[fix] fix crash when Stop() called in SpeakerCapturerLinux

src/speaker_capturer/linux/speaker_capturer_linux.h

@@ -1,12 +1,18 @@
 /*
  * @Author: DI JUNKUN
- * @Date: 2024-08-02
- * Copyright (c) 2024 by DI JUNKUN, All Rights Reserved.
+ * @Date: 2025-07-15
+ * Copyright (c) 2025 by DI JUNKUN, All Rights Reserved.
  */
 
 #ifndef _SPEAKER_CAPTURER_LINUX_H_
 #define _SPEAKER_CAPTURER_LINUX_H_
 
+#include <pulse/pulseaudio.h>
+
+#include <atomic>
+#include <functional>
+#include <mutex>
+#include <string>
 #include <thread>
 #include <vector>
 
@@ -17,22 +23,32 @@ class SpeakerCapturerLinux : public SpeakerCapturer {
   SpeakerCapturerLinux();
   ~SpeakerCapturerLinux();
 
- public:
-  virtual int Init(speaker_data_cb cb);
-  virtual int Destroy();
-  virtual int Start();
-  virtual int Stop();
+  int Init(speaker_data_cb cb) override;
+  int Destroy() override;
+  int Start() override;
+  int Stop() override;
 
   int Pause();
   int Resume();
 
  private:
-  speaker_data_cb cb_ = nullptr;
+  std::string GetDefaultMonitorSourceName();
+  void Cleanup();
 
  private:
-  bool inited_ = false;
-  // thread
-  std::thread capture_thread_;
+  speaker_data_cb cb_ = nullptr;
+
+  std::atomic<bool> inited_;
+  std::atomic<bool> paused_;
+  std::atomic<bool> stop_flag_;
+
+  std::thread mainloop_thread_;
+  pa_threaded_mainloop* mainloop_ = nullptr;
+  pa_context* context_ = nullptr;
+  pa_stream* stream_ = nullptr;
+
+  std::mutex state_mtx_;
+  std::vector<uint8_t> frame_cache_;
 };
 
 #endif