OBJS += glwidget.moc.o mainwindow.moc.o vumeter.moc.o lrameter.moc.o correlation_meter.moc.o aboutdialog.moc.o ellipsis_label.moc.o input_mapping_dialog.moc.o nonlinear_fader.moc.o clickable_label.moc.o
# Mixer objects
-AUDIO_MIXER_OBJS = audio_mixer.o alsa_input.o ebu_r128_proc.o stereocompressor.o resampling_queue.o flags.o correlation_measurer.o filter.o input_mapping.o state.pb.o
+AUDIO_MIXER_OBJS = audio_mixer.o alsa_input.o alsa_pool.o ebu_r128_proc.o stereocompressor.o resampling_queue.o flags.o correlation_measurer.o filter.o input_mapping.o state.pb.o
OBJS += mixer.o pbo_frame_allocator.o context.o ref_counted_frame.o theme.o httpd.o flags.o image_input.o alsa_output.o disk_space_estimator.o $(AUDIO_MIXER_OBJS)
# Streaming and encoding objects
#include "alsa_input.h"
-#include "audio_mixer.h"
-#include "defs.h"
-#include "state.pb.h"
-#include <sys/inotify.h>
+#include <alsa/error.h>
+#include <assert.h>
+#include <errno.h>
+#include <stdio.h>
+#include <unistd.h>
-#include <algorithm>
-#include <functional>
-#include <unordered_map>
+#include "alsa_pool.h"
+#include "bmusb/bmusb.h"
+#include "timebase.h"
using namespace std;
using namespace std::placeholders;
-namespace {
-
-bool set_base_params(const char *device_name, snd_pcm_t *pcm_handle, snd_pcm_hw_params_t *hw_params, unsigned *sample_rate)
-{
- int err;
- err = snd_pcm_hw_params_any(pcm_handle, hw_params);
- if (err < 0) {
- fprintf(stderr, "[%s] snd_pcm_hw_params_any(): %s\n", device_name, snd_strerror(err));
- return false;
- }
- err = snd_pcm_hw_params_set_access(pcm_handle, hw_params, SND_PCM_ACCESS_RW_INTERLEAVED);
- if (err < 0) {
- fprintf(stderr, "[%s] snd_pcm_hw_params_set_access(): %s\n", device_name, snd_strerror(err));
- return false;
- }
- snd_pcm_format_mask_t *format_mask;
- snd_pcm_format_mask_alloca(&format_mask);
- snd_pcm_format_mask_set(format_mask, SND_PCM_FORMAT_S16_LE);
- snd_pcm_format_mask_set(format_mask, SND_PCM_FORMAT_S24_LE);
- snd_pcm_format_mask_set(format_mask, SND_PCM_FORMAT_S32_LE);
- err = snd_pcm_hw_params_set_format_mask(pcm_handle, hw_params, format_mask);
- if (err < 0) {
- fprintf(stderr, "[%s] snd_pcm_hw_params_set_format_mask(): %s\n", device_name, snd_strerror(err));
- return false;
- }
- err = snd_pcm_hw_params_set_rate_near(pcm_handle, hw_params, sample_rate, 0);
- if (err < 0) {
- fprintf(stderr, "[%s] snd_pcm_hw_params_set_rate_near(): %s\n", device_name, snd_strerror(err));
- return false;
- }
- return true;
-}
-
-} // namespace
-
#define RETURN_ON_ERROR(msg, expr) do { \
int err = (expr); \
if (err < 0) { \
return true;
}
+bool ALSAInput::set_base_params(const char *device_name, snd_pcm_t *pcm_handle, snd_pcm_hw_params_t *hw_params, unsigned *sample_rate)
+{
+ int err;
+ err = snd_pcm_hw_params_any(pcm_handle, hw_params);
+ if (err < 0) {
+ fprintf(stderr, "[%s] snd_pcm_hw_params_any(): %s\n", device_name, snd_strerror(err));
+ return false;
+ }
+ err = snd_pcm_hw_params_set_access(pcm_handle, hw_params, SND_PCM_ACCESS_RW_INTERLEAVED);
+ if (err < 0) {
+ fprintf(stderr, "[%s] snd_pcm_hw_params_set_access(): %s\n", device_name, snd_strerror(err));
+ return false;
+ }
+ snd_pcm_format_mask_t *format_mask;
+ snd_pcm_format_mask_alloca(&format_mask);
+ snd_pcm_format_mask_set(format_mask, SND_PCM_FORMAT_S16_LE);
+ snd_pcm_format_mask_set(format_mask, SND_PCM_FORMAT_S24_LE);
+ snd_pcm_format_mask_set(format_mask, SND_PCM_FORMAT_S32_LE);
+ err = snd_pcm_hw_params_set_format_mask(pcm_handle, hw_params, format_mask);
+ if (err < 0) {
+ fprintf(stderr, "[%s] snd_pcm_hw_params_set_format_mask(): %s\n", device_name, snd_strerror(err));
+ return false;
+ }
+ err = snd_pcm_hw_params_set_rate_near(pcm_handle, hw_params, sample_rate, 0);
+ if (err < 0) {
+ fprintf(stderr, "[%s] snd_pcm_hw_params_set_rate_near(): %s\n", device_name, snd_strerror(err));
+ return false;
+ }
+ return true;
+}
+
ALSAInput::~ALSAInput()
{
if (pcm_handle) {
return (n * TIMEBASE) / sample_rate;
}
-ALSAPool::~ALSAPool()
-{
- for (Device &device : devices) {
- if (device.input != nullptr) {
- device.input->stop_capture_thread();
- }
- }
-}
-
-std::vector<ALSAPool::Device> ALSAPool::get_devices()
-{
- lock_guard<mutex> lock(mu);
- for (Device &device : devices) {
- device.held = true;
- }
- return devices;
-}
-
-void ALSAPool::hold_device(unsigned index)
-{
- lock_guard<mutex> lock(mu);
- assert(index < devices.size());
- devices[index].held = true;
-}
-
-void ALSAPool::release_device(unsigned index)
-{
- lock_guard<mutex> lock(mu);
- if (index < devices.size()) {
- devices[index].held = false;
- }
-}
-
-void ALSAPool::enumerate_devices()
-{
- // Enumerate all cards.
