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SDL_dx5audio.c
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/*
SDL - Simple DirectMedia Layer
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Copyright (C) 1997-2009 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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*/
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#include "SDL_config.h"
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/* Allow access to a raw mixing buffer */
#include "SDL_timer.h"
#include "SDL_audio.h"
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#include "../SDL_audio_c.h"
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#include "SDL_dx5audio.h"
/* Define this if you want to use DirectX 6 DirectSoundNotify interface */
//#define USE_POSITION_NOTIFY
/* DirectX function pointers for audio */
HRESULT (WINAPI *DSoundCreate)(LPGUID, LPDIRECTSOUND *, LPUNKNOWN);
/* Audio driver functions */
static int DX5_OpenAudio(_THIS, SDL_AudioSpec *spec);
static void DX5_ThreadInit(_THIS);
static void DX5_WaitAudio_BusyWait(_THIS);
#ifdef USE_POSITION_NOTIFY
static void DX6_WaitAudio_EventWait(_THIS);
#endif
static void DX5_PlayAudio(_THIS);
static Uint8 *DX5_GetAudioBuf(_THIS);
static void DX5_WaitDone(_THIS);
static void DX5_CloseAudio(_THIS);
/* Audio driver bootstrap functions */
static int Audio_Available(void)
{
HINSTANCE DSoundDLL;
int dsound_ok;
/* Version check DSOUND.DLL (Is DirectX okay?) */
dsound_ok = 0;
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DSoundDLL = LoadLibrary(TEXT("DSOUND.DLL"));
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if ( DSoundDLL != NULL ) {
/* We just use basic DirectSound, we're okay */
/* Yay! */
/* Unfortunately, the sound drivers on NT have
higher latencies than the audio buffers used
by many SDL applications, so there are gaps
in the audio - it sounds terrible. Punt for now.
*/
OSVERSIONINFO ver;
ver.dwOSVersionInfoSize = sizeof (OSVERSIONINFO);
GetVersionEx(&ver);
switch (ver.dwPlatformId) {
case VER_PLATFORM_WIN32_NT:
if ( ver.dwMajorVersion > 4 ) {
/* Win2K */
dsound_ok = 1;
} else {
/* WinNT */
dsound_ok = 0;
}
break;
default:
/* Win95 or Win98 */
dsound_ok = 1;
break;
}
/* Now check for DirectX 5 or better - otherwise
* we will fail later in DX5_OpenAudio without a chance
* to fall back to the DIB driver. */
if (dsound_ok) {
/* DirectSoundCaptureCreate was added in DX5 */
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if (!GetProcAddress(DSoundDLL, TEXT("DirectSoundCaptureCreate")))
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dsound_ok = 0;
}
/* Clean up.. */
FreeLibrary(DSoundDLL);
}
return(dsound_ok);
}
/* Functions for loading the DirectX functions dynamically */
static HINSTANCE DSoundDLL = NULL;
static void DX5_Unload(void)
{
if ( DSoundDLL != NULL ) {
FreeLibrary(DSoundDLL);
DSoundCreate = NULL;
DSoundDLL = NULL;
}
}
static int DX5_Load(void)
{
int status;
DX5_Unload();
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DSoundDLL = LoadLibrary(TEXT("DSOUND.DLL"));
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if ( DSoundDLL != NULL ) {
DSoundCreate = (void *)GetProcAddress(DSoundDLL,
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TEXT("DirectSoundCreate"));
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}
if ( DSoundDLL && DSoundCreate ) {
status = 0;
} else {
DX5_Unload();
status = -1;
}
return status;
}
static void Audio_DeleteDevice(SDL_AudioDevice *device)
{
DX5_Unload();
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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;
/* Load DirectX */
if ( DX5_Load() < 0 ) {
