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shairport-sync/shairport.c
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/*
* Shairport, an Apple Airplay receiver
* Copyright (c) James Laird 2013
* All rights reserved.
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use,
* copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*/
#include <signal.h>
#include <errno.h>
#include <unistd.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <memory.h>
#include <sys/wait.h>
#include <getopt.h>
#include <stdio.h>
#include <stdlib.h>
#include "config.h"
#ifdef HAVE_LIBPOLARSSL
#include <polarssl/md5.h>
#endif
#ifdef HAVE_LIBSSL
#include <openssl/md5.h>
#endif
#include "common.h"
#include "rtsp.h"
#include "mdns.h"
#include <libdaemon/dfork.h>
#include <libdaemon/dsignal.h>
#include <libdaemon/dlog.h>
#include <libdaemon/dpid.h>
#include <libdaemon/dexec.h>
static int shutting_down = 0;
void shairport_shutdown() {
if (shutting_down)
return;
shutting_down = 1;
mdns_unregister();
rtsp_shutdown_stream();
if (config.output)
config.output->deinit();
}
static void sig_ignore(int foo, siginfo_t *bar, void *baz) {
}
static void sig_shutdown(int foo, siginfo_t *bar, void *baz) {
daemon_log(LOG_NOTICE, "Shutdown requested...");
shairport_shutdown();
daemon_log(LOG_NOTICE, "Exit...");
daemon_retval_send(255);
daemon_pid_file_remove();
exit(0);
}
static void sig_child(int foo, siginfo_t *bar, void *baz) {
pid_t pid;
while ((pid = waitpid((pid_t)-1, 0, WNOHANG)) > 0) {
if (pid == mdns_pid && !shutting_down) {
die("MDNS child process died unexpectedly!");
}
}
}
static void sig_logrotate(int foo, siginfo_t *bar, void *baz) {
// log_setup();
}
void print_version(void) {
char version_string[200];
strcpy(version_string,PACKAGE_VERSION);
#ifdef HAVE_LIBPOLARSSL
strcat(version_string,"-polarssl");
#endif
#ifdef HAVE_LIBSSL
strcat(version_string,"-openssl");
#endif
#ifdef CONFIG_TINYSVCMDNS
strcat(version_string,"-tinysvcmdns");
#endif
#ifdef CONFIG_AVAHI
strcat(version_string,"-Avahi");
#endif
#ifdef CONFIG_DNS_SD
strcat(version_string,"-dns_sd");
#endif
#ifdef CONFIG_ALSA
strcat(version_string,"-ALSA");
#endif
#ifdef CONFIG_SNDIO
strcat(version_string,"-sndio");
#endif
#ifdef CONFIG_AO
strcat(version_string,"-ao");
#endif
#ifdef CONFIG_PULSE
strcat(version_string,"-pulse");
#endif
#ifdef HAVE_LIBSOXR
strcat(version_string,"-soxr");
#endif
printf("%s\n",version_string);
}
void usage(char *progname) {
printf("Usage: %s [options...]\n", progname);
printf(" or: %s [options...] -- [audio output-specific options]\n", progname);
printf("\n");
printf("Mandatory arguments to long options are mandatory for short options too.\n");
printf("\n");
printf("Options:\n");
printf(" -h, --help show this help\n");
printf(" -V, --version show version information\n");
printf(" -v, --verbose -v print debug information; -vv more; -vvv lots\n");
printf(" -p, --port=PORT set RTSP listening port\n");
printf(" -a, --name=NAME set advertised name\n");
printf(" -A, --AirPlayLatency=FRAMES set how many frames between a just-received frame and audio output\n");
printf(" if the source's User Agent is \"AirPlay\". The default value is %u frames.\n", config.AirPlayLatency);
printf(" -i, --iTunesLatency=FRAMES set how many frames between a just-received frame and audio output\n");
printf(" if the source's User Agent is \"iTunes\". The default value is %u frames.\n", config.iTunesLatency);
printf(" -L, --latency=FRAMES set how many frames between a just-received frame and audio output\n");
printf(" starts. This value is in frames; if non-zero overrides all other latencies.\n");
printf(" Default latency without \"AirPlay\" or \"iTunes\" User Agent is %u frames.\n", config.AirPlayLatency);