- for (int card_index = -1; snd_card_next(&card_index) == 0 && card_index >= 0; ) {
- char address[256];
- snprintf(address, sizeof(address), "hw:%d", card_index);
-
- snd_ctl_t *ctl;
- int err = snd_ctl_open(&ctl, address, 0);
- if (err < 0) {
- printf("%s: %s\n", address, snd_strerror(err));
- continue;
- }
- unique_ptr<snd_ctl_t, decltype(snd_ctl_close)*> ctl_closer(ctl, snd_ctl_close);
-
- // Enumerate all devices on this card.
- for (int dev_index = -1; snd_ctl_pcm_next_device(ctl, &dev_index) == 0 && dev_index >= 0; ) {
- probe_device_with_retry(card_index, dev_index);
- }
- }
-}
-
-void ALSAPool::probe_device_with_retry(unsigned card_index, unsigned dev_index)
-{
- char address[256];
- snprintf(address, sizeof(address), "hw:%d,%d", card_index, dev_index);
-
- lock_guard<mutex> lock(add_device_mutex);
- if (add_device_tries_left.count(address)) {
- // Some thread is already busy retrying this,
- // so just reset its count.
- add_device_tries_left[address] = num_retries;
- return;
- }
-
- // Try (while still holding the lock) to add the device synchronously.
- ProbeResult result = probe_device_once(card_index, dev_index);
- if (result == ProbeResult::SUCCESS) {
- return;
- } else if (result == ProbeResult::FAILURE) {
- return;
- }
- assert(result == ProbeResult::DEFER);
-
- // Add failed for whatever reason (probably just that the device
- // isn't up yet. Set up a count so that nobody else starts a thread,
- // then start it ourselves.
- fprintf(stderr, "Trying %s again in one second...\n", address);
- add_device_tries_left[address] = num_retries;
- thread(&ALSAPool::probe_device_retry_thread_func, this, card_index, dev_index).detach();
-}
-
-void ALSAPool::probe_device_retry_thread_func(unsigned card_index, unsigned dev_index)
-{
- char address[256];
- snprintf(address, sizeof(address), "hw:%d,%d", card_index, dev_index);
-
- for ( ;; ) { // Termination condition within the loop.
- sleep(1);
-
- // See if there are any retries left.
- lock_guard<mutex> lock(add_device_mutex);
- if (!add_device_tries_left.count(address) ||
- add_device_tries_left[address] == 0) {
- add_device_tries_left.erase(address);
- fprintf(stderr, "Giving up probe of %s.\n", address);
- return;
- }
-
- // Seemingly there were. Give it a try (we still hold the mutex).
- ProbeResult result = probe_device_once(card_index, dev_index);
- if (result == ProbeResult::SUCCESS) {
- add_device_tries_left.erase(address);
- fprintf(stderr, "Probe of %s succeeded.\n", address);
- return;
- } else if (result == ProbeResult::FAILURE || --add_device_tries_left[address] == 0) {
- add_device_tries_left.erase(address);
- fprintf(stderr, "Giving up probe of %s.\n", address);
- return;
- }
-
- // Failed again.
- assert(result == ProbeResult::DEFER);
- fprintf(stderr, "Trying %s again in one second (%d tries left)...\n",
- address, add_device_tries_left[address]);
- }
-}
-
-ALSAPool::ProbeResult ALSAPool::probe_device_once(unsigned card_index, unsigned dev_index)
-{
- char address[256];
- snprintf(address, sizeof(address), "hw:%d", card_index);
- snd_ctl_t *ctl;
- int err = snd_ctl_open(&ctl, address, 0);
- if (err < 0) {
- printf("%s: %s\n", address, snd_strerror(err));
- return ALSAPool::ProbeResult::DEFER;
- }
- unique_ptr<snd_ctl_t, decltype(snd_ctl_close)*> ctl_closer(ctl, snd_ctl_close);
-
- snd_pcm_info_t *pcm_info;
- snd_pcm_info_alloca(&pcm_info);
- snd_pcm_info_set_device(pcm_info, dev_index);
- snd_pcm_info_set_subdevice(pcm_info, 0);
- snd_pcm_info_set_stream(pcm_info, SND_PCM_STREAM_CAPTURE);
- if (snd_ctl_pcm_info(ctl, pcm_info) < 0) {
- // Not available for capture.
- printf("%s: Not available for capture.\n", address);
- return ALSAPool::ProbeResult::DEFER;
- }
-
- snprintf(address, sizeof(address), "hw:%d,%d", card_index, dev_index);
-
- unsigned num_channels = 0;
-
- // Find all channel maps for this device, and pick out the one
- // with the most channels.
- snd_pcm_chmap_query_t **cmaps = snd_pcm_query_chmaps_from_hw(card_index, dev_index, 0, SND_PCM_STREAM_CAPTURE);
- if (cmaps != nullptr) {
- for (snd_pcm_chmap_query_t **ptr = cmaps; *ptr; ++ptr) {
- num_channels = max(num_channels, (*ptr)->map.channels);
- }
- snd_pcm_free_chmaps(cmaps);
- }
- if (num_channels == 0) {
- // Device had no channel maps. We need to open it to query.
- // TODO: Do this asynchronously.
- snd_pcm_t *pcm_handle;
- int err = snd_pcm_open(&pcm_handle, address, SND_PCM_STREAM_CAPTURE, 0);
- if (err < 0) {
- printf("%s: %s\n", address, snd_strerror(err));
- return ALSAPool::ProbeResult::DEFER;
- }
- snd_pcm_hw_params_t *hw_params;
- snd_pcm_hw_params_alloca(&hw_params);
- unsigned sample_rate;
- if (!set_base_params(address, pcm_handle, hw_params, &sample_rate)) {
- snd_pcm_close(pcm_handle);
- return ALSAPool::ProbeResult::DEFER;
- }
- err = snd_pcm_hw_params_get_channels_max(hw_params, &num_channels);
- if (err < 0) {
- fprintf(stderr, "[%s] snd_pcm_hw_params_get_channels_max(): %s\n",
- address, snd_strerror(err));
- snd_pcm_close(pcm_handle);
- return ALSAPool::ProbeResult::DEFER;
- }
- snd_pcm_close(pcm_handle);
- }
-
- if (num_channels == 0) {
- printf("%s: No channel maps with channels\n", address);
- return ALSAPool::ProbeResult::FAILURE;
- }
-
- snd_ctl_card_info_t *card_info;
- snd_ctl_card_info_alloca(&card_info);
- snd_ctl_card_info(ctl, card_info);
-
- string name = snd_ctl_card_info_get_name(card_info);
- string info = snd_pcm_info_get_name(pcm_info);
-
- unsigned internal_dev_index;
- string display_name;
- {
- lock_guard<mutex> lock(mu);
- internal_dev_index = find_free_device_index(name, info, num_channels, address);
- devices[internal_dev_index].address = address;
- devices[internal_dev_index].name = name;
- devices[internal_dev_index].info = info;
- devices[internal_dev_index].num_channels = num_channels;
- // Note: Purposefully does not overwrite held.
