Reset FM synthesis and PCM state on load

backends/playback/zsm/x16emu/ymglue.cpp

@@ -82,6 +82,14 @@ class ym2151_interface : public ymfm::ymfm_interface {
 		bool irq() {
 			return m_irq_status;
 		}
+        void reset() {
+            m_chip.reset();
+            m_timers[0] = 0;
+            m_timers[1] = 0;
+            m_busy_timer = 0;
+            m_irq_status = false;
+            opm_out.clear();
+        }
 
 	private:
 		ymfm::ym2151 m_chip;
@@ -114,6 +122,9 @@ extern "C" {
 	void YM_write_reg(uint8_t reg, uint8_t val) {
 		if (initialized) opm_iface.write(reg, val);
 	}
+    void YM_reset() {
+        opm_iface.reset();
+    }
 
 	uint8_t YM_read_status() {
 		if (initialized)

backends/playback/zsm/x16emu/ymglue.h

@@ -12,7 +12,7 @@ extern "C" {
 	void YM_stream_update(int16_t* output, uint32_t numsamples);
 	void YM_write_reg(uint8_t reg, uint8_t val);
 	bool YM_irq(void);
-
+    void YM_reset();
 #ifdef __cplusplus
 }
 #endif

backends/playback/zsm/zsm_backend.cpp

@@ -74,7 +74,9 @@ extern SDL_AudioSpec obtained;
 void ZsmBackend::switch_stream(int idx) {
     YM_Create(YM_FREQ);
     YM_init(YM_FREQ/64, 60);
+    YM_reset();
     psg_reset();
+    pcm_reset();
     for (uint8_t i = 0; i < 16; i++) {
         psg_writereg(i * 4 + 2, 0);
     }

backends/playback/zsm/zsm_backend.hpp

@@ -68,6 +68,8 @@ class ZsmBackend : public PlaybackBackend {
     DynPtr out_buf;
     DynPtr ym_buf;
     DynPtr ym_resample_buf;
+    bool ym_recorded = false;
+    uint8_t ym_data[256];
     uint32_t loop_rem;
     uint32_t pcm_data_offs;
     uint32_t loop;