Specificy that most of the sound output code falls under

a different license.

docs/MIT_license.txt

@@ -0,0 +1,19 @@
+Copyright (c) 2019 Gameblabla
+
+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.

source/sound_output/alsa/sound_output_alsa.c

@@ -1,3 +1,9 @@
+/*
+ * Alsa output sound code.
+ * License : MIT
+ * See docs/MIT_license.txt for more information.
+*/
+
 #include <stdio.h>
 #include <stdint.h>
 #include <alsa/asoundlib.h>

source/sound_output/libao/sound_libao.c

@@ -1,3 +1,9 @@
+/*
+ * libao output sound code.
+ * License : MIT
+ * See docs/MIT_license.txt for more information.
+*/
+
 #include <stdio.h>
 #include <stdlib.h>
 #include <stdint.h>

source/sound_output/oss/sound_output_oss.c

@@ -1,3 +1,9 @@
+/*
+ * OSSv3/OSSv4 output sound code.
+ * License : MIT
+ * See docs/MIT_license.txt for more information.
+*/
+
 #include <stdio.h>
 #include <stdint.h>
 #include <sys/ioctl.h>

source/sound_output/portaudio/sound_portaudio.c

@@ -1,3 +1,9 @@
+/*
+ * Portaudio output sound code.
+ * License : MIT
+ * See docs/MIT_license.txt for more information.
+*/
+
 #include <stdio.h>
 #include <stdlib.h>
 #include <stdint.h>

source/sound_output/pulse/sound_output_pulse.c

@@ -1,3 +1,9 @@
+/*
+ * Pulseaudio output sound code.
+ * License : MIT
+ * See docs/MIT_license.txt for more information.
+*/
+
 #include <stdio.h>
 #include <stdint.h>
 #include <sys/ioctl.h>

source/sound_output/sound_output.h

@@ -1,8 +1,8 @@
 #ifndef SOUND_OUTPUT_H
 #define SOUND_OUTPUT_H
 
-void Sound_Init(void);
+extern void Sound_Init(void);
-void Sound_Update(void);
+extern void Sound_Update(void);
-void Sound_Close(void);
+extern void Sound_Close(void);
 
 #endif