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Implement sound length

This commit is contained in:
Jeffrey Pfau 2013-10-20 16:33:37 -07:00
parent d6e466dda1
commit 4429435071
2 changed files with 103 additions and 58 deletions
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121
src/gba/gba-audio.c
View File

@ -12,7 +12,7 @@ const unsigned GBA_AUDIO_FIFO_SIZE = 8 * sizeof(int32_t);
static int32_t _updateSquareChannel(struct GBAAudioSquareControl* envelope, int duty);
static void _updateEnvelope(struct GBAAudioEnvelope* envelope);
static void _updateSweep(struct GBAAudioChannel1* ch);
static int _updateSweep(struct GBAAudioChannel1* ch);
static int32_t _updateChannel1(struct GBAAudioChannel1* ch);
static int32_t _updateChannel2(struct GBAAudioChannel2* ch);
static int32_t _updateChannel3(struct GBAAudioChannel3* ch);
@ -28,7 +28,6 @@ void GBAAudioInit(struct GBAAudio* audio) {
audio->ch1.envelope.nextStep = INT_MAX;
audio->ch1.control.nextStep = 0;
audio->ch1.nextSweep = INT_MAX;
audio->ch1.playing = 0;
audio->ch1.sample = 0;
audio->ch2.envelope.nextStep = INT_MAX;
audio->ch2.control.nextStep = 0;
@ -74,7 +73,7 @@ int32_t GBAAudioProcessEvents(struct GBAAudio* audio, int32_t cycles) {
audio->nextCh3 -= audio->eventDiff;
audio->nextCh4 -= audio->eventDiff;
if (audio->ch1.envelope.nextStep != INT_MAX) {
if (audio->playingCh1) {
audio->ch1.envelope.nextStep -= audio->eventDiff;
if (audio->ch1.envelope.nextStep <= 0) {
_updateEnvelope(&audio->ch1.envelope);
@ -82,19 +81,33 @@ int32_t GBAAudioProcessEvents(struct GBAAudio* audio, int32_t cycles) {
audio->nextEvent = audio->ch1.envelope.nextStep;
}
}
}
if (audio->ch1.nextSweep != INT_MAX) {
audio->ch1.nextSweep -= audio->eventDiff;
if (audio->ch1.nextSweep <= 0) {
_updateSweep(&audio->ch1);
if (audio->ch1.nextSweep < audio->nextEvent) {
audio->nextEvent = audio->ch1.nextSweep;
if (audio->ch1.nextSweep != INT_MAX) {
audio->ch1.nextSweep -= audio->eventDiff;
if (audio->ch1.nextSweep <= 0) {
audio->playingCh1 = _updateSweep(&audio->ch1);
if (audio->ch1.nextSweep < audio->nextEvent) {
audio->nextEvent = audio->ch1.nextSweep;
}
}
}
if (audio->nextCh1 <= 0) {
audio->nextCh1 += _updateChannel1(&audio->ch1);
if (audio->nextCh1 < audio->nextEvent) {
audio->nextEvent = audio->nextCh1;
}
}
if (audio->ch1.control.stop) {
audio->ch1.control.endTime -= audio->eventDiff;
if (audio->ch1.control.endTime <= 0) {
audio->playingCh1 = 0;
}
}
}
if (audio->ch2.envelope.nextStep != INT_MAX) {
if (audio->playingCh2) {
audio->ch2.envelope.nextStep -= audio->eventDiff;
if (audio->ch2.envelope.nextStep <= 0) {
_updateEnvelope(&audio->ch2.envelope);
@ -102,9 +115,39 @@ int32_t GBAAudioProcessEvents(struct GBAAudio* audio, int32_t cycles) {
audio->nextEvent = audio->ch2.envelope.nextStep;
}
}
if (audio->nextCh2 <= 0) {
audio->nextCh2 += _updateChannel2(&audio->ch2);
if (audio->nextCh2 < audio->nextEvent) {
audio->nextEvent = audio->nextCh2;
}
}
if (audio->ch2.control.stop) {
audio->ch2.control.endTime -= audio->eventDiff;