printf(" -S, --stuffing=MODE set how to adjust current latency to match desired latency \n");
printf(" \"basic\" (default) inserts or deletes audio frames from packet frames with low processor overhead.\n");
printf(" \"soxr\" uses libsoxr to minimally resample packet frames -- moderate processor overhead.\n");
printf(" \"soxr\" option only available if built with soxr support.\n");
printf(" -d, --daemon daemonise.\n");
printf(" -k, --kill kill the existing shairport daemon.\n");
printf(" -B, --on-start=PROGRAM run PROGRAM when playback is about to begin.\n");
printf(" -E, --on-stop=PROGRAM run PROGRAM when playback has ended.\n");
printf(" For -B and -E options, specify the full path to the program, e.g. /usr/bin/logger.\n");
printf(" Executable scripts work, but must have #!/bin/sh (or whatever) in the headline.\n");
printf(" -w, --wait-cmd wait until the -B or -E programs finish before continuing\n");
printf(" -o, --output=BACKEND select audio output method\n");
printf(" -m, --mdns=BACKEND force the use of BACKEND to advertize the service\n");
printf(" if no mdns provider is specified,\n");
printf(" shairport tries them all until one works.\n");
printf(" -r, --resync=THRESHOLD resync if error exceeds this number of frames. Set to 0 to stop resyncing.\n");
printf(" -t, --timeout=SECONDS go back to idle mode from play mode after a break in communications of this many seconds (default 120). Set to 0 never to exit play mode.\n");
printf("\n");
mdns_ls_backends();
printf("\n");
audio_ls_outputs();
}
int parse_options(int argc, char **argv) {
// prevent unrecognised arguments from being shunted to the audio driver
setenv("POSIXLY_CORRECT", "", 1);
char version_string[200];
static struct option long_options[] = {
{"help", no_argument, NULL, 'h'},
{"version", no_argument, NULL, 'V'},
{"verbose", no_argument, NULL, 'v'},
{"daemon", no_argument, NULL, 'd'},
{"kill", no_argument, NULL, 'k'},
{"port", required_argument, NULL, 'p'},
{"name", required_argument, NULL, 'a'},
{"output", required_argument, NULL, 'o'},
{"on-start",required_argument, NULL, 'B'},
{"on-stop", required_argument, NULL, 'E'},
{"wait-cmd",no_argument, NULL, 'w'},
{"mdns", required_argument, NULL, 'm'},
{"latency", required_argument, NULL, 'L'},
{"stuffing", required_argument, NULL, 'S'},
{"AirPlayLatency", required_argument, NULL, 'A'},
{"iTunesLatency", required_argument, NULL, 'i'},
{"resync", required_argument, NULL, 'r'},
{"timeout", required_argument, NULL, 't'},
{NULL, 0, NULL, 0}
};
int opt;
while ((opt = getopt_long(argc, argv,
"+hdvVkp:a:o:b:B:E:wm:L:S:A:i:r:t:",
long_options, NULL)) > 0) {
switch (opt) {
// Note -- Version, Kill and Help done separately
default:
case 't':
config.timeout = atoi(optarg);
break;
case 'r':
config.resyncthreshold = atoi(optarg);
break;
case 'd':
config.daemonise = 1;
break;
case 'v':
debuglev++;
break;
case 'p':
config.port = atoi(optarg);
break;
case 'a':
config.apname = optarg;
break;
case 'o':
config.output_name = optarg;
break;
case 'L':
config.userSuppliedLatency = atoi(optarg);
break;
case 'A':
config.AirPlayLatency = atoi(optarg);
break;
case 'i':
config.iTunesLatency = atoi(optarg);
break;
case 'B':
config.cmd_start = optarg;
break;
case 'E':
config.cmd_stop = optarg;
break;
case 'S':
if (strcmp(optarg,"basic")==0)
config.packet_stuffing = ST_basic;
else if (strcmp(optarg,"soxr")==0)
#ifdef HAVE_LIBSOXR
config.packet_stuffing = ST_soxr;
#else
die("soxr option not available -- this version of shairport-sync was built without libsoxr support");
#endif
else
die("Illegal stuffing option -- must be \"basic\" or \"soxr\"");
break;
case 'w':
config.cmd_blocking = 1;
break;
case 'm':
config.mdns_name = optarg;
break;
}
}
return optind;
}
void signal_setup(void) {
// mask off all signals before creating threads.
