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-rw-r--r--portaudio/src/common/pa_ringbuffer.c237
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diff --git a/portaudio/src/common/pa_ringbuffer.c b/portaudio/src/common/pa_ringbuffer.c
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--- a/portaudio/src/common/pa_ringbuffer.c
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-/*
- * $Id$
- * Portable Audio I/O Library
- * Ring Buffer utility.
- *
- * Author: Phil Burk, http://www.softsynth.com
- * modified for SMP safety on Mac OS X by Bjorn Roche
- * modified for SMP safety on Linux by Leland Lucius
- * also, allowed for const where possible
- * modified for multiple-byte-sized data elements by Sven Fischer
- *
- * Note that this is safe only for a single-thread reader and a
- * single-thread writer.
- *
- * This program uses the PortAudio Portable Audio Library.
- * For more information see: http://www.portaudio.com
- * Copyright (c) 1999-2000 Ross Bencina and Phil Burk
- *
- * Permission is hereby granted, free of charge, to any person obtaining
- * a copy of this software and associated documentation files
- * (the "Software"), to deal in the Software without restriction,
- * including without limitation the rights to use, copy, modify, merge,
- * publish, distribute, sublicense, and/or sell copies of the Software,
- * and to permit persons to whom the Software is furnished to do so,
- * subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be
- * included in all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
- * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
- * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
- * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR
- * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
- * CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
- * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
- */
-
-/*
- * The text above constitutes the entire PortAudio license; however,
- * the PortAudio community also makes the following non-binding requests:
- *
- * Any person wishing to distribute modifications to the Software is
- * requested to send the modifications to the original developer so that
- * they can be incorporated into the canonical version. It is also
- * requested that these non-binding requests be included along with the
- * license above.
- */
-
-/**
- @file
- @ingroup common_src
-*/
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <math.h>
-#include "pa_ringbuffer.h"
-#include <string.h>
-#include "pa_memorybarrier.h"
-
-/***************************************************************************
- * Initialize FIFO.
- * elementCount must be power of 2, returns -1 if not.
- */
-ring_buffer_size_t PaUtil_InitializeRingBuffer( PaUtilRingBuffer *rbuf, ring_buffer_size_t elementSizeBytes, ring_buffer_size_t elementCount, void *dataPtr )
-{
- if( ((elementCount-1) & elementCount) != 0) return -1; /* Not Power of two. */
- rbuf->bufferSize = elementCount;
- rbuf->buffer = (char *)dataPtr;
- PaUtil_FlushRingBuffer( rbuf );
- rbuf->bigMask = (elementCount*2)-1;
- rbuf->smallMask = (elementCount)-1;
- rbuf->elementSizeBytes = elementSizeBytes;
- return 0;
-}
-
-/***************************************************************************
-** Return number of elements available for reading. */
-ring_buffer_size_t PaUtil_GetRingBufferReadAvailable( const PaUtilRingBuffer *rbuf )
-{
- return ( (rbuf->writeIndex - rbuf->readIndex) & rbuf->bigMask );
-}
-/***************************************************************************
-** Return number of elements available for writing. */
-ring_buffer_size_t PaUtil_GetRingBufferWriteAvailable( const PaUtilRingBuffer *rbuf )
-{
- return ( rbuf->bufferSize - PaUtil_GetRingBufferReadAvailable(rbuf));
-}
-
-/***************************************************************************
-** Clear buffer. Should only be called when buffer is NOT being read or written. */
-void PaUtil_FlushRingBuffer( PaUtilRingBuffer *rbuf )
-{
- rbuf->writeIndex = rbuf->readIndex = 0;
-}
-
-/***************************************************************************
-** Get address of region(s) to which we can write 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 elementCount, whichever is smaller.
-*/
-ring_buffer_size_t PaUtil_GetRingBufferWriteRegions( PaUtilRingBuffer *rbuf, ring_buffer_size_t elementCount,
- void **dataPtr1, ring_buffer_size_t *sizePtr1,
- void **dataPtr2, ring_buffer_size_t *sizePtr2 )
-{
- ring_buffer_size_t index;
- ring_buffer_size_t available = PaUtil_GetRingBufferWriteAvailable( rbuf );
- if( elementCount > available ) elementCount = available;
- /* Check to see if write is not contiguous. */
- index = rbuf->writeIndex & rbuf->smallMask;
- if( (index + elementCount) > rbuf->bufferSize )
- {
- /* Write data in two blocks that wrap the buffer. */
- ring_buffer_size_t firstHalf = rbuf->bufferSize - index;
- *dataPtr1 = &rbuf->buffer[index*rbuf->elementSizeBytes];
- *sizePtr1 = firstHalf;
- *dataPtr2 = &rbuf->buffer[0];
- *sizePtr2 = elementCount - firstHalf;
- }
- else
- {
- *dataPtr1 = &rbuf->buffer[index*rbuf->elementSizeBytes];
- *sizePtr1 = elementCount;
- *dataPtr2 = NULL;
- *sizePtr2 = 0;
- }
-
- if( available )
- PaUtil_FullMemoryBarrier(); /* (write-after-read) => full barrier */
-
- return elementCount;
-}
-
-
-/***************************************************************************
-*/
-ring_buffer_size_t PaUtil_AdvanceRingBufferWriteIndex( PaUtilRingBuffer *rbuf, ring_buffer_size_t elementCount )
-{
- /* ensure that previous writes are seen before we update the write index
- (write after write)
- */
- PaUtil_WriteMemoryBarrier();
- return rbuf->writeIndex = (rbuf->writeIndex + elementCount) & rbuf->bigMask;
-}
-
-/***************************************************************************
-** 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 read or elementCount, whichever is smaller.
