feat: compression

README.md

@@ -36,7 +36,8 @@ transui             # same as record
 
 Bind `transui record` to a shortcut in your desktop environment. Transui does
 not register a global shortcut itself. Press the same shortcut again to stop
-and transcribe the current recording.
+and transcribe the current recording. Audio is recorded as 16 kHz mono MP3 at
+32 kbps to keep uploads small.
 
 The **Hosted first, local fallback** setting tries the Hosted endpoint, then
 the Local endpoint when the first request fails. With it disabled, Transui uses

src/main.cpp

@@ -330,8 +330,8 @@ bool transcription_request(const std::string& url, const std::string& key,
   part = curl_mime_addpart(mime);
   curl_mime_name(part, "file");
   curl_mime_filedata(part, path.c_str());
-  curl_mime_filename(part, "recording.wav");
+  curl_mime_filename(part, "recording.mp3");
-  curl_mime_type(part, "audio/wav");
+  curl_mime_type(part, "audio/mpeg");
   if (!prompt.empty()) {
     part = curl_mime_addpart(mime);
     curl_mime_name(part, "prompt");
@@ -568,7 +568,9 @@ void start_recording(App* app) {
   app->recording_path = template_path;
   g_free(template_path);
   gchar* pipeline_text = g_strdup_printf(
-      "autoaudiosrc ! audioconvert ! audioresample ! wavenc ! filesink location=\"%s\"",
+      "autoaudiosrc ! audioconvert ! audioresample ! "
+      "audio/x-raw,format=S16LE,rate=16000,channels=1 ! "
+      "lamemp3enc target=bitrate bitrate=32 cbr=true ! filesink location=\"%s\"",
       app->recording_path.c_str());
   GError* error = nullptr;
   app->pipeline = gst_parse_launch(pipeline_text, &error);