| /* |
| * Copyright (c) 2003, 2007, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| //#define USE_ERROR |
| //#define USE_TRACE |
| |
| #include "PLATFORM_API_LinuxOS_ALSA_CommonUtils.h" |
| |
| static void alsaDebugOutput(const char *file, int line, const char *function, int err, const char *fmt, ...) { |
| #ifdef USE_ERROR |
| va_list args; |
| va_start(args, fmt); |
| printf("%s:%d function %s: error %d: %s\n", file, line, function, err, snd_strerror(err)); |
| if (strlen(fmt) > 0) { |
| vprintf(fmt, args); |
| } |
| va_end(args); |
| #endif |
| } |
| |
| static int alsa_inited = 0; |
| static int alsa_enumerate_pcm_subdevices = FALSE; // default: no |
| static int alsa_enumerate_midi_subdevices = FALSE; // default: no |
| |
| void initAlsaSupport() { |
| char* enumerate; |
| if (!alsa_inited) { |
| alsa_inited = TRUE; |
| snd_lib_error_set_handler(&alsaDebugOutput); |
| |
| enumerate = getenv(ENV_ENUMERATE_PCM_SUBDEVICES); |
| if (enumerate != NULL && strlen(enumerate) > 0 |
| && (enumerate[0] != 'f') // false |
| && (enumerate[0] != 'F') // False |
| && (enumerate[0] != 'n') // no |
| && (enumerate[0] != 'N')) { // NO |
| alsa_enumerate_pcm_subdevices = TRUE; |
| } |
| #ifdef ALSA_MIDI_ENUMERATE_SUBDEVICES |
| alsa_enumerate_midi_subdevices = TRUE; |
| #endif |
| } |
| } |
| |
| |
| /* if true (non-zero), ALSA sub devices should be listed as separate devices |
| */ |
| int needEnumerateSubdevices(int isMidi) { |
| initAlsaSupport(); |
| return isMidi ? alsa_enumerate_midi_subdevices |
| : alsa_enumerate_pcm_subdevices; |
| } |
| |
| |
| /* |
| * deviceID contains packed card, device and subdevice numbers |
| * each number takes 10 bits |
| * "default" device has id == ALSA_DEFAULT_DEVICE_ID |
| */ |
| UINT32 encodeDeviceID(int card, int device, int subdevice) { |
| return (((card & 0x3FF) << 20) | ((device & 0x3FF) << 10) |
| | (subdevice & 0x3FF)) + 1; |
| } |
| |
| |
| void decodeDeviceID(UINT32 deviceID, int* card, int* device, int* subdevice, |
| int isMidi) { |
| deviceID--; |
| *card = (deviceID >> 20) & 0x3FF; |
| *device = (deviceID >> 10) & 0x3FF; |
| if (needEnumerateSubdevices(isMidi)) { |
| *subdevice = deviceID & 0x3FF; |
| } else { |
| *subdevice = -1; // ALSA will choose any subdevices |
| } |
| } |
| |
| |
| void getDeviceString(char* buffer, int card, int device, int subdevice, |
| int usePlugHw, int isMidi) { |
| if (needEnumerateSubdevices(isMidi)) { |
| sprintf(buffer, "%s:%d,%d,%d", |
| usePlugHw ? ALSA_PLUGHARDWARE : ALSA_HARDWARE, |
| card, device, subdevice); |
| } else { |
| sprintf(buffer, "%s:%d,%d", |
| usePlugHw ? ALSA_PLUGHARDWARE : ALSA_HARDWARE, |
| card, device); |
| } |
| } |
| |
| |
| void getDeviceStringFromDeviceID(char* buffer, UINT32 deviceID, |
| int usePlugHw, int isMidi) { |
| int card, device, subdevice; |
| |
| if (deviceID == ALSA_DEFAULT_DEVICE_ID) { |
| strcpy(buffer, ALSA_DEFAULT_DEVICE_NAME); |
| } else { |
| decodeDeviceID(deviceID, &card, &device, &subdevice, isMidi); |
| getDeviceString(buffer, card, device, subdevice, usePlugHw, isMidi); |
| } |
| } |
| |
| |
| static int hasGottenALSAVersion = FALSE; |
| #define ALSAVersionString_LENGTH 200 |
| static char ALSAVersionString[ALSAVersionString_LENGTH]; |
| |
| void getALSAVersion(char* buffer, int len) { |
| if (!hasGottenALSAVersion) { |
| // get alsa version from proc interface |
| FILE* file; |
| int curr, len, totalLen, inVersionString; |
| file = fopen(ALSA_VERSION_PROC_FILE, "r"); |
| ALSAVersionString[0] = 0; |
| if (file) { |
| fgets(ALSAVersionString, ALSAVersionString_LENGTH, file); |
| // parse for version number |
| totalLen = strlen(ALSAVersionString); |
| inVersionString = FALSE; |
| len = 0; |
| curr = 0; |
| while (curr < totalLen) { |
| if (!inVersionString) { |
| // is this char the beginning of a version string ? |
| if (ALSAVersionString[curr] >= '0' |
| && ALSAVersionString[curr] <= '9') { |
| inVersionString = TRUE; |
| } |
| } |
| if (inVersionString) { |
| // the version string ends with white space |
| if (ALSAVersionString[curr] <= 32) { |
| break; |
| } |
| if (curr != len) { |
| // copy this char to the beginning of the string |
| ALSAVersionString[len] = ALSAVersionString[curr]; |
| } |
| len++; |
| } |
| curr++; |
| } |
| // remove trailing dots |
| while ((len > 0) && (ALSAVersionString[len - 1] == '.')) { |
| len--; |
| } |
| // null terminate |
| ALSAVersionString[len] = 0; |
| } |
| hasGottenALSAVersion = TRUE; |
| } |
| strncpy(buffer, ALSAVersionString, len); |
| } |
| |
| |
| /* end */ |