Fixed audio playing

[kvidha.git] / sb.c

#include <SDL/SDL.h>\r
\r
#include "dblbuf.h"\r
#include "executor.h"\r
#include "kvidha.h"\r
\r
static unsigned short SoundBufferPos;\r
\r
void StartPlayBack(void)\r
{\r
    SDL_PauseAudio(0);\r
    return;\r
}\r
\r
static void SBCallback(void *uudata, signed short *Buffer, int Length)\r
{\r
    int i;\r
    unsigned short Pos, Cur, Left;\r
    \r
    Pos = 0;\r
    Length /= 2;\r
    while(Length > 0)\r
    {\r
	if(SoundBufferPos >= (SB_SIZE >> 1))\r
	{\r
	    FillBuffer();\r
	    SoundBufferPos = 0;\r
	}\r
	Left = (SB_SIZE >> 1) - SoundBufferPos;\r
	Cur = (Length > Left)?Left:Length;\r
	for(i = 0; i < Cur; i++)\r
	    Buffer[Pos + i] = (((signed char)SoundBuffer[SoundBufferPos + i]) - 128) * 255;\r
	Pos += Cur;\r
	SoundBufferPos += Cur;\r
	Length -= Cur;\r
    }\r
}\r
\r
unsigned char SBReset(void)\r
{\r
    SDL_AudioSpec my, got;\r
    \r
    SoundBufferPos = SB_SIZE;\r
    my.freq = 44100;\r
    my.format = AUDIO_S16;\r
    my.channels = 1;\r
    my.samples = SB_SIZE >> 1;\r
    my.callback = (void (*)(void *, unsigned char *, int))SBCallback;\r
    if(SDL_OpenAudio(&my, &got) < 0)\r
    {\r
	printf("Could not open SDL audio: %s\n", SDL_GetError());\r
	return(1);\r
    }\r
    if((got.freq != 44100) ||\r
       (got.format != AUDIO_S16) ||\r
       (got.channels != 1))\r
    {\r
	printf("Audio format mismatch(%i %i %i)!\n", got.freq, got.format, got.channels);\r
	return(1);\r
    }\r
    return(0);\r
}\r
\r
void TerminatePlayBack(void)\r
{\r
    SDL_PauseAudio(1);\r
    return;\r
}\r
\r
/*void DSPOutput(unsigned char Value)\r
{\r
    while((inp(DSPAddress + 12) & 0x80) == 0x80);\r
    outp(DSPAddress + 12, Value);\r
}\r
\r
unsigned char DSPInput(void)\r
{\r
    while((inp(DSPAddress + 14) & 0x80) == 0);\r
    return(inp(DSPAddress + 10));\r
}\r
\r
void StartPlayBack(void)\r
{\r
    unsigned long PhysAddress;\r
\r
    PhysAddress = ((unsigned long)DOSSoundBuffer.rm_segment << 4);\r
    outp((DMAChannel < 4)?10:0xD4, 4 | (DMAChannel & 3));\r
    outp((DMAChannel < 4)?12:0xD8, 0);\r
    outp((DMAChannel < 4)?11:0xD6, 0x58 | (DMAChannel & 3));\r
    outp(DMAAddress, (unsigned char)(PhysAddress & 0xFF));\r
    outp(DMAAddress, (unsigned char)((PhysAddress & 0xFF00) >> 8));\r
    outp(DMAPage, (unsigned char)((PhysAddress & 0x0F0000) >> 16));\r
    outp(DMACount, (unsigned char)((SB_SIZE - 1) & 0xFF));\r
    outp(DMACount, (unsigned char)(((SB_SIZE - 1) & 0xFF00) >> 8));\r
    outp((DMAChannel < 4)?10:0xD4, (DMAChannel & 3));\r
    DSPOutput(0x40);\r
    DSPOutput((unsigned char)(((65536 - (256000000 / ((unsigned long)SBSampleRate))) & 0xFF00) / 0x100));\r
    DSPOutput(0x48);\r
    DSPOutput((unsigned char)((SB_SIZE - 2) >> 1));\r
    DSPOutput((unsigned char)((SB_SIZE - 2) >> 9));\r
    DSPOutput(0x1C);\r
}\r
\r
void SBInt(void)\r
{\r
    if(DMAChannel < 4)\r
    {\r
        inp(DSPAddress + 14);\r
    } else {\r
        outp(DSPAddress + 4, 0x82);\r
        if((inp(DSPAddress + 5) & 2) == 2)\r
            inp(DSPAddress + 15);\r
    }\r
    if(ReadyBuffer == 0)\r
        ReadyBuffer = 1;\r
    else\r
        ReadyBuffer = 0;\r
    BufferReady = 1;\r
    FillBuffer();\r
    outp(PICAddress, 0x20);\r
}\r
\r
unsigned char SBReset(void)\r
{\r
    unsigned short i, Success;\r
    unsigned long o;\r
\r
    Success = 0;\r
    for(i = 0; (i < 5) && (Success == 0); i++)\r
    {\r
        outp(DSPAddress + 6, 1);\r
        for(o = 0; o < 100000; o++);\r
        outp(DSPAddress + 6, 0);\r
        if(DSPInput() == 0xAA)\r
            Success = 1;\r
    }\r
    if(Success == 0)\r
        return(1);\r
    switch(DMAChannel)\r
    {\r
        case 0:\r
            DMAPage = 0x87;\r
            break;\r
        case 1:\r
            DMAPage = 0x83;\r
            break;\r
        case 2:\r
            DMAPage = 0x81;\r
            break;\r
        case 3:\r
            DMAPage = 0x82;\r
            break;\r
        case 4:\r
            DMAPage = 0x8F;\r
            break;\r
        case 5:\r
            DMAPage = 0x8B;\r
            break;\r
        case 6:\r
            DMAPage = 0x89;\r
            break;\r
        case 7:\r
            DMAPage = 0x8A;\r
            break;\r
        default:\r
            return(2);\r
    }\r
    if(DMAChannel < 4)\r
    {\r
        DMAAddress = DMAChannel << 1;\r
        DMACount = (DMAChannel << 1) + 1;\r
    } else {\r
        DMAAddress = 0xC0 + ((DMAChannel - 4) << 2);\r
        DMACount = 0xC2 + ((DMAChannel - 4) << 2);\r
    }\r
    PICAddress = (IRQLine >= 8)?0xA0:0x20;\r
    outp(DSPAddress + 4, 10);\r
    outp(DSPAddress + 5, 0);\r
    outp(DSPAddress + 4, 4);\r
    outp(DSPAddress + 5, 255);\r
    outp(DSPAddress + 4, 34);\r
    outp(DSPAddress + 5, 255);\r
    DSPOutput(0xD1);\r
    SetISR(IRQLine + ((IRQLine >= 8)?0x68:8), (unsigned long)SBInt, &NewSBInt, &OldSBInt);\r
    OldMask = inp(PICAddress + 1);\r
    outp(PICAddress + 1, OldMask & ~(1 << ((IRQLine >= 8)?(IRQLine - 8):IRQLine)));\r
    return(0);\r
}\r
\r
void TerminatePlayBack(void)\r
{\r
    DSPOutput((unsigned char)((DMAChannel < 4)?0xDA:0xD9));\r
    outp(PICAddress + 1, OldMask);\r
    ReturnISR(IRQLine + ((IRQLine >= 8)?0x68:8), &NewSBInt, &OldSBInt);\r
}\r
*/\r