ref: c05b1bd0e60840e1e4e7b7d01b2aa5b52cfcaaff
dir: /pmp_mix.c/
#include <assert.h>
#include <stdint.h>
#include <stdbool.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include "pmplay.h"
#include "pmp_main.h"
#include "snd_masm.h"
#include "tables.h"
// fast 32-bit -> 16-bit clamp
#define CLAMP16(i) if ((int16_t)(i) != i) i = 0x7FFF ^ (i >> 31)
static bool dump_Flag;
static int32_t oldReplayRate;
// globalized
int16_t chnReloc[32];
int32_t *CDA_MixBuffer = NULL;
CIType CI[32 * 2];
// ------------
static void mix_UpdateChannel(int32_t nr, WaveChannelInfoType *WCI);
void P_SetSpeed(uint16_t bpm)
{
// 8bb: added this
if (bpm == 0)
bpm = 125;
speedVal = ((realReplayRate + realReplayRate) + (realReplayRate >> 1)) / bpm; // 8bb: same as doing "((realReplayRate * 5) / 2) / bpm"
}
void P_StartTone(sampleTyp *s, int32_t smpStartPos)
{
WaveChannelInfoType WCI;
WCI.SStartPos = smpStartPos;
WCI.SBase = s->pek;
WCI.SLen = s->len;
WCI.SRepS = s->repS;
WCI.SRepL = s->repL;
WCI.SType = s->typ;
WCI.Status = Status_StartTone+Status_StopTone;
mix_UpdateChannel(PMPTmpActiveChannel, &WCI);
}
// 8bb: added these two
bool mix_Init(int32_t audioBufferSize)
{
CDA_MixBuffer = (int32_t *)malloc(audioBufferSize * (2 * sizeof (int32_t)));
if (CDA_MixBuffer == NULL)
return false;
PMPLeft = 0;
return true;
}
void mix_Free(void)
{
if (CDA_MixBuffer != NULL)
{
free(CDA_MixBuffer);
CDA_MixBuffer = NULL;
}
}
// --------------------
static void updateVolume(CIType *v, int32_t volIPLen)
{
const uint32_t vol = v->SVol * CDA_Amp;
v->SLVol1 = (vol * panningTab[256-v->SPan]) >> (32-28);
v->SRVol1 = (vol * panningTab[ v->SPan]) >> (32-28);
if (volumeRampingFlag)
{
v->SLVolIP = (v->SLVol1 - v->SLVol2) / volIPLen;
v->SRVolIP = (v->SRVol1 - v->SRVol2) / volIPLen;
v->SVolIPLen = volIPLen;
}
}
static void mix_UpdateChannel(int32_t nr, WaveChannelInfoType *WCI)
{
CIType *v = &CI[chnReloc[nr]];
const uint8_t status = WCI->Status;
if (status & Status_StopTone)
{
if (volumeRampingFlag)
{
// 8bb: fade out current voice
v->SType |= SType_Fadeout;
v->SVol = 0;
updateVolume(v, quickVolSizeVal);
// 8bb: swap current voice with neighbor
chnReloc[nr] ^= 1;
v = &CI[chnReloc[nr]];
}
v->SType = SType_Off;
}
if (status & Status_SetPan)
v->SPan = (uint8_t)WCI->SPan;
if (status & Status_SetVol)
{
uint16_t vol = WCI->SVol;
if (vol > 0) vol--; // 8bb: 0..256 -> 0..255 ( FT2 does this to prevent mul overflow in updateVolume() )
v->SVol = (uint8_t)vol;
}
if (status & (Status_SetVol+Status_SetPan))
updateVolume(v, (status & Status_QuickVol) ? quickVolSizeVal : speedVal);
if (status & Status_SetFrq)
v->SFrq = WCI->SFrq;
if (status & Status_StartTone)
{
int32_t len;
uint8_t type = WCI->SType;
const bool sample16Bit = (type >> 4) & 1;
if (type & (SType_Fwd+SType_Rev))
{
int32_t repL = WCI->SRepL;
int32_t repS = WCI->SRepS;
if (sample16Bit)
{
repL >>= 1;
repS >>= 1;
v->SRevBase = (int16_t *)WCI->SBase + (repS+repS+repL);
}
else
{
v->SRevBase = (int8_t *)WCI->SBase + (repS+repS+repL);
}
v->SRepL = repL;
v->SRepS = repS;
len = repS + repL;
}
else
{
type &= ~(SType_Fwd+SType_Rev); // 8bb: keep loop flags only
len = WCI->SLen;
if (sample16Bit)
len >>= 1;
if (len == 0)
return;
}
// 8bb: overflown 9xx (set sample offset), cut voice (voice got ended earlier in "if (status & Status_StopTone)")
if (WCI->SStartPos >= len)
return;
v->SLen = len;
v->SPos = WCI->SStartPos;
v->SPosDec = 0;
v->SBase = WCI->SBase;
v->SMixType = (sample16Bit * 4) + (volumeRampingFlag * 2) + interpolationFlag;
v->SType = type;
}
}
static void mix_UpdateChannelVolPanFrq(void)
{
WaveChannelInfoType WCI;
stmTyp *ch = stm;
for (int32_t i = 0; i < song.antChn; i++, ch++)
