/***************************************************************************
** Get address of region(s) from which we can read data.
** If the region is contiguous, size2 will be zero.
** If non-contiguous, size2 will be the size of second region.
** Returns room available to be written or numBytes, whichever is smaller.
*/
long RingBuffer_GetReadRegions( RingBuffer *rbuf, long numBytes,
void **dataPtr1, long *sizePtr1,
void **dataPtr2, long *sizePtr2 )
{
long index;
long available = RingBuffer_GetReadAvailable( rbuf );
if( numBytes > available ) numBytes = available;
/* Check to see if read is not contiguous. */
index = rbuf->readIndex & rbuf->smallMask;
if( (index + numBytes) > rbuf->bufferSize )
{
/* Write data in two blocks that wrap the buffer. */
long firstHalf = rbuf->bufferSize - index;
*dataPtr1 = &rbuf->buffer[index];
*sizePtr1 = firstHalf;
*dataPtr2 = &rbuf->buffer[0];
*sizePtr2 = numBytes - firstHalf;
}
else
{
*dataPtr1 = &rbuf->buffer[index];
*sizePtr1 = numBytes;
*dataPtr2 = NULL;
*sizePtr2 = 0;
}
return numBytes;
}
/*
* this is the BlioCallback function. It expects to recieve a PaMacBlio Object
* pointer as userData.
*
*/
int BlioCallback( const void *input, void *output, unsigned long frameCount,
const PaStreamCallbackTimeInfo* timeInfo,
PaStreamCallbackFlags statusFlags,
void *userData )
{
PaMacBlio *blio = (PaMacBlio*)userData;
long avail;
long toRead;
long toWrite;
/* set flags returned by OS: */
OSAtomicOr32( statusFlags, &blio->statusFlags ) ;
/* --- Handle Input Buffer --- */
if( blio->inChan ) {
avail = RingBuffer_GetWriteAvailable( &blio->inputRingBuffer );
/* check for underflow */
if( avail < frameCount * blio->inputSampleSize * blio->inChan )
OSAtomicOr32( paInputOverflow, &blio->statusFlags );
toRead = MIN( avail, frameCount * blio->inputSampleSize * blio->inChan );
/* copy the data */
/*printf( "reading %d\n", toRead );*/
assert( toRead == RingBuffer_Write( &blio->inputRingBuffer, input, toRead ) );
#ifdef PA_MAC__BLIO_MUTEX
/* Priority inversion. See notes below. */
blioSetIsInputEmpty( blio, false );
#endif
}
/* --- Handle Output Buffer --- */
if( blio->outChan ) {
avail = RingBuffer_GetReadAvailable( &blio->outputRingBuffer );
/* check for underflow */
if( avail < frameCount * blio->outputSampleSize * blio->outChan )
OSAtomicOr32( paOutputUnderflow, &blio->statusFlags );
toWrite = MIN( avail, frameCount * blio->outputSampleSize * blio->outChan );
if( toWrite != frameCount * blio->outputSampleSize * blio->outChan )
bzero( ((char *)output)+toWrite,
frameCount * blio->outputSampleSize * blio->outChan - toWrite );
/* copy the data */
/*printf( "writing %d\n", toWrite );*/
assert( toWrite == RingBuffer_Read( &blio->outputRingBuffer, output, toWrite ) );
#ifdef PA_MAC__BLIO_MUTEX
/* We have a priority inversion here. However, we will only have to
wait if this was true and is now false, which means we've got
some room in the buffer.
Hopefully problems will be minimized. */
blioSetIsOutputFull( blio, false );
#endif
}
return paContinue;
}
signed long GetStreamReadAvailable( PaStream* stream )
{
PaMacBlio *blio = & ((PaMacCoreStream*)stream) -> blio;
VVDBUG(("GetStreamReadAvailable()\n"));
return RingBuffer_GetReadAvailable( &blio->inputRingBuffer )
/ ( blio->outputSampleSize * blio->outChan );
}
/***************************************************************************
** Return number of bytes available for writing. */
long RingBuffer_GetWriteAvailable( RingBuffer *rbuf )
{
return ( rbuf->bufferSize - RingBuffer_GetReadAvailable(rbuf));
}
/***************************************************************************
** Return number of bytes available for writing. */
long RingBuffer_GetWriteAvailable( RingBuffer *rbuf )
{
/* Since we are calling RingBuffer_GetReadAvailable, we don't need an aditional MB */
return ( rbuf->bufferSize - RingBuffer_GetReadAvailable(rbuf));
}
PaError ReadStream( PaStream* stream,
void *buffer,
unsigned long frames )
{
PaMacBlio *blio = & ((PaMacCoreStream*)stream) -> blio;
char *cbuf = (char *) buffer;
PaError ret = paNoError;
VVDBUG(("ReadStream()\n"));
while( frames > 0 ) {
long avail;
long toRead;
do {
avail = RingBuffer_GetReadAvailable( &blio->inputRingBuffer );
/*
printf( "Read Buffer is %%%g full: %ld of %ld.\n",
100 * (float)avail / (float) blio->inputRingBuffer.bufferSize,
avail, blio->inputRingBuffer.bufferSize );
*/
if( avail == 0 ) {
#ifdef PA_MAC_BLIO_MUTEX
/**block when empty*/
ret = UNIX_ERR( pthread_mutex_lock( &blio->inputMutex ) );
if( ret )
return ret;
while( blio->isInputEmpty ) {
ret = UNIX_ERR( pthread_cond_wait( &blio->inputCond, &blio->inputMutex ) );
if( ret )
return ret;
}
ret = UNIX_ERR( pthread_mutex_unlock( &blio->inputMutex ) );
if( ret )
return ret;
#else
Pa_Sleep( PA_MAC_BLIO_BUSY_WAIT_SLEEP_INTERVAL );
#endif
}
} while( avail == 0 );
toRead = MIN( avail, frames * blio->inputSampleSize * blio->inChan );
toRead -= toRead % blio->inputSampleSize * blio->inChan ;
RingBuffer_Read( &blio->inputRingBuffer, (void *)cbuf, toRead );
cbuf += toRead;
frames -= toRead / ( blio->inputSampleSize * blio->inChan );
if( toRead == avail ) {
#ifdef PA_MAC_BLIO_MUTEX
/* we just emptied the buffer, so we need to mark it as empty. */
ret = blioSetIsInputEmpty( blio, true );
if( ret )
return ret;
/* of course, in the meantime, the callback may have put some sats
in, so
so check for that, too, to avoid a race condition. */
if( RingBuffer_GetReadAvailable( &blio->inputRingBuffer ) ) {
blioSetIsInputEmpty( blio, false );
if( ret )
return ret;
}
#endif
}
}
/* Report either paNoError or paInputOverflowed. */
/* may also want to report other errors, but this is non-standard. */
ret = blio->statusFlags & paInputOverflow;
/* report underflow only once: */
if( ret ) {
OSAtomicAnd32( ~paInputOverflow, &blio->statusFlags );
ret = paInputOverflowed;
}
return ret;
}
/************************************************************
* Return the number of frames that are available to be read from the
* stream without having to wait.
*/
long GetAudioStreamReadable( PABLIO_Stream *aStream )
{
int bytesFull = RingBuffer_GetReadAvailable( &aStream->inFIFO );
return bytesFull / aStream->inbytesPerFrame;
}
