diff options
Diffstat (limited to 'src/emu/sound/flt_vol.c')
-rw-r--r-- | src/emu/sound/flt_vol.c | 80 |
1 files changed, 80 insertions, 0 deletions
diff --git a/src/emu/sound/flt_vol.c b/src/emu/sound/flt_vol.c new file mode 100644 index 00000000000..008db9cc471 --- /dev/null +++ b/src/emu/sound/flt_vol.c @@ -0,0 +1,80 @@ +#include "sndintrf.h" +#include "streams.h" +#include "flt_vol.h" + + +struct filter_volume_info +{ + sound_stream * stream; + int gain; +}; + + + +static void filter_volume_update(void *param, stream_sample_t **inputs, stream_sample_t **outputs, int samples) +{ + stream_sample_t *src = inputs[0]; + stream_sample_t *dst = outputs[0]; + struct filter_volume_info *info = param; + + while (samples--) + *dst++ = (*src++ * info->gain) >> 8; +} + + +static void *filter_volume_start(int sndindex, int clock, const void *config) +{ + struct filter_volume_info *info; + + info = auto_malloc(sizeof(*info)); + memset(info, 0, sizeof(*info)); + + info->gain = 0x100; + info->stream = stream_create(1, 1, Machine->sample_rate, info, filter_volume_update); + + return info; +} + + +void flt_volume_set_volume(int num, float volume) +{ + struct filter_volume_info *info = sndti_token(SOUND_FILTER_VOLUME, num); + info->gain = (int)(volume * 256); +} + + + +/************************************************************************** + * Generic get_info + **************************************************************************/ + +static void filter_volume_set_info(void *token, UINT32 state, sndinfo *info) +{ + switch (state) + { + /* no parameters to set */ + } +} + + +void filter_volume_get_info(void *token, UINT32 state, sndinfo *info) +{ + switch (state) + { + /* --- the following bits of info are returned as 64-bit signed integers --- */ + + /* --- the following bits of info are returned as pointers to data or functions --- */ + case SNDINFO_PTR_SET_INFO: info->set_info = filter_volume_set_info;break; + case SNDINFO_PTR_START: info->start = filter_volume_start; break; + case SNDINFO_PTR_STOP: /* Nothing */ break; + case SNDINFO_PTR_RESET: /* Nothing */ break; + + /* --- the following bits of info are returned as NULL-terminated strings --- */ + case SNDINFO_STR_NAME: info->s = "Volume Filter"; break; + case SNDINFO_STR_CORE_FAMILY: info->s = "Filters"; break; + case SNDINFO_STR_CORE_VERSION: info->s = "1.0"; break; + case SNDINFO_STR_CORE_FILE: info->s = __FILE__; break; + case SNDINFO_STR_CORE_CREDITS: info->s = "Copyright (c) 2004, The MAME Team"; break; + } +} + |