{
uint8_t newStatus = 0;
const uint8_t status = ch->status;
ch->status = 0;
if (status == 0)
continue;
if (status & IS_Vol)
{
WCI.SVol = ch->finalVol;
newStatus |= Status_SetVol;
}
if (status & IS_QuickVol)
newStatus |= Status_QuickVol;
if (status & IS_Pan)
{
WCI.SPan = ch->finalPan;
newStatus |= Status_SetPan;
}
if (status & IS_Period)
{
WCI.SFrq = getFrequenceValue(ch->finalPeriod);
newStatus |= Status_SetFrq;
}
WCI.Status = newStatus;
mix_UpdateChannel(i, &WCI);
}
}
void mix_ClearChannels(void) // 8bb: rewritten to handle all voices instead of song.antChn
{
lockMixer();
memset(CI, 0, sizeof (CI));
CIType *v = CI;
for (int16_t i = 0; i < 32*2; i++, v++)
{
v->SPan = 128;
v->SType = SType_Off;
}
for (int16_t i = 0; i < 32; i++)
chnReloc[i] = i+i;
unlockMixer();
}
static void mix_SaveIPVolumes(void)
{
CIType *v = CI;
for (int32_t i = 0; i < song.antChn*2; i++, v++)
{
// 8bb: this cuts any active fade-out voices (volume ramping)
if (v->SType & SType_Fadeout)
v->SType = SType_Off;
v->SLVol2 = v->SLVol1;
v->SRVol2 = v->SRVol1;
v->SVolIPLen = 0;
}
}
void mix_UpdateBuffer(int16_t *buffer, int32_t numSamples)
{
if (numSamples <= 0)
return;
if (musicPaused || WAVDump_Flag)
{
memset(buffer, 0, numSamples * (2 * sizeof (int16_t)));
return;
}
assert(CDA_MixBuffer != NULL);
memset(CDA_MixBuffer, 0, numSamples * (2 * sizeof (int32_t)));
int32_t c = 0;
int32_t a = numSamples;
while (a > 0)
{
if (PMPLeft == 0)
{
mix_SaveIPVolumes();
mainPlayer();
mix_UpdateChannelVolPanFrq();
PMPLeft = speedVal;
}
int32_t b = a;
if (b > PMPLeft)
b = PMPLeft;
// 8bb: fix for PMPMix32Proc() silent mix (vol=0)
if (b > 65535)
b = 65535;
CIType *v = CI;
for (int32_t i = 0; i < song.antChn*2; i++, v++)
PMPMix32Proc(v, b, c);
c += b;
a -= b;
PMPLeft -= b;
}
numSamples *= 2; // 8bb: stereo
/* 8bb: Done a bit differently since we don't use a
** Sound Blaster with its master volume setting.
** Instead we change the amplitude here.
*/
if (masterVol == 256) // 8bb: max master volume, no need to change amp
{
for (int32_t i = 0; i < numSamples; i++)
{
int32_t out32 = CDA_MixBuffer[i] >> 8;
CLAMP16(out32);
buffer[i] = (int16_t)out32;
}
}
else
{
for (int32_t i = 0; i < numSamples; i++)
{
int32_t out32 = CDA_MixBuffer[i] >> 8;
CLAMP16(out32);
out32 = (out32 * masterVol) >> 8;
buffer[i] = (int16_t)out32;
}
}
}
bool dump_Init(int32_t frq, int32_t amp, int16_t songPos)
{
setPos(songPos, 0);
oldReplayRate = realReplayRate;
realReplayRate = frq;
updateReplayRate();
CDA_Amp = 8 * amp;
mix_ClearChannels();
stopVoices();
song.globVol = 64;
speedVal = (frq*5 / 2) / song.speed;
quickVolSizeVal = frq / 200;
dump_Flag = false;
return true;
}
void dump_Close(void)
{
stopVoices();
realReplayRate = oldReplayRate;
updateReplayRate();
}
bool dump_EndOfTune(int32_t endSongPos)
{
bool returnValue = (dump_Flag && song.pattPos == 0 && song.timer == 1) || (song.tempo == 0);
// 8bb: FT2 bugfix for EEx (pattern delay) on first row of a pattern
if (song.pattDelTime2 > 0)
returnValue = false;
if (song.songPos == endSongPos && song.pattPos == 0 && song.timer == 1)
dump_Flag = true;
return returnValue;
}
int32_t dump_GetFrame(int16_t *p) // 8bb: returns bytes mixed
{
mix_SaveIPVolumes();
mainPlayer();
mix_UpdateChannelVolPanFrq();
memset(CDA_MixBuffer, 0, speedVal * (2 * sizeof (int32_t)));
CIType *v = CI;
for (int32_t i = 0; i < song.antChn*2; i++, v++)
PMPMix32Proc(v, speedVal, 0);
const int32_t numSamples = speedVal * 2; // 8bb: *2 for stereo
for (int32_t i = 0; i < numSamples; i++)
{
int32_t out32 = CDA_MixBuffer[i] >> 8;
CLAMP16(out32);
p[i] = (int16_t)out32;
}
return speedVal * (2 * sizeof (int16_t));
}