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#include "ppz8.h"
#include "fmdriver_common.h"
#include <stdio.h>
void ppz8_init(struct ppz8 *ppz8, uint16_t srate, uint16_t mix_volume) {
for (int i = 0; i < 2; i++) {
struct ppz8_pcmbuf *buf = &ppz8->buf[i];
buf->data = 0;
buf->buflen = 0;
for (int j = 0; j < 128; j++) {
struct ppz8_pcmvoice *voice = &buf->voice[j];
voice->start = 0;
voice->len = 0;
voice->loopstart = 0;
voice->loopend = 0;
voice->origfreq = 0;
}
}
for (int i = 0; i < 8; i++) {
struct ppz8_channel *channel = &ppz8->channel[i];
channel->ptr = -1;
channel->loopstartptr = -1;
channel->loopendptr = -1;
channel->endptr = 0;
channel->freq = 0;
channel->loopstartoff = -1;
channel->loopendoff = -1;
channel->prevout[0] = 0;
channel->prevout[1] = 0;
channel->vol = 8;
channel->pan = 5;
channel->voice = 0;
}
ppz8->srate = srate;
ppz8->totalvol = 12;
ppz8->mix_volume = mix_volume;
}
static uint64_t ppz8_loop(const struct ppz8_channel *channel, uint64_t ptr) {
if (channel->loopstartptr != (uint64_t)-1) {
if (channel->loopendptr != (uint64_t)-1) {
if (ptr >= channel->loopendptr) {
if (channel->loopendptr == channel->loopstartptr) return (uint64_t)-1;
uint32_t offset = (ptr - channel->loopendptr) >> 16;
offset %= (uint32_t)((channel->loopendptr - channel->loopstartptr) >> 16);
offset += (uint32_t)(channel->loopstartptr >> 16);
return (ptr & ((1<<16)-1)) | (((uint64_t)offset) << 16);
}
} else if (ptr >= channel->endptr) {
if (channel->endptr == channel->loopstartptr) return (uint64_t)-1;
uint32_t offset = (ptr - channel->endptr) >> 16;
offset %= (uint32_t)((channel->endptr - channel->loopstartptr) >> 16);
offset += (uint32_t)(channel->loopstartptr >> 16);
return (ptr & ((1<<16)-1)) | (((uint64_t)offset) << 16);
}
}
if (ptr >= channel->endptr) {
return (uint64_t)-1;
}
return ptr;
}
static int32_t ppz8_channel_calc(struct ppz8 *ppz8, struct ppz8_channel *channel) {
struct ppz8_pcmbuf *buf = &ppz8->buf[channel->voice>>7];
struct ppz8_pcmvoice *voice = &buf->voice[channel->voice & 0x7f];
int32_t out = 0;
if (channel->vol) {
uint16_t coeff = channel->ptr & 0xffffu;
out += (int32_t)channel->prevout[0] * (0x10000u - coeff);
out += (int32_t)channel->prevout[1] * coeff;
out >>= 16;
// volume: out * 2**((volume-15)/2)
out >>= (7 - ((channel->vol&0xf)>>1));
if (!(channel->vol&1)) {
out *= 0xb505;
out >>= 16;
}
}
uint64_t ptrdiff = (((uint64_t)channel->freq * voice->origfreq) << 1) / ppz8->srate;
uint64_t oldptr = channel->ptr;
channel->ptr += ptrdiff;
uint32_t bufdiff = (channel->ptr>>16) - (oldptr>>16);
if (bufdiff) {
if (/*bufdiff == 1*/0) {
channel->prevout[0] = channel->prevout[1];
channel->prevout[1] = 0;
channel->ptr = ppz8_loop(channel, channel->ptr);
if (channel->ptr != (uint64_t)-1) {
uint32_t bufptr = channel->ptr >> 16;
if (buf->data && bufptr < buf->buflen) {
