diff options
author | IOhannes m zmölnig <zmoelnig@users.sourceforge.net> | 2008-02-08 13:00:32 +0000 |
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committer | IOhannes m zmölnig <zmoelnig@users.sourceforge.net> | 2008-02-08 13:00:32 +0000 |
commit | 4d84d14ac1aa13958eaa2971b03f7f929a519105 (patch) | |
tree | 6579d3f2cea5410a10c4baac8d0f372fb0dff372 /desiredata/src/s_audio_paring.h | |
parent | b334d38aefbd8e0e159d7af6c20d63c5d2b64859 (diff) |
reorganized
svn path=/trunk/; revision=9400
Diffstat (limited to 'desiredata/src/s_audio_paring.h')
-rw-r--r-- | desiredata/src/s_audio_paring.h | 101 |
1 files changed, 101 insertions, 0 deletions
diff --git a/desiredata/src/s_audio_paring.h b/desiredata/src/s_audio_paring.h new file mode 100644 index 00000000..5415f64a --- /dev/null +++ b/desiredata/src/s_audio_paring.h @@ -0,0 +1,101 @@ +#ifndef _PD_RINGBUFFER_H +#define _PD_RINGBUFFER_H +#ifdef __cplusplus +extern "C" +{ +#endif /* __cplusplus */ + +/* + * $Id: s_audio_paring.h,v 1.1.4.1.2.3 2006-01-24 01:29:54 xovo Exp $ + * ringbuffer.h + * Ring Buffer utility.. + * + * Author: Phil Burk, http://www.softsynth.com + * + * This program is distributed with the PortAudio Portable Audio Library. + * For more information see: http://www.audiomulch.com/portaudio/ + * 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. + * + * 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. + * + * 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. + * + */ +#include <stdio.h> +#include <stdlib.h> +#include <math.h> +#include <string.h> + +typedef struct +{ + long bufferSize; /* Number of bytes in FIFO. Power of 2. Set by RingBuffer_Init. */ +/* These are declared volatile because they are written by a different thread than the reader. */ + volatile long writeIndex; /* Index of next writable byte. Set by RingBuffer_AdvanceWriteIndex. */ + volatile long readIndex; /* Index of next readable byte. Set by RingBuffer_AdvanceReadIndex. */ + long bigMask; /* Used for wrapping indices with extra bit to distinguish full/empty. */ + long smallMask; /* Used for fitting indices to buffer. */ + char *buffer; +} +RingBuffer; +/* + * Initialize Ring Buffer. + * numBytes must be power of 2, returns -1 if not. + */ +long PD_RingBuffer_Init( RingBuffer *rbuf, long numBytes, void *dataPtr ); + +/* Clear buffer. Should only be called when buffer is NOT being read. */ +void PD_RingBuffer_Flush( RingBuffer *rbuf ); + +/* Return number of bytes available for writing. */ +long PD_RingBuffer_GetWriteAvailable( RingBuffer *rbuf ); +/* Return number of bytes available for read. */ +long PD_RingBuffer_GetReadAvailable( RingBuffer *rbuf ); +/* Return bytes written. */ +long PD_RingBuffer_Write( RingBuffer *rbuf, const void *data, long numBytes ); +/* Return bytes read. */ +long PD_RingBuffer_Read( RingBuffer *rbuf, void *data, long numBytes ); + +/* 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 numBytes, whichever is smaller. +*/ +long PD_RingBuffer_GetWriteRegions( RingBuffer *rbuf, long numBytes, + void **dataPtr1, long *sizePtr1, + void **dataPtr2, long *sizePtr2 ); +long PD_RingBuffer_AdvanceWriteIndex( RingBuffer *rbuf, long numBytes ); + +/* 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 numBytes, whichever is smaller. +*/ +long PD_RingBuffer_GetReadRegions( RingBuffer *rbuf, long numBytes, + void **dataPtr1, long *sizePtr1, + void **dataPtr2, long *sizePtr2 ); + +long PD_RingBuffer_AdvanceReadIndex( RingBuffer *rbuf, long numBytes ); + +#ifdef __cplusplus +} +#endif /* __cplusplus */ +#endif /* _PD_RINGBUFFER_H */ |