Changeset 5269:b914e5b61703 in roaraudio for include/libroardsp/filters.h

Timestamp:

11/17/11 00:32:28 (12 years ago)

Author:

phi

Branch:

default

Phase:

public

Message:

start of a response curve filter

File:

• include/libroardsp/filters.h (modified) (3 diffs)

include/libroardsp/filters.h

@@ -68 +68 @@
  ROARDSP_CLIP_MODE_ZERO  = 1,
  ROARDSP_CLIP_MODE_WARP  = 2,
- ROARDSP_CLIP_MODE_NOISE  = 3,
+ ROARDSP_CLIP_MODE_NOISE = 3
 };
 
@@ -94 +94 @@
 };
 
+enum roardsp_responsecurve_mode {
+ ROARDSP_RESPONSECURVE_MODE_PASS = 0, /* pass:           o = i                   */
+ ROARDSP_RESPONSECURVE_MODE_LIN  = 1, /* linear:         o = -(1-i)^(N+1) + 1    */
+ ROARDSP_RESPONSECURVE_MODE_ILIN = 2, /* inverse linear: o = i**(N+1)            */
+ ROARDSP_RESPONSECURVE_MODE_SIN  = 3, /* sin:            o = sin(pi/2 * i)^N     */
+ ROARDSP_RESPONSECURVE_MODE_ISIN = 4, /* inverse sin:    o = 1-sin((1-i)*pi/2)^N */
+ ROARDSP_RESPONSECURVE_MODE_COS  = 5, /* cos:            o = 0.5-cos(i*pi)/2     */
+ ROARDSP_RESPONSECURVE_MODE_ICOS = 6, /* inverse cos:    o = 2*i-0.5+cos(i*pi)/2 */
+};
+
+struct roardsp_responsecurve {
+ enum roardsp_responsecurve_mode mode_pos, mode_neg;
+ int32_t N;
+};
 
 // filter:
@@ -176 +190 @@
 #endif
 
+int roardsp_responsecurve_init  (struct roardsp_filter * filter, struct roar_stream * stream, int id);
+int roardsp_responsecurve_uninit(struct roardsp_filter * filter);
+int roardsp_responsecurve_calc32(struct roardsp_filter * filter, void * data, size_t samples);
+int roardsp_responsecurve_calc16(struct roardsp_filter * filter, void * data, size_t samples);
+int roardsp_responsecurve_calc8 (struct roardsp_filter * filter, void * data, size_t samples);
+int roardsp_responsecurve_ctl   (struct roardsp_filter * filter, int cmd, void * data);
+int roardsp_responsecurve_reset (struct roardsp_filter * filter, int what);
 
 #endif