Added lib/cmixer and new audio system

src/lib/cmixer/cmixer.h

@@ -0,0 +1,76 @@
+/*
+** Copyright (c) 2017 rxi
+**
+** This library is free software; you can redistribute it and/or modify it
+** under the terms of the MIT license. See `cmixer.c` for details.
+**/
+
+#ifndef CMIXER_H
+#define CMIXER_H
+
+#define CM_VERSION "0.1.0"
+
+typedef short           cm_Int16;
+typedef int             cm_Int32;
+typedef long long       cm_Int64;
+typedef unsigned char   cm_UInt8;
+typedef unsigned short  cm_UInt16;
+typedef unsigned        cm_UInt32;
+
+typedef struct cm_Source cm_Source;
+
+typedef struct {
+  int type;
+  void *udata;
+  const char *msg;
+  cm_Int16 *buffer;
+  int length;
+} cm_Event;
+
+typedef void (*cm_EventHandler)(cm_Event *e);
+
+typedef struct {
+  cm_EventHandler handler;
+  void *udata;
+  int samplerate;
+  int length;
+} cm_SourceInfo;
+
+
+enum {
+  CM_STATE_STOPPED,
+  CM_STATE_PLAYING,
+  CM_STATE_PAUSED
+};
+
+enum {
+  CM_EVENT_LOCK,
+  CM_EVENT_UNLOCK,
+  CM_EVENT_DESTROY,
+  CM_EVENT_SAMPLES,
+  CM_EVENT_REWIND
+};
+
+
+const char* cm_get_error(void);
+void cm_init(int samplerate);
+void cm_set_lock(cm_EventHandler lock);
+void cm_set_master_gain(double gain);
+void cm_process(cm_Int16 *dst, int len);
+
+cm_Source* cm_new_source(const cm_SourceInfo *info);
+cm_Source* cm_new_source_from_file(const char *filename);
+cm_Source* cm_new_source_from_mem(void *data, int size);
+void cm_destroy_source(cm_Source *src);
+double cm_get_length(cm_Source *src);
+double cm_get_position(cm_Source *src);
+int cm_get_state(cm_Source *src);
+void cm_set_gain(cm_Source *src, double gain);
+void cm_set_pan(cm_Source *src, double pan);
+void cm_set_pitch(cm_Source *src, double pitch);
+void cm_set_loop(cm_Source *src, int loop);
+void cm_play(cm_Source *src);
+void cm_pause(cm_Source *src);
+void cm_stop(cm_Source *src);
+
+#endif