if (audio->ch2.control.endTime <= 0) {
audio->playingCh2 = 0;
}
}
}
if (audio->ch4.envelope.nextStep != INT_MAX) {
if (audio->playingCh3) {
if (audio->nextCh3 <= 0) {
audio->nextCh3 += _updateChannel3(&audio->ch3);
if (audio->nextCh3 < audio->nextEvent) {
audio->nextEvent = audio->nextCh3;
}
}
if (audio->ch3.control.stop) {
audio->ch3.control.endTime -= audio->eventDiff;
if (audio->ch3.control.endTime <= 0) {
audio->playingCh3 = 0;
}
}
}
if (audio->playingCh4) {
audio->ch4.envelope.nextStep -= audio->eventDiff;
if (audio->ch4.envelope.nextStep <= 0) {
_updateEnvelope(&audio->ch4.envelope);
@ -112,33 +155,19 @@ int32_t GBAAudioProcessEvents(struct GBAAudio* audio, int32_t cycles) {
audio->nextEvent = audio->ch4.envelope.nextStep;
}
}
}
if ((audio->ch1Right || audio->ch1Left) && audio->nextCh1 <= 0) {
audio->nextCh1 += _updateChannel1(&audio->ch1);
if (audio->nextCh1 < audio->nextEvent) {
audio->nextEvent = audio->nextCh1;
if (audio->nextCh4 <= 0) {
audio->nextCh4 += _updateChannel4(&audio->ch4);
if (audio->nextCh4 < audio->nextEvent) {
audio->nextEvent = audio->nextCh4;
}
}
}
if ((audio->ch2Right || audio->ch2Left) && audio->nextCh2 <= 0) {
audio->nextCh2 += _updateChannel2(&audio->ch2);
if (audio->nextCh2 < audio->nextEvent) {
audio->nextEvent = audio->nextCh2;
}
}
if ((audio->ch3Right || audio->ch3Left) && audio->nextCh3 <= 0) {
audio->nextCh3 += _updateChannel3(&audio->ch3);
if (audio->nextCh3 < audio->nextEvent) {
audio->nextEvent = audio->nextCh3;
}
}
if ((audio->ch4Right || audio->ch4Left) && audio->nextCh4 <= 0) {
audio->nextCh4 += _updateChannel4(&audio->ch4);
if (audio->nextCh4 < audio->nextEvent) {
audio->nextEvent = audio->nextCh4;
if (audio->ch4.control.stop) {
audio->ch4.control.endTime -= audio->eventDiff;
if (audio->ch4.control.endTime <= 0) {
audio->playingCh4 = 0;
}
}
}
}
@ -187,16 +216,17 @@ void GBAAudioWriteSOUND1CNT_HI(struct GBAAudio* audio, uint16_t value) {
void GBAAudioWriteSOUND1CNT_X(struct GBAAudio* audio, uint16_t value) {
audio->ch1.control.packed = value;
audio->ch1.control.endTime = (GBA_ARM7TDMI_FREQUENCY * (64 - audio->ch1.envelope.length)) >> 8;
if (audio->ch1.control.restart) {
if (audio->ch1.sweep.time) {
audio->ch1.nextSweep = audio->ch1.sweep.time * SWEEP_CYCLES;
} else {
audio->ch1.nextSweep = INT_MAX;
}
if (!audio->ch1.playing) {
if (!audio->playingCh1) {
audio->nextCh1 = 0;
}
audio->ch1.playing = 1;
audio->playingCh1 = 1;
if (audio->ch1.envelope.stepTime) {
audio->ch1.envelope.nextStep = 0;
} else {
@ -222,7 +252,9 @@ void GBAAudioWriteSOUND2CNT_LO(struct GBAAudio* audio, uint16_t value) {
void GBAAudioWriteSOUND2CNT_HI(struct GBAAudio* audio, uint16_t value) {
audio->ch2.control.packed = value;
audio->ch1.control.endTime = (GBA_ARM7TDMI_FREQUENCY * (64 - audio->ch2.envelope.length)) >> 8;
if (audio->ch2.control.restart) {
audio->playingCh2 = 1;
audio->ch2.envelope.currentVolume = audio->ch2.envelope.initialVolume;
if (audio->ch2.envelope.stepTime) {
audio->ch2.envelope.nextStep = 0;
