mirror of
https://github.com/dborth/snes9xgx.git
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633 lines
15 KiB
C++
633 lines
15 KiB
C++
/*****************************************************************************\
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Snes9x - Portable Super Nintendo Entertainment System (TM) emulator.
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This file is licensed under the Snes9x License.
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For further information, consult the LICENSE file in the root directory.
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\*****************************************************************************/
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#include <math.h>
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#include "../snes9x.h"
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#include "apu.h"
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#include "../msu1.h"
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#include "../snapshot.h"
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#include "../display.h"
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#include "hermite_resampler.h"
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#define APU_DEFAULT_INPUT_RATE 32040
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#define APU_MINIMUM_SAMPLE_COUNT 512
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#define APU_MINIMUM_SAMPLE_BLOCK 128
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#define APU_NUMERATOR_NTSC 5632
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#define APU_DENOMINATOR_NTSC 118125
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#define APU_NUMERATOR_PAL 35527
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#define APU_DENOMINATOR_PAL 738343
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SNES_SPC *spc_core = NULL;
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static uint8 APUROM[64] =
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{
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0xCD, 0xEF, 0xBD, 0xE8, 0x00, 0xC6, 0x1D, 0xD0,
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0xFC, 0x8F, 0xAA, 0xF4, 0x8F, 0xBB, 0xF5, 0x78,
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0xCC, 0xF4, 0xD0, 0xFB, 0x2F, 0x19, 0xEB, 0xF4,
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0xD0, 0xFC, 0x7E, 0xF4, 0xD0, 0x0B, 0xE4, 0xF5,
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0xCB, 0xF4, 0xD7, 0x00, 0xFC, 0xD0, 0xF3, 0xAB,
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0x01, 0x10, 0xEF, 0x7E, 0xF4, 0x10, 0xEB, 0xBA,
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0xF6, 0xDA, 0x00, 0xBA, 0xF4, 0xC4, 0xF4, 0xDD,
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0x5D, 0xD0, 0xDB, 0x1F, 0x00, 0x00, 0xC0, 0xFF
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};
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namespace spc
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{
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static apu_callback sa_callback = NULL;
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static void *extra_data = NULL;
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static bool8 sound_in_sync = TRUE;
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static bool8 sound_enabled = FALSE;
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static int buffer_size;
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static int lag_master = 0;
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static int lag = 0;
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static uint8 *landing_buffer = NULL;
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static uint8 *shrink_buffer = NULL;
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static Resampler *resampler = NULL;
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static int32 reference_time;
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static uint32 remainder;
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static const int timing_hack_numerator = SNES_SPC::tempo_unit;
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static int timing_hack_denominator = SNES_SPC::tempo_unit;
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/* Set these to NTSC for now. Will change to PAL in S9xAPUTimingSetSpeedup
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if necessary on game load. */
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static uint32 ratio_numerator = APU_NUMERATOR_NTSC;
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static uint32 ratio_denominator = APU_DENOMINATOR_NTSC;
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static double dynamic_rate_multiplier = 1.0;
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}
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namespace msu
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{
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static int buffer_size;
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static uint8 *landing_buffer = NULL;
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static Resampler *resampler = NULL;
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static int resample_buffer_size = -1;
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static uint8 *resample_buffer = NULL;
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}
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static void EightBitize (uint8 *, int);
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static void DeStereo (uint8 *, int);
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static void ReverseStereo (uint8 *, int);
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void UpdatePlaybackRate (void);
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static void from_apu_to_state (uint8 **, void *, size_t);
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static void to_apu_from_state (uint8 **, void *, size_t);
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static void SPCSnapshotCallback (void);
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static inline int S9xAPUGetClock (int32);
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static inline int S9xAPUGetClockRemainder (int32);
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static void EightBitize (uint8 *buffer, int sample_count)
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{
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uint8 *buf8 = (uint8 *) buffer;
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int16 *buf16 = (int16 *) buffer;
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for (int i = 0; i < sample_count; i++)
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buf8[i] = (uint8) ((buf16[i] / 256) + 128);
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}
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static void DeStereo (uint8 *buffer, int sample_count)
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{
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int16 *buf = (int16 *) buffer;
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int32 s1, s2;
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for (int i = 0; i < (sample_count >> 1); i++)
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{