return(NULL);
}
/* 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 = DX5_OpenAudio;
this->ThreadInit = DX5_ThreadInit;
this->WaitAudio = DX5_WaitAudio_BusyWait;
this->PlayAudio = DX5_PlayAudio;
this->GetAudioBuf = DX5_GetAudioBuf;
this->WaitDone = DX5_WaitDone;
this->CloseAudio = DX5_CloseAudio;
this->free = Audio_DeleteDevice;
return this;
}
AudioBootStrap DSOUND_bootstrap = {
"dsound", "Win95/98/2000 DirectSound",
Audio_Available, Audio_CreateDevice
};
static void SetDSerror(const char *function, int code)
{
static const char *error;
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static char errbuf[1024];
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errbuf[0] = 0;
switch (code) {
case E_NOINTERFACE:
error =
"Unsupported interface\n-- Is DirectX 5.0 or later installed?";
break;
case DSERR_ALLOCATED:
error = "Audio device in use";
break;
case DSERR_BADFORMAT:
error = "Unsupported audio format";
break;
case DSERR_BUFFERLOST:
error = "Mixing buffer was lost";
break;
case DSERR_CONTROLUNAVAIL:
error = "Control requested is not available";
break;
case DSERR_INVALIDCALL:
error = "Invalid call for the current state";
break;
case DSERR_INVALIDPARAM:
error = "Invalid parameter";
break;
case DSERR_NODRIVER:
error = "No audio device found";
break;
case DSERR_OUTOFMEMORY:
error = "Out of memory";
break;
case DSERR_PRIOLEVELNEEDED:
error = "Caller doesn't have priority";
break;
case DSERR_UNSUPPORTED:
error = "Function not supported";
break;
default:
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SDL_snprintf(errbuf, SDL_arraysize(errbuf),
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"%s: Unknown DirectSound error: 0x%x",
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function, code);
break;
}
if ( ! errbuf[0] ) {
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SDL_snprintf(errbuf, SDL_arraysize(errbuf), "%s: %s", function, error);
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}
SDL_SetError("%s", errbuf);
return;
}
/* DirectSound needs to be associated with a window */
static HWND mainwin = NULL;
/* */
void DX5_SoundFocus(HWND hwnd)
{
mainwin = hwnd;
}
static void DX5_ThreadInit(_THIS)
{
SetThreadPriority(GetCurrentThread(), THREAD_PRIORITY_HIGHEST);
}
static void DX5_WaitAudio_BusyWait(_THIS)
{
DWORD status;
DWORD cursor, junk;
HRESULT result;
/* Semi-busy wait, since we have no way of getting play notification
on a primary mixing buffer located in hardware (DirectX 5.0)
*/
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result = IDirectSoundBuffer_GetCurrentPosition(mixbuf, &junk, &cursor);
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if ( result != DS_OK ) {
if ( result == DSERR_BUFFERLOST ) {
IDirectSoundBuffer_Restore(mixbuf);
}
#ifdef DEBUG_SOUND
SetDSerror("DirectSound GetCurrentPosition", result);
#endif
return;
}
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while ( (cursor/mixlen) == lastchunk ) {
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/* FIXME: find out how much time is left and sleep that long */
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SDL_Delay(1);
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/* Try to restore a lost sound buffer */
IDirectSoundBuffer_GetStatus(mixbuf, &status);
if ( (status&DSBSTATUS_BUFFERLOST) ) {
IDirectSoundBuffer_Restore(mixbuf);
IDirectSoundBuffer_GetStatus(mixbuf, &status);
if ( (status&DSBSTATUS_BUFFERLOST) ) {
break;
}
}
if ( ! (status&DSBSTATUS_PLAYING) ) {
result = IDirectSoundBuffer_Play(mixbuf, 0, 0, DSBPLAY_LOOPING);
if ( result == DS_OK ) {
continue;
}
#ifdef DEBUG_SOUND
SetDSerror("DirectSound Play", result);
