diff options
Diffstat (limited to 'libs')
| -rw-r--r-- | libs/backends/alsa/alsa_audiobackend.cc | 69 |
1 files changed, 69 insertions, 0 deletions
diff --git a/libs/backends/alsa/alsa_audiobackend.cc b/libs/backends/alsa/alsa_audiobackend.cc index fb9c128e71..7115af0206 100644 --- a/libs/backends/alsa/alsa_audiobackend.cc +++ b/libs/backends/alsa/alsa_audiobackend.cc @@ -28,7 +28,9 @@ #include "pbd/compose.h" #include "pbd/error.h" +#include "pbd/file_utils.h" #include "ardour/port_manager.h" +#include "ardour/system_exec.h" #include "i18n.h" using namespace ARDOUR; @@ -126,6 +128,72 @@ AlsaAudioBackend::enumerate_devices () const return s; } +static int card_to_num(const char* device_name) +{ + char* ctl_name; + const char * comma; + snd_ctl_t* ctl_handle; + int i = -1; + + if (strncasecmp(device_name, "plughw:", 7) == 0) { + device_name += 4; + } + if (!(comma = strchr(device_name, ','))) { + ctl_name = strdup(device_name); + } else { + ctl_name = strndup(device_name, comma - device_name); + } + + if (snd_ctl_open (&ctl_handle, ctl_name, 0) >= 0) { + snd_ctl_card_info_t *card_info; + snd_ctl_card_info_alloca (&card_info); + if (snd_ctl_card_info(ctl_handle, card_info) >= 0) { + i = snd_ctl_card_info_get_card(card_info); + } + snd_ctl_close(ctl_handle); + } + free(ctl_name); + return i; +} + +static void acquire_device(const char* device_name) +{ + /* This is quick hack, ideally we'll link against libdbus and implement a dbus-listener + * that owns the device. here we try to get away by just requesting it and then block it... + * (pulseaudio periodically checks anyway) + * + * dbus-send --session --print-reply --type=method_call --dest=org.freedesktop.ReserveDevice1.Audio2 /org/freedesktop/ReserveDevice1/Audio2 org.freedesktop.ReserveDevice1.RequestRelease int32:4 + * -> should not return 'boolean false' + */ + int device_number = card_to_num(device_name); + if (device_number < 0) return; + + std::string dbus_send_path; + if (PBD::find_file_in_search_path (PBD::Searchpath(Glib::getenv("PATH")), X_("dbus-send"), dbus_send_path)) { + char **argp; + char tmp[128]; + argp=(char**) calloc(8,sizeof(char*)); + argp[0] = strdup(dbus_send_path.c_str()); + argp[1] = strdup("--session"); + argp[2] = strdup("--print-reply"); // need to wait for the receiver to act. + argp[3] = strdup("--type=method_call"); + snprintf(tmp, sizeof(tmp), "--dest=org.freedesktop.ReserveDevice1.Audio%d", device_number); + argp[4] = strdup(tmp); + snprintf(tmp, sizeof(tmp), "/org/freedesktop/ReserveDevice1/Audio%d", device_number); + argp[5] = strdup(tmp); + argp[6] = strdup("org.freedesktop.ReserveDevice1.RequestRelease"); + argp[7] = strdup("int32:4294967296"); + snprintf(tmp, sizeof(tmp), "string:'org.freedesktop.ReserveDevice1.Audio%d'", device_number); + argp[7] = strdup(tmp); + argp[8] = 0; + + ARDOUR::SystemExec process (dbus_send_path, argp); + if (!process.start(1)) { + process.wait(); + } + } +} + std::vector<float> AlsaAudioBackend::available_sample_rates (const std::string&) const { @@ -436,6 +504,7 @@ AlsaAudioBackend::_start (bool for_latency_measurement) assert(_pcmi == 0); unsigned int pos = _capture_device.find(" "); + acquire_device(_capture_device.substr(0, pos).c_str()); _pcmi = new Alsa_pcmi (_capture_device.substr(0, pos).c_str(), _playback_device.substr(0, pos).c_str(), 0, _samplerate, _samples_per_period, _periods_per_cycle, 0); switch (_pcmi->state ()) { case 0: /* OK */ break; |