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// license:BSD-3-Clause
// copyright-holders:Aaron Giles
/**********************************************************************************************
*
* DMA-driven DAC driver
* by Aaron Giles
*
**********************************************************************************************/
#pragma once
#ifndef __DMADAC_H__
#define __DMADAC_H__
class dmadac_sound_device : public device_t,
public device_sound_interface
{
public:
dmadac_sound_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
void flush();
void transfer(int channel, offs_t channel_spacing, offs_t frame_spacing, offs_t total_frames, int16_t *data);
void enable(uint8_t enable);
void set_frequency(double frequency);
void set_volume(uint16_t volume);
protected:
// device-level overrides
virtual void device_start() override;
// sound stream update overrides
virtual void sound_stream_update(sound_stream &stream, stream_sample_t **inputs, stream_sample_t **outputs, int samples) override;
private:
// internal state
/* sound stream and buffers */
sound_stream * m_channel;
std::unique_ptr<int16_t[]> m_buffer;
uint32_t m_bufin;
uint32_t m_bufout;
/* per-channel parameters */
int16_t m_volume;
uint8_t m_enabled;
double m_frequency;
};
extern const device_type DMADAC;
void dmadac_transfer(dmadac_sound_device **devlist, uint8_t num_channels, offs_t channel_spacing, offs_t frame_spacing, offs_t total_frames, int16_t *data);
void dmadac_enable(dmadac_sound_device **devlist, uint8_t num_channels, uint8_t enable);
void dmadac_set_frequency(dmadac_sound_device **devlist, uint8_t num_channels, double frequency);
void dmadac_set_volume(dmadac_sound_device **devlist, uint8_t num_channels, uint16_t volume);
#endif /* __DMADAC_H__ */
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