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FACT_internal.c
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FACT_internal.c
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/* FACT - XACT Reimplementation for FNA
* Copyright 2009-2018 Ethan Lee and the MonoGame Team
*
* Released under the Microsoft Public License.
* See LICENSE for details.
*/
#include "FACT_internal.h"
/* Various internal math functions */
FACTRPC* FACT_INTERNAL_GetRPC(
FACTAudioEngine *engine,
uint32_t code
) {
uint16_t i;
for (i = 0; i < engine->rpcCount; i += 1)
{
if (engine->rpcCodes[i] == code)
{
return &engine->rpcs[i];
}
}
FAudio_assert(0 && "RPC code not found!");
return NULL;
}
float FACT_INTERNAL_CalculateRPC(
FACTRPC *rpc,
float var
) {
float result;
uint8_t i;
/* Min/Max */
if (var <= rpc->points[0].x)
{
/* Zero to first defined point */
return rpc->points[0].y;
}
if (var >= rpc->points[rpc->pointCount - 1].x)
{
/* Last defined point to infinity */
return rpc->points[rpc->pointCount - 1].y;
}
/* Something between points... TODO: Non-linear curves */
result = 0.0f;
for (i = 0; i < rpc->pointCount - 1; i += 1)
{
/* y = b */
result = rpc->points[i].y;
if (var >= rpc->points[i].x && var <= rpc->points[i + 1].x)
{
/* y += mx */
result +=
((rpc->points[i + 1].y - rpc->points[i].y) /
(rpc->points[i + 1].x - rpc->points[i].x)) *
(var - rpc->points[i].x);
/* Pre-algebra, rockin'! */
break;
}
}
return result;
}
void FACT_INTERNAL_UpdateRPCs(
FACTCue *cue,
uint8_t codeCount,
uint32_t *codes,
FACTInstanceRPCData *data
) {
uint8_t i;
FACTRPC *rpc;
float rpcResult;
FACTAudioEngine *engine = cue->parentBank->parentEngine;
if (codeCount > 0)
{
data->rpcVolume = 0.0f;
data->rpcPitch = 0.0f;
data->rpcFilterFreq = 0.0f; /* FIXME: Starting value? */
for (i = 0; i < codeCount; i += 1)
{
rpc = FACT_INTERNAL_GetRPC(
engine,
codes[i]
);
if (engine->variables[rpc->variable].accessibility & 0x04)
{
if (FAudio_strcmp(
engine->variableNames[rpc->variable],
"AttackTime"
) == 0) {
/* TODO: AttackTime */
rpcResult = 0.0f;
}
else if (FAudio_strcmp(
engine->variableNames[rpc->variable],
"ReleaseTime"
) == 0) {
/* TODO: ReleaseTime */
rpcResult = 0.0f;
}
else
{
rpcResult = FACT_INTERNAL_CalculateRPC(
rpc,
cue->variableValues[rpc->variable]
);
}
}
else
{
rpcResult = FACT_INTERNAL_CalculateRPC(
rpc,
engine->globalVariableValues[rpc->variable]
);
}
if (rpc->parameter == RPC_PARAMETER_VOLUME)
{
data->rpcVolume += rpcResult;
}
else if (rpc->parameter == RPC_PARAMETER_PITCH)
{
data->rpcPitch += rpcResult;
}
else if (rpc->parameter == RPC_PARAMETER_FILTERFREQUENCY)
{
data->rpcFilterFreq += rpcResult;
}
else
{
FAudio_assert(0 && "Unhandled RPC parameter type!");
}
}
}
}
void FACT_INTERNAL_SetDSPParameter(
FACTDSPPreset *dsp,
FACTRPC *rpc,
float var
) {
uint16_t par = rpc->parameter - RPC_PARAMETER_COUNT;
dsp->parameters[par].value = FAudio_clamp(
FACT_INTERNAL_CalculateRPC(rpc, var),
dsp->parameters[par].minVal,
dsp->parameters[par].maxVal
);
}
float FACT_INTERNAL_CalculateAmplitudeRatio(float decibel)
{
return FAudio_pow(10.0, decibel / 2000.0);
}
void FACT_INTERNAL_SelectSound(FACTCue *cue)
{
uint16_t i, j;
float max, next, weight;
const char *wbName;
FACTWaveBank *wb;
if (cue->data->flags & 0x04)
{
/* Sound */
cue->playing.sound.sound = cue->sound.sound;
cue->active = 0x02;
}
else
{
/* Variation */
if (cue->sound.variation->flags == 3)
{
/* Interactive */
if (cue->parentBank->parentEngine->variables[cue->sound.variation->variable].accessibility & 0x04)
{
FACTCue_GetVariable(
cue,
cue->sound.variation->variable,
&next
);
}
else
{
FACTAudioEngine_GetGlobalVariable(
cue->parentBank->parentEngine,
cue->sound.variation->variable,
&next
);
}
for (i = 0; i < cue->sound.variation->entryCount; i += 1)
{
if ( next <= cue->sound.variation->entries[i].maxWeight &&
next >= cue->sound.variation->entries[i].minWeight )
{
break;
}
}
/* This should only happen when the user control
* variable is none of the sound probabilities, in
* which case we are just silent. But, we should still
* claim to be "playing" in the meantime.
