export ARDOUR_MIDIMAPS_PATH=$TOP/midi_maps:.
export ARDOUR_MCP_PATH=$TOP/mcp:.
export ARDOUR_EXPORT_FORMATS_PATH=$TOP/export:.
-export ARDOUR_BACKEND_PATH=$libs/backends/jack:$libs/backends/wavesaudio:$libs/backends/dummy
+export ARDOUR_BACKEND_PATH=$libs/backends/jack:$libs/backends/wavesaudio:$libs/backends/dummy:$libs/backends/alsa
export ARDOUR_TEST_PATH=$libs/ardour/test/data
#
--- /dev/null
+/*
+ * Copyright (C) 2014 Robin Gareus <robin@gareus.org>
+ * Copyright (C) 2013 Paul Davis
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <regex.h>
+#include <sys/mman.h>
+#include <sys/time.h>
+
+#include <glibmm.h>
+
+#include "alsa_audiobackend.h"
+#include "rt_thread.h"
+
+#include "pbd/error.h"
+#include "ardour/port_manager.h"
+#include "i18n.h"
+
+using namespace ARDOUR;
+
+static std::string s_instance_name;
+size_t AlsaAudioBackend::_max_buffer_size = 8192;
+
+AlsaAudioBackend::AlsaAudioBackend (AudioEngine& e, AudioBackendInfo& info)
+ : AudioBackend (e, info)
+ , _pcmi (0)
+ , _running (false)
+ , _freewheeling (false)
+ , _capture_device("")
+ , _playback_device("")
+ , _samplerate (48000)
+ , _samples_per_period (1024)
+ , _periods_per_cycle (2)
+ , _dsp_load (0)
+ , _n_inputs (0)
+ , _n_outputs (0)
+ , _n_midi_inputs (0)
+ , _n_midi_outputs (0)
+ , _systemic_input_latency (0)
+ , _systemic_output_latency (0)
+ , _processed_samples (0)
+{
+ _instance_name = s_instance_name;
+ pthread_mutex_init (&_port_callback_mutex, 0);
+}
+
+AlsaAudioBackend::~AlsaAudioBackend ()
+{
+ pthread_mutex_destroy (&_port_callback_mutex);
+}
+
+/* AUDIOBACKEND API */
+
+std::string
+AlsaAudioBackend::name () const
+{
+ return X_("ALSA");
+}
+
+bool
+AlsaAudioBackend::is_realtime () const
+{
+ return true;
+}
+
+std::vector<AudioBackend::DeviceStatus>
+AlsaAudioBackend::enumerate_devices () const
+{
+ std::vector<AudioBackend::DeviceStatus> s;
+ int cardnum = -1;
+ snd_ctl_card_info_t *info;
+ snd_ctl_card_info_alloca (&info);
+
+ // TODO re-use code from libs/backends/jack/jack_utils.cc
+ while (snd_card_next (&cardnum) >= 0 && cardnum >= 0) {
+ snd_ctl_t *handle;
+
+ std::string devname = "hw:";
+ devname += PBD::to_string (cardnum, std::dec);
+
+ if (snd_ctl_open (&handle, devname.c_str(), 0) >= 0 && snd_ctl_card_info (handle, info) >= 0) {
+ //string card_name = snd_ctl_card_info_get_name (info);
+ int device = -1;
+ if (snd_ctl_pcm_next_device (handle, &device) >= 0 && device >= 0) {
+ s.push_back (DeviceStatus (devname, true));
+ }
+ snd_ctl_close(handle);
+ }
+ }
+ return s;
+}
+
+std::vector<float>
+AlsaAudioBackend::available_sample_rates (const std::string&) const
+{
+ std::vector<float> sr;
+ sr.push_back (8000.0);
+ sr.push_back (22050.0);
+ sr.push_back (24000.0);
+ sr.push_back (44100.0);
+ sr.push_back (48000.0);
+ sr.push_back (88200.0);
+ sr.push_back (96000.0);
+ sr.push_back (176400.0);
+ sr.push_back (192000.0);
+ return sr;
+}
+
+std::vector<uint32_t>
+AlsaAudioBackend::available_buffer_sizes (const std::string&) const
+{
+ std::vector<uint32_t> bs;
+ bs.push_back (32);
+ bs.push_back (64);
+ bs.push_back (128);
+ bs.push_back (256);
+ bs.push_back (512);
+ bs.push_back (1024);
+ bs.push_back (2048);
+ bs.push_back (4096);
+ bs.push_back (8192);
+ return bs;
+}
+
+uint32_t
+AlsaAudioBackend::available_input_channel_count (const std::string&) const
+{
+ return 128; // TODO query current device
+}
+
+uint32_t
+AlsaAudioBackend::available_output_channel_count (const std::string&) const
+{
+ return 128; // TODO query current device
+}
+
+bool
+AlsaAudioBackend::can_change_sample_rate_when_running () const
+{
+ return false;
+}
+
+bool
+AlsaAudioBackend::can_change_buffer_size_when_running () const
+{
+ return false;
+}
+
+int
+AlsaAudioBackend::set_device_name (const std::string& d)
+{
+ _capture_device = d;
+ _playback_device = d;
+ return 0;
+}
+
+int
+AlsaAudioBackend::set_sample_rate (float sr)
+{
+ if (sr <= 0) { return -1; }
+ _samplerate = sr;
+ engine.sample_rate_change (sr);
+ return 0;
+}
+
+int
+AlsaAudioBackend::set_buffer_size (uint32_t bs)
+{
+ if (bs <= 0 || bs >= _max_buffer_size) {
+ return -1;
+ }
+ _samples_per_period = bs;
+ engine.buffer_size_change (bs);
+ return 0;
+}
+
+int
+AlsaAudioBackend::set_interleaved (bool yn)
+{
+ if (!yn) { return 0; }
+ return -1;
+}
+
+int
+AlsaAudioBackend::set_input_channels (uint32_t cc)
+{
+ _n_inputs = cc;
+ return 0;
+}
+
+int
+AlsaAudioBackend::set_output_channels (uint32_t cc)
+{
+ _n_outputs = cc;
+ return 0;
+}
+
+int
+AlsaAudioBackend::set_systemic_input_latency (uint32_t sl)
+{
+ _systemic_input_latency = sl;
+ return 0;
+}
+
+int
+AlsaAudioBackend::set_systemic_output_latency (uint32_t sl)
+{
+ _systemic_output_latency = sl;
+ return 0;
+}
+
+/* Retrieving parameters */
+std::string
+AlsaAudioBackend::device_name () const
+{
+ return _capture_device;
+}
+
+float
+AlsaAudioBackend::sample_rate () const
+{
+ return _samplerate;
+}
+
+uint32_t
+AlsaAudioBackend::buffer_size () const
+{
+ return _samples_per_period;
+}
+
+bool
+AlsaAudioBackend::interleaved () const
+{
+ return false;
+}
+
+uint32_t
+AlsaAudioBackend::input_channels () const
+{
+ return _n_inputs;
+}
+
+uint32_t
+AlsaAudioBackend::output_channels () const
+{
+ return _n_outputs;
+}
+
+uint32_t
+AlsaAudioBackend::systemic_input_latency () const
+{
+ return _systemic_input_latency;
+}
+
+uint32_t
+AlsaAudioBackend::systemic_output_latency () const
+{
+ return _systemic_output_latency;
+}
+
+/* MIDI */
+std::vector<std::string>
+AlsaAudioBackend::enumerate_midi_options () const
+{
+ std::vector<std::string> m;
+ m.push_back (_("-None-"));
+ return m;
+}
+
+int
+AlsaAudioBackend::set_midi_option (const std::string& /* opt*/)
+{
+ return -1;
+}
+
+std::string
+AlsaAudioBackend::midi_option () const
+{
+ return "";
+}
+
+/* State Control */
+
+static void * pthread_process (void *arg)
+{
+ AlsaAudioBackend *d = static_cast<AlsaAudioBackend *>(arg);
+ d->main_process_thread ();
+ pthread_exit (0);
+ return 0;
+}
+
+int
+AlsaAudioBackend::_start (bool for_latency_measurement)
+{
+ if (_running) {
+ PBD::error << _("AlsaAudioBackend: already active.") << endmsg;
+ return -1;
+ }
+
+ if (_ports.size()) {
+ PBD::warning << _("AlsaAudioBackend: recovering from unclean shutdown, port registry is not empty.") << endmsg;
+ _system_inputs.clear();
+ _system_outputs.clear();
+ _ports.clear();
+ }
+
+ assert(_pcmi == 0);
+
+ _pcmi = new Alsa_pcmi (_capture_device.c_str(), _playback_device.c_str(), 0, _samplerate, _samples_per_period, _periods_per_cycle, 0);
+ if (_pcmi->state ()) {
+ PBD::error << _("AlsaAudioBackend: failed to open device (see stderr for details).") << endmsg;
+ delete _pcmi; _pcmi = 0;
+ return -1;
+ }
+
+#ifndef NDEBUG
+ _pcmi->printinfo ();
+#endif
+
+ if (_n_outputs != _pcmi->nplay ()) {
+ if (_n_outputs == 0) {
+ _n_outputs = _pcmi->nplay ();
+ } else {
+ _n_outputs = std::min (_n_outputs, _pcmi->nplay ());
+ }
+ PBD::warning << _("AlsaAudioBackend: adjusted output channel count to match device.") << endmsg;
+ }
+
+ if (_n_inputs != _pcmi->ncapt ()) {
+ if (_n_inputs == 0) {
+ _n_inputs = _pcmi->ncapt ();
+ } else {
+ _n_inputs = std::min (_n_inputs, _pcmi->ncapt ());
+ }
+ PBD::warning << _("AlsaAudioBackend: adjusted input channel count to match device.") << endmsg;
+ }
+
+ if (_pcmi->fsize() != _samples_per_period) {
+ _samples_per_period = _pcmi->fsize();
+ PBD::warning << _("AlsaAudioBackend: samples per period does not match.") << endmsg;
+ }
+
+ if (_pcmi->fsamp() != _samplerate) {
+ _samplerate = _pcmi->fsamp();
+ engine.sample_rate_change (_samplerate);
+ PBD::warning << _("AlsaAudioBackend: sample rate does not match.") << endmsg;
+ }
+
+ if (for_latency_measurement) {
+ _systemic_input_latency = 0;
+ _systemic_output_latency = 0;
+ }
+
+ if (register_system_ports()) {
+ PBD::error << _("AlsaAudioBackend: failed to register system ports.") << endmsg;
+ delete _pcmi; _pcmi = 0;
+ return -1;
+ }
+
+ if (engine.reestablish_ports ()) {
+ PBD::error << _("AlsaAudioBackend: Could not re-establish ports.") << endmsg;
+ delete _pcmi; _pcmi = 0;
+ return -1;
+ }
+
+ engine.buffer_size_change (_samples_per_period);
+ engine.reconnect_ports ();
+
+ if (_realtime_pthread_create (SCHED_FIFO, -20,
+ &_main_thread, pthread_process, this))
+ {
+ if (pthread_create (&_main_thread, NULL, pthread_process, this))
+ {
+ PBD::error << _("AlsaAudioBackend: failed to create process thread.") << endmsg;
+ delete _pcmi; _pcmi = 0;
+ return -1;
+ } else {
+ PBD::warning << _("AlsaAudioBackend: cannot acquire realtime permissions.") << endmsg;
+ }
+ }
+
+ int timeout = 5000;
+ while (!_running && --timeout > 0) { Glib::usleep (1000); }
+
+ if (timeout == 0 || !_running) {
+ PBD::error << _("AlsaAudioBackend: failed to start process thread.") << endmsg;
+ delete _pcmi; _pcmi = 0;
+ return -1;
+ }
+
+ return 0;
+}
+
+int
+AlsaAudioBackend::stop ()
+{
+ void *status;
+ if (!_running) {
+ return 0;
+ }
+
+ _running = false;
+ if (pthread_join (_main_thread, &status)) {
+ PBD::error << _("AlsaAudioBackend: failed to terminate.") << endmsg;
+ return -1;
+ }
+ unregister_system_ports();
+ delete _pcmi; _pcmi = 0;
+ return 0;
+}
+
+int
+AlsaAudioBackend::freewheel (bool onoff)
+{
+ if (onoff == _freewheeling) {
+ return 0;
+ }
+ _freewheeling = onoff;
+ engine.freewheel_callback (onoff);
+ return 0;
+}
+
+float
+AlsaAudioBackend::dsp_load () const
+{
+ return 100.f * _dsp_load;
+}
+
+size_t
+AlsaAudioBackend::raw_buffer_size (DataType t)
+{
+ switch (t) {
+ case DataType::AUDIO:
+ return _samples_per_period * sizeof(Sample);
+ case DataType::MIDI:
+ return _max_buffer_size; // XXX not really limited
+ }
+ return 0;
+}
+
+/* Process time */
+pframes_t
+AlsaAudioBackend::sample_time ()
+{
+ return _processed_samples;
+}
+
+pframes_t
+AlsaAudioBackend::sample_time_at_cycle_start ()
+{
+ return _processed_samples;
+}
+
+pframes_t
+AlsaAudioBackend::samples_since_cycle_start ()
+{
+ return 0;
+}
+
+
+void *
+AlsaAudioBackend::alsa_process_thread (void *arg)
