- optimize buffer sizes for latency and synchronization and i2s

- drop ADF pipeline stuff related to playback, this introduced too much non deterministic delay
- add fast median calculation component
- increase LWIP buffers

components/libmedian/CMakeLists.txt

@@ -0,0 +1,3 @@
+idf_component_register(SRCS "MedianFilter.c"
+                       INCLUDE_DIRS "include") 
+					   

components/libmedian/LICENSE

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2018 Alexandru Bogdan
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

components/libmedian/MedianFilter.c

@@ -0,0 +1,89 @@
+/*
+ * MedianFilter.c
+ *
+ *  Created on: May 19, 2018
+ *      Author: alexandru.bogdan
+ */
+
+#include "MedianFilter.h"
+
+int MEDIANFILTER_Init(sMedianFilter_t *medianFilter)
+{
+    if(medianFilter && medianFilter->medianBuffer &&
+        (medianFilter->numNodes % 2) && (medianFilter->numNodes > 1))
+    {
+        //initialize buffer nodes
+        for(unsigned int i = 0; i < medianFilter->numNodes; i++)
+        {
+            medianFilter->medianBuffer[i].value = 0;
+            medianFilter->medianBuffer[i].nextAge = &medianFilter->medianBuffer[(i + 1) % medianFilter->numNodes];
+            medianFilter->medianBuffer[i].nextValue = &medianFilter->medianBuffer[(i + 1) % medianFilter->numNodes];
+            medianFilter->medianBuffer[(i + 1) % medianFilter->numNodes].prevValue = &medianFilter->medianBuffer[i];
+        }
+        //initialize heads
+        medianFilter->ageHead = medianFilter->medianBuffer;
+        medianFilter->valueHead = medianFilter->medianBuffer;
+        medianFilter->medianHead = &medianFilter->medianBuffer[medianFilter->numNodes / 2];
+
+        return 0;
+    }
+
+    return -1;
+}
+
+int MEDIANFILTER_Insert(sMedianFilter_t *medianFilter, int sample)
+{
+    unsigned int i;
+    sMedianNode_t *newNode, *it;
+
+    if(medianFilter->ageHead == medianFilter->valueHead)
+    {   //if oldest node is also the smallest node, increment value head
+        medianFilter->valueHead = medianFilter->valueHead->nextValue;
+    }
+
+    if((medianFilter->ageHead == medianFilter->medianHead) ||
+        (medianFilter->ageHead->value > medianFilter->medianHead->value))
+    {   //prepare for median correction
+        medianFilter->medianHead = medianFilter->medianHead->prevValue;
+    }
+
+    //replace age head with new sample
+    newNode = medianFilter->ageHead;
+    newNode->value = sample;
+
+    //remove age head from list
+    medianFilter->ageHead->nextValue->prevValue = medianFilter->ageHead->prevValue;
+    medianFilter->ageHead->prevValue->nextValue = medianFilter->ageHead->nextValue;
+    //increment age head
+    medianFilter->ageHead = medianFilter->ageHead->nextAge;
+
+    //find new node position
+    it = medianFilter->valueHead; //set iterator as value head
+    for(i = 0; i < medianFilter->numNodes - 1; i++)
+    {
+        if(sample < it->value)
+        {
+            if(i == 0)
+            {   //replace value head if new node is the smallest
+                medianFilter->valueHead = newNode;
+            }
+            break;
+        }
+        it = it->nextValue;
+    }
+
+    //insert new node in list
+    it->prevValue->nextValue = newNode;
+    newNode->prevValue = it->prevValue;
+    it->prevValue = newNode;
+    newNode->nextValue = it;
+
+    //adjust median node
+    if(i >= (medianFilter->numNodes / 2))
+    {
+        medianFilter->medianHead = medianFilter->medianHead->nextValue;
+    }
+
+    return medianFilter->medianHead->value;
+}
+

