SDL_dibaudio.c
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/*
SDL - Simple DirectMedia Layer
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Copyright (C) 1997-2006 Sam Lantinga
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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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
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Lesser General Public License for more details.
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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
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Sam Lantinga
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slouken@libsdl.org
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*/
/* Allow access to a raw mixing buffer */
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#include "SDL_windows.h"
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#include <mmsystem.h>
#include "SDL_timer.h"
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#include "SDL_audio.h"
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#include "../SDL_audio_c.h"
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#include "SDL_dibaudio.h"
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#if defined(_WIN32_WCE) && (_WIN32_WCE < 300)
#include "win_ce_semaphore.h"
#endif
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/* 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)
{
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SDL_free(device->hidden);
SDL_free(device);
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}
static SDL_AudioDevice *Audio_CreateDevice(int devindex)
{
SDL_AudioDevice *this;
/* Initialize all variables that we clean on shutdown */
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this = (SDL_AudioDevice *)SDL_malloc(sizeof(SDL_AudioDevice));
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if ( this ) {
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SDL_memset(this, 0, (sizeof *this));
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this->hidden = (struct SDL_PrivateAudioData *)
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SDL_malloc((sizeof *this->hidden));
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}
if ( (this == NULL) || (this->hidden == NULL) ) {
SDL_OutOfMemory();
if ( this ) {
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SDL_free(this);
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}
return(0);
}
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SDL_memset(this->hidden, 0, (sizeof *this->hidden));
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/* 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 */
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#if defined(_WIN32_WCE) && (_WIN32_WCE < 300)
ReleaseSemaphoreCE(audio_sem, 1, NULL);
#else
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ReleaseSemaphore(audio_sem, 1, NULL);
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}
static void SetMMerror(char *function, MMRESULT code)
{
int len;
char errbuf[MAXERRORLENGTH];
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#ifdef _WIN32_WCE
wchar_t werrbuf[MAXERRORLENGTH];
#endif
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SDL_snprintf(errbuf, SDL_arraysize(errbuf), "%s: ", function);
len = SDL_strlen(errbuf);
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#ifdef _WIN32_WCE
/* UNICODE version */
waveOutGetErrorText(code, werrbuf, MAXERRORLENGTH-len);
WideCharToMultiByte(CP_ACP,0,werrbuf,-1,errbuf+len,MAXERRORLENGTH-len,NULL,NULL);
#else
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waveOutGetErrorText(code, errbuf+len, MAXERRORLENGTH-len);
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#endif
SDL_SetError("%s",errbuf);
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}
/* 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 */
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#if defined(_WIN32_WCE) && (_WIN32_WCE < 300)
WaitForSemaphoreCE(audio_sem, INFINITE);
#else
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WaitForSingleObject(audio_sem, INFINITE);
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}
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 ) {
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#if defined(_WIN32_WCE) && (_WIN32_WCE < 300)
CloseSynchHandle(audio_sem);
#else
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CloseHandle(audio_sem);
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}
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 ) {
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SDL_free(mixbuf);
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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 */
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SDL_memset(&waveformat, 0, sizeof(waveformat));
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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 */
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#if defined(_WIN32_WCE) && (_WIN32_WCE < 300)
audio_sem = CreateSemaphoreCE(NULL, NUM_BUFFERS-1, NUM_BUFFERS, NULL);
#else
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audio_sem = CreateSemaphore(NULL, NUM_BUFFERS-1, NUM_BUFFERS, NULL);
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if ( audio_sem == NULL ) {
SDL_SetError("Couldn't create semaphore");
return(-1);
}
/* Create the sound buffers */
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mixbuf = (Uint8 *)SDL_malloc(NUM_BUFFERS*spec->size);
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if ( mixbuf == NULL ) {
SDL_SetError("Out of memory");
return(-1);
}
for ( i = 0; i < NUM_BUFFERS; ++i ) {
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SDL_memset(&wavebuf[i], 0, sizeof(wavebuf[i]));
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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);
}