+{
+ ThreadData* td = reinterpret_cast<ThreadData*> (arg);
+ boost::function<void ()> f = td->f;
+ delete td;
+ f ();
+ return 0;
+}
+
+int
+AlsaAudioBackend::create_process_thread (boost::function<void()> func)
+{
+ pthread_t thread_id;
+ pthread_attr_t attr;
+ size_t stacksize = 100000;
+
+ pthread_attr_init (&attr);
+ pthread_attr_setstacksize (&attr, stacksize);
+ ThreadData* td = new ThreadData (this, func, stacksize);
+
+ if (pthread_create (&thread_id, &attr, alsa_process_thread, td)) {
+ PBD::error << _("AudioEngine: cannot create process thread.") << endmsg;
+ pthread_attr_destroy (&attr);
+ return -1;
+ }
+ pthread_attr_destroy (&attr);
+
+ _threads.push_back (thread_id);
+ return 0;
+}
+
+int
+AlsaAudioBackend::join_process_threads ()
+{
+ int rv = 0;
+
+ for (std::vector<pthread_t>::const_iterator i = _threads.begin (); i != _threads.end (); ++i)
+ {
+ void *status;
+ if (pthread_join (*i, &status)) {
+ PBD::error << _("AudioEngine: cannot terminate process thread.") << endmsg;
+ rv -= 1;
+ }
+ }
+ _threads.clear ();
+ return rv;
+}
+
+bool
+AlsaAudioBackend::in_process_thread ()
+{
+ for (std::vector<pthread_t>::const_iterator i = _threads.begin (); i != _threads.end (); ++i)
+ {
+ if (pthread_equal (*i, pthread_self ()) != 0) {
+ return true;
+ }
+ }
+ return false;
+}
+
+uint32_t
+AlsaAudioBackend::process_thread_count ()
+{
+ return _threads.size ();
+}
+
+void
+AlsaAudioBackend::update_latencies ()
+{
+}
+
+/* PORTENGINE API */
+
+void*
+AlsaAudioBackend::private_handle () const
+{
+ return NULL;
+}
+
+const std::string&
+AlsaAudioBackend::my_name () const
+{
+ return _instance_name;
+}
+
+bool
+AlsaAudioBackend::available () const
+{
+ return true;
+}
+
+uint32_t
+AlsaAudioBackend::port_name_size () const
+{
+ return 256;
+}
+
+int
+AlsaAudioBackend::set_port_name (PortEngine::PortHandle port, const std::string& name)
+{
+ if (!valid_port (port)) {
+ PBD::error << _("AlsaBackend::set_port_name: Invalid Port(s)") << endmsg;
+ return -1;
+ }
+ return static_cast<AlsaPort*>(port)->set_name (_instance_name + ":" + name);
+}
+
+std::string
+AlsaAudioBackend::get_port_name (PortEngine::PortHandle port) const
+{
+ if (!valid_port (port)) {
+ PBD::error << _("AlsaBackend::get_port_name: Invalid Port(s)") << endmsg;
+ return std::string ();
+ }
+ return static_cast<AlsaPort*>(port)->name ();
+}
+
+PortEngine::PortHandle
+AlsaAudioBackend::get_port_by_name (const std::string& name) const
+{
+ PortHandle port = (PortHandle) find_port (name);
+ return port;
+}
+
+int
+AlsaAudioBackend::get_ports (
+ const std::string& port_name_pattern,
+ DataType type, PortFlags flags,
+ std::vector<std::string>& port_names) const
+{
+ int rv = 0;
+ regex_t port_regex;
+ bool use_regexp = false;
+ if (port_name_pattern.size () > 0) {
+ if (!regcomp (&port_regex, port_name_pattern.c_str (), REG_EXTENDED|REG_NOSUB)) {
+ use_regexp = true;
+ }
+ }
+ for (size_t i = 0; i < _ports.size (); ++i) {
+ AlsaPort* port = _ports[i];
+ if ((port->type () == type) && (port->flags () & flags)) {
+ if (!use_regexp || !regexec (&port_regex, port->name ().c_str (), 0, NULL, 0)) {
+ port_names.push_back (port->name ());
+ ++rv;
+ }
+ }
+ }
+ if (use_regexp) {
+ regfree (&port_regex);
+ }
+ return rv;
+}
+
+DataType
+AlsaAudioBackend::port_data_type (PortEngine::PortHandle port) const
+{
+ if (!valid_port (port)) {
+ return DataType::NIL;
+ }
+ return static_cast<AlsaPort*>(port)->type ();
+}
+
+PortEngine::PortHandle
+AlsaAudioBackend::register_port (
+ const std::string& name,
+ ARDOUR::DataType type,
+ ARDOUR::PortFlags flags)
+{
+ if (name.size () == 0) { return 0; }
+ if (flags & IsPhysical) { return 0; }
+ return add_port (_instance_name + ":" + name, type, flags);
+}
+
+PortEngine::PortHandle
+AlsaAudioBackend::add_port (
+ const std::string& name,
+ ARDOUR::DataType type,
+ ARDOUR::PortFlags flags)
+{
+ assert(name.size ());
+ if (find_port (name)) {
+ PBD::error << _("AlsaBackend::register_port: Port already exists:")
+ << " (" << name << ")" << endmsg;
+ return 0;
+ }
+ AlsaPort* port = NULL;
+ switch (type) {
+ case DataType::AUDIO:
+ port = new AlsaAudioPort (*this, name, flags);
+ break;
+ case DataType::MIDI:
+ port = new AlsaMidiPort (*this, name, flags);
+ break;
+ default:
+ PBD::error << _("AlsaBackend::register_port: Invalid Data Type.") << endmsg;
+ return 0;
+ }
+
+ _ports.push_back (port);
+
+ return port;
+}
+
+void
+AlsaAudioBackend::unregister_port (PortEngine::PortHandle port_handle)
+{
+ if (!valid_port (port_handle)) {
+ PBD::error << _("AlsaBackend::unregister_port: Invalid Port.") << endmsg;
+ }
+ AlsaPort* port = static_cast<AlsaPort*>(port_handle);
+ std::vector<AlsaPort*>::iterator i = std::find (_ports.begin (), _ports.end (), static_cast<AlsaPort*>(port_handle));
+ if (i == _ports.end ()) {
+ PBD::error << _("AlsaBackend::unregister_port: Failed to find port") << endmsg;
+ return;
+ }
+ disconnect_all(port_handle);
+ _ports.erase (i);
+ delete port;
+}
+
+int
+AlsaAudioBackend::register_system_ports()
+{
+ LatencyRange lr;
+
+ const int a_ins = _n_inputs > 0 ? _n_inputs : 2;
+ const int a_out = _n_outputs > 0 ? _n_outputs : 2;
+ const int m_ins = _n_midi_inputs > 0 ? _n_midi_inputs : 2;
+ const int m_out = _n_midi_outputs > 0 ? _n_midi_outputs : 2;
+
+ /* audio ports */
+ lr.min = lr.max = _samples_per_period * _periods_per_cycle + _systemic_input_latency;
+ for (int i = 1; i <= a_ins; ++i) {
+ char tmp[64];
+ snprintf(tmp, sizeof(tmp), "system:capture_%d", i);
+ PortHandle p = add_port(std::string(tmp), DataType::AUDIO, static_cast<PortFlags>(IsOutput | IsPhysical | IsTerminal));
+ if (!p) return -1;
+ set_latency_range (p, false, lr);
+ _system_inputs.push_back(static_cast<AlsaPort*>(p));
+ }
+
+ lr.min = lr.max = _samples_per_period * _periods_per_cycle + _systemic_output_latency;
+ for (int i = 1; i <= a_out; ++i) {
+ char tmp[64];
+ snprintf(tmp, sizeof(tmp), "system:playback_%d", i);
+ PortHandle p = add_port(std::string(tmp), DataType::AUDIO, static_cast<PortFlags>(IsInput | IsPhysical | IsTerminal));
+ if (!p) return -1;
+ set_latency_range (p, false, lr);
+ _system_outputs.push_back(static_cast<AlsaPort*>(p));
+ }
+
+ /* midi ports */
+ lr.min = lr.max = _samples_per_period + _systemic_input_latency;
+ for (int i = 1; i <= m_ins; ++i) {
+ char tmp[64];
+ snprintf(tmp, sizeof(tmp), "system:midi_capture_%d", i);
+ PortHandle p = add_port(std::string(tmp), DataType::MIDI, static_cast<PortFlags>(IsOutput | IsPhysical | IsTerminal));
+ if (!p) return -1;
+ set_latency_range (p, false, lr);
+ }
+
+ lr.min = lr.max = _samples_per_period + _systemic_output_latency;
+ for (int i = 1; i <= m_out; ++i) {
+ char tmp[64];
+ snprintf(tmp, sizeof(tmp), "system:midi_playback_%d", i);
+ PortHandle p = add_port(std::string(tmp), DataType::MIDI, static_cast<PortFlags>(IsInput | IsPhysical | IsTerminal));
+ if (!p) return -1;
+ set_latency_range (p, false, lr);
+ }
+
+ return 0;
+}
+
+void
+AlsaAudioBackend::unregister_system_ports()
+{
+ size_t i = 0;
+ _system_inputs.clear();
+ _system_outputs.clear();
+ while (i < _ports.size ()) {
+ AlsaPort* port = _ports[i];
+ if (port->is_physical () && port->is_terminal ()) {
+ port->disconnect_all ();
+ _ports.erase (_ports.begin() + i);
+ } else {
+ ++i;
+ }
+ }
+}
+
+int
+AlsaAudioBackend::connect (const std::string& src, const std::string& dst)
+{
+ AlsaPort* src_port = find_port (src);
+ AlsaPort* dst_port = find_port (dst);
+
+ if (!src_port) {
+ PBD::error << _("AlsaBackend::connect: Invalid Source port:")
+ << " (" << src <<")" << endmsg;
+ return -1;
+ }
+ if (!dst_port) {
+ PBD::error << _("AlsaBackend::connect: Invalid Destination port:")
+ << " (" << dst <<")" << endmsg;
+ return -1;
+ }
+ return src_port->connect (dst_port);
+}
+
+int
+AlsaAudioBackend::disconnect (const std::string& src, const std::string& dst)
+{
+ AlsaPort* src_port = find_port (src);
+ AlsaPort* dst_port = find_port (dst);
+
+ if (!src_port || !dst_port) {
+ PBD::error << _("AlsaBackend::disconnect: Invalid Port(s)") << endmsg;
+ return -1;
+ }
+ return src_port->disconnect (dst_port);
+}
+
+int
+AlsaAudioBackend::connect (PortEngine::PortHandle src, const std::string& dst)
+{
+ AlsaPort* dst_port = find_port (dst);
+ if (!valid_port (src)) {
+ PBD::error << _("AlsaBackend::connect: Invalid Source Port Handle") << endmsg;
+ return -1;
+ }
+ if (!dst_port) {
+ PBD::error << _("AlsaBackend::connect: Invalid Destination Port")
+ << " (" << dst << ")" << endmsg;
+ return -1;
+ }
+ return static_cast<AlsaPort*>(src)->connect (dst_port);
+}
+
+int
+AlsaAudioBackend::disconnect (PortEngine::PortHandle src, const std::string& dst)
+{
+ AlsaPort* dst_port = find_port (dst);
+ if (!valid_port (src) || !dst_port) {
+ PBD::error << _("AlsaBackend::disconnect: Invalid Port(s)") << endmsg;
+ return -1;
+ }
+ return static_cast<AlsaPort*>(src)->disconnect (dst_port);
+}
+
+int
+AlsaAudioBackend::disconnect_all (PortEngine::PortHandle port)
+{
+ if (!valid_port (port)) {
+ PBD::error << _("AlsaBackend::disconnect_all: Invalid Port") << endmsg;
+ return -1;
+ }
+ static_cast<AlsaPort*>(port)->disconnect_all ();
+ return 0;
+}
+
+bool
+AlsaAudioBackend::connected (PortEngine::PortHandle port, bool /* process_callback_safe*/)
+{
+ if (!valid_port (port)) {
+ PBD::error << _("AlsaBackend::disconnect_all: Invalid Port") << endmsg;
+ return false;
+ }
+ return static_cast<AlsaPort*>(port)->is_connected ();
+}
+
+bool
+AlsaAudioBackend::connected_to (PortEngine::PortHandle src, const std::string& dst, bool /*process_callback_safe*/)
+{
+ AlsaPort* dst_port = find_port (dst);
+ if (!valid_port (src) || !dst_port) {
+ PBD::error << _("AlsaBackend::connected_to: Invalid Port") << endmsg;
+ return false;
+ }
+ return static_cast<AlsaPort*>(src)->is_connected (dst_port);
+}
+
+bool
+AlsaAudioBackend::physically_connected (PortEngine::PortHandle port, bool /*process_callback_safe*/)
+{
+ if (!valid_port (port)) {
+ PBD::error << _("AlsaBackend::physically_connected: Invalid Port") << endmsg;
