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- #ifndef PA_LINUX_ALSA_H
- #define PA_LINUX_ALSA_H
- /*
- * $Id: pa_linux_alsa.h 1597 2011-02-11 00:15:51Z dmitrykos $
- * PortAudio Portable Real-Time Audio Library
- * ALSA-specific extensions
- *
- * 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 public_header
- * @brief ALSA-specific PortAudio API extension header file.
- */
- #include "portaudio.h"
- #ifdef __cplusplus
- extern "C" {
- #endif
- typedef struct PaAlsaStreamInfo
- {
- unsigned long size;
- PaHostApiTypeId hostApiType;
- unsigned long version;
- const char *deviceString;
- }
- PaAlsaStreamInfo;
- /** Initialize host API specific structure, call this before setting relevant attributes. */
- void PaAlsa_InitializeStreamInfo( PaAlsaStreamInfo *info );
- /** Instruct whether to enable real-time priority when starting the audio thread.
- *
- * If this is turned on by the stream is started, the audio callback thread will be created
- * with the FIFO scheduling policy, which is suitable for realtime operation.
- **/
- void PaAlsa_EnableRealtimeScheduling( PaStream *s, int enable );
- #if 0
- void PaAlsa_EnableWatchdog( PaStream *s, int enable );
- #endif
- /** Get the ALSA-lib card index of this stream's input device. */
- PaError PaAlsa_GetStreamInputCard( PaStream *s, int *card );
- /** Get the ALSA-lib card index of this stream's output device. */
- PaError PaAlsa_GetStreamOutputCard( PaStream *s, int *card );
- /** Set the number of periods (buffer fragments) to configure devices with.
- *
- * By default the number of periods is 4, this is the lowest number of periods that works well on
- * the author's soundcard.
- * @param numPeriods The number of periods.
- */
- PaError PaAlsa_SetNumPeriods( int numPeriods );
- /** Set the maximum number of times to retry opening busy device (sleeping for a
- * short interval inbetween).
- */
- PaError PaAlsa_SetRetriesBusy( int retries );
- /** Set the path and name of ALSA library file if PortAudio is configured to load it dynamically (see
- * PA_ALSA_DYNAMIC). This setting will overwrite the default name set by PA_ALSA_PATHNAME define.
- * @param pathName Full path with filename. Only filename can be used, but dlopen() will lookup default
- * searchable directories (/usr/lib;/usr/local/lib) then.
- */
- void PaAlsa_SetLibraryPathName( const char *pathName );
- PaError PaAlsa_Initialize( PaUtilHostApiRepresentation **hostApi, PaHostApiIndex hostApiIndex ); // ppgb
- #ifdef __cplusplus
- }
- #endif
- #endif
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