129 lines
4.5 KiB
C
129 lines
4.5 KiB
C
// winmm.c - Win32 multimedia: waveform audio, timer
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// Stubs only; no audio hardware access at this stage.
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#include <stdint.h>
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#include <stddef.h>
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// ---------------------------------------------------------------------------
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// Types
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// ---------------------------------------------------------------------------
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typedef unsigned int MMRESULT;
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typedef void* HWAVEOUT;
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#define MMSYSERR_NOERROR 0
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#define MMSYSERR_NOTSUPPORTED 8
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#define WAVERR_STILLPLAYING 33
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// WAVEFORMATEX - standard PCM audio format descriptor.
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typedef struct {
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unsigned short wFormatTag;
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unsigned short nChannels;
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unsigned int nSamplesPerSec;
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unsigned int nAvgBytesPerSec;
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unsigned short nBlockAlign;
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unsigned short wBitsPerSample;
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unsigned short cbSize;
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} WAVEFORMATEX;
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// WAVEHDR - buffer header submitted to waveOutWrite.
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typedef struct _WAVEHDR {
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char* lpData;
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unsigned int dwBufferLength;
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unsigned int dwBytesRecorded;
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uintptr_t dwUser;
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unsigned int dwFlags;
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unsigned int dwLoops;
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struct _WAVEHDR* lpNext;
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uintptr_t reserved;
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} WAVEHDR;
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// MMTIME - used by waveOutGetPosition.
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typedef struct {
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unsigned int wType;
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union {
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unsigned int ms;
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unsigned int sample;
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unsigned int cb;
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unsigned int ticks;
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} u;
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} MMTIME;
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// ---------------------------------------------------------------------------
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// Timer
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// ---------------------------------------------------------------------------
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// timeGetTime is the lightweight alternative to GetTickCount; both return
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// milliseconds since system start. We forward to the kernel tick counter.
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extern uint64_t SysGetTick(void);
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__declspec(dllexport) unsigned long timeGetTime(void) {
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return (unsigned long)SysGetTick();
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}
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// ---------------------------------------------------------------------------
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// Waveform audio (stubs - no audio hardware at this stage)
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// ---------------------------------------------------------------------------
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__declspec(dllexport) MMRESULT waveOutOpen(HWAVEOUT* phwo, unsigned int deviceId,
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const WAVEFORMATEX* fmt, uintptr_t callback,
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uintptr_t callbackInstance, unsigned long flags) {
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(void)deviceId; (void)fmt; (void)callback; (void)callbackInstance; (void)flags;
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if (phwo) *phwo = (void*)0;
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return MMSYSERR_NOTSUPPORTED;
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}
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__declspec(dllexport) MMRESULT waveOutClose(HWAVEOUT hwo) {
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(void)hwo; return MMSYSERR_NOERROR;
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}
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__declspec(dllexport) MMRESULT waveOutPrepareHeader(HWAVEOUT hwo, WAVEHDR* hdr,
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unsigned int size) {
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(void)hwo; (void)hdr; (void)size; return MMSYSERR_NOERROR;
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}
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__declspec(dllexport) MMRESULT waveOutUnprepareHeader(HWAVEOUT hwo, WAVEHDR* hdr,
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unsigned int size) {
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(void)hwo; (void)hdr; (void)size; return MMSYSERR_NOERROR;
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}
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__declspec(dllexport) MMRESULT waveOutWrite(HWAVEOUT hwo, WAVEHDR* hdr, unsigned int size) {
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(void)hwo; (void)hdr; (void)size; return MMSYSERR_NOTSUPPORTED;
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}
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__declspec(dllexport) MMRESULT waveOutPause(HWAVEOUT hwo) {
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(void)hwo; return MMSYSERR_NOERROR;
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}
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__declspec(dllexport) MMRESULT waveOutRestart(HWAVEOUT hwo) {
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(void)hwo; return MMSYSERR_NOERROR;
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}
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__declspec(dllexport) MMRESULT waveOutReset(HWAVEOUT hwo) {
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(void)hwo; return MMSYSERR_NOERROR;
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}
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__declspec(dllexport) MMRESULT waveOutSetVolume(HWAVEOUT hwo, unsigned long volume) {
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(void)hwo; (void)volume; return MMSYSERR_NOTSUPPORTED;
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}
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__declspec(dllexport) MMRESULT waveOutGetPosition(HWAVEOUT hwo, MMTIME* mmt,
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unsigned int size) {
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(void)hwo; (void)size;
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if (mmt) { mmt->wType = 0; mmt->u.ms = 0; }
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return MMSYSERR_NOERROR;
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}
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// ---------------------------------------------------------------------------
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// Timer resolution control
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// No hardware timer reprogramming at this stage; pretend success so callers
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// that wrap their audio/game loop in timeBeginPeriod(1) don't bail out.
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// ---------------------------------------------------------------------------
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__declspec(dllexport) MMRESULT timeBeginPeriod(unsigned int uPeriod) {
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(void)uPeriod;
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return MMSYSERR_NOERROR;
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}
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__declspec(dllexport) MMRESULT timeEndPeriod(unsigned int uPeriod) {
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(void)uPeriod;
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return MMSYSERR_NOERROR;
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}
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