diff options
| -rw-r--r-- | OpenAL32/Include/alMain.h | 3 | ||||
| -rw-r--r-- | OpenAL32/Include/alMidi.h | 2 | ||||
| -rw-r--r-- | OpenAL32/alMidi.c | 96 |
3 files changed, 101 insertions, 0 deletions
diff --git a/OpenAL32/Include/alMain.h b/OpenAL32/Include/alMain.h index 09a21964..2fad113d 100644 --- a/OpenAL32/Include/alMain.h +++ b/OpenAL32/Include/alMain.h @@ -387,6 +387,9 @@ struct ALCdevice_struct // Map of Filters for this device UIntMap FilterMap; + /* MIDI synth engine */ + struct MidiSynth *Synth; + /* HRTF filter tables */ const struct Hrtf *Hrtf; diff --git a/OpenAL32/Include/alMidi.h b/OpenAL32/Include/alMidi.h index b6504706..1e5c09b5 100644 --- a/OpenAL32/Include/alMidi.h +++ b/OpenAL32/Include/alMidi.h @@ -57,6 +57,8 @@ static const struct MidiSynthVtable T##_MidiSynth_vtable = { \ } +MidiSynth *SynthCreate(ALCdevice *device); + #ifdef __cplusplus } #endif diff --git a/OpenAL32/alMidi.c b/OpenAL32/alMidi.c index a2f2eb12..0dd811fd 100644 --- a/OpenAL32/alMidi.c +++ b/OpenAL32/alMidi.c @@ -105,6 +105,102 @@ static ALenum MidiSynth_insertEvent(MidiSynth *self, ALuint64 time, ALuint event } +typedef struct DSynth { + DERIVE_FROM_TYPE(MidiSynth); +} DSynth; + +static void DSynth_Construct(DSynth *self, ALCdevice *device); +static DECLARE_FORWARD(DSynth, MidiSynth, void, Destruct) +static DECLARE_FORWARD1(DSynth, MidiSynth, void, setState, ALenum) +static DECLARE_FORWARD1(DSynth, MidiSynth, void, update, ALCdevice*) +static void DSynth_process(DSynth *self, ALuint SamplesToDo, ALfloat (*restrict DryBuffer)[BUFFERSIZE]); +static void DSynth_Delete(DSynth *self); +DEFINE_MIDISYNTH_VTABLE(DSynth); + + +static void DSynth_Construct(DSynth *self, ALCdevice *device) +{ + MidiSynth_Construct(STATIC_CAST(MidiSynth, self), device); + SET_VTABLE2(DSynth, MidiSynth, self); +} + + +static void DSynth_processQueue(DSynth *self, ALuint64 time) +{ + EvtQueue *queue = &STATIC_CAST(MidiSynth, self)->EventQueue; + + while(queue->pos < queue->size && queue->events[queue->pos].time <= time) + queue->pos++; + + if(queue->pos == queue->size) + { + queue->pos = 0; + queue->size = 0; + } +} + +static void DSynth_process(DSynth *self, ALuint SamplesToDo, ALfloatBUFFERSIZE*restrict UNUSED(DryBuffer)) +{ + MidiSynth *synth = STATIC_CAST(MidiSynth, self); + ALuint total = 0; + + if(synth->State == AL_INITIAL) + return; + if(synth->State == AL_PAUSED) + return; + + while(total < SamplesToDo) + { + if(synth->SamplesToNext >= 1.0) + { + ALuint todo = minu(SamplesToDo - total, fastf2u(synth->SamplesToNext)); + + total += todo; + synth->SamplesSinceLast += todo; + synth->SamplesToNext -= todo; + } + else + { + ALuint64 time = synth->NextEvtTime; + if(time == UINT64_MAX) + { + synth->SamplesSinceLast += SamplesToDo-total; + break; + } + + synth->SamplesSinceLast -= (time - synth->LastEvtTime) * synth->SamplesPerTick; + synth->SamplesSinceLast = maxd(synth->SamplesSinceLast, 0.0); + synth->LastEvtTime = time; + DSynth_processQueue(self, time); + + synth->NextEvtTime = MidiSynth_getNextEvtTime(synth); + if(synth->NextEvtTime != UINT64_MAX) + synth->SamplesToNext += (synth->NextEvtTime - synth->LastEvtTime) * synth->SamplesPerTick; + } + } +} + + +static void DSynth_Delete(DSynth *self) +{ + free(self); +} + + +MidiSynth *SynthCreate(ALCdevice *device) +{ + DSynth *synth = calloc(1, sizeof(*synth)); + if(!synth) + { + ERR("Failed to allocate DSynth\n"); + return NULL; + } + DSynth_Construct(synth, device); + + return STATIC_CAST(MidiSynth, synth); +} + + void InitEvtQueue(EvtQueue *queue) { queue->events = NULL; |