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Diffstat (limited to 'src/libxineadec/nosefart/mmc5_snd.c')
-rw-r--r--src/libxineadec/nosefart/mmc5_snd.c360
1 files changed, 0 insertions, 360 deletions
diff --git a/src/libxineadec/nosefart/mmc5_snd.c b/src/libxineadec/nosefart/mmc5_snd.c
deleted file mode 100644
index 7269fa967..000000000
--- a/src/libxineadec/nosefart/mmc5_snd.c
+++ /dev/null
@@ -1,360 +0,0 @@
-/*
-** 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.
-**
-**
-** mmc5_snd.c
-**
-** Nintendo MMC5 sound emulation
-** $Id: mmc5_snd.c,v 1.2 2003/12/05 15:55:01 f1rmb Exp $
-*/
-
-#include <string.h>
-#include "types.h"
-#include "mmc5_snd.h"
-#include "nes_apu.h"
-
-/* TODO: encapsulate apu/mmc5 rectangle */
-
-#define APU_OVERSAMPLE
-#define APU_VOLUME_DECAY(x) ((x) -= ((x) >> 7))
-
-
-typedef struct mmc5dac_s
-{
- int32 output;
- boolean enabled;
-} mmc5dac_t;
-
-
-/* look up table madness */
-static int32 decay_lut[16];
-static int vbl_lut[32];
-
-/* various sound constants for sound emulation */
-/* vblank length table used for rectangles, triangle, noise */
-static const uint8 vbl_length[32] =
-{
- 5, 127, 10, 1, 19, 2, 40, 3, 80, 4, 30, 5, 7, 6, 13, 7,
- 6, 8, 12, 9, 24, 10, 48, 11, 96, 12, 36, 13, 8, 14, 16, 15
-};
-
-/* ratios of pos/neg pulse for rectangle waves
-** 2/16 = 12.5%, 4/16 = 25%, 8/16 = 50%, 12/16 = 75%
-** (4-bit adder in rectangles, hence the 16)
-*/
-static const int duty_lut[4] =
-{
- 2, 4, 8, 12
-};
-
-
-static int32 mmc5_incsize;
-static uint8 mul[2];
-static mmc5rectangle_t mmc5rect[2];
-static mmc5dac_t mmc5dac;
-
-#define MMC5_RECTANGLE_OUTPUT chan->output_vol
-static int32 mmc5_rectangle(mmc5rectangle_t *chan)
-{
- int32 output;
-
-#ifdef APU_OVERSAMPLE
- int num_times;
- int32 total;
-#endif /* APU_OVERSAMPLE */
-
- /* reg0: 0-3=volume, 4=envelope, 5=hold, 6-7=duty cycle
- ** reg1: 0-2=sweep shifts, 3=sweep inc/dec, 4-6=sweep length, 7=sweep on
- ** reg2: 8 bits of freq
- ** reg3: 0-2=high freq, 7-4=vbl length counter
- */
-
- APU_VOLUME_DECAY(chan->output_vol);
-
- if (FALSE == chan->enabled || 0 == chan->vbl_length)
- return MMC5_RECTANGLE_OUTPUT;
-
- /* vbl length counter */
- if (FALSE == chan->holdnote)
- chan->vbl_length--;
-
- /* envelope decay at a rate of (env_delay + 1) / 240 secs */
- chan->env_phase -= 4; /* 240/60 */
- while (chan->env_phase < 0)
- {
- chan->env_phase += chan->env_delay;
-
- if (chan->holdnote)
- chan->env_vol = (chan->env_vol + 1) & 0x0F;
- else if (chan->env_vol < 0x0F)
- chan->env_vol++;
- }
-
- if (chan->freq < APU_TO_FIXED(4))
- return MMC5_RECTANGLE_OUTPUT;
-
- chan->phaseacc -= mmc5_incsize; /* # of cycles per sample */
- if (chan->phaseacc >= 0)
- return MMC5_RECTANGLE_OUTPUT;
-
-#ifdef APU_OVERSAMPLE
- num_times = total = 0;
-
- if (chan->fixed_envelope)
- output = chan->volume << 8; /* fixed volume */
- else
- output = (chan->env_vol ^ 0x0F) << 8;
-#endif
-
- while (chan->phaseacc < 0)
- {
- chan->phaseacc += chan->freq;
- chan->adder = (chan->adder + 1) & 0x0F;
-
-#ifdef APU_OVERSAMPLE
- if (chan->adder < chan->duty_flip)
- total += output;
- else
- total -= output;
-
- num_times++;
-#endif
- }
-
-#ifdef APU_OVERSAMPLE
- chan->output_vol = total / num_times;
-#else
- if (chan->fixed_envelope)
- output = chan->volume << 8; /* fixed volume */
- else
- output = (chan->env_vol ^ 0x0F) << 8;
-
- if (0 == chan->adder)
- chan->output_vol = output;
- else if (chan->adder == chan->duty_flip)
- chan->output_vol = -output;
-#endif
-
- return MMC5_RECTANGLE_OUTPUT;
-}
-
-static uint8 mmc5_read(uint32 address)
-{
- uint32 retval;
-
- retval = (uint32) (mul[0] * mul[1]);
-
- switch (address)
- {
- case 0x5205:
- return (uint8) retval;
-
- case 0x5206:
- return (uint8) (retval >> 8);
-
- default:
- return 0xFF;
- }
-}
-
-/* mix vrcvi sound channels together */
-static int32 mmc5_process(void)
-{
- int32 accum;
-
- accum = mmc5_rectangle(&mmc5rect[0]);
- accum += mmc5_rectangle(&mmc5rect[1]);