@ -243,6 +275,10 @@ void GBAAudioWriteSOUND3CNT_HI(struct GBAAudio* audio, uint16_t value) {
void GBAAudioWriteSOUND3CNT_X(struct GBAAudio* audio, uint16_t value) {
audio->ch3.control.packed = value;
audio->ch3.control.endTime = (GBA_ARM7TDMI_FREQUENCY * (256 - audio->ch3.wave.length)) >> 8;
if (audio->ch3.control.restart) {
audio->playingCh3 = 1;
}
}
void GBAAudioWriteSOUND4CNT_LO(struct GBAAudio* audio, uint16_t value) {
@ -256,7 +292,9 @@ void GBAAudioWriteSOUND4CNT_LO(struct GBAAudio* audio, uint16_t value) {
void GBAAudioWriteSOUND4CNT_HI(struct GBAAudio* audio, uint16_t value) {
audio->ch4.control.packed = value;
audio->ch4.control.endTime = (GBA_ARM7TDMI_FREQUENCY * (64 - audio->ch4.envelope.length)) >> 8;
if (audio->ch4.control.restart) {
audio->playingCh4 = 1;
audio->ch4.envelope.currentVolume = audio->ch4.envelope.initialVolume;
if (audio->ch4.envelope.stepTime) {
audio->ch4.envelope.nextStep = 0;
@ -281,7 +319,7 @@ void GBAAudioWriteSOUNDCNT_HI(struct GBAAudio* audio, uint16_t value) {
}
void GBAAudioWriteSOUNDCNT_X(struct GBAAudio* audio, uint16_t value) {
audio->soundcntX = (value & 0xF0) | (audio->soundcntX & 0x0F);
audio->soundcntX = (value & 0x80) | (audio->soundcntX & 0x0F);
}
void GBAAudioWriteWaveRAM(struct GBAAudio* audio, int address, uint32_t value) {
@ -360,7 +398,7 @@ static void _updateEnvelope(struct GBAAudioEnvelope* envelope) {
}
}
static void _updateSweep(struct GBAAudioChannel1* ch) {
static int _updateSweep(struct GBAAudioChannel1* ch) {
if (ch->sweep.direction) {
int frequency = ch->control.frequency;
frequency -= frequency >> ch->sweep.shift;
@ -373,10 +411,11 @@ static void _updateSweep(struct GBAAudioChannel1* ch) {
if (frequency < 2048) {
ch->control.frequency = frequency;
} else {
ch->playing = 0;
return 0;
}
}
ch->nextSweep += ch->sweep.time * SWEEP_CYCLES;
return 1;
}
static int32_t _updateChannel1(struct GBAAudioChannel1* ch) {

40
src/gba/gba-audio.h
View File

@ -37,6 +37,7 @@ struct GBAAudioSquareControl {
};
int hi;
int32_t nextStep;
int32_t endTime;
};
struct GBAAudioChannel1 {
@ -50,7 +51,6 @@ struct GBAAudioChannel1 {
uint16_t packed;
} sweep;
int32_t nextSweep;
int playing;
struct GBAAudioEnvelope envelope;
struct GBAAudioSquareControl control;
@ -84,14 +84,17 @@ struct GBAAudioChannel3 {
uint16_t packed;
} wave;
union {
struct {
unsigned rate : 11;
unsigned : 3;
unsigned stop : 1;
unsigned restart : 1;
struct {
union {
struct {
unsigned rate : 11;
unsigned : 3;
unsigned stop : 1;
unsigned restart : 1;
};
uint16_t packed;
};
uint16_t packed;
int32_t endTime;
} control;
uint32_t wavedata[8];
@ -100,16 +103,19 @@ struct GBAAudioChannel3 {
struct GBAAudioChannel4 {
struct GBAAudioEnvelope envelope;
union {
struct {
unsigned ratio : 3;
unsigned power : 1;
unsigned frequency : 4;
unsigned : 6;
unsigned stop : 1;
unsigned restart : 1;
struct {
union {
struct {
unsigned ratio : 3;
unsigned power : 1;
unsigned frequency : 4;
unsigned : 6;
unsigned stop : 1;
unsigned restart : 1;
};
uint16_t packed;
};
uint16_t packed;
int32_t endTime;
} control;
unsigned lfsr;