feat: add Opus 32k/48k/64k studio quality tiers

Adds three new codec IDs (Opus32k=6, Opus48k=7, Opus64k=8) and
corresponding STUDIO_32K, STUDIO_48K, STUDIO_64K quality profiles.
All use 20ms frames with minimal FEC (10%) for maximum quality on
good networks.

Updated across: wire protocol (codec_id.rs), encoder/decoder
(opus_enc/dec.rs), adaptive codec switch (call.rs), CLI
(--profile studio-64k), desktop engine + UI slider (8 quality
levels from Studio 64k green to Codec2 1.2k red).

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

crates/wzp-client/src/call.rs

@@ -532,6 +532,9 @@ impl CallDecoder {
                 frames_per_block: 5,
             },
             CodecId::Opus6k => QualityProfile::DEGRADED,
+            CodecId::Opus32k => QualityProfile::STUDIO_32K,
+            CodecId::Opus48k => QualityProfile::STUDIO_48K,
+            CodecId::Opus64k => QualityProfile::STUDIO_64K,
             CodecId::Codec2_3200 => QualityProfile {
                 codec: CodecId::Codec2_3200,
                 fec_ratio: 0.5,

crates/wzp-client/src/cli.rs

@@ -133,9 +133,12 @@ fn resolve_profile(name: &str) -> wzp_proto::QualityProfile {
             frame_duration_ms: 20,
             frames_per_block: 5,
         },
+        "studio-32k" | "opus32k" | "32k" => QualityProfile::STUDIO_32K,
+        "studio-48k" | "opus48k" | "48k" | "studio" => QualityProfile::STUDIO_48K,
+        "studio-64k" | "opus64k" | "64k" | "studio-high" => QualityProfile::STUDIO_64K,
         other => {
             eprintln!("unknown profile: {other}");
-            eprintln!("valid: good, degraded, catastrophic, codec2-3200, codec2-1200");
+            eprintln!("valid: good, degraded, catastrophic, codec2-3200, codec2-1200, studio-32k, studio-48k, studio-64k");
             std::process::exit(1);
         }
     }

crates/wzp-codec/src/opus_dec.rs

@@ -79,7 +79,7 @@ impl AudioDecoder for OpusDecoder {
 
     fn set_profile(&mut self, profile: QualityProfile) -> Result<(), CodecError> {
         match profile.codec {
-            CodecId::Opus24k | CodecId::Opus16k | CodecId::Opus6k => {
+            c if c.is_opus() => {
                 self.codec_id = profile.codec;
                 self.frame_duration_ms = profile.frame_duration_ms;
                 Ok(())

crates/wzp-codec/src/opus_enc.rs

@@ -100,7 +100,7 @@ impl AudioEncoder for OpusEncoder {
 
     fn set_profile(&mut self, profile: QualityProfile) -> Result<(), CodecError> {
         match profile.codec {
-            CodecId::Opus24k | CodecId::Opus16k | CodecId::Opus6k => {
+            c if c.is_opus() => {
                 self.codec_id = profile.codec;
                 self.frame_duration_ms = profile.frame_duration_ms;
                 self.apply_bitrate(profile.codec)?;

crates/wzp-proto/src/codec_id.rs

@@ -18,6 +18,12 @@ pub enum CodecId {
     Codec2_1200 = 4,
     /// Comfort noise descriptor (silence suppression)
     ComfortNoise = 5,
+    /// Opus at 32kbps (studio low)
+    Opus32k = 6,
+    /// Opus at 48kbps (studio)
+    Opus48k = 7,
+    /// Opus at 64kbps (studio high)
+    Opus64k = 8,
 }
 
 impl CodecId {
@@ -27,6 +33,9 @@ impl CodecId {
             Self::Opus24k => 24_000,
             Self::Opus16k => 16_000,
             Self::Opus6k => 6_000,
+            Self::Opus32k => 32_000,
+            Self::Opus48k => 48_000,
+            Self::Opus64k => 64_000,
             Self::Codec2_3200 => 3_200,
             Self::Codec2_1200 => 1_200,
             Self::ComfortNoise => 0,
@@ -36,8 +45,7 @@ impl CodecId {
     /// Preferred frame duration in milliseconds.
     pub const fn frame_duration_ms(self) -> u8 {
         match self {
-            Self::Opus24k => 20,
-            Self::Opus16k => 20,
+            Self::Opus24k | Self::Opus16k | Self::Opus32k | Self::Opus48k | Self::Opus64k => 20,
             Self::Opus6k => 40,
             Self::Codec2_3200 => 20,
             Self::Codec2_1200 => 40,
@@ -48,7 +56,8 @@ impl CodecId {
     /// Sample rate expected by this codec.
     pub const fn sample_rate_hz(self) -> u32 {
         match self {
-            Self::Opus24k | Self::Opus16k | Self::Opus6k => 48_000,
+            Self::Opus24k | Self::Opus16k | Self::Opus6k
+            | Self::Opus32k | Self::Opus48k | Self::Opus64k => 48_000,
             Self::Codec2_3200 | Self::Codec2_1200 => 8_000,
             Self::ComfortNoise => 48_000,
         }
@@ -63,6 +72,9 @@ impl CodecId {
             3 => Some(Self::Codec2_3200),
             4 => Some(Self::Codec2_1200),
             5 => Some(Self::ComfortNoise),
+            6 => Some(Self::Opus32k),
+            7 => Some(Self::Opus48k),
+            8 => Some(Self::Opus64k),
             _ => None,
         }
     }
@@ -71,6 +83,12 @@ impl CodecId {
     pub const fn to_wire(self) -> u8 {
         self as u8
     }
+
+    /// Returns true if this is an Opus variant.
+    pub const fn is_opus(self) -> bool {
+        matches!(self, Self::Opus6k | Self::Opus16k | Self::Opus24k
+            | Self::Opus32k | Self::Opus48k | Self::Opus64k)
+    }
 }
 