- if (mmc5dac.enabled)
- accum += mmc5dac.output;
-
- return accum;
-}
-
-/* write to registers */
-static void mmc5_write(uint32 address, uint8 value)
-{
- int chan;
-
- switch (address)
- {
- /* rectangles */
- case MMC5_WRA0:
- case MMC5_WRB0:
- chan = (address & 4) ? 1 : 0;
- mmc5rect[chan].regs[0] = value;
-
- mmc5rect[chan].volume = value & 0x0F;
- mmc5rect[chan].env_delay = decay_lut[value & 0x0F];
- mmc5rect[chan].holdnote = (value & 0x20) ? TRUE : FALSE;
- mmc5rect[chan].fixed_envelope = (value & 0x10) ? TRUE : FALSE;
- mmc5rect[chan].duty_flip = duty_lut[value >> 6];
- break;
-
- case MMC5_WRA1:
- case MMC5_WRB1:
- break;
-
- case MMC5_WRA2:
- case MMC5_WRB2:
- chan = (address & 4) ? 1 : 0;
- mmc5rect[chan].regs[2] = value;
- if (mmc5rect[chan].enabled)
- mmc5rect[chan].freq = APU_TO_FIXED((((mmc5rect[chan].regs[3] & 7) << 8) + value) + 1);
- break;
-
- case MMC5_WRA3:
- case MMC5_WRB3:
- chan = (address & 4) ? 1 : 0;
- mmc5rect[chan].regs[3] = value;
-
- if (mmc5rect[chan].enabled)
- {
- mmc5rect[chan].vbl_length = vbl_lut[value >> 3];
- mmc5rect[chan].env_vol = 0;
- mmc5rect[chan].freq = APU_TO_FIXED((((value & 7) << 8) + mmc5rect[chan].regs[2]) + 1);
- mmc5rect[chan].adder = 0;
- }
- break;
-
- case MMC5_SMASK:
- if (value & 0x01)
- mmc5rect[0].enabled = TRUE;
- else
- {
- mmc5rect[0].enabled = FALSE;
- mmc5rect[0].vbl_length = 0;
- }
-
- if (value & 0x02)
- mmc5rect[1].enabled = TRUE;
- else
- {
- mmc5rect[1].enabled = FALSE;
- mmc5rect[1].vbl_length = 0;
- }
-
- break;
-
- case 0x5010:
- if (value & 0x01)
- mmc5dac.enabled = TRUE;
- else
- mmc5dac.enabled = FALSE;
- break;
-
- case 0x5011:
- mmc5dac.output = (value ^ 0x80) << 8;
- break;
-
- case 0x5205:
- mul[0] = value;
- break;
-
- case 0x5206:
- mul[1] = value;
- break;
-
- default:
- break;
- }
-}
-
-/* reset state of vrcvi sound channels */
-static void mmc5_reset(void)
-{
- int i;
-
- /* get the phase period from the apu */
- mmc5_incsize = apu_getcyclerate();
-
- for (i = 0x5000; i < 0x5008; i++)
- mmc5_write(i, 0);
-
- mmc5_write(0x5010, 0);
- mmc5_write(0x5011, 0);
-}
-
-static void mmc5_init(void)
-{
- int i;
- int num_samples = apu_getcontext()->num_samples;
-
- /* lut used for enveloping and frequency sweeps */
- for (i = 0; i < 16; i++)
- decay_lut[i] = num_samples * (i + 1);
-
- /* used for note length, based on vblanks and size of audio buffer */
- for (i = 0; i < 32; i++)
- vbl_lut[i] = vbl_length[i] * num_samples;
-}
-
-/* TODO: bleh */
-static void mmc5_shutdown(void)
-{
-}
-
-static apu_memread mmc5_memread[] =
-{
- { 0x5205, 0x5206, mmc5_read },
- { -1, -1, NULL }
-};
-
-static apu_memwrite mmc5_memwrite[] =
-{
- { 0x5000, 0x5015, mmc5_write },
- { 0x5205, 0x5206, mmc5_write },
- { -1, -1, NULL }
-};
-
-apuext_t mmc5_ext =
-{
- mmc5_init,
- mmc5_shutdown,
- mmc5_reset,
- mmc5_process,
- mmc5_memread,
- mmc5_memwrite
-};
-
-/*
-** $Log: mmc5_snd.c,v $
-** Revision 1.2 2003/12/05 15:55:01 f1rmb
-** cleanup phase II. use xprintf when it's relevant, use xine_xmalloc when it's relevant too. Small other little fix (can't remember). Change few internal function prototype because it xine_t pointer need to be used if some xine's internal sections. NOTE: libdvd{nav,read} is still too noisy, i will take a look to made it quit, without invasive changes. To be continued...
-**
-** Revision 1.1 2003/01/08 07:04:35 tmmm
-** initial import of Nosefart sources
-**
-** Revision 1.6 2000/07/04 04:51:41 matt
-** cleanups
-**
-** Revision 1.5 2000/07/03 02:18:53 matt
-** much better external module exporting
-**
-** Revision 1.4 2000/06/28 22:03:51 matt
-** fixed stupid oversight
-**
-** Revision 1.3 2000/06/20 20:46:58 matt
-** minor cleanups
-**
-** Revision 1.2 2000/06/20 04:06:16 matt
-** migrated external sound definition to apu module
-**
-** Revision 1.1 2000/06/20 00:06:47 matt
-** initial revision
-**
-*/
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