Prevent radio capture from competing with a broadcast microphone

tools/chatgui/src/radio_audio_engine.cpp

@@ -203,13 +203,17 @@ void RadioAudioEngine::reconfigureCapture() {
 int RadioAudioEngine::start(quint64 groupId) {
     if (m_active && m_groupId == groupId) return 0;
     stop();
+    if (!m_microphone.acquire()) {
+        DEBUG_WARN(DEBUG_CATEGORY_RADIO, "RadioAudio: microphone owned by another operation"); return -1;
+    }
     auto* inst = gui_bridge_get_inst();
     if (!inst || radio_audio_start(groupId, 0) != 0) {
         DEBUG_ERROR(DEBUG_CATEGORY_RADIO, "RadioAudio: cannot start group=%016llx", (unsigned long long)groupId);
+        m_microphone.release();
         return -1;
     }
     m_groupId = groupId;
-    if (!m_voice.start(VoiceAudioIo::Kind::Radio, groupId)) { radio_audio_stop(); m_groupId = 0; return -1; }
+    if (!m_voice.start(VoiceAudioIo::Kind::Radio, groupId)) { radio_audio_stop(); m_groupId = 0; m_microphone.release(); return -1; }
     m_wantStereo = chat_setting_get_int(inst, "radio_capture_stereo", 0) != 0;
     m_active = true;
     m_capture.retryNow();
@@ -300,6 +304,7 @@ void RadioAudioEngine::pauseDevices() {
 void RadioAudioEngine::stop() {
     m_recoveryTimer.stop();
     pauseDevices(); m_voice.stop();
+    m_microphone.release();
     uint64_t group = m_groupId.exchange(0);
     bool talking = m_talking.exchange(false);
     m_buttonTalking = m_hotkeyTalking = false;

tools/chatgui/src/radio_audio_engine.h

@@ -5,6 +5,7 @@
 #include <cstdint>
 #include <vector>
 #include "audio_device.h"
+#include "audio_capture_lease.h"
 #include "voice_audio_io.h"
 #include <QTimer>
 #include <QMap>
@@ -92,6 +93,7 @@ private:
     std::atomic<uint64_t> m_groupId{0};
 
     AudioDevice m_capture;
+    AudioCaptureLease m_microphone;
     VoiceAudioIo m_voice;
     bool m_outputAttached = false;
     QTimer m_recoveryTimer;