-*/
-ring_buffer_size_t PaUtil_GetRingBufferReadRegions( PaUtilRingBuffer *rbuf, ring_buffer_size_t elementCount,
- void **dataPtr1, ring_buffer_size_t *sizePtr1,
- void **dataPtr2, ring_buffer_size_t *sizePtr2 )
-{
- ring_buffer_size_t index;
- ring_buffer_size_t available = PaUtil_GetRingBufferReadAvailable( rbuf ); /* doesn't use memory barrier */
- if( elementCount > available ) elementCount = available;
- /* Check to see if read is not contiguous. */
- index = rbuf->readIndex & rbuf->smallMask;
- if( (index + elementCount) > rbuf->bufferSize )
- {
- /* Write data in two blocks that wrap the buffer. */
- ring_buffer_size_t firstHalf = rbuf->bufferSize - index;
- *dataPtr1 = &rbuf->buffer[index*rbuf->elementSizeBytes];
- *sizePtr1 = firstHalf;
- *dataPtr2 = &rbuf->buffer[0];
- *sizePtr2 = elementCount - firstHalf;
- }
- else
- {
- *dataPtr1 = &rbuf->buffer[index*rbuf->elementSizeBytes];
- *sizePtr1 = elementCount;
- *dataPtr2 = NULL;
- *sizePtr2 = 0;
- }
-
- if( available )
- PaUtil_ReadMemoryBarrier(); /* (read-after-read) => read barrier */
-
- return elementCount;
-}
-/***************************************************************************
-*/
-ring_buffer_size_t PaUtil_AdvanceRingBufferReadIndex( PaUtilRingBuffer *rbuf, ring_buffer_size_t elementCount )
-{
- /* ensure that previous reads (copies out of the ring buffer) are always completed before updating (writing) the read index.
- (write-after-read) => full barrier
- */
- PaUtil_FullMemoryBarrier();
- return rbuf->readIndex = (rbuf->readIndex + elementCount) & rbuf->bigMask;
-}
-
-/***************************************************************************
-** Return elements written. */
-ring_buffer_size_t PaUtil_WriteRingBuffer( PaUtilRingBuffer *rbuf, const void *data, ring_buffer_size_t elementCount )
-{
- ring_buffer_size_t size1, size2, numWritten;
- void *data1, *data2;
- numWritten = PaUtil_GetRingBufferWriteRegions( rbuf, elementCount, &data1, &size1, &data2, &size2 );
- if( size2 > 0 )
- {
-
- memcpy( data1, data, size1*rbuf->elementSizeBytes );
- data = ((char *)data) + size1*rbuf->elementSizeBytes;
- memcpy( data2, data, size2*rbuf->elementSizeBytes );
- }
- else
- {
- memcpy( data1, data, size1*rbuf->elementSizeBytes );
- }
- PaUtil_AdvanceRingBufferWriteIndex( rbuf, numWritten );
- return numWritten;
-}
-
-/***************************************************************************
-** Return elements read. */
-ring_buffer_size_t PaUtil_ReadRingBuffer( PaUtilRingBuffer *rbuf, void *data, ring_buffer_size_t elementCount )
-{
- ring_buffer_size_t size1, size2, numRead;
- void *data1, *data2;
- numRead = PaUtil_GetRingBufferReadRegions( rbuf, elementCount, &data1, &size1, &data2, &size2 );
- if( size2 > 0 )
- {
- memcpy( data, data1, size1*rbuf->elementSizeBytes );
- data = ((char *)data) + size1*rbuf->elementSizeBytes;
- memcpy( data, data2, size2*rbuf->elementSizeBytes );
- }
- else
- {
- memcpy( data, data1, size1*rbuf->elementSizeBytes );
- }
- PaUtil_AdvanceRingBufferReadIndex( rbuf, numRead );
- return numRead;
-}
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