/* * Copyright (c) 2003, 2014, 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_PCMUtils.h" #include "PLATFORM_API_LinuxOS_ALSA_CommonUtils.h" // callback for iteration through devices // returns TRUE if iteration should continue // NOTE: cardinfo may be NULL (for "default" device) typedef int (*DeviceIteratorPtr)(UINT32 deviceID, snd_pcm_info_t* pcminfo, snd_ctl_card_info_t* cardinfo, void *userData); // for each ALSA device, call iterator. userData is passed to the iterator // returns total number of iterations int iteratePCMDevices(DeviceIteratorPtr iterator, void* userData) { int count = 0; int subdeviceCount; int card, dev, subDev; char devname[16]; int err; snd_ctl_t *handle; snd_pcm_t *pcm; snd_pcm_info_t* pcminfo; snd_ctl_card_info_t *cardinfo, *defcardinfo = NULL; UINT32 deviceID; int doContinue = TRUE; snd_pcm_info_malloc(&pcminfo); snd_ctl_card_info_malloc(&cardinfo); // 1st try "default" device err = snd_pcm_open(&pcm, ALSA_DEFAULT_DEVICE_NAME, SND_PCM_STREAM_PLAYBACK, SND_PCM_NONBLOCK); if (err < 0) { // try with the other direction err = snd_pcm_open(&pcm, ALSA_DEFAULT_DEVICE_NAME, SND_PCM_STREAM_CAPTURE, SND_PCM_NONBLOCK); } if (err < 0) { ERROR1("ERROR: snd_pcm_open (\"default\"): %s\n", snd_strerror(err)); } else { err = snd_pcm_info(pcm, pcminfo); snd_pcm_close(pcm); if (err < 0) { ERROR1("ERROR: snd_pcm_info (\"default\"): %s\n", snd_strerror(err)); } else { // try to get card info card = snd_pcm_info_get_card(pcminfo); if (card >= 0) { sprintf(devname, ALSA_HARDWARE_CARD, card); if (snd_ctl_open(&handle, devname, SND_CTL_NONBLOCK) >= 0) { if (snd_ctl_card_info(handle, cardinfo) >= 0) { defcardinfo = cardinfo; } snd_ctl_close(handle); } } // call callback function for the device if (iterator != NULL) { doContinue = (*iterator)(ALSA_DEFAULT_DEVICE_ID, pcminfo, defcardinfo, userData); } count++; } } // iterate cards card = -1; while (doContinue) { if (snd_card_next(&card) < 0) { break; } if (card < 0) { break; } sprintf(devname, ALSA_HARDWARE_CARD, card); TRACE1("Opening alsa device \"%s\"...\n", devname); err = snd_ctl_open(&handle, devname, SND_CTL_NONBLOCK); if (err < 0) { ERROR2("ERROR: snd_ctl_open, card=%d: %s\n", card, snd_strerror(err)); } else { err = snd_ctl_card_info(handle, cardinfo); if (err < 0) { ERROR2("ERROR: snd_ctl_card_info, card=%d: %s\n", card, snd_strerror(err)); } else { dev = -1; while (doContinue) { if (snd_ctl_pcm_next_device(handle, &dev) < 0) { ERROR0("snd_ctl_pcm_next_device\n"); } if (dev < 0) { break; } snd_pcm_info_set_device(pcminfo, dev); snd_pcm_info_set_subdevice(pcminfo, 0); snd_pcm_info_set_stream(pcminfo, SND_PCM_STREAM_PLAYBACK); err = snd_ctl_pcm_info(handle, pcminfo); if (err == -ENOENT) { // try with the other direction snd_pcm_info_set_stream(pcminfo, SND_PCM_STREAM_CAPTURE); err = snd_ctl_pcm_info(handle, pcminfo); } if (err < 0) { if (err != -ENOENT) { ERROR2("ERROR: snd_ctl_pcm_info, card=%d: %s", card, snd_strerror(err)); } } else { subdeviceCount = needEnumerateSubdevices(ALSA_PCM) ? snd_pcm_info_get_subdevices_count(pcminfo) : 1; if (iterator!=NULL) { for (subDev = 0; subDev < subdeviceCount; subDev++) { deviceID = encodeDeviceID(card, dev, subDev); doContinue = (*iterator)(deviceID, pcminfo, cardinfo, userData); count++; if (!doContinue) { break; } } } else { count += subdeviceCount; } } } // of while(doContinue) } snd_ctl_close(handle); } } snd_ctl_card_info_free(cardinfo); snd_pcm_info_free(pcminfo); return count; } int getAudioDeviceCount() { initAlsaSupport(); return iteratePCMDevices(NULL, NULL); } int deviceInfoIterator(UINT32 deviceID, snd_pcm_info_t* pcminfo, snd_ctl_card_info_t* cardinfo, void* userData) { char buffer[300]; ALSA_AudioDeviceDescription* desc = (ALSA_AudioDeviceDescription*)userData; #ifdef ALSA_PCM_USE_PLUGHW int usePlugHw = 1; #else int usePlugHw = 0; #endif initAlsaSupport(); if (desc->index == 0) { // we found the device with correct index *(desc->maxSimultaneousLines) = needEnumerateSubdevices(ALSA_PCM) ? 