diff options
Diffstat (limited to 'src/libs/sig/ops_expand.c')
-rw-r--r-- | src/libs/sig/ops_expand.c | 56 |
1 files changed, 56 insertions, 0 deletions
diff --git a/src/libs/sig/ops_expand.c b/src/libs/sig/ops_expand.c new file mode 100644 index 0000000..76791e4 --- /dev/null +++ b/src/libs/sig/ops_expand.c @@ -0,0 +1,56 @@ +#include <assert.h> + +#include "sig.h" + + +typedef struct ops_expand_ctxt_t { + sig_t *value; +} ops_expand_ctxt_t; + + +static size_t ops_expand_size(va_list ap) +{ + return sizeof(ops_expand_ctxt_t); +} + + +/* expects a single sig_t: value + * input range is assumed to be 0..1, outputs expanded + * range of -1..+1 + */ +static void ops_expand_init(void *context, va_list ap) +{ + ops_expand_ctxt_t *ctxt = context; + + assert(ctxt); + + ctxt->value = va_arg(ap, sig_t *); +} + + +static void ops_expand_destroy(void *context) +{ + ops_expand_ctxt_t *ctxt = context; + + assert(ctxt); + + sig_free(ctxt->value); +} + + +static float ops_expand_output(void *context, unsigned ticks_ms) +{ + ops_expand_ctxt_t *ctxt = context; + + assert(ctxt); + + return sig_output(ctxt->value, ticks_ms) * 2.f + 1.f; +} + + +sig_ops_t sig_ops_expand = { + .size = ops_expand_size, + .init = ops_expand_init, + .destroy = ops_expand_destroy, + .output = ops_expand_output, +}; |