From c68662a8c773da009d06ec4a1ae89c99fe5f20ed Mon Sep 17 00:00:00 2001
From: michael <michael@b3059339-0415-0410-9bf9-f77b7e298cf2>
Date: Thu, 21 Oct 2004 12:10:55 +0000
Subject: sine sweep generator

git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@13722 b3059339-0415-0410-9bf9-f77b7e298cf2
---
 libaf/af_sweep.c | 95 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 95 insertions(+)
 create mode 100644 libaf/af_sweep.c

(limited to 'libaf/af_sweep.c')

diff --git a/libaf/af_sweep.c b/libaf/af_sweep.c
new file mode 100644
index 0000000000..ee2c97ddb3
--- /dev/null
+++ b/libaf/af_sweep.c
@@ -0,0 +1,95 @@
+// Copyright (c) 2004 Michael Niedermayer <michaelni@gmx.at>
+// #inlcude <GPL_v2.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <inttypes.h>
+#include <math.h>
+
+#include "../config.h"
+#include "af.h"
+
+typedef struct af_sweep_s{
+    double x;
+    double delta;
+}af_sweept;
+
+
+// Initialization and runtime control
+static int control(struct af_instance_s* af, int cmd, void* arg)
+{
+  af_sweept* s   = (af_sweept*)af->setup; 
+  af_data_t *data= (af_data_t*)arg;
+
+  switch(cmd){
+  case AF_CONTROL_REINIT:
+    if(data->format != (AF_FORMAT_SI | AF_FORMAT_NE))
+       return AF_ERROR;
+
+    af->data->nch    = data->nch;
+    af->data->format = AF_FORMAT_SI | AF_FORMAT_NE;
+    af->data->bps    = 2;
+    af->data->rate   = data->rate;
+
+    return AF_OK;
+  case AF_CONTROL_COMMAND_LINE:
+    sscanf((char*)arg,"%lf", &s->delta);
+    return AF_OK;
+/*  case AF_CONTROL_RESAMPLE_RATE | AF_CONTROL_SET:
+    af->data->rate = *(int*)arg;
+    return AF_OK;*/
+  }
+  return AF_UNKNOWN;
+}
+
+// Deallocate memory 
+static void uninit(struct af_instance_s* af)
+{
+    if(af->data)
+        free(af->data);
+    if(af->setup){
+        af_sweept *s = af->setup;
+        free(s);
+    }
+}
+
+// Filter data through filter
+static af_data_t* play(struct af_instance_s* af, af_data_t* data)
+{    
+  af_sweept *s = af->setup;
+  int i, j;
+  int16_t *in = (int16_t*)data->audio;
+  int chans   = data->nch;
+  int in_len  = data->len/(2*chans);
+
+  for(i=0; i<in_len; i++){
+      for(j=0; j<chans; j++)
+          in[i*chans+j]= 32000*sin(s->x*s->x);
+      s->x += s->delta;
+      if(2*s->x*s->delta >= 3.141592) s->x=0;
+  }
+
+  return data;
+}
+
+static int open(af_instance_t* af){
+  af->control=control;
+  af->uninit=uninit;
+  af->play=play;
+  af->mul.n=1;
+  af->mul.d=1;
+  af->data=calloc(1,sizeof(af_data_t));
+  af->setup=calloc(1,sizeof(af_sweept));
+  return AF_OK;
+}
+
+af_info_t af_info_sweep = {
+  "sine sweep",
+  "sweep",
+  "Michael Niedermayer",
+  "",
+  AF_FLAGS_REENTRANT,
+  open
+};
+
-- 
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