1 : snd_pcm_info_get_subdevices_count(pcminfo); *desc->deviceID = deviceID; buffer[0]=' '; buffer[1]='['; // buffer[300] is enough to store the actual device string w/o overrun getDeviceStringFromDeviceID(&buffer[2], deviceID, usePlugHw, ALSA_PCM); strncat(buffer, "]", sizeof(buffer) - strlen(buffer) - 1); strncpy(desc->name, (cardinfo != NULL) ? snd_ctl_card_info_get_id(cardinfo) : snd_pcm_info_get_id(pcminfo), desc->strLen - strlen(buffer)); strncat(desc->name, buffer, desc->strLen - strlen(desc->name)); strncpy(desc->vendor, "ALSA (http://www.alsa-project.org)", desc->strLen); strncpy(desc->description, (cardinfo != NULL) ? snd_ctl_card_info_get_name(cardinfo) : snd_pcm_info_get_name(pcminfo), desc->strLen); strncat(desc->description, ", ", desc->strLen - strlen(desc->description)); strncat(desc->description, snd_pcm_info_get_id(pcminfo), desc->strLen - strlen(desc->description)); strncat(desc->description, ", ", desc->strLen - strlen(desc->description)); strncat(desc->description, snd_pcm_info_get_name(pcminfo), desc->strLen - strlen(desc->description)); getALSAVersion(desc->version, desc->strLen); TRACE4("Returning %s, %s, %s, %s\n", desc->name, desc->vendor, desc->description, desc->version); return FALSE; // do not continue iteration } desc->index--; return TRUE; } // returns 0 if successful int openPCMfromDeviceID(int deviceID, snd_pcm_t** handle, int isSource, int hardware) { char buffer[200]; int ret; initAlsaSupport(); getDeviceStringFromDeviceID(buffer, deviceID, !hardware, ALSA_PCM); TRACE1("Opening ALSA device %s\n", buffer); ret = snd_pcm_open(handle, buffer, isSource?SND_PCM_STREAM_PLAYBACK:SND_PCM_STREAM_CAPTURE, SND_PCM_NONBLOCK); if (ret != 0) { ERROR1("snd_pcm_open returned error code %d \n", ret); *handle = NULL; } return ret; } int getAudioDeviceDescriptionByIndex(ALSA_AudioDeviceDescription* desc) { initAlsaSupport(); TRACE1(" getAudioDeviceDescriptionByIndex(mixerIndex = %d\n", desc->index); iteratePCMDevices(&deviceInfoIterator, desc); return (desc->index == 0)?TRUE:FALSE; } // returns 1 if successful // enc: 0 for PCM, 1 for ULAW, 2 for ALAW (see DirectAudio.h) int getFormatFromAlsaFormat(snd_pcm_format_t alsaFormat, int* sampleSizeInBytes, int* significantBits, int* isSigned, int* isBigEndian, int* enc) { *sampleSizeInBytes = (snd_pcm_format_physical_width(alsaFormat) + 7) / 8; *significantBits = snd_pcm_format_width(alsaFormat); // defaults *enc = 0; // PCM *isSigned = (snd_pcm_format_signed(alsaFormat) > 0); *isBigEndian = (snd_pcm_format_big_endian(alsaFormat) > 0); // non-PCM formats if (alsaFormat == SND_PCM_FORMAT_MU_LAW) { // Mu-Law *sampleSizeInBytes = 8; *enc = 1; *significantBits = *sampleSizeInBytes; } else if (alsaFormat == SND_PCM_FORMAT_A_LAW) { // A-Law *sampleSizeInBytes = 8; *enc = 2; *significantBits = *sampleSizeInBytes; } else if (snd_pcm_format_linear(alsaFormat) < 1) { return 0; } return (*sampleSizeInBytes > 0); } // returns 1 if successful int getAlsaFormatFromFormat(snd_pcm_format_t* alsaFormat, int sampleSizeInBytes, int significantBits, int isSigned, int isBigEndian, int enc) { *alsaFormat = SND_PCM_FORMAT_UNKNOWN; if (enc == 0) { *alsaFormat = snd_pcm_build_linear_format(significantBits, sampleSizeInBytes * 8, isSigned?0:1, isBigEndian?1:0); } else if ((sampleSizeInBytes == 1) && (significantBits == 8)) { if (enc == 1) { // ULAW *alsaFormat = SND_PCM_FORMAT_MU_LAW; } else if (enc == 2) { // ALAW *alsaFormat = SND_PCM_FORMAT_A_LAW; } } return (*alsaFormat == SND_PCM_FORMAT_UNKNOWN)?0:1; } /* end */