Keep capture stream running between PTT utterances

tests/fake_sdl/SDL3/SDL.h

@@ -0,0 +1,22 @@
+#pragma once
+#include <cstdint>
+#include <vector>
+#define SDL_INIT_AUDIO 1
+#define SDL_AUDIO_F32 2
+#define SDL_AUDIO_DEVICE_DEFAULT_RECORDING 3
+#define SDL_EVENT_AUDIO_DEVICE_REMOVED 4
+using SDL_AudioDeviceID = unsigned;
+struct SDL_AudioSpec { int format, channels, freq; };
+struct SDL_AudioStream { std::vector<float> queued; };
+struct SDL_Event { int type; struct { bool recording; SDL_AudioDeviceID which; } adevice; };
+const char* SDL_GetError();
+bool SDL_InitSubSystem(int);
+void SDL_QuitSubSystem(int);
+SDL_AudioStream* SDL_OpenAudioDeviceStream(SDL_AudioDeviceID, const SDL_AudioSpec*, void*, void*);
+bool SDL_ResumeAudioStreamDevice(SDL_AudioStream*);
+SDL_AudioDeviceID SDL_GetAudioStreamDevice(SDL_AudioStream*);
+int SDL_GetAudioStreamAvailable(SDL_AudioStream*);
+int SDL_GetAudioStreamData(SDL_AudioStream*, void*, int);
+bool SDL_ClearAudioStream(SDL_AudioStream*);
+void SDL_DestroyAudioStream(SDL_AudioStream*);
+bool SDL_PollEvent(SDL_Event*);