transport.h

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/*
    Copyright (C) 2002 Paul Davis
    Copyright (C) 2003 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_transport_h__
#define __jack_transport_h__

#ifdef __cplusplus
extern "C" {
#endif

#include <jack/types.h>

#ifndef 
#ifdef __GNUC__
/*  needs to be a macro which
   expands into a compiler directive. The directive must
   tell the compiler to arrange the preceding structure
   declaration so that it is packed on byte-boundaries rather 
   than use the natural alignment of the processor and/or
   compiler.
*/
#define  __attribute__((__packed__))
#else
/* Add other things here for non-gcc platforms */
#endif
#endif


typedef enum {

        /* the order matters for binary compatibility */
        JackTransportStopped = 0,       
        JackTransportRolling = 1,       
        JackTransportLooping = 2,       
        JackTransportStarting = 3       
} jack_transport_state_t;

typedef uint64_t jack_unique_t;         
typedef enum {

        JackPositionBBT =         0x10, 
        JackPositionTimecode =    0x20, 
        JackBBTFrameOffset =      0x40, 
        JackAudioVideoRatio =     0x80, 
        JackVideoFrameOffset =   0x100  
} jack_position_bits_t;

#define JACK_POSITION_MASK (JackPositionBBT|JackPositionTimecode|JackBBTFrameOffset|JackAudioVideoRatio|JackVideoFrameOffset)
#define EXTENDED_TIME_INFO

typedef struct {
    
    /* these four cannot be set from clients: the server sets them */
    jack_unique_t       unique_1;       
    jack_time_t         usecs;          
    jack_nframes_t      frame_rate;     
    jack_nframes_t      frame;          
    jack_position_bits_t valid;         
    /* JackPositionBBT fields: */
    int32_t             bar;            
    int32_t             beat;           
    int32_t             tick;           
    double              bar_start_tick;            

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

    /* JackPositionTimecode fields:     (EXPERIMENTAL: could change) */
    double              frame_time;     
    double              next_time;      
    /* JackBBTFrameOffset fields: */
    jack_nframes_t      bbt_offset;     
    /* JACK video positional data (experimental) */

    float               audio_frames_per_video_frame; 
    jack_nframes_t      video_offset;   
    /* 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;       
}  jack_position_t;

int  jack_release_timebase (jack_client_t *client);

typedef int  (*JackSyncCallback)(jack_transport_state_t state,
                                 jack_position_t *pos,
                                 void *arg);

int  jack_set_sync_callback (jack_client_t *client,
                             JackSyncCallback sync_callback,
                             void *arg);

int  jack_set_sync_timeout (jack_client_t *client,
                            jack_time_t timeout);

typedef void (*JackTimebaseCallback)(jack_transport_state_t state,
                                     jack_nframes_t nframes, 
                                     jack_position_t *pos,
                                     int new_pos,
                                     void *arg);

int  jack_set_timebase_callback (jack_client_t *client,
                                 int conditional,
                                 JackTimebaseCallback timebase_callback,
                                 void *arg);

int  jack_transport_locate (jack_client_t *client,
                            jack_nframes_t frame);

jack_transport_state_t jack_transport_query (const jack_client_t *client,
                                             jack_position_t *pos);

jack_nframes_t jack_get_current_transport_frame (const jack_client_t *client);
                                                 
int  jack_transport_reposition (jack_client_t *client,
                                jack_position_t *pos);

void jack_transport_start (jack_client_t *client);

void jack_transport_stop (jack_client_t *client);

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

typedef enum {

        JackTransportState =    0x1,    
        JackTransportPosition = 0x2,    
        JackTransportLoop =     0x4,    
        JackTransportSMPTE =    0x8,    
        JackTransportBBT =      0x10    
} jack_transport_bits_t;

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

    jack_nframes_t frame_rate;          
    jack_time_t    usecs;               
    jack_transport_bits_t  valid;       
    jack_transport_state_t transport_state;         
    jack_nframes_t         frame;
    jack_nframes_t         loop_start;
    jack_nframes_t         loop_end;

    long           smpte_offset;        
    float          smpte_frame_rate;    
    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;
        
void jack_get_transport_info (jack_client_t *client,
                              jack_transport_info_t *tinfo);

void jack_set_transport_info (jack_client_t *client,
                              jack_transport_info_t *tinfo);

#ifdef __cplusplus
}
#endif

#endif /* __jack_transport_h__ */

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