Alc/midi/base.h

   1 #ifndef AL_MIDI_BASE_H
   2 #define AL_MIDI_BASE_H
   3
   4 #include "alMain.h"
   5 #include "atomic.h"
   6 #include "evtqueue.h"
   7
   8 #ifdef __cplusplus
   9 extern "C" {
  10 #endif
  11
  12 struct ALsoundfont;
  13
  14 typedef size_t (*ReaderCb)(void *ptr, size_t size, void *stream);
  15 typedef struct Reader {
  16     ReaderCb cb;
  17     void *ptr;
  18     int error;
  19 } Reader;
  20 inline size_t Reader_read(Reader *self, void *buf, size_t len)
  21 {
  22     size_t got = (!self->error) ? self->cb(buf, len, self->ptr) : 0;
  23     if(got < len) self->error = 1;
  24     return got;
  25 }
  26 #define READERR(x_) ((x_)->error)
  27
  28 ALboolean loadSf2(Reader *stream, struct ALsoundfont *sfont, ALCcontext *context);
  29
  30
  31 #define MIDI_CLOCK_RES  U64(1000000000)
  32
  33
  34 struct MidiSynthVtable;
  35
  36 typedef struct MidiSynth {
  37     EvtQueue EventQueue;
  38
  39     ALuint64 ClockBase;
  40     ALuint SamplesDone;
  41     ALuint SampleRate;
  42
  43     /* NOTE: This rwlock is for the state and soundfont. The EventQueue and
  44      * related must instead use the device lock as they're used in the mixer
  45      * thread.
  46      */
  47     RWLock Lock;
  48
  49     struct ALsoundfont **Soundfonts;
  50     ALsizei NumSoundfonts;
  51
  52     volatile ALfloat Gain;
  53     volatile ALenum State;
  54
  55     const struct MidiSynthVtable *vtbl;
  56 } MidiSynth;
  57
  58 void MidiSynth_Construct(MidiSynth *self, ALCdevice *device);
  59 void MidiSynth_Destruct(MidiSynth *self);
  60 ALenum MidiSynth_selectSoundfonts(MidiSynth *self, ALCcontext *context, ALsizei count, const ALuint *ids);
  61 inline void MidiSynth_setGain(MidiSynth *self, ALfloat gain) { self->Gain = gain; }
  62 inline ALfloat MidiSynth_getGain(const MidiSynth *self) { return self->Gain; }
  63 inline void MidiSynth_setState(MidiSynth *self, ALenum state) { ExchangeInt(&self->State, state); }
  64 inline ALenum MidiSynth_getState(const MidiSynth *self) { return self->State; }
  65 void MidiSynth_stop(MidiSynth *self);
  66 inline void MidiSynth_reset(MidiSynth *self) { MidiSynth_stop(self); }
  67 inline ALuint64 MidiSynth_getTime(const MidiSynth *self)
  68 { return self->ClockBase + (self->SamplesDone*MIDI_CLOCK_RES/self->SampleRate); }
  69 inline ALuint64 MidiSynth_getNextEvtTime(const MidiSynth *self)
  70 {
  71     if(self->EventQueue.pos == self->EventQueue.size)
  72         return UINT64_MAX;
  73     return self->EventQueue.events[self->EventQueue.pos].time;
  74 }
  75 void MidiSynth_setSampleRate(MidiSynth *self, ALuint srate);
  76 inline void MidiSynth_update(MidiSynth *self, ALCdevice *device)
  77 { MidiSynth_setSampleRate(self, device->Frequency); }
  78 ALenum MidiSynth_insertEvent(MidiSynth *self, ALuint64 time, ALuint event, ALsizei param1, ALsizei param2);
  79 ALenum MidiSynth_insertSysExEvent(MidiSynth *self, ALuint64 time, const ALbyte *data, ALsizei size);
  80
  81
  82 struct MidiSynthVtable {
  83     void (*const Destruct)(MidiSynth *self);
  84
  85     ALenum (*const selectSoundfonts)(MidiSynth *self, ALCcontext *context, ALsizei count, const ALuint *ids);
  86
  87     void (*const setGain)(MidiSynth *self, ALfloat gain);
  88
  89     void (*const stop)(MidiSynth *self);
  90     void (*const reset)(MidiSynth *self);
  91
  92     void (*const update)(MidiSynth *self, ALCdevice *device);
  93     void (*const process)(MidiSynth *self, ALuint samples, ALfloat (*restrict DryBuffer)[BUFFERSIZE]);
  94
  95     void (*const Delete)(void *ptr);
  96 };
  97
  98 #define DEFINE_MIDISYNTH_VTABLE(T)                                            \
  99 DECLARE_THUNK(T, MidiSynth, void, Destruct)                                   \
 100 DECLARE_THUNK3(T, MidiSynth, ALenum, selectSoundfonts, ALCcontext*, ALsizei, const ALuint*) \
 101 DECLARE_THUNK1(T, MidiSynth, void, setGain, ALfloat)                          \
 102 DECLARE_THUNK(T, MidiSynth, void, stop)                                       \
 103 DECLARE_THUNK(T, MidiSynth, void, reset)                                      \
 104 DECLARE_THUNK1(T, MidiSynth, void, update, ALCdevice*)                        \
 105 DECLARE_THUNK2(T, MidiSynth, void, process, ALuint, ALfloatBUFFERSIZE*restrict) \
 106 static void T##_MidiSynth_Delete(void *ptr)                                   \
 107 { T##_Delete(STATIC_UPCAST(T, MidiSynth, (MidiSynth*)ptr)); }                 \
 108                                                                               \
 109 static const struct MidiSynthVtable T##_MidiSynth_vtable = {                  \
 110     T##_MidiSynth_Destruct,                                                   \
 111                                                                               \
 112     T##_MidiSynth_selectSoundfonts,                                           \
 113     T##_MidiSynth_setGain,                                                    \
 114     T##_MidiSynth_stop,                                                       \
 115     T##_MidiSynth_reset,                                                      \
 116     T##_MidiSynth_update,                                                     \
 117     T##_MidiSynth_process,                                                    \
 118                                                                               \
 119     T##_MidiSynth_Delete,                                                     \
 120 }
 121
 122
 123 MidiSynth *SSynth_create(ALCdevice *device);
 124 MidiSynth *FSynth_create(ALCdevice *device);
 125 MidiSynth *DSynth_create(ALCdevice *device);
 126
 127 MidiSynth *SynthCreate(ALCdevice *device);
 128
 129 #ifdef __cplusplus
 130 }
 131 #endif
 132
 133 #endif /* AL_MIDI_BASE_H */