From a45e38afbb0857e69e9627f768a3ea84b83030b9 Mon Sep 17 00:00:00 2001
From: will wade <willwade@gmail.com>
Date: Sun, 16 Aug 2026 09:37:02 +0000
Subject: [PATCH] fix(google): pin MP3 output to 24 kHz

Without sampleRateHertz Google returns audio at each voice's natural
rate (22050/24000/32000 depending on model family), so downstream
consumers that receive bare PCM via on_audio cannot know the rate.
Pinning 24000 makes the delivery rate deterministic for every voice.
---
 src/cloud_engine.rs | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/cloud_engine.rs b/src/cloud_engine.rs
index 4904add..9b6f3e2 100644
--- a/src/cloud_engine.rs
+++ b/src/cloud_engine.rs
@@ -1102,7 +1102,10 @@ fn build_google_request(
     let mut body = serde_json::json!({
         "input": input,
         "voice": voice_obj,
-        "audioConfig": { "audioEncoding": "MP3" }
+        // sampleRateHertz is pinned so the decoded PCM rate is knowable by
+        // callers that receive bare bytes via on_audio (Google otherwise
+        // returns each voice's natural rate: 22050/24000/32000).
+        "audioConfig": { "audioEncoding": "MP3", "sampleRateHertz": 24000 }
     });
 
     if add_marks {