-
#include "alsa_input.h"
+#include "audio_mixer.h"
+#include "defs.h"
+#include "state.pb.h"
+
+#include <sys/inotify.h>
+
+#include <algorithm>
+#include <functional>
+#include <unordered_map>
using namespace std;
+using namespace std::placeholders;
-ALSAInput::ALSAInput(const char *device, unsigned sample_rate, unsigned num_channels, audio_callback_t audio_callback)
- : device(device), sample_rate(sample_rate), num_channels(num_channels), audio_callback(audio_callback)
-{
- die_on_error(device, snd_pcm_open(&pcm_handle,device, SND_PCM_STREAM_CAPTURE, 0));
+namespace {
- // Set format.
- snd_pcm_hw_params_t *hw_params;
- snd_pcm_hw_params_alloca(&hw_params);
- die_on_error("snd_pcm_hw_params_any()", snd_pcm_hw_params_any(pcm_handle, hw_params));
- die_on_error("snd_pcm_hw_params_set_access()", snd_pcm_hw_params_set_access(pcm_handle, hw_params, SND_PCM_ACCESS_RW_INTERLEAVED));
+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);
- die_on_error("snd_pcm_hw_params_set_format()", snd_pcm_hw_params_set_format_mask(pcm_handle, hw_params, format_mask));
- die_on_error("snd_pcm_hw_params_set_rate_near()", snd_pcm_hw_params_set_rate_near(pcm_handle, hw_params, &sample_rate, 0));
- die_on_error("snd_pcm_hw_params_set_channels()", snd_pcm_hw_params_set_channels(pcm_handle, hw_params, num_channels));
+ 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;
+}
- die_on_error("snd_pcm_hw_params_set_channels()", snd_pcm_hw_params_set_channels(pcm_handle, hw_params, num_channels));
+} // namespace
+
+#define RETURN_ON_ERROR(msg, expr) do { \
+ int err = (expr); \
+ if (err < 0) { \
+ fprintf(stderr, "[%s] " msg ": %s\n", device.c_str(), snd_strerror(err)); \
+ if (err == -ENODEV) return CaptureEndReason::DEVICE_GONE; \
+ return CaptureEndReason::OTHER_ERROR; \
+ } \
+} while (false)
+
+#define RETURN_FALSE_ON_ERROR(msg, expr) do { \
+ int err = (expr); \
+ if (err < 0) { \
+ fprintf(stderr, "[%s] " msg ": %s\n", device.c_str(), snd_strerror(err)); \
+ return false; \
+ } \
+} while (false)
+
+#define WARN_ON_ERROR(msg, expr) do { \
+ int err = (expr); \
+ if (err < 0) { \
+ fprintf(stderr, "[%s] " msg ": %s\n", device.c_str(), snd_strerror(err)); \
+ } \
+} while (false)
+
+ALSAInput::ALSAInput(const char *device, unsigned sample_rate, unsigned num_channels, audio_callback_t audio_callback, ALSAPool *parent_pool, unsigned internal_dev_index)
+ : device(device),
+ sample_rate(sample_rate),
+ num_channels(num_channels),
+ audio_callback(audio_callback),
+ parent_pool(parent_pool),
+ internal_dev_index(internal_dev_index)
+{
+}
+
+bool ALSAInput::open_device()
+{
+ RETURN_FALSE_ON_ERROR("snd_pcm_open()", snd_pcm_open(&pcm_handle, device.c_str(), SND_PCM_STREAM_CAPTURE, 0));
+
+ // Set format.
+ snd_pcm_hw_params_t *hw_params;
+ snd_pcm_hw_params_alloca(&hw_params);
+ if (!set_base_params(device.c_str(), pcm_handle, hw_params, &sample_rate)) {
+ return false;
+ }
+
+ RETURN_FALSE_ON_ERROR("snd_pcm_hw_params_set_channels()", snd_pcm_hw_params_set_channels(pcm_handle, hw_params, num_channels));
// Fragment size of 64 samples (about 1 ms at 48 kHz; a frame at 60
// fps/48 kHz is 800 samples.) We ask for 64 such periods in our buffer
// I can't have a big buffer.
