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/* $Id$ */

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/** @file win32_s.cpp Handling of sound for Windows. */

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#include "../stdafx.h"

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#include "../openttd.h"

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#include "../driver.h"

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#include "../mixer.h"

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#include "../core/alloc_func.hpp"

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#include "win32_s.h"

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#include <windows.h>

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#include <mmsystem.h>

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static FSoundDriver_Win32 iFSoundDriver_Win32;

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static HWAVEOUT _waveout;

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static WAVEHDR _wave_hdr[2];

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static int _bufsize;

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static void PrepareHeader(WAVEHDR *hdr)

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{

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	hdr->dwBufferLength = _bufsize * 4;

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	hdr->dwFlags = 0;

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	hdr->lpData = MallocT<char>(_bufsize * 4);

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	if (hdr->lpData == NULL ||

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			waveOutPrepareHeader(_waveout, hdr, sizeof(WAVEHDR)) != MMSYSERR_NOERROR)

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}

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static void FillHeaders()

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{

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	WAVEHDR *hdr;

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	for (hdr = _wave_hdr; hdr != endof(_wave_hdr); hdr++) {

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		if (!(hdr->dwFlags & WHDR_INQUEUE)) {

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			MxMixSamples(hdr->lpData, hdr->dwBufferLength / 4);

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			if (waveOutWrite(_waveout, hdr, sizeof(WAVEHDR)) != MMSYSERR_NOERROR)

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		}

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	}

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}

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static void CALLBACK waveOutProc(HWAVEOUT hwo, UINT uMsg, DWORD_PTR dwInstance,

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	DWORD dwParam1, DWORD dwParam2)

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{

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	switch (uMsg) {

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		case WOM_DONE:

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			if (_waveout != NULL) FillHeaders();

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			break;

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		default: break;

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	}

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}

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const char *SoundDriver_Win32::Start(const char* const* parm)

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{

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	WAVEFORMATEX wfex;

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	wfex.wFormatTag = WAVE_FORMAT_PCM;

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	wfex.nChannels = 2;

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	wfex.wBitsPerSample = 16;

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	wfex.nSamplesPerSec = GetDriverParamInt(parm, "hz", 11025);

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	wfex.nBlockAlign = (wfex.nChannels * wfex.wBitsPerSample) / 8;

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	wfex.nAvgBytesPerSec = wfex.nSamplesPerSec * wfex.nBlockAlign;

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	_bufsize = GetDriverParamInt(parm, "bufsize", (GB(GetVersion(), 0, 8) > 5) ? 2048 : 1024);

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	if (waveOutOpen(&_waveout, WAVE_MAPPER, &wfex, (DWORD_PTR)&waveOutProc, 0, CALLBACK_FUNCTION) != MMSYSERR_NOERROR)

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		return "waveOutOpen failed";

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	PrepareHeader(&_wave_hdr[0]);

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	PrepareHeader(&_wave_hdr[1]);

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	FillHeaders();

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	return NULL;

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}

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void SoundDriver_Win32::Stop()

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{

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	HWAVEOUT waveout = _waveout;

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	_waveout = NULL;

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	waveOutReset(waveout);

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	waveOutUnprepareHeader(waveout, &_wave_hdr[0], sizeof(WAVEHDR));

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	waveOutUnprepareHeader(waveout, &_wave_hdr[1], sizeof(WAVEHDR));

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	waveOutClose(waveout);

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}