static int
DSOUND_OpenDevice(_THIS, void *handle, const char *devname, int iscapture)
{
HRESULT result;
SDL_bool valid_format = SDL_FALSE;
SDL_bool tried_format = SDL_FALSE;
SDL_AudioFormat test_format = SDL_FirstAudioFormat(this->spec.format);
LPGUID guid = (LPGUID) handle;
/* Initialize all variables that we clean on shutdown */
this->hidden = (struct SDL_PrivateAudioData *)
SDL_malloc((sizeof *this->hidden));
if (this->hidden == NULL) {
return SDL_OutOfMemory();
}
SDL_memset(this->hidden, 0, (sizeof *this->hidden));
/* Open the audio device */
result = pDirectSoundCreate8(guid, &this->hidden->sound, NULL);
if (result != DS_OK) {
DSOUND_CloseDevice(this);
return SetDSerror("DirectSoundCreate", result);
}
while ((!valid_format) && (test_format)) {
switch (test_format) {
case AUDIO_U8:
case AUDIO_S16:
case AUDIO_S32:
case AUDIO_F32:
tried_format = SDL_TRUE;
this->spec.format = test_format;
this->hidden->num_buffers = CreateSecondary(this, NULL);
if (this->hidden->num_buffers > 0) {
valid_format = SDL_TRUE;
}
break;
}
test_format = SDL_NextAudioFormat();
}
if (!valid_format) {
DSOUND_CloseDevice(this);
if (tried_format) {
return -1; /* CreateSecondary() should have called SDL_SetError(). */
}
return SDL_SetError("DirectSound: Unsupported audio format");
}
/* The buffer will auto-start playing in DSOUND_WaitDevice() */
this->hidden->mixlen = this->spec.size;
return 0; /* good to go. */
}
static int
DSOUND_OpenDevice(_THIS, const char *devname, int iscapture)
{
HRESULT result;
WAVEFORMATEX waveformat;
int valid_format = 0;
SDL_AudioFormat test_format = SDL_FirstAudioFormat(this->spec.format);
FindDevGUIDData devguid;
LPGUID guid = NULL;
if (devname != NULL) {
devguid.found = 0;
devguid.devname = devname;
if (iscapture)
pDirectSoundCaptureEnumerateW(FindDevGUID, &devguid);
else
pDirectSoundEnumerateW(FindDevGUID, &devguid);
if (!devguid.found) {
SDL_SetError("DirectSound: Requested device not found");
return 0;
}
guid = &devguid.guid;
}
/* Initialize all variables that we clean on shutdown */
this->hidden = (struct SDL_PrivateAudioData *)
SDL_malloc((sizeof *this->hidden));
if (this->hidden == NULL) {
SDL_OutOfMemory();
return 0;
}
SDL_memset(this->hidden, 0, (sizeof *this->hidden));
while ((!valid_format) && (test_format)) {
switch (test_format) {
case AUDIO_U8:
case AUDIO_S16:
case AUDIO_S32:
this->spec.format = test_format;
valid_format = 1;
break;
}
test_format = SDL_NextAudioFormat();
}
if (!valid_format) {
DSOUND_CloseDevice(this);
SDL_SetError("DirectSound: Unsupported audio format");
return 0;
}
SDL_memset(&waveformat, 0, sizeof(waveformat));
waveformat.wFormatTag = WAVE_FORMAT_PCM;
waveformat.wBitsPerSample = SDL_AUDIO_BITSIZE(this->spec.format);
waveformat.nChannels = this->spec.channels;
waveformat.nSamplesPerSec = this->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(&this->spec);
/* Open the audio device */
result = pDirectSoundCreate8(guid, &this->hidden->sound, NULL);
if (result != DS_OK) {
DSOUND_CloseDevice(this);
SetDSerror("DirectSoundCreate", result);
return 0;
}
/* Create the audio buffer to which we write */
this->hidden->num_buffers = CreateSecondary(this, NULL, &waveformat);
if (this->hidden->num_buffers < 0) {
DSOUND_CloseDevice(this);
return 0;
}
/* The buffer will auto-start playing in DSOUND_WaitDevice() */
this->hidden->mixlen = this->spec.size;
return 1; /* good to go. */
}
