140 lines
4.0 KiB
C
140 lines
4.0 KiB
C
/*
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* Copyright (C) 2014 Robin Gareus <robin@gareus.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <signal.h>
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#include <string.h>
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#include <fcntl.h>
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#include <errno.h>
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#include "ardouralsautil/reserve.h"
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static int run = 1;
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static void wearedone(int sig) {
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(void) sig; // skip 'unused variable' compiler warning;
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fprintf(stderr, "caught signal - shutting down.\n");
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run=0;
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}
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static int stdin_available(void) {
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errno = 0;
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if (fcntl(STDIN_FILENO, F_GETFD) == 1) return 0;
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return errno != EBADF;
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}
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static void usage(int status) {
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printf ("ardour-request-device - DBus Audio Reservation Utility.\n");
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printf ("Usage: ardour-request-device [ OPTIONS ] <Audio-Device-ID>\n");
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printf ("Options:\n\
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-h, --help display this help and exit\n\
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-V, --version print version information and exit\n\
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");
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printf ("\n\
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This tool issues a dbus request to reserve an ALSA Audio-device.\n\
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If successful other users of the device (e.g. pulseaudio) will\n\
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release the device so that ardour can access it.\n\
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\n\
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ardour-request-device announces itself as \"Ardour ALSA Backend\" and uses the\n\
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maximum possible priority for requesting the device.\n\
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\n\
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The audio-device-id is a string e.g. 'Audio1'\n\
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\n\
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Examples:\n\
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ardour-request-device Audio0\n\
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\n");
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printf ("Report bugs to Robin Gareus <robin@gareus.org>\n");
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exit (status);
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}
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static void print_version(void) {
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printf ("ardour-request-device 0.1\n\n");
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printf (
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"Copyright (C) 2014 Robin Gareus <robin@gareus.org>\n"
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"This is free software; see the source for copying conditions. There is NO\n"
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"warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n\n"
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);
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exit (0);
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}
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int main(int argc, char **argv) {
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DBusConnection* dbus_connection = NULL;
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rd_device * reserved_device = NULL;
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DBusError error;
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int ret;
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if (argc < 2 || argc > 2) {
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usage(EXIT_FAILURE);
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}
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if (!strcmp(argv[1], "-V") || !strcmp(argv[1], "--version")) {
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print_version();
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}
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if (!strcmp(argv[1], "-h") || !strcmp(argv[1], "--help")) {
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usage(EXIT_SUCCESS);
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}
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const char *device_name = argv[1];
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dbus_error_init(&error);
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if (!(dbus_connection = dbus_bus_get (DBUS_BUS_SESSION, &error))) {
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fprintf(stderr, "Failed to connect to session bus for device reservation: %s\n", error.message ? error.message : "unknown error.");
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dbus_error_free(&error);
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return EXIT_FAILURE;
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}
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if ((ret = rd_acquire (
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&reserved_device,
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dbus_connection,
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device_name,
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"Ardour ALSA Backend",
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INT32_MAX,
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NULL,
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&error)) < 0)
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{
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fprintf(stderr, "Failed to acquire device: '%s'\n%s\n", device_name, (error.message ? error.message : strerror(-ret)));
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dbus_error_free(&error);
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dbus_connection_unref(dbus_connection);
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return EXIT_FAILURE;
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}
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fprintf(stdout, "Acquired audio-card '%s'\n", device_name);
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fprintf(stdout, "Press Ctrl+C or close stdin to release the device.\n");
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fflush(stdout);
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signal(SIGTERM, wearedone);
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signal(SIGINT, wearedone);
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while (run && dbus_connection_read_write_dispatch (dbus_connection, 200)) {
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if (!stdin_available()) {
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fprintf(stderr, "stdin closed - shutting down.\n");
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break;
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}
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}
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rd_release (reserved_device);
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fprintf(stdout, "Released audio-card '%s'\n", device_name);
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dbus_error_free(&error);
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dbus_connection_unref(dbus_connection);
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return EXIT_SUCCESS;
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}
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