// license:BSD-3-Clause // copyright-holders:Aaron Giles /********************************************************************************************** * * DMA-driven DAC driver * by Aaron Giles * **********************************************************************************************/ #ifndef MAME_SOUND_DMADAC_H #define MAME_SOUND_DMADAC_H #pragma once 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, const XTAL &clock = XTAL()); void initialize_state(); void flush(); template void transfer(int channel, offs_t channel_spacing, offs_t frame_spacing, offs_t total_frames, T* data) { int j; constexpr stream_buffer::sample_t sample_scale = 1.0 / double(std::numeric_limits::max()); if (m_enabled) { int maxin = (m_bufout + BUFFER_SIZE - 1) % BUFFER_SIZE; T* src = data + channel * channel_spacing; int curin = m_bufin; /* copy the data */ for (j = 0; j < total_frames && curin != maxin; j++) { m_buffer[curin] = stream_buffer::sample_t(*src) * sample_scale; curin = (curin + 1) % BUFFER_SIZE; src += frame_spacing; } m_bufin = curin; /* log overruns */ if (j != total_frames) logerror("dmadac_transfer: buffer overrun (short %d frames)\n", total_frames - j); } } 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, std::vector const &inputs, std::vector &outputs) override; private: // internal state /* sound stream and buffers */ sound_stream * m_channel; std::vector m_buffer; uint32_t m_bufin; uint32_t m_bufout; /* per-channel parameters */ stream_buffer::sample_t m_volume; uint8_t m_enabled; static constexpr int BUFFER_SIZE = 32768; }; DECLARE_DEVICE_TYPE(DMADAC, dmadac_sound_device) 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 // MAME_SOUND_DMADAC_H