no panic on unusable mic

listen-lib/src/lib.rs

@@ -25,7 +25,11 @@ pub fn devices() -> Vec<String> {
 fn _devices() -> Result<Vec<cpal::Device>, String> {
    match cpal::default_host().devices() {
       Ok(devices) => Ok(devices.filter(|device| {
-         device.supported_input_configs().unwrap().count() > 0
+         let input_configs = device.supported_input_configs();
+         if !input_configs.is_ok() {
+            return false;
+         }
+         input_configs.unwrap().count() > 0
       }).collect()),
       Err(msg) => Err(format!("failed to get devices: {}", msg)),
    }

rust-whisper-baked/src/main.rs

@@ -68,10 +68,14 @@ fn channel(flags: rust_whisper_lib::Flags) {
    let flags = rust_whisper_lib::Flags::parse();
    match flags.stream_device {
       Some(device_name) => {
-         if device_name == "" {
+         eprintln!("with device ({}) '{}'", device_name.len(), &device_name);
+         if device_name.len() == 0 {
+            let mut i = 0;
             for device in listen_lib::devices() {
-               eprintln!("{}", device);
+               eprintln!("[{}] {}", i, device);
+               i += 1;
             }
+            eprintln!("found {} devices", i);
          } else {
             listen_lib::main_with(|data| {
                send.send(data).unwrap();
@@ -79,6 +83,7 @@ fn channel(flags: rust_whisper_lib::Flags) {
          }
       },
       None => {
+         eprintln!("without any device");
          listen_lib::main(|data| {
             send.send(data).unwrap();
          });