mirror of
https://github.com/ZDoom/gzdoom.git
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296 lines
7.6 KiB
C++
296 lines
7.6 KiB
C++
#include "opn_chip_base.h"
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#include <cmath>
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#if defined(OPNMIDI_ENABLE_HQ_RESAMPLER)
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#include <zita-resampler/vresampler.h>
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#endif
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#if !defined(LIKELY) && defined(__GNUC__)
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#define LIKELY(x) __builtin_expect((x), 1)
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#elif !defined(LIKELY)
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#define LIKELY(x) (x)
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#endif
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#if !defined(UNLIKELY) && defined(__GNUC__)
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#define UNLIKELY(x) __builtin_expect((x), 0)
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#elif !defined(UNLIKELY)
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#define UNLIKELY(x) (x)
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#endif
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/* OPNChipBase */
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inline OPNChipBase::OPNChipBase() :
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m_id(0),
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m_rate(44100),
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m_clock(7670454)
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{
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}
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inline OPNChipBase::~OPNChipBase()
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{
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}
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/* OPNChipBaseT */
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template <class T>
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OPNChipBaseT<T>::OPNChipBaseT()
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: OPNChipBase(),
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m_runningAtPcmRate(false)
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#if defined(OPNMIDI_AUDIO_TICK_HANDLER)
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,
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m_audioTickHandlerInstance(NULL)
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#endif
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{
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#if defined(OPNMIDI_ENABLE_HQ_RESAMPLER)
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m_resampler = new VResampler;
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#endif
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setupResampler(m_rate);
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}
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template <class T>
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OPNChipBaseT<T>::~OPNChipBaseT()
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{
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#if defined(OPNMIDI_ENABLE_HQ_RESAMPLER)
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delete m_resampler;
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#endif
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}
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template <class T>
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bool OPNChipBaseT<T>::isRunningAtPcmRate() const
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{
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return m_runningAtPcmRate;
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}
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template <class T>
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bool OPNChipBaseT<T>::setRunningAtPcmRate(bool r)
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{
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if(r != m_runningAtPcmRate)
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{
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if(r && !static_cast<T *>(this)->canRunAtPcmRate())
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return false;
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m_runningAtPcmRate = r;
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static_cast<T *>(this)->setRate(m_rate, m_clock);
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}
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return true;
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}
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#if defined(OPNMIDI_AUDIO_TICK_HANDLER)
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template <class T>
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void OPNChipBaseT<T>::setAudioTickHandlerInstance(void *instance)
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{
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m_audioTickHandlerInstance = instance;
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}
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#endif
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template <class T>
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void OPNChipBaseT<T>::setRate(uint32_t rate, uint32_t clock)
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{
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uint32_t oldRate = m_rate;
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m_rate = rate;
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m_clock = clock;
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if(rate != oldRate)
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setupResampler(rate);
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else
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resetResampler();
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}
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template <class T>
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uint32_t OPNChipBaseT<T>::effectiveRate() const
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{
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return m_runningAtPcmRate ? m_rate : (uint32_t)nativeRate;
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}
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template <class T>
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void OPNChipBaseT<T>::reset()
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{
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resetResampler();
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}
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template <class T>
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void OPNChipBaseT<T>::generate(int16_t *output, size_t frames)
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{
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static_cast<T *>(this)->nativePreGenerate();
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for(size_t i = 0; i < frames; ++i)
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{
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int32_t frame[2];
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static_cast<T *>(this)->resampledGenerate(frame);
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for (unsigned c = 0; c < 2; ++c) {
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int32_t temp = frame[c];
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temp = (temp > -32768) ? temp : -32768;
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temp = (temp < 32767) ? temp : 32767;
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output[c] = (int16_t)temp;
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}
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output += 2;
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}
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static_cast<T *>(this)->nativePostGenerate();
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}
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template <class T>
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void OPNChipBaseT<T>::generateAndMix(int16_t *output, size_t frames)
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{
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static_cast<T *>(this)->nativePreGenerate();
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for(size_t i = 0; i < frames; ++i)
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{
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int32_t frame[2];
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static_cast<T *>(this)->resampledGenerate(frame);
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for (unsigned c = 0; c < 2; ++c) {
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int32_t temp = (int32_t)output[c] + frame[c];
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temp = (temp > -32768) ? temp : -32768;
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temp = (temp < 32767) ? temp : 32767;
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output[c] = (int16_t)temp;
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}
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output += 2;
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}
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static_cast<T *>(this)->nativePostGenerate();
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}
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template <class T>
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void OPNChipBaseT<T>::generate32(int32_t *output, size_t frames)
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{
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static_cast<T *>(this)->nativePreGenerate();
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for(size_t i = 0; i < frames; ++i)
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{
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static_cast<T *>(this)->resampledGenerate(output);
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output += 2;
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}
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static_cast<T *>(this)->nativePostGenerate();
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}
