#ifdef __cplusplus extern "C" { #endif #ifndef _COMMON_H #define _COMMON_H #include #include #include #include #include #include #include #include "audio.h" #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) typedef enum { DBT_system = 0, // use the session bus DBT_session, // use the system bus } dbus_session_type; #endif #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_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, } volume_control_profile_type; typedef enum { decoder_hammerton = 0, decoder_apple_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 typedef enum { SPS_FORMAT_UNKNOWN = 0, SPS_FORMAT_S8, SPS_FORMAT_U8, SPS_FORMAT_S16, SPS_FORMAT_S16_LE, SPS_FORMAT_S16_BE, SPS_FORMAT_S24, SPS_FORMAT_S24_LE, SPS_FORMAT_S24_BE, SPS_FORMAT_S24_3LE, SPS_FORMAT_S24_3BE, SPS_FORMAT_S32, SPS_FORMAT_S32_LE, SPS_FORMAT_S32_BE, SPS_FORMAT_AUTO, SPS_FORMAT_INVALID, } sps_format_t; const char *sps_format_description_string(sps_format_t format); 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 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_PA 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_METADATA int metadata_enabled; char *metadata_pipename; char *metadata_sockaddr; int metadata_sockport; size_t metadata_sockmsglength; int get_coverart; #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; #endif uint8_t hw_addr[6]; 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 resyncthreshold; // if it get's out of whack my more than this number of seconds, resync. // Zero means never // 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 use_apple_decoder; // set to 1 if you want to use the apple decoder instead of the original by // David Hammerton // 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 sps_format_t output_format; int output_rate_auto_requested; // true if the configuration requests auto configuration unsigned int output_rate; #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 #if defined(CONFIG_DBUS_INTERFACE) dbus_session_type dbus_service_bus_type; #endif #if defined(CONFIG_MPRIS_INTERFACE) dbus_session_type mpris_service_bus_type; #endif #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 #ifdef CONFIG_AIRPLAY_2 uint64_t airplay_features; uint32_t airplay_statusflags; 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_gid; // UUID in the Bonjour advertisement -- initially the same as the pi #endif } shairport_cfg; // accessors to config for multi-thread access double get_config_airplay_volume(); void set_config_airplay_volume(double v); 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, ...); #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__) uint8_t *base64_dec(char *input, int *outlen); char *base64_enc(uint8_t *input, int 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 along the range double flat_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 monolithic (always increasing) time in nanoseconds // uint64_t get_absolute_time_in_fp(void); // obselete uint64_t get_absolute_time_in_ns(void); // 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); // this is for allowing us to cancel the whole program extern pthread_t main_thread_id; extern shairport_cfg config; extern config_t config_file_stuff; extern int emergency_exit; int config_set_lookup_bool(config_t *cfg, char *where, int *dst); 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 shairport_shutdown(); 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) 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, sps_format_t format, int with_dither, int64_t random_number_in); 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 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); // the difference between two unsigned 32-bit modulo values as a signed 32-bit result // now, if the two numbers are constrained to be within 2^(n-1)-1 of one another, // we can use their as a signed 2^n bit number which will be positive // if the first number is the same or "after" the second, and // negative otherwise int32_t mod32Difference(uint32_t a, uint32_t b); int get_device_id(uint8_t *id, int int_length); #ifdef CONFIG_USE_GIT_VERSION_STRING extern char git_version_string[]; #endif #endif // _COMMON_H #ifdef __cplusplus } #endif