// SetFire to represent a single audio source playing at a specific time in the future (in time.Duration from play start), with sustain time.Duration, volume from 0 to 1, and pan from -1 to +1
func SetFire(source string, begin time.Duration, sustain time.Duration, volume float64, pan float64) *fire.Fire {
mixPrepareSource(mixSourcePrefix + source)
beginTz := spec.Tz(begin.Nanoseconds() / masterTzDur.Nanoseconds())
var endTz spec.Tz
if sustain != 0 {
endTz = beginTz + spec.Tz(sustain.Nanoseconds()/masterTzDur.Nanoseconds())
}
f := fire.New(mixSourcePrefix+source, beginTz, endTz, volume, pan)
mixReadyFires = append(mixReadyFires, f)
return f
}
func TestBase(t *testing.T) {
testLengthTz := spec.Tz(100)
src := "sound.wav"
bgnTz := spec.Tz(5984)
endTz := bgnTz + testLengthTz
vol := float64(1)
pan := float64(0)
fire := New(src, bgnTz, endTz, vol, pan)
// before start:
assert.Equal(t, spec.Tz(0), fire.At(bgnTz-2))
assert.Equal(t, spec.Tz(0), fire.At(bgnTz-1))
assert.Equal(t, fireStateReady, fire.state)
assert.Equal(t, true, fire.IsAlive())
// start:
assert.Equal(t, spec.Tz(0), fire.At(bgnTz))
assert.Equal(t, fireStatePlay, fire.state)
assert.Equal(t, true, fire.IsAlive())
// after start / before end:
for n := spec.Tz(1); n < testLengthTz; n++ {
assert.Equal(t, spec.Tz(n), fire.At(bgnTz+n))
}
// end:
assert.Equal(t, testLengthTz, fire.At(endTz))
assert.Equal(t, fireStateDone, fire.state)
assert.Equal(t, false, fire.IsAlive())
// after end:
assert.Equal(t, spec.Tz(0), fire.At(endTz+1))
}
// Configure the mixer frequency, format, channels & sample rate.
func Configure(s spec.AudioSpec) {
masterSpec = &s
masterFreq = float64(s.Freq)
masterTzDur = time.Second / time.Duration(masterFreq)
masterCycleDurTz = spec.Tz(masterFreq)
source.Configure(s)
}
// OutputContinueTo to mix and output as []byte via stdout, up to a specified duration-since-start
func OutputContinueTo(t time.Duration) {
deltaDur := t - outputToDur
deltaTz := spec.Tz(masterFreq * float64((deltaDur)/time.Second))
debug.Printf("mix.OutputContinueTo(%+v) deltaDur:%+v nowTz:%+v deltaTz:%+v begin...", t, deltaDur, nowTz, deltaTz)
bind.OutputNext(deltaTz)
outputToDur = t
debug.Printf("mix.OutputContinueTo(%+v) ...done! nowTz:%+v outputToDur:%+v", t, nowTz, outputToDur)
}
func GetLength(src string) spec.Tz {
source := Get(src)
if source != nil {
return source.Length()
} else {
return spec.Tz(0)
}
}
func testSourceAssertSound(t *testing.T, source *Source, channels int) (totalSoundMovement sample.Value) {
for tz := spec.Tz(0); tz < source.Length(); tz++ {
smp := source.SampleAt(tz, 1, 0)
assert.Equal(t, channels, len(smp))
for c := 0; c < channels; c++ {
totalSoundMovement += smp[c].Abs()
}
}
return
}
func (s *Source) load() {
s.state = LOADING
s.sample, s.audioSpec = bind.LoadWAV(s.URL)
if s.audioSpec == nil {
// TODO: handle errors loading file
debug.Printf("could not load WAV %s\n", s.URL)
}
s.maxTz = spec.Tz(len(s.sample))
s.state = READY
}
// GetCycleDurationTz sets the duration of a mix cycle.
func SetCycleDuration(d time.Duration) {
if masterFreq == 0 {
panic("Must specify mixing frequency before setting cycle duration!")
}
masterCycleDurTz = spec.Tz((d / time.Second) * time.Duration(masterFreq))
}
func TestSetGetMixCycleDuration(t *testing.T) {
testAPISetup()
SetMixCycleDuration(2 * time.Second)
assert.Equal(t, spec.Tz(88200), mix.GetCycleDurationTz())
}
func OutputNext(numSamples spec.Tz) (err error) {
for n := spec.Tz(0); n < numSamples; n++ {
writer.Write(sample.OutNextBytes())
}
return
}