+ return false;
+ }
+ return static_cast<AlsaPort*>(port)->is_physically_connected ();
+}
+
+int
+AlsaAudioBackend::get_connections (PortEngine::PortHandle port, std::vector<std::string>& names, bool /*process_callback_safe*/)
+{
+ if (!valid_port (port)) {
+ PBD::error << _("AlsaBackend::get_connections: Invalid Port") << endmsg;
+ return -1;
+ }
+
+ assert (0 == names.size ());
+
+ const std::vector<AlsaPort*>& connected_ports = static_cast<AlsaPort*>(port)->get_connections ();
+
+ for (std::vector<AlsaPort*>::const_iterator i = connected_ports.begin (); i != connected_ports.end (); ++i) {
+ names.push_back ((*i)->name ());
+ }
+
+ return (int)names.size ();
+}
+
+/* MIDI */
+int
+AlsaAudioBackend::midi_event_get (
+ pframes_t& timestamp,
+ size_t& size, uint8_t** buf, void* port_buffer,
+ uint32_t event_index)
+{
+ assert (buf && port_buffer);
+ AlsaMidiBuffer& source = * static_cast<AlsaMidiBuffer*>(port_buffer);
+ if (event_index >= source.size ()) {
+ return -1;
+ }
+ AlsaMidiEvent * const event = source[event_index].get ();
+
+ timestamp = event->timestamp ();
+ size = event->size ();
+ *buf = event->data ();
+ return 0;
+}
+
+int
+AlsaAudioBackend::midi_event_put (
+ void* port_buffer,
+ pframes_t timestamp,
+ const uint8_t* buffer, size_t size)
+{
+ assert (buffer && port_buffer);
+ AlsaMidiBuffer& dst = * static_cast<AlsaMidiBuffer*>(port_buffer);
+ if (dst.size () && (pframes_t)dst.back ()->timestamp () > timestamp) {
+ fprintf (stderr, "AlsaMidiBuffer: it's too late for this event. %d > %d\n",
+ (pframes_t)dst.back ()->timestamp (), timestamp);
+ return -1;
+ }
+ dst.push_back (boost::shared_ptr<AlsaMidiEvent>(new AlsaMidiEvent (timestamp, buffer, size)));
+ return 0;
+}
+
+uint32_t
+AlsaAudioBackend::get_midi_event_count (void* port_buffer)
+{
+ assert (port_buffer);
+ return static_cast<AlsaMidiBuffer*>(port_buffer)->size ();
+}
+
+void
+AlsaAudioBackend::midi_clear (void* port_buffer)
+{
+ assert (port_buffer);
+ AlsaMidiBuffer * buf = static_cast<AlsaMidiBuffer*>(port_buffer);
+ assert (buf);
+ buf->clear ();
+}
+
+/* Monitoring */
+
+bool
+AlsaAudioBackend::can_monitor_input () const
+{
+ return false;
+}
+
+int
+AlsaAudioBackend::request_input_monitoring (PortEngine::PortHandle, bool)
+{
+ return -1;
+}
+
+int
+AlsaAudioBackend::ensure_input_monitoring (PortEngine::PortHandle, bool)
+{
+ return -1;
+}
+
+bool
+AlsaAudioBackend::monitoring_input (PortEngine::PortHandle)
+{
+ return false;
+}
+
+/* Latency management */
+
+void
+AlsaAudioBackend::set_latency_range (PortEngine::PortHandle port, bool for_playback, LatencyRange latency_range)
+{
+ if (!valid_port (port)) {
+ PBD::error << _("AlsaPort::set_latency_range (): invalid port.") << endmsg;
+ }
+ static_cast<AlsaPort*>(port)->set_latency_range (latency_range, for_playback);
+}
+
+LatencyRange
+AlsaAudioBackend::get_latency_range (PortEngine::PortHandle port, bool for_playback)
+{
+ if (!valid_port (port)) {
+ PBD::error << _("AlsaPort::get_latency_range (): invalid port.") << endmsg;
+ LatencyRange r;
+ r.min = 0;
+ r.max = 0;
+ return r;
+ }
+ return static_cast<AlsaPort*>(port)->latency_range (for_playback);
+}
+
+/* Discovering physical ports */
+
+bool
+AlsaAudioBackend::port_is_physical (PortEngine::PortHandle port) const
+{
+ if (!valid_port (port)) {
+ PBD::error << _("AlsaPort::port_is_physical (): invalid port.") << endmsg;
+ return false;
+ }
+ return static_cast<AlsaPort*>(port)->is_physical ();
+}
+
+void
+AlsaAudioBackend::get_physical_outputs (DataType type, std::vector<std::string>& port_names)
+{
+ for (size_t i = 0; i < _ports.size (); ++i) {
+ AlsaPort* port = _ports[i];
+ if ((port->type () == type) && port->is_input () && port->is_physical ()) {
+ port_names.push_back (port->name ());
+ }
+ }
+}
+
+void
+AlsaAudioBackend::get_physical_inputs (DataType type, std::vector<std::string>& port_names)
+{
+ for (size_t i = 0; i < _ports.size (); ++i) {
+ AlsaPort* port = _ports[i];
+ if ((port->type () == type) && port->is_output () && port->is_physical ()) {
+ port_names.push_back (port->name ());
+ }
+ }
+}
+
+ChanCount
+AlsaAudioBackend::n_physical_outputs () const
+{
+ int n_midi = 0;
+ int n_audio = 0;
+ for (size_t i = 0; i < _ports.size (); ++i) {
+ AlsaPort* port = _ports[i];
+ if (port->is_output () && port->is_physical ()) {
+ switch (port->type ()) {
+ case DataType::AUDIO: ++n_audio; break;
+ case DataType::MIDI: ++n_midi; break;
+ default: break;
+ }
+ }
+ }
+ ChanCount cc;
+ cc.set (DataType::AUDIO, n_audio);
+ cc.set (DataType::MIDI, n_midi);
+ return cc;
+}
+
+ChanCount
+AlsaAudioBackend::n_physical_inputs () const
+{
+ int n_midi = 0;
+ int n_audio = 0;
+ for (size_t i = 0; i < _ports.size (); ++i) {
+ AlsaPort* port = _ports[i];
+ if (port->is_input () && port->is_physical ()) {
+ switch (port->type ()) {
+ case DataType::AUDIO: ++n_audio; break;
+ case DataType::MIDI: ++n_midi; break;
+ default: break;
+ }
+ }
+ }
+ ChanCount cc;
+ cc.set (DataType::AUDIO, n_audio);
+ cc.set (DataType::MIDI, n_midi);
+ return cc;
+}
+
+/* Getting access to the data buffer for a port */
+
+void*
+AlsaAudioBackend::get_buffer (PortEngine::PortHandle port, pframes_t nframes)
+{
+ assert (port);
+ assert (valid_port (port));
+ return static_cast<AlsaPort*>(port)->get_buffer (nframes);
+}
+
+/* Engine Process */
+void *
+AlsaAudioBackend::main_process_thread ()
+{
+ AudioEngine::thread_init_callback (this);
+ _running = true;
+ _processed_samples = 0;
+
+ uint64_t clock1, clock2;
+ clock1 = g_get_monotonic_time();
+ _pcmi->pcm_start ();
+ int no_proc_errors = 0;
+
+ while (_running) {
+ long nr;
+ bool xrun = false;
+ if (!_freewheeling) {
+ nr = _pcmi->pcm_wait ();
+
+ if (_pcmi->state () > 0) {
+ ++no_proc_errors;
+ xrun = true;
+ }
+ if (_pcmi->state () < 0 || no_proc_errors > 50) {
+ PBD::error << _("AlsaAudioBackend: I/O error. Audio Process Terminated.") << endmsg;
+ break;
+ }
+ while (nr >= (long)_samples_per_period) {
+ uint32_t i = 0;
+ clock1 = g_get_monotonic_time();
+ no_proc_errors = 0;
+
+ _pcmi->capt_init (_samples_per_period);
+ for (std::vector<AlsaPort*>::const_iterator it = _system_inputs.begin (); it != _system_inputs.end (); ++it, ++i) {
+ _pcmi->capt_chan (i, (float*)((*it)->get_buffer(_samples_per_period)), _samples_per_period);
+ }
+ _pcmi->capt_done (_samples_per_period);
+
+ for (std::vector<AlsaPort*>::const_iterator it = _system_outputs.begin (); it != _system_outputs.end (); ++it) {
+ memset ((*it)->get_buffer (_samples_per_period), 0, _samples_per_period * sizeof (Sample));
+ }
+
+ if (engine.process_callback (_samples_per_period)) {
+ _pcmi->pcm_stop ();
+ return 0;
+ }
+
+ /* write back audio */
+ i = 0;
+ _pcmi->play_init (_samples_per_period);
+ for (std::vector<AlsaPort*>::const_iterator it = _system_outputs.begin (); it != _system_outputs.end (); ++it, ++i) {
+ _pcmi->play_chan (i, (const float*)(*it)->get_buffer (_samples_per_period), _samples_per_period);
+ }
+ for (; i < _pcmi->nplay (); ++i) {
+ _pcmi->clear_chan (i, _samples_per_period);
+ }
+ _pcmi->play_done (_samples_per_period);
+ nr -= _samples_per_period;
+ _processed_samples += _samples_per_period;
+
+ /* calculate DSP load */
+ clock2 = g_get_monotonic_time();
+ const int64_t elapsed_time = clock2 - clock1;
+ const int64_t nomial_time = 1e6 * _samples_per_period / _samplerate;
+ _dsp_load = elapsed_time / (float) nomial_time;
+ }
+
+ if (xrun && (_pcmi->capt_xrun() > 0 || _pcmi->play_xrun() > 0)) {
+ engine.Xrun ();
+#if 0
+ fprintf(stderr, "ALSA x-run read: %.1f ms, write: %.1f ms\n",
+ _pcmi->capt_xrun() * 1000.0, _pcmi->play_xrun() * 1000.0);
+#endif
+ }
+ } else {
+ // Freewheelin'
+ for (std::vector<AlsaPort*>::const_iterator it = _system_inputs.begin (); it != _system_inputs.end (); ++it) {
+ memset ((*it)->get_buffer (_samples_per_period), 0, _samples_per_period * sizeof (Sample));
+ }
+ if (engine.process_callback (_samples_per_period)) {
+ _pcmi->pcm_stop ();
+ return 0;
+ }
+ _dsp_load = 1.0;
+ Glib::usleep (100); // don't hog cpu
+ }
+
+ if (!pthread_mutex_trylock (&_port_callback_mutex)) {
+ while (!_port_connection_queue.empty ()) {
+ PortConnectData *c = _port_connection_queue.back ();
+ manager.connect_callback (c->a, c->b, c->c);
+ _port_connection_queue.pop_back ();
+ delete c;
+ }
+ pthread_mutex_unlock (&_port_callback_mutex);
+ }
+
+ }
+ _pcmi->pcm_stop ();
+ return 0;
+}
+
+
+/******************************************************************************/
+
+static boost::shared_ptr<AlsaAudioBackend> _instance;
+
+static boost::shared_ptr<AudioBackend> backend_factory (AudioEngine& e);
+static int instantiate (const std::string& arg1, const std::string& /* arg2 */);
+static int deinstantiate ();
+static bool already_configured ();
+
+static ARDOUR::AudioBackendInfo _descriptor = {
+ "Alsa",
+ instantiate,
+ deinstantiate,
+ backend_factory,
+ already_configured,
+};
+
+static boost::shared_ptr<AudioBackend>
+backend_factory (AudioEngine& e)
+{
+ if (!_instance) {
+ _instance.reset (new AlsaAudioBackend (e, _descriptor));
+ }
+ return _instance;
+}
+
+static int
+instantiate (const std::string& arg1, const std::string& /* arg2 */)
+{
+ s_instance_name = arg1;
+ return 0;
+}
+
+static int
+deinstantiate ()
+{
+ _instance.reset ();
+ return 0;
+}
+
+static bool
+already_configured ()
+{
+ return false;
+}
+
+extern "C" ARDOURBACKEND_API ARDOUR::AudioBackendInfo* descriptor ()
+{
+ return &_descriptor;
+}
+
+
+/******************************************************************************/
+AlsaPort::AlsaPort (AlsaAudioBackend &b, const std::string& name, PortFlags flags)
+ : _alsa_backend (b)
+ , _name (name)
+ , _flags (flags)
+{
+ _capture_latency_range.min = 0;
+ _capture_latency_range.max = 0;
+ _playback_latency_range.min = 0;
+ _playback_latency_range.max = 0;
+}
+
+AlsaPort::~AlsaPort () {
+ disconnect_all ();
+}
+
+
+int AlsaPort::connect (AlsaPort *port)
+{
+ if (!port) {
+ PBD::error << _("AlsaPort::connect (): invalid (null) port") << endmsg;
