Chris@39: #ifndef PA_LINUX_ALSA_H
Chris@39: #define PA_LINUX_ALSA_H
Chris@39: 
Chris@39: /*
Chris@39:  * $Id: pa_linux_alsa.h 1597 2011-02-11 00:15:51Z dmitrykos $
Chris@39:  * PortAudio Portable Real-Time Audio Library
Chris@39:  * ALSA-specific extensions
Chris@39:  *
Chris@39:  * Copyright (c) 1999-2000 Ross Bencina and Phil Burk
Chris@39:  *
Chris@39:  * Permission is hereby granted, free of charge, to any person obtaining
Chris@39:  * a copy of this software and associated documentation files
Chris@39:  * (the "Software"), to deal in the Software without restriction,
Chris@39:  * including without limitation the rights to use, copy, modify, merge,
Chris@39:  * publish, distribute, sublicense, and/or sell copies of the Software,
Chris@39:  * and to permit persons to whom the Software is furnished to do so,
Chris@39:  * subject to the following conditions:
Chris@39:  *
Chris@39:  * The above copyright notice and this permission notice shall be
Chris@39:  * included in all copies or substantial portions of the Software.
Chris@39:  *
Chris@39:  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
Chris@39:  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
Chris@39:  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
Chris@39:  * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR
Chris@39:  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
Chris@39:  * CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
Chris@39:  * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
Chris@39:  */
Chris@39: 
Chris@39: /*
Chris@39:  * The text above constitutes the entire PortAudio license; however, 
Chris@39:  * the PortAudio community also makes the following non-binding requests:
Chris@39:  *
Chris@39:  * Any person wishing to distribute modifications to the Software is
Chris@39:  * requested to send the modifications to the original developer so that
Chris@39:  * they can be incorporated into the canonical version. It is also 
Chris@39:  * requested that these non-binding requests be included along with the 
Chris@39:  * license above.
Chris@39:  */
Chris@39: 
Chris@39: /** @file
Chris@39:  *  @ingroup public_header
Chris@39:  *  @brief ALSA-specific PortAudio API extension header file.
Chris@39:  */
Chris@39: 
Chris@39: #include "portaudio.h"
Chris@39: 
Chris@39: #ifdef __cplusplus
Chris@39: extern "C" {
Chris@39: #endif
Chris@39: 
Chris@39: typedef struct PaAlsaStreamInfo
Chris@39: {
Chris@39:     unsigned long size;
Chris@39:     PaHostApiTypeId hostApiType;
Chris@39:     unsigned long version;
Chris@39: 
Chris@39:     const char *deviceString;
Chris@39: }
Chris@39: PaAlsaStreamInfo;
Chris@39: 
Chris@39: /** Initialize host API specific structure, call this before setting relevant attributes. */
Chris@39: void PaAlsa_InitializeStreamInfo( PaAlsaStreamInfo *info );
Chris@39: 
Chris@39: /** Instruct whether to enable real-time priority when starting the audio thread.
Chris@39:  *
Chris@39:  * If this is turned on by the stream is started, the audio callback thread will be created
Chris@39:  * with the FIFO scheduling policy, which is suitable for realtime operation.
Chris@39:  **/
Chris@39: void PaAlsa_EnableRealtimeScheduling( PaStream *s, int enable );
Chris@39: 
Chris@39: #if 0
Chris@39: void PaAlsa_EnableWatchdog( PaStream *s, int enable );
Chris@39: #endif
Chris@39: 
Chris@39: /** Get the ALSA-lib card index of this stream's input device. */
Chris@39: PaError PaAlsa_GetStreamInputCard( PaStream *s, int *card );
Chris@39: 
Chris@39: /** Get the ALSA-lib card index of this stream's output device. */
Chris@39: PaError PaAlsa_GetStreamOutputCard( PaStream *s, int *card );
Chris@39: 
Chris@39: /** Set the number of periods (buffer fragments) to configure devices with.
Chris@39:  *
Chris@39:  * By default the number of periods is 4, this is the lowest number of periods that works well on
Chris@39:  * the author's soundcard.
Chris@39:  * @param numPeriods The number of periods.
Chris@39:  */
Chris@39: PaError PaAlsa_SetNumPeriods( int numPeriods );
Chris@39: 
Chris@39: /** Set the maximum number of times to retry opening busy device (sleeping for a
Chris@39:  * short interval inbetween).
Chris@39:  */
Chris@39: PaError PaAlsa_SetRetriesBusy( int retries );
Chris@39: 
Chris@39: /** Set the path and name of ALSA library file if PortAudio is configured to load it dynamically (see
Chris@39:  *  PA_ALSA_DYNAMIC). This setting will overwrite the default name set by PA_ALSA_PATHNAME define.
Chris@39:  * @param pathName Full path with filename. Only filename can be used, but dlopen() will lookup default
Chris@39:  *                 searchable directories (/usr/lib;/usr/local/lib) then.
Chris@39:  */
Chris@39: void PaAlsa_SetLibraryPathName( const char *pathName );
Chris@39: 
Chris@39: #ifdef __cplusplus
Chris@39: }
Chris@39: #endif
Chris@39: 
Chris@39: #endif