/*

SDL - Simple DirectMedia Layer

Copyright (C) 1997, 1998, 1999, 2000, 2001 Sam Lantinga

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

modify it under the terms of the GNU Library General Public

License as published by the Free Software Foundation; either

version 2 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

Library General Public License for more details.

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

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

Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA

Sam Lantinga

slouken@devolution.com

*/

#ifdef SAVE_RCSID

static char rcsid =

"@(#) $Id$";

#endif

/* Allow access to a raw mixing buffer */

#include <stdio.h>

#include <stdlib.h>

#include <windows.h>

#include <mmsystem.h>

#include "SDL_audio.h"

#include "SDL_mutex.h"

#include "SDL_timer.h"

#include "SDL_audio_c.h"

#include "SDL_dibaudio.h"

/* 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)

{

free(device->hidden);

free(device);

}

static SDL_AudioDevice *Audio_CreateDevice(int devindex)

{

SDL_AudioDevice *this;

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

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

if ( this ) {

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

this->hidden = (struct SDL_PrivateAudioData *)

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

}

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

SDL_OutOfMemory();

if ( this ) {

free(this);

}

return(0);

}

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 */

ReleaseSemaphore(audio_sem, 1, NULL);

}

static void SetMMerror(char *function, MMRESULT code)

{

int len;

char errbuf[MAXERRORLENGTH];

sprintf(errbuf, "%s: ", function);

len = strlen(errbuf);

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

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 */

WaitForSingleObject(audio_sem, INFINITE);

}

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 ) {

CloseHandle(audio_sem);

}

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 ) {

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 */

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 */

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

if ( audio_sem == NULL ) {

SDL_SetError("Couldn't create semaphore");

return(-1);

}

/* Create the sound buffers */

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

if ( mixbuf == NULL ) {

SDL_SetError("Out of memory");

return(-1);

}

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

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);

}