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|
use std::path::PathBuf;
use audio::{
AudibleClip, Error, apply_mastering, extract_rms_buckets, mix_range, render_export_buffer,
};
use media::Decoder;
use scene::RetimeConfig;
use time::MediaTime;
const TONE_WAV: &str = concat!(env!("CARGO_MANIFEST_DIR"), "/tests/fixtures/tone.wav");
fn seconds(value: f64) -> MediaTime {
MediaTime::from_seconds_f64(value).expect("finite seconds")
}
fn tone_clip(id: &str, start: f64, duration: f64) -> AudibleClip {
AudibleClip {
element_id: id.to_string(),
path: PathBuf::from(TONE_WAV),
start_time: seconds(start),
duration: seconds(duration),
trim_start: MediaTime::ZERO,
trim_end: MediaTime::ZERO,
volume_db: 0.0,
retime: None,
animations: None,
}
}
fn decode_tone(start: f64, end: f64) -> (Vec<f32>, u32, usize) {
let mut decoder = Decoder::open(TONE_WAV).expect("open tone.wav");
let stream = decoder.info().audio_streams.first().cloned().expect("audio stream");
let decoded = decoder
.decode_audio_range(stream.index, seconds(start), seconds(end))
.expect("decode tone");
(decoded.samples, decoded.sample_rate, decoded.channels as usize)
}
#[test]
fn two_overlapping_tones_sum() {
let clip_a = tone_clip("a", 0.0, 1.0);
let clip_b = tone_clip("b", 0.0, 1.0);
let single = mix_range(&[clip_a.clone()], (seconds(0.0), seconds(1.0)), 44100, 2).unwrap();
let doubled = mix_range(&[clip_a, clip_b], (seconds(0.0), seconds(1.0)), 44100, 2).unwrap();
assert_eq!(single.len(), doubled.len());
for (one, two) in single.iter().zip(doubled.iter()) {
assert!((two - 2.0 * one).abs() < 1e-6, "{two} != 2 * {one}");
}
}
#[test]
fn volume_param_scales_samples() {
let full = tone_clip("full", 0.0, 1.0);
let mut half = tone_clip("half", 0.0, 1.0);
half.volume_db = -6.020599913279624;
let full_mix = mix_range(&[full], (seconds(0.0), seconds(1.0)), 44100, 2).unwrap();
let half_mix = mix_range(&[half], (seconds(0.0), seconds(1.0)), 44100, 2).unwrap();
for (f, h) in full_mix.iter().zip(half_mix.iter()) {
assert!((h - f * 0.5).abs() < 1e-3, "{h} != 0.5 * {f}");
}
}
#[test]
fn retime_2x_consumes_source_twice_as_fast() {
let normal = tone_clip("normal", 0.0, 1.0);
let mut fast = tone_clip("fast", 0.0, 0.5);
fast.retime = Some(RetimeConfig {
rate: 2.0,
maintain_pitch: None,
});
let normal_mix = mix_range(&[normal], (seconds(0.0), seconds(1.0)), 44100, 2).unwrap();
let fast_mix = mix_range(&[fast], (seconds(0.0), seconds(0.5)), 44100, 2).unwrap();
let frames = fast_mix.len() / 2;
for i in 0..frames {
for channel in 0..2 {
let expected = normal_mix[2 * i * 2 + channel];
let actual = fast_mix[i * 2 + channel];
assert!((actual - expected).abs() < 1e-6, "frame {i}: {actual} != {expected}");
}
}
}
#[test]
fn trim_start_offsets_source() {
let mut clip = tone_clip("trimmed", 0.0, 0.5);
clip.trim_start = seconds(0.5);
let mix = mix_range(&[clip], (seconds(0.0), seconds(0.5)), 44100, 2).unwrap();
let (decoded, _rate, channels) = decode_tone(0.5, 1.0);
assert_eq!(channels, 1);
let frames = mix.len() / 2;
