1 /*

     2  * Copyright 2003-2007 Sun Microsystems, Inc.  All Rights Reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.  Sun designates this

     8  * particular file as subject to the "Classpath" exception as provided

     9  * by Sun in the LICENSE file that accompanied this code.

    10  *

    11  * This code is distributed in the hope that it will be useful, but WITHOUT

    12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    14  * version 2 for more details (a copy is included in the LICENSE file that

    15  * accompanied this code).

    16  *

    17  * You should have received a copy of the GNU General Public License version

    18  * 2 along with this work; if not, write to the Free Software Foundation,

    19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    20  *

    21  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

    22  * CA 95054 USA or visit www.sun.com if you need additional information or

    23  * have any questions.

    24  */

    25 

    26 // define this with a later version of ALSA than 0.9.0rc3

    27 #define ALSA_PCM_NEW_HW_PARAMS_API

    28 #include <alsa/asoundlib.h>

    29 #include "Utilities.h"

    30 

    31 #ifndef PLATFORM_API_LINUXOS_ALSA_PCMUTILS_H_INCLUDED

    32 #define PLATFORM_API_LINUXOS_ALSA_PCMUTILS_H_INCLUDED

    33 

    34 // if this is defined, use plughw: devices

    35 #define ALSA_PCM_USE_PLUGHW

    36 //#undef ALSA_PCM_USE_PLUGHW

    37 

    38 

    39 // maximum number of channels that is listed in the formats. If more, than

    40 // just -1 for channel count is used.

    41 #define MAXIMUM_LISTED_CHANNELS 32

    42 

    43 typedef struct tag_ALSA_AudioDeviceDescription {

    44     int index;          // in

    45     int strLen;         // in

    46     INT32* deviceID;    // out

    47     int* maxSimultaneousLines; // out

    48     char* name;         // out

    49     char* vendor;       // out

    50     char* description;  // out

    51     char* version;      // out

    52 } ALSA_AudioDeviceDescription;

    53 

    54 

    55 

    56 int getAudioDeviceCount();

    57 int getAudioDeviceDescriptionByIndex(ALSA_AudioDeviceDescription* desc);

    58 

    59 // returns ALSA error code, or 0 if successful

    60 int openPCMfromDeviceID(int deviceID, snd_pcm_t** handle, int isSource, int hardware);

    61 

    62 // returns 1 if successful

    63 // enc: 0 for PCM, 1 for ULAW, 2 for ALAW (see DirectAudio.h)

    64 int getFormatFromAlsaFormat(snd_pcm_format_t alsaFormat,

    65                             int* sampleSizeInBytes, int* significantBits,

    66                             int* isSigned, int* isBigEndian, int* enc);

    67 

    68 int getAlsaFormatFromFormat(snd_pcm_format_t* alsaFormat,

    69                             int sampleSizeInBytes, int significantBits,

    70                             int isSigned, int isBigEndian, int enc);

    71 

    72 #endif // PLATFORM_API_LINUXOS_ALSA_PCMUTILS_H_INCLUDED