/*

    SDL - Simple DirectMedia Layer

    Copyright (C) 1997-2006 Sam Lantinga

    This library is free software; you can redistribute it and/or

    modify it under the terms of the GNU Lesser General Public

    License as published by the Free Software Foundation; either

    version 2.1 of the License, or (at your option) any later version.

    This library is distributed in the hope that it will be useful,

    but WITHOUT ANY WARRANTY; without even the implied warranty of

    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

    Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public

    License along with this library; if not, write to the Free Software

    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

    Sam Lantinga

    slouken@libsdl.org

*/

/* Allow access to a raw mixing buffer */

#include "SDL_windows.h"

#include <mmsystem.h>

#include "SDL_timer.h"

#include "SDL_audio.h"

#include "../SDL_audio_c.h"

#include "SDL_dibaudio.h"

#if defined(_WIN32_WCE) && (_WIN32_WCE < 300)

#include "win_ce_semaphore.h"

#endif

/* Audio driver functions */

static int DIB_OpenAudio(_THIS, SDL_AudioSpec *spec);

static void DIB_ThreadInit(_THIS);

static void DIB_WaitAudio(_THIS);

static Uint8 *DIB_GetAudioBuf(_THIS);

static void DIB_PlayAudio(_THIS);

static void DIB_WaitDone(_THIS);

static void DIB_CloseAudio(_THIS);

/* Audio driver bootstrap functions */

static int Audio_Available(void)

{

	return(1);

}

static void Audio_DeleteDevice(SDL_AudioDevice *device)

{

	SDL_free(device->hidden);

	SDL_free(device);

}

static SDL_AudioDevice *Audio_CreateDevice(int devindex)

{

	SDL_AudioDevice *this;

	/* Initialize all variables that we clean on shutdown */

	this = (SDL_AudioDevice *)SDL_malloc(sizeof(SDL_AudioDevice));

	if ( this ) {

		SDL_memset(this, 0, (sizeof *this));

		this->hidden = (struct SDL_PrivateAudioData *)

				SDL_malloc((sizeof *this->hidden));

	}

	if ( (this == NULL) || (this->hidden == NULL) ) {

		SDL_OutOfMemory();

		if ( this ) {

			SDL_free(this);

		}

		return(0);

	}

	SDL_memset(this->hidden, 0, (sizeof *this->hidden));

	/* Set the function pointers */

	this->OpenAudio = DIB_OpenAudio;

	this->ThreadInit = DIB_ThreadInit;

	this->WaitAudio = DIB_WaitAudio;

	this->PlayAudio = DIB_PlayAudio;

	this->GetAudioBuf = DIB_GetAudioBuf;

	this->WaitDone = DIB_WaitDone;

	this->CloseAudio = DIB_CloseAudio;

	this->free = Audio_DeleteDevice;

	return this;

}

AudioBootStrap WAVEOUT_bootstrap = {

	"waveout", "Win95/98/NT/2000 WaveOut",

	Audio_Available, Audio_CreateDevice

};

/* The Win32 callback for filling the WAVE device */

static void CALLBACK FillSound(HWAVEOUT hwo, UINT uMsg, DWORD dwInstance,

						DWORD dwParam1, DWORD dwParam2)

{

	SDL_AudioDevice *this = (SDL_AudioDevice *)dwInstance;

	/* Only service "buffer done playing" messages */

	if ( uMsg != WOM_DONE )

		return;

	/* Signal that we are done playing a buffer */

#if defined(_WIN32_WCE) && (_WIN32_WCE < 300)

	ReleaseSemaphoreCE(audio_sem, 1, NULL);

#else

	ReleaseSemaphore(audio_sem, 1, NULL);

#endif

}

static void SetMMerror(char *function, MMRESULT code)

{

	int len;

	char errbuf[MAXERRORLENGTH];

#ifdef _WIN32_WCE

	wchar_t werrbuf[MAXERRORLENGTH];

#endif

	SDL_snprintf(errbuf, SDL_arraysize(errbuf), "%s: ", function);

	len = SDL_strlen(errbuf);

#ifdef _WIN32_WCE

	/* UNICODE version */

	waveOutGetErrorText(code, werrbuf, MAXERRORLENGTH-len);

	WideCharToMultiByte(CP_ACP,0,werrbuf,-1,errbuf+len,MAXERRORLENGTH-len,NULL,NULL);

#else

	waveOutGetErrorText(code, errbuf+len, MAXERRORLENGTH-len);

#endif

	SDL_SetError("%s",errbuf);

}

/* Set high priority for the audio thread */

static void DIB_ThreadInit(_THIS)

{

	SetThreadPriority(GetCurrentThread(), THREAD_PRIORITY_HIGHEST);

}

void DIB_WaitAudio(_THIS)

{

	/* Wait for an audio chunk to finish */

#if defined(_WIN32_WCE) && (_WIN32_WCE < 300)

	WaitForSemaphoreCE(audio_sem, INFINITE);

#else

	WaitForSingleObject(audio_sem, INFINITE);

#endif

}

Uint8 *DIB_GetAudioBuf(_THIS)

{

        Uint8 *retval;

	retval = (Uint8 *)(wavebuf[next_buffer].lpData);

	return retval;

}

void DIB_PlayAudio(_THIS)

