s_audio_paring.c | Explore in Territory

/*
 * ringbuffer.c
 * Ring Buffer utility..
 *
 * Author: Phil Burk, http://www.softsynth.com
 *
 * This program uses 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.
 *
 * modified 2002/07/13 by [email protected] to allow any number if channels
 *
 * extensively hacked by [email protected] for various reasons
 *
 */

#include "s_audio_paring.h"

#include <stdlib.h>
#include <stdio.h>
#include <string.h>

#ifdef _WIN32
#include <windows.h>
#else /* _WIN32 */
#include <sys/time.h>
#include <errno.h>
#if defined(__APPLE__) && defined(__MACH__)
/* macOS does not support unnamed posix semaphores,
 * so we use Mach semaphores instead. */
#include <mach/mach.h>
#define HAVE_MACH_SEMAPHORE
#elif defined(__linux__) || defined(__FreeBSD__) || \
    defined(__NetBSD__) || defined(__OpenBSD__)
#include <semaphore.h>
#define HAVE_POSIX_SEMAPHORE
#else
/* Some platforms (including Apple) do not support unnamed posix semaphores,
 * others might not implement sem_timedwait(); to be on the safe side, we
 * we simply emulate it with a counter, mutex and condition variable.
 * The critical section is so short that there should not be any locking.
 */
#include <pthread.h>
#endif
#endif /* _WIN32 */

/* Clear buffer. Should only be called when buffer is NOT being read. */
static void sys_ringbuf_Flush(sys_ringbuf *rbuf,
    void *dataPtr, long nfill);

/* 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.
*/
static long sys_ringbuf_GetWriteRegions(sys_ringbuf *rbuf,
    long numBytes, void **dataPtr1, long *sizePtr1,
    void **dataPtr2, long *sizePtr2, char *buffer);

static long sys_ringbuf_AdvanceWriteIndex(sys_ringbuf *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.
*/
static long sys_ringbuf_GetReadRegions(sys_ringbuf *rbuf,
    long numBytes, void **dataPtr1, long *sizePtr1,
    void **dataPtr2, long *sizePtr2, char *buffer);

static long sys_ringbuf_AdvanceReadIndex(sys_ringbuf *rbuf, long numBytes);

/***************************************************************************
 * Initialize FIFO.
 */
long sys_ringbuf_init(sys_ringbuf *rbuf, long numBytes,
    char *dataPtr, long nfill)
{ … }
/***************************************************************************
** Return number of bytes available for reading. */
long sys_ringbuf_getreadavailable(sys_ringbuf *rbuf)
{ … }
/***************************************************************************
** Return number of bytes available for writing. */
long sys_ringbuf_getwriteavailable(sys_ringbuf *rbuf)
{ … }

/***************************************************************************
** Clear buffer. Should only be called when buffer is NOT being read. */
static void sys_ringbuf_Flush(sys_ringbuf *rbuf,
    void *dataPtr, long nfill)
{ … }

/***************************************************************************
** 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.
*/
static long sys_ringbuf_GetWriteRegions(sys_ringbuf *rbuf,
    long numBytes, void **dataPtr1, long *sizePtr1,
    void **dataPtr2, long *sizePtr2, char *buffer)
{ … }


/***************************************************************************
*/
static long sys_ringbuf_AdvanceWriteIndex(sys_ringbuf *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 written or numBytes, whichever is smaller.
*/
static long sys_ringbuf_GetReadRegions(sys_ringbuf *rbuf,
    long numBytes, void **dataPtr1, long *sizePtr1,
    void **dataPtr2, long *sizePtr2, char *buffer)
{ … }
/***************************************************************************
*/
static long sys_ringbuf_AdvanceReadIndex(sys_ringbuf *rbuf,
    long numBytes)
{ … }

/***************************************************************************
** Return bytes written. */
long sys_ringbuf_write(sys_ringbuf *rbuf, const void *data,
    long numBytes, char *buffer)
{ … }

/***************************************************************************
** Return bytes read. */
long sys_ringbuf_read(sys_ringbuf *rbuf, void *data, long numBytes,
    char *buffer)
{ … }

/***************************************************************************
** t_semaphore */

#ifndef _WIN32
struct _semaphore
{ … };
#endif

t_semaphore * sys_semaphore_create(void)
{ … }

void sys_semaphore_destroy(t_semaphore *sem)
{ … }

void sys_semaphore_wait(t_semaphore *sem)
{ … }

int sys_semaphore_waitfor(t_semaphore *sem, double seconds)
{ … }

void sys_semaphore_post(t_semaphore *sem)
{ … }
pure-data/src/s_audio_paring.c
