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Add host api/driver selection to PortaudioBackend

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This commit is contained in:
Tim Mayberry 2015-04-01 16:55:34 +10:00
parent 2437bbbe23
commit b6db19a5c6
4 changed files with 108 additions and 15 deletions
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29
libs/backends/portaudio/portaudio_backend.cc
View File

@ -89,10 +89,37 @@ PortAudioBackend::is_realtime () const
return true;
}
bool
PortAudioBackend::requires_driver_selection() const
{
// we could do this but implementation would need changing
/*
if (enumerate_drivers().size() == 1) {
return false;
}
*/
return true;
}
std::vector<std::string>
PortAudioBackend::enumerate_drivers () const
{
std::vector<std::string> currently_available;
_pcmio->host_api_list (currently_available);
return currently_available;
}
int
PortAudioBackend::set_driver (const std::string& name)
{
_target_driver = name;
return 0;
}
std::vector<AudioBackend::DeviceStatus>
PortAudioBackend::enumerate_devices () const
{
_pcmio->discover();
_pcmio->discover(_target_driver);
_audio_device_status.clear();
std::map<int, std::string> devices;
_pcmio->device_list(devices);

5
libs/backends/portaudio/portaudio_backend.h
View File

@ -160,6 +160,10 @@ class PortAudioBackend : public AudioBackend {
std::string name () const;
bool is_realtime () const;
bool requires_driver_selection() const;
std::vector<std::string> enumerate_drivers () const;
int set_driver (const std::string&);
std::vector<DeviceStatus> enumerate_devices () const;
std::vector<float> available_sample_rates (const std::string& device) const;
std::vector<uint32_t> available_buffer_sizes (const std::string& device) const;
@ -313,6 +317,7 @@ class PortAudioBackend : public AudioBackend {
static std::vector<AudioBackend::DeviceStatus> _audio_device_status;
static std::vector<AudioBackend::DeviceStatus> _midi_device_status;
std::string _target_driver;
mutable std::string _audio_device;
std::string _midi_driver_option;

80
libs/backends/portaudio/portaudio_io.cc
View File

@ -133,28 +133,80 @@ PortAudioIO::device_list (std::map<int, std::string> &devices) const {
}
}
void
PortAudioIO::discover()
bool
PortAudioIO::initialize_pa ()
{
for (std::map<int, paDevice*>::const_iterator i = _devices.begin (); i != _devices.end(); ++i) {
delete i->second;
}
_devices.clear();
PaError err = paNoError;
if (!_initialized) {
err = Pa_Initialize();
}
if (err != paNoError) {
return;
if (err != paNoError) {
return false;
}
_initialized = true;
}
_initialized = true;
return true;
}
void
PortAudioIO::host_api_list (std::vector<std::string>& api_list)
{
if (!initialize_pa()) return;
PaHostApiIndex count = Pa_GetHostApiCount();
if (count < 0) return;
for (int i = 0; i < count; ++i) {
const PaHostApiInfo* info = Pa_GetHostApiInfo (i);
if (info->name != NULL) { // possible?
api_list.push_back (info->name);
}
}
}
PaHostApiIndex
PortAudioIO::get_host_api_index_from_name (const std::string& name)
{
if (!initialize_pa()) return -1;
PaHostApiIndex count = Pa_GetHostApiCount();
if (count < 0) return -1;
for (int i = 0; i < count; ++i) {
const PaHostApiInfo* info = Pa_GetHostApiInfo (i);
if (info->name != NULL) { // possible?
if (name == info->name) return i;
}
}
return -1;
}
void
PortAudioIO::discover(const std::string& host_api)
{
if (!initialize_pa()) return;
for (std::map<int, paDevice*>::const_iterator i = _devices.begin (); i != _devices.end(); ++i) {
delete i->second;
}
_devices.clear();
PaHostApiIndex host_api_index = get_host_api_index_from_name (host_api);
if (host_api_index < 0) return;
const PaHostApiInfo* info = Pa_GetHostApiInfo (host_api_index);
if (info == NULL) return;
PaDeviceIndex default_input = info->defaultInputDevice;
PaDeviceIndex default_output = info->defaultOutputDevice;
{
const PaDeviceInfo* nfo_i = Pa_GetDeviceInfo(Pa_GetDefaultInputDevice());
const PaDeviceInfo* nfo_o = Pa_GetDeviceInfo(Pa_GetDefaultOutputDevice());
const PaDeviceInfo* nfo_i = Pa_GetDeviceInfo(default_input);
const PaDeviceInfo* nfo_o = Pa_GetDeviceInfo(default_output);
if (nfo_i && nfo_o) {
_devices.insert (std::pair<int, paDevice*> (-1,
new paDevice("Default",
@ -171,7 +223,9 @@ PortAudioIO::discover()
for (int i = 0 ; i < n_devices; ++i) {
const PaDeviceInfo* nfo = Pa_GetDeviceInfo(i);
if (!nfo) continue;
if (nfo->hostApi != host_api_index) continue;
#ifndef NDEBUG
printf(" (%d) '%s' in: %d (lat: %.1f .. %.1f) out: %d (lat: %.1f .. %.1f) sr:%.2f\n",
i, nfo->name,

9
libs/backends/portaudio/portaudio_io.h
View File

@ -37,7 +37,12 @@ public:
int state (void) const { return _state; }
void discover();
bool initialize_pa ();
void host_api_list (std::vector<std::string>&);
PaHostApiIndex get_host_api_index_from_name (const std::string& name);
void discover(const std::string& host_api);
void device_list (std::map<int, std::string> &devices) const;
int available_sample_rates (int device_id, std::vector<float>& sampleRates);
@ -96,6 +101,8 @@ private:
};
std::map<int, paDevice *> _devices;
std::string _host_api;
};
} // namespace