dsp.cpp

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/*
 *  ix / D:\rnd\prj\ix\win95\dsp\dsp.cpp
 *
 *  Original address range: 0x00444910 - 0x004451B4   (21 functions)
 *  Range is exact: recovered from this module's own assert __FILE__ anchors in
 *  the shipped debug build (see docs/ORDER.md).
 *
 *  Implement in ADDRESS ORDER -- MSVC emits functions in source order, so the
 *  list below is the original source order of this file.
 */
#include "ix.h"
#include <dsound.h>
#include <stdlib.h>
#include <string.h>
 
#define IX_DSP_FILE "D:\\rnd\\prj\\ix\\win95\\dsp\\dsp.cpp"
 
HANDLE g_hMixerTask; /* 0x005c4ec0 */
HWND g_4_hDspWnd; /* 0x005c4ec4 */
HANDLE g_2_hMixerRouseEvent; /* 0x005c4ec8 */
unsigned int g_3_dwMixWriteOffset; /* 0x005c4ecc */
LPDIRECTSOUND g_1_pDirectSound; /* 0x005c4ed0 */
unsigned int g_dwMixerScratchSize; /* 0x005c4ed4 */
unsigned int g_5_dwSoundOptions; /* 0x005c4ed8 */
DWORD g_1_dwMixWorkerId; /* 0x005c4edc */
LPDIRECTSOUNDBUFFER g_pMixerBuffer; /* 0x005c4ee0 */
unsigned int g_6_dwDsoundTick; /* 0x005c52e8 */
LPDIRECTSOUNDBUFFER g_1_pPrimarySoundBuffer; /* 0x005c52ec */
short          g_3_anPanTable[512]; /* 0x005c4ee8 */
/* Kept in dspv.cpp's storage in retail. */
extern int g_nVoicesReserved; /* 0x005c574c */
/* The host CRT's malloc takes size_t, which is not unsigned int on every
 * modern target; keep one definition so the globals audit sees one range. */
#define IX_MALLOC_HOOK malloc
unsigned short g_nMasterVolume = 0xffff; /* 0x004a0c14 */
void *(__cdecl *g_pIxMalloc)(unsigned int) = IX_MALLOC_HOOK; /* 0x004a0c18 */
void (__cdecl *g_pIxFree)(void *) = free; /* 0x004a0c1c */
 
/* Function start: 0x489990 */   /* source line 62 */
int ix_dsp_init(void)
{
    if ((g_5_dwSoundOptions & 1) == 0) {
        g_nVoiceCapacity = 32;
        g_3_nStreamCount = 2;
        g_3_dwMixWriteOffset = 0;
        InitializeCriticalSection(&g_7_csMixer);
        g_2_hMixerRouseEvent = CreateEventA(0, TRUE, FALSE, 0);
        ix_dsp_build_pan_tables();
        g_hMixerTask = CreateThread(
            0, 0x1000, ix_mixer_thread_proc, 0, 0,
            &g_1_dwMixWorkerId);
        if (g_hMixerTask == 0) {
            ix_log_printf("Fatal [%s - %d]:\n", IX_DSP_FILE, 62);
            ix_log_printf("Failed to start mixer");
            exit(-1);
        }
        g_5_dwSoundOptions |= 1;
    }
    return 0;
}
 
/* Function start: 0x489A4F */
void ix_dsp_shutdown(void)
{
    if ((g_5_dwSoundOptions & 1) != 0) {
        if ((g_5_dwSoundOptions & 4) != 0) {
            g_5_dwSoundOptions &= ~4U;
            SetEvent(g_2_hMixerRouseEvent);
            WaitForSingleObject(g_hMixerTask, INFINITE);
        }
        if (g_1_pDirectSound != 0) {
            g_1_pDirectSound->Release();
            g_1_pDirectSound = 0;
        }
        DeleteCriticalSection(&g_7_csMixer);
        CloseHandle(g_2_hMixerRouseEvent);
        g_5_dwSoundOptions &= 0x7ffffffe;
    }
}
 