-
- display_name = devices[internal_dev_index].display_name();
- }
-
- fprintf(stderr, "%s: Probed successfully.\n", address);
-
- reset_device(internal_dev_index); // Restarts it if it is held (ie., we just replaced a dead card).
-
- DeviceSpec spec{InputSourceType::ALSA_INPUT, internal_dev_index};
- global_audio_mixer->set_display_name(spec, display_name);
- global_audio_mixer->trigger_state_changed_callback();
-
- return ALSAPool::ProbeResult::SUCCESS;
-}
-
-void ALSAPool::unplug_device(unsigned card_index, unsigned dev_index)
-{
- char address[256];
- snprintf(address, sizeof(address), "hw:%d,%d", card_index, dev_index);
- for (unsigned i = 0; i < devices.size(); ++i) {
- if (devices[i].state != Device::State::EMPTY &&
- devices[i].state != Device::State::DEAD &&
- devices[i].address == address) {
- free_card(i);
- }
- }
-}
-
-void ALSAPool::init()
-{
- thread(&ALSAPool::inotify_thread_func, this).detach();
- enumerate_devices();
-}
-
-void ALSAPool::inotify_thread_func()
-{
- int inotify_fd = inotify_init();
- if (inotify_fd == -1) {
- perror("inotify_init()");
- fprintf(stderr, "No hotplug of ALSA devices available.\n");
- return;
- }
-
- int watch_fd = inotify_add_watch(inotify_fd, "/dev/snd", IN_MOVE | IN_CREATE | IN_DELETE);
- if (watch_fd == -1) {
- perror("inotify_add_watch()");
- fprintf(stderr, "No hotplug of ALSA devices available.\n");
- close(inotify_fd);
- return;
- }
-
- int size = sizeof(inotify_event) + NAME_MAX + 1;
- unique_ptr<char[]> buf(new char[size]);
- for ( ;; ) {
- int ret = read(inotify_fd, buf.get(), size);
- if (ret < int(sizeof(inotify_event))) {
- fprintf(stderr, "inotify read unexpectedly returned %d, giving up hotplug of ALSA devices.\n",
- int(ret));
- close(watch_fd);
- close(inotify_fd);
- return;
- }
-
- for (int i = 0; i < ret; ) {
- const inotify_event *event = reinterpret_cast<const inotify_event *>(&buf[i]);
- i += sizeof(inotify_event) + event->len;
-
- if (event->mask & IN_Q_OVERFLOW) {
- fprintf(stderr, "WARNING: inotify overflowed, may lose ALSA hotplug events.\n");
- continue;
- }
- unsigned card, device;
- char type;
- if (sscanf(event->name, "pcmC%uD%u%c", &card, &device, &type) == 3 && type == 'c') {
- if (event->mask & (IN_MOVED_FROM | IN_DELETE)) {
- printf("Deleted capture device: Card %u, device %u\n", card, device);
- unplug_device(card, device);
- }
- if (event->mask & (IN_MOVED_TO | IN_CREATE)) {
- printf("Adding capture device: Card %u, device %u\n", card, device);
- probe_device_with_retry(card, device);
- }
- }
- }
- }
-}
-
-void ALSAPool::reset_device(unsigned index)
-{
- lock_guard<mutex> lock(mu);
- Device *device = &devices[index];
- if (inputs[index] != nullptr) {
- inputs[index]->stop_capture_thread();
- }
- if (!device->held) {
- inputs[index].reset();
- } else {
- // TODO: Put on a background thread instead of locking?
- auto callback = bind(&AudioMixer::add_audio, global_audio_mixer, DeviceSpec{InputSourceType::ALSA_INPUT, index}, _1, _2, _3, _4);
- inputs[index].reset(new ALSAInput(device->address.c_str(), OUTPUT_FREQUENCY, device->num_channels, callback, this, index));
- inputs[index]->start_capture_thread();
- }
- device->input = inputs[index].get();
-}
-
-unsigned ALSAPool::get_capture_frequency(unsigned index)
-{
- lock_guard<mutex> lock(mu);
- assert(devices[index].held);
- if (devices[index].input)
- return devices[index].input->get_sample_rate();
- else
- return OUTPUT_FREQUENCY;
-}
-
-ALSAPool::Device::State ALSAPool::get_card_state(unsigned index)
-{
- lock_guard<mutex> lock(mu);
- assert(devices[index].held);
- return devices[index].state;
-}
-
-void ALSAPool::set_card_state(unsigned index, ALSAPool::Device::State state)
-{
- {
- lock_guard<mutex> lock(mu);
- devices[index].state = state;
- }
-
- DeviceSpec spec{InputSourceType::ALSA_INPUT, index};
- bool silence = (state != ALSAPool::Device::State::RUNNING);
- while (!global_audio_mixer->silence_card(spec, silence))
- ;
- global_audio_mixer->trigger_state_changed_callback();
-}
-
-unsigned ALSAPool::find_free_device_index(const string &name, const string &info, unsigned num_channels, const string &address)
-{
- // First try to find an exact match on a dead card.
- for (unsigned i = 0; i < devices.size(); ++i) {
- if (devices[i].state == Device::State::DEAD &&
- devices[i].address == address &&
- devices[i].name == name &&
- devices[i].info == info &&
- devices[i].num_channels == num_channels) {
- devices[i].state = Device::State::READY;
- return i;
- }
- }
-
- // Then try to find a match on everything but the address
- // (probably that devices were plugged back in a different order).
- // If we have two cards that are equal, this might get them mixed up,
- // but we don't have anything better.
- for (unsigned i = 0; i < devices.size(); ++i) {
- if (devices[i].state == Device::State::DEAD &&
- devices[i].name == name &&
- devices[i].info == info &&
- devices[i].num_channels == num_channels) {
- devices[i].state = Device::State::READY;
- return i;
- }
- }
-
- // OK, so we didn't find a match; see if there are any empty slots.
