jack2/common/jack/types.h

/*
  Copyright (C) 2001 Paul Davis
  Copyright (C) 2004 Jack O'Quin

  This program is free software; you can redistribute it and/or modify
  it under the terms of the GNU Lesser General Public License as published by
  the Free Software Foundation; either version 2.1 of the License, or
  (at your option) any later version.

  This program is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU Lesser General Public License for more details.

  You should have received a copy of the GNU Lesser General Public License
  along with this program; if not, write to the Free Software
  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.

*/

#ifndef __jack_types_h__
#define __jack_types_h__

#include <jack/systemdeps.h>

typedef int32_t jack_shmsize_t;

/**
 * Type used to represent sample frame counts.
 */
typedef uint32_t        jack_nframes_t;

/**
 * Maximum value that can be stored in jack_nframes_t
 */
#define JACK_MAX_FRAMES (4294967295U)   /* This should be UINT32_MAX, but C++ has a problem with that. */

/**
 * Type used to represent the value of free running
 * monotonic clock with units of microseconds.
 */
typedef uint64_t jack_time_t;

/**
 *  Maximum size of @a load_init string passed to an internal client
 *  jack_initialize() function via jack_internal_client_load().
 */
#define JACK_LOAD_INIT_LIMIT 1024

/**
 *  jack_intclient_t is an opaque type representing a loaded internal
 *  client.  You may only access it using the API provided in @ref
 *  intclient.h "<jack/intclient.h>".
 */
typedef uint64_t jack_intclient_t;

/**
 *  jack_port_t is an opaque type.  You may only access it using the
 *  API provided.
 */
typedef struct _jack_port jack_port_t;

/**
 *  jack_client_t is an opaque type.  You may only access it using the
 *  API provided.
 */
typedef struct _jack_client jack_client_t;

/**
 *  Ports have unique ids. A port registration callback is the only
 *  place you ever need to know their value.
 */
typedef uint32_t jack_port_id_t;

typedef uint32_t jack_port_type_id_t;

/**
 * Prototype for the client supplied function that is called
 * by the engine anytime there is work to be done.
 *
 * @pre nframes == jack_get_buffer_size()
 * @pre nframes == pow(2,x)
 *
 * @param nframes number of frames to process
 * @param arg pointer to a client supplied structure
 *
 * @return zero on success, non-zero on error
 */
typedef int (*JackProcessCallback)(jack_nframes_t nframes, void *arg);

/**
 * Prototype for the client thread routine called
 * by the engine when the client is inserted in the graph.
 *
 * @param arg pointer to a client supplied structure
 *
 */
typedef void *(*JackThreadCallback)(void* arg);

/**
 * Prototype for the client supplied function that is called
 * once after the creation of the thread in which other
 * callbacks will be made. Special thread characteristics
 * can be set from this callback, for example. This is a
 * highly specialized callback and most clients will not
 * and should not use it.
 *
 * @param arg pointer to a client supplied structure
 *
 * @return void
 */
typedef void (*JackThreadInitCallback)(void *arg);

/**
 * Prototype for the client supplied function that is called
 * whenever the processing graph is reordered.
 *
 * @param arg pointer to a client supplied structure
 *
 * @return zero on success, non-zero on error
 */
typedef int (*JackGraphOrderCallback)(void *arg);

/**
 * Prototype for the client-supplied function that is called whenever
 * an xrun has occured.
 *
 * @see jack_get_xrun_delayed_usecs()
 *
 * @param arg pointer to a client supplied structure
 *
 * @return zero on success, non-zero on error
 */
typedef int (*JackXRunCallback)(void *arg);

/**
 * Prototype for the @a bufsize_callback that is invoked whenever the
 * JACK engine buffer size changes.  Although this function is called
 * in the JACK process thread, the normal process cycle is suspended
 * during its operation, causing a gap in the audio flow.  So, the @a
 * bufsize_callback can allocate storage, touch memory not previously
 * referenced, and perform other operations that are not realtime
 * safe.
 *
 * @param nframes buffer size
 * @param arg pointer supplied by jack_set_buffer_size_callback().
 *
 * @return zero on success, non-zero on error
 */
typedef int (*JackBufferSizeCallback)(jack_nframes_t nframes, void *arg);