for i in 0..frames {
for channel in 0..2 {
let actual = mix[i * 2 + channel];
assert!((actual - decoded[i]).abs() < 1e-6, "frame {i}: {actual} != {}", decoded[i]);
}
}
}
#[test]
fn rms_buckets_of_tone_match_hand_computed() {
let (samples, rate, channels) = decode_tone(0.0, 1.0);
let peak = samples.iter().fold(0.0_f32, |p, s| p.max(s.abs()));
let expected_rms = peak / 2.0_f32.sqrt();
let buckets = extract_rms_buckets(&samples, channels, rate, 10);
assert_eq!(buckets.len(), 10);
for bucket in &buckets {
let relative = (bucket - expected_rms).abs() / expected_rms;
assert!(relative < 0.05, "bucket {bucket} vs expected {expected_rms}");
}
}
#[test]
fn mastering_limits_peaks_on_hot_input() {
let frames = 4096;
let mut samples = vec![1.5_f32; frames * 2];
apply_mastering(&mut samples, 2, 44100);
let peak = samples.iter().fold(0.0_f32, |p, s| p.max(s.abs()));
assert!(peak <= 0.98, "peak was {peak}");
assert!(peak > 0.9, "limiter over-attenuated: peak {peak}");
}
#[test]
fn mastering_leaves_quiet_input_untouched() {
let mut samples: Vec<f32> = (0..1000).map(|i| (i as f32 / 1000.0) * 0.5).collect();
let original = samples.clone();
apply_mastering(&mut samples, 1, 44100);
assert_eq!(samples, original);
}
#[test]
fn maintain_pitch_true_returns_typed_error() {
let mut clip = tone_clip("pitched", 0.0, 0.5);
clip.retime = Some(RetimeConfig {
rate: 2.0,
maintain_pitch: Some(true),
});
let result = mix_range(&[clip], (seconds(0.0), seconds(1.0)), 44100, 2);
match result {
Err(Error::MaintainPitchUnsupported { element_id, rate }) => {
assert_eq!(element_id, "pitched");
assert_eq!(rate, 2.0);
}
other => panic!("expected MaintainPitchUnsupported, got {other:?}"),
}
}
#[test]
fn maintain_pitch_at_unity_rate_is_allowed() {
let mut clip = tone_clip("unity", 0.0, 0.5);
clip.retime = Some(RetimeConfig {
rate: 1.0,
maintain_pitch: Some(true),
});
assert!(mix_range(&[clip], (seconds(0.0), seconds(0.5)), 44100, 2).is_ok());
}
#[test]
fn render_export_buffer_mixes_and_masters() {
let clip = tone_clip("a", 0.0, 1.0);
let buffer = render_export_buffer(&[clip], seconds(1.0), 44100, 2).unwrap();
assert_eq!(buffer.len(), 44100 * 2);
let peak = buffer.iter().fold(0.0_f32, |p, s| p.max(s.abs()));
assert!(peak > 0.05, "peak was {peak}");
assert!(render_export_buffer(&[], seconds(1.0), 44100, 2).unwrap().is_empty());
}
#[test]
fn range_render_only_covers_requested_window() {
let clip = tone_clip("a", 1.0, 1.0);
let buffer = mix_range(&[clip], (seconds(0.0), seconds(2.0)), 44100, 2).unwrap();
let first_half = &buffer[..44100 * 2];
assert!(first_half.iter().all(|s| *s == 0.0));
let second_peak = buffer[44100 * 2..].iter().fold(0.0_f32, |p, s| p.max(s.abs()));
assert!(second_peak > 0.05);
}
#[test]
fn undecodable_clip_contributes_silence() {
let mut clip = tone_clip("missing", 0.0, 1.0);
clip.path = PathBuf::from("/nonexistent/nope.wav");
let buffer = mix_range(&[clip], (seconds(0.0), seconds(0.5)), 44100, 2).unwrap();
assert!(buffer.iter().all(|s| *s == 0.0));
}
|
