Reduce Linux voice capture latency and verify device timing

tools/chatgui/src/audio_device.cpp

@@ -12,6 +12,18 @@ extern "C" void audio_stream_log_route(ma_device* device, int capture);
 AudioDevice::AudioDevice() { m_clock.start(); }
 AudioDevice::~AudioDevice() { close(); }
 
+void AudioDevice::requestLowLatency(ma_context* context, ma_device_config& config) {
+#ifdef __linux__
+    if (context && context->backend == ma_backend_pulseaudio) {
+        // Период I/O не зависит от размера кадра AEC/кодека; сервер согласует фактический буфер.
+        config.periodSizeInFrames = 0;
+        config.periodSizeInMilliseconds = 10;
+    }
+#else
+    (void)context; (void)config;
+#endif
+}
+
 bool AudioDevice::init(ma_context* context, ma_device_config config, const char* role, uint64_t session, Callback callback) {
     close();
     m_role = role;
@@ -22,6 +34,8 @@ bool AudioDevice::init(ma_context* context, ma_device_config config, const char*
     config.noFixedSizedCallback = MA_TRUE; // Аппаратные чанки не требуют скрытого накопителя miniaudio.
     config.notificationCallback = notification;
     config.pUserData = this;
+    DEBUG_INFO(DEBUG_CATEGORY_CALL, "audio: %s requested backend=%s rate=%u period_frames=%u period_ms=%u",
+               role, ma_get_backend_name(context->backend), config.sampleRate, config.periodSizeInFrames, config.periodSizeInMilliseconds);
     ma_result result = ma_device_init(context, &config, device);
     if (result != MA_SUCCESS) {
         DEBUG_ERROR(DEBUG_CATEGORY_CALL, "audio: %s init failed result=%d", role, result);

tools/chatgui/src/audio_device.h

@@ -14,6 +14,7 @@ public:
     ~AudioDevice();
     AudioDevice(const AudioDevice&) = delete;
     AudioDevice& operator=(const AudioDevice&) = delete;
+    static void requestLowLatency(ma_context* context, ma_device_config& config);
     bool init(ma_context* context, ma_device_config config, const char* role, uint64_t session, Callback callback);
     bool start();
     void pause(); // GUI: завершает текущий callback, сохраняя backend stream и его физический route.

tools/chatgui/src/call_audio_engine.cpp

@@ -59,8 +59,8 @@ bool CallAudioEngine::openCapture() {
     if (!context) return false;
     ma_device_config config = ma_device_config_init(ma_device_type_capture);
     config.capture.format = ma_format_s16; config.capture.channels = 1; config.sampleRate = CALL_AUDIO_SAMPLE_RATE;
-    config.periodSizeInMilliseconds = CALL_AUDIO_FRAME_MS;
-    DEBUG_INFO(DEBUG_CATEGORY_CALL, "CallAudio: capture requested period=%dms; actual period reported by device", CALL_AUDIO_FRAME_MS);
+    config.periodSizeInMilliseconds = 20; // Прежний запрос для остальных платформ/backends.
+    AudioDevice::requestLowLatency(context, config);
     ma_device_id id;
     bool selected = SoundManager::deviceId(m_captureId, &id);
     if (selected) config.capture.pDeviceID = &id;

tools/chatgui/src/radio_audio_engine.cpp

@@ -232,6 +232,7 @@ void RadioAudioEngine::openCapture() {
         config.capture.format = ma_format_s16;
         config.capture.channels = channels;
         config.sampleRate = RADIO_AUDIO_SAMPLE_RATE;
+        AudioDevice::requestLowLatency(context, config);
         auto callback = [this](const void* in, void*, unsigned int frames) { captureCallback(in, frames); };
         ma_device_id id;
         bool selected = SoundManager::deviceId(m_captureId, &id);