- merge with original master from jorgen

- minimize RAM usage of all components
- use both IRAM and DRAM in player component so we can buffer up to 1s on modules without SPI RAM
- support fragemented pcm chunks so we can use all available RAM if there isn't a big enough block available but still enough HEAP
- reinclude all components from jorgen's master branch
- add custom i2s driver to get a precise timing of initial sync
- change wrong usage of esp_timer for latency measurement of snapcast protocol
- add player component

components/dsp_processor/include/dsp_processor.h

@@ -0,0 +1,46 @@
+#ifndef _DSP_PROCESSOR_H_
+#define _DSP_PROCESSOR_H_
+
+typedef enum dspFlows {
+  dspfStereo,
+  dspfBiamp,
+  dspf2DOT1,
+  dspfFunkyHonda,
+  dspfBassBoost
+} dspFlows_t;
+
+enum filtertypes {
+  LPF,
+  HPF,
+  BPF,
+  BPF0DB,
+  NOTCH,
+  ALLPASS360,
+  ALLPASS180,
+  PEAKINGEQ,
+  LOWSHELF,
+  HIGHSHELF
+};
+
+// Process node
+typedef struct ptype {
+  int filtertype;
+  float freq;
+  float gain;
+  float q;
+  float *in, *out;
+  float coeffs[5];
+  float w[2];
+} ptype_t;
+
+// Process flow
+typedef struct pnode {
+  ptype_t process;
+  struct pnode *next;
+} pnode_t;
+
+void dsp_setup_flow(double freq, uint32_t samplerate);
+int dsp_processor(char *audio, size_t chunk_size, dspFlows_t dspFlow);
+void dsp_set_xoverfreq(uint8_t, uint8_t, uint32_t);
+
+#endif /* _DSP_PROCESSOR_H_  */