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#include "config.h"
#include <stdlib.h>
#include <string.h>
#include <limits.h>
#include "alMidi.h"
#include "alMain.h"
#include "alError.h"
#include "evtqueue.h"
#include "rwlock.h"
#include "alu.h"
/* Microsecond resolution */
#define TICKS_PER_SECOND (1000000)
static void MidiSynth_Construct(MidiSynth *self, ALCdevice *device);
static void MidiSynth_Destruct(MidiSynth *self);
static inline void MidiSynth_setState(MidiSynth *self, ALenum state);
static inline ALuint MidiSynth_getTime(const MidiSynth *self);
static inline ALuint64 MidiSynth_getNextEvtTime(const MidiSynth *self);
static void MidiSynth_update(MidiSynth *self, ALCdevice *device);
static void MidiSynth_updateSpeed(MidiSynth *self);
static ALenum MidiSynth_insertEvent(MidiSynth *self, ALuint64 time, ALuint event, ALsizei param1, ALsizei param2);
static void MidiSynth_Construct(MidiSynth *self, ALCdevice *device)
{
InitEvtQueue(&self->EventQueue);
self->LastEvtTime = 0;
self->NextEvtTime = UINT64_MAX;
self->SamplesSinceLast = 0.0;
self->SamplesToNext = 0.0;
self->State = AL_INITIAL;
self->FontName = NULL;
self->SampleRate = device->Frequency;
self->SamplesPerTick = (ALdouble)self->SampleRate / TICKS_PER_SECOND;
MidiSynth_updateSpeed(self);
}
static void MidiSynth_Destruct(MidiSynth *self)
{
free(self->FontName);
self->FontName = NULL;
ResetEvtQueue(&self->EventQueue);
}
static inline void MidiSynth_setState(MidiSynth *self, ALenum state)
{
ExchangeInt(&self->State, state);
}
static inline ALuint MidiSynth_getTime(const MidiSynth *self)
{
ALuint time = self->LastEvtTime + (self->SamplesSinceLast/self->SamplesPerTick);
return clampu(time, self->LastEvtTime, self->NextEvtTime);
}
static inline ALuint64 MidiSynth_getNextEvtTime(const MidiSynth *self)
{
if(self->EventQueue.pos == self->EventQueue.size)
return UINT64_MAX;
return self->EventQueue.events[self->EventQueue.pos].time;
}
static void MidiSynth_update(MidiSynth *self, ALCdevice *device)
{
self->SampleRate = device->Frequency;
MidiSynth_updateSpeed(self);
}
static void MidiSynth_updateSpeed(MidiSynth *self)
{
ALdouble sampletickrate = (ALdouble)self->SampleRate / TICKS_PER_SECOND;
self->SamplesSinceLast = self->SamplesSinceLast * sampletickrate / self->SamplesPerTick;
self->SamplesToNext = self->SamplesToNext * sampletickrate / self->SamplesPerTick;
self->SamplesPerTick = sampletickrate;
}
static ALenum MidiSynth_insertEvent(MidiSynth *self, ALuint64 time, ALuint event, ALsizei param1, ALsizei param2)
{
MidiEvent entry = { time, event, { param1, param2 } };
ALenum err;
err = InsertEvtQueue(&self->EventQueue, &entry);
if(err != AL_NO_ERROR) return err;
if(entry.time < self->NextEvtTime)
{
self->NextEvtTime = entry.time;
self->SamplesToNext = (self->NextEvtTime - self->LastEvtTime) * self->SamplesPerTick;
self->SamplesToNext -= self->SamplesSinceLast;
}
return AL_NO_ERROR;
}
void InitEvtQueue(EvtQueue *queue)
{
queue->events = NULL;
queue->maxsize = 0;
queue->size = 0;
queue->pos = 0;
}
void ResetEvtQueue(EvtQueue *queue)
{
free(queue->events);
queue->events = NULL;
queue->maxsize = 0;
queue->size = 0;
queue->pos = 0;
}
ALenum InsertEvtQueue(EvtQueue *queue, const MidiEvent *evt)
{
ALsizei pos;
if(queue->maxsize == queue->size)
{
if(queue->pos > 0)
{
/* Queue has some stale entries, remove them to make space for more
* events. */
memmove(&queue->events[0], &queue->events[queue->pos],
(queue->size-queue->pos)*sizeof(queue->events[0]));
queue->size -= queue->pos;
queue->pos = 0;
}
else
{
/* Queue is full, double the allocated space. */
void *temp = NULL;
ALsizei newsize;
newsize = (queue->maxsize ? (queue->maxsize<<1) : 16);
if(newsize > queue->maxsize)
temp = realloc(queue->events, newsize * sizeof(queue->events[0]));
if(!temp)
return AL_OUT_OF_MEMORY;
queue->events = temp;
queue->maxsize = newsize;
}
}
pos = queue->pos;
if(queue->size > 0)
{
ALsizei high = queue->size - 1;
while(pos < high)
{
ALsizei mid = pos + (high-pos)/2;
if(queue->events[mid].time < evt->time)
pos = mid + 1;
else
high = mid;
}
while(pos < queue->size && queue->events[pos].time <= evt->time)
pos++;
if(pos < queue->size)
memmove(&queue->events[pos+1], &queue->events[pos],
(queue->size-pos)*sizeof(queue->events[0]));
}
queue->events[pos] = *evt;
queue->size++;
return AL_NO_ERROR;
}
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