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-rw-r--r--src/devices/sound/vgm_visualizer.h89
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diff --git a/src/devices/sound/vgm_visualizer.h b/src/devices/sound/vgm_visualizer.h
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+// license:BSD-3-Clause
+// copyright-holders:Ryan Holtz
+/***************************************************************************
+
+ vgm_visualizer.h
+
+ Virtual VGM visualizer device.
+
+ Provides a waterfall view, spectrograph view, and VU view.
+
+***************************************************************************/
+
+#ifndef MAME_SOUND_VGMVIZ_H
+#define MAME_SOUND_VGMVIZ_H
+
+#pragma once
+
+#include "screen.h"
+#include "emupal.h"
+
+#include <vector>
+
+//**************************************************************************
+// GLOBAL VARIABLES
+//**************************************************************************
+
+// device type definition
+DECLARE_DEVICE_TYPE(VGMVIZ, vgmviz_device)
+
+
+
+//**************************************************************************
+// TYPE DEFINITIONS
+//**************************************************************************
+
+// ======================> vgmviz_device
+
+class vgmviz_device : public device_t, public device_mixer_interface
+{
+public:
+ // construction/destruction
+ vgmviz_device(const machine_config &mconfig, const char *tag, device_t *owner)
+ : vgmviz_device(mconfig, tag, owner, 0)
+ {
+ }
+ vgmviz_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock = 0);
+ virtual ~vgmviz_device();
+
+protected:
+ static constexpr int FFT_LENGTH = 1024;
+
+ // device-level overrides
+ virtual void device_add_mconfig(machine_config &config) override;
+ virtual void device_start() override;
+ virtual void device_reset() override;
+
+ // device_sound_interface-level overrides
+ void sound_stream_update(sound_stream &stream, stream_sample_t **inputs, stream_sample_t **outputs, int samples) override;
+
+ void init_palette(palette_device &palette) const;
+
+ uint32_t screen_update(screen_device &screen, bitmap_rgb32 &bitmap, const rectangle &cliprect);
+
+ void fill_window();
+ void apply_window(uint32_t buf_index);
+ void apply_fft();
+ void apply_waterfall();
+ void find_levels();
+
+ required_device<screen_device> m_screen;
+ required_device<palette_device> m_palette;
+
+ double m_audio_buf[2][2][FFT_LENGTH];
+ double m_fft_buf[2][FFT_LENGTH];
+ int m_current_rate;
+ int m_audio_fill_index;
+ int m_audio_frames_available;
+ int m_audio_count[2];
+ bool m_audio_available;
+
+ int m_waterfall_length;
+ int m_waterfall_buf[1024][256];
+ double m_curr_levels[2];
+ double m_curr_peaks[2];
+ double m_window[FFT_LENGTH];
+ double m_power;
+};
+
+#endif // MAME_SOUND_VGMVIZ_H