add criterion for benchmarking performance.

Cargo.toml

@@ -22,3 +22,10 @@ thiserror = "^1.0"
 byteorder = "1"
 bytes = "0.5"
 num-rational = "0.3"
+
+[dev-dependencies]
+criterion = "0.3"
+
+[[bench]]
+name = "bench_main"
+harness = false

README.md

@@ -81,6 +81,14 @@ With print statement output.
 cargo test -- --nocapture
 ```
 
+#### Run Benchmark Tests
+```
+cargo bench
+```
+
+View HTML report at `target/criterion/report/index.html`
+
+
 ## Resources
 Thanks to the following resources used when learning Rust:
 * https://github.com/mozilla/mp4parse-rust

benches/bench_main.rs

@@ -0,0 +1,22 @@
+use criterion::BenchmarkId;
+use criterion::{criterion_group, criterion_main, Criterion};
+use mp4;
+use std::fs::File;
+
+fn read_mp4(filename: &str) -> u64 {
+    let f = File::open(filename).unwrap();
+    let m = mp4::read_mp4(f).unwrap();
+    let size = m.size();
+    size
+}
+
+fn criterion_benchmark(c: &mut Criterion) {
+    let filename = "tests/samples/minimal.mp4";
+
+    c.bench_with_input(BenchmarkId::new("input_example", filename), &filename, |b, &s| {
+        b.iter(|| read_mp4(s));
+    });
+}
+
+criterion_group!(benches, criterion_benchmark);
+criterion_main!(benches);

examples/simple.rs

@@ -6,7 +6,7 @@ fn main() {
     let args: Vec<String> = env::args().collect();
 
     if args.len() < 2 {
-        println!("Usage: mp4dump <filename>");
+        println!("Usage: simple <filename>");
         std::process::exit(1);
     }