/**
 * Prototype for the client supplied function that is called
 * when the engine sample rate changes.
 *
 * @param nframes new engine sample rate
 * @param arg pointer to a client supplied structure
 *
 * @return zero on success, non-zero on error
 */
typedef int (*JackSampleRateCallback)(jack_nframes_t nframes, void *arg);

/**
 * Prototype for the client supplied function that is called
 * whenever a port is registered or unregistered.
 *
 * @param arg pointer to a client supplied structure
 */
typedef void (*JackPortRegistrationCallback)(jack_port_id_t port, int, void *arg);

/**
 * Prototype for the client supplied function that is called
 * whenever a client is registered or unregistered.
 *
 * @param name a null-terminated string containing the client name
 * @param register non-zero if the client is being registered,
 *                     zero if the client is being unregistered
 * @param arg pointer to a client supplied structure
 */
typedef void (*JackClientRegistrationCallback)(const char* name, int val, void *arg);

/**
 * Prototype for the client supplied function that is called
 * whenever a port is connected or disconnected.
 *
 * @param a one of two ports connected or disconnected
 * @param b one of two ports connected or disconnected
 * @param connect non-zero if ports were connected
 *                    zero if ports were disconnected
 * @param arg pointer to a client supplied data
 */
typedef void (*JackPortConnectCallback)(jack_port_id_t a, jack_port_id_t b, int connect, void* arg);

/**
 * Prototype for the client supplied function that is called
 * whenever the port name has been changed.
 *
 * @param port the port that has been renamed
 * @param new_name the new name
 * @param arg pointer to a client supplied structure
 *
 * @return zero on success, non-zero on error
 */
typedef int (*JackPortRenameCallback)(jack_port_id_t port, const char* old_name, const char* new_name, void *arg);

/**
 * Prototype for the client supplied function that is called
 * whenever jackd starts or stops freewheeling.
 *
 * @param starting non-zero if we start starting to freewheel, zero otherwise
 * @param arg pointer to a client supplied structure
 */
typedef void (*JackFreewheelCallback)(int starting, void *arg);

/**
 * Prototype for the client supplied function that is called
 * whenever jackd is shutdown. Note that after server shutdown, 
 * the client pointer is *not* deallocated by libjack,
 * the application is responsible to properly use jack_client_close()
 * to release client ressources. Warning: jack_client_close() cannot be
 * safely used inside the shutdown callback and has to be called outside of
 * the callback context.
 *
 * @param arg pointer to a client supplied structure
 */
typedef void (*JackShutdownCallback)(void *arg);

/**
 * Used for the type argument of jack_port_register() for default
 * audio ports and midi ports.
 */
#define JACK_DEFAULT_AUDIO_TYPE "32 bit float mono audio"
#define JACK_DEFAULT_MIDI_TYPE "8 bit raw midi"

/**
 * For convenience, use this typedef if you want to be able to change
 * between float and double. You may want to typedef sample_t to
 * jack_default_audio_sample_t in your application.
 */
typedef float jack_default_audio_sample_t;

/**
 *  A port has a set of flags that are formed by AND-ing together the
 *  desired values from the list below. The flags "JackPortIsInput" and
 *  "JackPortIsOutput" are mutually exclusive and it is an error to use
 *  them both.
 */
enum JackPortFlags {

    /**
     * if JackPortIsInput is set, then the port can receive
     * data.
     */
    JackPortIsInput = 0x1,

    /**
     * if JackPortIsOutput is set, then data can be read from
     * the port.
     */
    JackPortIsOutput = 0x2,

    /**
     * if JackPortIsPhysical is set, then the port corresponds
     * to some kind of physical I/O connector.
     */
    JackPortIsPhysical = 0x4,

    /**
     * if JackPortCanMonitor is set, then a call to
     * jack_port_request_monitor() makes sense.
     *
     * Precisely what this means is dependent on the client. A typical
     * result of it being called with TRUE as the second argument is
     * that data that would be available from an output port (with
     * JackPortIsPhysical set) is sent to a physical output connector
     * as well, so that it can be heard/seen/whatever.
     *
     * Clients that do not control physical interfaces
     * should never create ports with this bit set.
     */
    JackPortCanMonitor = 0x8,

