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SDL_os2audio.c (OS2_OpenDevice): change spec->samples assignment:

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Original code assigned MCIMixSetup.ulSamplesPerSec value to it, but it
is just the freq... We now change spec->samples only either if it is 0
or we changed the frequency, by picking a default of ~46 ms at desired
frequency (code taken from SDL_audio.c:prepare_audiospec()).

With this, the crashes I have been experiencing are gone.
This commit is contained in:
Ozkan Sezer 2020-10-14 23:01:05 +03:00
parent e112b776fc
commit a3d7913c07
1 changed files with 16 additions and 2 deletions
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18
src/audio/os2/SDL_os2audio.c
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@ -268,7 +268,9 @@ static int OS2_OpenDevice(_THIS, void *handle, const char *devname,
MCI_BUFFER_PARMS stMCIBuffer;
ULONG ulRC;
ULONG ulIdx;
BOOL new_freq;
new_freq = FALSE;
SDL_zero(stMCIAmpOpen);
SDL_zero(stMCIBuffer);
@ -350,10 +352,12 @@ static int OS2_OpenDevice(_THIS, void *handle, const char *devname,
if ( this->spec.freq < 8000 )
{
this->spec.freq = 8000;
new_freq = TRUE;
}
else if ( this->spec.freq > 48000 )
{
this->spec.freq = 48000;
new_freq = TRUE;
}
// Setup mixer.
@ -377,6 +381,7 @@ static int OS2_OpenDevice(_THIS, void *handle, const char *devname,
MCI_WAIT | MCI_MIXSETUP_INIT, &pAData->stMCIMixSetup, 0 );
if ( ( ulRC != MCIERR_SUCCESS ) && ( this->spec.freq > 44100 ) )
{
new_freq = TRUE;
pAData->stMCIMixSetup.ulSamplesPerSec = 44100;
this->spec.freq = 44100;
ulRC = mciSendCommand( pAData->usDeviceId, MCI_MIXSETUP,
@ -395,13 +400,22 @@ static int OS2_OpenDevice(_THIS, void *handle, const char *devname,
return _MCIError( "MCI_MIXSETUP", ulRC );
}
this->spec.samples = pAData->stMCIMixSetup.ulSamplesPerSec;
if (this->spec.samples == 0 || new_freq == TRUE) {
/* also see SDL_audio.c:prepare_audiospec() */
/* Pick a default of ~46 ms at desired frequency */
Uint32 samples = (this->spec.freq / 1000) * 46;
Uint32 power2 = 1;
while (power2 < samples) {
power2 <<= 1;
}
this->spec.samples = power2;
}
/* Update the fragment size as size in bytes */
SDL_CalculateAudioSpec( &this->spec );
// Allocate memory buffers
stMCIBuffer.ulBufferSize = (this->spec.freq / 1000) * 100;// this->spec.size;
stMCIBuffer.ulBufferSize = this->spec.size;// (this->spec.freq / 1000) * 100;
stMCIBuffer.ulNumBuffers = NUM_BUFFERS;
stMCIBuffer.pBufList = &pAData->aMixBuffers;