spotifyaudiosrc: Support configurable bitrate

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-rs/-/merge_requests/1073>

audio/spotify/src/spotifyaudiosrc/imp.rs

@@ -31,6 +31,8 @@ use librespot::playback::{
     player::{Player, PlayerEvent},
 };
 
+use super::Bitrate;
+
 static CAT: Lazy<gst::DebugCategory> = Lazy::new(|| {
     gst::DebugCategory::new(
         "spotifyaudiosrc",
@@ -71,6 +73,7 @@ struct Settings {
     cache_files: String,
     cache_max_size: u64,
     track: String,
+    bitrate: Bitrate,
 }
 
 #[derive(Default)]
@@ -132,6 +135,11 @@ impl ObjectImpl for SpotifyAudioSrc {
                     .default_value(Some(""))
                     .mutable_ready()
                     .build(),
+                 glib::ParamSpecEnum::builder::<Bitrate>("bitrate")
+                     .nick("Spotify bitrate")
+                     .blurb("Spotify audio bitrate in kbit/s")
+                     .mutable_ready()
+                     .build()
             ]
         });
 
@@ -164,6 +172,10 @@ impl ObjectImpl for SpotifyAudioSrc {
                 let mut settings = self.settings.lock().unwrap();
                 settings.track = value.get().expect("type checked upstream");
             }
+            "bitrate" => {
+                let mut settings = self.settings.lock().unwrap();
+                settings.bitrate = value.get().expect("type checked upstream");
+            }
             _ => unimplemented!(),
         }
     }
@@ -194,6 +206,10 @@ impl ObjectImpl for SpotifyAudioSrc {
                 let settings = self.settings.lock().unwrap();
                 settings.track.to_value()
             }
+            "bitrate" => {
+                let settings = self.settings.lock().unwrap();
+                settings.bitrate.to_value()
+            }
             _ => unimplemented!(),
         }
     }
@@ -434,7 +450,7 @@ impl SpotifyAudioSrc {
             }
         }
 
-        let (credentials, cache, track) = {
+        let (credentials, cache, track, bitrate) = {
             let settings = self.settings.lock().unwrap();
 
             let credentials_cache = if settings.cache_credentials.is_empty() {
@@ -482,7 +498,10 @@ impl SpotifyAudioSrc {
                 bail!("track is not set")
             }
 
-            (credentials, cache, settings.track.clone())
+            let bitrate = settings.bitrate.into();
+            gst::debug!(CAT, imp: self, "Requesting bitrate {:?}", bitrate);
+
+            (credentials, cache, settings.track.clone(), bitrate)
         };
 
         let (session, _credentials) =
@@ -490,6 +509,7 @@ impl SpotifyAudioSrc {
 
         let player_config = PlayerConfig {
             passthrough: true,
+            bitrate,
             ..Default::default()
         };
 

audio/spotify/src/spotifyaudiosrc/mod.rs

@@ -11,11 +11,42 @@ use gst::prelude::*;
 
 mod imp;
 
+#[derive(Debug, Eq, PartialEq, Ord, PartialOrd, Hash, Clone, Copy, glib::Enum)]
+#[repr(u32)]
+#[enum_type(name = "GstRsSpotifyBitrate")]
+enum Bitrate {
+    #[enum_value(name = "96 kbit/s", nick = "96")]
+    B96,
+    #[enum_value(name = "160 kbit/s", nick = "160")]
+    B160,
+    #[enum_value(name = "320 kbit/s", nick = "320")]
+    B320,
+}
+
+impl Default for Bitrate {
+    fn default() -> Self {
+        Self::B160
+    }
+}
+
+impl From<Bitrate> for librespot::playback::config::Bitrate {
+    fn from(value: Bitrate) -> Self {
+        match value {
+            Bitrate::B96 => Self::Bitrate96,
+            Bitrate::B160 => Self::Bitrate160,
+            Bitrate::B320 => Self::Bitrate320,
+        }
+    }
+}
+
 glib::wrapper! {
     pub struct SpotifyAudioSrc(ObjectSubclass<imp::SpotifyAudioSrc>) @extends gst_base::PushSrc, gst_base::BaseSrc, gst::Element, gst::Object, @implements gst::URIHandler;
 }
 
 pub fn register(plugin: &gst::Plugin) -> Result<(), glib::BoolError> {
+    #[cfg(feature = "doc")]
+    Bitrate::static_type().mark_as_plugin_api(gst::PluginAPIFlags::empty());
+
     gst::Element::register(
         Some(plugin),
         "spotifyaudiosrc",

docs/plugins/gst_plugins_cache.json

@@ -6311,6 +6311,18 @@
                     }
                 },
                 "properties": {
+                    "bitrate": {
+                        "blurb": "Spotify audio bitrate in kbit/s",
+                        "conditionally-available": false,
+                        "construct": false,
+                        "construct-only": false,
+                        "controllable": false,
+                        "default": "160 (1)",
+                        "mutable": "ready",
+                        "readable": true,
+                        "type": "GstRsSpotifyBitrate",
+                        "writable": true
+                    },
                     "cache-credentials": {
                         "blurb": "Directory where to cache Spotify credentials",
                         "conditionally-available": false,
@@ -6391,7 +6403,28 @@
         },
         "filename": "gstspotify",
         "license": "MPL",
-        "other-types": {},
+        "other-types": {
+            "GstRsSpotifyBitrate": {
+                "kind": "enum",
+                "values": [
+                    {
+                        "desc": "96 kbit/s",
+                        "name": "96",
+                        "value": "0"
+                    },
+                    {
+                        "desc": "160 kbit/s",
+                        "name": "160",
+                        "value": "1"
+                    },
+                    {
+                        "desc": "320 kbit/s",
+                        "name": "320",
+                        "value": "2"
+                    }
+                ]
+            }
+        },
         "package": "gst-plugin-spotify",
         "source": "gst-plugin-spotify",
         "tracers": {},