*/
if (i == cue->sound.variation->entryCount)
{
cue->active = 0x00;
return;
}
}
else
{
/* Random */
max = 0.0f;
for (i = 0; i < cue->sound.variation->entryCount; i += 1)
{
max += (
cue->sound.variation->entries[i].maxWeight -
cue->sound.variation->entries[i].minWeight
);
}
next = FAudio_rng() * max;
/* Use > 0, not >= 0. If we hit 0, that's it! */
for (i = cue->sound.variation->entryCount - 1; i > 0; i -= 1)
{
weight = (
cue->sound.variation->entries[i].maxWeight -
cue->sound.variation->entries[i].minWeight
);
if (next > (max - weight))
{
break;
}
max -= weight;
}
}
if (cue->sound.variation->isComplex)
{
/* Grab the Sound via the code. FIXME: Do this at load time? */
for (j = 0; j < cue->parentBank->soundCount; j += 1)
{
if (cue->sound.variation->entries[i].soundCode == cue->parentBank->soundCodes[j])
{
cue->playing.sound.sound = &cue->parentBank->sounds[j];
break;
}
}
cue->active = 0x02;
}
else
{
/* Pull in the WaveBank... */
wbName = cue->parentBank->wavebankNames[
cue->sound.variation->entries[i].simple.wavebank
];
wb = cue->parentBank->parentEngine->wbList;
while (wb != NULL)
{
if (FAudio_strcmp(wbName, wb->name) == 0)
{
break;
}
wb = wb->next;
}
FAudio_assert(wb != NULL);
/* Generate the wave... */
FACTWaveBank_Prepare(
wb,
cue->sound.variation->entries[i].simple.track,
0,
0,
0,
&cue->playing.wave
);
cue->active = 0x01;
}
}
/* Alloc SoundInstance variables */
if (cue->active & 0x02)
{
cue->playing.sound.tracks = (FACTTrackInstance*) FAudio_malloc(
sizeof(FACTTrackInstance) * cue->playing.sound.sound->trackCount
);
for (i = 0; i < cue->playing.sound.sound->trackCount; i += 1)
{
cue->playing.sound.tracks[i].events = (FACTEventInstance*) FAudio_malloc(
sizeof(FACTEventInstance) * cue->playing.sound.sound->tracks[i].eventCount
);
for (j = 0; j < cue->playing.sound.sound->tracks[i].eventCount; j += 1)
{
cue->playing.sound.tracks[i].events[j].timestamp =
cue->playing.sound.sound->tracks[i].events[j].timestamp;
cue->playing.sound.tracks[i].events[j].loopCount =
cue->playing.sound.sound->tracks[i].events[j].loopCount;
cue->playing.sound.tracks[i].events[j].finished = 0;
FAudio_zero(
&cue->playing.sound.tracks[i].events[j].data,
sizeof(cue->playing.sound.tracks[i].events[j].data)
);
}
cue->playing.sound.tracks[i].rpcData.rpcVolume = 1.0f;
cue->playing.sound.tracks[i].rpcData.rpcPitch = 0.0f;
cue->playing.sound.tracks[i].rpcData.rpcFilterFreq = 0.0f; /* FIXME */
}
}
}
void FACT_INTERNAL_BeginFadeIn(FACTCue *cue)
{
/* TODO */
}
void FACT_INTERNAL_BeginFadeOut(FACTCue *cue)
{
/* TODO */
}
void FACT_INTERNAL_ActivateEvent(
FACTCue *cue,
FACTSound *sound,
FACTTrack *track,
FACTTrackInstance *trackInst,
FACTEvent *evt,
FACTEventInstance *evtInst,
uint32_t elapsed
) {
uint8_t i;
float svResult;
const char *wbName;
uint16_t wbTrack;
uint8_t wbIndex;
FACTWaveBank *wb;
uint8_t skipLoopCheck = 0;
/* STOP */
if (evt->type == FACTEVENT_STOP)
{
/* Stop Cue */
if (evt->stop.flags & 0x02)
{
FACTCue_Stop(cue, evt->stop.flags & 0x01);
}
/* Stop track */
else for (i = 0; i < track->eventCount; i += 1)