+ return -1;
+ }
+
+ if (type () != port->type ()) {
+ PBD::error << _("AlsaPort::connect (): wrong port-type") << endmsg;
+ return -1;
+ }
+
+ if (is_output () && port->is_output ()) {
+ PBD::error << _("AlsaPort::connect (): cannot inter-connect output ports.") << endmsg;
+ return -1;
+ }
+
+ if (is_input () && port->is_input ()) {
+ PBD::error << _("AlsaPort::connect (): cannot inter-connect input ports.") << endmsg;
+ return -1;
+ }
+
+ if (this == port) {
+ PBD::error << _("AlsaPort::connect (): cannot self-connect ports.") << endmsg;
+ return -1;
+ }
+
+ if (is_connected (port)) {
+#if 0 // don't bother to warn about this for now. just ignore it
+ PBD::error << _("AlsaPort::connect (): ports are already connected:")
+ << " (" << name () << ") -> (" << port->name () << ")"
+ << endmsg;
+#endif
+ return -1;
+ }
+
+ _connect (port, true);
+ return 0;
+}
+
+
+void AlsaPort::_connect (AlsaPort *port, bool callback)
+{
+ _connections.push_back (port);
+ if (callback) {
+ port->_connect (this, false);
+ _alsa_backend.port_connect_callback (name(), port->name(), true);
+ }
+}
+
+int AlsaPort::disconnect (AlsaPort *port)
+{
+ if (!port) {
+ PBD::error << _("AlsaPort::disconnect (): invalid (null) port") << endmsg;
+ return -1;
+ }
+
+ if (!is_connected (port)) {
+ PBD::error << _("AlsaPort::disconnect (): ports are not connected:")
+ << " (" << name () << ") -> (" << port->name () << ")"
+ << endmsg;
+ return -1;
+ }
+ _disconnect (port, true);
+ return 0;
+}
+
+void AlsaPort::_disconnect (AlsaPort *port, bool callback)
+{
+ std::vector<AlsaPort*>::iterator it = std::find (_connections.begin (), _connections.end (), port);
+
+ assert (it != _connections.end ());
+
+ _connections.erase (it);
+
+ if (callback) {
+ port->_disconnect (this, false);
+ _alsa_backend.port_connect_callback (name(), port->name(), false);
+ }
+}
+
+
+void AlsaPort::disconnect_all ()
+{
+ while (!_connections.empty ()) {
+ _connections.back ()->_disconnect (this, false);
+ _alsa_backend.port_connect_callback (name(), _connections.back ()->name(), false);
+ _connections.pop_back ();
+ }
+}
+
+bool
+AlsaPort::is_connected (const AlsaPort *port) const
+{
+ return std::find (_connections.begin (), _connections.end (), port) != _connections.end ();
+}
+
+bool AlsaPort::is_physically_connected () const
+{
+ for (std::vector<AlsaPort*>::const_iterator it = _connections.begin (); it != _connections.end (); ++it) {
+ if ((*it)->is_physical ()) {
+ return true;
+ }
+ }
+ return false;
+}
+
+/******************************************************************************/
+
+AlsaAudioPort::AlsaAudioPort (AlsaAudioBackend &b, const std::string& name, PortFlags flags)
+ : AlsaPort (b, name, flags)
+{
+ memset (_buffer, 0, sizeof (_buffer));
+ mlock(_buffer, sizeof (_buffer));
+}
+
+AlsaAudioPort::~AlsaAudioPort () { }
+
+void* AlsaAudioPort::get_buffer (pframes_t n_samples)
+{
+ if (is_input ()) {
+ std::vector<AlsaPort*>::const_iterator it = get_connections ().begin ();
+ if (it == get_connections ().end ()) {
+ memset (_buffer, 0, n_samples * sizeof (Sample));
+ } else {
+ AlsaAudioPort const * source = static_cast<const AlsaAudioPort*>(*it);
+ assert (source && source->is_output ());
+ memcpy (_buffer, source->const_buffer (), n_samples * sizeof (Sample));
+ while (++it != get_connections ().end ()) {
+ source = static_cast<const AlsaAudioPort*>(*it);
+ assert (source && source->is_output ());
+ Sample* dst = buffer ();
+ const Sample* src = source->const_buffer ();
+ for (uint32_t s = 0; s < n_samples; ++s, ++dst, ++src) {
+ *dst += *src;
+ }
+ }
+ }
+ }
+ return _buffer;
+}
+
+
+AlsaMidiPort::AlsaMidiPort (AlsaAudioBackend &b, const std::string& name, PortFlags flags)
+ : AlsaPort (b, name, flags)
+{
+ _buffer.clear ();
+}
+
+AlsaMidiPort::~AlsaMidiPort () { }
+
+struct MidiEventSorter {
+ bool operator() (const boost::shared_ptr<AlsaMidiEvent>& a, const boost::shared_ptr<AlsaMidiEvent>& b) {
+ return *a < *b;
+ }
+};
+
+void* AlsaMidiPort::get_buffer (pframes_t /* nframes */)
+{
+ if (is_input ()) {
+ _buffer.clear ();
+ for (std::vector<AlsaPort*>::const_iterator i = get_connections ().begin ();
+ i != get_connections ().end ();
+ ++i) {
+ const AlsaMidiBuffer src = static_cast<const AlsaMidiPort*>(*i)->const_buffer ();
+ for (AlsaMidiBuffer::const_iterator it = src.begin (); it != src.end (); ++it) {
+ _buffer.push_back (boost::shared_ptr<AlsaMidiEvent>(new AlsaMidiEvent (**it)));
+ }
+ }
+ std::sort (_buffer.begin (), _buffer.end (), MidiEventSorter());
+ }
+ return &_buffer;
+}
+
+AlsaMidiEvent::AlsaMidiEvent (const pframes_t timestamp, const uint8_t* data, size_t size)
+ : _size (size)
+ , _timestamp (timestamp)
+ , _data (0)
+{
+ if (size > 0) {
+ _data = (uint8_t*) malloc (size);
+ memcpy (_data, data, size);
+ }
+}
+
+AlsaMidiEvent::AlsaMidiEvent (const AlsaMidiEvent& other)
+ : _size (other.size ())
+ , _timestamp (other.timestamp ())
+ , _data (0)
+{
+ if (other.size () && other.const_data ()) {
+ _data = (uint8_t*) malloc (other.size ());
+ memcpy (_data, other.const_data (), other.size ());
+ }
+};
+
+AlsaMidiEvent::~AlsaMidiEvent () {
+ free (_data);
+};
--- /dev/null
+/*
+ * Copyright (C) 2014 Robin Gareus <robin@gareus.org>
+ * Copyright (C) 2013 Paul Davis
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#ifndef __libbackend_alsa_audiobackend_h__
+#define __libbackend_alsa_audiobackend_h__
+
+#include <string>
+#include <vector>
+#include <map>
+#include <set>
+
+#include <stdint.h>
+#include <pthread.h>
+
+#include <boost/shared_ptr.hpp>
+
+#include "ardour/types.h"
+#include "ardour/audio_backend.h"
+
+#include "zita-alsa-pcmi.h"
+
+namespace ARDOUR {
+
+class AlsaAudioBackend;
+
+class AlsaMidiEvent {
+ public:
+ AlsaMidiEvent (const pframes_t timestamp, const uint8_t* data, size_t size);
+ AlsaMidiEvent (const AlsaMidiEvent& other);
+ ~AlsaMidiEvent ();
+ size_t size () const { return _size; };
+ pframes_t timestamp () const { return _timestamp; };
+ const unsigned char* const_data () const { return _data; };
+ unsigned char* data () { return _data; };
+ bool operator< (const AlsaMidiEvent &other) const { return timestamp () < other.timestamp (); };
+ private:
+ size_t _size;
+ pframes_t _timestamp;
+ uint8_t *_data;
+};
+
+typedef std::vector<boost::shared_ptr<AlsaMidiEvent> > AlsaMidiBuffer;
+
+class AlsaPort {
+ protected:
+ AlsaPort (AlsaAudioBackend &b, const std::string&, PortFlags);
+ public:
+ virtual ~AlsaPort ();
+
+ const std::string& name () const { return _name; }
+ PortFlags flags () const { return _flags; }
+
+ int set_name (const std::string &name) { _name = name; return 0; }
+
+ virtual DataType type () const = 0;
+
+ bool is_input () const { return flags () & IsInput; }
+ bool is_output () const { return flags () & IsOutput; }
+ bool is_physical () const { return flags () & IsPhysical; }
+ bool is_terminal () const { return flags () & IsTerminal; }
+ bool is_connected () const { return _connections.size () != 0; }
+ bool is_connected (const AlsaPort *port) const;
+ bool is_physically_connected () const;
+
+ const std::vector<AlsaPort *>& get_connections () const { return _connections; }
+
+ int connect (AlsaPort *port);
+ int disconnect (AlsaPort *port);
+ void disconnect_all ();
+
+ virtual void* get_buffer (pframes_t nframes) = 0;
+
+ const LatencyRange& latency_range (bool for_playback) const
+ {
+ return for_playback ? _playback_latency_range : _capture_latency_range;
+ }
+
+ void set_latency_range (const LatencyRange &latency_range, bool for_playback)
+ {
+ if (for_playback)
+ {
+ _playback_latency_range = latency_range;
+ }
+ else
+ {
+ _capture_latency_range = latency_range;
+ }
+ }
+
+ private:
+ AlsaAudioBackend &_alsa_backend;
+ std::string _name;
+ const PortFlags _flags;
+ LatencyRange _capture_latency_range;
+ LatencyRange _playback_latency_range;
+ std::vector<AlsaPort*> _connections;
+
+ void _connect (AlsaPort* , bool);
+ void _disconnect (AlsaPort* , bool);
+
+}; // class AlsaPort
+
+class AlsaAudioPort : public AlsaPort {
+ public:
+ AlsaAudioPort (AlsaAudioBackend &b, const std::string&, PortFlags);
+ ~AlsaAudioPort ();
+
+ DataType type () const { return DataType::AUDIO; };
+
+ Sample* buffer () { return _buffer; }
+ const Sample* const_buffer () const { return _buffer; }
+ void* get_buffer (pframes_t nframes);
+
+ private:
+ Sample _buffer[8192];
+}; // class AlsaAudioPort
+
+class AlsaMidiPort : public AlsaPort {
+ public:
+ AlsaMidiPort (AlsaAudioBackend &b, const std::string&, PortFlags);
+ ~AlsaMidiPort ();
+
+ DataType type () const { return DataType::MIDI; };
+
+ void* get_buffer (pframes_t nframes);
+ const AlsaMidiBuffer const_buffer () const { return _buffer; }
+
+ private:
+ AlsaMidiBuffer _buffer;
+}; // class AlsaMidiPort
+
+class AlsaAudioBackend : public AudioBackend {
+ friend class AlsaPort;
+ public:
+ AlsaAudioBackend (AudioEngine& e, AudioBackendInfo& info);
+ ~AlsaAudioBackend ();
+
+ /* AUDIOBACKEND API */
+
+ std::string name () const;
+ bool is_realtime () const;
+
+ 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;
+ uint32_t available_input_channel_count (const std::string& device) const;
+ uint32_t available_output_channel_count (const std::string& device) const;
+
+ bool can_change_sample_rate_when_running () const;
+ bool can_change_buffer_size_when_running () const;
+
+ int set_device_name (const std::string&);
+ int set_sample_rate (float);
+ int set_buffer_size (uint32_t);
+ int set_interleaved (bool yn);
+ int set_input_channels (uint32_t);
+ int set_output_channels (uint32_t);
+ int set_systemic_input_latency (uint32_t);
+ int set_systemic_output_latency (uint32_t);
+
+ /* Retrieving parameters */
+ std::string device_name () const;
+ float sample_rate () const;
+ uint32_t buffer_size () const;
+ bool interleaved () const;
+ uint32_t input_channels () const;
+ uint32_t output_channels () const;
+ uint32_t systemic_input_latency () const;
+ uint32_t systemic_output_latency () const;
