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#include "config.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <limits.h>
#include "midi/base.h"
#include "alMain.h"
#include "alError.h"
#include "evtqueue.h"
#include "rwlock.h"
#include "alu.h"
/* Microsecond resolution */
#define TICKS_PER_SECOND (1000000)
/* MIDI events */
#define SYSEX_EVENT (0xF0)
void MidiSynth_Construct(MidiSynth *self, ALCdevice *device)
{
InitEvtQueue(&self->EventQueue);
RWLockInit(&self->Lock);
self->Gain = 1.0f;
self->State = AL_INITIAL;
self->LastEvtTime = 0;
self->NextEvtTime = UINT64_MAX;
self->SamplesSinceLast = 0.0;
self->SamplesToNext = 0.0;
self->SamplesPerTick = (ALdouble)device->Frequency / TICKS_PER_SECOND;
}
void MidiSynth_Destruct(MidiSynth *self)
{
ResetEvtQueue(&self->EventQueue);
}
const char *MidiSynth_getFontName(const MidiSynth* UNUSED(self), const char *filename)
{
if(!filename || !filename[0])
filename = getenv("ALSOFT_SOUNDFONT");
if(!filename || !filename[0])
filename = GetConfigValue("midi", "soundfont", "");
if(!filename[0])
WARN("No default soundfont found\n");
return filename;
}
extern inline void MidiSynth_setGain(MidiSynth *self, ALfloat gain);
extern inline ALfloat MidiSynth_getGain(const MidiSynth *self);
extern inline void MidiSynth_setState(MidiSynth *self, ALenum state);
void MidiSynth_stop(MidiSynth *self)
{
ResetEvtQueue(&self->EventQueue);
self->LastEvtTime = 0;
self->NextEvtTime = UINT64_MAX;
self->SamplesSinceLast = 0.0;
self->SamplesToNext = 0.0;
}
extern inline void MidiSynth_reset(MidiSynth *self);
ALuint64 MidiSynth_getTime(const MidiSynth *self)
{
ALuint64 time = self->LastEvtTime + (self->SamplesSinceLast/self->SamplesPerTick);
return clampu(time, self->LastEvtTime, self->NextEvtTime);
}
extern inline ALuint64 MidiSynth_getNextEvtTime(const MidiSynth *self);
void MidiSynth_setSampleRate(MidiSynth *self, ALdouble srate)
{
ALdouble sampletickrate = srate / TICKS_PER_SECOND;
self->SamplesSinceLast = self->SamplesSinceLast * sampletickrate / self->SamplesPerTick;
self->SamplesToNext = self->SamplesToNext * sampletickrate / self->SamplesPerTick;
self->SamplesPerTick = sampletickrate;
}
extern inline void MidiSynth_update(MidiSynth *self, ALCdevice *device);
ALenum MidiSynth_insertEvent(MidiSynth *self, ALuint64 time, ALuint event, ALsizei param1, ALsizei param2)
{
MidiEvent entry;
ALenum err;
entry.time = time;
entry.event = event;
entry.param.val[0] = param1;
entry.param.val[1] = param2;
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;
}
ALenum MidiSynth_insertSysExEvent(MidiSynth *self, ALuint64 time, const ALbyte *data, ALsizei size)
{
MidiEvent entry;
ALenum err;
entry.time = time;
entry.event = SYSEX_EVENT;
entry.param.sysex.size = size;
entry.param.sysex.data = malloc(size);
if(!entry.param.sysex.data)
return AL_OUT_OF_MEMORY;
memcpy(entry.param.sysex.data, data, size);
err = InsertEvtQueue(&self->EventQueue, &entry);
if(err != AL_NO_ERROR)
{
free(entry.param.sysex.data);
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)
{
ALsizei i;
for(i = 0;i < queue->size;i++)
{
if(queue->events[i].event == SYSEX_EVENT)
{
free(queue->events[i].param.sysex.data);
queue->events[i].param.sysex.data = NULL;
}
}
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. */
for(pos = 0;pos < queue->pos;pos++)
{
if(queue->events[pos].event == SYSEX_EVENT)
{
free(queue->events[pos].param.sysex.data);
queue->events[pos].param.sysex.data = NULL;
}
}
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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