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s1 = (int32) buf[2 * i];
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s2 = (int32) buf[2 * i + 1];
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buf[i] = (int16) ((s1 + s2) >> 1);
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}
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}
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static void ReverseStereo (uint8 *src_buffer, int sample_count)
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{
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int16 *buffer = (int16 *) src_buffer;
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for (int i = 0; i < sample_count; i += 2)
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{
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buffer[i + 1] ^= buffer[i];
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buffer[i] ^= buffer[i + 1];
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buffer[i + 1] ^= buffer[i];
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}
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}
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bool8 S9xMixSamples (uint8 *buffer, int sample_count)
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{
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static int shrink_buffer_size = -1;
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uint8 *dest;
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if (!Settings.SixteenBitSound || !Settings.Stereo)
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{
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/* We still need both stereo samples for generating the mono sample */
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if (!Settings.Stereo)
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sample_count <<= 1;
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/* We still have to generate 16-bit samples for bit-dropping, too */
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if (shrink_buffer_size < (sample_count << 1))
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{
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delete[] spc::shrink_buffer;
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spc::shrink_buffer = new uint8[sample_count << 1];
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shrink_buffer_size = sample_count << 1;
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}
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dest = spc::shrink_buffer;
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}
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else
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dest = buffer;
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if (Settings.MSU1 && msu::resample_buffer_size < (sample_count << 3))
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{
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delete[] msu::resample_buffer;
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msu::resample_buffer = new uint8[sample_count << 3];
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msu::resample_buffer_size = sample_count << 3;
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}
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if (Settings.Mute)
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{
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memset(dest, 0, sample_count << 1);
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spc::resampler->clear();
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if(Settings.MSU1)
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msu::resampler->clear();
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return (FALSE);
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}
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else
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{
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if (spc::resampler->avail() >= (sample_count + spc::lag))
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{
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spc::resampler->read((short *) dest, sample_count);
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if (spc::lag == spc::lag_master)
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spc::lag = 0;
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if (Settings.MSU1)
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{
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if (msu::resampler->avail() >= sample_count)
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{
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msu::resampler->read((short *)msu::resample_buffer, sample_count);
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for (int32 i = 0; i < sample_count; ++i)
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*((int16*)(dest+(i * 2))) += *((int16*)(msu::resample_buffer+(i * 2)));
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}
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}
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}
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else
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{
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memset(buffer, (Settings.SixteenBitSound ? 0 : 128), (sample_count << (Settings.SixteenBitSound ? 1 : 0)) >> (Settings.Stereo ? 0 : 1));
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if (spc::lag == 0)
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spc::lag = spc::lag_master;
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return (FALSE);
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}
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}
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if (Settings.ReverseStereo && Settings.Stereo)
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ReverseStereo(dest, sample_count);
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if (!Settings.Stereo || !Settings.SixteenBitSound)
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{
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if (!Settings.Stereo)
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{
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DeStereo(dest, sample_count);
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sample_count >>= 1;
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}
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if (!Settings.SixteenBitSound)
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EightBitize(dest, sample_count);
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memcpy(buffer, dest, (sample_count << (Settings.SixteenBitSound ? 1 : 0)));
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}
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return (TRUE);
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}
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int S9xGetSampleCount (void)
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{
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return (spc::resampler->avail() >> (Settings.Stereo ? 0 : 1));
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}
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void S9xFinalizeSamples (void)
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{