+
+ /* External control app */
+ std::string control_app_name () const { return std::string (); }
+ void launch_control_app () {}
+
+ /* MIDI */
+ std::vector<std::string> enumerate_midi_options () const;
+ int set_midi_option (const std::string&);
+ std::string midi_option () const;
+
+ /* State Control */
+ protected:
+ int _start (bool for_latency_measurement);
+ public:
+ int stop ();
+ int freewheel (bool);
+ float dsp_load () const;
+ size_t raw_buffer_size (DataType t);
+
+ /* Process time */
+ pframes_t sample_time ();
+ pframes_t sample_time_at_cycle_start ();
+ pframes_t samples_since_cycle_start ();
+
+ int create_process_thread (boost::function<void()> func);
+ int join_process_threads ();
+ bool in_process_thread ();
+ uint32_t process_thread_count ();
+
+ void update_latencies ();
+
+ /* PORTENGINE API */
+
+ void* private_handle () const;
+ const std::string& my_name () const;
+ bool available () const;
+ uint32_t port_name_size () const;
+
+ int set_port_name (PortHandle, const std::string&);
+ std::string get_port_name (PortHandle) const;
+ PortHandle get_port_by_name (const std::string&) const;
+
+ int get_ports (const std::string& port_name_pattern, DataType type, PortFlags flags, std::vector<std::string>&) const;
+
+ DataType port_data_type (PortHandle) const;
+
+ PortHandle register_port (const std::string& shortname, ARDOUR::DataType, ARDOUR::PortFlags);
+ void unregister_port (PortHandle);
+
+ int connect (const std::string& src, const std::string& dst);
+ int disconnect (const std::string& src, const std::string& dst);
+ int connect (PortHandle, const std::string&);
+ int disconnect (PortHandle, const std::string&);
+ int disconnect_all (PortHandle);
+
+ bool connected (PortHandle, bool process_callback_safe);
+ bool connected_to (PortHandle, const std::string&, bool process_callback_safe);
+ bool physically_connected (PortHandle, bool process_callback_safe);
+ int get_connections (PortHandle, std::vector<std::string>&, bool process_callback_safe);
+
+ /* MIDI */
+ int midi_event_get (pframes_t& timestamp, size_t& size, uint8_t** buf, void* port_buffer, uint32_t event_index);
+ int midi_event_put (void* port_buffer, pframes_t timestamp, const uint8_t* buffer, size_t size);
+ uint32_t get_midi_event_count (void* port_buffer);
+ void midi_clear (void* port_buffer);
+
+ /* Monitoring */
+
+ bool can_monitor_input () const;
+ int request_input_monitoring (PortHandle, bool);
+ int ensure_input_monitoring (PortHandle, bool);
+ bool monitoring_input (PortHandle);
+
+ /* Latency management */
+
+ void set_latency_range (PortHandle, bool for_playback, LatencyRange);
+ LatencyRange get_latency_range (PortHandle, bool for_playback);
+
+ /* Discovering physical ports */
+
+ bool port_is_physical (PortHandle) const;
+ void get_physical_outputs (DataType type, std::vector<std::string>&);
+ void get_physical_inputs (DataType type, std::vector<std::string>&);
+ ChanCount n_physical_outputs () const;
+ ChanCount n_physical_inputs () const;
+
+ /* Getting access to the data buffer for a port */
+
+ void* get_buffer (PortHandle, pframes_t);
+
+ void* main_process_thread ();
+
+ private:
+ std::string _instance_name;
+ Alsa_pcmi *_pcmi;
+
+ bool _running;
+ bool _freewheeling;
+
+ std::string _capture_device;
+ std::string _playback_device;
+
+ float _samplerate;
+ size_t _samples_per_period;
+ size_t _periods_per_cycle;
+ float _dsp_load;
+ static size_t _max_buffer_size;
+
+ uint32_t _n_inputs;
+ uint32_t _n_outputs;
+
+ uint32_t _n_midi_inputs;
+ uint32_t _n_midi_outputs;
+
+ uint32_t _systemic_input_latency;
+ uint32_t _systemic_output_latency;
+
+ uint64_t _processed_samples;
+
+ pthread_t _main_thread;
+
+ /* process threads */
+ static void* alsa_process_thread (void *);
+ std::vector<pthread_t> _threads;
+
+ struct ThreadData {
+ AlsaAudioBackend* engine;
+ boost::function<void ()> f;
+ size_t stacksize;
+
+ ThreadData (AlsaAudioBackend* e, boost::function<void ()> fp, size_t stacksz)
+ : engine (e) , f (fp) , stacksize (stacksz) {}
+ };
+
+ /* port engine */
+ PortHandle add_port (const std::string& shortname, ARDOUR::DataType, ARDOUR::PortFlags);
+ int register_system_ports ();
+ void unregister_system_ports ();
+
+ std::vector<AlsaPort *> _ports;
+ std::vector<AlsaPort*> _system_inputs;
+ std::vector<AlsaPort*> _system_outputs;
+
+
+ struct PortConnectData {
+ std::string a;
+ std::string b;
+ bool c;
+
+ PortConnectData (const std::string& a, const std::string& b, bool c)
+ : a (a) , b (b) , c (c) {}
+ };
+
+ std::vector<PortConnectData *> _port_connection_queue;
+ pthread_mutex_t _port_callback_mutex;
+
+ void port_connect_callback (const std::string& a, const std::string& b, bool conn) {
+ pthread_mutex_lock (&_port_callback_mutex);
+ _port_connection_queue.push_back(new PortConnectData(a, b, conn));
+ pthread_mutex_unlock (&_port_callback_mutex);
+ }
+
+ bool valid_port (PortHandle port) const {
+ return std::find (_ports.begin (), _ports.end (), (AlsaPort*)port) != _ports.end ();
+ }
+
+ AlsaPort * find_port (const std::string& port_name) const {
+ for (std::vector<AlsaPort*>::const_iterator it = _ports.begin (); it != _ports.end (); ++it) {
+ if ((*it)->name () == port_name) {
+ return *it;
+ }
+ }
+ return NULL;
+ }
+
+}; // class AlsaAudioBackend
+
+} // namespace
+
+#endif /* __libbackend_alsa_audiobackend_h__ */
--- /dev/null
+/*
+ * Copyright (C) 2014 Robin Gareus <robin@gareus.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#ifndef __libbackend_alsa_rthread_h__
+#define __libbackend_alsa_rthread_h__
+
+#include <pthread.h>
+#include <sched.h>
+
+static int
+_realtime_pthread_create (
+ int policy, int priority,
+ pthread_t *thread,
+ void *(*start_routine) (void *),
+ void *arg)
+{
+ int rv;
+
+ pthread_attr_t attr;
+ struct sched_param parm;
+ const size_t stacksize = 100000;
+
+ const int p_min = sched_get_priority_min (policy);
+ const int p_max = sched_get_priority_max (policy);
+ priority += p_max;
+ if (priority > p_max) priority = p_max;
+ if (priority < p_min) priority = p_min;
+ parm.sched_priority = priority;
+
+ pthread_attr_init (&attr);
+ pthread_attr_setschedpolicy (&attr, policy);
+ pthread_attr_setschedparam (&attr, &parm);
+ pthread_attr_setscope (&attr, PTHREAD_SCOPE_SYSTEM);
+ pthread_attr_setinheritsched (&attr, PTHREAD_EXPLICIT_SCHED);
+ pthread_attr_setstacksize (&attr, stacksize);
+ rv = pthread_create (thread, &attr, start_routine, arg);
+ pthread_attr_destroy (&attr);
+ return rv;
+}
+
+#endif
--- /dev/null
+#!/usr/bin/env python
+from waflib.extras import autowaf as autowaf
+import os
+import sys
+import re
+
+# Library version (UNIX style major, minor, micro)
+# major increment <=> incompatible changes
+# minor increment <=> compatible changes (additions)
+# micro increment <=> no interface changes
+ALSABACKEND_VERSION = '0.0.1'
+I18N_PACKAGE = 'alsa-backend'
+
+# Mandatory variables
+top = '.'
+out = 'build'
+
+def options(opt):
+ autowaf.set_options(opt)
+
+def configure(conf):
+ autowaf.configure(conf)
+
+def build(bld):
+ obj = bld(features = 'cxx cxxshlib')
+ obj.source = [
+ 'alsa_audiobackend.cc',
+ 'zita-alsa-pcmi.cc',
+ ]
+ obj.includes = ['.']
+ obj.name = 'alsa_audiobackend'
+ obj.target = 'alsa_audiobackend'
+ obj.use = 'libardour libpbd'
+ obj.uselib = 'ALSA'
+ obj.vnum = ALSABACKEND_VERSION
+ obj.install_path = os.path.join(bld.env['LIBDIR'], 'backends')
+ obj.defines = ['PACKAGE="' + I18N_PACKAGE + '"',
+ 'ARDOURBACKEND_DLL_EXPORTS'
+ ]
--- /dev/null
+// ----------------------------------------------------------------------------
+//
+// Copyright (C) 2006-2012 Fons Adriaensen <fons@linuxaudio.org>
+//
+// This program is free software; you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation; either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program 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 for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program. If not, see <http://www.gnu.org/licenses/>.
+//
+// ----------------------------------------------------------------------------
+
+
+#include <endian.h>
+#include <sys/time.h>
+#include "zita-alsa-pcmi.h"
+
+
+// Public members ----------------------------------------------------------------------
+
+
+int zita_alsa_pcmi_major_version (void)
+{
+ return ZITA_ALSA_PCMI_MAJOR_VERSION;
+}
+
+
+int zita_alsa_pcmi_minor_version (void)
+{
+ return ZITA_ALSA_PCMI_MINOR_VERSION;
+}
+
+
+Alsa_pcmi::Alsa_pcmi (
+ const char *play_name,
+ const char *capt_name,
+ const char *ctrl_name,
+ unsigned int fsamp,
+ unsigned int fsize,
+ unsigned int nfrag,
+ unsigned int debug)
+ : _fsamp (fsamp)
+ , _fsize (fsize)
+ , _nfrag (nfrag)
+ , _debug (debug)
+ , _state (-1)
+ , _play_handle (0)
+ , _capt_handle (0)
+ , _ctrl_handle (0)
+ , _play_hwpar (0)
+ , _play_swpar (0)
+ , _capt_hwpar (0)
+ , _capt_swpar (0)
+ , _play_nchan (0)
+ , _capt_nchan (0)
+ , _play_xrun (0)
+ , _capt_xrun (0)
+ , _synced (false)
+ , _play_npfd (0)
+ , _capt_npfd (0)
+{
+ const char *p;
+
+ p = getenv ("ZITA_ALSA_PCMI_DEBUG");
+ if (p && *p) _debug = atoi (p);
+ initialise (play_name, capt_name, ctrl_name);
+}
+
+
+Alsa_pcmi::~Alsa_pcmi (void)
+{
+ if (_play_handle) snd_pcm_close (_play_handle);
+ if (_capt_handle) snd_pcm_close (_capt_handle);
+ if (_ctrl_handle) snd_ctl_close (_ctrl_handle);
+
+ snd_pcm_sw_params_free (_capt_swpar);
+ snd_pcm_hw_params_free (_capt_hwpar);
+ snd_pcm_sw_params_free (_play_swpar);
+ snd_pcm_hw_params_free (_play_hwpar);
+}
+
+
+int Alsa_pcmi::pcm_start (void)
+{
+ unsigned int i, j, n;
+ int err;
+
+ if (_play_handle)
+ {
+ n = snd_pcm_avail_update (_play_handle);
+ if (n != _fsize * _nfrag)
+ {
+ if (_debug & DEBUG_STAT) fprintf (stderr, "Alsa_pcmi: full buffer not available at start.\n");
+ return -1;
+ }
+ for (i = 0; i < _nfrag; i++)
+ {
+ play_init (_fsize);
+ for (j = 0; j < _play_nchan; j++) clear_chan (j, _fsize);
+ play_done (_fsize);
+ }
+ if ((err = snd_pcm_start (_play_handle)) < 0)
+ {
