diff options
Diffstat (limited to 'trunk/src/emu/sound/2413intf.c')
-rw-r--r-- | trunk/src/emu/sound/2413intf.c | 145 |
1 files changed, 145 insertions, 0 deletions
diff --git a/trunk/src/emu/sound/2413intf.c b/trunk/src/emu/sound/2413intf.c new file mode 100644 index 00000000000..ab4c738a1dc --- /dev/null +++ b/trunk/src/emu/sound/2413intf.c @@ -0,0 +1,145 @@ +/**************************************************************** + + MAME / MESS functions + +****************************************************************/ + +#include "emu.h" +#include "ym2413.h" +#include "2413intf.h" + + +/* for stream system */ +typedef struct _ym2413_state ym2413_state; +struct _ym2413_state +{ + sound_stream * stream; + void * chip; +}; + + +INLINE ym2413_state *get_safe_token(device_t *device) +{ + assert(device != NULL); + assert(device->type() == YM2413); + return (ym2413_state *)downcast<legacy_device_base *>(device)->token(); +} + + +#ifdef UNUSED_FUNCTION +void YM2413DAC_update(int chip,stream_sample_t **inputs, stream_sample_t **_buffer,int length) +{ + INT16 *buffer = _buffer[0]; + static int out = 0; + + if ( ym2413[chip].reg[0x0F] & 0x01 ) + { + out = ((ym2413[chip].reg[0x10] & 0xF0) << 7); + } + while (length--) *(buffer++) = out; +} +#endif + +static STREAM_UPDATE( ym2413_stream_update ) +{ + ym2413_state *info = (ym2413_state *)param; + ym2413_update_one(info->chip, outputs, samples); +} + +static void _stream_update(void *param, int interval) +{ + ym2413_state *info = (ym2413_state *)param; + info->stream->update(); +} + +static DEVICE_START( ym2413 ) +{ + ym2413_state *info = get_safe_token(device); + int rate = device->clock()/72; + + /* emulator create */ + info->chip = ym2413_init(device, device->clock(), rate); + assert_always(info->chip != NULL, "Error creating YM2413 chip"); + + /* stream system initialize */ + info->stream = device->machine().sound().stream_alloc(*device,0,2,rate,info,ym2413_stream_update); + + ym2413_set_update_handler(info->chip, _stream_update, info); + + + + +#if 0 + int i, tst; + char name[40]; + + num = intf->num; + + tst = YM3812_sh_start (msound); + if (tst) + return 1; + + for (i=0;i<num;i++) + { + ym2413_reset (i); + + ym2413[i].DAC_stream = device->machine().sound().stream_alloc(*device, 0, 1, device->clock()/72, i, YM2413DAC_update); + + if (ym2413[i].DAC_stream == -1) + return 1; + } + return 0; +#endif + +} + +static DEVICE_STOP( ym2413 ) +{ + ym2413_state *info = get_safe_token(device); + ym2413_shutdown(info->chip); +} + +static DEVICE_RESET( ym2413 ) +{ + ym2413_state *info = get_safe_token(device); + ym2413_reset_chip(info->chip); +} + + +WRITE8_DEVICE_HANDLER( ym2413_w ) +{ + ym2413_state *info = get_safe_token(device); + ym2413_write(info->chip, offset & 1, data); +} + +WRITE8_DEVICE_HANDLER( ym2413_register_port_w ) { ym2413_w(device, 0, data); } +WRITE8_DEVICE_HANDLER( ym2413_data_port_w ) { ym2413_w(device, 1, data); } + + +/************************************************************************** + * Generic get_info + **************************************************************************/ + +DEVICE_GET_INFO( ym2413 ) +{ + switch (state) + { + /* --- the following bits of info are returned as 64-bit signed integers --- */ + case DEVINFO_INT_TOKEN_BYTES: info->i = sizeof(ym2413_state); break; + + /* --- the following bits of info are returned as pointers to data or functions --- */ + case DEVINFO_FCT_START: info->start = DEVICE_START_NAME( ym2413 ); break; + case DEVINFO_FCT_STOP: info->stop = DEVICE_STOP_NAME( ym2413 ); break; + case DEVINFO_FCT_RESET: info->reset = DEVICE_RESET_NAME( ym2413 ); break; + + /* --- the following bits of info are returned as NULL-terminated strings --- */ + case DEVINFO_STR_NAME: strcpy(info->s, "YM2413"); break; + case DEVINFO_STR_FAMILY: strcpy(info->s, "Yamaha FM"); break; + case DEVINFO_STR_VERSION: strcpy(info->s, "1.0"); break; + case DEVINFO_STR_SOURCE_FILE: strcpy(info->s, __FILE__); break; + case DEVINFO_STR_CREDITS: strcpy(info->s, "Copyright Nicola Salmoria and the MAME Team"); break; + } +} + + +DEFINE_LEGACY_SOUND_DEVICE(YM2413, ym2413); |