Built SDL2_image and _mixer static

libsdl2_mixer/external/mpg123-1.25.6/src/waves.h

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+#ifndef MPG123_WAVES_H
+#define MPG123_WAVES_H
+/*
+	waves: some oscillators, for fun
+
+	copyright 2017 by the mpg123 project, license: LGPL 2.1
+
+	This originates from Thomas' DerMixD, but the idea is probably generic
+	enough: Construct a buffer containing a lookup table that covers some
+	periods (for fractinal relations between sampling frequency and generated
+	wave frequency).
+
+	For added fun, this not only has a single oscillator, but combines any
+	number of them (multiplicative).
+
+	Storage format is interleaved PCM samples.
+*/
+
+#include "config.h"
+#include "compat.h"
+#include "fmt123.h"
+
+struct wave_table
+{
+	void *buf; /* period buffer */
+	struct mpg123_fmt fmt;
+	size_t samples; /* samples (PCM frames) in period buffer */
+	size_t offset;  /* offset in buffer for extraction helper */
+	size_t count;   /* number of combined waves */
+	double *freq;   /* actual wave frequency list */
+};
+
+extern const char *wave_pattern_default;
+extern const char *wave_pattern_list;
+
+/* Depending on your selection of frequencies, a very large table */
+/* might be required to cover them properly. You are required to provide */
+/* a limit for the table size, prompting adjustment on the frequencies */
+/* to make things fit. The limit is not strict, it can be overstepped by */
+/* about one period of one of the configured waveforms. */
+struct wave_table* wave_table_new(
+	long rate, int channels, int encoding /* desired output format */
+,	size_t count, double *freq /* required: number and frequencies of waves */
+,	const char** pattern       /* optional: wave pattern list */
+,	double *phase /* optional: phase shift list  */
+,	size_t size_limit /* non-strict upper limit for table size */
+);
+
+/* The destructor. Returns NULL, always. */
+void* wave_table_del(struct wave_table* handle);
+
+/* Extract the desired amount of samples (PCM frames). */
+/* Returns said amount of samples, too, if successful. */
+size_t wave_table_extract( struct wave_table *handle
+,	void *dest, size_t samples );
+
+#endif