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Alsa Sequencer Tests

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This commit is contained in:
Robin E. R. Davies
2025-06-27 14:24:58 -04:00
parent f0628c2cce
commit acb668853b
17 changed files with 754 additions and 98 deletions
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src/PiPedalAlsa.cpp
+215 -3
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@@ -47,6 +47,7 @@ void PiPedalAlsaDevices::cacheDevice(const std::string &name, const AlsaDeviceIn
std::vector<AlsaDeviceInfo> PiPedalAlsaDevices::GetAlsaDevices()
{
std::lock_guard guard{alsaMutex};
std::vector<AlsaDeviceInfo> result;
@@ -118,7 +119,7 @@ std::vector<AlsaDeviceInfo> PiPedalAlsaDevices::GetAlsaDevices()
if (err == 0)
{
unsigned int minRate = 0, maxRate = 0;
snd_pcm_uframes_t minBufferSize = 0, maxBufferSize = 0;
snd_pcm_uframes_t minBufferSize = 0, maxBufferSize = 0;
int dir;
err = snd_pcm_hw_params_get_rate_min(params, &minRate, &dir);
if (err == 0)
@@ -143,7 +144,8 @@ std::vector<AlsaDeviceInfo> PiPedalAlsaDevices::GetAlsaDevices()
info.sampleRates_.push_back(rate);
}
}
if (minBufferSize < 16) {
if (minBufferSize < 16)
{
minBufferSize = 16;
}
@@ -180,7 +182,207 @@ std::vector<AlsaDeviceInfo> PiPedalAlsaDevices::GetAlsaDevices()
return result;
}
static std::vector<AlsaMidiDeviceInfo> GetAlsaDevices(const char *devname, const char *direction)
static void AddMidiCardDevicesToList(snd_ctl_t *ctl, int card, int device, AlsaMidiDeviceInfo::Direction direction, std::vector<AlsaMidiDeviceInfo> *result)
{
snd_rawmidi_info_t *info = nullptr;
const char *name = nullptr;
const char *sub_name = nullptr;
int subs = 0, subs_in = 0, subs_out = 0;
int sub = 0;
int err = 0;
;
snd_rawmidi_info_alloca(&info);
snd_rawmidi_info_set_device(info, device);
snd_rawmidi_info_set_stream(info, SND_RAWMIDI_STREAM_INPUT);
err = snd_ctl_rawmidi_info(ctl, info);
if (err >= 0)
subs_in = snd_rawmidi_info_get_subdevices_count(info);
else
subs_in = 0;
snd_rawmidi_info_set_stream(info, SND_RAWMIDI_STREAM_OUTPUT);
err = snd_ctl_rawmidi_info(ctl, info);
if (err >= 0)
subs_out = snd_rawmidi_info_get_subdevices_count(info);
else
subs_out = 0;
subs = subs_in > subs_out ? subs_in : subs_out;
if (!subs)
return;
switch (direction)
{
case AlsaMidiDeviceInfo::In:
if (subs_out == 0) // out for the device, in for us.
{
return; // no input devices to add
}
break;
case AlsaMidiDeviceInfo::Out: // in for the device, out for us.
if (subs_in == 0)
{
return; // no output devices to add
}
break;
case AlsaMidiDeviceInfo::InOut:
if (subs_in == 0 || subs_out == 0)
{
return; // no input or output devices to add
}
break;
case AlsaMidiDeviceInfo::None:
return; // no devices to add
}
for (sub = 0; sub < subs; ++sub)
{
snd_rawmidi_info_set_stream(info, direction == AlsaMidiDeviceInfo::Direction::Out ? SND_RAWMIDI_STREAM_INPUT : SND_RAWMIDI_STREAM_OUTPUT);
snd_rawmidi_info_set_subdevice(info, sub);
err = snd_ctl_rawmidi_info(ctl, info);
if (err < 0)
{
throw std::runtime_error(
SS("snd_ctl_rawmidi_info failed for card " << card << ", device " << device << ", subdevice " << sub << ": " << snd_strerror(err)));
}
name = snd_rawmidi_info_get_name(info);
sub_name = snd_rawmidi_info_get_subdevice_name(info);
// get card name.