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bool drop_current_msu1_samples = TRUE;
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if (!Settings.Mute)
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{
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drop_current_msu1_samples = FALSE;
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if (!spc::resampler->push((short *) spc::landing_buffer, spc_core->sample_count()))
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{
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/* We weren't able to process the entire buffer. Potential overrun. */
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spc::sound_in_sync = FALSE;
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if (Settings.SoundSync && !Settings.TurboMode)
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return;
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// since we drop the current dsp samples we also want to drop generated msu1 samples
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drop_current_msu1_samples = TRUE;
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}
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}
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// only generate msu1 if we really consumed the dsp samples (sample_count() resets at end of function),
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// otherwise we will generate multiple times for the same samples - so this needs to be after all early
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// function returns
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if (Settings.MSU1)
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{
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// generate the same number of msu1 samples as dsp samples were generated
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S9xMSU1SetOutput((int16 *)msu::landing_buffer, msu::buffer_size);
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S9xMSU1Generate(spc_core->sample_count());
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if (!drop_current_msu1_samples && !msu::resampler->push((short *)msu::landing_buffer, S9xMSU1Samples()))
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{
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// should not occur, msu buffer is larger and we drop msu samples if spc buffer overruns
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}
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}
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if (!Settings.SoundSync || Settings.TurboMode || Settings.Mute)
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spc::sound_in_sync = TRUE;
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else
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if (spc::resampler->space_empty() >= spc::resampler->space_filled())
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spc::sound_in_sync = TRUE;
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else
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spc::sound_in_sync = FALSE;
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spc_core->set_output((SNES_SPC::sample_t *) spc::landing_buffer, spc::buffer_size >> 1);
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}
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void S9xLandSamples (void)
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{
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if (spc::sa_callback != NULL)
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spc::sa_callback(spc::extra_data);
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else
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S9xFinalizeSamples();
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}
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void S9xClearSamples (void)
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{
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spc::resampler->clear();
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if (Settings.MSU1)
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msu::resampler->clear();
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spc::lag = spc::lag_master;
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}
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bool8 S9xSyncSound (void)
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{
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if (!Settings.SoundSync || spc::sound_in_sync)
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return (TRUE);
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S9xLandSamples();
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return (spc::sound_in_sync);
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}
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void S9xSetSamplesAvailableCallback (apu_callback callback, void *data)
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{
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spc::sa_callback = callback;
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spc::extra_data = data;
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}
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void S9xUpdateDynamicRate (double rate)
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{
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if(spc::dynamic_rate_multiplier != rate) {
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spc::dynamic_rate_multiplier = rate;
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UpdatePlaybackRate();
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}
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}
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void UpdatePlaybackRate (void)
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{
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if (Settings.SoundInputRate == 0)
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Settings.SoundInputRate = APU_DEFAULT_INPUT_RATE;
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double time_ratio = (double) Settings.SoundInputRate * spc::timing_hack_numerator / (Settings.SoundPlaybackRate * spc::timing_hack_denominator);
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if (Settings.DynamicRateControl)
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{
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time_ratio *= spc::dynamic_rate_multiplier;
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}
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spc::resampler->time_ratio(time_ratio);
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if (Settings.MSU1)
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{
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time_ratio = (44100.0 / Settings.SoundPlaybackRate) * (Settings.SoundInputRate / 32000.0);
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msu::resampler->time_ratio(time_ratio);
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}
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}
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bool8 S9xInitSound (int buffer_ms, int lag_ms)
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{
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// buffer_ms : buffer size given in millisecond
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// lag_ms : allowable time-lag given in millisecond