    /**
     * JackPortIsTerminal means:
     *
     *  for an input port: the data received by the port
     *                    will not be passed on or made
     *                     available at any other port
     *
     * for an output port: the data available at the port
     *                    does not originate from any other port
     *
     * Audio synthesizers, I/O hardware interface clients, HDR
     * systems are examples of clients that would set this flag for
     * their ports.
     */
    JackPortIsTerminal = 0x10,
    
    /**
     * JackPortIsActive means the port has been registered and the 
     * client is "active", that is jack_activate has been called
     * 
     * JackPortIsActive is on between jack_activate and jack_deactivate.
     */
    JackPortIsActive = 0x20
};

/**
 *  @ref jack_options_t bits
 */
enum JackOptions {

    /**
     * Null value to use when no option bits are needed.
     */
    JackNullOption = 0x00,

    /**
     * Do not automatically start the JACK server when it is not
     * already running.  This option is always selected if
     * \$JACK_NO_START_SERVER is defined in the calling process
     * environment.
     */
    JackNoStartServer = 0x01,

    /**
     * Use the exact client name requested.  Otherwise, JACK
     * automatically generates a unique one, if needed.
     */
    JackUseExactName = 0x02,

    /**
     * Open with optional <em>(char *) server_name</em> parameter.
     */
    JackServerName = 0x04,

    /**
     * Load internal client from optional <em>(char *)
     * load_name</em>.  Otherwise use the @a client_name.
     */
    JackLoadName = 0x08,

    /**
     * Pass optional <em>(char *) load_init</em> string to the
     * jack_initialize() entry point of an internal client.
     */
    JackLoadInit = 0x10,

     /**
      * pass a SessionID Token this allows the sessionmanager to identify the client again.
      */
    JackSessionID = 0x20
};

/** Valid options for opening an external client. */
#define JackOpenOptions (JackSessionID|JackServerName|JackNoStartServer|JackUseExactName)

/** Valid options for loading an internal client. */
#define JackLoadOptions (JackLoadInit|JackLoadName|JackUseExactName)

/**
 *  Options for several JACK operations, formed by OR-ing together the
 *  relevant @ref JackOptions bits.
 */
typedef enum JackOptions jack_options_t;

/**
 *  @ref jack_status_t bits
 */
enum JackStatus {

    /**
     * Overall operation failed.
     */
    JackFailure = 0x01,

    /**
     * The operation contained an invalid or unsupported option.
     */
    JackInvalidOption = 0x02,

    /**
     * The desired client name was not unique.  With the @ref
     * JackUseExactName option this situation is fatal.  Otherwise,
     * the name was modified by appending a dash and a two-digit
     * number in the range "-01" to "-99".  The
     * jack_get_client_name() function will return the exact string
     * that was used.  If the specified @a client_name plus these
     * extra characters would be too long, the open fails instead.
     */
    JackNameNotUnique = 0x04,

    /**
     * The JACK server was started as a result of this operation.
     * Otherwise, it was running already.  In either case the caller
     * is now connected to jackd, so there is no race condition.
     * When the server shuts down, the client will find out.
     */
    JackServerStarted = 0x08,

    /**
     * Unable to connect to the JACK server.
     */
    JackServerFailed = 0x10,

    /**
     * Communication error with the JACK server.
     */
    JackServerError = 0x20,

    /**
     * Requested client does not exist.
     */
    JackNoSuchClient = 0x40,

    /**
     * Unable to load internal client
     */
    JackLoadFailure = 0x80,

    /**
     * Unable to initialize client
     */
    JackInitFailure = 0x100,

    /**
     * Unable to access shared memory
     */
    JackShmFailure = 0x200,

    /**
     * Client's protocol version does not match
     */
    JackVersionError = 0x400,
    
    /**
     * Backend error
     */
    JackBackendError = 0x800,
    
    /**
     * Client zombified failure
     */
    JackClientZombie = 0x1000
};

/**
 *  Status word returned from several JACK operations, formed by
 *  OR-ing together the relevant @ref JackStatus bits.
 */
typedef enum JackStatus jack_status_t;