std::string cardName;
snd_ctl_card_info_t *card_info = nullptr;
snd_ctl_card_info_malloc(&card_info);
if (snd_ctl_card_info(ctl, card_info) == 0) {
cardName = snd_ctl_card_info_get_name(card_info);
}
snd_ctl_card_info_free(card_info);
if (cardName.length() == 0)
{
return;
}
if (sub == 0 && sub_name[0] == '\0')
{
AlsaMidiDeviceInfo info;
info.name_ = SS("hw:CARD=" << cardName << ",DEV=" << device);
info.description_ = SS("Virtual MIDI " << card << "-" << device);
info.card_ = card;
info.device_ = device;
info.subdevice_ = 0;
info.isVirtual_ = true;
info.subDevices_ = subs;
if (subs_in > 0 && subs_out > 0)
{
info.direction_ = AlsaMidiDeviceInfo::InOut;
}
else if (subs_in > 0)
{
info.direction_ = AlsaMidiDeviceInfo::In;
}
else if (subs_out > 0)
{
info.direction_ = AlsaMidiDeviceInfo::Out;
}
else
{
info.direction_ = AlsaMidiDeviceInfo::None;
}
result->push_back(info);
break;
}
else
{
AlsaMidiDeviceInfo info;
info.name_ = SS("hw:CARD=" << cardName << ",DEV=" << device);
if (sub != 0) {
info.name_ = SS(info.name_ << "," << sub);
}
info.description_ = sub_name;
info.card_ = card;
info.device_ = device;
info.subdevice_ = sub;
info.isVirtual_ = false;
info.subDevices_ = 1;
result->push_back(info);
}
}
}
static void AddMidiCardToList(int card, std::vector<AlsaMidiDeviceInfo> *result, AlsaMidiDeviceInfo::Direction direction)
{
snd_ctl_t *ctl = nullptr;
char name[32];
int device;
int err;
sprintf(name, "hw:%d", card);
if ((err = snd_ctl_open(&ctl, name, 0)) < 0)
{
throw std::runtime_error(SS("cannot open control for card " << card << ": " << snd_strerror(err)));
}
device = -1;
for (;;)
{
if ((err = snd_ctl_rawmidi_next_device(ctl, &device)) < 0)
{
snd_ctl_close(ctl);
throw std::runtime_error(SS("cannot get next rawmidi device for card " << card << ": " << snd_strerror(err)));
}
if (device < 0)
break;
AddMidiCardDevicesToList(ctl, card, device, direction, result);
}
snd_ctl_close(ctl);
}
static std::vector<AlsaMidiDeviceInfo> GetAlsaDevices(const char *devname, const char *direction_)
{
std::vector<AlsaMidiDeviceInfo> result;
int card, err;
AlsaMidiDeviceInfo::Direction direction;
if (strcmp(direction_, "Input") == 0)
{
direction = AlsaMidiDeviceInfo::In;
}
else if (strcmp(direction_, "Output") == 0)
{
direction = AlsaMidiDeviceInfo::Out;
}
else if (strcmp(direction_, "InOut") == 0)
{
direction = AlsaMidiDeviceInfo::InOut;
}
else
{
direction = AlsaMidiDeviceInfo::None;
return result;
}
card = -1;
if ((err = snd_card_next(&card)) < 0)
{
throw std::runtime_error(SS("snd_card_next failed.: " << snd_strerror(err)));
}
if (card < 0)
{
// no devices!
return result;
}
do
{
AddMidiCardToList(card, &result, direction);
if ((err = snd_card_next(&card)) < 0)
{
throw std::runtime_error(SS("snd_card_next failed: " << snd_strerror(err)));
}
} while (card >= 0);
return result;
}
static std::vector<AlsaMidiDeviceInfo> OldGetAlsaDevices(const char *devname, const char *direction)
{
std::vector<AlsaMidiDeviceInfo> result;
{
@@ -214,6 +416,8 @@ static std::vector<AlsaMidiDeviceInfo> GetAlsaDevices(const char *devname, const
result.push_back(AlsaMidiDeviceInfo(name, desc));
}
}
// translate rawmidi device name to device number.
if (name && strcmp("null", name) != 0)
free(name);
if (desc && strcmp("null", desc) != 0)
@@ -260,6 +464,14 @@ AlsaMidiDeviceInfo::AlsaMidiDeviceInfo(const char *name, const char *description
}
}
AlsaMidiDeviceInfo::AlsaMidiDeviceInfo(const char *name, const char *description, int card, int device, int subdevice)
: AlsaMidiDeviceInfo(name, description)
{
this->card_ = card;
this->device_ = device;
this->subdevice_ = subdevice;
}
JSON_MAP_BEGIN(AlsaDeviceInfo)
JSON_MAP_REFERENCE(AlsaDeviceInfo, cardId)
JSON_MAP_REFERENCE(AlsaDeviceInfo, id)