-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) {
- if (device.input != nullptr) {
- device.input->stop_capture_thread();
- delete device.input;
- }
- }
-}
-
-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; ) {
- add_device(card_index, dev_index);
- }
- }
-}
-
-bool ALSAPool::add_device(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 false;
- }
- 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.
- return false;
- }
-
- 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) {
- // TODO: When we go to hotplug support, we should support some
- // retry here, as the device could legitimately be busy.
- printf("%s: %s\n", address, snd_strerror(err));
- return false;
- }
- 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 false;
- }
- 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 false;
- }
- snd_pcm_close(pcm_handle);
- }
-
- if (num_channels == 0) {
- printf("%s: No channel maps with channels\n", address);
- return true;
- }
-
- snd_ctl_card_info_t *card_info;
- snd_ctl_card_info_alloca(&card_info);
- snd_ctl_card_info(ctl, card_info);
-
- Device dev;
- dev.address = address;
- dev.name = snd_ctl_card_info_get_name(card_info);
- dev.info = snd_pcm_info_get_name(pcm_info);
- dev.num_channels = num_channels;
- dev.state = Device::State::RUNNING;
-
- lock_guard<mutex> lock(mu);
- devices.push_back(std::move(dev));
- return true;
-}
-
-void ALSAPool::init()
-{
- enumerate_devices();
-}
-
-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?
- inputs[index].reset(new ALSAInput(device->address.c_str(), OUTPUT_FREQUENCY, device->num_channels, bind(&AudioMixer::add_audio, global_audio_mixer, DeviceSpec{InputSourceType::ALSA_INPUT, index}, _1, _2, _3, _4)));
- 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;
-}