- for (unsigned i = 0; i < devices.size(); ++i) {
- if (devices[i].state == Device::State::EMPTY) {
- devices[i].state = Device::State::READY;
- devices[i].held = false;
- return i;
- }
- }
-
- // Failing that, we just insert the new device at the end.
- Device new_dev;
- new_dev.state = Device::State::READY;
- new_dev.held = false;
- devices.push_back(new_dev);
- inputs.emplace_back(nullptr);
- return devices.size() - 1;
-}
-
-unsigned ALSAPool::create_dead_card(const string &name, const string &info, unsigned num_channels)
-{
- lock_guard<mutex> lock(mu);
-
- // See if there are any empty slots. If not, insert one at the end.
- vector<Device>::iterator free_device =
- find_if(devices.begin(), devices.end(),
- [](const Device &device) { return device.state == Device::State::EMPTY; });
- if (free_device == devices.end()) {
- devices.push_back(Device());
- inputs.emplace_back(nullptr);
- free_device = devices.end() - 1;
- }
-
- free_device->state = Device::State::DEAD;
- free_device->name = name;
- free_device->info = info;
- free_device->num_channels = num_channels;
- free_device->held = true;
-
- return distance(devices.begin(), free_device);
-}
-
-void ALSAPool::serialize_device(unsigned index, DeviceSpecProto *serialized)
-{
- lock_guard<mutex> lock(mu);
- assert(index < devices.size());
- assert(devices[index].held);
- serialized->set_type(DeviceSpecProto::ALSA_INPUT);
- serialized->set_index(index);
- serialized->set_display_name(devices[index].display_name());
- serialized->set_alsa_name(devices[index].name);
- serialized->set_alsa_info(devices[index].info);
- serialized->set_num_channels(devices[index].num_channels);
- serialized->set_address(devices[index].address);
-}
-
-void ALSAPool::free_card(unsigned index)
-{
- DeviceSpec spec{InputSourceType::ALSA_INPUT, index};
- while (!global_audio_mixer->silence_card(spec, true))
- ;
-
- {
- lock_guard<mutex> lock(mu);
- if (devices[index].held) {
- devices[index].state = Device::State::DEAD;
- } else {
- devices[index].state = Device::State::EMPTY;
- inputs[index].reset();
- }
- while (!devices.empty() && devices.back().state == Device::State::EMPTY) {
- devices.pop_back();
- inputs.pop_back();
- }
- }
-
- global_audio_mixer->trigger_state_changed_callback();
-}
// as a whole, since that's what AudioMixer::add_audio() wants.
#include <alsa/asoundlib.h>
-
+#include <alsa/pcm.h>
+#include <stdint.h>
+#include <sys/types.h>
#include <atomic>
#include <functional>
#include <string>
void start_capture_thread();
void stop_capture_thread();
+ // Set access, sample rate and format parameters on the given ALSA PCM handle.
+ // Returns the computed parameter set and the chosen sample rate. Note that
+ // sample_rate is an in/out parameter; you send in the desired rate,
+ // and ALSA picks one as close to that as possible.
+ static bool set_base_params(const char *device_name, snd_pcm_t *pcm_handle, snd_pcm_hw_params_t *hw_params, unsigned *sample_rate);
+
private:
void capture_thread_func();
int64_t frames_to_pts(uint64_t n) const;
unsigned internal_dev_index;
};
-// The class dealing with the collective of all ALSA cards in the system.
-// In particular, it deals with enumeration of cards, and hotplug of new ones.
-class ALSAPool {
-public:
- ~ALSAPool();
-
- struct Device {
- enum class State {
- // There is no card here. (There probably used to be one,
- // but it got removed.) We don't insert a card before
- // we've actually probed it, ie., we know whether it
- // can be captured from at all, and what its name is.
- EMPTY,
-
- // This card is ready for capture, as far as we know.
- // (It could still be used by someone else; we don't know
- // until we try to open it.)
- READY,
-
- // We are trying to start capture from this card, but we are not
- // streaming yet. Note that this could in theory go on forever,
- // if the card is in use by some other process; in the UI,
- // we will show this state as “(busy)”.
- STARTING,
-
- // The card is capturing and sending data. If there's a fatal error,
- // it could go back to STARTING, or it could go to DEAD
- // (depending on the error).
- RUNNING,
-
- // The card is gone (e.g., unplugged). However, since there's
- // still a bus using it, we can't just remove the entry.
- // If the card comes back (ie., a new card is plugged in,
- // and we believe it has the same configuration), it could be
- // installed in place of this card, and then presumably be put
- // back into STARTING or RUNNING.
- DEAD
- } state = State::EMPTY;
-
- std::string address; // E.g. “hw:0,0”.
- std::string name, info;
- unsigned num_channels;
- ALSAInput *input = nullptr; // nullptr iff EMPTY or DEAD.
-
- // Whether the AudioMixer is interested in this card or not.
- // “Interested” could mean either of two things: Either it is part of
- // a bus mapping, or it is in the process of enumerating devices
- // (to show to the user). A card that is _not_ held can disappear
- // at any given time as a result of an error or hotplug event;
- // a card that is held will go to the DEAD state instead.
- bool held = false;
-
- std::string display_name() const { return name + " (" + info + ")"; }
- };
-
- void init();
-
- // Get the list of all current devices. Note that this will implicitly mark
- // all of the returned devices as held, since the input mapping UI needs
- // some kind of stability when the user is to choose. Thus, when you are done
- // with the list and have set a new mapping, you must go through all the devices
- // you don't want and release them using release_device().
- std::vector<Device> get_devices();
-
- void hold_device(unsigned index);
- void release_device(unsigned index); // Note: index is allowed to go out of bounds.
-
- // If device is held, start or restart capture. If device is not held,
- // stop capture if it isn't already.
- void reset_device(unsigned index);
-
- // Note: The card must be held. Returns OUTPUT_FREQUENCY if the card is in EMPTY or DEAD.
- unsigned get_capture_frequency(unsigned index);
-
- // Note: The card must be held.
- Device::State get_card_state(unsigned index);
-
- // Only for ALSAInput.
- void set_card_state(unsigned index, Device::State state);
-
- // Just a short form for taking <mu> and then moving the card to
- // EMPTY or DEAD state. Only for ALSAInput and for internal use.