components/libmedian/component.mk

@@ -0,0 +1,2 @@
+COMPONENT_SRCDIRS := .
+# CFLAGS +=

components/libmedian/include/MedianFilter.h

@@ -0,0 +1,39 @@
+/*
+ * MedianFilter.h
+ *
+ *  Created on: May 19, 2018
+ *      Author: alexandru.bogdan
+ */
+
+#ifndef MEDIANFILTER_H_
+#define MEDIANFILTER_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+typedef struct sMedianNode
+{
+    int value;                      //sample value
+    struct sMedianNode *nextAge;    //pointer to next oldest value
+    struct sMedianNode *nextValue;  //pointer to next smallest value
+    struct sMedianNode *prevValue;  //pointer to previous smallest value
+} sMedianNode_t;
+
+typedef struct
+{
+    unsigned int numNodes;          //median node buffer length
+    sMedianNode_t *medianBuffer;    //median node buffer
+    sMedianNode_t *ageHead;         //pointer to oldest value
+    sMedianNode_t *valueHead;       //pointer to smallest value
+    sMedianNode_t *medianHead;      //pointer to median value
+} sMedianFilter_t;
+
+int MEDIANFILTER_Init(sMedianFilter_t *medianFilter);
+int MEDIANFILTER_Insert(sMedianFilter_t *medianFilter, int sample);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif	// MEDIANFILTER_H_

components/libmedian/median_example.txt

@@ -0,0 +1,28 @@
+#include "MedianFilter.h"
+
+#include <stdlib.h>
+#include <unistd.h>
+#include <stdio.h>
+
+#define NUM_ELEMENTS    7
+
+static sMedianFilter_t medianFilter;
+static sMedianNode_t medianBuffer[NUM_ELEMENTS];
+
+int median_example(void)
+{
+    medianFilter.numNodes = NUM_ELEMENTS;
+    medianFilter.medianBuffer = medianBuffer;
+
+    MEDIANFILTER_Init(&medianFilter);
+
+    while(1)
+    {
+        int newValue = rand() % 10;
+        int medianValue = MEDIANFILTER_Insert(&medianFilter, newValue);
+        printf("New value: %d \tMedian value: %d\r\n", newValue, medianValue);
+        sleep(1);
+    }
+
+    return 0;
+}

sdkconfig

@@ -646,7 +646,7 @@ CONFIG_ESP_TIMER_IMPL_TG0_LAC=y
 # Wi-Fi
 #
 CONFIG_ESP32_WIFI_STATIC_RX_BUFFER_NUM=12
-CONFIG_ESP32_WIFI_DYNAMIC_RX_BUFFER_NUM=64
+CONFIG_ESP32_WIFI_DYNAMIC_RX_BUFFER_NUM=128
 CONFIG_ESP32_WIFI_STATIC_TX_BUFFER=y
 # CONFIG_ESP32_WIFI_DYNAMIC_TX_BUFFER is not set
 CONFIG_ESP32_WIFI_TX_BUFFER_TYPE=0
@@ -869,7 +869,7 @@ CONFIG_LWIP_TCP_HIGH_SPEED_RETRANSMISSION=y
 CONFIG_LWIP_TCP_MAXRTX=12
 CONFIG_LWIP_TCP_SYNMAXRTX=6
 CONFIG_LWIP_TCP_MSS=1440
-CONFIG_LWIP_TCP_TMR_INTERVAL=250
+CONFIG_LWIP_TCP_TMR_INTERVAL=100
 CONFIG_LWIP_TCP_MSL=60000
 CONFIG_LWIP_TCP_SND_BUF_DEFAULT=18432
 CONFIG_LWIP_TCP_WND_DEFAULT=65534

