+++ /dev/null
-#include "alsa_pool.h"
-
-#include <alsa/asoundlib.h>
-#include <assert.h>
-#include <errno.h>
-#include <limits.h>
-#include <pthread.h>
-#include <poll.h>
-#include <stdint.h>
-#include <stdio.h>
-#include <sys/eventfd.h>
-#include <sys/inotify.h>
-#include <unistd.h>
-#include <algorithm>
-#include <chrono>
-#include <functional>
-#include <iterator>
-#include <memory>
-#include <ratio>
-
-#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()
-{
- should_quit_fd = eventfd(/*initval=*/0, /*flags=*/0);
- assert(should_quit_fd != -1);
-}
-
-ALSAPool::~ALSAPool()
-{
- for (Device &device : devices) {
- if (device.input != nullptr) {
- device.input->stop_capture_thread();
- }
- }
- should_quit = true;
- const uint64_t one = 1;
- if (write(should_quit_fd, &one, sizeof(one)) != sizeof(one)) {
- perror("write(should_quit_fd)");
- exit(1);
- }
- inotify_thread.join();
-
- while (retry_threads_running > 0) {
- this_thread::sleep_for(std::chrono::milliseconds(100));
- }
-}
-
-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;
- ++retry_threads_running;
- 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);
-
- char thread_name[16];
- snprintf(thread_name, sizeof(thread_name), "Reprobe_hw:%d,%d", card_index, dev_index);
- pthread_setname_np(pthread_self(), thread_name);
-
- for ( ;; ) { // Termination condition within the loop.
- sleep(1);
-
- // See if there are any retries left.
- lock_guard<mutex> lock(add_device_mutex);
- if (should_quit ||
- !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);
- break;
- }
-
- // 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);
- break;
- } 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);
- break;
- }
-
- // Failed again.
- assert(result == ProbeResult::DEFER);
- fprintf(stderr, "Trying %s again in one second (%d tries left)...\n",
- address, add_device_tries_left[address]);
- }
-
- --retry_threads_running;
-}
-
-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);
-
- snprintf(address, sizeof(address), "hw:%d,%d", card_index, dev_index);
-
- 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);
- err = snd_ctl_pcm_info(ctl, pcm_info);
- if (err == -ENOENT) {
- // Not a capture card.
- return ALSAPool::ProbeResult::FAILURE;
- }
- if (err < 0) {
- // Not available for capture.
- printf("%s: Not available for capture.\n", address);
- return ALSAPool::ProbeResult::DEFER;
- }
-
- 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()
-{
- inotify_thread = thread(&ALSAPool::inotify_thread_func, this);
- enumerate_devices();
-}
-
-void ALSAPool::inotify_thread_func()
-{
- pthread_setname_np(pthread_self(), "ALSA_Hotplug");
-
- 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]);
- while (!should_quit) {
- pollfd fds[2];
- fds[0].fd = inotify_fd;
- fds[0].events = POLLIN;
- fds[0].revents = 0;
- fds[1].fd = should_quit_fd;
- fds[1].events = POLLIN;
- fds[1].revents = 0;
-
- int ret = poll(fds, 2, -1);
- if (ret == -1) {
- if (errno == EINTR) {
- continue;
- } else {
- perror("poll(inotify_fd)");
- return;
- }
- }
- if (ret == 0) {
- continue;
- }
-
- if (fds[1].revents) break; // should_quit_fd asserted.
-
- ret = read(inotify_fd, buf.get(), size);
- if (ret == -1) {
- if (errno == EINTR) {
- continue;
- } else {
- perror("read(inotify_fd)");
- close(watch_fd);
- close(inotify_fd);
- return;
- }
- }
- 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);
- }
- }
- }
- }
- close(watch_fd);
- close(inotify_fd);
- close(should_quit_fd);
-}
-
-void ALSAPool::reset_device(unsigned index)
-{
- lock_guard<mutex> lock(mu);
- Device *device = &devices[index];
- if (device->state == Device::State::DEAD) {
- // Not running, and should not be started.
- return;
- }
- 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, _5);
- 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();
-}
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