static void FillBufferPortion(char * ptr, int remaining)
{
int len;
char *sptr;
while (remaining > 0) {
if (MixBufferUsed == MixBufferSize) {
MixCallBack();
MixBufferUsed = 0;
MixBufferCurrent++;
if (MixBufferCurrent >= MixBufferCount) {
MixBufferCurrent -= MixBufferCount;
}
}
while (remaining > 0 && MixBufferUsed < MixBufferSize) {
sptr = MixBuffer + (MixBufferCurrent * MixBufferSize) + MixBufferUsed;
len = MixBufferSize - MixBufferUsed;
if (remaining < len) {
len = remaining;
}
memcpy(ptr, sptr, len);
ptr += len;
MixBufferUsed += len;
remaining -= len;
}
}
}
int32_t SDLDrv_PCM_BeginPlayback(char *BufferStart, int32_t BufferSize,
int32_t NumDivisions, void ( *CallBackFunc )( void ) )
{
if (!Initialised) {
ErrorCode = SDLErr_Uninitialised;
return SDLErr_Error;
}
if (Playing) {
SDLDrv_PCM_StopPlayback();
}
MixBuffer = BufferStart;
MixBufferSize = BufferSize;
MixBufferCount = NumDivisions;
MixBufferCurrent = 0;
MixBufferUsed = 0;
MixCallBack = CallBackFunc;
// prime the buffer
MixCallBack();
Mix_Resume(-1);
Playing = 1;
return SDLErr_Ok;
}
int CoreAudioDrv_PCM_BeginPlayback(char *BufferStart, int BufferSize,
int NumDivisions, void ( *CallBackFunc )( void ) )
{
if (!Initialised) {
ErrorCode = CAErr_Uninitialised;
return CAErr_Error;
}
if (Playing) {
CoreAudioDrv_PCM_StopPlayback();
}
MixBuffer = BufferStart;
MixBufferSize = BufferSize;
MixBufferCount = NumDivisions;
MixBufferCurrent = 0;
MixBufferUsed = 0;
MixCallBack = CallBackFunc;
// prime the buffer
MixCallBack();
AudioOutputUnitStart(output_audio_unit);
Playing = 1;
return CAErr_Ok;
}
static OSStatus fillInput( void * inRefCon,
AudioUnitRenderActionFlags * ioActionFlags,
const AudioTimeStamp * inTimeStamp,
UInt32 inBusNumber,
UInt32 inNumberFrames,
AudioBufferList * ioDataList)
{
UInt32 remaining, len;
char *ptr, *sptr;
AudioBuffer *ioData;
ioData = &ioDataList->mBuffers[0];
remaining = ioData->mDataByteSize;
ptr = ioData->mData;
while (remaining > 0) {
if (MixBufferUsed == MixBufferSize) {
CoreAudioDrv_PCM_Lock();
MixCallBack();
CoreAudioDrv_PCM_Unlock();
MixBufferUsed = 0;
MixBufferCurrent++;
if (MixBufferCurrent >= MixBufferCount) {
MixBufferCurrent -= MixBufferCount;
}
}
while (remaining > 0 && MixBufferUsed < MixBufferSize) {
sptr = MixBuffer + (MixBufferCurrent * MixBufferSize) + MixBufferUsed;
len = MixBufferSize - MixBufferUsed;
if (remaining < len) {
len = remaining;
}
memcpy(ptr, sptr, len);
ptr += len;
MixBufferUsed += len;
remaining -= len;
}
}
return noErr;
}
static void fillData(int32_t chan, void *ptr, int32_t remaining, void *udata)
{
int32_t len;
char *sptr;
UNREFERENCED_PARAMETER(chan);
UNREFERENCED_PARAMETER(udata);
if (!MixBuffer || !MixCallBack)
return;
SDL_LockMutex(EffectFence);
while (remaining > 0) {
if (MixBufferUsed == MixBufferSize) {
MixCallBack();
MixBufferUsed = 0;
MixBufferCurrent++;
if (MixBufferCurrent >= MixBufferCount) {
MixBufferCurrent -= MixBufferCount;
}
}
while (remaining > 0 && MixBufferUsed < MixBufferSize) {
sptr = MixBuffer + (MixBufferCurrent * MixBufferSize) + MixBufferUsed;
len = MixBufferSize - MixBufferUsed;
if (remaining < len) {
len = remaining;
}
memcpy(ptr, sptr, len);
ptr = (void *)((uintptr_t)(ptr) + len);
MixBufferUsed += len;
remaining -= len;
}
}
SDL_UnlockMutex(EffectFence);
}