/* Function start: 0x489AE2 */
void ix_dsp_configure(int option, void *value)
{
    switch (option) {
    case 0:
        g_4_hDspWnd = (HWND)value;
        break;
    case 1:
        g_1_pDirectSound = (LPDIRECTSOUND)value;
        break;
    case 2:
        if ((g_5_dwSoundOptions & 1) != 0)
            SetEvent(g_2_hMixerRouseEvent);
        break;
    case 3:
        if (value != 0)
            g_5_dwSoundOptions |= 0x10;
        else
            g_5_dwSoundOptions &= ~0x10U;
        break;
    case 4:
        g_pIxMalloc = (void *(__cdecl *)(unsigned int))value;
        break;
    case 5:
        g_pIxFree = (void (__cdecl *)(void *))value;
        break;
    }
}
 
/* Function start: 0x489BA5 */
BOOL CALLBACK ix_dsp_open_driver(LPGUID guid, LPSTR description,
                                 LPSTR module, LPVOID context)
{
    HRESULT result;
 
    if (g_1_pDirectSound != 0) {
        g_1_pDirectSound->Release();
        g_1_pDirectSound = 0;
    }
    result = DirectSoundCreate(guid, &g_1_pDirectSound, 0);
    if (result == DS_OK) {
        result = g_1_pDirectSound->SetCooperativeLevel(
            g_4_hDspWnd,
            (g_5_dwSoundOptions & 0x10) == 0
                ? DSSCL_WRITEPRIMARY : DSSCL_EXCLUSIVE);
        if (result == DS_OK) {
            ix_log_printf("sound driver: %s [%s]\n", description, module);
            return FALSE;
        }
        if (g_1_pDirectSound != 0) {
            g_1_pDirectSound->Release();
            g_1_pDirectSound = 0;
        }
    }
    return TRUE;
}
 
/* Function start: 0x489C7D */
unsigned int ix_dsp_get_tick(void)
{
    return g_6_dwDsoundTick;
}
 
/* Function start: 0x489C92 */
unsigned int ix_dsp_get_flags(void)
{
    return g_5_dwSoundOptions;
}
 
/* Function start: 0x489CA7 */
void ix_dsp_set_config_bit1(int enabled)
{
    if (enabled != 0)
        g_5_dwSoundOptions |= 2;
    else
        g_5_dwSoundOptions &= ~2U;
}
 
/* Function start: 0x489CD4 */
void ix_dsp_set_config_bit3(int enabled)
{
    if (enabled != 0)
        g_5_dwSoundOptions |= 8;
    else
        g_5_dwSoundOptions &= ~8U;
}
 
/* Function start: 0x489D01 */
int ix_dsp_get_voice_count(void)
{
    return g_nVoiceCapacity;
}
 
/* Function start: 0x489D16 */   /* source line(s) 176: can't change voice count while voices are in use */
void ix_dsp_set_voice_count(int voiceCount)
{
    if (g_nVoicesReserved != 0 ||
        g_nStreamsTaken != 0) {
        ix_log_printf("Warning [%s - %d]:\n", IX_DSP_FILE, 176);
        ix_log_printf("can't change voice count while voices are in use");
        return;
    }
    if (voiceCount >= 0)
        g_nVoiceCapacity = voiceCount < 32 ? voiceCount : 32;
    else
        g_nVoiceCapacity = 0;
    return;
}
 
/* Function start: 0x489D98 */
int ix_dsp_get_stream_count(void)
{
    return g_3_nStreamCount;
}
 
/* Function start: 0x489DAD */   /* source line(s) 187: can't change stream count while voices are in use */
void ix_dsp_set_stream_count(int streamCount)
{
    if (g_nVoicesReserved != 0 ||
        g_nStreamsTaken != 0) {
        ix_log_printf("Warning [%s - %d]:\n", IX_DSP_FILE, 187);
        ix_log_printf("can't change stream count while voices are in use");
        return;
    }
    if (streamCount >= 0)
        g_3_nStreamCount = streamCount < 2 ? streamCount : 2;
    else
        g_3_nStreamCount = 0;
    return;
}
 