num_periods = 16;
int dir = 0;
- die_on_error("snd_pcm_hw_params_set_periods_near()", snd_pcm_hw_params_set_periods_near(pcm_handle, hw_params, &num_periods, &dir));
+ RETURN_FALSE_ON_ERROR("snd_pcm_hw_params_set_periods_near()", snd_pcm_hw_params_set_periods_near(pcm_handle, hw_params, &num_periods, &dir));
period_size = 64;
dir = 0;
- die_on_error("snd_pcm_hw_params_set_period_size_near()", snd_pcm_hw_params_set_period_size_near(pcm_handle, hw_params, &period_size, &dir));
+ RETURN_FALSE_ON_ERROR("snd_pcm_hw_params_set_period_size_near()", snd_pcm_hw_params_set_period_size_near(pcm_handle, hw_params, &period_size, &dir));
buffer_frames = 64 * 64;
- die_on_error("snd_pcm_hw_params_set_buffer_size_near()", snd_pcm_hw_params_set_buffer_size_near(pcm_handle, hw_params, &buffer_frames));
- die_on_error("snd_pcm_hw_params()", snd_pcm_hw_params(pcm_handle, hw_params));
+ RETURN_FALSE_ON_ERROR("snd_pcm_hw_params_set_buffer_size_near()", snd_pcm_hw_params_set_buffer_size_near(pcm_handle, hw_params, &buffer_frames));
+ RETURN_FALSE_ON_ERROR("snd_pcm_hw_params()", snd_pcm_hw_params(pcm_handle, hw_params));
//snd_pcm_hw_params_free(hw_params);
// Figure out which format the card actually chose.
- die_on_error("snd_pcm_hw_params_current()", snd_pcm_hw_params_current(pcm_handle, hw_params));
+ RETURN_FALSE_ON_ERROR("snd_pcm_hw_params_current()", snd_pcm_hw_params_current(pcm_handle, hw_params));
snd_pcm_format_t chosen_format;
- die_on_error("snd_pcm_hw_params_get_format()", snd_pcm_hw_params_get_format(hw_params, &chosen_format));
+ RETURN_FALSE_ON_ERROR("snd_pcm_hw_params_get_format()", snd_pcm_hw_params_get_format(hw_params, &chosen_format));
audio_format.num_channels = num_channels;
audio_format.bits_per_sample = 0;
snd_pcm_sw_params_t *sw_params;
snd_pcm_sw_params_alloca(&sw_params);
- die_on_error("snd_pcm_sw_params_current()", snd_pcm_sw_params_current(pcm_handle, sw_params));
- die_on_error("snd_pcm_sw_params_set_start_threshold", snd_pcm_sw_params_set_start_threshold(pcm_handle, sw_params, num_periods * period_size / 2));
- die_on_error("snd_pcm_sw_params()", snd_pcm_sw_params(pcm_handle, sw_params));
+ RETURN_FALSE_ON_ERROR("snd_pcm_sw_params_current()", snd_pcm_sw_params_current(pcm_handle, sw_params));
+ RETURN_FALSE_ON_ERROR("snd_pcm_sw_params_set_start_threshold", snd_pcm_sw_params_set_start_threshold(pcm_handle, sw_params, num_periods * period_size / 2));
+ RETURN_FALSE_ON_ERROR("snd_pcm_sw_params()", snd_pcm_sw_params(pcm_handle, sw_params));
- die_on_error("snd_pcm_nonblock()", snd_pcm_nonblock(pcm_handle, 1));
- die_on_error("snd_pcm_prepare()", snd_pcm_prepare(pcm_handle));
+ RETURN_FALSE_ON_ERROR("snd_pcm_nonblock()", snd_pcm_nonblock(pcm_handle, 1));
+ RETURN_FALSE_ON_ERROR("snd_pcm_prepare()", snd_pcm_prepare(pcm_handle));
+ return true;
}
ALSAInput::~ALSAInput()
{
- die_on_error("snd_pcm_close()", snd_pcm_close(pcm_handle));
+ if (pcm_handle) {
+ WARN_ON_ERROR("snd_pcm_close()", snd_pcm_close(pcm_handle));
+ }
}
void ALSAInput::start_capture_thread()
void ALSAInput::capture_thread_func()
{
- die_on_error("snd_pcm_start()", snd_pcm_start(pcm_handle));
+ parent_pool->set_card_state(internal_dev_index, ALSAPool::Device::State::STARTING);
+
+ // If the device hasn't been opened already, we need to do so
+ // before we can capture.
+ while (!should_quit && pcm_handle == nullptr) {
+ if (!open_device()) {
+ fprintf(stderr, "[%s] Waiting one second and trying again...\n",
+ device.c_str());
+ sleep(1);
+ }
+ }
+
+ if (should_quit) {
+ // Don't call free_card(); that would be a deadlock.