#endif
return;
}
/* Find out where we are playing */
result = IDirectSoundBuffer_GetCurrentPosition(mixbuf,
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&junk, &cursor);
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if ( result != DS_OK ) {
SetDSerror("DirectSound GetCurrentPosition", result);
return;
}
}
}
#ifdef USE_POSITION_NOTIFY
static void DX6_WaitAudio_EventWait(_THIS)
{
DWORD status;
HRESULT result;
/* Try to restore a lost sound buffer */
IDirectSoundBuffer_GetStatus(mixbuf, &status);
if ( (status&DSBSTATUS_BUFFERLOST) ) {
IDirectSoundBuffer_Restore(mixbuf);
IDirectSoundBuffer_GetStatus(mixbuf, &status);
if ( (status&DSBSTATUS_BUFFERLOST) ) {
return;
}
}
if ( ! (status&DSBSTATUS_PLAYING) ) {
result = IDirectSoundBuffer_Play(mixbuf, 0, 0, DSBPLAY_LOOPING);
if ( result != DS_OK ) {
#ifdef DEBUG_SOUND
SetDSerror("DirectSound Play", result);
#endif
return;
}
}
WaitForSingleObject(audio_event, INFINITE);
}
#endif /* USE_POSITION_NOTIFY */
static void DX5_PlayAudio(_THIS)
{
/* Unlock the buffer, allowing it to play */
if ( locked_buf ) {
IDirectSoundBuffer_Unlock(mixbuf, locked_buf, mixlen, NULL, 0);
}
}
static Uint8 *DX5_GetAudioBuf(_THIS)
{
DWORD cursor, junk;
HRESULT result;
DWORD rawlen;
/* Figure out which blocks to fill next */
locked_buf = NULL;
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result = IDirectSoundBuffer_GetCurrentPosition(mixbuf, &junk, &cursor);
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if ( result == DSERR_BUFFERLOST ) {
IDirectSoundBuffer_Restore(mixbuf);
result = IDirectSoundBuffer_GetCurrentPosition(mixbuf,
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&junk, &cursor);
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}
if ( result != DS_OK ) {
SetDSerror("DirectSound GetCurrentPosition", result);
return(NULL);
}
cursor /= mixlen;
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#ifdef DEBUG_SOUND
/* Detect audio dropouts */
{ DWORD spot = cursor;
if ( spot < lastchunk ) {
spot += NUM_BUFFERS;
}
if ( spot > lastchunk+1 ) {
fprintf(stderr, "Audio dropout, missed %d fragments\n",
(spot - (lastchunk+1)));
}
}
#endif
lastchunk = cursor;
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cursor = (cursor+1)%NUM_BUFFERS;
cursor *= mixlen;
/* Lock the audio buffer */
result = IDirectSoundBuffer_Lock(mixbuf, cursor, mixlen,
(LPVOID *)&locked_buf, &rawlen, NULL, &junk, 0);
if ( result == DSERR_BUFFERLOST ) {
IDirectSoundBuffer_Restore(mixbuf);
result = IDirectSoundBuffer_Lock(mixbuf, cursor, mixlen,
(LPVOID *)&locked_buf, &rawlen, NULL, &junk, 0);
}
if ( result != DS_OK ) {
SetDSerror("DirectSound Lock", result);
return(NULL);
}
return(locked_buf);
}
static void DX5_WaitDone(_THIS)
{
Uint8 *stream;
/* Wait for the playing chunk to finish */
stream = this->GetAudioBuf(this);
if ( stream != NULL ) {
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SDL_memset(stream, silence, mixlen);
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this->PlayAudio(this);
}
this->WaitAudio(this);
/* Stop the looping sound buffer */
IDirectSoundBuffer_Stop(mixbuf);
}
static void DX5_CloseAudio(_THIS)
{
if ( sound != NULL ) {
if ( mixbuf != NULL ) {
/* Clean up the audio buffer */
IDirectSoundBuffer_Release(mixbuf);
mixbuf = NULL;
}
if ( audio_event != NULL ) {
CloseHandle(audio_event);
audio_event = NULL;
}
IDirectSound_Release(sound);
sound = NULL;
}
}
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#ifdef USE_PRIMARY_BUFFER
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/* This function tries to create a primary audio buffer, and returns the
number of audio chunks available in the created buffer.
