add new component: user interface http server

work in progress which eventually will enable the user to configure dsp processor on the fly using an on device http server.

first try and possible fix for #22

Signed-off-by: Karl Osterseher <karli_o@gmx.at>

components/dsp_processor/include/dsp_processor.h

@@ -23,6 +23,10 @@ enum filtertypes {
   HIGHSHELF
 };
 
+// Each audio processor node consist of a data struct holding the
+// required weights and states for processing an automomous processing
+// function. The high level parameters is maintained in the structure
+// as well
 // Process node
 typedef struct ptype {
   int filtertype;
@@ -34,15 +38,28 @@ typedef struct ptype {
   float w[2];
 } ptype_t;
 
+// used to dynamically change used filters and their parameters
+typedef struct filterParams_s {
+  dspFlows_t dspFlow;
+  float fc_1;
+  float gain_1;
+  float fc_2;
+  float gain_2;
+  float fc_3;
+  float gain_3;
+} filterParams_t;
+
+// TODO: this is unused, remove???
 // Process flow
 typedef struct pnode {
   ptype_t process;
   struct pnode *next;
 } pnode_t;
 
-void dsp_setup_flow(double freq, uint32_t samplerate, uint32_t chunkInFrames);
-int dsp_processor(char *audio, size_t chunk_size, dspFlows_t dspFlow);
-void dsp_set_xoverfreq(uint8_t, uint8_t, uint32_t);
-void dsp_set_vol(double volume);
+void dsp_processor_init(void);
+void dsp_processor_uninit(void);
+int dsp_processor_worker(char *audio, size_t chunk_size, uint32_t samplerate);
+esp_err_t dsp_processor_update_filter_params(filterParams_t *params);
+void dsp_processor_set_volome(double volume);
 
 #endif /* _DSP_PROCESSOR_H_  */