1 files changed, 128 insertions, 0 deletions
diff --git a/Alc/midi/base.h b/Alc/midi/base.h
new file mode 100644
index 00000000..f900c941
--- /dev/null
+++ b/Alc/midi/base.h
@@ -0,0 +1,128 @@
+#ifndef AL_MIDI_BASE_H
+#define AL_MIDI_BASE_H
+
+#include "alMain.h"
+#include "atomic.h"
+#include "evtqueue.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+struct ALsoundfont;
+
+typedef size_t (*ReaderCb)(void *ptr, size_t size, void *stream);
+typedef struct Reader {
+    ReaderCb cb;
+    void *ptr;
+    int error;
+} Reader;
+#define READ(x_, buf_, len_) ((x_)->cb((buf_), (len_), (x_)->ptr))
+#define READERR(x_)          ((x_)->error)
+
+ALboolean loadSf2(Reader *stream, struct ALsoundfont *sfont, ALCcontext *context);
+
+
+struct MidiSynthVtable;
+
+typedef struct MidiSynth {
+    EvtQueue EventQueue;
+
+    ALuint64 LastEvtTime;
+    ALuint64 NextEvtTime;
+    ALdouble SamplesSinceLast;
+    ALdouble SamplesToNext;
+
+    ALdouble SamplesPerTick;
+
+    /* NOTE: This rwlock is for the state and soundfont. The EventQueue and
+     * related must instead use the device lock as they're used in the mixer
+     * thread.
+     */
+    RWLock Lock;
+
+    struct ALsoundfont **Soundfonts;
+    ALsizei NumSoundfonts;
+
+    volatile ALfloat Gain;
+    volatile ALenum State;
+
+    const struct MidiSynthVtable *vtbl;
+} MidiSynth;
+
+void MidiSynth_Construct(MidiSynth *self, ALCdevice *device);
+void MidiSynth_Destruct(MidiSynth *self);
+ALenum MidiSynth_selectSoundfonts(MidiSynth *self, ALCcontext *context, ALsizei count, const ALuint *ids);
+inline void MidiSynth_setGain(MidiSynth *self, ALfloat gain) { self->Gain = gain; }
+inline ALfloat MidiSynth_getGain(const MidiSynth *self) { return self->Gain; }
+inline void MidiSynth_setState(MidiSynth *self, ALenum state) { ExchangeInt(&self->State, state); }
+inline ALenum MidiSynth_getState(const MidiSynth *self) { return self->State; }
+void MidiSynth_stop(MidiSynth *self);
+inline void MidiSynth_reset(MidiSynth *self) { MidiSynth_stop(self); }
+ALuint64 MidiSynth_getTime(const MidiSynth *self);
+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;
+}
+void MidiSynth_setSampleRate(MidiSynth *self, ALdouble srate);
+inline void MidiSynth_update(MidiSynth *self, ALCdevice *device)
+{ MidiSynth_setSampleRate(self, device->Frequency); }
+ALenum MidiSynth_insertEvent(MidiSynth *self, ALuint64 time, ALuint event, ALsizei param1, ALsizei param2);
+ALenum MidiSynth_insertSysExEvent(MidiSynth *self, ALuint64 time, const ALbyte *data, ALsizei size);
+
+
+struct MidiSynthVtable {
+    void (*const Destruct)(MidiSynth *self);
+
+    ALenum (*const selectSoundfonts)(MidiSynth *self, ALCcontext *context, ALsizei count, const ALuint *ids);
+
+    void (*const setGain)(MidiSynth *self, ALfloat gain);
+    void (*const setState)(MidiSynth *self, ALenum state);
+
+    void (*const stop)(MidiSynth *self);
+    void (*const reset)(MidiSynth *self);
+
+    void (*const update)(MidiSynth *self, ALCdevice *device);
+    void (*const process)(MidiSynth *self, ALuint samples, ALfloat (*restrict DryBuffer)[BUFFERSIZE]);
+
+    void (*const Delete)(MidiSynth *self);
+};
+
+#define DEFINE_MIDISYNTH_VTABLE(T)                                            \
+DECLARE_THUNK(T, MidiSynth, void, Destruct)                                   \
+DECLARE_THUNK3(T, MidiSynth, ALenum, selectSoundfonts, ALCcontext*, ALsizei, const ALuint*) \
+DECLARE_THUNK1(T, MidiSynth, void, setGain, ALfloat)                          \
+DECLARE_THUNK1(T, MidiSynth, void, setState, ALenum)                          \
+DECLARE_THUNK(T, MidiSynth, void, stop)                                       \
+DECLARE_THUNK(T, MidiSynth, void, reset)                                      \
+DECLARE_THUNK1(T, MidiSynth, void, update, ALCdevice*)                        \
+DECLARE_THUNK2(T, MidiSynth, void, process, ALuint, ALfloatBUFFERSIZE*restrict) \
+DECLARE_THUNK(T, MidiSynth, void, Delete)                                     \
+                                                                              \
+static const struct MidiSynthVtable T##_MidiSynth_vtable = {                  \
+    T##_MidiSynth_Destruct,                                                   \
+                                                                              \
+    T##_MidiSynth_selectSoundfonts,                                           \
+    T##_MidiSynth_setGain,                                                    \
+    T##_MidiSynth_setState,                                                   \
+    T##_MidiSynth_stop,                                                       \
+    T##_MidiSynth_reset,                                                      \
+    T##_MidiSynth_update,                                                     \
+    T##_MidiSynth_process,                                                    \
+                                                                              \
+    T##_MidiSynth_Delete,                                                     \
+}
+
+
+MidiSynth *FSynth_create(ALCdevice *device);
+MidiSynth *DSynth_create(ALCdevice *device);
+
+MidiSynth *SynthCreate(ALCdevice *device);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* AL_MIDI_BASE_H */