = Args::parse(); + let input = &args.file; + let output = args.output.unwrap_or_else(|| { + let name = input.strip_suffix(".wav").unwrap_or(input); + name.to_string() + "-seamless.wav" + }); + let mut input_file = File::open(input).with_context(|| format!("Couldn't open input file {input}"))?; + let (header, mut data) = wav::read(&mut input_file)?; + drop(input_file); + + let samples = header.sampling_rate as f32 * args.duration; + if !samples.is_finite() || samples < 0.0 || samples > usize::MAX as f32 { + return Err(anyhow::anyhow!("Bad duration")); + } + let samples = samples as usize; + let channels = header.channel_count; + use wav::BitDepth; + match &mut data { + BitDepth::Eight(data) => make_seamless(data, channels, samples)?, + BitDepth::Sixteen(data) => make_seamless(data, channels, samples)?, + BitDepth::TwentyFour(data) => make_seamless(data, channels, samples)?, + BitDepth::ThirtyTwoFloat(data) => make_seamless(data, channels, samples)?, + BitDepth::Empty => return Err(anyhow::anyhow!("No audio data")), + } + + let mut output_file = File::create(&output).with_context(|| format!("Couldn't open output file {output}"))?; + wav::write(header, &data, &mut output_file)?; + + Ok(()) +} diff --git a/voice.wav b/voice.wav Binary files differnew file mode 100644 index 0000000..4967d54 --- /dev/null +++ b/voice.wav |