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int sample_count = buffer_ms * 32040 / 1000;
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int lag_sample_count = lag_ms * 32040 / 1000;
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spc::lag_master = lag_sample_count;
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if (Settings.Stereo)
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spc::lag_master <<= 1;
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spc::lag = spc::lag_master;
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if (sample_count < APU_MINIMUM_SAMPLE_COUNT)
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sample_count = APU_MINIMUM_SAMPLE_COUNT;
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spc::buffer_size = sample_count;
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if (Settings.Stereo)
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spc::buffer_size <<= 1;
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if (Settings.SixteenBitSound)
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spc::buffer_size <<= 1;
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msu::buffer_size = sample_count << 3; // Always 16-bit, Stereo; x2 to never overflow before dsp buffer
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printf("Sound buffer size: %d (%d samples)\n", spc::buffer_size, sample_count);
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if (spc::landing_buffer)
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delete[] spc::landing_buffer;
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spc::landing_buffer = new uint8[spc::buffer_size * 2];
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if (!spc::landing_buffer)
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return (FALSE);
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if (msu::landing_buffer)
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delete[] msu::landing_buffer;
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msu::landing_buffer = (uint8*) new uint32[msu::buffer_size / 2]; // Ensure 4-byte alignment
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if (!msu::landing_buffer)
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return (FALSE);
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/* The resampler and spc unit use samples (16-bit short) as
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arguments. Use 2x in the resampler for buffer leveling with SoundSync */
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if (!spc::resampler)
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{
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spc::resampler = new HermiteResampler(spc::buffer_size >> (Settings.SoundSync ? 0 : 1));
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if (!spc::resampler)
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{
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delete[] spc::landing_buffer;
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return (FALSE);
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}
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}
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else
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spc::resampler->resize(spc::buffer_size >> (Settings.SoundSync ? 0 : 1));
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if (!msu::resampler)
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{
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msu::resampler = new HermiteResampler(msu::buffer_size >> (Settings.SoundSync ? 0 : 1));
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if (!msu::resampler)
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{
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delete[] msu::landing_buffer;
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return (FALSE);
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}
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}
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else
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msu::resampler->resize(msu::buffer_size);
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spc_core->set_output((SNES_SPC::sample_t *) spc::landing_buffer, spc::buffer_size >> 1);
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UpdatePlaybackRate();
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spc::sound_enabled = S9xOpenSoundDevice();
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return (spc::sound_enabled);
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}
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void S9xSetSoundControl (uint8 voice_switch)
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{
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spc_core->dsp_set_stereo_switch(voice_switch << 8 | voice_switch);
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}
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void S9xSetSoundMute (bool8 mute)
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{
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Settings.Mute = mute;
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if (!spc::sound_enabled)
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Settings.Mute = TRUE;
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}
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void S9xDumpSPCSnapshot (void)
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{
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spc_core->dsp_dump_spc_snapshot();
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}
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static void SPCSnapshotCallback (void)
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{
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S9xSPCDump(S9xGetFilenameInc((".spc"), SPC_DIR));
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printf("Dumped key-on triggered spc snapshot.\n");
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}
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bool8 S9xInitAPU (void)
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{
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spc_core = new SNES_SPC;
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if (!spc_core)
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return (FALSE);
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spc_core->init();
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spc_core->init_rom(APUROM);
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spc_core->dsp_set_spc_snapshot_callback(SPCSnapshotCallback);
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spc::landing_buffer = NULL;
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spc::shrink_buffer = NULL;
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spc::resampler = NULL;
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msu::resampler = NULL;
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return (TRUE);
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}
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void S9xDeinitAPU (void)
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{
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if (spc_core)
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{
