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-rw-r--r--cmixer.h106
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+/*
+** 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.
+**
+** Ported to plan 9 on 13mar2021
+**/
+
+#define CM_VERSION "0.1.1"
+
+#define CLAMP(x, a, b) ((x) < (a) ? (a) : (x) > (b) ? (b) : (x))
+#define MIN(a, b) ((a) < (b) ? (a) : (b))
+#define MAX(a, b) ((a) > (b) ? (a) : (b))
+
+#define FX_BITS (12)
+#define FX_UNIT (1 << FX_BITS)
+#define FX_MASK (FX_UNIT - 1)
+#define FX_FROM_FLOAT(f) ((f) * FX_UNIT)
+#define FX_LERP(a, b, p) ((a) + ((((b) - (a)) * (p)) >> FX_BITS))
+
+#define BUFFER_SIZE (512)
+#define BUFFER_MASK (BUFFER_SIZE - 1)
+
+typedef short cm_Int16;
+typedef int cm_Int32;
+typedef vlong cm_Int64;
+typedef uchar cm_UInt8;
+typedef ushort cm_UInt16;
+typedef ulong cm_UInt32;
+
+
+typedef struct {
+ int type;
+ void *udata;
+ 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
+};
+
+typedef struct cm_Source cm_Source;
+struct cm_Source {
+ cm_Source *next; /* Next source in list */
+ cm_Int16 buffer[BUFFER_SIZE]; /* Internal buffer with raw stereo PCM */
+ cm_EventHandler handler; /* Event handler */
+ void *udata; /* Stream's udata (from cm_SourceInfo) */
+ int samplerate; /* Stream's native samplerate */
+ int length; /* Stream's length in frames */
+ int end; /* End index for the current play-through */
+ int state; /* Current state (playing|paused|stopped) */
+ cm_Int64 position; /* Current playhead position (fixed point) */
+ int lgain, rgain; /* Left and right gain (fixed point) */
+ int rate; /* Playback rate (fixed point) */
+ int nextfill; /* Next frame idx where the buffer needs to be filled */
+ int loop; /* Whether the source will loop when `end` is reached */
+ int rewind; /* Whether the source will rewind before playing */
+ int active; /* Whether the source is part of `sources` list */
+ double gain; /* Gain set by `cm_set_gain()` */
+ double pan; /* Pan set by `cm_set_pan()` */
+};
+
+
+char* cm_get_error(void);
+void cm_init(int);
+void cm_set_lock(cm_EventHandler);
+void cm_set_master_gain(double);
+void cm_process(cm_Int16*, int);
+
+cm_Source* cm_new_source(cm_SourceInfo*);
+cm_Source* cm_new_source_from_file(char *);
+cm_Source* cm_new_source_from_mem(void *, int);
+void cm_destroy_source(cm_Source *);
+double cm_get_length(cm_Source *);
+double cm_get_position(cm_Source *);
+int cm_get_state(cm_Source *);
+void cm_set_gain(cm_Source *, double);
+void cm_set_pan(cm_Source *, double);
+void cm_set_pitch(cm_Source *, double);
+void cm_set_loop(cm_Source *, int);
+void cm_play(cm_Source *);
+void cm_pause(cm_Source *);
+void cm_stop(cm_Source *);