Alc/midi/dummy.c

   1
   2 #include "config.h"
   3
   4 #include <stdio.h>
   5 #include <stdlib.h>
   6 #include <string.h>
   7 #include <limits.h>
   8
   9 #include "alMain.h"
  10 #include "alError.h"
  11 #include "evtqueue.h"
  12 #include "rwlock.h"
  13 #include "alu.h"
  14
  15 #include "midi/base.h"
  16
  17 typedef struct DSynth {
  18     DERIVE_FROM_TYPE(MidiSynth);
  19 } DSynth;
  20
  21 static void DSynth_Construct(DSynth *self, ALCdevice *device);
  22 static DECLARE_FORWARD(DSynth, MidiSynth, void, Destruct)
  23 static DECLARE_FORWARD3(DSynth, MidiSynth, ALenum, selectSoundfonts, ALCcontext*, ALsizei, const ALuint*)
  24 static DECLARE_FORWARD1(DSynth, MidiSynth, void, setGain, ALfloat)
  25 static DECLARE_FORWARD(DSynth, MidiSynth, void, stop)
  26 static DECLARE_FORWARD(DSynth, MidiSynth, void, reset)
  27 static DECLARE_FORWARD1(DSynth, MidiSynth, void, update, ALCdevice*)
  28 static void DSynth_process(DSynth *self, ALuint SamplesToDo, ALfloat (*restrict DryBuffer)[BUFFERSIZE]);
  29 DECLARE_DEFAULT_ALLOCATORS(DSynth)
  30 DEFINE_MIDISYNTH_VTABLE(DSynth);
  31
  32
  33 static void DSynth_Construct(DSynth *self, ALCdevice *device)
  34 {
  35     MidiSynth_Construct(STATIC_CAST(MidiSynth, self), device);
  36     SET_VTABLE2(DSynth, MidiSynth, self);
  37 }
  38
  39
  40 static void DSynth_processQueue(DSynth *self, ALuint64 time)
  41 {
  42     EvtQueue *queue = &STATIC_CAST(MidiSynth, self)->EventQueue;
  43
  44     while(queue->pos < queue->size && queue->events[queue->pos].time <= time)
  45         queue->pos++;
  46 }
  47
  48 static void DSynth_process(DSynth *self, ALuint SamplesToDo, ALfloatBUFFERSIZE*restrict UNUSED(DryBuffer))
  49 {
  50     MidiSynth *synth = STATIC_CAST(MidiSynth, self);
  51     ALuint64 curtime;
  52
  53     if(synth->State != AL_PLAYING)
  54         return;
  55
  56     synth->SamplesDone += SamplesToDo;
  57     synth->ClockBase += (synth->SamplesDone/synth->SampleRate) * MIDI_CLOCK_RES;
  58     synth->SamplesDone %= synth->SampleRate;
  59
  60     curtime = MidiSynth_getTime(synth);
  61     DSynth_processQueue(self, maxi64(curtime-1, 0));
  62 }
  63
  64
  65 MidiSynth *DSynth_create(ALCdevice *device)
  66 {
  67     DSynth *synth = DSynth_New(sizeof(*synth));
  68     if(!synth)
  69     {
  70         ERR("Failed to allocate DSynth\n");
  71         return NULL;
  72     }
  73     memset(synth, 0, sizeof(*synth));
  74     DSynth_Construct(synth, device);
  75     return STATIC_CAST(MidiSynth, synth);
  76 }