/**
 * Transport states.
 */
typedef enum {

    /* the order matters for binary compatibility */
    JackTransportStopped = 0,       /**< Transport halted */
    JackTransportRolling = 1,       /**< Transport playing */
    JackTransportLooping = 2,       /**< For OLD_TRANSPORT, now ignored */
    JackTransportStarting = 3,      /**< Waiting for sync ready */
    JackTransportNetStarting = 4,       /**< Waiting for sync ready on the network*/

} jack_transport_state_t;

typedef uint64_t jack_unique_t;         /**< Unique ID (opaque) */

/**
 * Optional struct jack_position_t fields.
 */
typedef enum {

    JackPositionBBT = 0x10,     /**< Bar, Beat, Tick */
    JackPositionTimecode = 0x20,        /**< External timecode */
    JackBBTFrameOffset =      0x40,     /**< Frame offset of BBT information */
    JackAudioVideoRatio =     0x80, /**< audio frames per video frame */
    JackVideoFrameOffset =   0x100  /**< frame offset of first video frame */
    
} jack_position_bits_t;

/** all valid position bits */
#define JACK_POSITION_MASK (JackPositionBBT|JackPositionTimecode)
#define EXTENDED_TIME_INFO

typedef struct {

    /* these four cannot be set from clients: the server sets them */
    jack_unique_t       unique_1;       /**< unique ID */
    jack_time_t         usecs;          /**< monotonic, free-rolling */
    jack_nframes_t      frame_rate;     /**< current frame rate (per second) */
    jack_nframes_t      frame;          /**< frame number, always present */

    jack_position_bits_t valid;         /**< which other fields are valid */

    /* JackPositionBBT fields: */
    int32_t             bar;            /**< current bar */
    int32_t             beat;           /**< current beat-within-bar */
    int32_t             tick;           /**< current tick-within-beat */
    double              bar_start_tick;

    float               beats_per_bar;  /**< time signature "numerator" */
    float               beat_type;      /**< time signature "denominator" */
    double              ticks_per_beat;
    double              beats_per_minute;

    /* JackPositionTimecode fields:     (EXPERIMENTAL: could change) */
    double              frame_time;     /**< current time in seconds */
    double              next_time;      /**< next sequential frame_time
                         (unless repositioned) */

    /* JackBBTFrameOffset fields: */
    jack_nframes_t      bbt_offset;     /**< frame offset for the BBT fields
                         (the given bar, beat, and tick
                         values actually refer to a time
                         frame_offset frames before the
                         start of the cycle), should
                         be assumed to be 0 if
                         JackBBTFrameOffset is not
                         set. If JackBBTFrameOffset is
                         set and this value is zero, the BBT
                         time refers to the first frame of this
                         cycle. If the value is positive,
                         the BBT time refers to a frame that
                         many frames before the start of the
                         cycle. */

    /* JACK video positional data (experimental) */

    float               audio_frames_per_video_frame; /**< number of audio frames
                         per video frame. Should be assumed
                         zero if JackAudioVideoRatio is not
                         set. If JackAudioVideoRatio is set
                         and the value is zero, no video
                         data exists within the JACK graph */

    jack_nframes_t      video_offset;   /**< audio frame at which the first video
                         frame in this cycle occurs. Should
                         be assumed to be 0 if JackVideoFrameOffset
                         is not set. If JackVideoFrameOffset is
                         set, but the value is zero, there is
                         no video frame within this cycle. */

    /* For binary compatibility, new fields should be allocated from
     * this padding area with new valid bits controlling access, so
     * the existing structure size and offsets are preserved. */
    int32_t             padding[7];

    /* When (unique_1 == unique_2) the contents are consistent. */
    jack_unique_t       unique_2;       /**< unique ID */

} jack_position_t;

/**
    * Prototype for the @a sync_callback defined by slow-sync clients.
    * When the client is active, this callback is invoked just before
    * process() in the same thread.  This occurs once after registration,
    * then subsequently whenever some client requests a new position, or
    * the transport enters the ::JackTransportStarting state.  This
    * realtime function must not wait.
    *
    * The transport @a state will be:
    *
    *   - ::JackTransportStopped when a new position is requested;
    *   - ::JackTransportStarting when the transport is waiting to start;
    *   - ::JackTransportRolling when the timeout has expired, and the
    *   position is now a moving target.
    *
    * @param state current transport state.
    * @param pos new transport position.
    * @param arg the argument supplied by jack_set_sync_callback().
    *
    * @return TRUE (non-zero) when ready to roll.
    */
typedef int (*JackSyncCallback)(jack_transport_state_t state,
                                jack_position_t *pos,
                                void *arg);