/* Function start: 0x489E2F */
unsigned short ix_dsp_get_master_volume(void)
{
    return g_nMasterVolume;
}
 
/* Function start: 0x489E45 */
void ix_dsp_set_master_volume(unsigned short volume)
{
    int voice;
 
    if ((volume & 0xffff) >= 0) {
        g_nMasterVolume = (unsigned short)(
            (volume & 0xffff) < 0xffff ? (volume & 0xffff) : 0xffff);
    } else {
        g_nMasterVolume = 0;
    }
    for (voice = 0; voice < g_nVoiceCapacity; voice++) {
        if ((g_2_voices[voice].flags & IX_VOICE_ACTIVE) != 0)
            ix_dspv_recalc_mix(voice);
    }
}
 
/* Function start: 0x489ED2 */
void ix_dsp_build_pan_tables(void)
{
    short step;
    short leftAmp;
    short offset;
    short entry;
    short right;
 
    step = 0x3ff;
    leftAmp = 0x7fff;
    for (entry = 0; entry < 0x40; entry++) {
        offset = (short)(0x20 - entry);
        right = (short)(offset * step);
        g_3_anPanTable[entry * 2] = leftAmp;
        g_3_anPanTable[entry * 2 + 1] = right;
        g_3_anPanTable[0x100 + entry * 2] =
            (short)(leftAmp * -1);
        g_3_anPanTable[0x100 + entry * 2 + 1] =
            (short)(right * -1);
    }
    right = (short)0x8001;
    for (entry = 0x40; entry < 0x80; entry++) {
        offset = (short)(0x60 - entry);
        leftAmp = (short)(offset * step);
        g_3_anPanTable[entry * 2] = leftAmp;
        g_3_anPanTable[entry * 2 + 1] = right;
        g_3_anPanTable[0x100 + entry * 2] =
            (short)(leftAmp * -1);
        g_3_anPanTable[0x100 + entry * 2 + 1] =
            (short)(right * -1);
    }
}
 
/* Function start: 0x48A017 */
const char *ix_dsp_result_to_text(int result)
{
    switch (result) {
    case DS_OK:
        return "The function succeeded.";
    case DSERR_ALLOCATED:
        return "The function failed because resources (such as a priority level) were already in use by another caller.";
    case DSERR_ALREADYINITIALIZED:
        return "This object is already initialized.";
    case DSERR_BADFORMAT:
        return "The specified wave format is not supported.";
    case DSERR_BUFFERLOST:
        return "The buffer memory has been lost and must be restored.";
    case DSERR_CONTROLUNAVAIL:
        return "The control (volume, pan, and so forth) requested by the caller is not available.";
    case DSERR_INVALIDCALL:
        return "This function is not valid for the current state of this object";
    case DSERR_INVALIDPARAM:
        return "An invalid parameter was passed to the returning function.";
    case DSERR_NOAGGREGATION:
        return "This object does not support aggregation.";
    case DSERR_NODRIVER:
        return "No sound driver is available for use.";
    case DSERR_OUTOFMEMORY:
        return "The DirectSound subsystem couldn't allocate sufficient memory to complete the caller's request.";
    case DSERR_PRIOLEVELNEEDED:
        return "The caller does not have the priority level required for the function to succeed.";
    case E_NOINTERFACE:
        return "The requested COM interface is not available.";
    default:
        return "Unknow dsound error!";
    }
}
 
/* Function start: 0x48A1A3 */
void *ix_dsp_alloc(unsigned int bytes)
{
    return g_pIxMalloc(bytes);
}
 
/* Function start: 0x48A1C0 */
#pragma function(memcpy)
void *ix_dsp_copy(void *destination, const void *source, unsigned int bytes)
{
    return memcpy(destination, source, bytes);
}
 
/* Function start: 0x48A1E4 */
void ix_dsp_free(void *memory)
{
    g_pIxFree(memory);
}