} // 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),
parent_pool(parent_pool),
internal_dev_index(internal_dev_index)
{
- die_on_error(device, snd_pcm_open(&pcm_handle, device, SND_PCM_STREAM_CAPTURE, 0));
+}
+
+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, pcm_handle, hw_params, &sample_rate)) {
- exit(1);
+ if (!set_base_params(device.c_str(), pcm_handle, hw_params, &sample_rate)) {
+ return false;
}
- die_on_error("snd_pcm_hw_params_set_channels()", snd_pcm_hw_params_set_channels(pcm_handle, hw_params, num_channels));
+ 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()
{
parent_pool->set_card_state(internal_dev_index, ALSAPool::Device::State::STARTING);
- die_on_error("snd_pcm_start()", snd_pcm_start(pcm_handle));
+
+ // 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;
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);
bool success;
do {
- if (should_quit) return;
+ if (should_quit) return CaptureEndReason::REQUESTED_QUIT;
success = audio_callback(buffer.get(), frames, audio_format, pts - prev_pts);
} while (!success);
num_frames_output += frames;
}
- parent_pool->free_card(internal_dev_index);
+ 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)
-{
- if (err < 0) {
- fprintf(stderr, "[%s] %s: %s\n", device.c_str(), func_name, snd_strerror(err));
- exit(1);
- }
-}
-
ALSAPool::~ALSAPool()
{
for (Device &device : devices) {
snd_ctl_card_info_alloca(&card_info);
snd_ctl_card_info(ctl, card_info);
- lock_guard<mutex> lock(mu);
- unsigned internal_dev_index = find_free_device_index();
- devices[internal_dev_index].address = address;
- devices[internal_dev_index].name = snd_ctl_card_info_get_name(card_info);
- devices[internal_dev_index].info = snd_pcm_info_get_name(pcm_info);
- devices[internal_dev_index].num_channels = num_channels;
- devices[internal_dev_index].state = Device::State::READY;
+ 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).
+ if (global_audio_mixer) {
+ 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();
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.
+ unplug_device(card, device);
}
if (event->mask & (IN_MOVED_TO | IN_CREATE)) {
printf("Adding capture device: Card %u, device %u\n", card, device);
void ALSAPool::set_card_state(unsigned index, ALSAPool::Device::State state)
{
- lock_guard<mutex> lock(mu);
- devices[index].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()
+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)
{
- 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();
+ 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();
}
projects / nageru / blobdiff