sdl/new_sound.cpp: record audio with AVRecorder

src/i_sound.h

@@ -55,6 +55,10 @@ void I_StartupSound(void);
 */
 void I_ShutdownSound(void);
 
+/** \brief Update instance of AVRecorder for audio capture.
+*/
+void I_UpdateAudioRecorder(void);
+
 /// ------------------------
 ///  SFX I/O
 /// ------------------------

src/m_avrecorder.cpp

@@ -171,6 +171,8 @@ boolean M_AVRecorder_Open(const char* filename)
 
 		g_av_recorder = std::make_shared<AVRecorder>(cfg);
 
+		I_UpdateAudioRecorder();
+
 		return true;
 	}
 	catch (const std::exception& ex)
@@ -183,6 +185,8 @@ boolean M_AVRecorder_Open(const char* filename)
 void M_AVRecorder_Close(void)
 {
 	g_av_recorder.reset();
+
+	I_UpdateAudioRecorder();
 }
 
 const char* M_AVRecorder_GetFileExtension(void)

src/sdl/new_sound.cpp

@@ -21,6 +21,7 @@
 #include "../audio/sound_effect_player.hpp"
 #include "../cxxutil.hpp"
 #include "../io/streams.hpp"
+#include "../m_avrecorder.hpp"
 
 #include "../doomdef.h"
 #include "../i_sound.h"
@@ -57,6 +58,8 @@ static shared_ptr<Gain<2>> gain_music;
 
 static vector<shared_ptr<SoundEffectPlayer>> sound_effect_channels;
 
+static shared_ptr<srb2::media::AVRecorder> av_recorder;
+
 static void (*music_fade_callback)();
 
 void* I_GetSfx(sfxinfo_t* sfx)
@@ -135,6 +138,9 @@ void audio_callback(void* userdata, Uint8* buffer, int len)
 				std::clamp(float_buffer[i].amplitudes[1], -1.f, 1.f),
 			};
 		}
+
+		if (av_recorder)
+			av_recorder->push_audio_samples(tcb::span {float_buffer, float_len});
 	}
 	catch (...)
 	{
@@ -749,3 +755,11 @@ boolean I_FadeInPlaySong(UINT32 ms, boolean looping)
 	else
 		return false;
 }
+
+void I_UpdateAudioRecorder(void)
+{
+	// must be locked since av_recorder is used by audio_callback
+	SdlAudioLockHandle _;
+
+	av_recorder = g_av_recorder;
+}