*/
static int CreatePrimary(LPDIRECTSOUND sndObj, HWND focus,
LPDIRECTSOUNDBUFFER *sndbuf, WAVEFORMATEX *wavefmt, Uint32 chunksize)
{
HRESULT result;
DSBUFFERDESC format;
DSBCAPS caps;
int numchunks;
/* Try to set primary mixing privileges */
result = IDirectSound_SetCooperativeLevel(sndObj, focus,
DSSCL_WRITEPRIMARY);
if ( result != DS_OK ) {
#ifdef DEBUG_SOUND
SetDSerror("DirectSound SetCooperativeLevel", result);
#endif
return(-1);
}
/* Try to create the primary buffer */
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SDL_memset(&format, 0, sizeof(format));
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format.dwSize = sizeof(format);
format.dwFlags=(DSBCAPS_PRIMARYBUFFER|DSBCAPS_GETCURRENTPOSITION2);
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format.dwFlags |= DSBCAPS_STICKYFOCUS;
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#ifdef USE_POSITION_NOTIFY
format.dwFlags |= DSBCAPS_CTRLPOSITIONNOTIFY;
#endif
result = IDirectSound_CreateSoundBuffer(sndObj, &format, sndbuf, NULL);
if ( result != DS_OK ) {
#ifdef DEBUG_SOUND
SetDSerror("DirectSound CreateSoundBuffer", result);
#endif
return(-1);
}
/* Check the size of the fragment buffer */
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SDL_memset(&caps, 0, sizeof(caps));
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caps.dwSize = sizeof(caps);
result = IDirectSoundBuffer_GetCaps(*sndbuf, &caps);
if ( result != DS_OK ) {
#ifdef DEBUG_SOUND
SetDSerror("DirectSound GetCaps", result);
#endif
IDirectSoundBuffer_Release(*sndbuf);
return(-1);
}
if ( (chunksize > caps.dwBufferBytes) ||
((caps.dwBufferBytes%chunksize) != 0) ) {
/* The primary buffer size is not a multiple of 'chunksize'
-- this hopefully doesn't happen when 'chunksize' is a
power of 2.
*/
IDirectSoundBuffer_Release(*sndbuf);
SDL_SetError(
"Primary buffer size is: %d, cannot break it into chunks of %d bytes\n",
caps.dwBufferBytes, chunksize);
return(-1);
}
numchunks = (caps.dwBufferBytes/chunksize);
/* Set the primary audio format */
result = IDirectSoundBuffer_SetFormat(*sndbuf, wavefmt);
if ( result != DS_OK ) {
#ifdef DEBUG_SOUND
SetDSerror("DirectSound SetFormat", result);
#endif
IDirectSoundBuffer_Release(*sndbuf);
return(-1);
}
return(numchunks);
}
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#endif /* USE_PRIMARY_BUFFER */
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/* This function tries to create a secondary audio buffer, and returns the
number of audio chunks available in the created buffer.
*/
static int CreateSecondary(LPDIRECTSOUND sndObj, HWND focus,
LPDIRECTSOUNDBUFFER *sndbuf, WAVEFORMATEX *wavefmt, Uint32 chunksize)
{
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const int numchunks = 8;
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HRESULT result;
DSBUFFERDESC format;
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LPVOID pvAudioPtr1, pvAudioPtr2;
DWORD dwAudioBytes1, dwAudioBytes2;
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/* Try to set primary mixing privileges */
if ( focus ) {
result = IDirectSound_SetCooperativeLevel(sndObj,
focus, DSSCL_PRIORITY);
} else {
result = IDirectSound_SetCooperativeLevel(sndObj,
GetDesktopWindow(), DSSCL_NORMAL);
}
if ( result != DS_OK ) {
#ifdef DEBUG_SOUND
SetDSerror("DirectSound SetCooperativeLevel", result);
#endif
return(-1);
}
/* Try to create the secondary buffer */
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SDL_memset(&format, 0, sizeof(format));
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format.dwSize = sizeof(format);
format.dwFlags = DSBCAPS_GETCURRENTPOSITION2;
#ifdef USE_POSITION_NOTIFY
format.dwFlags |= DSBCAPS_CTRLPOSITIONNOTIFY;
#endif
if ( ! focus ) {
format.dwFlags |= DSBCAPS_GLOBALFOCUS;
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} else {
format.dwFlags |= DSBCAPS_STICKYFOCUS;
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}
format.dwBufferBytes = numchunks*chunksize;
if ( (format.dwBufferBytes < DSBSIZE_MIN) ||
(format.dwBufferBytes > DSBSIZE_MAX) ) {
SDL_SetError("Sound buffer size must be between %d and %d",
DSBSIZE_MIN/numchunks, DSBSIZE_MAX/numchunks);
return(-1);
