Update dr_mp3.

extras/dr_mp3.h

 /*
 MP3 audio decoder. Choice of public domain or MIT-0. See license statements at the end of this file.
-dr_mp3 - v0.6.13 - 2020-07-06
+dr_mp3 - v0.6.14 - 2020-07-23
 
 David Reid - mackron@gmail.com
 
@@ -95,7 +95,7 @@ extern "C" {
 
 #define DRMP3_VERSION_MAJOR     0
 #define DRMP3_VERSION_MINOR     6
-#define DRMP3_VERSION_REVISION  13
+#define DRMP3_VERSION_REVISION  14
 #define DRMP3_VERSION_STRING    DRMP3_XSTRINGIFY(DRMP3_VERSION_MAJOR) "." DRMP3_XSTRINGIFY(DRMP3_VERSION_MINOR) "." DRMP3_XSTRINGIFY(DRMP3_VERSION_REVISION)
 
 #include <stddef.h> /* For size_t. */
@@ -2653,7 +2653,10 @@ static drmp3_uint32 drmp3_decode_next_frame_ex__callbacks(drmp3* pMP3, drmp3d_sa
             size_t bytesRead;
 
             /* First we need to move the data down. */
-            memmove(pMP3->pData, pMP3->pData + pMP3->dataConsumed, pMP3->dataSize);
+            if (pMP3->pData != NULL) {
+                memmove(pMP3->pData, pMP3->pData + pMP3->dataConsumed, pMP3->dataSize);
+            }
+
             pMP3->dataConsumed = 0;
 
             if (pMP3->dataCapacity < DRMP3_DATA_CHUNK_SIZE) {
@@ -4428,6 +4431,9 @@ counts rather than sample counts.
 /*
 REVISION HISTORY
 ================
+v0.6.14 - 2020-07-23
+  - Fix undefined behaviour with memmove().
+
 v0.6.13 - 2020-07-06
   - Fix a bug when converting from s16 to f32 in drmp3_read_pcm_frames_f32().
 

miniaudio.h

@@ -42957,7 +42957,7 @@ extern "C" {
 #define DRMP3_XSTRINGIFY(x)     DRMP3_STRINGIFY(x)
 #define DRMP3_VERSION_MAJOR     0
 #define DRMP3_VERSION_MINOR     6
-#define DRMP3_VERSION_REVISION  13
+#define DRMP3_VERSION_REVISION  14
 #define DRMP3_VERSION_STRING    DRMP3_XSTRINGIFY(DRMP3_VERSION_MAJOR) "." DRMP3_XSTRINGIFY(DRMP3_VERSION_MINOR) "." DRMP3_XSTRINGIFY(DRMP3_VERSION_REVISION)
 #include <stddef.h>
 #ifdef _MSC_VER
@@ -60418,7 +60418,9 @@ static drmp3_uint32 drmp3_decode_next_frame_ex__callbacks(drmp3* pMP3, drmp3d_sa
         drmp3dec_frame_info info;
         if (pMP3->dataSize < DRMP3_MIN_DATA_CHUNK_SIZE) {
             size_t bytesRead;
-            memmove(pMP3->pData, pMP3->pData + pMP3->dataConsumed, pMP3->dataSize);
+            if (pMP3->pData != NULL) {
+                memmove(pMP3->pData, pMP3->pData + pMP3->dataConsumed, pMP3->dataSize);
+            }
             pMP3->dataConsumed = 0;
             if (pMP3->dataCapacity < DRMP3_DATA_CHUNK_SIZE) {
                 drmp3_uint8* pNewData;