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/* $OpenBSD: dev.h,v 1.8 2014/03/17 17:16:06 ratchov Exp $ */
/*
* Copyright (c) 2008-2012 Alexandre Ratchov <alex@caoua.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#ifndef DEV_H
#define DEV_H
#include "abuf.h"
#include "dsp.h"
#include "siofile.h"
/*
* audio stream state structure
*/
struct slotops
{
void (*onmove)(void *); /* clock tick */
void (*onvol)(void *, unsigned int); /* tell client vol changed */
void (*fill)(void *); /* request to fill a play block */
void (*flush)(void *); /* request to flush a rec block */
void (*eof)(void *); /* notify that play drained */
void (*exit)(void *); /* delete client */
};
struct slot {
struct slotops *ops; /* client callbacks */
struct slot *next; /* next on the play list */
struct dev *dev; /* device this belongs to */
void *arg; /* user data for callbacks */
struct aparams par; /* socket side params */
struct {
int weight; /* dynamic range */
int maxweight; /* max dynamic range allowed */
unsigned int vol; /* volume within the vol */
struct abuf buf; /* socket side buffer */
int bpf; /* byte per frame */
int slot_cmin, slot_cmax; /* slot source chans */
int dev_cmin, dev_cmax; /* device destination chans */
struct cmap cmap; /* channel mapper state */
struct resamp resamp; /* resampler state */
struct conv dec; /* format decoder params */
int join; /* channel join factor */
int expand; /* channel expand factor */
void *resampbuf, *decbuf; /* tmp buffers */
} mix;
struct {
struct abuf buf; /* socket side buffer */
int prime; /* initial cycles to skip */
int bpf; /* byte per frame */
int slot_cmin, slot_cmax; /* slot destination chans */
int dev_cmin, dev_cmax; /* device source chans */
struct cmap cmap; /* channel mapper state */
struct resamp resamp; /* buffer for resampling */
struct conv enc; /* buffer for encoding */
int join; /* channel join factor */
int expand; /* channel expand factor */
void *resampbuf, *encbuf; /* tmp buffers */
} sub;
int xrun; /* underrun policy */
int skip; /* cycles to skip (for xrun) */
int dup; /* mono-to-stereo and alike */
#define SLOT_BUFSZ(s) \
((s)->appbufsz + (s)->dev->bufsz / (s)->dev->round * (s)->round)
int appbufsz; /* slot-side buffer size */
int round; /* slot-side block size */
int rate; /* slot-side sample rate */
int delta; /* pending clock ticks */
int delta_rem; /* remainder for delta */
int mode; /* MODE_{PLAY,REC} */
#define SLOT_INIT 0 /* not trying to do anything */
#define SLOT_START 1 /* buffer allocated */
#define SLOT_READY 2 /* buffer filled enough */
#define SLOT_RUN 3 /* buffer attached to device */
#define SLOT_STOP 4 /* draining */
int pstate;
#define SLOT_NAMEMAX 8
char name[SLOT_NAMEMAX]; /* name matching [a-z]+ */
unsigned int unit; /* instance of name */
unsigned int serial; /* global unique number */
unsigned int vol; /* current (midi) volume */
unsigned int tstate; /* mmc state */
};
/*
* audio device with plenty of slots
*/
struct dev {
struct dev *next;
struct slot *slot_list; /* audio streams attached */
struct midi *midi;
/*
* audio device (while opened)
*/
struct dev_sio sio;
struct aparams par; /* encoding */
int pchan, rchan; /* play & rec channels */
adata_t *rbuf; /* rec buffer */
adata_t *pbuf; /* array of play buffers */
#define DEV_PBUF(d) ((d)->pbuf + (d)->poffs * (d)->pchan)
int poffs; /* index of current play buf */
int psize; /* size of play buffer */
struct conv enc; /* native->device format */
struct conv dec; /* device->native format */
unsigned char *encbuf; /* buffer for encoding */
unsigned char *decbuf; /* buffer for decoding */
/*
* preallocated audio sub-devices
*/
#define DEV_NSLOT 8
struct slot slot[DEV_NSLOT];
unsigned int serial; /* for slot allocation */
/*
* current position, relative to the current cycle
*/
int delta;
/*
* desired parameters
*/
unsigned int reqmode; /* mode */
struct aparams reqpar; /* parameters */
int reqpchan, reqrchan; /* play & rec chans */
unsigned int reqbufsz; /* buffer size */
unsigned int reqround; /* block size */
unsigned int reqrate; /* sample rate */
unsigned int hold; /* hold the device open ? */
unsigned int autovol; /* auto adjust playvol ? */
unsigned int refcnt; /* number of openers */
#define DEV_NMAX 16 /* max number of devices */
unsigned int num; /* device serial number */
#define DEV_CFG 0 /* closed */
#define DEV_INIT 1 /* stopped */
#define DEV_RUN 2 /* playin & recording */
unsigned int pstate; /* one of above */
char *path; /* sio path */
/*
* actual parameters and runtime state (i.e. once opened)
*/
unsigned int mode; /* bitmap of MODE_xxx */
unsigned int bufsz, round, rate;
unsigned int prime;
/*
* MIDI time code (MTC)
*/
struct {
unsigned int origin; /* MTC start time */
unsigned int fps; /* MTC frames per second */
#define MTC_FPS_24 0
#define MTC_FPS_25 1
#define MTC_FPS_30 3
unsigned int fps_id; /* one of above */
unsigned int hr; /* MTC hours */
unsigned int min; /* MTC minutes */
unsigned int sec; /* MTC seconds */
unsigned int fr; /* MTC frames */
unsigned int qfr; /* MTC quarter frames */
int delta; /* rel. to the last MTC tick */
int refs;
} mtc;
/*
* MIDI machine control (MMC)
*/
#define MMC_OFF 0 /* ignore MMC messages */
#define MMC_STOP 1 /* stopped, can't start */
#define MMC_START 2 /* attempting to start */
#define MMC_RUN 3 /* started */
unsigned int tstate; /* one of above */
unsigned int master; /* master volume controller */
};
extern struct dev *dev_list;
void dev_log(struct dev *);
void dev_close(struct dev *);
struct dev *dev_new(char *, struct aparams *, unsigned int, unsigned int,
unsigned int, unsigned int, unsigned int, unsigned int);
struct dev *dev_bynum(int);
void dev_del(struct dev *);
void dev_adjpar(struct dev *, int, int, int, int, int);
int dev_init(struct dev *);
void dev_done(struct dev *);
int dev_getpos(struct dev *);
unsigned int dev_roundof(struct dev *, unsigned int);
/*
* interface to hardware device
*/
void dev_onmove(struct dev *, int);
void dev_cycle(struct dev *);
/*
* midi & midi call-backs
*/
void dev_mmcstart(struct dev *);
void dev_mmcstop(struct dev *);
void dev_mmcloc(struct dev *, unsigned int);
void dev_master(struct dev *, unsigned int);
void dev_midi_vol(struct dev *, struct slot *);
/*
* sio_open(3) like interface for clients
*/
void slot_log(struct slot *);
struct slot *slot_new(struct dev *, char *, struct slotops *, void *, int);
void slot_del(struct slot *);
void slot_setvol(struct slot *, unsigned int);
void slot_start(struct slot *);
void slot_stop(struct slot *);
void slot_read(struct slot *);
void slot_write(struct slot *);
#endif /* !defined(DEV_H) */
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