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shairport-sync/common.h
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#ifdef __cplusplus
extern "C" {
#endif
#ifndef _COMMON_H
#define _COMMON_H
#define _GNU_SOURCE
#include <sys/types.h> // for mode_t
#include <unistd.h> // for useconds_t
#include "config.h"
#include "definitions.h"
#include "mdns.h"
// struct sockaddr_in6 is bigger than struct sockaddr. derp
#ifdef AF_INET6
#define SOCKADDR struct sockaddr_storage
#define SAFAMILY ss_family
#else
#define SOCKADDR struct sockaddr
#define SAFAMILY sa_family
#endif
#if defined(CONFIG_DBUS_INTERFACE) || defined(CONFIG_MPRIS_INTERFACE)
#include <glib.h>
typedef enum {
DBT_default = 0,
DBT_system, // use the system bus
DBT_session, // use the session bus
} dbus_message_bus_t;
#endif
typedef enum {
TOE_normal,
TOE_emergency,
} type_of_exit_type;
#define sps_extra_code_output_stalled 32768
#define sps_extra_code_output_state_cannot_make_ready 32769
// yeah/no/auto
typedef enum { YNA_AUTO = -1, YNA_NO = 0, YNA_YES = 1 } yna_type;
// yeah/no/dont-care
typedef enum { YNDK_DONT_KNOW = -1, YNDK_NO = 0, YNDK_YES = 1 } yndk_type;
typedef enum {
SS_LITTLE_ENDIAN = 0,
SS_PDP_ENDIAN,
SS_BIG_ENDIAN,
} endian_type;
typedef enum {
ST_basic = 0, // straight deletion or insertion of a frame in a 352-frame packet
ST_vernier, // interpolate from 352/1024 samples to 353/1025 or 351/1023
ST_soxr, // use libsoxr to make a 352 frame packet one frame longer or shorter
ST_auto, // use soxr if compiled for it and if the soxr_index is low enough
} stuffing_type;
typedef enum {
ST_stereo = 0,
ST_mono,
ST_reverse_stereo,
ST_left_only,
ST_right_only,
} playback_mode_type;
typedef enum {
VCP_standard = 0,
VCP_flat,
VCP_dasl_tapered,
} volume_control_profile_type;
typedef enum {
decoder_hammerton = 0,
decoder_apple_alac,
decoder_ffmpeg_alac,
} decoders_supported_type;
typedef enum {
disable_standby_off = 0,
disable_standby_auto,
disable_standby_always
} disable_standby_mode_type;
// the following enum is for the formats recognised -- currently only S16LE is recognised for input,
// so these are output only for the present
// ensure sps_format_sample_size_array and sps_format_description_string_array are in sync with
// this!
typedef enum {
SPS_FORMAT_UNKNOWN = 0,
SPS_FORMAT_S8,
SPS_FORMAT_LOWEST = SPS_FORMAT_S8,
SPS_FORMAT_U8,
SPS_FORMAT_S16_LE,
SPS_FORMAT_S16_BE,
SPS_FORMAT_S24_LE,
SPS_FORMAT_S24_BE,
SPS_FORMAT_S24_3LE,
SPS_FORMAT_S24_3BE,
SPS_FORMAT_S32_LE,
SPS_FORMAT_S32_BE,
SPS_FORMAT_HIGHEST_NATIVE = SPS_FORMAT_S32_BE,
SPS_FORMAT_S16,
SPS_FORMAT_S24,
SPS_FORMAT_S32,
SPS_FORMAT_AUTO,
SPS_FORMAT_INVALID,
} sps_format_t;
typedef enum {
SPS_RATE_UNKNOWN = 0,
SPS_RATE_5512,
SPS_RATE_LOWEST = SPS_RATE_5512,
SPS_RATE_8000,
SPS_RATE_11025,
SPS_RATE_16000,
SPS_RATE_22050,
SPS_RATE_32000,
SPS_RATE_44100,
SPS_RATE_48000,
SPS_RATE_64000,
SPS_RATE_88200,
SPS_RATE_96000,
SPS_RATE_176400,
SPS_RATE_192000,
SPS_RATE_352800,
SPS_RATE_384000,
SPS_RATE_HIGHEST = SPS_RATE_384000,
SPS_RATE_ILLEGAL,
} sps_rate_t;
// these sets omit the _UNKNOWN, _AUTO and _ILLEGAL values
#define SPS_FORMAT_SET (((1 << (SPS_FORMAT_HIGHEST_NATIVE + 1)) - 1) - (1 << SPS_FORMAT_UNKNOWN))
#define SPS_RATE_SET (((1 << (SPS_RATE_HIGHEST + 1)) - 1) - (1 << SPS_RATE_UNKNOWN))
#define SPS_CHANNEL_SET (((1 << (8 + 1)) - 1) - (1 << 0)) // channels 1 to 8, not 0-based!