{

	/* Queue it up */

	waveOutWrite(sound, &wavebuf[next_buffer], sizeof(wavebuf[0]));

	next_buffer = (next_buffer+1)%NUM_BUFFERS;

}

void DIB_WaitDone(_THIS)

{

	int i, left;

	do {

		left = NUM_BUFFERS;

		for ( i=0; i<NUM_BUFFERS; ++i ) {

			if ( wavebuf[i].dwFlags & WHDR_DONE ) {

				--left;

			}

		}

		if ( left > 0 ) {

			SDL_Delay(100);

		}

	} while ( left > 0 );

}

void DIB_CloseAudio(_THIS)

{

	int i;

	/* Close up audio */

	if ( audio_sem ) {

#if defined(_WIN32_WCE) && (_WIN32_WCE < 300)

		CloseSynchHandle(audio_sem);

#else

		CloseHandle(audio_sem);

#endif

	}

	if ( sound ) {

		waveOutClose(sound);

	}

	/* Clean up mixing buffers */

	for ( i=0; i<NUM_BUFFERS; ++i ) {

		if ( wavebuf[i].dwUser != 0xFFFF ) {

			waveOutUnprepareHeader(sound, &wavebuf[i],

						sizeof(wavebuf[i]));

			wavebuf[i].dwUser = 0xFFFF;

		}

	}

	/* Free raw mixing buffer */

	if ( mixbuf != NULL ) {

		SDL_free(mixbuf);

		mixbuf = NULL;

	}

}

int DIB_OpenAudio(_THIS, SDL_AudioSpec *spec)

{

	MMRESULT result;

	int i;

	WAVEFORMATEX waveformat;

	/* Initialize the wavebuf structures for closing */

	sound = NULL;

	audio_sem = NULL;

	for ( i = 0; i < NUM_BUFFERS; ++i )

		wavebuf[i].dwUser = 0xFFFF;

	mixbuf = NULL;

	/* Set basic WAVE format parameters */

	SDL_memset(&waveformat, 0, sizeof(waveformat));

	waveformat.wFormatTag = WAVE_FORMAT_PCM;

	/* Determine the audio parameters from the AudioSpec */

	switch ( spec->format & 0xFF ) {

		case 8:

			/* Unsigned 8 bit audio data */

			spec->format = AUDIO_U8;

			waveformat.wBitsPerSample = 8;

			break;

		case 16:

			/* Signed 16 bit audio data */

			spec->format = AUDIO_S16;

			waveformat.wBitsPerSample = 16;

			break;

		default:

			SDL_SetError("Unsupported audio format");

			return(-1);

	}

	waveformat.nChannels = spec->channels;

	waveformat.nSamplesPerSec = spec->freq;

	waveformat.nBlockAlign =

		waveformat.nChannels * (waveformat.wBitsPerSample/8);

	waveformat.nAvgBytesPerSec = 

		waveformat.nSamplesPerSec * waveformat.nBlockAlign;

	/* Check the buffer size -- minimum of 1/4 second (word aligned) */

	if ( spec->samples < (spec->freq/4) )

		spec->samples = ((spec->freq/4)+3)&~3;

	/* Update the fragment size as size in bytes */

	SDL_CalculateAudioSpec(spec);

	/* Open the audio device */

	result = waveOutOpen(&sound, WAVE_MAPPER, &waveformat,

			(DWORD)FillSound, (DWORD)this, CALLBACK_FUNCTION);

	if ( result != MMSYSERR_NOERROR ) {

		SetMMerror("waveOutOpen()", result);

		return(-1);

	}

#ifdef SOUND_DEBUG

	/* Check the sound device we retrieved */

	{

		WAVEOUTCAPS caps;

		result = waveOutGetDevCaps((UINT)sound, &caps, sizeof(caps));

		if ( result != MMSYSERR_NOERROR ) {

			SetMMerror("waveOutGetDevCaps()", result);

			return(-1);

		}

		printf("Audio device: %s\n", caps.szPname);

	}

#endif

	/* Create the audio buffer semaphore */

#if defined(_WIN32_WCE) && (_WIN32_WCE < 300)

	audio_sem = CreateSemaphoreCE(NULL, NUM_BUFFERS-1, NUM_BUFFERS, NULL);

#else

	audio_sem = CreateSemaphore(NULL, NUM_BUFFERS-1, NUM_BUFFERS, NULL);

#endif

	if ( audio_sem == NULL ) {

		SDL_SetError("Couldn't create semaphore");

		return(-1);

	}

	/* Create the sound buffers */

	mixbuf = (Uint8 *)SDL_malloc(NUM_BUFFERS*spec->size);

	if ( mixbuf == NULL ) {

		SDL_SetError("Out of memory");

		return(-1);

	}

	for ( i = 0; i < NUM_BUFFERS; ++i ) {

		SDL_memset(&wavebuf[i], 0, sizeof(wavebuf[i]));

		wavebuf[i].lpData = (LPSTR) &mixbuf[i*spec->size];

		wavebuf[i].dwBufferLength = spec->size;

		wavebuf[i].dwFlags = WHDR_DONE;

		result = waveOutPrepareHeader(sound, &wavebuf[i],

							sizeof(wavebuf[i]));

		if ( result != MMSYSERR_NOERROR ) {

			SetMMerror("waveOutPrepareHeader()", result);

			return(-1);

		}

	}

	/* Ready to go! */

	next_buffer = 0;

	return(0);

}