guard before m_mutex

Author: schreibfaul1

src/Audio.cpp

@@ -4,8 +4,8 @@
 
     Created on: 28.10.2018                                                                                                  */
 char audioI2SVers[] = "\
-    Version 3.4.3zc                                                                                                                              ";
-/*  Updated on: 26.11.2025
+    Version 3.4.3zd                                                                                                                              ";
+/*  Updated on: 27.11.2025
 
     Author: Wolle (schreibfaul1)
     Audio library for ESP32, ESP32-S3 or ESP32-P4
@@ -104,6 +104,7 @@ size_t AudioBuffer::getMaxBlockSize() {
 }
 //----------------------------------------------------------------------------------------------------------------------------------------------------
 size_t AudioBuffer::freeSpace() {
+    if(!m_init) return 0;
     if (m_readPtr == m_writePtr) {
         if (m_isEmpty) { return m_mainBuffSize; }
         if (m_isFull) { return 0; }
@@ -120,10 +121,7 @@ size_t AudioBuffer::freeSpace() {
 }
 //----------------------------------------------------------------------------------------------------------------------------------------------------
 size_t AudioBuffer::bufferFilled() {
-    if (m_mutex == NULL) {
-        log_e("bufferFilled(): m_mutex is NULL!");
-        return 0;
-    }
+    if(!m_init) return 0;
     xSemaphoreTake(m_mutex, portMAX_DELAY);
     size_t bufferFilled = 0;
     if (m_readPtr == m_writePtr) {
@@ -148,6 +146,7 @@ size_t AudioBuffer::bufferFilled() {
 }
 //----------------------------------------------------------------------------------------------------------------------------------------------------
 size_t AudioBuffer::writeSpace() {
+    if(!m_init) return 0;
     xSemaphoreTake(m_mutex, portMAX_DELAY);
     m_writeSpace = 0;
 
@@ -194,6 +193,7 @@ size_t AudioBuffer::writeSpace() {
 }
 //----------------------------------------------------------------------------------------------------------------------------------------------------
 void AudioBuffer::bytesWritten(size_t bw) {
+    if(!m_init) return;
     xSemaphoreTake(m_mutex, portMAX_DELAY);
     if (!bw) goto end;
 
@@ -222,6 +222,7 @@ void AudioBuffer::bytesWritten(size_t bw) {
 }
 //----------------------------------------------------------------------------------------------------------------------------------------------------
 size_t AudioBuffer::readSpace() {
+    if(!m_init) return 0;
     xSemaphoreTake(m_mutex, portMAX_DELAY);
 
     if (m_readPtr >= m_endPtr && m_writePtr <= m_endPtr) {
@@ -257,6 +258,7 @@ size_t AudioBuffer::readSpace() {
 }
 //----------------------------------------------------------------------------------------------------------------------------------------------------
 void AudioBuffer::bytesWasRead(size_t br) {
+    if(!m_init) return;
     xSemaphoreTake(m_mutex, portMAX_DELAY);
 
     if (!br) goto end;