#ifndef CONFIG_AIRPLAY_2
#define SPS_FORMAT_NON_FFMPEG_SET SPS_FORMAT_SET
#define SPS_RATE_NON_FFMPEG_SET \
((1 << SPS_RATE_44100) | (1 << SPS_RATE_88200) | (1 << SPS_RATE_176400) | (1 << SPS_RATE_352800))
#define SPS_CHANNNEL_NON_FFMPEG_SET (1 << 2)
#endif
// up to 1048576 fps, but must be an even number
#define RATE_FROM_ENCODED_FORMAT(encoded_format) (((encoded_format >> 6) & 0x7FFFF) * 2)
#define RATE_TO_ENCODED_FORMAT(rate) (((rate / 2) & 0x7FFFF) << 6)
// up to 127 channels
#define CHANNELS_FROM_ENCODED_FORMAT(encoded_format) ((encoded_format >> 25) & 0x7F)
#define CHANNELS_TO_ENCODED_FORMAT(channels) ((channels & 0x7F) << 25)
// up to 64 different SPS_FORMATs
#define FORMAT_FROM_ENCODED_FORMAT(encoded_format) (encoded_format & 0x3F)
#define FORMAT_TO_ENCODED_FORMAT(format) (format & 0x3F)
const char *short_format_description(int32_t encoded_format);
const char *sps_format_description_string(sps_format_t format);
unsigned int sps_format_sample_size(sps_format_t format);
unsigned int sps_rate_actual_rate(sps_rate_t rate);
typedef struct {
double missing_port_dacp_scan_interval_seconds; // if no DACP port number can be found, check at
// these intervals
double resend_control_first_check_time; // wait this long before asking for a missing packet to be
// resent
double resend_control_check_interval_time; // wait this long between making requests
double resend_control_last_check_time; // if the packet is missing this close to the time of use,
// give up
pthread_mutex_t lock;
config_t *cfg;
int endianness;
double airplay_volume; // stored here for reloading when necessary
double default_airplay_volume;
char *appName; // normally the app is called shairport-syn, but it may be symlinked
char *password;
char *service_name; // the name for the shairport service, e.g. "Shairport Sync Version %v running
// on host %h"
#ifdef CONFIG_PULSEAUDIO
char *pa_server; // the pulseaudio server address that Shairport Sync will play on.
char *pa_application_name; // the name under which Shairport Sync shows up as an "Application" in
// the Sound Preferences in most desktop Linuxes.
// Defaults to "Shairport Sync". Shairport Sync must be playing to see it.
char *pa_sink; // the name (or id) of the sink that Shairport Sync will play on.
#endif
#ifdef CONFIG_PIPEWIRE
char *pw_application_name; // the name under which Shairport Sync shows up as an "Application" in
// the Sound Preferences in most desktop Linuxes.
// Defaults to "Shairport Sync".
char *pw_node_name; // defaults to the application's name, usually "shairport-sync".
char *pw_sink_target; // leave this unset if you don't want to change the sink_target.
