--- a/src/tts.mp3.luan	Wed Aug 13 10:31:24 2025 +0900
+++ b/src/tts.mp3.luan	Thu Aug 14 11:27:34 2025 +0900
@@ -1,43 +1,42 @@
 local Luan = require "luan:Luan.luan"
 local error = Luan.error
 local Parsers = require "luan:Parsers.luan"
-local xml_encode = Parsers.xml_encode or error()
+local json_string = Parsers.json_string or error()
 local Io = require "luan:Io.luan"
 local uri = Io.uri or error()
 local Http = require "luan:http/Http.luan"
 local Config = require "site:/private/Config.luan"
+local key = Config.chatgpt.key or error()
+local Logging = require "luan:logging/Logging.luan"
+local logger = Logging.logger "tts.js"
 
 
--- https://learn.microsoft.com/en-us/azure/ai-services/speech-service/index-text-to-speech
+-- https://platform.openai.com/docs/guides/text-to-speech
 
-local region = Config.azure_tts.region or error()
-local url = "https://"..region..".tts.speech.microsoft.com/cognitiveservices/v1"
+local url = "https://api.openai.com/v1/audio/speech"
 local headers = {
-	["Ocp-Apim-Subscription-Key"] = Config.azure_tts.key or error()
-	["Content-Type"] = "application/ssml+xml"
-	["X-Microsoft-OutputFormat"] = "audio-16khz-128kbitrate-mono-mp3"
+	Authorization = "Bearer "..key
+	["Content-Type"] = "application/json"
 }
 
-local function text_to_speech(lang,voice,text)
-	local xml = `%>
-<speak version='1.0' xml:lang='<%=lang%>'>
-    <voice name='<%=voice%>'>
-<%=		xml_encode(text) %>
-    </voice>
-</speak>
-<%	`
+local function text_to_speech(voice,instructions,text)
 	local options = {
 		method = "POST"
 		headers = headers
-		content = xml
+		content = json_string{
+			model = "gpt-4o-mini-tts"
+			voice = voice
+			input = text
+			instructions = instructions
+		}
 	}
 	return uri(url,options)
 end
 
 return function()
-	local lang = Http.request.parameters.lang or error()
 	local voice = Http.request.parameters.voice or error()
+	local instructions = Http.request.parameters.instructions or error()
 	local text = Http.request.parameters.text or error()
-	local input = text_to_speech(lang,voice,text)
+	local input = text_to_speech(voice,instructions,text)
 	Http.response.binary_writer().write_from(input)
 end