sdkconfig.old

@@ -422,12 +422,10 @@ CONFIG_SPIRAM=y
 CONFIG_SPIRAM_BOOT_INIT=y
 # CONFIG_SPIRAM_IGNORE_NOTFOUND is not set
 # CONFIG_SPIRAM_USE_MEMMAP is not set
-# CONFIG_SPIRAM_USE_CAPS_ALLOC is not set
-CONFIG_SPIRAM_USE_MALLOC=y
+CONFIG_SPIRAM_USE_CAPS_ALLOC=y
+# CONFIG_SPIRAM_USE_MALLOC is not set
 CONFIG_SPIRAM_MEMTEST=y
-CONFIG_SPIRAM_MALLOC_ALWAYSINTERNAL=16384
-# CONFIG_SPIRAM_TRY_ALLOCATE_WIFI_LWIP is not set
-CONFIG_SPIRAM_MALLOC_RESERVE_INTERNAL=32768
+CONFIG_SPIRAM_TRY_ALLOCATE_WIFI_LWIP=y
 # CONFIG_SPIRAM_ALLOW_BSS_SEG_EXTERNAL_MEMORY is not set
 CONFIG_SPIRAM_CACHE_WORKAROUND=y
 
@@ -440,7 +438,6 @@ CONFIG_SPIRAM_CACHE_WORKAROUND_STRATEGY_NOPS=y
 # end of SPIRAM cache workaround debugging
 
 # CONFIG_SPIRAM_BANKSWITCH_ENABLE is not set
-# CONFIG_SPIRAM_ALLOW_STACK_EXTERNAL_MEMORY is not set
 # CONFIG_SPIRAM_OCCUPY_HSPI_HOST is not set
 CONFIG_SPIRAM_OCCUPY_VSPI_HOST=y
 # CONFIG_SPIRAM_OCCUPY_NO_HOST is not set
@@ -649,8 +646,9 @@ CONFIG_ESP_TIMER_IMPL_TG0_LAC=y
 # Wi-Fi
 #
 CONFIG_ESP32_WIFI_STATIC_RX_BUFFER_NUM=12
-CONFIG_ESP32_WIFI_DYNAMIC_RX_BUFFER_NUM=64
+CONFIG_ESP32_WIFI_DYNAMIC_RX_BUFFER_NUM=128
 CONFIG_ESP32_WIFI_STATIC_TX_BUFFER=y
+# CONFIG_ESP32_WIFI_DYNAMIC_TX_BUFFER is not set
 CONFIG_ESP32_WIFI_TX_BUFFER_TYPE=0
 CONFIG_ESP32_WIFI_STATIC_TX_BUFFER_NUM=12
 CONFIG_ESP32_WIFI_CACHE_TX_BUFFER_NUM=32
@@ -882,6 +880,7 @@ CONFIG_LWIP_TCP_QUEUE_OOSEQ=y
 CONFIG_LWIP_TCP_OVERSIZE_MSS=y
 # CONFIG_LWIP_TCP_OVERSIZE_QUARTER_MSS is not set
 # CONFIG_LWIP_TCP_OVERSIZE_DISABLE is not set
+# CONFIG_LWIP_WND_SCALE is not set
 CONFIG_LWIP_TCP_RTO_TIME=1500
 # end of TCP
 
@@ -1280,7 +1279,7 @@ CONFIG_BTDM_CONTROLLER_BR_EDR_MAX_SYNC_CONN_EFF=0
 CONFIG_BTDM_CONTROLLER_PINNED_TO_CORE=0
 CONFIG_ADC2_DISABLE_DAC=y
 CONFIG_SPIRAM_SUPPORT=y
-# CONFIG_WIFI_LWIP_ALLOCATION_FROM_SPIRAM_FIRST is not set
+CONFIG_WIFI_LWIP_ALLOCATION_FROM_SPIRAM_FIRST=y
 CONFIG_TRACEMEM_RESERVE_DRAM=0x0
 # CONFIG_TWO_UNIVERSAL_MAC_ADDRESS is not set
 CONFIG_FOUR_UNIVERSAL_MAC_ADDRESS=y