+ if (_debug & DEBUG_STAT) fprintf (stderr, "Alsa_pcmi: pcm_start(play): %s.\n", snd_strerror (err));
+ return -1;
+ }
+ }
+ if (_capt_handle && !_synced && ((err = snd_pcm_start (_capt_handle)) < 0))
+ {
+ if (_debug & DEBUG_STAT) fprintf (stderr, "Alsa_pcmi: pcm_start(capt): %s.\n", snd_strerror (err));
+ return -1;
+ }
+
+ return 0;
+}
+
+
+int Alsa_pcmi::pcm_stop (void)
+{
+ int err;
+
+ if (_play_handle && ((err = snd_pcm_drop (_play_handle)) < 0))
+ {
+ if (_debug & DEBUG_STAT) fprintf (stderr, "Alsa_pcmi: pcm_drop(play): %s.\n", snd_strerror (err));
+ return -1;
+ }
+ if (_capt_handle && !_synced && ((err = snd_pcm_drop (_capt_handle)) < 0))
+ {
+ if (_debug & DEBUG_STAT) fprintf (stderr, "Alsa_pcmi: pcm_drop(capt): %s.\n", snd_strerror (err));
+ return -1;
+ }
+
+ return 0;
+}
+
+
+snd_pcm_sframes_t Alsa_pcmi::pcm_wait (void)
+{
+ bool need_capt;
+ bool need_play;
+ snd_pcm_sframes_t capt_av;
+ snd_pcm_sframes_t play_av;
+ unsigned short rev;
+ int i, r, n1, n2;
+
+ _state = 0;
+ need_capt = _capt_handle ? true : false;
+ need_play = _play_handle ? true : false;
+
+ while (need_play || need_capt)
+ {
+ n1 = 0;
+ if (need_play)
+ {
+ snd_pcm_poll_descriptors (_play_handle, _poll_fd, _play_npfd);
+ n1 += _play_npfd;
+ }
+ n2 = n1;
+ if (need_capt)
+ {
+ snd_pcm_poll_descriptors (_capt_handle, _poll_fd + n1, _capt_npfd);
+ n2 += _capt_npfd;
+ }
+ for (i = 0; i < n2; i++) _poll_fd [i].events |= POLLERR;
+
+ r = poll (_poll_fd, n2, 1000);
+ if (r < 0)
+ {
+ if (errno == EINTR) return 0;
+ if (_debug & DEBUG_WAIT) fprintf (stderr, "Alsa_pcmi: poll(): %s\n.", strerror (errno));
+ _state = -1;
+ return 0;
+ }
+ if (r == 0)
+ {
+ if (_debug & DEBUG_WAIT) fprintf (stderr, "Alsa_pcmi: poll timed out.\n");
+ _state = -1;
+ return 0;
+ }
+
+ if (need_play)
+ {
+ snd_pcm_poll_descriptors_revents (_play_handle, _poll_fd, n1, &rev);
+ if (rev & POLLERR)
+ {
+ if (_debug & DEBUG_WAIT) fprintf (stderr, "Alsa_pcmi: error on playback pollfd.\n");
+ _state = 1;
+ recover ();
+ return 0;
+ }
+ if (rev & POLLOUT) need_play = false;
+ }
+ if (need_capt)
+ {
+ snd_pcm_poll_descriptors_revents (_capt_handle, _poll_fd + n1, n2 - n1, &rev);
+ if (rev & POLLERR)
+ {
+ if (_debug & DEBUG_WAIT) fprintf (stderr, "Alsa_pcmi: error on capture pollfd.\n");
+ _state = 1;
+ recover ();
+ return 0;
+ }
+ if (rev & POLLIN) need_capt = false;
+ }
+ }
+
+ play_av = 999999999;
+ if (_play_handle && (play_av = snd_pcm_avail_update (_play_handle)) < 0)
+ {
+ _state = -1;
+ recover ();
+ return 0;
+ }
+ capt_av = 999999999;
+ if (_capt_handle && (capt_av = snd_pcm_avail_update (_capt_handle)) < 0)
+ {
+ _state = -1;
+ recover ();
+ return 0;
+ }
+
+ return (capt_av < play_av) ? capt_av : play_av;
+}
+
+
+int Alsa_pcmi::pcm_idle (int len)
+{
+ unsigned int i;
+ snd_pcm_uframes_t n, k;
+
+ if (_capt_handle)
+ {
+ n = len;
+ while (n)
+ {
+ k = capt_init (n);
+ capt_done (k);
+ n -= k;
+ }
+ }
+ if (_play_handle)
+ {
+ n = len;
+ while (n)
+ {
+ k = play_init (n);
+ for (i = 0; i < _play_nchan; i++) clear_chan (i, k);
+ play_done (k);
+ n -= k;
+ }
+ }
+ return 0;
+}
+
+
+int Alsa_pcmi::play_init (snd_pcm_uframes_t len)
+{
+ unsigned int i;
+ const snd_pcm_channel_area_t *a;
+ int err;
+
+ if ((err = snd_pcm_mmap_begin (_play_handle, &a, &_play_offs, &len)) < 0)
+ {
+ if (_debug & DEBUG_DATA) fprintf (stderr, "Alsa_pcmi: snd_pcm_mmap_begin(play): %s.\n", snd_strerror (err));
+ return -1;
+ }
+ _play_step = (a->step) >> 3;
+ for (i = 0; i < _play_nchan; i++, a++)
+ {
+ _play_ptr [i] = (char *) a->addr + ((a->first + a->step * _play_offs) >> 3);
+ }
+
+ return len;
+}
+
+
+int Alsa_pcmi::capt_init (snd_pcm_uframes_t len)
+{
+ unsigned int i;
+ const snd_pcm_channel_area_t *a;
+ int err;
+
+ if ((err = snd_pcm_mmap_begin (_capt_handle, &a, &_capt_offs, &len)) < 0)
+ {
+ if (_debug & DEBUG_DATA) fprintf (stderr, "Alsa_pcmi: snd_pcm_mmap_begin(capt): %s.\n", snd_strerror (err));
+ return -1;
+ }
+ _capt_step = (a->step) >> 3;
+ for (i = 0; i < _capt_nchan; i++, a++)
+ {
+ _capt_ptr [i] = (char *) a->addr + ((a->first + a->step * _capt_offs) >> 3);
+ }
+
+ return len;
+}
+
+
+void Alsa_pcmi::clear_chan (int chan, int len)
+{
+ _play_ptr [chan] = (this->*Alsa_pcmi::_clear_func)(_play_ptr [chan], len);
+}
+
+
+void Alsa_pcmi::play_chan (int chan, const float *src, int len, int step)
+{
+ _play_ptr [chan] = (this->*Alsa_pcmi::_play_func)(src, _play_ptr [chan], len, step);
+}
+
+
+void Alsa_pcmi::capt_chan (int chan, float *dst, int len, int step)
+{
+ _capt_ptr [chan] = (this->*Alsa_pcmi::_capt_func)(_capt_ptr [chan], dst, len, step);
+}
+
+
+int Alsa_pcmi::play_done (int len)
+{
+ return snd_pcm_mmap_commit (_play_handle, _play_offs, len);
+}
+
+
+int Alsa_pcmi::capt_done (int len)
+{
+ return snd_pcm_mmap_commit (_capt_handle, _capt_offs, len);
+}
+
+
+void Alsa_pcmi::printinfo (void)
+{
+ fprintf (stdout, "playback :");
+ if (_play_handle)
+ {
+ fprintf (stdout, "\n nchan : %d\n", _play_nchan);
+ fprintf (stdout, " fsamp : %d\n", _fsamp);
+ fprintf (stdout, " fsize : %ld\n", _fsize);
+ fprintf (stdout, " nfrag : %d\n", _nfrag);
+ fprintf (stdout, " format : %s\n", snd_pcm_format_name (_play_format));
+ }
+ else fprintf (stdout, " not enabled\n");
+ fprintf (stdout, "capture :");
+ if (_capt_handle)
+ {
+ fprintf (stdout, "\n nchan : %d\n", _capt_nchan);
+ fprintf (stdout, " fsamp : %d\n", _fsamp);
+ fprintf (stdout, " fsize : %ld\n", _fsize);
+ fprintf (stdout, " nfrag : %d\n", _nfrag);
+ fprintf (stdout, " format : %s\n", snd_pcm_format_name (_capt_format));
+ if (_play_handle) fprintf (stdout, "%s\n", _synced ? "synced" : "not synced");
+ }
+ else fprintf (stdout, " not enabled\n");
+}
+
+
+// Private members ---------------------------------------------------------------------
+
+
+void Alsa_pcmi::initialise (const char *play_name, const char *capt_name, const char *ctrl_name)
+{
+ unsigned int fsamp;
+ snd_pcm_uframes_t fsize;
+ unsigned int nfrag;
+ int err;
+ int dir;
+ snd_ctl_card_info_t *card;
+
+ if (play_name)
+ {
+ if (snd_pcm_open (&_play_handle, play_name, SND_PCM_STREAM_PLAYBACK, 0) < 0)
+ {
+ _play_handle = 0;
+ if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: Cannot open PCM device %s for playback.\n",
+ play_name);
+ }
+ }
+
+ if (capt_name)
+ {
+ if (snd_pcm_open (&_capt_handle, capt_name, SND_PCM_STREAM_CAPTURE, 0) < 0)
+ {
+ _capt_handle = 0;
+ if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: Cannot open PCM device %s for capture.\n",
+ capt_name);
+ }
+ }
+
+ if (! _play_handle && ! _capt_handle) return;
+
+ if (ctrl_name)
+ {
+ snd_ctl_card_info_alloca (&card);
+
+ if ((err = snd_ctl_open (&_ctrl_handle, ctrl_name, 0)) < 0)
+ {
+ if (_debug & DEBUG_INIT) fprintf (stderr, "Alse_driver: ctl_open(): %s\n",
+ snd_strerror (err));
+ return;
+ }
+ if ((err = snd_ctl_card_info (_ctrl_handle, card)) < 0)
+ {
+ if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: ctl_card_info(): %s\n",
+ snd_strerror (err));
+ return;
+ }
+ }
+
+ if (_play_handle)
+ {
+ if (snd_pcm_hw_params_malloc (&_play_hwpar) < 0)
+ {
+ if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't allocate playback hw params\n");
+ return;
+ }
+ if (snd_pcm_sw_params_malloc (&_play_swpar) < 0)
+ {
+ if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't allocate playback sw params\n");
+ return;
+ }
+ if (set_hwpar (_play_handle, _play_hwpar, "playback", &_play_nchan) < 0) return;
+ if (set_swpar (_play_handle, _play_swpar, "playback") < 0) return;
+ }
+
+ if (_capt_handle)
+ {
+ if (snd_pcm_hw_params_malloc (&_capt_hwpar) < 0)
+ {
+ if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't allocate capture hw params\n");
+ return;
+ }
+ if (snd_pcm_sw_params_malloc (&_capt_swpar) < 0)
+ {
+ if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't allocate capture sw params\n");
+ return;
+ }
+ if (set_hwpar (_capt_handle, _capt_hwpar, "capture", &_capt_nchan) < 0) return;
+ if (set_swpar (_capt_handle, _capt_swpar, "capture") < 0) return;
+ }
+
+ if (_play_handle)
+ {
+ if (snd_pcm_hw_params_get_rate (_play_hwpar, &fsamp, &dir) || (fsamp != _fsamp) || dir)
+ {
+ if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't get requested sample rate for playback.\n");
+ return;
+ }
+ if (snd_pcm_hw_params_get_period_size (_play_hwpar, &fsize, &dir) || (fsize != _fsize) || dir)
+ {
+ if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't get requested period size for playback.\n");
+ return;
+ }
+ if (snd_pcm_hw_params_get_periods (_play_hwpar, &nfrag, &dir) || (nfrag != _nfrag) || dir)
+ {
+ if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't get requested number of periods for playback.\n");
+ return;
+ }
+
+ snd_pcm_hw_params_get_format (_play_hwpar, &_play_format);
+ snd_pcm_hw_params_get_access (_play_hwpar, &_play_access);
+
+#if __BYTE_ORDER == __LITTLE_ENDIAN
+ switch (_play_format)
+ {
+ case SND_PCM_FORMAT_FLOAT_LE:
+ _clear_func = &Alsa_pcmi::clear_32;
+ _play_func = &Alsa_pcmi::play_float;
+ break;
+
+ case SND_PCM_FORMAT_S32_LE:
+ _clear_func = &Alsa_pcmi::clear_32;
+ _play_func = &Alsa_pcmi::play_32;
+ break;
+
+ case SND_PCM_FORMAT_S32_BE:
+ _clear_func = &Alsa_pcmi::clear_32;
+ _play_func = &Alsa_pcmi::play_32swap;
+ break;
+
+ case SND_PCM_FORMAT_S24_3LE:
+ _clear_func = &Alsa_pcmi::clear_24;
+ _play_func = &Alsa_pcmi::play_24;
+ break;
+
+ case SND_PCM_FORMAT_S24_3BE:
+ _clear_func = &Alsa_pcmi::clear_24;
+ _play_func = &Alsa_pcmi::play_24swap;
+ break;
+
+ case SND_PCM_FORMAT_S16_LE:
+ _clear_func = &Alsa_pcmi::clear_16;
+ _play_func = &Alsa_pcmi::play_16;
+ break;
+
+ case SND_PCM_FORMAT_S16_BE:
+ _clear_func = &Alsa_pcmi::clear_16;
+ _play_func = &Alsa_pcmi::play_16swap;
+ break;
+
+ default:
+ if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't handle playback sample format.\n");
+ return;
+ }
+#elif __BYTE_ORDER == __BIG_ENDIAN
+ switch (_play_format)
+ {
+ case SND_PCM_FORMAT_S32_LE:
+ _clear_func = &Alsa_pcmi::clear_32;
+ _play_func = &Alsa_pcmi::play_32swap;