if ( track->events[i].type == FACTEVENT_PLAYWAVE ||
track->events[i].type == FACTEVENT_PLAYWAVETRACKVARIATION ||
track->events[i].type == FACTEVENT_PLAYWAVEEFFECTVARIATION ||
track->events[i].type == FACTEVENT_PLAYWAVETRACKEFFECTVARIATION )
{
if (trackInst->events[i].data.wave.wave != NULL)
{
FACTWave_Stop(
trackInst->events[i].data.wave.wave,
evt->stop.flags & 0x01
);
}
}
}
/* PLAYWAVE */
else if ( evt->type == FACTEVENT_PLAYWAVE ||
evt->type == FACTEVENT_PLAYWAVETRACKVARIATION ||
evt->type == FACTEVENT_PLAYWAVEEFFECTVARIATION ||
evt->type == FACTEVENT_PLAYWAVETRACKEFFECTVARIATION )
{
/* Track Variation */
if (evt->wave.isComplex)
{
/* TODO: Complex wave selection */
wbIndex = evt->wave.complex.wavebanks[0];
wbTrack = evt->wave.complex.tracks[0];
}
else
{
wbIndex = evt->wave.simple.wavebank;
wbTrack = evt->wave.simple.track;
}
wbName = cue->parentBank->wavebankNames[wbIndex];
wb = cue->parentBank->parentEngine->wbList;
while (wb != NULL)
{
if (FAudio_strcmp(wbName, wb->name) == 0)
{
break;
}
wb = wb->next;
}
FAudio_assert(wb != NULL);
/* Generate the wave... */
FACTWaveBank_Prepare(
wb,
wbTrack,
evt->wave.flags,
0,
0, /* FIXME: evtInst->loopCount? */
&evtInst->data.wave.wave
);
/* 3D Audio */
if (cue->active3D)
{
FACTWave_SetMatrixCoefficients(
evtInst->data.wave.wave,
cue->srcChannels,
cue->dstChannels,
cue->matrixCoefficients
);
}
else
{
/* TODO: Position/Angle/UseCenterSpeaker */
}
/* Pitch Variation */
if (evt->wave.variationFlags & 0x1000)
{
const int16_t rngPitch = (int16_t) (
FAudio_rng() *
(evt->wave.maxPitch - evt->wave.minPitch)
);
if (evtInst->loopCount < evt->loopCount)
{
/* Variation on Loop */
if (evt->wave.variationFlags & 0x0100)
{
/* Add/Replace */
if (evt->wave.variationFlags & 0x0004)
{
evtInst->data.wave.basePitch += rngPitch;
}
else
{
evtInst->data.wave.basePitch = rngPitch + sound->pitch;
}
}
}
else
{
/* Initial Pitch Variation */
evtInst->data.wave.basePitch = rngPitch + sound->pitch;
}
}
else
{
evtInst->data.wave.basePitch = sound->pitch;
}
/* Volume Variation */
if (evt->wave.variationFlags & 0x2000)
{
const float rngVolume = track->volume + (
FAudio_rng() *
(evt->wave.maxVolume - evt->wave.minVolume)
);
if (evtInst->loopCount < evt->loopCount)
{
/* Variation on Loop */
if (evt->wave.variationFlags & 0x0200)
{
/* Add/Replace */
if (evt->wave.variationFlags & 0x0001)
{
evtInst->data.wave.baseVolume += rngVolume;
}
else
{
evtInst->data.wave.baseVolume = rngVolume + sound->volume;
}
}
}
else
{
/* Initial Volume Variation */
evtInst->data.wave.baseVolume = rngVolume + sound->volume;
}
}
else
{
evtInst->data.wave.baseVolume = sound->volume + track->volume;
}
/* Filter Variation, QFactor/Freq are always together */
if (evt->wave.variationFlags & 0xC000)
{
const float rngQFactor = (
FAudio_rng() *
(evt->wave.maxQFactor - evt->wave.minQFactor)
);
const float rngFrequency = (
FAudio_rng() *
(evt->wave.maxFrequency - evt->wave.minFrequency)
);
if (evtInst->loopCount < evt->loopCount)
{
/* Variation on Loop */
if (evt->wave.variationFlags & 0x0C00)
{
/* TODO: Add/Replace */
/* FIXME: Which is QFactor/Freq?
