Update dr_flac, dr_wav and dr_mp3.

extras/dr_flac.h

 /*
 FLAC audio decoder. Choice of public domain or MIT-0. See license statements at the end of this file.
-dr_flac - v0.12.13 - 2020-05-16
+dr_flac - v0.12.14 - 2020-06-23
 
 David Reid - mackron@gmail.com
 
@@ -232,7 +232,7 @@ extern "C" {
 
 #define DRFLAC_VERSION_MAJOR     0
 #define DRFLAC_VERSION_MINOR     12
-#define DRFLAC_VERSION_REVISION  13
+#define DRFLAC_VERSION_REVISION  14
 #define DRFLAC_VERSION_STRING    DRFLAC_XSTRINGIFY(DRFLAC_VERSION_MAJOR) "." DRFLAC_XSTRINGIFY(DRFLAC_VERSION_MINOR) "." DRFLAC_XSTRINGIFY(DRFLAC_VERSION_REVISION)
 
 #include <stddef.h> /* For size_t. */
@@ -1316,6 +1316,8 @@ DRFLAC_API drflac_bool32 drflac_next_cuesheet_track(drflac_cuesheet_track_iterat
  ************************************************************************************************************************************************************
  ************************************************************************************************************************************************************/
 #if defined(DR_FLAC_IMPLEMENTATION) || defined(DRFLAC_IMPLEMENTATION)
+#ifndef dr_flac_c
+#define dr_flac_c
 
 /* Disable some annoying warnings. */
 #if defined(__GNUC__)
@@ -11731,12 +11733,16 @@ DRFLAC_API drflac_bool32 drflac_next_cuesheet_track(drflac_cuesheet_track_iterat
 #if defined(__GNUC__)
     #pragma GCC diagnostic pop
 #endif
+#endif  /* dr_flac_c */
 #endif  /* DR_FLAC_IMPLEMENTATION */
 
 
 /*
 REVISION HISTORY
 ================
+v0.12.14 - 2020-06-23
+  - Add include guard for the implementation section.
+
 v0.12.13 - 2020-05-16
   - Add compile-time and run-time version querying.
     - DRFLAC_VERSION_MINOR

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 - v0.6.11 - 2020-05-26
+dr_mp3 - v0.6.12 - 2020-06-23
 
 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  11
+#define DRMP3_VERSION_REVISION  12
 #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. */
@@ -523,6 +523,9 @@ DRMP3_API void drmp3_free(void* p, const drmp3_allocation_callbacks* pAllocation
  ************************************************************************************************************************************************************
  ************************************************************************************************************************************************************/
 #if defined(DR_MP3_IMPLEMENTATION) || defined(DRMP3_IMPLEMENTATION)
+#ifndef dr_mp3_c
+#define dr_mp3_c
+
 #include <stdlib.h>
 #include <string.h>
 #include <limits.h> /* For INT_MAX */
@@ -4339,6 +4342,7 @@ DRMP3_API void drmp3_free(void* p, const drmp3_allocation_callbacks* pAllocation
     }
 }
 
+#endif  /* dr_mp3_c */
 #endif  /*DR_MP3_IMPLEMENTATION*/
 
 /*
@@ -4424,6 +4428,9 @@ counts rather than sample counts.
 /*
 REVISION HISTORY
 ================
+v0.6.12 - 2020-06-23
+  - Add include guard for the implementation section.
+
 v0.6.11 - 2020-05-26
   - Fix use of uninitialized variable error.
 

extras/dr_wav.h

 /*
 WAV audio loader and writer. Choice of public domain or MIT-0. See license statements at the end of this file.
-dr_wav - v0.12.6 - TBD
+dr_wav - v0.12.6 - 2020-06-23
 
 David Reid - mackron@gmail.com
 
@@ -953,6 +953,9 @@ DRWAV_API drwav_bool32 drwav_fourcc_equal(const drwav_uint8* a, const char* b);
  ************************************************************************************************************************************************************
  ************************************************************************************************************************************************************/
 #if defined(DR_WAV_IMPLEMENTATION) || defined(DRWAV_IMPLEMENTATION)
+#ifndef dr_wav_c
+#define dr_wav_c
+
 #include <stdlib.h>
 #include <string.h> /* For memcpy(), memset() */
 #include <limits.h> /* For INT_MAX */
@@ -3960,6 +3963,7 @@ static drwav_uint64 drwav_read_pcm_frames_s16__ima(drwav* pWav, drwav_uint64 fra
                 pWav->ima.stepIndex[0] = header[2];
                 pWav->ima.predictor[1] = drwav__bytes_to_s16(header + 4);
                 pWav->ima.stepIndex[1] = header[6];
+
                 pWav->ima.cachedFrames[drwav_countof(pWav->ima.cachedFrames) - 2] = pWav->ima.predictor[0];
                 pWav->ima.cachedFrames[drwav_countof(pWav->ima.cachedFrames) - 1] = pWav->ima.predictor[1];
                 pWav->ima.cachedFrameCount = 1;
@@ -5680,6 +5684,7 @@ DRWAV_API drwav_bool32 drwav_fourcc_equal(const drwav_uint8* a, const char* b)
     return drwav__fourcc_equal(a, b);
 }
 
+#endif  /* dr_wav_c */
 #endif  /* DR_WAV_IMPLEMENTATION */
 
 /*
@@ -5870,8 +5875,10 @@ two different ways to initialize a drwav object.
 /*
 REVISION HISTORY
 ================
-v0.12.6 - TBD
+v0.12.6 - 2020-06-23
   - Change drwav_read_*() to allow NULL to be passed in as the output buffer which is equivalent to a forward seek.
+  - Fix a buffer overflow when trying to decode invalid IMA-ADPCM files.
+  - Add include guard for the implementation section.
 
 v0.12.5 - 2020-05-27
   - Minor documentation fix.