GB: add minigb_apu

Signed-off-by: Mahyar Koshkouei <mk@deltabeard.com>
2022-04-03 14:54:57 +01:00
parent e01980ad84
commit 108c5bf797
3 changed files with 621 additions and 0 deletions
@@ -0,0 +1,48 @@
+/**
+ * minigb_apu is released under the terms listed within the LICENSE file.
+ *
+ * minigb_apu emulates the audio processing unit (APU) of the Game Boy. This
+ * project is based on MiniGBS by Alex Baines: https://github.com/baines/MiniGBS
+ */
+
+#pragma once
+
+#include <stdint.h>
+
+#define DMG_CLOCK_FREQ		4194304.0
+#define SCREEN_REFRESH_CYCLES	70224.0
+#define VERTICAL_SYNC		(DMG_CLOCK_FREQ/SCREEN_REFRESH_CYCLES)
+
+#ifndef ENABLE_HIPASS
+# define ENABLE_HIPASS 1
+#endif
+
+#ifndef AUDIO_SAMPLE_RATE
+# define AUDIO_SAMPLE_RATE	8000.0
+#endif
+
+#ifndef AUDIO_NSAMPLES
+# define AUDIO_NSAMPLES		256
+//((unsigned)(AUDIO_SAMPLE_RATE / VERTICAL_SYNC) * 2)
+#endif
+
+/**
+ * Fill allocated buffer "data" with "len" number of 32-bit floating point
+ * samples (native endian order) in stereo interleaved format.
+ */
+void audio_callback(void *ptr, void *data, int len);
+
+/**
+ * Read audio register at given address "addr".
+ */
+uint8_t audio_read(const uint16_t addr);
+
+/**
+ * Write "val" to audio register at given address "addr".
+ */
+void audio_write(const uint16_t addr, const uint8_t val);
+
+/**
+ * Initialise audio driver.
+ */
+void audio_init(void);