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Added mixer and sound (c side)

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This commit is contained in:
rnlf
2017-01-22 01:01:24 +01:00
parent d78f203674
commit 5f6daa497f
6 changed files with 195 additions and 19 deletions
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80
src/soundblaster.c
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@@ -44,6 +44,8 @@ static uint16_t dmaChannel;
#define BLASTER_PROGRAM_STEREO 0x20
#define BLASTER_PROGRAM_SIGNED 0x10
#define BLASTER_SPEAKER_ON_CMD 0xD1
#define BLASTER_SPEAKER_OFF_CMD 0xD3
#define BLASTER_EXIT_AUTO_DMA 0xD9
// PIC
@@ -78,8 +80,10 @@ static const struct {
{ 0xC8, 0xCA, 0xD4, 0xD6, 0xD8, 0x89 },
{ 0xCC, 0xCE, 0xD4, 0xD6, 0xD8, 0x8A }
};
int stopDma = 0;
// ISR data
int isrInstalled = 0;
static _go32_dpmi_seginfo oldBlasterHandler, newBlasterHandler;
int writePage = 0;
@@ -87,14 +91,13 @@ static soundblaster_getSampleProc getSamples;
static void writeDSP(uint8_t value) {
while((inportb(baseAddress + BLASTER_WRITE_PORT) &
BLASTER_WRITE_BUFFER_STATUS_UNAVAIL) != 0)
;
BLASTER_WRITE_BUFFER_STATUS_UNAVAIL) != 0) {}
outportb(baseAddress + BLASTER_WRITE_PORT, value);
}
static int resetBlaster() {
static int resetBlaster(void) {
for(int j = 0; j < 1000; ++j) {
outportb(baseAddress + BLASTER_RESET_PORT, 1);
delay(1);
@@ -112,19 +115,24 @@ static int resetBlaster() {
}
static void soundblasterISR() {
outportb(baseAddress + BLASTER_MIXER_OUT_PORT,
BLASTER_MIXER_INTERRUPT_STATUS);
uint8_t status = inportb(baseAddress + BLASTER_MIXER_IN_PORT);
static void soundblasterISR(void) {
if(stopDma == 1) {
writeDSP(BLASTER_EXIT_AUTO_DMA);
stopDma = 2;
} else {
outportb(baseAddress + BLASTER_MIXER_OUT_PORT,
BLASTER_MIXER_INTERRUPT_STATUS);
uint8_t status = inportb(baseAddress + BLASTER_MIXER_IN_PORT);
if(status & BLASTER_16BIT_INTERRUPT) {
uint8_t* dst = (uint8_t*)(sampleBuffer)
+ writePage * SAMPLE_BUFFER_SIZE / 2;
if(status & BLASTER_16BIT_INTERRUPT) {
uint8_t* dst = (uint8_t*)(sampleBuffer)
+ writePage * SAMPLE_BUFFER_SIZE / 2;
memcpy(dst, getSamples(), SAMPLE_BUFFER_SIZE / 2);
memcpy(dst, getSamples(), SAMPLE_BUFFER_SIZE / 2);
writePage = 1 - writePage;
inportb(baseAddress + BLASTER_INTERRUPT_ACKNOWLEDGE_16BIT);
writePage = 1 - writePage;
inportb(baseAddress + BLASTER_INTERRUPT_ACKNOWLEDGE_16BIT);
}
}
if(irq >= 8) {
@@ -134,7 +142,7 @@ static void soundblasterISR() {
}
static void setBlasterISR() {
static void setBlasterISR(void) {
// Map IRQ to interrupt number on the CPU
uint16_t interruptVector = irq + irq + (irq < 8)
? PIC_IRQ07_MAP
@@ -156,6 +164,8 @@ static void setBlasterISR() {
uint8_t irqmask = inportb(PIC2_DATA);
outportb(PIC2_DATA, irqmask & ~(1<<(irq-8)));
}
isrInstalled = 1;
}
@@ -175,7 +185,7 @@ static int parseBlasterSettings(void) {
}
static int allocSampleBuffer() {
static int allocSampleBuffer(void) {
static int maxRetries = 10;
int selectors[maxRetries];
int current;
@@ -211,11 +221,16 @@ static int allocSampleBuffer() {
}
static void turnSpeakerOn() {
static void turnSpeakerOn(void) {
writeDSP(BLASTER_SPEAKER_ON_CMD);
}
static void turnSpeakerOff(void) {
writeDSP(BLASTER_SPEAKER_OFF_CMD);
}
static void dmaSetupTransfer(int channel,
uint8_t direction,
bool autoReload,
@@ -252,7 +267,7 @@ static void dmaSetupTransfer(int channel,
}
static void startDMAOutput() {
static void startDMAOutput(void) {
uint32_t offset = (uint32_t)sampleBuffer;
uint32_t samples = SAMPLE_BUFFER_SIZE / sizeof(int16_t);
@@ -302,6 +317,33 @@ int soundblaster_init(soundblaster_getSampleProc getsamplesproc) {
}
void soundblaster_deinit(void) {
static void deallocSampleBuffer(void) {
__dpmi_free_dos_memory(sampleBufferSelector);
}
static void resetBlasterISR(void) {
if(isrInstalled == 1) {
uint16_t interruptVector = irq + irq + (irq < 8)
? PIC_IRQ07_MAP
: PIC_IRQ8F_MAP;
_go32_dpmi_set_protected_mode_interrupt_vector(interruptVector, &oldBlasterHandler);
isrInstalled = 0;
}
}
static void stopDMAOutput(void) {
stopDma = 1;
while(stopDma == 1) {}
}
void soundblaster_deinit(void) {
turnSpeakerOff();
stopDMAOutput();
resetBlaster();
resetBlasterISR();
deallocSampleBuffer();
}