- void free_card(unsigned index);
-
- // Create a new card, mark it immediately as DEAD and hold it.
- // Returns the new index.
- unsigned create_dead_card(const std::string &name, const std::string &info, unsigned num_channels);
-
- // Make a protobuf representation of the given card, so that it can be
- // matched against at a later stage. For AudioMixer only.
- // The given card must be held.
- void serialize_device(unsigned index, DeviceSpecProto *serialized);
-
-private:
- mutable std::mutex mu;
- std::vector<Device> devices; // Under mu.
- std::vector<std::unique_ptr<ALSAInput>> inputs; // Under mu, corresponds 1:1 to devices.
-
- // Keyed on device address (e.g. “hw:0,0”). If there's an entry here,
- // it means we already have a thread doing retries, so we shouldn't
- // start a new one.
- std::unordered_map<std::string, unsigned> add_device_tries_left; // Under add_device_mutex.
- std::mutex add_device_mutex;
-
- static constexpr int num_retries = 10;
-
- void inotify_thread_func();
- void enumerate_devices();
-
- // Try to add an input at the given card/device. If it succeeds, return
- // synchronously. If not, fire off a background thread to try up to
- // <num_retries> times.
- void probe_device_with_retry(unsigned card_index, unsigned dev_index);
- void probe_device_retry_thread_func(unsigned card_index, unsigned dev_index);
-
- enum class ProbeResult {
- SUCCESS,
- DEFER,
- FAILURE
- };
- ProbeResult probe_device_once(unsigned card_index, unsigned dev_index);
-
- void unplug_device(unsigned card_index, unsigned dev_index);
-
- // Must be called with <mu> held. Will allocate a new entry if needed.
- // The returned entry will be set to READY state.
- unsigned find_free_device_index(const std::string &name,
- const std::string &info,
- unsigned num_channels,
- const std::string &address);
-
- friend class ALSAInput;
-};
-
#endif // !defined(_ALSA_INPUT_H)
--- /dev/null
+#include "alsa_pool.h"
+
+#include <alsa/control.h>
+#include <alsa/error.h>
+#include <alsa/pcm.h>
+#include <assert.h>
+#include <limits.h>
+#include <stdio.h>
+#include <sys/inotify.h>
+#include <unistd.h>
+#include <algorithm>
+#include <memory>
+
+#include "alsa_input.h"
+#include "audio_mixer.h"
+#include "defs.h"
+#include "input_mapping.h"
+#include "state.pb.h"
+
+using namespace std;
+using namespace std::placeholders;
+
+ALSAPool::~ALSAPool()
+{
+ for (Device &device : devices) {
+ if (device.input != nullptr) {
+ device.input->stop_capture_thread();
+ }
+ }
+}
+
+std::vector<ALSAPool::Device> ALSAPool::get_devices()
+{
+ lock_guard<mutex> lock(mu);
+ for (Device &device : devices) {
+ device.held = true;
+ }
+ return devices;
+}
+
+void ALSAPool::hold_device(unsigned index)
+{
+ lock_guard<mutex> lock(mu);
+ assert(index < devices.size());
+ devices[index].held = true;
+}
+
+void ALSAPool::release_device(unsigned index)
+{
+ lock_guard<mutex> lock(mu);
+ if (index < devices.size()) {
+ devices[index].held = false;
+ }
+}
+
+void ALSAPool::enumerate_devices()
+{
+ // Enumerate all cards.
+ for (int card_index = -1; snd_card_next(&card_index) == 0 && card_index >= 0; ) {
+ char address[256];
+ snprintf(address, sizeof(address), "hw:%d", card_index);
+
+ snd_ctl_t *ctl;
+ int err = snd_ctl_open(&ctl, address, 0);
+ if (err < 0) {
+ printf("%s: %s\n", address, snd_strerror(err));
+ continue;
+ }
+ unique_ptr<snd_ctl_t, decltype(snd_ctl_close)*> ctl_closer(ctl, snd_ctl_close);
+
+ // Enumerate all devices on this card.
+ for (int dev_index = -1; snd_ctl_pcm_next_device(ctl, &dev_index) == 0 && dev_index >= 0; ) {
+ probe_device_with_retry(card_index, dev_index);
+ }
+ }
+}
+
+void ALSAPool::probe_device_with_retry(unsigned card_index, unsigned dev_index)
+{
+ char address[256];
+ snprintf(address, sizeof(address), "hw:%d,%d", card_index, dev_index);
+
+ lock_guard<mutex> lock(add_device_mutex);
+ if (add_device_tries_left.count(address)) {
+ // Some thread is already busy retrying this,
+ // so just reset its count.
+ add_device_tries_left[address] = num_retries;
+ return;
+ }
+
+ // Try (while still holding the lock) to add the device synchronously.
+ ProbeResult result = probe_device_once(card_index, dev_index);
+ if (result == ProbeResult::SUCCESS) {
+ return;
+ } else if (result == ProbeResult::FAILURE) {
+ return;
+ }
+ assert(result == ProbeResult::DEFER);
+
+ // Add failed for whatever reason (probably just that the device
+ // isn't up yet. Set up a count so that nobody else starts a thread,
+ // then start it ourselves.
+ fprintf(stderr, "Trying %s again in one second...\n", address);
+ add_device_tries_left[address] = num_retries;
+ thread(&ALSAPool::probe_device_retry_thread_func, this, card_index, dev_index).detach();
+}
+
+void ALSAPool::probe_device_retry_thread_func(unsigned card_index, unsigned dev_index)
+{
+ char address[256];
+ snprintf(address, sizeof(address), "hw:%d,%d", card_index, dev_index);
+
+ for ( ;; ) { // Termination condition within the loop.
+ sleep(1);
+
+ // See if there are any retries left.
+ lock_guard<mutex> lock(add_device_mutex);
+ if (!add_device_tries_left.count(address) ||
+ add_device_tries_left[address] == 0) {
+ add_device_tries_left.erase(address);
+ fprintf(stderr, "Giving up probe of %s.\n", address);
+ return;
+ }
+
+ // Seemingly there were. Give it a try (we still hold the mutex).
+ ProbeResult result = probe_device_once(card_index, dev_index);
+ if (result == ProbeResult::SUCCESS) {
+ add_device_tries_left.erase(address);
+ fprintf(stderr, "Probe of %s succeeded.\n", address);
+ return;
+ } else if (result == ProbeResult::FAILURE || --add_device_tries_left[address] == 0) {
+ add_device_tries_left.erase(address);
+ fprintf(stderr, "Giving up probe of %s.\n", address);
+ return;
+ }
+
+ // Failed again.