#endif
#ifdef CONFIG_METADATA
int metadata_enabled;
char *metadata_pipename;
char *metadata_sockaddr;
int metadata_sockport;
size_t metadata_sockmsglength;
int get_coverart;
double metadata_progress_interval; // 0 means no progress reports
#endif
#ifdef CONFIG_MQTT
int mqtt_enabled;
char *mqtt_hostname;
int mqtt_port;
char *mqtt_username;
char *mqtt_password;
char *mqtt_capath;
char *mqtt_cafile;
char *mqtt_certfile;
char *mqtt_keyfile;
char *mqtt_topic;
int mqtt_publish_raw;
int mqtt_publish_parsed;
int mqtt_publish_cover;
int mqtt_enable_remote;
int mqtt_enable_autodiscovery;
char *mqtt_autodiscovery_prefix;
char *mqtt_empty_payload_substitute;
#endif
uint8_t ap1_prefix[6];
uint8_t hw_addr[8]; // only needs 6 but 8 is handy when converting this to a number
int port;
int udp_port_base;
int udp_port_range;
int ignore_volume_control;
int volume_max_db_set; // set to 1 if a maximum volume db has been set
int volume_max_db;
int no_sync; // disable synchronisation, even if it's available
int no_mmap; // disable use of mmap-based output, even if it's available
double resync_threshold; // if it gets out of whack by more than this number of seconds, do a
// resync. if zero, never do a resync.
int allow_session_interruption;
int timeout; // while in play mode, exit if no packets of audio come in for more than this number
// of seconds . Zero means never exit.
int dont_check_timeout; // this is used to maintain backward compatibility with the old -t option
// behaviour; only set by -t 0, cleared by everything else
char *output_name;
audio_output *output;
char *mdns_name;
mdns_backend *mdns;
int buffer_start_fill;
uint32_t userSuppliedLatency; // overrides all other latencies -- use with caution
uint32_t fixedLatencyOffset; // add this to all automatic latencies supplied to get the actual
// total latency
// the total latency will be limited to the min and max-latency values, if supplied
#ifdef CONFIG_LIBDAEMON
int daemonise;
int daemonise_store_pid; // don't try to save a PID file
char *piddir;
char *computed_piddir; // the actual pid directory to create, if any
char *pidfile;
#endif
int log_fd; // file descriptor of the file or pipe to log stuff to.
char *log_file_path; // path to file or pipe to log to, if any
int logOutputLevel; // log output level
int debugger_show_elapsed_time; // in the debug message, display the time since startup
int debugger_show_relative_time; // in the debug message, display the time since the last one
int debugger_show_file_and_line; // in the debug message, display the filename and line number
int statistics_requested, use_negotiated_latencies;
playback_mode_type playback_mode;
char *cmd_start, *cmd_stop, *cmd_set_volume, *cmd_unfixable;
char *cmd_active_start, *cmd_active_stop;
int cmd_blocking, cmd_start_returns_output;
double tolerance; // allow this much drift before attempting to correct it
stuffing_type packet_stuffing;
int soxr_delay_index;
int soxr_delay_threshold; // the soxr delay must be less or equal to this for soxr interpolation
// to be enabled under the auto setting
int decoders_supported;
int decoder_in_use;
// char *logfile;
// char *errfile;
char *configfile;
char *regtype; // The regtype is the service type followed by the protocol, separated by a dot, by
// default “_raop._tcp.” for AirPlay 1.
char *regtype2; // The regtype is the service type followed by the protocol, separated by a dot,
// by default “_raop._tcp.” for AirPlay 2.
char *interface; // a string containg the interface name, or NULL if nothing specified
int interface_index; // only valid if the interface string is non-NULL
double audio_backend_buffer_desired_length; // this will be the length in seconds of the
// audio backend buffer -- the DAC buffer for ALSA
double audio_backend_buffer_interpolation_threshold_in_seconds; // below this, soxr interpolation
// will not occur -- it'll be
// basic interpolation instead.
