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; }
// 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; }
// for each ALSA device, call iterator. userData is passed to the iterator // returns total number of iterations static int iterateRawmidiDevices(snd_rawmidi_stream_t direction, DeviceIteratorPtr iterator, void* userData) { int count = 0; int subdeviceCount; int card, dev, subDev; char devname[16]; int err; snd_ctl_t *handle; snd_rawmidi_t *rawmidi; snd_rawmidi_info_t *rawmidi_info; snd_ctl_card_info_t *card_info, *defcardinfo = NULL; UINT32 deviceID; int doContinue = TRUE; snd_rawmidi_info_malloc(&rawmidi_info); snd_ctl_card_info_malloc(&card_info); // 1st try "default" device if (direction == SND_RAWMIDI_STREAM_INPUT) { err = snd_rawmidi_open(&rawmidi, NULL, ALSA_DEFAULT_DEVICE_NAME, SND_RAWMIDI_NONBLOCK); } else if (direction == SND_RAWMIDI_STREAM_OUTPUT) { err = snd_rawmidi_open(NULL, &rawmidi, ALSA_DEFAULT_DEVICE_NAME, SND_RAWMIDI_NONBLOCK); } else { ERROR0("ERROR: iterateRawmidiDevices(): direction is neither" " SND_RAWMIDI_STREAM_INPUT nor SND_RAWMIDI_STREAM_OUTPUT\n"); err = MIDI_INVALID_ARGUMENT; } if (err < 0) { ERROR1("ERROR: snd_rawmidi_open (\"default\"): %s\n", snd_strerror(err)); } else { err = snd_rawmidi_info(rawmidi, rawmidi_info); snd_rawmidi_close(rawmidi); if (err < 0) { ERROR1("ERROR: snd_rawmidi_info (\"default\"): %s\n", snd_strerror(err)); } else { // try to get card info card = snd_rawmidi_info_get_card(rawmidi_info); 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, card_info) >= 0) { defcardinfo = card_info; } snd_ctl_close(handle); } } // call calback function for the device if (iterator != NULL) { doContinue = (*iterator)(ALSA_DEFAULT_DEVICE_ID, rawmidi_info, defcardinfo, userData); } count++; } } // iterate cards card = -1; TRACE0("testing for cards...\n"); if (snd_card_next(&card) >= 0) { TRACE1("Found card %d\n", card); while (doContinue && (card >= 0)) { sprintf(devname, ALSA_HARDWARE_CARD, card); TRACE1("Opening control for alsa rawmidi 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 { TRACE0("snd_ctl_open() SUCCESS\n"); err = snd_ctl_card_info(handle, card_info); if (err < 0) { ERROR2("ERROR: snd_ctl_card_info, card=%d: %s\n", card, snd_strerror(err)); } else { TRACE0("snd_ctl_card_info() SUCCESS\n"); dev = -1; while (doContinue) { if (snd_ctl_rawmidi_next_device(handle, &dev) < 0) { ERROR0("snd_ctl_rawmidi_next_device\n"); } TRACE0("snd_ctl_rawmidi_next_device() SUCCESS\n"); if (dev < 0) { break; } snd_rawmidi_info_set_device(rawmidi_info, dev); snd_rawmidi_info_set_subdevice(rawmidi_info, 0); snd_rawmidi_info_set_stream(rawmidi_info, direction); err = snd_ctl_rawmidi_info(handle, rawmidi_info); TRACE0("after snd_ctl_rawmidi_info()\n"); if (err < 0) { if (err != -ENOENT) { ERROR2("ERROR: snd_ctl_rawmidi_info, card=%d: %s", card, snd_strerror(err)); } } else { TRACE0("snd_ctl_rawmidi_info() SUCCESS\n"); subdeviceCount = needEnumerateSubdevices(ALSA_RAWMIDI) ? snd_rawmidi_info_get_subdevices_count(rawmidi_info) : 1; if (iterator!=NULL) { for (subDev = 0; subDev < subdeviceCount; subDev++) { TRACE3(" Iterating %d,%d,%d\n", card, dev, subDev); deviceID = encodeDeviceID(card, dev, subDev); doContinue = (*iterator)(deviceID, rawmidi_info, card_info, userData); count++; TRACE0("returned from iterator\n"); if (!doContinue) { break; } } } else { count += subdeviceCount; } } } // of while(doContinue) } snd_ctl_close(handle); } if (snd_card_next(&card) < 0) { break; } } } else { ERROR0("No cards found!\n"); } snd_ctl_card_info_free(card_info); snd_rawmidi_info_free(rawmidi_info); return count; }