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