static int getMIDIDeviceDescriptionByIndex(snd_rawmidi_stream_t direction,
ALSA_MIDIDeviceDescription* desc) {
initAlsaSupport();
TRACE1(" getMIDIDeviceDescriptionByIndex (index = %d)\n", desc->index);
iterateRawmidiDevices(direction, &deviceInfoIterator, desc);
return (desc->index == 0) ? MIDI_SUCCESS : MIDI_INVALID_DEVICEID;
}
INT32 PORT_GetPortMixerCount() {
INT32 mixerCount;
int card;
char devname[16];
int err;
snd_ctl_t *handle;
snd_ctl_card_info_t* info;
TRACE0("> PORT_GetPortMixerCount\n");
initAlsaSupport();
snd_ctl_card_info_malloc(&info);
card = -1;
mixerCount = 0;
if (snd_card_next(&card) >= 0) {
while (card >= 0) {
sprintf(devname, ALSA_HARDWARE_CARD, card);
TRACE1("PORT_GetPortMixerCount: Opening alsa device \"%s\"...\n", devname);
err = snd_ctl_open(&handle, devname, 0);
if (err < 0) {
ERROR2("ERROR: snd_ctl_open, card=%d: %s\n", card, snd_strerror(err));
} else {
mixerCount++;
snd_ctl_close(handle);
}
if (snd_card_next(&card) < 0) {
break;
}
}
}
snd_ctl_card_info_free(info);
TRACE0("< PORT_GetPortMixerCount\n");
return mixerCount;
}
int getMidiDeviceCount(snd_rawmidi_stream_t direction) {
int deviceCount;
TRACE0("> getMidiDeviceCount()\n");
initAlsaSupport();
deviceCount = iterateRawmidiDevices(direction, NULL, NULL);
TRACE0("< getMidiDeviceCount()\n");
return deviceCount;
}
// 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;
}
/*
userData is assumed to be a pointer to ALSA_MIDIDeviceDescription.
ALSA_MIDIDeviceDescription->index has to be set to the index of the device
we want to get information of before this method is called the first time via
iterateRawmidiDevices(). On each call of this method,
ALSA_MIDIDeviceDescription->index is decremented. If it is equal to zero,
we have reached the desired device, so action is taken.
So after successful completion of iterateRawmidiDevices(),
ALSA_MIDIDeviceDescription->index is zero. If it isn't, this is an
indication of an error.
*/
static int deviceInfoIterator(UINT32 deviceID, snd_rawmidi_info_t *rawmidi_info,
snd_ctl_card_info_t *cardinfo, void *userData) {
char buffer[300];
ALSA_MIDIDeviceDescription* desc = (ALSA_MIDIDeviceDescription*)userData;
#ifdef ALSA_MIDI_USE_PLUGHW
int usePlugHw = 1;
#else
int usePlugHw = 0;
#endif
TRACE0("deviceInfoIterator\n");
initAlsaSupport();
if (desc->index == 0) {
// we found the device with correct index
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_RAWMIDI);
strncat(buffer, "]", sizeof(buffer) - strlen(buffer) - 1);
strncpy(desc->name,
(cardinfo != NULL)
? snd_ctl_card_info_get_id(cardinfo)
: snd_rawmidi_info_get_id(rawmidi_info),
desc->strLen - strlen(buffer));
strncat(desc->name, buffer, desc->strLen - strlen(desc->name));
desc->description[0] = 0;
if (cardinfo != NULL) {
strncpy(desc->description, snd_ctl_card_info_get_name(cardinfo),
desc->strLen);
strncat(desc->description, ", ",
desc->strLen - strlen(desc->description));
}
strncat(desc->description, snd_rawmidi_info_get_id(rawmidi_info),
desc->strLen - strlen(desc->description));
strncat(desc->description, ", ", desc->strLen - strlen(desc->description));
strncat(desc->description, snd_rawmidi_info_get_name(rawmidi_info),
desc->strLen - strlen(desc->description));
TRACE2("Returning %s, %s\n", desc->name, desc->description);
return FALSE; // do not continue iteration
}
desc->index--;
return TRUE;
}
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;
}
int getAudioDeviceDescriptionByIndex(ALSA_AudioDeviceDescription* desc) {
initAlsaSupport();
TRACE1(" getAudioDeviceDescriptionByIndex(mixerIndex = %d\n", desc->index);
iteratePCMDevices(&deviceInfoIterator, desc);
return (desc->index == 0)?TRUE:FALSE;
}
int getAudioDeviceCount() {
initAlsaSupport();
return iteratePCMDevices(NULL, NULL);
}