double disable_standby_mode_silence_threshold; // below this, silence will be added to the output
// buffer
double disable_standby_mode_silence_scan_interval; // check the threshold this often
double audio_backend_latency_offset; // this will be the offset in seconds to compensate for any
// fixed latency there might be in the audio path
int audio_backend_silent_lead_in_time_auto; // true if the lead-in time should be from as soon as
// packets are received
double audio_backend_silent_lead_in_time; // the length of the silence that should precede a play.
uint32_t minimum_free_buffer_headroom; // when effective latency is calculated, ensure this number
// of buffers are unallocated
double active_state_timeout; // the amount of time from when play ends to when the system leaves
// into the "active" mode.
uint32_t volume_range_db; // the range, in dB, from max dB to min dB. Zero means use the mixer's
// native range.
int volume_range_hw_priority; // when extending the volume range by combining sw and hw
// attenuators, lowering the volume, use all the hw attenuation
// before using
// sw attenuation
volume_control_profile_type volume_control_profile;
int output_format_auto_requested; // true if the configuration requests auto configuration
int output_rate_auto_requested; // true if the configuration requests auto configuration
uint32_t current_output_configuration;
// these are the formats/rate and channel configurations permitted by the settings or defaults
uint32_t format_set;
uint32_t rate_set;
uint32_t channel_set;
#ifdef CONFIG_CONVOLUTION
int convolution;
int convolver_valid;
char *convolution_ir_file;
float convolution_gain;
int convolution_max_length;
#endif
int loudness;
float loudness_reference_volume_db;
int alsa_use_hardware_mute;
double alsa_maximum_stall_time;
disable_standby_mode_type disable_standby_mode;
volatile int keep_dac_busy;
yna_type use_precision_timing; // defaults to no
#ifdef CONFIG_METADATA_HUB
char *cover_art_cache_dir;
int retain_coverart;
int scan_interval_when_active; // number of seconds between DACP server scans when playing
// something (1)
int scan_interval_when_inactive; // number of seconds between DACP server scans playing nothing
// (3)
int scan_max_bad_response_count; // number of successive bad results to ignore before giving up
// (10)
int scan_max_inactive_count; // number of scans to do before stopping if not made active again
// (about 15 minutes worth)
#endif
int disable_resend_requests; // set this to stop resend request being made for missing packets
double diagnostic_drop_packet_fraction; // pseudo randomly drop this fraction of packets, for
// debugging. Currently audio packets only...
#ifdef CONFIG_JACK
char *jack_client_name;
char *jack_autoconnect_pattern;
#ifdef CONFIG_SOXR
int jack_soxr_resample_quality;
#endif
#endif
void *gradients; // a linked list of the clock gradients discovered for all DACP IDs
// can't use IP numbers as they might be given to different devices
// can't get hold of MAC addresses.
// can't define the nvll linked list struct here
char *firmware_version;
// use these in information requests
char *model;
char *srcvers;
char *osvers;
#ifdef CONFIG_AIRPLAY_2
uint64_t airplay_features;
uint32_t airplay_statusflags;
char *airplay_fex; // a base64-encoded version of the airplay_features in little-endian form
char *airplay_device_id; // for the Bonjour advertisement and the GETINFO PList
char *airplay_pin; // non-NULL, 4 char PIN, if required for pairing
char *airplay_pi; // UUID in the Bonjour advertisement and the GETINFO Plist
char *airplay_pgid; // UUID in the txtAirPlay data sent on the event channel
char *airplay_psi; // type 4 fixed UUID
uint8_t airplay_pk[32]; // public key
char *pk_string;
char *nqptp_shared_memory_interface_name; // client name for nqptp service
#endif
int unfixable_error_reported; // only report once.