+ assert(result == ProbeResult::DEFER);
+ fprintf(stderr, "Trying %s again in one second (%d tries left)...\n",
+ address, add_device_tries_left[address]);
+ }
+}
+
+ALSAPool::ProbeResult ALSAPool::probe_device_once(unsigned card_index, unsigned dev_index)
+{
+ char address[256];
+ snprintf(address, sizeof(address), "hw:%d", card_index);
+ snd_ctl_t *ctl;
+ int err = snd_ctl_open(&ctl, address, 0);
+ if (err < 0) {
+ printf("%s: %s\n", address, snd_strerror(err));
+ return ALSAPool::ProbeResult::DEFER;
+ }
+ unique_ptr<snd_ctl_t, decltype(snd_ctl_close)*> ctl_closer(ctl, snd_ctl_close);
+
+ snd_pcm_info_t *pcm_info;
+ snd_pcm_info_alloca(&pcm_info);
+ snd_pcm_info_set_device(pcm_info, dev_index);
+ snd_pcm_info_set_subdevice(pcm_info, 0);
+ snd_pcm_info_set_stream(pcm_info, SND_PCM_STREAM_CAPTURE);
+ if (snd_ctl_pcm_info(ctl, pcm_info) < 0) {
+ // Not available for capture.
+ printf("%s: Not available for capture.\n", address);
+ return ALSAPool::ProbeResult::DEFER;
+ }
+
+ snprintf(address, sizeof(address), "hw:%d,%d", card_index, dev_index);
+
+ unsigned num_channels = 0;
+
+ // Find all channel maps for this device, and pick out the one
+ // with the most channels.
+ snd_pcm_chmap_query_t **cmaps = snd_pcm_query_chmaps_from_hw(card_index, dev_index, 0, SND_PCM_STREAM_CAPTURE);
+ if (cmaps != nullptr) {
+ for (snd_pcm_chmap_query_t **ptr = cmaps; *ptr; ++ptr) {
+ num_channels = max(num_channels, (*ptr)->map.channels);
+ }
+ snd_pcm_free_chmaps(cmaps);
+ }
+ if (num_channels == 0) {
+ // Device had no channel maps. We need to open it to query.
+ // TODO: Do this asynchronously.
+ snd_pcm_t *pcm_handle;
+ int err = snd_pcm_open(&pcm_handle, address, SND_PCM_STREAM_CAPTURE, 0);
+ if (err < 0) {
+ printf("%s: %s\n", address, snd_strerror(err));
+ return ALSAPool::ProbeResult::DEFER;
+ }
+ snd_pcm_hw_params_t *hw_params;
+ snd_pcm_hw_params_alloca(&hw_params);
+ unsigned sample_rate;
+ if (!ALSAInput::set_base_params(address, pcm_handle, hw_params, &sample_rate)) {
+ snd_pcm_close(pcm_handle);
+ return ALSAPool::ProbeResult::DEFER;
+ }
+ err = snd_pcm_hw_params_get_channels_max(hw_params, &num_channels);
+ if (err < 0) {
+ fprintf(stderr, "[%s] snd_pcm_hw_params_get_channels_max(): %s\n",
+ address, snd_strerror(err));
+ snd_pcm_close(pcm_handle);
+ return ALSAPool::ProbeResult::DEFER;
+ }
+ snd_pcm_close(pcm_handle);
+ }
+
+ if (num_channels == 0) {
+ printf("%s: No channel maps with channels\n", address);
+ return ALSAPool::ProbeResult::FAILURE;
+ }
+
+ snd_ctl_card_info_t *card_info;
+ snd_ctl_card_info_alloca(&card_info);
+ snd_ctl_card_info(ctl, card_info);
+
+ string name = snd_ctl_card_info_get_name(card_info);
+ string info = snd_pcm_info_get_name(pcm_info);
+
+ unsigned internal_dev_index;
+ string display_name;
+ {
+ lock_guard<mutex> lock(mu);
+ internal_dev_index = find_free_device_index(name, info, num_channels, address);
+ devices[internal_dev_index].address = address;
+ devices[internal_dev_index].name = name;
+ devices[internal_dev_index].info = info;
+ devices[internal_dev_index].num_channels = num_channels;
+ // Note: Purposefully does not overwrite held.
+
+ display_name = devices[internal_dev_index].display_name();
+ }
+
+ fprintf(stderr, "%s: Probed successfully.\n", address);
+
+ reset_device(internal_dev_index); // Restarts it if it is held (ie., we just replaced a dead card).
