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diff --git a/src/devices/sound/saa1099.h b/src/devices/sound/saa1099.h
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+// license:BSD-3-Clause
+// copyright-holders:Juergen Buchmueller, Manuel Abadia
+/**********************************************
+ Philips SAA1099 Sound driver
+**********************************************/
+
+#pragma once
+
+#ifndef __SAA1099_H__
+#define __SAA1099_H__
+
+//**************************************************************************
+// INTERFACE CONFIGURATION MACROS
+//**************************************************************************
+
+#define MCFG_SAA1099_ADD(_tag, _clock) \
+ MCFG_DEVICE_ADD(_tag, SAA1099, _clock)
+#define MCFG_SAA1099_REPLACE(_tag, _clock) \
+ MCFG_DEVICE_REPLACE(_tag, SAA1099, _clock)
+
+
+//**************************************************************************
+// TYPE DEFINITIONS
+//**************************************************************************
+
+struct saa1099_channel
+{
+ saa1099_channel() :
+ frequency(0),
+ freq_enable(0),
+ noise_enable(0),
+ octave(0),
+ counter(0.0),
+ freq(0.0),
+ level(0)
+ {
+ memset(amplitude, 0, sizeof(int)*2);
+ memset(envelope, 0, sizeof(int)*2);
+ }
+
+ int frequency; /* frequency (0x00..0xff) */
+ int freq_enable; /* frequency enable */
+ int noise_enable; /* noise enable */
+ int octave; /* octave (0x00..0x07) */
+ int amplitude[2]; /* amplitude (0x00..0x0f) */
+ int envelope[2]; /* envelope (0x00..0x0f or 0x10 == off) */
+
+ /* vars to simulate the square wave */
+ double counter;
+ double freq;
+ int level;
+};
+
+struct saa1099_noise
+{
+ saa1099_noise() :
+ counter(0.0),
+ freq(0.0),
+ level(0) {}
+
+ /* vars to simulate the noise generator output */
+ double counter;
+ double freq;
+ int level; /* noise polynomal shifter */
+};
+
+
+// ======================> saa1099_device
+
+class saa1099_device : public device_t,
+ public device_sound_interface
+{
+public:
+ saa1099_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock);
+ ~saa1099_device() { }
+
+protected:
+ // device-level overrides
+ virtual void device_start();
+
+ // sound stream update overrides
+ virtual void sound_stream_update(sound_stream &stream, stream_sample_t **inputs, stream_sample_t **outputs, int samples);
+
+public:
+ DECLARE_WRITE8_MEMBER( control_w );
+ DECLARE_WRITE8_MEMBER( data_w );
+
+private:
+ void envelope_w(int ch);
+
+private:
+ sound_stream *m_stream; /* our stream */
+ int m_noise_params[2]; /* noise generators parameters */
+ int m_env_enable[2]; /* envelope generators enable */
+ int m_env_reverse_right[2]; /* envelope reversed for right channel */
+ int m_env_mode[2]; /* envelope generators mode */
+ int m_env_bits[2]; /* non zero = 3 bits resolution */
+ int m_env_clock[2]; /* envelope clock mode (non-zero external) */
+ int m_env_step[2]; /* current envelope step */
+ int m_all_ch_enable; /* all channels enable */
+ int m_sync_state; /* sync all channels */
+ int m_selected_reg; /* selected register */
+ saa1099_channel m_channels[6]; /* channels */
+ saa1099_noise m_noise[2]; /* noise generators */
+ double m_sample_rate;
+ int m_master_clock;
+};
+
+extern const device_type SAA1099;
+
+
+#endif /* __SAA1099_H__ */