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template <class T>
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void OPNChipBaseT<T>::generateAndMix32(int32_t *output, size_t frames)
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{
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static_cast<T *>(this)->nativePreGenerate();
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for(size_t i = 0; i < frames; ++i)
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{
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int32_t frame[2];
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static_cast<T *>(this)->resampledGenerate(frame);
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output[0] += frame[0];
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output[1] += frame[1];
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output += 2;
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}
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static_cast<T *>(this)->nativePostGenerate();
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}
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template <class T>
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void OPNChipBaseT<T>::nativeTick(int16_t *frame)
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{
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#if defined(OPNMIDI_AUDIO_TICK_HANDLER)
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opn2_audioTickHandler(m_audioTickHandlerInstance, m_id, effectiveRate());
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#endif
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static_cast<T *>(this)->nativeGenerate(frame);
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}
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template <class T>
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void OPNChipBaseT<T>::setupResampler(uint32_t rate)
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{
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#if defined(OPNMIDI_ENABLE_HQ_RESAMPLER)
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m_resampler->setup(rate * (1.0 / 53267), 2, 48);
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#else
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m_oldsamples[0] = m_oldsamples[1] = 0;
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m_samples[0] = m_samples[1] = 0;
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m_samplecnt = 0;
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m_rateratio = (int32_t)(uint32_t)((((uint64_t)144 * rate) << rsm_frac) / m_clock);
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#endif
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}
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template <class T>
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void OPNChipBaseT<T>::resetResampler()
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{
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#if defined(OPNMIDI_ENABLE_HQ_RESAMPLER)
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m_resampler->reset();
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#else
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m_oldsamples[0] = m_oldsamples[1] = 0;
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m_samples[0] = m_samples[1] = 0;
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m_samplecnt = 0;
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#endif
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}
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#if defined(OPNMIDI_ENABLE_HQ_RESAMPLER)
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template <class T>
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void OPNChipBaseT<T>::resampledGenerate(int32_t *output)
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{
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if(UNLIKELY(m_runningAtPcmRate))
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{
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int16_t in[2];
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static_cast<T *>(this)->nativeTick(in);
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output[0] = (int32_t)in[0] * T::resamplerPreAmplify / T::resamplerPostAttenuate;
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output[1] = (int32_t)in[1] * T::resamplerPreAmplify / T::resamplerPostAttenuate;
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return;
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}
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VResampler *rsm = m_resampler;
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float scale = (float)T::resamplerPreAmplify /
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(float)T::resamplerPostAttenuate;
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float f_in[2];
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float f_out[2];
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rsm->inp_count = 0;
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rsm->inp_data = f_in;
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rsm->out_count = 1;
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rsm->out_data = f_out;
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while(rsm->process(), rsm->out_count != 0)
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{
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int16_t in[2];
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static_cast<T *>(this)->nativeTick(in);
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f_in[0] = scale * (float)in[0];
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f_in[1] = scale * (float)in[1];
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rsm->inp_count = 1;
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rsm->inp_data = f_in;
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rsm->out_count = 1;
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rsm->out_data = f_out;
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}
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output[0] = static_cast<int32_t>(std::lround(f_out[0]));
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output[1] = static_cast<int32_t>(std::lround(f_out[1]));
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}
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#else
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template <class T>
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void OPNChipBaseT<T>::resampledGenerate(int32_t *output)
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{
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if(UNLIKELY(m_runningAtPcmRate))
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{
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int16_t in[2];
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static_cast<T *>(this)->nativeTick(in);
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output[0] = (int32_t)in[0] * T::resamplerPreAmplify / T::resamplerPostAttenuate;
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output[1] = (int32_t)in[1] * T::resamplerPreAmplify / T::resamplerPostAttenuate;
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return;
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}
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int32_t samplecnt = m_samplecnt;
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const int32_t rateratio = m_rateratio;
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while(samplecnt >= rateratio)
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{
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m_oldsamples[0] = m_samples[0];
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m_oldsamples[1] = m_samples[1];
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int16_t buffer[2];
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static_cast<T *>(this)->nativeTick(buffer);
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m_samples[0] = buffer[0] * T::resamplerPreAmplify;
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m_samples[1] = buffer[1] * T::resamplerPreAmplify;
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samplecnt -= rateratio;
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}
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output[0] = (int32_t)(((m_oldsamples[0] * (rateratio - samplecnt)
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+ m_samples[0] * samplecnt) / rateratio)/T::resamplerPostAttenuate);
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output[1] = (int32_t)(((m_oldsamples[1] * (rateratio - samplecnt)
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+ m_samples[1] * samplecnt) / rateratio)/T::resamplerPostAttenuate);
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m_samplecnt = samplecnt + (1 << rsm_frac);
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}
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#endif
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/* OPNChipBaseBufferedT */
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template <class T, unsigned Buffer>
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void OPNChipBaseBufferedT<T, Buffer>::reset()
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{
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OPNChipBaseT<T>::reset();
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m_bufferIndex = 0;
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}
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template <class T, unsigned Buffer>
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void OPNChipBaseBufferedT<T, Buffer>::nativeGenerate(int16_t *frame)
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{
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unsigned bufferIndex = m_bufferIndex;
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if(bufferIndex == 0)
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static_cast<T *>(this)->nativeGenerateN(m_buffer, Buffer);
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frame[0] = m_buffer[2 * bufferIndex];
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frame[1] = m_buffer[2 * bufferIndex + 1];
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bufferIndex = (bufferIndex + 1 < Buffer) ? (bufferIndex + 1) : 0;
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m_bufferIndex = bufferIndex;
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}
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