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authormichael <michael@b3059339-0415-0410-9bf9-f77b7e298cf2>2004-10-21 12:10:55 +0000
committermichael <michael@b3059339-0415-0410-9bf9-f77b7e298cf2>2004-10-21 12:10:55 +0000
commitc68662a8c773da009d06ec4a1ae89c99fe5f20ed (patch)
tree106dd760c5701d2e737b4b07513e7a2a85ffb32e /libaf/af_sweep.c
parent798d2d133780c000166f01fd2d7fbde395196be3 (diff)
downloadmpv-c68662a8c773da009d06ec4a1ae89c99fe5f20ed.tar.bz2
mpv-c68662a8c773da009d06ec4a1ae89c99fe5f20ed.tar.xz
sine sweep generator
git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@13722 b3059339-0415-0410-9bf9-f77b7e298cf2
Diffstat (limited to 'libaf/af_sweep.c')
-rw-r--r--libaf/af_sweep.c95
1 files changed, 95 insertions, 0 deletions
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
+};
+