Add simple test for parsing mp4 with multiple tracks

tests/mp4box_comparison.rs

@@ -1,9 +1,8 @@
 #![allow(clippy::unwrap_used)]
 
-use std::path::Path;
+mod paths;
 
-const TEST_BASE_PATH: &str = concat!(env!("CARGO_MANIFEST_DIR"), "/tests");
-const SAMPLE_BASE_PATH: &str = concat!(env!("CARGO_MANIFEST_DIR"), "/tests/samples");
+use std::path::Path;
 
 fn assert_snapshot(snapshot_path: &Path, contents: &[u8]) {
     // if file doesn't exist, create it
@@ -53,7 +52,7 @@ fn compare_video_snapshot_with_mp4box_output(video_path: &Path) {
     assert!(
         std::process::Command::new("node")
             .arg(
-                Path::new(TEST_BASE_PATH)
+                Path::new(paths::TEST_BASE_PATH)
                     .join("mp4box_parse.mjs")
                     .to_str()
                     .unwrap()
@@ -97,7 +96,7 @@ fn compare_video_snapshot_with_mp4box_output(video_path: &Path) {
 #[test]
 fn compare_video_snapshot_with_mp4box_output_bigbuckbunny() {
     // List all mp4 files in the bigbuckbunny directory.
-    let base_path = Path::new(SAMPLE_BASE_PATH);
+    let base_path = Path::new(paths::SAMPLE_BASE_PATH);
     let bigbuckbunny_path = base_path.join("bigbuckbunny");
 
     for entry in std::fs::read_dir(bigbuckbunny_path).unwrap() {

tests/multitrack.rs

@@ -0,0 +1,49 @@
+mod paths;
+
+#[test]
+fn multitrack_video_with_subtitles_and_sound() {
+    let mp4_with_subtitles_and_sound = std::path::Path::new(paths::SAMPLE_BASE_PATH)
+        .join("rerun404_avc_with_subtitles_and_sound.mp4");
+
+    let bytes = std::fs::read(mp4_with_subtitles_and_sound).unwrap();
+    let video = re_mp4::read(&bytes).unwrap();
+
+    assert_eq!(video.tracks().len(), 3);
+    assert_eq!(video.moov.mvhd.next_track_id, 4);
+
+    // Video track.
+    {
+        let track = video.tracks().get(&1).unwrap();
+        assert_eq!(track.kind, Some(re_mp4::TrackKind::Video));
+        assert_eq!(track.codec_string(&video), Some("avc1.640028".to_owned()));
+        assert_eq!(track.track_id, 1);
+        assert_eq!(track.width, 600);
+        assert_eq!(track.height, 600);
+        assert!(!track.samples.is_empty());
+        assert!(!track.data.is_empty());
+    }
+
+    // Audio track.
+    {
+        let track = video.tracks().get(&2).unwrap();
+        assert_eq!(track.kind, Some(re_mp4::TrackKind::Audio));
+        assert_eq!(track.codec_string(&video), None);
+        assert_eq!(track.track_id, 2);
+        assert_eq!(track.width, 0);
+        assert_eq!(track.height, 0);
+        assert!(!track.samples.is_empty());
+        assert!(!track.data.is_empty());
+    }
+
+    // Subtitle track.
+    {
+        let track = video.tracks().get(&3).unwrap();
+        assert_eq!(track.kind, Some(re_mp4::TrackKind::Subtitle));
+        assert_eq!(track.codec_string(&video), None);
+        assert_eq!(track.track_id, 3);
+        assert_eq!(track.width, 0);
+        assert_eq!(track.height, 0);
+        assert!(!track.samples.is_empty());
+        assert!(!track.data.is_empty());
+    }
+}

tests/paths.rs

@@ -0,0 +1,4 @@
+#[allow(dead_code)]
+
+pub const TEST_BASE_PATH: &str = concat!(env!("CARGO_MANIFEST_DIR"), "/tests");
+pub const SAMPLE_BASE_PATH: &str = concat!(env!("CARGO_MANIFEST_DIR"), "/tests/samples");