/**
  * Prototype for the @a timebase_callback used to provide extended
  * position information.  Its output affects all of the following
  * process cycle.  This realtime function must not wait.
  *
  * This function is called immediately after process() in the same
  * thread whenever the transport is rolling, or when any client has
  * requested a new position in the previous cycle.  The first cycle
  * after jack_set_timebase_callback() is also treated as a new
  * position, or the first cycle after jack_activate() if the client
  * had been inactive.
  *
  * The timebase master may not use its @a pos argument to set @a
  * pos->frame.  To change position, use jack_transport_reposition() or
  * jack_transport_locate().  These functions are realtime-safe, the @a
  * timebase_callback can call them directly.
  *
  * @param state current transport state.
  * @param nframes number of frames in current period.
  * @param pos address of the position structure for the next cycle; @a
  * pos->frame will be its frame number.  If @a new_pos is FALSE, this
  * structure contains extended position information from the current
  * cycle.  If TRUE, it contains whatever was set by the requester.
  * The @a timebase_callback's task is to update the extended
  * information here.
  * @param new_pos TRUE (non-zero) for a newly requested @a pos, or for
  * the first cycle after the @a timebase_callback is defined.
  * @param arg the argument supplied by jack_set_timebase_callback().
  */
typedef void (*JackTimebaseCallback)(jack_transport_state_t state,
                                     jack_nframes_t nframes,
                                     jack_position_t *pos,
                                     int new_pos,
                                     void *arg);

/*********************************************************************
    * The following interfaces are DEPRECATED.  They are only provided
    * for compatibility with the earlier JACK transport implementation.
    *********************************************************************/

/**
 * Optional struct jack_transport_info_t fields.
 *
 * @see jack_position_bits_t.
 */
typedef enum {

    JackTransportState = 0x1,   /**< Transport state */
    JackTransportPosition = 0x2,        /**< Frame number */
    JackTransportLoop = 0x4,    /**< Loop boundaries (ignored) */
    JackTransportSMPTE = 0x8,   /**< SMPTE (ignored) */
    JackTransportBBT = 0x10     /**< Bar, Beat, Tick */

} jack_transport_bits_t;

/**
 * Deprecated struct for transport position information.
 *
 * @deprecated This is for compatibility with the earlier transport
 * interface.  Use the jack_position_t struct, instead.
 */
typedef struct {

    /* these two cannot be set from clients: the server sets them */

    jack_nframes_t frame_rate;          /**< current frame rate (per second) */
    jack_time_t usecs;          /**< monotonic, free-rolling */

    jack_transport_bits_t valid;        /**< which fields are legal to read */
    jack_transport_state_t transport_state;
    jack_nframes_t frame;
    jack_nframes_t loop_start;
    jack_nframes_t loop_end;

    long smpte_offset;  /**< SMPTE offset (from frame 0) */
    float smpte_frame_rate;     /**< 29.97, 30, 24 etc. */

    int bar;
    int beat;
    int tick;
    double bar_start_tick;

    float beats_per_bar;
    float beat_type;
    double ticks_per_beat;
    double beats_per_minute;

} jack_transport_info_t;

/**
 * Prototype for the client supplied function that is called
 * whenever jackd is shutdown. Note that after server shutdown, 
 * the client pointer is *not* deallocated by libjack,
 * the application is responsible to properly use jack_client_close()
 * to release client ressources. Warning: jack_client_close() cannot be
 * safely used inside the shutdown callback and has to be called outside of
 * the callback context.
 
 * @param code a status word, formed by OR-ing together the relevant @ref JackStatus bits.
 * @param reason a string describing the shutdown reason (backend failure, server crash... etc...)
 * @param arg pointer to a client supplied structure
 */
typedef void (*JackInfoShutdownCallback)(jack_status_t code, const char* reason, void *arg);

#endif /* __jack_types_h__ */