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use media::{Decoder, Error, MediaTime, thumbnail, waveform_summary};
const SAMPLE_MP4: &str = concat!(env!("CARGO_MANIFEST_DIR"), "/tests/fixtures/sample.mp4");
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")
}
#[test]
fn reports_media_info() {
let decoder = Decoder::open(SAMPLE_MP4).expect("open sample.mp4");
let info = decoder.info();
let duration_seconds = info.duration.to_seconds_f64();
assert!(
(duration_seconds - 2.0).abs() < 0.05,
"duration was {duration_seconds}"
);
let video = info.video_streams.first().expect("video stream");
assert_eq!(video.width, 320);
assert_eq!(video.height, 180);
assert!(
(video.frame_rate - 30.0).abs() < 0.01,
"frame rate was {}",
video.frame_rate
);
assert_eq!(video.frame_count, Some(60));
let audio = info.audio_streams.first().expect("audio stream");
assert_eq!(audio.sample_rate, 44100);
assert!(audio.channels >= 1);
}
#[test]
fn decodes_video_frame_at_zero_and_one_second() {
let mut decoder = Decoder::open(SAMPLE_MP4).expect("open sample.mp4");
let first = decoder
.decode_video_frame(0, seconds(0.0))
.expect("frame at t=0");
assert_eq!(first.width, 320);
assert_eq!(first.height, 180);
assert_eq!(first.data.len(), 320 * 180 * 4);
let first_pixel = &first.data[0..4];
assert!(
first.data.chunks_exact(4).any(|pixel| pixel != first_pixel),
"frame at t=0 is uniform"
);
let later = decoder
.decode_video_frame(0, seconds(1.0))
.expect("frame at t=1");
assert_eq!(later.width, 320);
assert_eq!(later.height, 180);
assert!(
later.data.chunks_exact(4).any(|pixel| pixel != first_pixel),
"frame at t=1 is uniform"
);
assert_ne!(first.data, later.data, "frames at t=0 and t=1 are identical");
}
#[test]
fn decodes_sequential_frames_forward() {
let mut decoder = Decoder::open(SAMPLE_MP4).expect("open sample.mp4");
let mut previous = decoder.decode_video_frame(0, seconds(0.25)).expect("t=0.25");
for step in 1..8 {
let time = 0.25 + f64::from(step) * 0.2;
let frame = decoder.decode_video_frame(0, seconds(time)).expect("frame");
assert_eq!((frame.width, frame.height), (320, 180));
previous = frame;
}
let _ = previous;
}
#[test]
fn time_past_eof_returns_last_frame() {
let mut decoder = Decoder::open(SAMPLE_MP4).expect("open sample.mp4");
let frame = decoder
.decode_video_frame(0, seconds(10.0))
.expect("frame past EOF");
assert_eq!(frame.width, 320);
assert_eq!(frame.height, 180);
assert_eq!(frame.data.len(), 320 * 180 * 4);
}
#[test]
fn rejects_wrong_stream_type() {
let mut decoder = Decoder::open(SAMPLE_MP4).expect("open sample.mp4");
let info = decoder.info();
let audio_index = info.audio_streams.first().expect("audio stream").index;
let result = decoder.decode_video_frame(audio_index, seconds(0.0));
assert!(matches!(result, Err(Error::NotAVideoStream(_))));
let video_index = info.video_streams.first().expect("video stream").index;
let result = decoder.decode_audio_range(video_index, seconds(0.0), seconds(1.0));
assert!(matches!(result, Err(Error::NotAnAudioStream(_))));
let result = decoder.decode_video_frame(99, seconds(0.0));
assert!(matches!(result, Err(Error::StreamNotFound(99))));
}
#[test]
fn decodes_tone_waveform() {
let mut decoder = Decoder::open(TONE_WAV).expect("open tone.wav");
let info = decoder.info();
let audio = info.audio_streams.first().expect("audio stream");
assert_eq!(audio.sample_rate, 44100);
let decoded = decoder
.decode_audio_range(audio.index, seconds(0.0), seconds(1.0))
.expect("decode range");
assert_eq!(decoded.sample_rate, 44100);
let channels = decoded.channels as usize;
let frame_count = decoded.samples.len() / channels;
assert!(
(frame_count as i64 - 44100).abs() <= 2,
"frame count was {frame_count}"
);
let mean_square: f32 =
decoded.samples.iter().map(|sample| sample * sample).sum::<f32>()
/ decoded.samples.len() as f32;
assert!(mean_square.sqrt() > 0.05, "rms was {}", mean_square.sqrt());
assert!(
decoded.samples.iter().all(|sample| sample.abs() <= 1.0),
"samples exceed [-1, 1]"
);
let mut crossings = 0usize;
let mut previous_sign = decoded.samples[0].is_sign_negative();
for &sample in &decoded.samples[1..] {
let sign = sample.is_sign_negative();
if sign != previous_sign {
crossings += 1;
previous_sign = sign;
}
}
assert!(
(crossings as i64 - 440).abs() <= 22,
"zero crossings were {crossings}"
);
}
#[test]
fn decodes_aac_audio_range() {
let mut decoder = Decoder::open(SAMPLE_MP4).expect("open sample.mp4");
let info = decoder.info();
let audio = info.audio_streams.first().expect("audio stream");
let decoded = decoder
.decode_audio_range(audio.index, seconds(0.5), seconds(1.5))
.expect("decode aac range");
assert_eq!(decoded.sample_rate, 44100);
let channels = decoded.channels as usize;
let frame_count = decoded.samples.len() / channels;
assert!(
(frame_count as i64 - 44100).abs() <= 100,
"frame count was {frame_count}"
);
let mean_square: f32 =
decoded.samples.iter().map(|sample| sample * sample).sum::<f32>()
/ decoded.samples.len() as f32;
assert!(mean_square.sqrt() > 0.01, "rms was {}", mean_square.sqrt());
}
#[test]
fn rejects_invalid_audio_range() {
let mut decoder = Decoder::open(TONE_WAV).expect("open tone.wav");
let result = decoder.decode_audio_range(0, seconds(1.0), seconds(0.5));
assert!(matches!(result, Err(Error::InvalidTimeRange)));
}
#[test]
fn scales_thumbnail_to_max_dimension() {
let thumb = thumbnail(SAMPLE_MP4, 64).expect("thumbnail");
assert_eq!(thumb.width, 64);
assert_eq!(thumb.height, 36);
assert_eq!(thumb.data.len(), 64 * 36 * 4);
let first_pixel = &thumb.data[0..4];
assert!(
thumb.data.chunks_exact(4).any(|pixel| pixel != first_pixel),
"thumbnail is uniform"
);
}
#[test]
fn summarizes_waveform_buckets() {
let buckets = waveform_summary(TONE_WAV, 10).expect("waveform summary");
assert_eq!(buckets.len(), 10);
for (low, high) in &buckets {
assert!(low <= high, "bucket min {low} exceeds max {high}");
assert!(*low >= -1.0 && *high <= 1.0, "bucket ({low}, {high}) out of range");
}
assert!(
buckets.iter().any(|(low, high)| *high > 0.1 && *low < -0.1),
"no bucket carries the 220Hz tone"
);
let single = waveform_summary(TONE_WAV, 1).expect("single bucket");
assert_eq!(single.len(), 1);
assert!(single[0].1 > 0.1);
assert!(matches!(waveform_summary(TONE_WAV, 0), Err(Error::InvalidBucketCount)));
}
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