#include "alsa_input.h"
-#include "audio_mixer.h"
-#include "defs.h"
-#include <sys/inotify.h>
+#include <alsa/error.h>
+#include <assert.h>
+#include <errno.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <cstdint>
-#include <functional>
-#include <unordered_map>
+#include "alsa_pool.h"
+#include "bmusb/bmusb.h"
+#include "timebase.h"
using namespace std;
+using namespace std::chrono;
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) { \
default:
assert(false);
}
+ audio_format.sample_rate = sample_rate;
//printf("num_periods=%u period_size=%u buffer_frames=%u sample_rate=%u bits_per_sample=%d\n",
// num_periods, unsigned(period_size), unsigned(buffer_frames), sample_rate, audio_format.bits_per_sample);
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) {
void ALSAInput::start_capture_thread()
{
- should_quit = false;
+ assert(!device.empty());
+ should_quit.unquit();
capture_thread = thread(&ALSAInput::capture_thread_func, this);
}
void ALSAInput::stop_capture_thread()
{
- should_quit = true;
+ should_quit.quit();
capture_thread.join();
}
// If the device hasn't been opened already, we need to do so
// before we can capture.
- while (!should_quit && pcm_handle == nullptr) {
+ while (!should_quit.should_quit() && pcm_handle == nullptr) {
if (!open_device()) {
fprintf(stderr, "[%s] Waiting one second and trying again...\n",
device.c_str());
- sleep(1);
+ should_quit.sleep_for(seconds(1));
}
}
- if (should_quit) {
+ if (should_quit.should_quit()) {
// Don't call free_card(); that would be a deadlock.
- WARN_ON_ERROR("snd_pcm_close()", snd_pcm_close(pcm_handle));
+ if (pcm_handle) {
+ WARN_ON_ERROR("snd_pcm_close()", snd_pcm_close(pcm_handle));
+ }
pcm_handle = nullptr;
return;
}
parent_pool->set_card_state(internal_dev_index, ALSAPool::Device::State::STARTING);
fprintf(stderr, "[%s] Sleeping one second and restarting capture...\n",
device.c_str());
- sleep(1);
+ should_quit.sleep_for(seconds(1));
break;
}
}
parent_pool->set_card_state(internal_dev_index, ALSAPool::Device::State::RUNNING);
uint64_t num_frames_output = 0;
- while (!should_quit) {
+ while (!should_quit.should_quit()) {
int ret = snd_pcm_wait(pcm_handle, /*timeout=*/100);
if (ret == 0) continue; // Timeout.
if (ret == -EPIPE) {
const int64_t prev_pts = frames_to_pts(num_frames_output);
const int64_t pts = frames_to_pts(num_frames_output + frames);
+ const steady_clock::time_point now = steady_clock::now();
bool success;
do {
- if (should_quit) return CaptureEndReason::REQUESTED_QUIT;
- success = audio_callback(buffer.get(), frames, audio_format, pts - prev_pts);
+ if (should_quit.should_quit()) return CaptureEndReason::REQUESTED_QUIT;
+ success = audio_callback(buffer.get(), frames, audio_format, pts - prev_pts, now);
} while (!success);
num_frames_output += frames;
}
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;
- {
- 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.
- }
-
- 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).
-
- return ALSAPool::ProbeResult::SUCCESS;
-}
-
-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);
- // TODO: Unplug.
- }
- 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))
- ;
-}
-
-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;
-}
-
-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();
- }
-}
projects / nageru / blobdiff