}
format.dwReserved = 0;
format.lpwfxFormat = wavefmt;
result = IDirectSound_CreateSoundBuffer(sndObj, &format, sndbuf, NULL);
if ( result != DS_OK ) {
SetDSerror("DirectSound CreateSoundBuffer", result);
return(-1);
}
IDirectSoundBuffer_SetFormat(*sndbuf, wavefmt);
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/* Silence the initial audio buffer */
result = IDirectSoundBuffer_Lock(*sndbuf, 0, format.dwBufferBytes,
(LPVOID *)&pvAudioPtr1, &dwAudioBytes1,
(LPVOID *)&pvAudioPtr2, &dwAudioBytes2,
DSBLOCK_ENTIREBUFFER);
if ( result == DS_OK ) {
if ( wavefmt->wBitsPerSample == 8 ) {
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SDL_memset(pvAudioPtr1, 0x80, dwAudioBytes1);
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} else {
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SDL_memset(pvAudioPtr1, 0x00, dwAudioBytes1);
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}
IDirectSoundBuffer_Unlock(*sndbuf,
(LPVOID)pvAudioPtr1, dwAudioBytes1,
(LPVOID)pvAudioPtr2, dwAudioBytes2);
}
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/* We're ready to go */
return(numchunks);
}
/* This function tries to set position notify events on the mixing buffer */
#ifdef USE_POSITION_NOTIFY
static int CreateAudioEvent(_THIS)
{
LPDIRECTSOUNDNOTIFY notify;
DSBPOSITIONNOTIFY *notify_positions;
int i, retval;
HRESULT result;
/* Default to fail on exit */
retval = -1;
notify = NULL;
/* Query for the interface */
result = IDirectSoundBuffer_QueryInterface(mixbuf,
&IID_IDirectSoundNotify, (void *)¬ify);
if ( result != DS_OK ) {
goto done;
}
/* Allocate the notify structures */
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notify_positions = (DSBPOSITIONNOTIFY *)SDL_malloc(NUM_BUFFERS*
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sizeof(*notify_positions));
if ( notify_positions == NULL ) {
goto done;
}
/* Create the notify event */
audio_event = CreateEvent(NULL, FALSE, FALSE, NULL);
if ( audio_event == NULL ) {
goto done;
}
/* Set up the notify structures */
for ( i=0; i<NUM_BUFFERS; ++i ) {
notify_positions[i].dwOffset = i*mixlen;
notify_positions[i].hEventNotify = audio_event;
}
result = IDirectSoundNotify_SetNotificationPositions(notify,
NUM_BUFFERS, notify_positions);
if ( result == DS_OK ) {
retval = 0;
}
done:
if ( notify != NULL ) {
IDirectSoundNotify_Release(notify);
}
return(retval);
}
#endif /* USE_POSITION_NOTIFY */
static int DX5_OpenAudio(_THIS, SDL_AudioSpec *spec)
{
HRESULT result;
WAVEFORMATEX waveformat;
/* 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;
silence = 0x80;
waveformat.wBitsPerSample = 8;
break;
case 16:
/* Signed 16 bit audio data */
spec->format = AUDIO_S16;
silence = 0x00;
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;
/* Update the fragment size as size in bytes */
SDL_CalculateAudioSpec(spec);
/* Open the audio device */
result = DSoundCreate(NULL, &sound, NULL);
if ( result != DS_OK ) {
SetDSerror("DirectSoundCreate", result);
return(-1);
}
/* Create the audio buffer to which we write */
NUM_BUFFERS = -1;
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#ifdef USE_PRIMARY_BUFFER
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if ( mainwin ) {
NUM_BUFFERS = CreatePrimary(sound, mainwin, &mixbuf,
&waveformat, spec->size);
}
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#endif /* USE_PRIMARY_BUFFER */
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if ( NUM_BUFFERS < 0 ) {
NUM_BUFFERS = CreateSecondary(sound, mainwin, &mixbuf,
&waveformat, spec->size);
if ( NUM_BUFFERS < 0 ) {
return(-1);
}
#ifdef DEBUG_SOUND
fprintf(stderr, "Using secondary audio buffer\n");
#endif
}
#ifdef DEBUG_SOUND
else
fprintf(stderr, "Using primary audio buffer\n");
#endif
/* The buffer will auto-start playing in DX5_WaitAudio() */
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lastchunk = 0;
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mixlen = spec->size;
#ifdef USE_POSITION_NOTIFY
/* See if we can use DirectX 6 event notification */
if ( CreateAudioEvent(this) == 0 ) {
this->WaitAudio = DX6_WaitAudio_EventWait;
} else {
this->WaitAudio = DX5_WaitAudio_BusyWait;
}
#endif
return(0);
}