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Diffstat (limited to 'src/emu/resampler.h')
-rw-r--r-- | src/emu/resampler.h | 66 |
1 files changed, 66 insertions, 0 deletions
diff --git a/src/emu/resampler.h b/src/emu/resampler.h new file mode 100644 index 00000000000..d0758b5ae7e --- /dev/null +++ b/src/emu/resampler.h @@ -0,0 +1,66 @@ +// license:BSD-3-Clause +// copyright-holders:Olivier Galibert + +// Audio resampler + +#pragma once + +#ifndef MAME_EMU_RESAMPLER_H +#define MAME_EMU_RESAMPLER_H + +#include "sound.h" + +class audio_resampler +{ +public: + using sample_t = sound_stream::sample_t; + + virtual ~audio_resampler() = default; + + virtual u32 history_size() const = 0; + + virtual void apply(const emu::detail::output_buffer_flat<sample_t> &src, std::vector<sample_t> &dest, u64 dest_sample, u32 srcc, float gain, u32 samples) const = 0; + virtual void apply(const emu::detail::output_buffer_interleaved<s16> &src, std::vector<sample_t> &dest, u64 dest_sample, u32 srcc, float gain, u32 samples) const = 0; + virtual void apply(const emu::detail::output_buffer_flat<sample_t> &src, std::vector<s16> &dest, u32 destc, int dchannels, u64 dest_sample, u32 srcc, float gain, u32 samples) const = 0; +}; + +class audio_resampler_hq : public audio_resampler +{ +public: + audio_resampler_hq(u32 fs, u32 ft, float latency, u32 max_order_per_lane, u32 max_lanes); + virtual ~audio_resampler_hq() = default; + + virtual u32 history_size() const override; + + virtual void apply(const emu::detail::output_buffer_flat<sample_t> &src, std::vector<sample_t> &dest, u64 dest_sample, u32 srcc, float gain, u32 samples) const override; + virtual void apply(const emu::detail::output_buffer_interleaved<s16> &src, std::vector<sample_t> &dest, u64 dest_sample, u32 srcc, float gain, u32 samples) const override; + virtual void apply(const emu::detail::output_buffer_flat<sample_t> &src, std::vector<s16> &dest, u32 destc, int dchannels, u64 dest_sample, u32 srcc, float gain, u32 samples) const override; + +private: + u32 m_order_per_lane, m_ftm, m_fsm, m_ft, m_fs, m_delta, m_skip, m_phases, m_phase_shift; + + std::vector<std::vector<float>> m_coefficients; + + static u32 compute_gcd(u32 fs, u32 ft); +}; + +class audio_resampler_lofi : public audio_resampler +{ +public: + audio_resampler_lofi(u32 fs, u32 ft); + virtual ~audio_resampler_lofi() = default; + + virtual u32 history_size() const override; + + virtual void apply(const emu::detail::output_buffer_flat<sample_t> &src, std::vector<sample_t> &dest, u64 dest_sample, u32 srcc, float gain, u32 samples) const override; + virtual void apply(const emu::detail::output_buffer_interleaved<s16> &src, std::vector<sample_t> &dest, u64 dest_sample, u32 srcc, float gain, u32 samples) const override; + virtual void apply(const emu::detail::output_buffer_flat<sample_t> &src, std::vector<s16> &dest, u32 destc, int dchannels, u64 dest_sample, u32 srcc, float gain, u32 samples) const override; + +private: + static const std::array<std::array<float, 0x1001>, 2> interpolation_table; + u32 m_source_divide, m_fs, m_ft; + u32 m_step; +}; + +#endif + |