uint64_t eight_channel_layout; // non-zero means enabled and is a channel layout
uint64_t six_channel_layout; // non-zero means enabled and is a channel layout
int mixdown_enable;
uint64_t mixdown_channel_layout; // if mixdown_enable is true, 0 signifies auto, based on number
// of channels
int output_channel_mapping_enable; // 0 means off, non-zero means on. If on and
// output_channel_map_size is 0, use the device's channel map
const char *output_channel_map[8]; // names of the output channels
unsigned int output_channel_map_size; // number of output channels
#if defined(CONFIG_DBUS_INTERFACE) || defined(CONFIG_MPRIS_INTERFACE)
GMainLoop *glib_worker_loop;
// for clean quitting from a dbus interface quit request (from the DBus or MPRIS interfaces)
int quit_requested_from_glib_mainloop; // remember that it initialised to zero.
dbus_message_bus_t dbus_default_message_bus;
#if defined(CONFIG_DBUS_INTERFACE)
dbus_message_bus_t dbus_service_bus_type;
#endif
#if defined(CONFIG_MPRIS_INTERFACE)
dbus_message_bus_t mpris_service_bus_type;
#endif
#endif
} shairport_cfg;
uint32_t nctohl(const uint8_t *p); // read 4 characters from *p and do ntohl on them
uint16_t nctohs(const uint8_t *p); // read 2 characters from *p and do ntohs on them
uint64_t nctoh64(const uint8_t *p); // read 8 characters from *p to a uint64_t
void memory_barrier();
void log_to_stderr(); // call this to direct logging to stderr;
void log_to_stdout(); // call this to direct logging to stdout;
void log_to_syslog(); // call this to direct logging to the system log;
void log_to_file(); // call this to direct logging to a file or (pre-existing) pipe;
// true if Shairport Sync is supposed to be sending output to the output device, false otherwise
int get_requested_connection_state_to_output();
void set_requested_connection_state_to_output(int v);
int try_to_open_pipe_for_writing(
const char *pathname); // open it without blocking if it's not hooked up
/* from
* http://coding.debuntu.org/c-implementing-str_replace-replace-all-occurrences-substring#comment-722
*/
char *str_replace(const char *string, const char *substr, const char *replacement);
// based on http://burtleburtle.net/bob/rand/smallprng.html
void r64init(uint64_t seed);
uint64_t r64u();
int64_t r64i();
// if you are breaking in to a session, you need to avoid the ports of the current session
// if you are law-abiding, then you can reuse the ports.
// so, you can reset the free UDP ports minder when you're legit, and leave it otherwise
// the downside of using different ports each time is that it might make the firewall
// rules a bit more complex, as they need to allow more than the minimum three ports.
// a range of 10 is suggested anyway
void resetFreeUDPPort();
uint16_t nextFreeUDPPort();
extern volatile int debuglev;
void _die(const char *filename, const int linenumber, const char *format, ...);
void _warn(const char *filename, const int linenumber, const char *format, ...);
void _inform(const char *filename, const int linenumber, const char *format, ...);
void _debug(const char *filename, const int linenumber, int level, const char *format, ...);
void _debug_print_buffer(const char *thefilename, const int linenumber, int level, void *buf,
size_t buf_len);