+
+ DeviceSpec spec{InputSourceType::ALSA_INPUT, internal_dev_index};
+ global_audio_mixer->set_display_name(spec, display_name);
+ global_audio_mixer->trigger_state_changed_callback();
+
+ return ALSAPool::ProbeResult::SUCCESS;
+}
+
+void ALSAPool::unplug_device(unsigned card_index, unsigned dev_index)
+{
+ char address[256];
+ snprintf(address, sizeof(address), "hw:%d,%d", card_index, dev_index);
+ for (unsigned i = 0; i < devices.size(); ++i) {
+ if (devices[i].state != Device::State::EMPTY &&
+ devices[i].state != Device::State::DEAD &&
+ devices[i].address == address) {
+ free_card(i);
+ }
+ }
+}
+
+void ALSAPool::init()
+{
+ thread(&ALSAPool::inotify_thread_func, this).detach();
+ enumerate_devices();
+}
+
+void ALSAPool::inotify_thread_func()
+{
+ int inotify_fd = inotify_init();
+ if (inotify_fd == -1) {
+ perror("inotify_init()");
+ fprintf(stderr, "No hotplug of ALSA devices available.\n");
+ return;
+ }
+
+ int watch_fd = inotify_add_watch(inotify_fd, "/dev/snd", IN_MOVE | IN_CREATE | IN_DELETE);
+ if (watch_fd == -1) {
+ perror("inotify_add_watch()");
+ fprintf(stderr, "No hotplug of ALSA devices available.\n");
+ close(inotify_fd);
+ return;
+ }
+
+ int size = sizeof(inotify_event) + NAME_MAX + 1;
+ unique_ptr<char[]> buf(new char[size]);
+ for ( ;; ) {
+ int ret = read(inotify_fd, buf.get(), size);
+ if (ret < int(sizeof(inotify_event))) {
+ fprintf(stderr, "inotify read unexpectedly returned %d, giving up hotplug of ALSA devices.\n",
+ int(ret));
+ close(watch_fd);
+ close(inotify_fd);
+ return;
+ }
+
+ for (int i = 0; i < ret; ) {
+ const inotify_event *event = reinterpret_cast<const inotify_event *>(&buf[i]);
+ i += sizeof(inotify_event) + event->len;
+
+ if (event->mask & IN_Q_OVERFLOW) {
+ fprintf(stderr, "WARNING: inotify overflowed, may lose ALSA hotplug events.\n");
+ continue;
+ }
+ unsigned card, device;
+ char type;
+ if (sscanf(event->name, "pcmC%uD%u%c", &card, &device, &type) == 3 && type == 'c') {
+ if (event->mask & (IN_MOVED_FROM | IN_DELETE)) {
+ printf("Deleted capture device: Card %u, device %u\n", card, device);
+ unplug_device(card, device);
+ }
+ if (event->mask & (IN_MOVED_TO | IN_CREATE)) {
+ printf("Adding capture device: Card %u, device %u\n", card, device);
+ probe_device_with_retry(card, device);
+ }
+ }
+ }
+ }
+}
+
+void ALSAPool::reset_device(unsigned index)
+{
+ lock_guard<mutex> lock(mu);
+ Device *device = &devices[index];
+ if (inputs[index] != nullptr) {
+ inputs[index]->stop_capture_thread();
+ }
+ if (!device->held) {
+ inputs[index].reset();
+ } else {
+ // TODO: Put on a background thread instead of locking?
+ auto callback = bind(&AudioMixer::add_audio, global_audio_mixer, DeviceSpec{InputSourceType::ALSA_INPUT, index}, _1, _2, _3, _4);
+ inputs[index].reset(new ALSAInput(device->address.c_str(), OUTPUT_FREQUENCY, device->num_channels, callback, this, index));
+ inputs[index]->start_capture_thread();
+ }
+ device->input = inputs[index].get();
+}
+
+unsigned ALSAPool::get_capture_frequency(unsigned index)
+{
+ lock_guard<mutex> lock(mu);
+ assert(devices[index].held);
+ if (devices[index].input)
+ return devices[index].input->get_sample_rate();
+ else
+ return OUTPUT_FREQUENCY;
+}
+
+ALSAPool::Device::State ALSAPool::get_card_state(unsigned index)
+{
+ lock_guard<mutex> lock(mu);
+ assert(devices[index].held);
+ return devices[index].state;
+}
+
+void ALSAPool::set_card_state(unsigned index, ALSAPool::Device::State state)
+{
+ {
+ lock_guard<mutex> lock(mu);
+ devices[index].state = state;
+ }
+
+ DeviceSpec spec{InputSourceType::ALSA_INPUT, index};
+ bool silence = (state != ALSAPool::Device::State::RUNNING);
+ while (!global_audio_mixer->silence_card(spec, silence))
+ ;
+ global_audio_mixer->trigger_state_changed_callback();
+}
+
+unsigned ALSAPool::find_free_device_index(const string &name, const string &info, unsigned num_channels, const string &address)
+{
+ // First try to find an exact match on a dead card.
+ for (unsigned i = 0; i < devices.size(); ++i) {
+ if (devices[i].state == Device::State::DEAD &&
+ devices[i].address == address &&
+ devices[i].name == name &&
+ devices[i].info == info &&
+ devices[i].num_channels == num_channels) {
+ devices[i].state = Device::State::READY;
+ return i;
+ }
+ }
+
+ // Then try to find a match on everything but the address
+ // (probably that devices were plugged back in a different order).
+ // If we have two cards that are equal, this might get them mixed up,
+ // but we don't have anything better.
+ for (unsigned i = 0; i < devices.size(); ++i) {
+ if (devices[i].state == Device::State::DEAD &&
+ devices[i].name == name &&
+ devices[i].info == info &&
+ devices[i].num_channels == num_channels) {
+ devices[i].state = Device::State::READY;
+ return i;
+ }
+ }
+
+ // OK, so we didn't find a match; see if there are any empty slots.
+ for (unsigned i = 0; i < devices.size(); ++i) {
+ if (devices[i].state == Device::State::EMPTY) {
+ devices[i].state = Device::State::READY;
+ devices[i].held = false;
+ return i;
+ }
+ }
+
+ // Failing that, we just insert the new device at the end.
+ Device new_dev;
+ new_dev.state = Device::State::READY;
+ new_dev.held = false;
+ devices.push_back(new_dev);
+ inputs.emplace_back(nullptr);
+ return devices.size() - 1;
+}
+
+unsigned ALSAPool::create_dead_card(const string &name, const string &info, unsigned num_channels)
+{
+ lock_guard<mutex> lock(mu);
+
+ // See if there are any empty slots. If not, insert one at the end.
+ vector<Device>::iterator free_device =
+ find_if(devices.begin(), devices.end(),
+ [](const Device &device) { return device.state == Device::State::EMPTY; });
+ if (free_device == devices.end()) {
+ devices.push_back(Device());
+ inputs.emplace_back(nullptr);
+ free_device = devices.end() - 1;
+ }
+
+ free_device->state = Device::State::DEAD;
+ free_device->name = name;
+ free_device->info = info;
+ free_device->num_channels = num_channels;
+ free_device->held = true;
+
+ return distance(devices.begin(), free_device);
+}
+
+void ALSAPool::serialize_device(unsigned index, DeviceSpecProto *serialized)
+{
+ lock_guard<mutex> lock(mu);
+ assert(index < devices.size());
+ assert(devices[index].held);
+ serialized->set_type(DeviceSpecProto::ALSA_INPUT);
+ serialized->set_index(index);
+ serialized->set_display_name(devices[index].display_name());
+ serialized->set_alsa_name(devices[index].name);
+ serialized->set_alsa_info(devices[index].info);
+ serialized->set_num_channels(devices[index].num_channels);
+ serialized->set_address(devices[index].address);
+}
+
+void ALSAPool::free_card(unsigned index)
+{
+ DeviceSpec spec{InputSourceType::ALSA_INPUT, index};
+ while (!global_audio_mixer->silence_card(spec, true))
+ ;
+
+ {
+ lock_guard<mutex> lock(mu);
+ if (devices[index].held) {
+ devices[index].state = Device::State::DEAD;
+ } else {
+ devices[index].state = Device::State::EMPTY;
+ inputs[index].reset();
+ }
+ while (!devices.empty() && devices.back().state == Device::State::EMPTY) {
+ devices.pop_back();
+ inputs.pop_back();
+ }
+ }
+
+ global_audio_mixer->trigger_state_changed_callback();
+}
--- /dev/null
+#ifndef _ALSA_POOL_H
+#define _ALSA_POOL_H 1
+
+#include <alsa/asoundlib.h>
+#include <atomic>
+#include <functional>
+#include <mutex>
+#include <string>
+#include <thread>
+#include <unordered_map>
+#include <vector>
+
+#include "alsa_input.h"
+#include "bmusb/bmusb.h"
+#include "timebase.h"
+
+class ALSAInput;
+class DeviceSpecProto;
+
+// The class dealing with the collective of all ALSA cards in the system.
