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Diffstat (limited to 'src/devices/sound/rf5c400.cpp')
-rw-r--r-- | src/devices/sound/rf5c400.cpp | 551 |
1 files changed, 551 insertions, 0 deletions
diff --git a/src/devices/sound/rf5c400.cpp b/src/devices/sound/rf5c400.cpp new file mode 100644 index 00000000000..2e3b823c013 --- /dev/null +++ b/src/devices/sound/rf5c400.cpp @@ -0,0 +1,551 @@ +// license:BSD-3-Clause +// copyright-holders:Ville Linde +/* + Ricoh RF5C400 emulator + + Written by Ville Linde + Improvements by the hoot development team + + history - + 2007-02-08 hoot development team + looping + stereo panning + 8-bit sample support + + 2007-02-16 hoot development team + envelope + fixed volume table +*/ + +#include "emu.h" +#include "rf5c400.h" + +static int volume_table[256]; +static double pan_table[0x64]; + +/* envelope parameter (experimental) */ +#define ENV_AR_SPEED 0.1 +#define ENV_MIN_AR 0x02 +#define ENV_MAX_AR 0x80 +#define ENV_DR_SPEED 2.0 +#define ENV_MIN_DR 0x20 +#define ENV_MAX_DR 0x73 +#define ENV_RR_SPEED 0.7 +#define ENV_MIN_RR 0x20 +#define ENV_MAX_RR 0x54 + +/* PCM type */ +enum +{ + TYPE_MASK = 0x00C0, + TYPE_16 = 0x0000, + TYPE_8LOW = 0x0040, + TYPE_8HIGH = 0x0080 +}; + +/* envelope phase */ +enum +{ + PHASE_NONE = 0, + PHASE_ATTACK, + PHASE_DECAY, + PHASE_RELEASE +}; + + +// device type definition +const device_type RF5C400 = &device_creator<rf5c400_device>; + + +//************************************************************************** +// LIVE DEVICE +//************************************************************************** + +//------------------------------------------------- +// rf5c400_device - constructor +//------------------------------------------------- + +rf5c400_device::rf5c400_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) + : device_t(mconfig, RF5C400, "RF5C400", tag, owner, clock, "rf5c400", __FILE__), + device_sound_interface(mconfig, *this), + m_rom(*this, DEVICE_SELF), + m_stream(NULL) +{ + memset(m_env_ar_table, 0, sizeof(double)*0x9f); + memset(m_env_dr_table, 0, sizeof(double)*0x9f); + memset(m_env_rr_table, 0, sizeof(double)*0x9f); +} + + + +//------------------------------------------------- +// device_start - device-specific startup +//------------------------------------------------- + +void rf5c400_device::device_start() +{ + rf5c400_init_chip(); +} + +//------------------------------------------------- +// sound_stream_update - handle a stream update +//------------------------------------------------- + +void rf5c400_device::sound_stream_update(sound_stream &stream, stream_sample_t **inputs, stream_sample_t **outputs, int samples) +{ + int i, ch; + INT16 *rom = m_rom; + UINT32 end, loop; + UINT64 pos; + UINT8 vol, lvol, rvol, type; + UINT8 env_phase; + double env_level, env_step, env_rstep; + + memset(outputs[0], 0, samples * sizeof(*outputs[0])); + memset(outputs[1], 0, samples * sizeof(*outputs[1])); + + for (ch=0; ch < 32; ch++) + { + rf5c400_channel *channel = &m_channels[ch]; + stream_sample_t *buf0 = outputs[0]; + stream_sample_t *buf1 = outputs[1]; + +// start = ((channel->startH & 0xFF00) << 8) | channel->startL; + end = ((channel->endHloopH & 0xFF) << 16) | channel->endL; + loop = ((channel->endHloopH & 0xFF00) << 8) | channel->loopL; + pos = channel->pos; + vol = channel->volume & 0xFF; + lvol = channel->pan & 0xFF; + rvol = channel->pan >> 8; + type = (channel->volume >> 8) & TYPE_MASK; + + env_phase = channel->env_phase; + env_level = channel->env_level; + env_step = channel->env_step; + env_rstep = env_step * channel->env_scale; + + for (i=0; i < samples; i++) + { + INT16 tmp; + INT32 sample; + + if (env_phase == PHASE_NONE) break; + + tmp = rom[(pos>>16) & m_rommask]; + switch ( type ) + { + case TYPE_16: + sample = tmp; + break; + case TYPE_8LOW: + sample = (INT16)(tmp << 8); + break; + case TYPE_8HIGH: + sample = (INT16)(tmp & 0xFF00); + break; + default: + sample = 0; + break; + } + + if ( sample & 0x8000 ) + { + sample ^= 0x7FFF; + } + + env_level += env_rstep; + switch (env_phase) + { + case PHASE_ATTACK: + if (env_level >= 1.0) + { + env_phase = PHASE_DECAY; + env_level = 1.0; + if (channel->decay & 0x0080) + { + env_step = 0.0; + } + else + { + env_step = + m_env_dr_table[decode80(channel->decay >> 8)]; + } + env_rstep = env_step * channel->env_scale; + } + break; + case PHASE_DECAY: + if (env_level <= 0.0) + { + env_phase = PHASE_NONE; + env_level = 0.0; + env_step = 0.0; + env_rstep = 0.0; + } + break; + case PHASE_RELEASE: + if (env_level <= 0.0) + { + env_phase = PHASE_NONE; + env_level = 0.0; + env_step = 0.0; + env_rstep = 0.0; + } + break; + } + + sample *= volume_table[vol]; + sample = (sample >> 9) * env_level; + *buf0++ += sample * pan_table[lvol]; + *buf1++ += sample * pan_table[rvol]; + + pos += channel->step; + if ( (pos>>16) > m_rom.length() || (pos>>16) > end) + { + pos -= loop<<16; + pos &= U64(0xFFFFFF0000); + } + + } + channel->pos = pos; + + channel->env_phase = env_phase; + channel->env_level = env_level; + channel->env_step = env_step; + } +} + + +/*****************************************************************************/ + +UINT8 rf5c400_device::decode80(UINT8 val) +{ + if (val & 0x80) + { + val = (val & 0x7f) + 0x1f; + } + + return val; +} + +void rf5c400_device::rf5c400_init_chip() +{ + int i; + + // init volume table + { + double max=255.0; + for (i = 0; i < 256; i++) { + volume_table[i]=(UINT16)max; + max /= pow(10.0,(double)((4.5/(256.0/16.0))/20)); + } + for(i = 0; i < 0x48; i++) { + pan_table[i] = sqrt( (double)(0x47 - i) ) / sqrt( (double)0x47 ); + } + for(i = 0x48; i < 0x64; i++) { + pan_table[i] = 0.0; + } + } + + // init envelope table + { + double r; + + // attack + r = 1.0 / (ENV_AR_SPEED * (clock() / 384)); + for (i = 0; i < ENV_MIN_AR; i++) + { + m_env_ar_table[i] = 1.0; + } + for (i = ENV_MIN_AR; i < ENV_MAX_AR; i++) + { + m_env_ar_table[i] = + r * (ENV_MAX_AR - i) / (ENV_MAX_AR - ENV_MIN_AR); + } + for (i = ENV_MAX_AR; i < 0x9f; i++) + { + m_env_ar_table[i] = 0.0; + } + + // decay + r = -5.0 / (ENV_DR_SPEED * (clock() / 384)); + for (i = 0; i < ENV_MIN_DR; i++) + { + m_env_dr_table[i] = r; + } + for (i = ENV_MIN_DR; i < ENV_MAX_DR; i++) + { + m_env_dr_table[i] = + r * (ENV_MAX_DR - i) / (ENV_MAX_DR - ENV_MIN_DR); + } + for (i = ENV_MAX_DR; i < 0x9f; i++) + { + m_env_dr_table[i] = 0.0; + } + + // release + r = -5.0 / (ENV_RR_SPEED * (clock() / 384)); + for (i = 0; i < ENV_MIN_RR; i++) + { + m_env_rr_table[i] = r; + } + for (i = ENV_MIN_RR; i < ENV_MAX_RR; i++) + { + m_env_rr_table[i] = + r * (ENV_MAX_RR - i) / (ENV_MAX_RR - ENV_MIN_RR); + } + for (i = ENV_MAX_RR; i < 0x9f; i++) + { + m_env_rr_table[i] = 0.0; + } + } + + // init channel info + for (i = 0; i < 32; i++) + { + m_channels[i].env_phase = PHASE_NONE; + m_channels[i].env_level = 0.0; + m_channels[i].env_step = 0.0; + m_channels[i].env_scale = 1.0; + } + + for (i = 0; i < ARRAY_LENGTH(m_channels); i++) + { + save_item(NAME(m_channels[i].startH), i); + save_item(NAME(m_channels[i].startL), i); + save_item(NAME(m_channels[i].freq), i); + save_item(NAME(m_channels[i].endL), i); + save_item(NAME(m_channels[i].endHloopH), i); + save_item(NAME(m_channels[i].loopL), i); + save_item(NAME(m_channels[i].pan), i); + save_item(NAME(m_channels[i].effect), i); + save_item(NAME(m_channels[i].volume), i); + save_item(NAME(m_channels[i].attack), i); + save_item(NAME(m_channels[i].decay), i); + save_item(NAME(m_channels[i].release), i); + save_item(NAME(m_channels[i].cutoff), i); + save_item(NAME(m_channels[i].pos), i); + save_item(NAME(m_channels[i].step), i); + save_item(NAME(m_channels[i].keyon), i); + save_item(NAME(m_channels[i].env_phase), i); + save_item(NAME(m_channels[i].env_level), i); + save_item(NAME(m_channels[i].env_step), i); + save_item(NAME(m_channels[i].env_scale), i); + } + + m_stream = stream_alloc(0, 2, clock()/384); + + m_rommask = m_rom.length() - 1; +} + + +/*****************************************************************************/ + +static UINT16 rf5c400_status = 0; +READ16_MEMBER( rf5c400_device::rf5c400_r ) +{ + switch(offset) + { + case 0x00: + { + return rf5c400_status; + } + + case 0x04: + { + return 0; + } + } + + return 0; +} + +WRITE16_MEMBER( rf5c400_device::rf5c400_w ) +{ + if (offset < 0x400) + { + switch(offset) + { + case 0x00: + { + rf5c400_status = data; + break; + } + + case 0x01: // channel control + { + int ch = data & 0x1f; + switch ( data & 0x60 ) + { + case 0x60: + m_channels[ch].pos = + ((m_channels[ch].startH & 0xFF00) << 8) | m_channels[ch].startL; + m_channels[ch].pos <<= 16; + + m_channels[ch].env_phase = PHASE_ATTACK; + m_channels[ch].env_level = 0.0; + m_channels[ch].env_step = + m_env_ar_table[decode80(m_channels[ch].attack >> 8)]; + break; + case 0x40: + if (m_channels[ch].env_phase != PHASE_NONE) + { + m_channels[ch].env_phase = PHASE_RELEASE; + if (m_channels[ch].release & 0x0080) + { + m_channels[ch].env_step = 0.0; + } + else + { + m_channels[ch].env_step = + m_env_rr_table[decode80(m_channels[ch].release >> 8)]; + } + } + break; + default: + m_channels[ch].env_phase = PHASE_NONE; + m_channels[ch].env_level = 0.0; + m_channels[ch].env_step = 0.0; + break; + } + break; + } + + case 0x08: // relative to env attack (channel no) + case 0x09: // relative to env attack (0x0c00/ 0x1c00) + + case 0x11: // ? counter for 0x13? + { + break; + } + case 0x13: // ? bujutsu writes sample data here + { + break; + } + + case 0x14: // ? related to 0x11/0x13 ? + break; + + case 0x21: // reverb(character).w + case 0x32: // reverb(pre-lpf).w + case 0x2B: // reverb(level).w + case 0x20: // ???.b : reverb(time).b + + case 0x2C: // chorus(level).w + case 0x30: // chorus(rate).w + case 0x22: // chorus(macro).w + case 0x23: // chorus(depth).w + case 0x24: // chorus(macro).w + case 0x2F: // chorus(depth).w + case 0x27: // chorus(send level to reverb).w + + default: + { + //osd_printf_debug("%s:rf5c400_w: %08X, %08X, %08X\n", machine().describe_context(), data, offset, mem_mask); + break; + } + } + //osd_printf_debug("%s:rf5c400_w: %08X, %08X, %08X at %08X\n", machine().describe_context(), data, offset, mem_mask); + } + else + { + // channel registers + int ch = (offset >> 5) & 0x1f; + int reg = (offset & 0x1f); + + rf5c400_channel *channel = &m_channels[ch]; + + switch (reg) + { + case 0x00: // sample start address, bits 23 - 16 + { + channel->startH = data; + break; + } + case 0x01: // sample start address, bits 15 - 0 + { + channel->startL = data; + break; + } + case 0x02: // sample playing frequency + { + channel->step = ((data & 0x1fff) << (data >> 13)) * 4; + channel->freq = data; + break; + } + case 0x03: // sample end address, bits 15 - 0 + { + channel->endL = data; + break; + } + case 0x04: // sample end address, bits 23 - 16 , sample loop 23 - 16 + { + channel->endHloopH = data; + break; + } + case 0x05: // sample loop offset, bits 15 - 0 + { + channel->loopL = data; + break; + } + case 0x06: // channel volume + { + channel->pan = data; + break; + } + case 0x07: // effect depth + { + // 0xCCRR: CC = chorus send depth, RR = reverb send depth + channel->effect = data; + break; + } + case 0x08: // volume, flag + { + channel->volume = data; + break; + } + case 0x09: // env attack + { + // 0x0100: max speed (in case of attack <= 0x40) + // 0xXX40: XX = attack-0x3f (encoded) (in case of attack > 0x40) + // + channel->attack = data; + break; + } + case 0x0A: // relative to env attack ? + { + // always 0x0100 + break; + } + case 0x0B: // relative to env decay ? + { + // always 0x0100 + break; + } + case 0x0C: // env decay + { + // 0xXX70: XX = decay (encoded) (in case of decay > 0x71) + // 0xXX80: XX = decay (encoded) (in case of decay <= 0x71) + channel->decay = data; + break; + } + case 0x0D: // relative to env release ? + { + // always 0x0100 + break; + } + case 0x0E: // env release + { + // 0xXX70: XX = release-0x1f (encoded) (0x01 if release <= 0x20) + channel->release = data; + break; + } + case 0x10: // resonance, cutoff freq. + { + // bit 15-12: resonance + // bit 11-0 : cutoff frequency + channel->cutoff = data; + break; + } + } + } +} |