channel->prevout[1] = buf->data[bufptr];
}
} else {
channel->playing = false;
}
} else {
channel->prevout[0] = 0;
channel->prevout[1] = 0;
uint64_t ptr1 = ppz8_loop(channel, channel->ptr - 0x10000);
if (ptr1 != (uint64_t)-1) {
uint32_t bufptr = ptr1 >> 16;
if (buf->data && bufptr < buf->buflen) {
channel->prevout[0] = buf->data[bufptr];
}
channel->ptr = ppz8_loop(channel, channel->ptr);
if (channel->ptr != (uint64_t)-1) {
bufptr = channel->ptr >> 16;
if (buf->data && bufptr < buf->buflen) {
channel->prevout[1] = buf->data[bufptr];
}
} else {
channel->playing = false;
}
} else {
channel->playing = false;
}
}
}
return out;
}
void ppz8_mix(struct ppz8 *ppz8, int16_t *buf, unsigned samples) {
static const uint8_t pan_vol[10][2] = {
{0, 0},
{4, 0},
{4, 1},
{4, 2},
{4, 3},
{4, 4},
{3, 4},
{2, 4},
{1, 4},
{0, 4}
};
for (unsigned i = 0; i < samples; i++) {
int32_t lo = buf[i*2+0];
int32_t ro = buf[i*2+1];
for (int p = 0; p < 8; p++) {
//if (p < 3) continue;
//if (p >= 6) continue;
struct ppz8_channel *channel = &ppz8->channel[p];
if (!channel->playing) continue;
int32_t out = ppz8_channel_calc(ppz8, channel);
out *= ppz8->mix_volume;
out >>= 15;
lo += (out * pan_vol[channel->pan][0]) >> 2;
ro += (out * pan_vol[channel->pan][1]) >> 2;
}
if (lo < INT16_MIN) lo = INT16_MIN;
if (lo > INT16_MAX) lo = INT16_MAX;
if (ro < INT16_MIN) ro = INT16_MIN;
if (ro > INT16_MAX) ro = INT16_MAX;
buf[i*2+0] = lo;
buf[i*2+1] = ro;
}
}
static int16_t calc_acc(int16_t acc, uint16_t adpcmd, uint8_t data) {
data &= 0xf;
int32_t acc_d = (((data&7)<<1)|1);
if (data&8) acc_d = -acc_d;
int32_t newacc = acc + (acc_d*adpcmd/8);
if (newacc < -32768) newacc = -32768;
if (newacc > 32767) newacc = 32767;
return newacc;
}
static uint16_t calc_adpcmd(uint16_t adpcmd, uint8_t data) {
static const uint8_t adpcm_table[8] = {
57, 57, 57, 57, 77, 102, 128, 153,
};
uint32_t newadpcmd = adpcmd*adpcm_table[data&7]/64;
if (newadpcmd < 127) newadpcmd = 127;
if (newadpcmd > 24576) newadpcmd = 24576;
return newadpcmd;
}
bool ppz8_pvi_load(struct ppz8 *ppz8, uint8_t bnum,
const uint8_t *pvidata, uint32_t pvidatalen,
int16_t *decodebuf) {
if (bnum >= 2) return false;
//if (pvidatalen > (0x210+(1<<18))) return false;
struct ppz8_pcmbuf *buf = &ppz8->buf[bnum];
//uint16_t origfreq = ((uint32_t)read16le(&pvidata[0x8]) * 55467) >> 16;
uint16_t origfreq = (0x49ba*55467)>>16;
uint32_t lastaddr = 0;
for (int i = 0; i < 0x80; i++) {
uint32_t startaddr = read16le(&pvidata[0x10+i*4+0]) << 6;
uint32_t endaddr = (read16le(&pvidata[0x10+i*4+2])+1) << 6;
if (startaddr != lastaddr) break;
if (startaddr >= endaddr) break;
struct ppz8_pcmvoice *voice = &buf->voice[i];
voice->start = startaddr<<1;
voice->len = (endaddr-startaddr)<<1;
voice->loopstart = (uint32_t)-1;
voice->loopend = (uint32_t)-1;
voice->origfreq = origfreq;
int16_t acc = 0;