if (evt->wave.variationFlags & 0x0010)
{
}
else
{
}
if (evt->wave.variationFlags & 0x0040)
{
}
else
{
}
*/
evtInst->data.wave.baseQFactor = rngQFactor;
evtInst->data.wave.baseFrequency = rngFrequency;
}
}
else
{
/* Initial Filter Variation */
evtInst->data.wave.baseQFactor = rngQFactor;
evtInst->data.wave.baseFrequency = rngFrequency;
}
}
else
{
evtInst->data.wave.baseQFactor = track->qfactor;
evtInst->data.wave.baseFrequency = track->frequency;
}
/* For infinite loops with no variation, let Wave do the work */
if (evt->loopCount == 255 && !(evt->wave.variationFlags & 0x0F00))
{
evtInst->data.wave.wave->loopCount = 255;
evtInst->loopCount = 0;
}
/* Play, finally. */
FACTWave_Play(evtInst->data.wave.wave);
}
/* SETVALUE */
else if ( evt->type == FACTEVENT_PITCH ||
evt->type == FACTEVENT_PITCHREPEATING ||
evt->type == FACTEVENT_VOLUME ||
evt->type == FACTEVENT_VOLUMEREPEATING )
{
/* Ramp/Equation */
if (evt->value.settings & 0x01)
{
/* FIXME: Incorporate 2nd derivative into the interpolated pitch */
skipLoopCheck = elapsed <= (evtInst->timestamp + evt->value.ramp.duration);
svResult = (
evt->value.ramp.initialSlope *
evt->value.ramp.duration *
10 /* "Slices" */
) + evt->value.ramp.initialValue;
svResult = (
evt->value.ramp.initialValue +
(svResult - evt->value.ramp.initialValue)
) * FAudio_clamp(
(elapsed - evtInst->timestamp) / evt->value.ramp.duration,
0.0f,
1.0f
);
}
else
{
/* Value/Random */
if (evt->value.equation.flags & 0x04)
{
svResult = evt->value.equation.value1;
}
else if (evt->value.equation.flags & 0x08)
{
svResult = evt->value.equation.value1 + FAudio_rng() * (
evt->value.equation.value2 -
evt->value.equation.value1
);
}
else
{
svResult = 0.0f;
FAudio_assert(0 && "Equation flags?");
}
/* Add/Replace */
if (evt->value.equation.flags & 0x01)
{
evtInst->data.value += svResult;
}
else
{
evtInst->data.value = svResult;
}
}
/* Set the result, finally. */
if ( evt->type == FACTEVENT_PITCH ||
evt->type == FACTEVENT_PITCHREPEATING )
{
/* TODO: FACT_INTERNAL_SetPitch(evt->value*) */
}
else
{
/* TODO: FACT_INTERNAL_SetVolume(evt->value*) */
}
if (skipLoopCheck)
{
return;
}
}
/* MARKER */
else if ( evt->type == FACTEVENT_MARKER ||
evt->type == FACTEVENT_MARKERREPEATING )
{
/* TODO: FACT_INTERNAL_Marker(evt->marker*) */
}
/* ??? */
else
{
FAudio_assert(0 && "Unknown event type!");
}
/* Either loop or mark this event as complete */
if (evtInst->loopCount > 0)
{
if (evtInst->loopCount != 0xFF)
{
evtInst->loopCount -= 1;
}
evtInst->timestamp += evt->timestamp;
}
else
{
evtInst->finished = 1;
}
}
void FACT_INTERNAL_UpdateEngine(FACTAudioEngine *engine)
{
uint16_t i, j;
for (i = 0; i < engine->rpcCount; i += 1)
{
if (engine->rpcs[i].parameter >= RPC_PARAMETER_COUNT)
{
/* FIXME: Why did I make this global vars only...? */
if (!(engine->variables[engine->rpcs[i].variable].accessibility & 0x04))
{
for (j = 0; j < engine->dspPresetCount; j += 1)
{
/* FIXME: This affects all DSP presets!
* What if there's more than one?
