Merge pull request #922 from JasonLG1979/cleanup_list_compatible_devices

Clean up `list_compatible_devices`

Author: roderickvd

playback/src/audio_backend/alsa.rs

@@ -62,8 +62,8 @@ enum AlsaError {
     #[error("<AlsaSink> PCM, {0}")]
     Pcm(alsa::Error),
 
-    #[error("<AlsaSink> Could Not Parse Ouput Name(s) and/or Description(s)")]
-    Parsing,
+    #[error("<AlsaSink> Could Not Parse Output Name(s) and/or Description(s), {0}")]
+    Parsing(alsa::Error),
 
     #[error("<AlsaSink>")]
     NotConnected,
@@ -107,49 +107,58 @@ pub struct AlsaSink {
 }
 
 fn list_compatible_devices() -> SinkResult<()> {
+    let i = HintIter::new_str(None, "pcm").map_err(AlsaError::Parsing)?;
+
     println!("\n\n\tCompatible alsa device(s):\n");
     println!("\t------------------------------------------------------\n");
 
-    let i = HintIter::new_str(None, "pcm").map_err(|_| AlsaError::Parsing)?;
-
     for a in i {
         if let Some(Direction::Playback) = a.direction {
-            let name = a.name.ok_or(AlsaError::Parsing)?;
-            let desc = a.desc.ok_or(AlsaError::Parsing)?;
-
-            if let Ok(pcm) = PCM::new(&name, Direction::Playback, false) {
-                if let Ok(hwp) = HwParams::any(&pcm) {
-                    // Only show devices that support
-                    // 2 ch 44.1 Interleaved.
-                    if hwp.set_access(Access::RWInterleaved).is_ok()
-                        && hwp.set_rate(SAMPLE_RATE, ValueOr::Nearest).is_ok()
-                        && hwp.set_channels(NUM_CHANNELS as u32).is_ok()
-                    {
-                        println!("\tDevice:\n\n\t\t{}\n", name);
-                        println!("\tDescription:\n\n\t\t{}\n", desc.replace("\n", "\n\t\t"));
-
-                        let mut supported_formats = vec![];
-
-                        for f in &[
-                            AudioFormat::S16,
-                            AudioFormat::S24,
-                            AudioFormat::S24_3,
-                            AudioFormat::S32,
-                            AudioFormat::F32,
-                            AudioFormat::F64,
-                        ] {
-                            if hwp.test_format(Format::from(*f)).is_ok() {
-                                supported_formats.push(format!("{:?}", f));
+            if let Some(name) = a.name {
+                if let Ok(pcm) = PCM::new(&name, Direction::Playback, false) {
+                    if let Ok(hwp) = HwParams::any(&pcm) {
+                        // Only show devices that support
+                        // 2 ch 44.1 Interleaved.
+
+                        if hwp.set_access(Access::RWInterleaved).is_ok()
+                            && hwp.set_rate(SAMPLE_RATE, ValueOr::Nearest).is_ok()
+                            && hwp.set_channels(NUM_CHANNELS as u32).is_ok()
+                        {
+                            let mut supported_formats = vec![];
+
+                            for f in &[
+                                AudioFormat::S16,
+                                AudioFormat::S24,
+                                AudioFormat::S24_3,
+                                AudioFormat::S32,
+                                AudioFormat::F32,
+                                AudioFormat::F64,
+                            ] {
+                                if hwp.test_format(Format::from(*f)).is_ok() {
+                                    supported_formats.push(format!("{:?}", f));
+                                }
                             }
-                        }
 
-                        println!(
-                            "\tSupported Format(s):\n\n\t\t{}\n",
-                            supported_formats.join(" ")
-                        );
-                        println!("\t------------------------------------------------------\n");
-                    }
-                };
+                            if !supported_formats.is_empty() {
+                                println!("\tDevice:\n\n\t\t{}\n", name);
+
+                                println!(
+                                    "\tDescription:\n\n\t\t{}\n",
+                                    a.desc.unwrap_or_default().replace("\n", "\n\t\t")
+                                );
+
+                                println!(
+                                    "\tSupported Format(s):\n\n\t\t{}\n",
+                                    supported_formats.join(" ")
+                                );
+
+                                println!(
+                                    "\t------------------------------------------------------\n"
+                                );
+                            }
+                        }
+                    };
+                }
             }
         }
     }