#define die(...) _die(__FILE__, __LINE__, __VA_ARGS__)
#define debug(...) _debug(__FILE__, __LINE__, __VA_ARGS__)
#define warn(...) _warn(__FILE__, __LINE__, __VA_ARGS__)
#define inform(...) _inform(__FILE__, __LINE__, __VA_ARGS__)
#define debug_print_buffer(...) _debug_print_buffer(__FILE__, __LINE__, __VA_ARGS__)
// Thanks to https://stackoverflow.com/a/1597129 for the inspiration for this identifier generation
#define MAKEUNIQUEID2(x, y) x##y
#define MADEID(x, y) MAKEUNIQUEID2(x, y)
// do X once, and never again until the app is restarted
#define once(X) \
static int MADEID(once_flag_, __LINE__) = 0; \
if (MADEID(once_flag_, __LINE__) == 0) { \
X; \
MADEID(once_flag_, __LINE__) = 1; \
}
// do X once, and then ignore repeated calls until they stop for more than one second
#define once_per_1_second_burst(X) \
static uint64_t MADEID(time_, __LINE__) = 0; \
int64_t MADEID(interval_, __LINE__) = get_absolute_time_in_ns() - MADEID(time_, __LINE__); \
if ((MADEID(time_, __LINE__) == 0) || (MADEID(interval_, __LINE__) > 1000000000L)) \
X; \
MADEID(time_, __LINE__) = get_absolute_time_in_ns()
void getErrorText(char *destinationString, size_t destinationStringLength);
uint8_t *base64_dec(char *input, int *outlen);
char *base64_enc(uint8_t *input, int length);
char *base64_encode_so(const unsigned char *data, size_t input_length, char *encoded_data,
size_t *output_length);
#define RSA_MODE_AUTH (0)
#define RSA_MODE_KEY (1)
uint8_t *rsa_apply(uint8_t *input, int inlen, int *outlen, int mode);
// given a volume (0 to -30) and high and low attenuations in dB*100 (e.g. 0 to -6000 for 0 to -60
// dB), return an attenuation depending on a linear interpolation along the range
double flat_vol2attn(double vol, long max_db, long min_db);
// The intention behind dasl_tapered is that a given percentage change in volume should result in
// the same percentage change in perceived loudness. For instance, doubling the volume level should
// result in doubling the perceived loudness. With the range of AirPlay volume being from -30 to 0,
// doubling the volume from -22.5 to -15 results in an increase of 10 dB. Similarly, doubling the
// volume from -15 to 0 results in an increase of 10 dB. For compatibility with mixers having a
// restricted attenuation range (e.g. 30 dB), "dasl_tapered" will switch to a flat profile at low
// AirPlay volumes.
double dasl_tapered_vol2attn(double vol, long max_db, long min_db);
// given a volume (0 to -30) and high and low attenuations in dB*100 (e.g. 0 to -6000 for 0 to -60
// dB), return an attenuation depending on the transfer function
double vol2attn(double vol, long max_db, long min_db);
// return a time in nanoseconds
#ifdef COMPILE_FOR_LINUX_AND_FREEBSD_AND_CYGWIN_AND_OPENBSD
// Not defined for macOS
uint64_t get_realtime_in_ns(void);
#endif
uint64_t get_absolute_time_in_ns(void); // monotonic_raw or monotonic
uint64_t get_monotonic_time_in_ns(void); // NTP-disciplined
// time at startup for debugging timing
extern uint64_t ns_time_at_startup, ns_time_at_last_debug_message;
// this is for reading an unsigned 32 bit number, such as an RTP timestamp
uint32_t uatoi(const char *nptr);
extern shairport_cfg config;
extern config_t config_file_stuff;
extern int type_of_exit_cleanup; // normal, emergency, dbus requested...
