Get default device with cpal

README.md

@@ -545,7 +545,7 @@ devices:
     * `Stdin` (capture only)
     * `Stdout` (playback only)
   * `channels`: number of channels
-  * `device`: device name (for Alsa, Pulse, Wasapi, CoreAudio)
+  * `device`: device name (for Alsa, Pulse, Wasapi, CoreAudio). For CoreAudio and Wasapi, "default" will give the default device.
   * `filename` path the the file (for File)
   * `format`: sample format.
 

devices.md

@@ -41,7 +41,7 @@ Available formats:
 - S16_LE
 - S32_LE
 ```
-The interesting fields are FORMAT, RATE and CHANNELS. In this example the sample formats this device can use are S16_LE and S32_LE (corresponding to S16LE and S32LE in CamillaDSP, see the table in the main README for all formats). The sample rate can be either 44,1, or 48 kHz. And it supports only stereo playback.
+The interesting fields are FORMAT, RATE and CHANNELS. In this example the sample formats this device can use are S16_LE and S32_LE (corresponding to S16LE and S32LE in CamillaDSP, see the table in the main README for all formats). The sample rate can be either 44.1, or 48 kHz. And it supports only stereo playback.
 
 
 Capture parameters are determined in the same way with `arecord`:

src/config.rs

@@ -804,10 +804,11 @@ fn replace_tokens_in_config(config: &mut Configuration) {
     let num_channels = config.devices.capture.channels();
     //let mut new_config = config.clone();
     for (_name, filter) in config.filters.iter_mut() {
-        if let Filter::Conv { parameters } = filter {
-            if let ConvParameters::File { filename, .. } = parameters {
-                *filename = replace_tokens(filename, samplerate, num_channels);
-            }
+        if let Filter::Conv {
+            parameters: ConvParameters::File { filename, .. },
+        } = filter
+        {
+            *filename = replace_tokens(filename, samplerate, num_channels);
         }
     }
     for mut step in config.pipeline.iter_mut() {
@@ -829,10 +830,11 @@ fn replace_relative_paths_in_config(config: &mut Configuration, configname: &str
     if let Ok(config_file) = PathBuf::from(configname.to_owned()).canonicalize() {
         if let Some(config_dir) = config_file.parent() {
             for (_name, filter) in config.filters.iter_mut() {
-                if let Filter::Conv { parameters } = filter {
-                    if let ConvParameters::File { filename, .. } = parameters {
-                        check_and_replace_relative_path(filename, config_dir);
-                    }
+                if let Filter::Conv {
+                    parameters: ConvParameters::File { filename, .. },
+                } = filter
+                {
+                    check_and_replace_relative_path(filename, config_dir);
                 }
             }
         } else {

src/cpaldevice.rs

@@ -75,15 +75,25 @@ fn open_cpal_playback(
         CpalHost::Wasapi => HostId::Wasapi,
     };
     let host = cpal::host_from_id(host_id)?;
-    let mut devices = host.devices()?;
-    let device = match devices.find(|dev| match dev.name() {
-        Ok(n) => n == devname,
-        _ => false,
-    }) {
-        Some(dev) => dev,
-        None => {
-            let msg = format!("Could not find device '{}'", devname);
-            return Err(ConfigError::new(&msg).into());
+    let device = if devname == "default" {
+        match host.default_output_device() {
+            Some(dev) => dev,
+            None => {
+                let msg = "Could not get default playback device".to_string();
+                return Err(ConfigError::new(&msg).into());
+            }
+        }
+    } else {
+        let mut devices = host.devices()?;
+        match devices.find(|dev| match dev.name() {
+            Ok(n) => n == devname,
+            _ => false,
+        }) {
+            Some(dev) => dev,
+            None => {
+                let msg = format!("Could not find playback device '{}'", devname);
+                return Err(ConfigError::new(&msg).into());
+            }
         }
     };
     let cpal_format = match sample_format {
@@ -114,17 +124,28 @@ fn open_cpal_capture(
         CpalHost::Wasapi => HostId::Wasapi,
     };
     let host = cpal::host_from_id(host_id)?;
-    let mut devices = host.devices()?;
-    let device = match devices.find(|dev| match dev.name() {
-        Ok(n) => n == devname,
-        _ => false,
-    }) {
-        Some(dev) => dev,
-        None => {
-            let msg = format!("Could not find device '{}'", devname);
-            return Err(ConfigError::new(&msg).into());
+    let device = if devname == "default" {
+        match host.default_input_device() {
+            Some(dev) => dev,
+            None => {
+                let msg = "Could not get default capture device".to_string();
+                return Err(ConfigError::new(&msg).into());
+            }
+        }
+    } else {
+        let mut devices = host.devices()?;
+        match devices.find(|dev| match dev.name() {
+            Ok(n) => n == devname,
+            _ => false,
+        }) {
+            Some(dev) => dev,
+            None => {
+                let msg = format!("Could not find capture device '{}'", devname);
+                return Err(ConfigError::new(&msg).into());
+            }
         }
     };
+
     let cpal_format = match sample_format {
         SampleFormat::S16LE => cpal::SampleFormat::I16,
         SampleFormat::FLOAT32LE => cpal::SampleFormat::F32,