uint16_t adpcmd = 127;
for (uint32_t a = startaddr; a < endaddr; a++) {
if (pvidatalen <= (0x210+(a>>1))) return false;
uint8_t data = pvidata[0x210+(a>>1)];
if (a&1) {
data &= 0xf;
} else {
data >>= 4;
}
acc = calc_acc(acc, adpcmd, data);
adpcmd = calc_adpcmd(adpcmd, data);
decodebuf[a] = acc;
}
lastaddr = endaddr;
}
buf->data = decodebuf;
buf->buflen = ppz8_pvi_decodebuf_samples(pvidatalen);
return true;
}
static void ppz8_channel_play(struct ppz8 *ppz8, uint8_t ch, uint8_t v) {
if (ch >= 8) return;
struct ppz8_channel *channel = &ppz8->channel[ch];
channel->voice = v;
struct ppz8_pcmbuf *buf = &ppz8->buf[channel->voice>>7];
struct ppz8_pcmvoice *voice = &buf->voice[channel->voice & 0x7f];
channel->ptr = ((uint64_t)(voice->start)>>1)<<16;
channel->endptr = ((uint64_t)(voice->start+voice->len)>>1)<<16;
/*
channel->loopstartptr = ((uint64_t)(voice->loopstart)>>1)<<16;
channel->loopendptr = ((uint64_t)(voice->loopend)>>1)<<16;
*/
channel->loopstartptr = (channel->loopstartoff == (uint32_t)-1) ? (uint64_t)-1
: channel->ptr + (((uint64_t)(channel->loopstartoff))<<16);
channel->loopendptr = (channel->loopendoff == (uint32_t)-1) ? (uint64_t)-1
: channel->ptr + (((uint64_t)(channel->loopendoff))<<16);
channel->prevout[0] = 0;
channel->prevout[1] = 0;
channel->playing = true;
uint32_t bufptr = channel->ptr >> 16;
if (buf->data && bufptr < buf->buflen) {
channel->prevout[1] = buf->data[bufptr];
}
}
static void ppz8_channel_stop(struct ppz8 *ppz8, uint8_t ch) {
if (ch >= 8) return;
struct ppz8_channel *channel = &ppz8->channel[ch];
channel->playing = false;
channel->ptr = -1;
}
static void ppz8_channel_volume(struct ppz8 *ppz8, uint8_t ch, uint8_t vol) {
if (ch >= 8) return;
if (vol >= 16) return;
struct ppz8_channel *channel = &ppz8->channel[ch];
channel->vol = vol;
}
static void ppz8_channel_freq(struct ppz8 *ppz8, uint8_t ch, uint32_t freq) {
if (ch >= 8) return;
struct ppz8_channel *channel = &ppz8->channel[ch];
channel->freq = freq;
}
static void ppz8_channel_loopoffset(struct ppz8 *ppz8, uint8_t ch,
uint32_t startoff, uint32_t endoff) {
if (ch >= 8) return;
struct ppz8_channel *channel = &ppz8->channel[ch];
channel->loopstartoff = startoff;
channel->loopendoff = endoff;
fprintf(stderr, "channel: %d, start: %08x, end: %08x\n", ch, startoff, endoff);
}
static void ppz8_channel_pan(struct ppz8 *ppz8, uint8_t ch, uint8_t pan) {
if (ch >= 8) return;
if (pan >= 10) return;
struct ppz8_channel *channel = &ppz8->channel[ch];
channel->pan = pan;
}
static void ppz8_total_volume(struct ppz8 *ppz8, uint8_t vol) {
if (vol >= 16) return;
ppz8->totalvol = vol;
}
const struct ppz8_functbl ppz8_functbl = {
ppz8_channel_play,
ppz8_channel_stop,
ppz8_channel_volume,
ppz8_channel_freq,
ppz8_channel_loopoffset,
ppz8_channel_pan,
ppz8_total_volume
};
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