Added NSF decoder plugin. Fixes 151192.

Original commit message from CVS:
Based on patches by: Johan Dahlin <johan at gnome dot org>
Ronald Bultje <rbultje at ronald dot bitfreak dot net>
* configure.ac:
* gst/nsf/Makefile.am:
* gst/nsf/dis6502.h:
* gst/nsf/fds_snd.c:
* gst/nsf/fds_snd.h:
* gst/nsf/fmopl.c:
* gst/nsf/fmopl.h:
* gst/nsf/gstnsf.c:
* gst/nsf/gstnsf.h:
* gst/nsf/log.c:
* gst/nsf/log.h:
* gst/nsf/memguard.c:
* gst/nsf/memguard.h:
* gst/nsf/mmc5_snd.c:
* gst/nsf/mmc5_snd.h:
* gst/nsf/nes6502.c:
* gst/nsf/nes6502.h:
* gst/nsf/nes_apu.c:
* gst/nsf/nes_apu.h:
* gst/nsf/nsf.c:
* gst/nsf/nsf.h:
* gst/nsf/osd.h:
* gst/nsf/types.h:
* gst/nsf/vrc7_snd.c:
* gst/nsf/vrc7_snd.h:
* gst/nsf/vrcvisnd.c:
* gst/nsf/vrcvisnd.h:
Added NSF decoder plugin. Fixes 151192.