 /// Describes the complete quality configuration for a call session.
@@ -111,6 +129,30 @@ impl QualityProfile {
         frames_per_block: 8,
     };
 
+    /// Studio low: Opus 32kbps, minimal FEC.
+    pub const STUDIO_32K: Self = Self {
+        codec: CodecId::Opus32k,
+        fec_ratio: 0.1,
+        frame_duration_ms: 20,
+        frames_per_block: 5,
+    };
+
+    /// Studio: Opus 48kbps, minimal FEC.
+    pub const STUDIO_48K: Self = Self {
+        codec: CodecId::Opus48k,
+        fec_ratio: 0.1,
+        frame_duration_ms: 20,
+        frames_per_block: 5,
+    };
+
+    /// Studio high: Opus 64kbps, minimal FEC.
+    pub const STUDIO_64K: Self = Self {
+        codec: CodecId::Opus64k,
+        fec_ratio: 0.1,
+        frame_duration_ms: 20,
+        frames_per_block: 5,
+    };
+
     /// Estimated total bandwidth in kbps including FEC overhead.
     pub fn total_bitrate_kbps(&self) -> f32 {
         let base = self.codec.bitrate_bps() as f32 / 1000.0;

desktop/index.html

@@ -96,13 +96,16 @@
                 <span class="setting-label">QUALITY</span>
                 <span id="s-quality-label" class="quality-label">Auto</span>
               </div>
-              <input id="s-quality" type="range" min="0" max="4" step="1" value="0" class="quality-slider" />
+              <input id="s-quality" type="range" min="0" max="7" step="1" value="3" class="quality-slider" />
               <div class="quality-ticks">
+                <span>64k</span>
+                <span>48k</span>
+                <span>32k</span>
                 <span>Auto</span>
-                <span>Opus 24k</span>
-                <span>Opus 6k</span>
-                <span>C2 3.2k</span>
-                <span>C2 1.2k</span>
+                <span>24k</span>
+                <span>6k</span>
+                <span>C2</span>
+                <span>1.2k</span>
               </div>
             </div>
             <label class="checkbox">

desktop/src-tauri/src/engine.rs

@@ -28,6 +28,9 @@ fn resolve_quality(quality: &str) -> Option<QualityProfile> {
             frame_duration_ms: 20,
             frames_per_block: 5,
         }),
+        "studio-32k" => Some(QualityProfile::STUDIO_32K),
+        "studio-48k" => Some(QualityProfile::STUDIO_48K),
+        "studio-64k" => Some(QualityProfile::STUDIO_64K),
         _ => None, // "auto" or unknown
     }
 }
@@ -279,6 +282,9 @@ impl CallEngine {
                                 let new_profile = match pkt.header.codec_id {
                                     CodecId::Opus24k => QualityProfile::GOOD,
                                     CodecId::Opus6k => QualityProfile::DEGRADED,
+                                    CodecId::Opus32k => QualityProfile::STUDIO_32K,
+                                    CodecId::Opus48k => QualityProfile::STUDIO_48K,
+                                    CodecId::Opus64k => QualityProfile::STUDIO_64K,
                                     CodecId::Codec2_1200 => QualityProfile::CATASTROPHIC,
                                     CodecId::Codec2_3200 => QualityProfile {
                                         codec: CodecId::Codec2_3200,

desktop/src/main.ts

@@ -51,22 +51,20 @@ const sAgc = document.getElementById("s-agc") as HTMLInputElement;
 const sQuality = document.getElementById("s-quality") as HTMLInputElement;
 const sQualityLabel = document.getElementById("s-quality-label")!;
 
-// Quality slider config
-const QUALITY_STEPS = ["auto", "good", "degraded", "codec2-3200", "catastrophic"];
-const QUALITY_LABELS = ["Auto", "Opus 24k", "Opus 6k", "Codec2 3.2k", "Codec2 1.2k"];
-const QUALITY_COLORS = ["#4ade80", "#4ade80", "#facc15", "#e97320", "#991b1b"];
+// Quality slider config — best (left/green) to worst (right/red)
+const QUALITY_STEPS = ["studio-64k", "studio-48k", "studio-32k", "auto", "good", "degraded", "codec2-3200", "catastrophic"];
+const QUALITY_LABELS = ["Studio 64k", "Studio 48k", "Studio 32k", "Auto", "Opus 24k", "Opus 6k", "Codec2 3.2k", "Codec2 1.2k"];
+const QUALITY_COLORS = ["#22c55e", "#4ade80", "#86efac", "#a3e635", "#facc15", "#f59e0b", "#e97320", "#991b1b"];
 
 function qualityToIndex(q: string): number {
   const idx = QUALITY_STEPS.indexOf(q);
-  return idx >= 0 ? idx : 0;
+  return idx >= 0 ? idx : 3; // default to "auto" (index 3)
 }
 
 function updateQualityUI(index: number) {
   sQualityLabel.textContent = QUALITY_LABELS[index];
   sQualityLabel.style.color = QUALITY_COLORS[index];
-  const pct = index / (QUALITY_STEPS.length - 1);
-  // Gradient: green at left → yellow middle → dark red at right
-  sQuality.style.background = `linear-gradient(90deg, #4ade80 0%, #facc15 40%, #e97320 70%, #991b1b 100%)`;
+  sQuality.style.background = `linear-gradient(90deg, #22c55e 0%, #86efac 25%, #facc15 50%, #e97320 75%, #991b1b 100%)`;
 }
 
 sQuality.addEventListener("input", () => {