+ break;
+
+ case SND_PCM_FORMAT_S32_BE:
+ _clear_func = &Alsa_pcmi::clear_32;
+ _play_func = &Alsa_pcmi::play_32;
+ break;
+
+ case SND_PCM_FORMAT_S24_3LE:
+ _clear_func = &Alsa_pcmi::clear_24;
+ _play_func = &Alsa_pcmi::play_24swap;
+ break;
+
+ case SND_PCM_FORMAT_S24_3BE:
+ _clear_func = &Alsa_pcmi::clear_24;
+ _play_func = &Alsa_pcmi::play_24;
+ break;
+
+ case SND_PCM_FORMAT_S16_LE:
+ _clear_func = &Alsa_pcmi::clear_16;
+ _play_func = &Alsa_pcmi::play_16swap;
+ break;
+
+ case SND_PCM_FORMAT_S16_BE:
+ _clear_func = &Alsa_pcmi::clear_16;
+ _play_func = &Alsa_pcmi::play_16;
+ break;
+
+ default:
+ if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't handle playback sample format.\n");
+ return;
+ }
+#else
+#error "System byte order is undefined or not supported"
+#endif
+
+ _play_npfd = snd_pcm_poll_descriptors_count (_play_handle);
+ }
+
+ if (_capt_handle)
+ {
+ if (snd_pcm_hw_params_get_rate (_capt_hwpar, &fsamp, &dir) || (fsamp != _fsamp) || dir)
+ {
+ if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't get requested sample rate for capture.\n");
+ return;
+ }
+ if (snd_pcm_hw_params_get_period_size (_capt_hwpar, &fsize, &dir) || (fsize != _fsize) || dir)
+ {
+ if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't get requested period size for capture.\n");
+ return;
+ }
+ if (snd_pcm_hw_params_get_periods (_capt_hwpar, &nfrag, &dir) || (nfrag != _nfrag) || dir)
+ {
+ if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't get requested number of periods for capture.\n");
+ return;
+ }
+
+ if (_play_handle) _synced = ! snd_pcm_link (_play_handle, _capt_handle);
+
+ snd_pcm_hw_params_get_format (_capt_hwpar, &_capt_format);
+ snd_pcm_hw_params_get_access (_capt_hwpar, &_capt_access);
+
+#if __BYTE_ORDER == __LITTLE_ENDIAN
+ switch (_capt_format)
+ {
+ case SND_PCM_FORMAT_FLOAT_LE:
+ _capt_func = &Alsa_pcmi::capt_float;
+ break;
+
+ case SND_PCM_FORMAT_S32_LE:
+ _capt_func = &Alsa_pcmi::capt_32;
+ break;
+
+ case SND_PCM_FORMAT_S32_BE:
+ _capt_func = &Alsa_pcmi::capt_32swap;
+ break;
+
+ case SND_PCM_FORMAT_S24_3LE:
+ _capt_func = &Alsa_pcmi::capt_24;
+ break;
+
+ case SND_PCM_FORMAT_S24_3BE:
+ _capt_func = &Alsa_pcmi::capt_24swap;
+ break;
+
+ case SND_PCM_FORMAT_S16_LE:
+ _capt_func = &Alsa_pcmi::capt_16;
+ break;
+
+ case SND_PCM_FORMAT_S16_BE:
+ _capt_func = &Alsa_pcmi::capt_16swap;
+ break;
+
+ default:
+ if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't handle capture sample format.\n");
+ return;
+ }
+#elif __BYTE_ORDER == __BIG_ENDIAN
+ switch (_capt_format)
+ {
+ case SND_PCM_FORMAT_S32_LE:
+ _capt_func = &Alsa_pcmi::capt_32swap;
+ break;
+
+ case SND_PCM_FORMAT_S32_BE:
+ _capt_func = &Alsa_pcmi::capt_32;
+ break;
+
+ case SND_PCM_FORMAT_S24_3LE:
+ _capt_func = &Alsa_pcmi::capt_24swap;
+ break;
+
+ case SND_PCM_FORMAT_S24_3BE:
+ _capt_func = &Alsa_pcmi::capt_24;
+ break;
+
+ case SND_PCM_FORMAT_S16_LE:
+ _capt_func = &Alsa_pcmi::capt_16swap;
+ break;
+
+ case SND_PCM_FORMAT_S16_BE:
+ _capt_func = &Alsa_pcmi::capt_16;
+ break;
+
+ default:
+ if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't handle capture sample format.\n");
+ return;
+ }
+#else
+#error "System byte order is undefined or not supported"
+#endif
+
+ _capt_npfd = snd_pcm_poll_descriptors_count (_capt_handle);
+ }
+
+ if (_play_npfd + _capt_npfd > MAXPFD)
+ {
+ if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: interface requires more than %d pollfd\n", MAXPFD);
+ return;
+ }
+
+ _state = 0;
+}
+
+
+int Alsa_pcmi::set_hwpar (snd_pcm_t *handle, snd_pcm_hw_params_t *hwpar, const char *sname, unsigned int *nchan)
+{
+ bool err;
+
+ if (snd_pcm_hw_params_any (handle, hwpar) < 0)
+ {
+ if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: no %s hw configurations available.\n",
+ sname);
+ return -1;
+ }
+ if (snd_pcm_hw_params_set_periods_integer (handle, hwpar) < 0)
+ {
+ if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't set %s period size to integral value.\n",
+ sname);
+ return -1;
+ }
+ if ( (snd_pcm_hw_params_set_access (handle, hwpar, SND_PCM_ACCESS_MMAP_NONINTERLEAVED) < 0)
+ && (snd_pcm_hw_params_set_access (handle, hwpar, SND_PCM_ACCESS_MMAP_INTERLEAVED) < 0)
+ && (snd_pcm_hw_params_set_access (handle, hwpar, SND_PCM_ACCESS_MMAP_COMPLEX) < 0))
+ {
+ if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: the %s interface doesn't support mmap-based access.\n",
+ sname);
+ return -1;
+ }
+ if (_debug & FORCE_16B)
+ {
+ err = (snd_pcm_hw_params_set_format (handle, hwpar, SND_PCM_FORMAT_S16_LE) < 0)
+ && (snd_pcm_hw_params_set_format (handle, hwpar, SND_PCM_FORMAT_S16_BE) < 0);
+ }
+ else
+ {
+ err = (snd_pcm_hw_params_set_format (handle, hwpar, SND_PCM_FORMAT_FLOAT_LE) < 0)
+ && (snd_pcm_hw_params_set_format (handle, hwpar, SND_PCM_FORMAT_S32_LE) < 0)
+ && (snd_pcm_hw_params_set_format (handle, hwpar, SND_PCM_FORMAT_S32_BE) < 0)
+ && (snd_pcm_hw_params_set_format (handle, hwpar, SND_PCM_FORMAT_S24_3LE) < 0)
+ && (snd_pcm_hw_params_set_format (handle, hwpar, SND_PCM_FORMAT_S24_3BE) < 0)
+ && (snd_pcm_hw_params_set_format (handle, hwpar, SND_PCM_FORMAT_S16_LE) < 0)
+ && (snd_pcm_hw_params_set_format (handle, hwpar, SND_PCM_FORMAT_S16_BE) < 0);
+ }
+ if (err)
+ {
+ if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: no supported sample format on %s interface.\n.",
+ sname);
+ return -1;
+ }
+ if (snd_pcm_hw_params_set_rate (handle, hwpar, _fsamp, 0) < 0)
+ {
+ if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't set %s sample rate to %u.\n",
+ sname, _fsamp);
+ return -1;
+ }
+ snd_pcm_hw_params_get_channels_max (hwpar, nchan);
+ if (*nchan > 1024)
+ {
+ if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: detected more than 1024 %s channnels, reset to 2.\n",
+ sname);
+ *nchan = 2;
+ }
+ if (_debug & FORCE_2CH)
+ {
+ *nchan = 2;
+ }
+ if (*nchan > MAXCHAN)
+ {
+ if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: number of %s channels reduced to %d.\n",
+ sname, MAXCHAN);
+ *nchan = MAXCHAN;
+ }
+
+ if (snd_pcm_hw_params_set_channels (handle, hwpar, *nchan) < 0)
+ {
+ if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't set %s channel count to %u.\n",
+ sname, *nchan);
+ return -1;
+ }
+ if (snd_pcm_hw_params_set_period_size (handle, hwpar, _fsize, 0) < 0)
+ {
+ if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't set %s period size to %lu.\n",
+ sname, _fsize);
+ return -1;
+ }
+ if (snd_pcm_hw_params_set_periods (handle, hwpar, _nfrag, 0) < 0)
+ {
+ if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't set %s periods to %u.\n",
+ sname, _nfrag);
+ return -1;
+ }
+ if (snd_pcm_hw_params_set_buffer_size (handle, hwpar, _fsize * _nfrag) < 0)
+ {
+ if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't set %s buffer length to %lu.\n",
+ sname, _fsize * _nfrag);
+ return -1;
+ }
+ if (snd_pcm_hw_params (handle, hwpar) < 0)
+ {
+ if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't set %s hardware parameters.\n",
+ sname);
+ return -1;
+ }
+
+ return 0;
+}
+
+
+int Alsa_pcmi::set_swpar (snd_pcm_t *handle, snd_pcm_sw_params_t *swpar, const char *sname)
+{
+ int err;
+
+ snd_pcm_sw_params_current (handle, swpar);
+
+ if ((err = snd_pcm_sw_params_set_tstamp_mode (handle, swpar, SND_PCM_TSTAMP_MMAP)) < 0)
+ {
+ if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't set %s timestamp mode to %u.\n",
+ sname, SND_PCM_TSTAMP_MMAP);
+ return -1;
+ }
+ if ((err = snd_pcm_sw_params_set_avail_min (handle, swpar, _fsize)) < 0)
+ {
+ if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't set %s avail_min to %lu.\n",
+ sname, _fsize);
+ return -1;
+ }
+ if ((err = snd_pcm_sw_params (handle, swpar)) < 0)
+ {
+ if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't set %s software parameters.\n",
+ sname);
+ return -1;
+ }
+
+ return 0;
+}
+
+
+int Alsa_pcmi::recover (void)
+{
+ int err;
+ snd_pcm_status_t *stat;
+
+ snd_pcm_status_alloca (&stat);
+
+ if (_play_handle)
+ {
+ if ((err = snd_pcm_status (_play_handle, stat)) < 0)
+ {
+ if (_debug & DEBUG_STAT) fprintf (stderr, "Alsa_pcmi: pcm_status(play): %s\n",
+ snd_strerror (err));
+ }
+ _play_xrun = xruncheck (stat);
+ }
+ if (_capt_handle)
+ {
+ if ((err = snd_pcm_status (_capt_handle, stat)) < 0)
+ {
+ if (_debug & DEBUG_STAT) fprintf (stderr, "Alsa_pcmi: pcm_status(capt): %s\n",
+ snd_strerror (err));
+ }
+ _capt_xrun = xruncheck (stat);
+ }
+
+ if (pcm_stop ()) return -1;
+ if (_play_handle && ((err = snd_pcm_prepare (_play_handle)) < 0))
+ {
+ if (_debug & DEBUG_STAT) fprintf (stderr, "Alsa_pcmi: pcm_prepare(play): %s\n",
+ snd_strerror (err));
+ return -1;
+ }
+ if (_capt_handle && !_synced && ((err = snd_pcm_prepare (_capt_handle)) < 0))
+ {
+ if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: pcm_prepare(capt): %s\n",
+ snd_strerror (err));
+ return -1;
+ }
+ if (pcm_start ()) return -1;
+
+ return 0;
+}
+
+
+float Alsa_pcmi::xruncheck (snd_pcm_status_t *stat)
+{
+ struct timeval tupd, trig;
+ int ds, du;
+
+ if (snd_pcm_status_get_state (stat) == SND_PCM_STATE_XRUN)
+ {
+ snd_pcm_status_get_tstamp (stat, &tupd);
+ snd_pcm_status_get_trigger_tstamp (stat, &trig);
+ ds = tupd.tv_sec - trig.tv_sec;
+ du = tupd.tv_usec - trig.tv_usec;
+ if (du < 0)
+ {
+ du += 1000000;
+ ds -= 1;
+ }
+ return ds + 1e-6f * du;
+ }
+ return 0.0f;
+}
+
+
+char *Alsa_pcmi::clear_16 (char *dst, int nfrm)
+{
+ while (nfrm--)
+ {
+ *((short int *) dst) = 0;
+ dst += _play_step;
+ }
+ return dst;
+}
+
+char *Alsa_pcmi::clear_24 (char *dst, int nfrm)
+{
+ while (nfrm--)
+ {
+ dst [0] = 0;
+ dst [1] = 0;
+ dst [2] = 0;
+ dst += _play_step;
+ }
+ return dst;
+}
+
+char *Alsa_pcmi::clear_32 (char *dst, int nfrm)
+{
+ while (nfrm--)
+ {
+ *((int *) dst) = 0;
+ dst += _play_step;
+ }
+ return dst;
+}
+
+
+char *Alsa_pcmi::play_16 (const float *src, char *dst, int nfrm, int step)
+{
+ float s;
+ short int d;
+
+ while (nfrm--)
+ {
+ s = *src;
+ if (s > 1) d = 0x7fff;
+ else if (s < -1) d = 0x8001;
+ else d = (short int)((float) 0x7fff * s);
+ *((short int *) dst) = d;