extern uint64_t minimum_dac_queue_size;
int config_lookup_non_empty_string(const config_t * the_config, const char * path, const char ** value);
int config_set_lookup_bool(config_t *cfg, char *where, int *dst);
int check_string_or_list_setting(config_setting_t *setting, const char *item);
int check_int_or_list_setting(config_setting_t *setting, const int item);
unsigned int config_get_string_settings_as_string_array(config_setting_t *setting,
const char ***result);
unsigned int config_get_int_settings_as_int_array(config_setting_t *setting, int **result);
void command_start(void);
void command_stop(void);
void command_execute(const char *command, const char *extra_argument, const int block);
void command_set_volume(double volume);
int mkpath(const char *path, mode_t mode);
void sps_shutdown(type_of_exit_type shutdown_type); // TOE_normal, TOE_emergency, TOE_dbus
extern sigset_t pselect_sigset;
extern pthread_mutex_t the_conn_lock;
#define conn_lock(arg) \
pthread_mutex_lock(&the_conn_lock); \
arg; \
pthread_mutex_unlock(&the_conn_lock);
// wait for the specified time in microseconds -- it checks every 20 milliseconds
// int sps_pthread_mutex_timedlock(pthread_mutex_t *mutex, useconds_t dally_time,
// const char *debugmessage, int debuglevel);
// wait for the specified time, checking every 20 milliseconds, and block if it can't acquire the
// lock
int _debug_mutex_lock(pthread_mutex_t *mutex, useconds_t dally_time, const char *mutexName,
const char *filename, const int line, int debuglevel);
#define debug_mutex_lock(mu, t, d) _debug_mutex_lock(mu, t, #mu, __FILE__, __LINE__, d)
int _debug_mutex_unlock(pthread_mutex_t *mutex, const char *mutexName, const char *filename,
const int line, int debuglevel);
#define debug_mutex_unlock(mu, d) _debug_mutex_unlock(mu, #mu, __FILE__, __LINE__, d)
void pthread_cleanup_debug_mutex_unlock(void *arg);
#define pthread_cleanup_debug_mutex_lock(mu, t, d) \
if (_debug_mutex_lock(mu, t, #mu, __FILE__, __LINE__, d) == 0) \
pthread_cleanup_push(pthread_cleanup_debug_mutex_unlock, (void *)mu)
#define config_lock \
if (pthread_mutex_trylock(&config.lock) != 0) { \
debug(1, "config_lock: cannot acquire config.lock"); \
}
#define config_unlock pthread_mutex_unlock(&config.lock)
int do_pthread_setname(pthread_t *restrict thread, const char *format, ...);
int named_pthread_create(pthread_t *restrict thread, const pthread_attr_t *restrict attr,
void *(*start_routine)(void *), void *restrict arg, const char *format,
...);
int named_pthread_create_with_priority(pthread_t *thread, int priority,
void *(*start_routine)(void *), void *arg,
const char *format, ...);
extern pthread_mutex_t r64_mutex;
#define r64_lock pthread_mutex_lock(&r64_mutex)
#define r64_unlock pthread_mutex_unlock(&r64_mutex)
char *get_version_string(); // mallocs a string space -- remember to free it afterwards
int64_t generate_zero_frames(char *outp, size_t number_of_frames, int with_dither,
int64_t random_number_in, uint32_t encoded_output_format);
void malloc_cleanup(void *arg);
int string_update_with_size(char **str, int *flag, char *s, size_t len);
// from https://stackoverflow.com/questions/13663617/memdup-function-in-c, with thanks
void *memdup(const void *mem, size_t size);
int bind_socket_and_port(int type, int ip_family, const char *self_ip_address, uint32_t scope_id,
uint16_t *port, int *sock);
uint16_t bind_UDP_port(int ip_family, const char *self_ip_address, uint32_t scope_id, int *sock);
void socket_cleanup(void *arg);
void mutex_unlock(void *arg);
void rwlock_unlock(void *arg);
void mutex_cleanup(void *arg);
void cv_cleanup(void *arg);
void thread_cleanup(void *arg);
#ifdef CONFIG_AIRPLAY_2
void plist_cleanup(void *arg);
#endif
char *debug_malloc_hex_cstring(void *packet, size_t nread);
// from https://stackoverflow.com/questions/13663617/memdup-function-in-c, with thanks
// allocates memory and copies the content to it
// analogous to strndup;
void *memdup(const void *mem, size_t size);
int get_device_id(uint8_t *id, int int_length);
char *bnprintf(char *buffer, ssize_t max_bytes, const char *format, ...);
#ifdef CONFIG_USE_GIT_VERSION_STRING
extern char git_version_string[];
#endif
#endif // _COMMON_H
#ifdef __cplusplus
}
#endif
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