Applied all mainline PCem commits;

Removed SCSI thread waiting (except after executing the READ SUBCHANNEL command, to alleviate the effects of READ SUBCHANNEL spam done by CD players).

src/sound/snd_lpt_dss.c

@@ -0,0 +1,115 @@
+#include <stdlib.h>
+#include "../ibm.h"
+#include "../cpu/cpu.h"
+#include "filters.h"
+#include "../lpt.h"
+#include "snd_lpt_dss.h"
+#include "sound.h"
+#include "../timer.h"
+
+typedef struct dss_t
+{
+        uint8_t fifo[16];
+        int read_idx, write_idx;
+        
+        uint8_t dac_val;
+        
+        int time;
+        
+        int16_t buffer[SOUNDBUFLEN];
+        int pos;
+} dss_t;
+
+static void dss_update(dss_t *dss)
+{
+        for (; dss->pos < sound_pos_global; dss->pos++)
+                dss->buffer[dss->pos] = (int8_t)(dss->dac_val ^ 0x80) * 0x40;
+}
+
+
+static void dss_write_data(uint8_t val, void *p)
+{
+        dss_t *dss = (dss_t *)p;
+
+        timer_clock();
+
+        if ((dss->write_idx - dss->read_idx) < 16)
+        {
+                dss->fifo[dss->write_idx & 15] = val;
+                dss->write_idx++;
+        }
+}
+
+static void dss_write_ctrl(uint8_t val, void *p)
+{
+}
+
+static uint8_t dss_read_status(void *p)
+{
+        dss_t *dss = (dss_t *)p;
+
+        if ((dss->write_idx - dss->read_idx) >= 16)
+                return 0x40;
+        return 0;
+}
+
+
+static void dss_get_buffer(int32_t *buffer, int len, void *p)
+{
+        dss_t *dss = (dss_t *)p;
+        int c;
+        
+        dss_update(dss);
+        
+        for (c = 0; c < len*2; c += 2)
+        {
+                int16_t val = (int16_t)dss_iir((float)dss->buffer[c >> 1]);
+                
+                buffer[c] += val;
+                buffer[c+1] += val;
+        }
+
+        dss->pos = 0;
+}
+
+static void dss_callback(void *p)
+{
+        dss_t *dss = (dss_t *)p;
+
+        dss_update(dss);
+
+        if ((dss->write_idx - dss->read_idx) > 0)
+        {
+                dss->dac_val = dss->fifo[dss->read_idx & 15];
+                dss->read_idx++;
+        }
+        
+        dss->time += (TIMER_USEC * (1000000.0 / 7000.0));
+}
+
+static void *dss_init()
+{
+        dss_t *dss = malloc(sizeof(dss_t));
+        memset(dss, 0, sizeof(dss_t));
+
+        sound_add_handler(dss_get_buffer, dss);
+        timer_add(dss_callback, &dss->time, TIMER_ALWAYS_ENABLED, dss);
+                
+        return dss;
+}
+static void dss_close(void *p)
+{
+        dss_t *dss = (dss_t *)p;
+        
+        free(dss);
+}
+
+lpt_device_t dss_device =
+{
+        "Disney Sound Source",
+        dss_init,
+        dss_close,
+        dss_write_data,
+        dss_write_ctrl,
+        dss_read_status
+};