+ WARN_ON_ERROR("snd_pcm_close()", snd_pcm_close(pcm_handle));
+ pcm_handle = nullptr;
+ return;
+ }
+
+ // Do the actual capture. (Termination condition within loop.)
+ for ( ;; ) {
+ switch (do_capture()) {
+ case CaptureEndReason::REQUESTED_QUIT:
+ // Don't call free_card(); that would be a deadlock.
+ WARN_ON_ERROR("snd_pcm_close()", snd_pcm_close(pcm_handle));
+ pcm_handle = nullptr;
+ return;
+ case CaptureEndReason::DEVICE_GONE:
+ parent_pool->free_card(internal_dev_index);
+ WARN_ON_ERROR("snd_pcm_close()", snd_pcm_close(pcm_handle));
+ pcm_handle = nullptr;
+ return;
+ case CaptureEndReason::OTHER_ERROR:
+ 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);
+ break;
+ }
+ }
+}
+
+ALSAInput::CaptureEndReason ALSAInput::do_capture()
+{
+ parent_pool->set_card_state(internal_dev_index, ALSAPool::Device::State::STARTING);
+ RETURN_ON_ERROR("snd_pcm_start()", snd_pcm_start(pcm_handle));
+ parent_pool->set_card_state(internal_dev_index, ALSAPool::Device::State::RUNNING);
+
uint64_t num_frames_output = 0;
while (!should_quit) {
int ret = snd_pcm_wait(pcm_handle, /*timeout=*/100);
snd_pcm_start(pcm_handle);
continue;
}
- die_on_error("snd_pcm_wait()", ret);
+ RETURN_ON_ERROR("snd_pcm_wait()", ret);
snd_pcm_sframes_t frames = snd_pcm_readi(pcm_handle, buffer.get(), buffer_frames);
if (frames == -EPIPE) {
fprintf(stderr, "snd_pcm_readi() returned 0\n");
break;
}
- die_on_error("snd_pcm_readi()", frames);
+ RETURN_ON_ERROR("snd_pcm_readi()", frames);
const int64_t prev_pts = frames_to_pts(num_frames_output);
const int64_t pts = frames_to_pts(num_frames_output + frames);
- audio_callback(buffer.get(), frames, audio_format, pts - prev_pts);
+ bool success;
+ do {
+ if (should_quit) return CaptureEndReason::REQUESTED_QUIT;
+ success = audio_callback(buffer.get(), frames, audio_format, pts - prev_pts);
+ } while (!success);
num_frames_output += frames;
}
+ return CaptureEndReason::REQUESTED_QUIT;
}
int64_t ALSAInput::frames_to_pts(uint64_t n) const
return (n * TIMEBASE) / sample_rate;
}
-void ALSAInput::die_on_error(const char *func_name, int err)
+ALSAPool::~ALSAPool()
{
- if (err < 0) {
- fprintf(stderr, "[%s] %s: %s\n", device.c_str(), func_name, snd_strerror(err));
- exit(1);
+ for (Device &device : devices) {
+ if (device.input != nullptr) {
+ device.input->stop_capture_thread();
+ }
}
}
-vector<ALSAInput::Device> ALSAInput::enumerate_devices()
+std::vector<ALSAPool::Device> ALSAPool::get_devices()
{
- vector<Device> ret;
+ 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];
printf("%s: %s\n", address, snd_strerror(err));
continue;
}
- snd_ctl_card_info_t *card_info;
- snd_ctl_card_info_alloca(&card_info);
- snd_ctl_card_info(ctl, card_info);
-
- string card_name = snd_ctl_card_info_get_name(card_info);
+ 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; ) {
- 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.
- continue;
- }
+ 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);
- 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;
+ }
- // 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);
- unsigned num_channels = 0;
- for (snd_pcm_chmap_query_t **ptr = cmaps; *ptr; ++ptr) {
- num_channels = max(num_channels, (*ptr)->map.channels);
- }
+ // 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;
+ }
- snd_pcm_free_chmaps(cmaps);
+ // 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;
+ }
- if (num_channels == 0) {
- printf("%s: No channel maps with channels\n", address);
+ 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;
+ }
+ }
- Device dev;
- dev.address = address;
- dev.name = card_name;
- dev.info = snd_pcm_info_get_name(pcm_info);
- dev.num_channels = num_channels;
+ // 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;
+ }
+ }
- ret.push_back(dev);
+ // 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();
}
- snd_ctl_close(ctl);
}
- return ret;
+ global_audio_mixer->trigger_state_changed_callback();
}
projects / nageru / blobdiff