add TimeSpecDebug(timespec)

src/host/alsa/mod.rs

@@ -1,6 +1,8 @@
 extern crate alsa;
 extern crate libc;
 
+use libc::timespec;
+
 use self::alsa::poll::Descriptors;
 use crate::traits::{DeviceTrait, HostTrait, StreamTrait};
 use crate::{
@@ -12,6 +14,8 @@ use crate::{
 };
 use std::cmp;
 use std::convert::TryInto;
+use std::fmt::Debug;
+use std::path::Display;
 use std::sync::{Arc, Mutex};
 use std::thread::{self, JoinHandle};
 use std::time::Duration;
@@ -873,8 +877,9 @@ fn stream_timestamp(
             let nanos = timespec_diff_nanos(ts, trigger_ts);
             if nanos < 0 {
                 panic!(
-                    "get_htstamp `{}` was earlier than get_trigger_htstamp `{}`",
-                    ts, trigger_ts
+                    "get_htstamp `{:?}` was earlier than get_trigger_htstamp `{:?}`",
+                    TimeSpecDebug(ts),
+                    TimeSpecDebug(trigger_ts)
                 );
             }
             Ok(crate::StreamInstant::from_nanos(nanos))
@@ -889,6 +894,9 @@ fn stream_timestamp(
     }
 }
 
+#[derive(Debug)]
+struct TimeSpecDebug(timespec);
+
 // Adapted from `timestamp2ns` here:
 // https://fossies.org/linux/alsa-lib/test/audio_time.c
 fn timespec_to_nanos(ts: libc::timespec) -> i64 {