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delete spc_core;
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spc_core = NULL;
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}
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if (spc::resampler)
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{
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delete spc::resampler;
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spc::resampler = NULL;
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}
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if (spc::landing_buffer)
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{
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delete[] spc::landing_buffer;
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spc::landing_buffer = NULL;
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}
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if (spc::shrink_buffer)
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{
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delete[] spc::shrink_buffer;
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spc::shrink_buffer = NULL;
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}
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if (msu::resampler)
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{
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delete msu::resampler;
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msu::resampler = NULL;
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}
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if (msu::landing_buffer)
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{
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delete[] msu::landing_buffer;
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msu::landing_buffer = NULL;
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}
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if (msu::resample_buffer)
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{
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delete[] msu::resample_buffer;
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msu::resample_buffer = NULL;
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}
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S9xMSU1DeInit();
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}
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static inline int S9xAPUGetClock (int32 cpucycles)
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{
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return (spc::ratio_numerator * (cpucycles - spc::reference_time) + spc::remainder) /
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spc::ratio_denominator;
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}
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static inline int S9xAPUGetClockRemainder (int32 cpucycles)
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{
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return (spc::ratio_numerator * (cpucycles - spc::reference_time) + spc::remainder) %
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spc::ratio_denominator;
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}
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uint8 S9xAPUReadPort (int port)
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{
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return ((uint8) spc_core->read_port(S9xAPUGetClock(CPU.Cycles), port));
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}
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void S9xAPUWritePort (int port, uint8 byte)
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{
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spc_core->write_port(S9xAPUGetClock(CPU.Cycles), port, byte);
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}
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void S9xAPUSetReferenceTime (int32 cpucycles)
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{
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spc::reference_time = cpucycles;
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}
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void S9xAPUExecute (void)
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{
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/* Accumulate partial APU cycles */
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spc_core->end_frame(S9xAPUGetClock(CPU.Cycles));
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spc::remainder = S9xAPUGetClockRemainder(CPU.Cycles);
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S9xAPUSetReferenceTime(CPU.Cycles);
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}
|
|
|
|
void S9xAPUEndScanline (void)
|
|
{
|
|
S9xAPUExecute();
|
|
|
|
if (spc_core->sample_count() >= APU_MINIMUM_SAMPLE_BLOCK || !spc::sound_in_sync)
|
|
S9xLandSamples();
|
|
}
|
|
|
|
void S9xAPUTimingSetSpeedup (int ticks)
|
|
{
|
|
if (ticks != 0)
|
|
printf("APU speedup hack: %d\n", ticks);
|
|
|
|
spc::timing_hack_denominator = SNES_SPC::tempo_unit - ticks;
|
|
spc_core->set_tempo(spc::timing_hack_denominator);
|
|
|
|
spc::ratio_numerator = Settings.PAL ? APU_NUMERATOR_PAL : APU_NUMERATOR_NTSC;
|
|
spc::ratio_denominator = Settings.PAL ? APU_DENOMINATOR_PAL : APU_DENOMINATOR_NTSC;
|
|
spc::ratio_denominator = spc::ratio_denominator * spc::timing_hack_denominator / spc::timing_hack_numerator;
|
|
|
|
UpdatePlaybackRate();
|
|
}
|
|
|
|
void S9xAPUAllowTimeOverflow (bool allow)
|
|
{
|
|
spc_core->spc_allow_time_overflow(allow);
|
|
}
|
|
|
|
void S9xResetAPU (void)
|
|
{
|
|
spc::reference_time = 0;
|
|
spc::remainder = 0;
|
|
spc_core->reset();
|
|
spc_core->set_output((SNES_SPC::sample_t *) spc::landing_buffer, spc::buffer_size >> 1);
|
|
|
|
spc::resampler->clear();
|
|
|
|
if (Settings.MSU1)
|
|
msu::resampler->clear();
|
|
}
|
|
|
|
void S9xSoftResetAPU (void)
|
|
{
|
|
spc::reference_time = 0;
|
|
spc::remainder = 0;
|
|
spc_core->soft_reset();
|
|
spc_core->set_output((SNES_SPC::sample_t *) spc::landing_buffer, spc::buffer_size >> 1);
|
|
|
|
spc::resampler->clear();
|
|
|
|
if (Settings.MSU1)
|
|
msu::resampler->clear();
|
|
}
|
|
|
|
static void from_apu_to_state (uint8 **buf, void *var, size_t size)
|
|
{
|
|
memcpy(*buf, var, size);
|
|
*buf += size;
|
|
}
|
|
|
|
static void to_apu_from_state (uint8 **buf, void *var, size_t size)
|
|
{
|
|
memcpy(var, *buf, size);
|
|
*buf += size;
|
|
}
|
|
|
|
void S9xAPUSaveState (uint8 *block)
|
|
{
|
|
uint8 *ptr = block;
|
|
|
|
spc_core->copy_state(&ptr, from_apu_to_state);
|
|
|
|
SET_LE32(ptr, spc::reference_time);
|
|
ptr += sizeof(int32);
|
|
SET_LE32(ptr, spc::remainder);
|
|
}
|
|
|
|
void S9xAPULoadState (uint8 *block)
|
|
{
|
|
uint8 *ptr = block;
|
|
|
|
S9xResetAPU();
|
|
|
|
spc_core->copy_state(&ptr, to_apu_from_state);
|
|
|
|
spc::reference_time = GET_LE32(ptr);
|
|
ptr += sizeof(int32);
|
|
spc::remainder = GET_LE32(ptr);
|
|
}
|
|
|
|
bool8 S9xSPCDump (const char *filename)
|
|
{
|
|
FILE *fs;
|
|
uint8 buf[SNES_SPC::spc_file_size];
|
|
size_t ignore;
|
|
|
|
fs = fopen(filename, "wb");
|
|
if (!fs)
|
|
return (FALSE);
|
|
|
|
S9xSetSoundMute(TRUE);
|
|
|
|
spc_core->init_header(buf);
|
|
spc_core->save_spc(buf);
|
|
|
|
ignore = fwrite(buf, SNES_SPC::spc_file_size, 1, fs);
|
|
|
|
fclose(fs);
|
|
|
|
S9xSetSoundMute(FALSE);
|
|
|
|
return (TRUE);
|
|
}
|