1 files changed, 241 insertions, 0 deletions

diff --git a/gst/nsf/vrcvisnd.c b/gst/nsf/vrcvisnd.c
new file mode 100644
index 00000000..e6b5eb3e
--- /dev/null
+++ b/gst/nsf/vrcvisnd.c
@@ -0,0 +1,241 @@
+/*
+** Nofrendo (c) 1998-2000 Matthew Conte (matt@conte.com)
+**
+**
+** This program is free software; you can redistribute it and/or
+** modify it under the terms of version 2 of the GNU Library General 
+** Public License as published by the Free Software Foundation.
+**
+** This program is distributed in the hope that it will be useful, 
+** but WITHOUT ANY WARRANTY; without even the implied warranty of
+** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU 
+** Library General Public License for more details.  To obtain a 
+** copy of the GNU Library General Public License, write to the Free 
+** Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+**
+** Any permitted reproduction of these routines, in whole or in part,
+** must bear this legend.
+**
+**
+** vrcvisnd.c
+**
+** VRCVI sound hardware emulation
+** $Id$
+*/
+
+#include "types.h"
+#include "vrcvisnd.h"
+#include "nes_apu.h"
+
+
+static vrcvisnd_t vrcvi;
+static int32 vrcvi_incsize;
+
+/* VRCVI rectangle wave generation */
+static int32
+vrcvi_rectangle (vrcvirectangle_t * chan)
+{
+  /* reg0: 0-3=volume, 4-6=duty cycle
+   ** reg1: 8 bits of freq
+   ** reg2: 0-3=high freq, 7=enable
+   */
+
+  chan->phaseacc -= vrcvi_incsize;      /* # of clocks per wave cycle */
+  while (chan->phaseacc < 0) {
+    chan->phaseacc += chan->freq;
+    chan->adder = (chan->adder + 1) & 0x0F;
+  }
+
+  /* return if not enabled */
+  if (FALSE == chan->enabled)
+    return 0;
+
+  if (chan->adder < chan->duty_flip)
+    return -(chan->volume);
+  else
+    return chan->volume;
+}
+
+/* VRCVI sawtooth wave generation */
+static int32
+vrcvi_sawtooth (vrcvisawtooth_t * chan)
+{
+  /* reg0: 0-5=phase accumulator bits
+   ** reg1: 8 bits of freq
+   ** reg2: 0-3=high freq, 7=enable
+   */
+
+  chan->phaseacc -= vrcvi_incsize;      /* # of clocks per wav cycle */
+  while (chan->phaseacc < 0) {
+    chan->phaseacc += chan->freq;
+    chan->output_acc += chan->volume;
+
+    if (7 == ++chan->adder) {
+      chan->adder = 0;
+      chan->output_acc = 0;
+    }
+  }
+
+  /* return if not enabled */
+  if (FALSE == chan->enabled)
+    return 0;
+  else
+    return (chan->output_acc >> 3) << 9;
+}
+
+/* mix vrcvi sound channels together */
+static int32
+vrcvi_process (void)
+{
+  int32 output;
+
+  output = vrcvi_rectangle (&vrcvi.rectangle[0]);
+  output += vrcvi_rectangle (&vrcvi.rectangle[1]);
+  output += vrcvi_sawtooth (&vrcvi.saw);
+
+  return output;
+}
+
+/* write to registers */
+static void
+vrcvi_write (uint32 address, uint8 value)
+{
+  int chan;
+
+  switch (address & 0xB003) {
+    case 0x9000:
+    case 0xA000:
+      chan = (address >> 12) - 9;
+      vrcvi.rectangle[chan].reg[0] = value;
+      vrcvi.rectangle[chan].volume = (value & 0x0F) << 8;
+      vrcvi.rectangle[chan].duty_flip = (value >> 4) + 1;
+      break;
+    case 0x9001:
+    case 0xA001:
+      chan = (address >> 12) - 9;
+      vrcvi.rectangle[chan].reg[1] = value;
+      vrcvi.rectangle[chan].freq =
+          APU_TO_FIXED (((vrcvi.rectangle[chan].reg[2] & 0x0F) << 8) + value +
+          1);
+      break;
+    case 0x9002:
+    case 0xA002:
+      chan = (address >> 12) - 9;
+      vrcvi.rectangle[chan].reg[2] = value;
+      vrcvi.rectangle[chan].freq =
+          APU_TO_FIXED (((value & 0x0F) << 8) + vrcvi.rectangle[chan].reg[1] +
+          1);
+      vrcvi.rectangle[chan].enabled = (value & 0x80) ? TRUE : FALSE;
+      break;
+    case 0xB000:
+      vrcvi.saw.reg[0] = value;
+      vrcvi.saw.volume = value & 0x3F;
+      break;
+    case 0xB001:
+      vrcvi.saw.reg[1] = value;
+      vrcvi.saw.freq =
+          APU_TO_FIXED ((((vrcvi.saw.reg[2] & 0x0F) << 8) + value + 1) << 1);
+      break;
+    case 0xB002:
+      vrcvi.saw.reg[2] = value;
+      vrcvi.saw.freq =
+          APU_TO_FIXED ((((value & 0x0F) << 8) + vrcvi.saw.reg[1] + 1) << 1);
+      vrcvi.saw.enabled = (value & 0x80) ? TRUE : FALSE;
+      break;
+    default:
+      break;
+  }
+}
+
+/* reset state of vrcvi sound channels */
+static void
+vrcvi_reset (void)
+{
+  int i;
+
+  /* preload regs */
+  for (i = 0; i < 3; i++) {
+    vrcvi_write (0x9000 + i, 0);
+    vrcvi_write (0xA000 + i, 0);
+    vrcvi_write (0xB000 + i, 0);
+  }
+
+  /* get the phase period from the apu */
+  vrcvi_incsize = apu_getcyclerate ();
+}
+
+static void
+vrcvi_dummy (void)
+{
+}
+
+static apu_memwrite vrcvi_memwrite[] = {
+  /*   { 0x4040, 0x4092, ext_write }, *//* FDS sound regs */
+  {0x9000, 0x9002, vrcvi_write},        /* vrc6 */
+  {0xA000, 0xA002, vrcvi_write},
+  {0xB000, 0xB002, vrcvi_write},
+  {-1, -1, NULL}
+};
+
+apuext_t vrcvi_ext = {
+  vrcvi_dummy,                  /* no init */
+  vrcvi_dummy,                  /* no shutdown */
+  vrcvi_reset,
+  vrcvi_process,
+  NULL,                         /* no reads */
+  vrcvi_memwrite
+};
+
+/*
+** $Log$
+** Revision 1.1  2006/07/13 15:07:28  wtay
+** Based on patches by: Johan Dahlin <johan at gnome dot org>
+** Ronald Bultje <rbultje at ronald dot bitfreak dot net>
+** * configure.ac:
+** * gst/nsf/Makefile.am:
+** * gst/nsf/dis6502.h:
+** * gst/nsf/fds_snd.c:
+** * gst/nsf/fds_snd.h:
+** * gst/nsf/fmopl.c:
+** * gst/nsf/fmopl.h:
+** * gst/nsf/gstnsf.c:
+** * gst/nsf/gstnsf.h:
+** * gst/nsf/log.c:
+** * gst/nsf/log.h:
+** * gst/nsf/memguard.c:
+** * gst/nsf/memguard.h:
+** * gst/nsf/mmc5_snd.c:
+** * gst/nsf/mmc5_snd.h:
+** * gst/nsf/nes6502.c:
+** * gst/nsf/nes6502.h:
+** * gst/nsf/nes_apu.c:
+** * gst/nsf/nes_apu.h:
+** * gst/nsf/nsf.c:
+** * gst/nsf/nsf.h:
+** * gst/nsf/osd.h:
+** * gst/nsf/types.h:
+** * gst/nsf/vrc7_snd.c:
+** * gst/nsf/vrc7_snd.h:
+** * gst/nsf/vrcvisnd.c:
+** * gst/nsf/vrcvisnd.h:
+** Added NSF decoder plugin. Fixes 151192.
+**
+** Revision 1.9  2000/07/04 04:51:41  matt
+** cleanups
+**
+** Revision 1.8  2000/07/03 02:18:53  matt
+** much better external module exporting
+**
+** Revision 1.7  2000/06/20 04:06:16  matt
+** migrated external sound definition to apu module
+**
+** Revision 1.6  2000/06/20 00:08:58  matt
+** changed to driver based API
+**
+** Revision 1.5  2000/06/09 16:49:02  matt
+** removed all floating point from sound generation
+**
+** Revision 1.4  2000/06/09 15:12:28  matt
+** initial revision
+**
+*/