*/
FACT_INTERNAL_SetDSPParameter(
&engine->dspPresets[j],
&engine->rpcs[i],
engine->globalVariableValues[engine->rpcs[i].variable]
);
}
}
}
}
}
void FACT_INTERNAL_UpdateCue(FACTCue *cue, uint32_t elapsed)
{
uint8_t i, j;
uint32_t waveState;
FACTSoundInstance *active;
FACTEvent *evt;
FACTEventInstance *evtInst;
uint8_t finished = 1;
/* If we're not running, save some instructions... */
if (cue->state & (FACT_STATE_PAUSED | FACT_STATE_STOPPED))
{
return;
}
/* There's only something to do if we're a Sound. Waves are simple! */
if (cue->active & 0x01)
{
/* TODO: FadeIn/FadeOut? */
cue->state = cue->playing.wave->state;
return;
}
else if (!cue->active)
{
return;
}
/* To get the time on a single Cue, subtract from the global time
* the latest start time minus the total time elapsed (minus pause time)
*/
elapsed -= cue->start - cue->elapsed;
/* FIXME: Multiple sounds may exist for interactive Cues? */
active = &cue->playing.sound;
/* TODO: Interactive Cues, will set `active` based on variable */
/* RPC updates */
FACT_INTERNAL_UpdateRPCs(
cue,
active->sound->rpcCodeCount,
active->sound->rpcCodes,
&active->rpcData
);
for (i = 0; i < active->sound->trackCount; i += 1)
{
FACT_INTERNAL_UpdateRPCs(
cue,
active->sound->tracks[i].rpcCodeCount,
active->sound->tracks[i].rpcCodes,
&active->tracks[i].rpcData
);
}
/* Go through each event for each track */
for (i = 0; i < active->sound->trackCount; i += 1)
for (j = 0; j < active->sound->tracks[i].eventCount; j += 1)
{
evt = &active->sound->tracks[i].events[j];
evtInst = &active->tracks[i].events[j];
if (!evtInst->finished)
{
/* Cue's not done yet...! */
finished = 0;
/* Trigger events at the right time */
if (elapsed > evtInst->timestamp)
{
FACT_INTERNAL_ActivateEvent(
cue,
active->sound,
&active->sound->tracks[i],
&active->tracks[i],
evt,
evtInst,
elapsed
);
}
}
/* Wave updates */
if ( evt->type == FACTEVENT_PLAYWAVE ||
evt->type == FACTEVENT_PLAYWAVETRACKVARIATION ||
evt->type == FACTEVENT_PLAYWAVEEFFECTVARIATION ||
evt->type == FACTEVENT_PLAYWAVETRACKEFFECTVARIATION )
{
if (evtInst->data.wave.wave == NULL)
{
continue;
}
finished = 0;
/* Clear out Waves as they finish */
FACTWave_GetState(
evtInst->data.wave.wave,
&waveState
);
if (waveState & FACT_STATE_STOPPED)
{
FACTWave_Destroy(
evtInst->data.wave.wave
);
evtInst->data.wave.wave = NULL;
continue;
}
/* TODO: Event volume/pitch values */
FACTWave_SetVolume(
evtInst->data.wave.wave,
FACT_INTERNAL_CalculateAmplitudeRatio(
evtInst->data.wave.baseVolume +
active->rpcData.rpcVolume +
active->tracks[i].rpcData.rpcVolume
) * cue->parentBank->parentEngine->categories[active->sound->category].currentVolume
);
FACTWave_SetPitch(
evtInst->data.wave.wave,
(
evtInst->data.wave.basePitch +
active->rpcData.rpcPitch +
active->tracks[i].rpcData.rpcPitch
)
);
/* TODO: Wave updates:
* - Filter (QFactor/Frequency)
* - Reverb
* - Fade in/out
*/
}
}
/* If everything has been played and finished, set STOPPED */
if (finished)
{
cue->state |= FACT_STATE_STOPPED;
cue->state &= ~(FACT_STATE_PLAYING | FACT_STATE_STOPPING);
cue->parentBank->parentEngine->categories[
active->sound->category
].instanceCount -= 1;
cue->data->instanceCount -= 1;
}
}
/* FAudio callback */
void FACT_INTERNAL_OnProcessingPassStart(FAudioEngineCallback *callback)
{
FACTAudioEngineCallback *c = (FACTAudioEngineCallback*) callback;
FACTAudioEngine *engine = c->engine;
FACTSoundBank *sb;
FACTCue *cue, *backup;
uint32_t timestamp;
/* We want the timestamp to be uniform across all Cues.