+ dst += _play_step;
+ src += step;
+ }
+ return dst;
+}
+
+char *Alsa_pcmi::play_16swap (const float *src, char *dst, int nfrm, int step)
+{
+ float s;
+ short int d;
+
+ while (nfrm--)
+ {
+ s = *src;
+ if (s > 1) d = 0x7fff;
+ else if (s < -1) d = 0x8001;
+ else d = (short int)((float) 0x7fff * s);
+ dst [0] = d >> 8;
+ dst [1] = d;
+ dst += _play_step;
+ src += step;
+ }
+ return dst;
+}
+
+char *Alsa_pcmi::play_24 (const float *src, char *dst, int nfrm, int step)
+{
+ float s;
+ int d;
+
+ while (nfrm--)
+ {
+ s = *src;
+ if (s > 1) d = 0x007fffff;
+ else if (s < -1) d = 0x00800001;
+ else d = (int)((float) 0x007fffff * s);
+ dst [0] = d;
+ dst [1] = d >> 8;
+ dst [2] = d >> 16;
+ dst += _play_step;
+ src += step;
+ }
+ return dst;
+}
+
+char *Alsa_pcmi::play_24swap (const float *src, char *dst, int nfrm, int step)
+{
+ float s;
+ int d;
+
+ while (nfrm--)
+ {
+ s = *src;
+ if (s > 1) d = 0x007fffff;
+ else if (s < -1) d = 0x00800001;
+ else d = (int)((float) 0x007fffff * s);
+ dst [0] = d >> 16;
+ dst [1] = d >> 8;
+ dst [2] = d;
+ dst += _play_step;
+ src += step;
+ }
+ return dst;
+}
+
+char *Alsa_pcmi::play_32 (const float *src, char *dst, int nfrm, int step)
+{
+ float s;
+ int d;
+
+ while (nfrm--)
+ {
+ s = *src;
+ if (s > 1) d = 0x007fffff;
+ else if (s < -1) d = 0x00800001;
+ else d = (int)((float) 0x007fffff * s);
+ *((int *) dst) = d << 8;
+ dst += _play_step;
+ src += step;
+ }
+ return dst;
+}
+
+char *Alsa_pcmi::play_32swap (const float *src, char *dst, int nfrm, int step)
+{
+ float s;
+ int d;
+
+ while (nfrm--)
+ {
+ s = *src;
+ if (s > 1) d = 0x007fffff;
+ else if (s < -1) d = 0x00800001;
+ else d = (int)((float) 0x007fffff * s);
+ dst [0] = d >> 16;
+ dst [1] = d >> 8;
+ dst [2] = d;
+ dst [3] = 0;
+ dst += _play_step;
+ src += step;
+ }
+ return dst;
+}
+
+char *Alsa_pcmi::play_float (const float *src, char *dst, int nfrm, int step)
+{
+ while (nfrm--)
+ {
+ *((float *) dst) = *src;
+ dst += _play_step;
+ src += step;
+ }
+ return dst;
+}
+
+
+const char *Alsa_pcmi::capt_16 (const char *src, float *dst, int nfrm, int step)
+{
+ while (nfrm--)
+ {
+ const short int s = *((short int const *) src);
+ const float d = (float) s / (float) 0x7fff;
+ *dst = d;
+ dst += step;
+ src += _capt_step;
+ }
+ return src;
+}
+
+const char *Alsa_pcmi::capt_16swap (const char *src, float *dst, int nfrm, int step)
+{
+ float d;
+ short int s;
+
+ while (nfrm--)
+ {
+ s = (src [0] & 0xFF) << 8;
+ s += (src [1] & 0xFF);
+ d = (float) s / (float) 0x7fff;
+ *dst = d;
+ dst += step;
+ src += _capt_step;
+ }
+ return src;
+}
+
+const char *Alsa_pcmi::capt_24 (const char *src, float *dst, int nfrm, int step)
+{
+ float d;
+ int s;
+
+ while (nfrm--)
+ {
+ s = (src [0] & 0xFF);
+ s += (src [1] & 0xFF) << 8;
+ s += (src [2] & 0xFF) << 16;
+ if (s & 0x00800000) s-= 0x01000000;
+ d = (float) s / (float) 0x007fffff;
+ *dst = d;
+ dst += step;
+ src += _capt_step;
+ }
+ return src;
+}
+
+const char *Alsa_pcmi::capt_24swap (const char *src, float *dst, int nfrm, int step)
+{
+ float d;
+ int s;
+
+ while (nfrm--)
+ {
+ s = (src [0] & 0xFF) << 16;
+ s += (src [1] & 0xFF) << 8;
+ s += (src [2] & 0xFF);
+ if (s & 0x00800000) s-= 0x01000000;
+ d = (float) s / (float) 0x007fffff;
+ *dst = d;
+ dst += step;
+ src += _capt_step;
+ }
+ return src;
+}
+
+const char *Alsa_pcmi::capt_32 (const char *src, float *dst, int nfrm, int step)
+{
+ while (nfrm--)
+ {
+ const int s = *((int const *) src);
+ const float d = (float) s / (float) 0x7fffff00;
+ *dst = d;
+ dst += step;
+ src += _capt_step;
+ }
+ return src;
+}
+
+const char *Alsa_pcmi::capt_32swap (const char *src, float *dst, int nfrm, int step)
+{
+ float d;
+ int s;
+
+ while (nfrm--)
+ {
+ s = (src [0] & 0xFF) << 24;
+ s += (src [1] & 0xFF) << 16;
+ s += (src [2] & 0xFF) << 8;
+ d = (float) s / (float) 0x7fffff00;
+ *dst = d;
+ dst += step;
+ src += _capt_step;
+ }
+ return src;
+}
+
+const char *Alsa_pcmi::capt_float (const char *src, float *dst, int nfrm, int step)
+{
+ while (nfrm--)
+ {
+ *dst = *((float const *) src);
+ dst += step;
+ src += _capt_step;
+ }
+ return src;
+}
--- /dev/null
+// ----------------------------------------------------------------------------
+//
+// Copyright (C) 2006-2012 Fons Adriaensen <fons@linuxaudio.org>
+//
+// This program is free software; you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation; either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program 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 for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program. If not, see <http://www.gnu.org/licenses/>.
+//
+// ----------------------------------------------------------------------------
+
+
+#ifndef _ZITA_ALSA_PCMI_H_
+#define _ZITA_ALSA_PCMI_H_
+
+
+#define ALSA_PCM_NEW_HW_PARAMS_API
+#define ALSA_PCM_NEW_SW_PARAMS_API
+#include <alsa/asoundlib.h>
+
+
+#define ZITA_ALSA_PCMI_MAJOR_VERSION 0
+#define ZITA_ALSA_PCMI_MINOR_VERSION 2
+
+#include <stdint.h>
+
+extern int zita_alsa_pcmi_major_version (void);
+extern int zita_alsa_pcmi_minor_version (void);
+
+
+class Alsa_pcmi
+{
+public:
+
+ Alsa_pcmi (
+ const char *play_name,
+ const char *capt_name,
+ const char *ctrl_name,
+ unsigned int rate,
+ unsigned int frsize,
+ unsigned int nfrags,
+ unsigned int debug = 0);
+
+ ~Alsa_pcmi (void);
+
+ enum
+ {
+ DEBUG_INIT = 1,
+ DEBUG_STAT = 2,
+ DEBUG_WAIT = 4,
+ DEBUG_DATA = 8,
+ DEBUG_ALL = 15,
+ FORCE_16B = 256,
+ FORCE_2CH = 512
+ };
+
+ void printinfo (void);
+
+ int pcm_start (void);
+ int pcm_stop (void);
+ snd_pcm_sframes_t pcm_wait (void);
+ int pcm_idle (int len);
+
+ int play_init (snd_pcm_uframes_t len);
+ void clear_chan (int chan, int len);
+ void play_chan (int chan, const float *src, int len, int step = 1);
+ int play_done (int len);
+
+ int capt_init (snd_pcm_uframes_t len);
+ void capt_chan (int chan, float *dst, int len, int step = 1);
+ int capt_done (int len);
+
+ int play_avail (void)
+ {
+ return snd_pcm_avail (_play_handle);
+ }
+
+ int capt_avail (void)
+ {
+ return snd_pcm_avail (_capt_handle);
+ }
+
+ int play_delay (void)
+ {
+ long k;
+ snd_pcm_delay (_play_handle, &k);
+ return k;
+ }
+
+ int capt_delay (void)
+ {
+ long k;
+ snd_pcm_delay (_capt_handle, &k);
+ return k;
+ }
+
+ float play_xrun (void) const { return _play_xrun; }
+ float capt_xrun (void) const { return _capt_xrun; }
+
+ int state (void) const { return _state; }
+ size_t fsize (void) const { return _fsize; }
+ uint32_t fsamp (void) const { return _fsamp; }
+ uint32_t nfrag (void) const { return _nfrag; }
+ uint32_t nplay (void) const { return _play_nchan; }
+ uint32_t ncapt (void) const { return _capt_nchan; }
+ snd_pcm_t *play_handle (void) const { return _play_handle; }
+ snd_pcm_t *capt_handle (void) const { return _capt_handle; }
+
+
+private:
+
+ typedef char *(Alsa_pcmi::*clear_function)(char *, int);
+ typedef char *(Alsa_pcmi::*play_function)(const float *, char *, int, int);
+ typedef const char *(Alsa_pcmi::*capt_function) (const char *, float *, int, int);
+
+ enum { MAXPFD = 16, MAXCHAN = 64 };
+
+ void initialise (const char *play_name, const char *capt_name, const char *ctrl_name);
+ int set_hwpar (snd_pcm_t *handle, snd_pcm_hw_params_t *hwpar, const char *sname, unsigned int *nchan);
+ int set_swpar (snd_pcm_t *handle, snd_pcm_sw_params_t *swpar, const char *sname);
+ int recover (void);
+ float xruncheck (snd_pcm_status_t *stat);
+
+ char *clear_32 (char *dst, int nfrm);
+ char *clear_24 (char *dst, int nfrm);
+ char *clear_16 (char *dst, int nfrm);
+
+ char *play_float (const float *src, char *dst, int nfrm, int step);
+ char *play_32 (const float *src, char *dst, int nfrm, int step);
+ char *play_24 (const float *src, char *dst, int nfrm, int step);
+ char *play_16 (const float *src, char *dst, int nfrm, int step);
+ char *play_32swap (const float *src, char *dst, int nfrm, int step);
+ char *play_24swap (const float *src, char *dst, int nfrm, int step);
+ char *play_16swap (const float *src, char *dst, int nfrm, int step);
+
+ const char *capt_float (const char *src, float *dst, int nfrm, int step);
+ const char *capt_32 (const char *src, float *dst, int nfrm, int step);
+ const char *capt_24 (const char *src, float *dst, int nfrm, int step);
+ const char *capt_16 (const char *src, float *dst, int nfrm, int step);
+ const char *capt_32swap (const char *src, float *dst, int nfrm, int step);
+ const char *capt_24swap (const char *src, float *dst, int nfrm, int step);
+ const char *capt_16swap (const char *src, float *dst, int nfrm, int step);
+
+ unsigned int _fsamp;
+ snd_pcm_uframes_t _fsize;
+ unsigned int _nfrag;
+ unsigned int _debug;
+ int _state;
+ snd_pcm_t *_play_handle;
+ snd_pcm_t *_capt_handle;
+ snd_ctl_t *_ctrl_handle;
+ snd_pcm_hw_params_t *_play_hwpar;
+ snd_pcm_sw_params_t *_play_swpar;
+ snd_pcm_hw_params_t *_capt_hwpar;
+ snd_pcm_sw_params_t *_capt_swpar;
+ snd_pcm_format_t _play_format;
+ snd_pcm_format_t _capt_format;
+ snd_pcm_access_t _play_access;
+ snd_pcm_access_t _capt_access;
+ unsigned int _play_nchan;
+ unsigned int _capt_nchan;
+ float _play_xrun;
+ float _capt_xrun;
+ bool _synced;
+ int _play_npfd;
+ int _capt_npfd;
+ struct pollfd _poll_fd [MAXPFD];
+ snd_pcm_uframes_t _capt_offs;
+ snd_pcm_uframes_t _play_offs;
+ int _play_step;
+ int _capt_step;
+ char *_play_ptr [MAXCHAN];
+ const char *_capt_ptr [MAXCHAN];
+ clear_function _clear_func;
+ play_function _play_func;
+ capt_function _capt_func;
+ void *_dummy [16];
+};
+
+#endif
from waflib import Options
import os
import sys
+import re
# Mandatory variables
top = '.'
if Options.options.build_dummy:
backends += [ 'dummy' ]
+ if re.search ("linux", sys.platform) != None:
+ backends += [ 'alsa' ]
+
for i in backends:
sub_config_and_use(conf, i)
if bld.is_defined('HAVE_DUMMY'):
backends += [ 'dummy' ]
+ if re.search ("linux", sys.platform) != None:
+ if bld.is_defined('HAVE_ALSA'):
+ backends += [ 'alsa' ]
+
for i in backends:
bld.recurse(i)
projects / ardour.git / commitdiff