// 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 clock); void flush(); void transfer(int channel, offs_t channel_spacing, offs_t frame_spacing, offs_t total_frames, INT16 *data); void enable(UINT8 enable); void set_frequency(double frequency); void set_volume(UINT16 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 m_buffer; UINT32 m_bufin; UINT32 m_bufout; /* per-channel parameters */ INT16 m_volume; UINT8 m_enabled; double m_frequency; }; extern const device_type DMADAC; void dmadac_transfer(dmadac_sound_device **devlist, UINT8 num_channels, offs_t channel_spacing, offs_t frame_spacing, offs_t total_frames, INT16 *data); void dmadac_enable(dmadac_sound_device **devlist, UINT8 num_channels, UINT8 enable); void dmadac_set_frequency(dmadac_sound_device **devlist, UINT8 num_channels, double frequency); void dmadac_set_volume(dmadac_sound_device **devlist, UINT8 num_channels, UINT16 volume); #endif /* __DMADAC_H__ */