* Oftentimes many Cues are played at once with the expectation
* that they will sync, so give them all the same timestamp
* so all the various actions will go together even if it takes
* an extra millisecond to get through the whole Cue list.
*/
timestamp = FAudio_timems();
FACT_INTERNAL_UpdateEngine(engine);
sb = engine->sbList;
while (sb != NULL)
{
cue = sb->cueList;
while (cue != NULL)
{
FACT_INTERNAL_UpdateCue(cue, timestamp);
/* Destroy if it's done and not user-handled. */
if (cue->managed && (cue->state & FACT_STATE_STOPPED))
{
backup = cue->next;
FACTCue_Destroy(cue);
cue = backup;
}
else
{
cue = cue->next;
}
}
sb = sb->next;
}
}
/* FIXME: Move this to FAudio */
uint32_t FACT_INTERNAL_GetWave(
FACTWave *wave,
int16_t *decodeCacheL,
int16_t *decodeCacheR,
float *resampleCacheL,
float *resampleCacheR,
uint32_t samples
) {
uint32_t i;
fixed32 cur;
uint64_t sizeRequest;
uint32_t decodeLength, resampleLength = 0;
/* Nothing to see here... */
if (wave->state & (FACT_STATE_PAUSED | FACT_STATE_STOPPED))
{
return 0;
}
/* Update stepping interval if needed */
if (wave->pitch != wave->resample.pitch)
{
const double stepd = (
FAudio_pow(2.0, wave->pitch / 1200.0) *
(double) wave->parentBank->entries[wave->index].Format.nSamplesPerSec /
(double) wave->parentBank->parentEngine->mixFormat->Format.nSamplesPerSec
);
wave->resample.step = DOUBLE_TO_FIXED(stepd);
wave->resample.pitch = wave->pitch;
}
/* If the sample rates match, just decode and convert to float */
if (wave->resample.step == FIXED_ONE)
{
decodeLength = samples;
if (wave->resample.offset & FIXED_FRACTION_MASK)
{
FAudio_memcpy(
decodeCacheL,
wave->resample.padding[0],
RESAMPLE_PADDING * 2
);
FAudio_memcpy(
decodeCacheR,
wave->resample.padding[1],
RESAMPLE_PADDING * 2
);
decodeLength = wave->decode(
wave,
decodeCacheL + RESAMPLE_PADDING,
decodeCacheR + RESAMPLE_PADDING,
samples - RESAMPLE_PADDING
);
wave->resample.offset += decodeLength * FIXED_ONE;
decodeLength += RESAMPLE_PADDING;
}
else
{
decodeLength = wave->decode(
wave,
decodeCacheL,
decodeCacheR,
samples
);
wave->resample.offset += decodeLength * FIXED_ONE;
}
resampleLength = decodeLength;
if (resampleLength > 0)
{
FAudio_memcpy(
wave->resample.padding[0],
(
decodeCacheL +
decodeLength -
RESAMPLE_PADDING
),
RESAMPLE_PADDING * 2
);
FAudio_memcpy(
wave->resample.padding[1],
(
decodeCacheR +
decodeLength -
RESAMPLE_PADDING
),
RESAMPLE_PADDING * 2
);
/* Lazy int16_t to float */
if (wave->srcChannels == 2)
{
for (i = 0; i < resampleLength; i += 1)
{
resampleCacheL[i] = decodeCacheL[i] / 32768.0f;
resampleCacheR[i] = decodeCacheR[i] / 32768.0f;
}
}
else
{
for (i = 0; i < resampleLength; i += 1)
{
resampleCacheL[i] = decodeCacheL[i] / 32768.0f;
}
}
}
return resampleLength;
}
/* The easy part is just multiplying the final output size with the step
* to get the "real" buffer size. But we also need to ceil() to get the
* extra sample needed for interpolating past the "end" of the
* unresampled buffer.
*/
sizeRequest = samples * wave->resample.step;
sizeRequest += (
/* If frac > 0, int goes up by one... */
(wave->resample.offset + FIXED_FRACTION_MASK) &
/* ... then we chop off anything left */
FIXED_FRACTION_MASK
);
sizeRequest >>= FIXED_PRECISION;
/* Only add half the padding length!
* For the starting buffer, we have no pre-pad, for all remaining
* buffers we memcpy the end and that becomes the new pre-pad.
*/
sizeRequest += RESAMPLE_PADDING;
/* FIXME: Can high sample rates ruin this? */