// this way we control which thread gets which signals.
// for now, we don't care which thread gets the following.
sigset_t set;
sigfillset(&set);
sigdelset(&set, SIGINT);
sigdelset(&set, SIGTERM);
sigdelset(&set, SIGHUP);
sigdelset(&set, SIGSTOP);
sigdelset(&set, SIGCHLD);
pthread_sigmask(SIG_BLOCK, &set, NULL);
// setting this to SIG_IGN would prevent signalling any threads.
struct sigaction sa;
memset(&sa, 0, sizeof(sa));
sa.sa_flags = SA_SIGINFO;
sa.sa_sigaction = &sig_ignore;
sigaction(SIGUSR1, &sa, NULL);
sa.sa_flags = SA_SIGINFO | SA_RESTART;
sa.sa_sigaction = &sig_shutdown;
sigaction(SIGINT, &sa, NULL);
sigaction(SIGTERM, &sa, NULL);
sa.sa_sigaction = &sig_logrotate;
sigaction(SIGHUP, &sa, NULL);
sa.sa_sigaction = &sig_child;
sigaction(SIGCHLD, &sa, NULL);
}
// forked daemon lets the spawner know it's up and running OK
// should be called only once!
void shairport_startup_complete(void) {
if (config.daemonise) {
// daemon_ready();
}
}
int main(int argc, char **argv) {
daemon_set_verbosity(LOG_DEBUG);
/* Check if we are called with -V or --version parameter */
if (argc >= 2 && ((strcmp(argv[1], "-V")==0) || (strcmp(argv[1], "--version")==0))) {
print_version();
exit(1);
}
/* Check if we are called with -h or --help parameter */
if (argc >= 2 && ((strcmp(argv[1], "-h")==0) || (strcmp(argv[1], "--help")==0))) {
usage(argv[0]);
exit(1);
}
pid_t pid;
/* Reset signal handlers */
if (daemon_reset_sigs(-1) < 0) {
daemon_log(LOG_ERR, "Failed to reset all signal handlers: %s", strerror(errno));
return 1;
}
/* Unblock signals */
if (daemon_unblock_sigs(-1) < 0) {
daemon_log(LOG_ERR, "Failed to unblock all signals: %s", strerror(errno));
return 1;
}
/* Set indentification string for the daemon for both syslog and PID file */
daemon_pid_file_ident = daemon_log_ident = daemon_ident_from_argv0(argv[0]);
/* Check if we are called with -k or --kill parameter */
if (argc >= 2 && ((strcmp(argv[1], "-k")==0) || (strcmp(argv[1], "--kill")==0))) {
int ret;
/* Kill daemon with SIGTERM */
/* Check if the new function daemon_pid_file_kill_wait() is available, if it is, use it. */
if ((ret = daemon_pid_file_kill_wait(SIGTERM, 5)) < 0)
daemon_log(LOG_WARNING, "Failed to kill daemon: %s", strerror(errno));
else
daemon_pid_file_remove(); //
return ret < 0 ? 1 : 0;
}
/* Check that the daemon is not running twice at the same time */
if ((pid = daemon_pid_file_is_running()) >= 0) {
daemon_log(LOG_ERR, "Daemon already running on PID file %u", pid);
return 1;
}
memset(&config, 0, sizeof(config));
// set defaults
config.latency = 99400; // iTunes
config.userSuppliedLatency = 0; // zero means none supplied
config.iTunesLatency = 99400; // this seems to work pretty well for iTunes -- two left-ear headphones, one from the iMac jack, one from an NSLU2 running a cheap "3D Sound" USB Soundcard
config.AirPlayLatency = 88200; // this seems to work pretty well for AirPlay -- Syncs sound and vision on AppleTV, but also used for iPhone/iPod/iPad sources
config.resyncthreshold = 441*5; // this number of frames is 50 ms
config.timeout = 120; // this number of seconds to wait for [more] audio before switching to idle.
