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#include "config.h"
#include <stdlib.h>
#include <string.h>
#include <limits.h>
#include "midi/base.h"
#include "alMidi.h"
#include "alMain.h"
#include "alError.h"
#include "alThunk.h"
#include "evtqueue.h"
#include "rwlock.h"
#include "alu.h"
/* MIDI events */
#define SYSEX_EVENT (0xF0)
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;
}
void MidiSynth_Construct(MidiSynth *self, ALCdevice *device)
{
InitEvtQueue(&self->EventQueue);
RWLockInit(&self->Lock);
self->Soundfonts = NULL;
self->NumSoundfonts = 0;
self->Gain = 1.0f;
self->State = AL_INITIAL;
self->ClockBase = 0;
self->SamplesDone = 0;
self->SampleRate = device->Frequency;
}
void MidiSynth_Destruct(MidiSynth *self)
{
ALsizei i;
for(i = 0;i < self->NumSoundfonts;i++)
DecrementRef(&self->Soundfonts[i]->ref);
free(self->Soundfonts);
self->Soundfonts = NULL;
self->NumSoundfonts = 0;
ResetEvtQueue(&self->EventQueue);
}
ALenum MidiSynth_selectSoundfonts(MidiSynth *self, ALCcontext *context, ALsizei count, const ALuint *ids)
{
ALCdevice *device = context->Device;
ALsoundfont **sfonts;
ALsizei i;
if(self->State != AL_INITIAL && self->State != AL_STOPPED)
return AL_INVALID_OPERATION;
sfonts = calloc(1, count * sizeof(sfonts[0]));
if(!sfonts) return AL_OUT_OF_MEMORY;
for(i = 0;i < count;i++)
{
if(ids[i] == 0)
sfonts[i] = ALsoundfont_getDefSoundfont(context);
else if(!(sfonts[i]=LookupSfont(device, ids[i])))
{
free(sfonts);
return AL_INVALID_VALUE;
}
}
for(i = 0;i < count;i++)
IncrementRef(&sfonts[i]->ref);
sfonts = ExchangePtr((XchgPtr*)&self->Soundfonts, sfonts);
count = ExchangeInt(&self->NumSoundfonts, count);
for(i = 0;i < count;i++)
DecrementRef(&sfonts[i]->ref);
free(sfonts);
return AL_NO_ERROR;
}
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);
extern inline ALenum MidiSynth_getState(const MidiSynth *self);
void MidiSynth_stop(MidiSynth *self)
{
ResetEvtQueue(&self->EventQueue);
self->ClockBase = 0;
self->SamplesDone = 0;
}
extern inline void MidiSynth_reset(MidiSynth *self);
extern inline ALuint64 MidiSynth_getTime(const MidiSynth *self);
extern inline ALuint64 MidiSynth_getNextEvtTime(const MidiSynth *self);
void MidiSynth_setSampleRate(MidiSynth *self, ALuint srate)
{
if(self->SampleRate != srate)
{
self->ClockBase += self->SamplesDone * MIDI_CLOCK_RES / self->SampleRate;
self->SamplesDone = 0;
self->SampleRate = srate;
}
}
extern inline void MidiSynth_update(MidiSynth *self, ALCdevice *device);
ALenum MidiSynth_insertEvent(MidiSynth *self, ALuint64 time, ALuint event, ALsizei param1, ALsizei param2)
{
MidiEvent entry;
entry.time = time;
entry.event = event;
entry.param.val[0] = param1;
entry.param.val[1] = param2;
return InsertEvtQueue(&self->EventQueue, &entry);
}
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;
}
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