+// In particular, it deals with enumeration of cards, and hotplug of new ones.
+class ALSAPool {
+public:
+ ~ALSAPool();
+
+ struct Device {
+ enum class State {
+ // There is no card here. (There probably used to be one,
+ // but it got removed.) We don't insert a card before
+ // we've actually probed it, ie., we know whether it
+ // can be captured from at all, and what its name is.
+ EMPTY,
+
+ // This card is ready for capture, as far as we know.
+ // (It could still be used by someone else; we don't know
+ // until we try to open it.)
+ READY,
+
+ // We are trying to start capture from this card, but we are not
+ // streaming yet. Note that this could in theory go on forever,
+ // if the card is in use by some other process; in the UI,
+ // we will show this state as “(busy)”.
+ STARTING,
+
+ // The card is capturing and sending data. If there's a fatal error,
+ // it could go back to STARTING, or it could go to DEAD
+ // (depending on the error).
+ RUNNING,
+
+ // The card is gone (e.g., unplugged). However, since there's
+ // still a bus using it, we can't just remove the entry.
+ // If the card comes back (ie., a new card is plugged in,
+ // and we believe it has the same configuration), it could be
+ // installed in place of this card, and then presumably be put
+ // back into STARTING or RUNNING.
+ DEAD
+ } state = State::EMPTY;
+
+ std::string address; // E.g. “hw:0,0”.
+ std::string name, info;
+ unsigned num_channels;
+ ALSAInput *input = nullptr; // nullptr iff EMPTY or DEAD.
+
+ // Whether the AudioMixer is interested in this card or not.
+ // “Interested” could mean either of two things: Either it is part of
+ // a bus mapping, or it is in the process of enumerating devices
+ // (to show to the user). A card that is _not_ held can disappear
+ // at any given time as a result of an error or hotplug event;
+ // a card that is held will go to the DEAD state instead.
+ bool held = false;
+
+ std::string display_name() const { return name + " (" + info + ")"; }
+ };
+
+ void init();
+
+ // Get the list of all current devices. Note that this will implicitly mark
+ // all of the returned devices as held, since the input mapping UI needs
+ // some kind of stability when the user is to choose. Thus, when you are done
+ // with the list and have set a new mapping, you must go through all the devices
+ // you don't want and release them using release_device().
+ std::vector<Device> get_devices();
+
+ void hold_device(unsigned index);
+ void release_device(unsigned index); // Note: index is allowed to go out of bounds.
+
+ // If device is held, start or restart capture. If device is not held,
+ // stop capture if it isn't already.
+ void reset_device(unsigned index);
+
+ // Note: The card must be held. Returns OUTPUT_FREQUENCY if the card is in EMPTY or DEAD.
+ unsigned get_capture_frequency(unsigned index);
+
+ // Note: The card must be held.
+ Device::State get_card_state(unsigned index);
+
+ // Only for ALSAInput.
+ void set_card_state(unsigned index, Device::State state);
+
+ // Just a short form for taking <mu> and then moving the card to
+ // EMPTY or DEAD state. Only for ALSAInput and for internal use.
+ void free_card(unsigned index);
+
+ // Create a new card, mark it immediately as DEAD and hold it.
+ // Returns the new index.
+ unsigned create_dead_card(const std::string &name, const std::string &info, unsigned num_channels);
+
+ // Make a protobuf representation of the given card, so that it can be
+ // matched against at a later stage. For AudioMixer only.
+ // The given card must be held.
+ void serialize_device(unsigned index, DeviceSpecProto *serialized);
+
+private:
+ mutable std::mutex mu;
+ std::vector<Device> devices; // Under mu.
+ std::vector<std::unique_ptr<ALSAInput>> inputs; // Under mu, corresponds 1:1 to devices.
+
+ // Keyed on device address (e.g. “hw:0,0”). If there's an entry here,
+ // it means we already have a thread doing retries, so we shouldn't
+ // start a new one.
+ std::unordered_map<std::string, unsigned> add_device_tries_left; // Under add_device_mutex.
+ std::mutex add_device_mutex;
+
+ static constexpr int num_retries = 10;
+
+ void inotify_thread_func();
+ void enumerate_devices();
+
+ // Try to add an input at the given card/device. If it succeeds, return
+ // synchronously. If not, fire off a background thread to try up to
+ // <num_retries> times.
+ void probe_device_with_retry(unsigned card_index, unsigned dev_index);
+ void probe_device_retry_thread_func(unsigned card_index, unsigned dev_index);
+
+ enum class ProbeResult {
+ SUCCESS,
+ DEFER,
+ FAILURE
+ };
+ ProbeResult probe_device_once(unsigned card_index, unsigned dev_index);
+
+ void unplug_device(unsigned card_index, unsigned dev_index);
+
+ // Must be called with <mu> held. Will allocate a new entry if needed.
+ // The returned entry will be set to READY state.
+ unsigned find_free_device_index(const std::string &name,
+ const std::string &info,
+ unsigned num_channels,
+ const std::string &address);
+
+ friend class ALSAInput;
+};
+
+#endif // !defined(_ALSA_POOL_H)
#include <zita-resampler/resampler.h>
#include "alsa_input.h"
+#include "alsa_pool.h"
#include "bmusb/bmusb.h"
#include "correlation_measurer.h"
#include "db.h"
projects / nageru / commitdiff