config.buffer_start_fill = 220;
config.port = 5000;
config.packet_stuffing = ST_basic; // simple interpolation or deletion
char hostname[100];
gethostname(hostname, 100);
config.apname = malloc(20 + 100);
snprintf(config.apname, 20 + 100, "Shairport Sync on %s", hostname);
// parse arguments into config
int audio_arg = parse_options(argc, argv);
// mDNS supports maximum of 63-character names (we append 13).
if (strlen(config.apname) > 50)
die("Supplied name too long (max 50 characters)");
/* here, daemonise with libdaemon */
if (config.daemonise) {
/* Prepare for return value passing from the initialization procedure of the daemon process */
if (daemon_retval_init() < 0) {
daemon_log(LOG_ERR, "Failed to create pipe.");
return 1;
}
/* Do the fork */
if ((pid = daemon_fork()) < 0) {
/* Exit on error */
daemon_retval_done();
return 1;
} else if (pid) { /* The parent */
int ret;
/* Wait for 20 seconds for the return value passed from the daemon process */
if ((ret = daemon_retval_wait(20)) < 0) {
daemon_log(LOG_ERR, "Could not receive return value from daemon process: %s", strerror(errno));
return 255;
}
if (ret != 0)
daemon_log(ret != 0 ? LOG_ERR : LOG_INFO, "Daemon returned %i as return value.", ret);
return ret;
} else { /* The daemon */
/* Close FDs */
if (daemon_close_all(-1) < 0) {
daemon_log(LOG_ERR, "Failed to close all file descriptors: %s", strerror(errno));
/* Send the error condition to the parent process */
daemon_retval_send(1);
goto finish;
}
/* Create the PID file */
if (daemon_pid_file_create() < 0) {
daemon_log(LOG_ERR, "Could not create PID file (%s).", strerror(errno));
daemon_retval_send(2);
goto finish;
}
/* Send OK to parent process */
daemon_retval_send(0);
}
/* end libdaemon stuff */
}
signal_setup();
config.output = audio_get_output(config.output_name);
if (!config.output) {
audio_ls_outputs();
die("Invalid audio output specified!");
}
config.output->init(argc-audio_arg, argv+audio_arg);
daemon_log(LOG_NOTICE, "Successful startup.");
uint8_t ap_md5[16];
#ifdef HAVE_LIBSSL
MD5_CTX ctx;
MD5_Init(&ctx);
MD5_Update(&ctx, config.apname, strlen(config.apname));
MD5_Final(ap_md5, &ctx);
#endif
#ifdef HAVE_LIBPOLARSSL
md5_context tctx;
md5_starts(&tctx);
md5_update(&tctx, (unsigned char *)config.apname, strlen(config.apname));
md5_finish(&tctx, ap_md5);
#endif
memcpy(config.hw_addr, ap_md5, sizeof(config.hw_addr));
rtsp_listen_loop();
// should not reach this...
shairport_shutdown();
finish:
daemon_log(LOG_NOTICE, "Unexpected exit...");
daemon_retval_send(255);
daemon_pid_file_remove();
return 1;
}
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