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/* $OpenBSD: aproc.h,v 1.30 2010/04/03 17:40:33 ratchov Exp $ */
/*
* Copyright (c) 2008 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 APROC_H
#define APROC_H
#include <sys/queue.h>
#include "aparams.h"
#include "file.h"
struct abuf;
struct aproc;
struct file;
struct aproc_ops {
/*
* Name of the ops structure, ie type of the unit.
*/
char *name;
/*
* The state of the given input abuf changed (eg. an input block
* is ready for processing). This function must get the block
* from the input, process it and remove it from the buffer.
*
* Processing the block will result in a change of the state of
* OTHER buffers that are attached to the aproc (eg. the output
* buffer was filled), thus this routine MUST notify ALL aproc
* structures that are waiting on it; most of the time this
* means just calling abuf_flush() on the output buffer.
*/
int (*in)(struct aproc *, struct abuf *);
/*
* The state of the given output abuf changed (eg. space for a
* new output block was made available) so processing can
* continue. This function must process more input in order to
* fill the output block.
*
* Producing a block will result in the change of the state of
* OTHER buffers that are attached to the aproc, thus this
* routine MUST notify ALL aproc structures that are waiting on
* it; most of the time this means calling abuf_fill() on the
* source buffers.
*
* Before filling input buffers (using abuf_fill()), this
* routine must ALWAYS check for eof condition, and if needed,
* handle it appropriately and call abuf_hup() to free the input
* buffer.
*/
int (*out)(struct aproc *, struct abuf *);
/*
* The input buffer is empty and we can no more receive data
* from it. The buffer will be destroyed as soon as this call
* returns so the abuf pointer will stop being valid after this
* call returns. There's no need to drain the buffer because the
* in() call-back was just called before.
*
* If this call reads and/or writes data on other buffers,
* abuf_flush() and abuf_fill() must be called appropriately.
*/
void (*eof)(struct aproc *, struct abuf *);
/*
* The output buffer can no more accept data (it should be
* considered as full). After this function returns, it will be
* destroyed and the "abuf" pointer will be no more valid.
*/
void (*hup)(struct aproc *, struct abuf *);
/*
* A new input was connected.
*/
void (*newin)(struct aproc *, struct abuf *);
/*
* A new output was connected
*/
void (*newout)(struct aproc *, struct abuf *);
/*
* Real-time record position changed (for input buffer),
* by the given amount of _frames_.
*/
void (*ipos)(struct aproc *, struct abuf *, int);
/*
* Real-time play position changed (for output buffer),
* by the given amount of _frames_.
*/
void (*opos)(struct aproc *, struct abuf *, int);
/*
* Destroy the aproc, called just before to free the
* aproc structure.
*/
void (*done)(struct aproc *);
};
/*
* The aproc structure represents a simple audio processing unit; they are
* interconnected by abuf structures and form a kind of "circuit". The circuit
* cannot have loops.
*/
struct aproc {
char *name; /* for debug purposes */
struct aproc_ops *ops; /* call-backs */
LIST_HEAD(, abuf) ibuflist; /* list of inputs */
LIST_HEAD(, abuf) obuflist; /* list of outputs */
unsigned refs; /* extern references */
#define APROC_ZOMB 1 /* destroyed but not freed */
#define APROC_QUIT 2 /* try to terminate if unused */
#define APROC_DROP 4 /* xrun if capable */
unsigned flags;
union { /* follow type-specific data */
struct { /* file/device io */
struct file *file; /* file to read/write */
unsigned partial; /* bytes of partial frame */
} io;
struct {
unsigned idle; /* frames since idleing */
unsigned round; /* block size, for xruns */
int lat; /* current latency */
int maxlat; /* max latency allowed */
unsigned abspos; /* frames produced */
struct aproc *ctl; /* MIDI control/sync */
struct aproc *mon; /* snoop output */
} mix;
struct {
unsigned idle; /* frames since idleing */
unsigned round; /* block size, for xruns */
int lat; /* current latency */
int maxlat; /* max latency allowed */
unsigned abspos; /* frames consumed */
struct aproc *ctl;
} sub;
struct {
int delta; /* time position */
unsigned bufsz; /* buffer size (latency) */
unsigned pending; /* uncommited samples */
} mon;
struct {
#define RESAMP_NCTX 2
unsigned ctx_start;
short ctx[NCHAN_MAX * RESAMP_NCTX];
unsigned iblksz, oblksz;
int diff;
int idelta, odelta; /* remainder of resamp_xpos */
} resamp;
struct {
short ctx[NCHAN_MAX];
} cmap;
struct {
int bfirst; /* bytes to skip at startup */
unsigned bps; /* bytes per sample */
unsigned shift; /* shift to get 32bit MSB */
int sigbit; /* sign bits to XOR */
int bnext; /* to reach the next byte */
int snext; /* to reach the next sample */
} conv;
struct {
struct abuf *owner; /* current input stream */
struct timo timo; /* timout for throtteling */
} thru;
struct {
#define CTL_NSLOT 8
#define CTL_NAMEMAX 8
unsigned serial;
#define CTL_OFF 0 /* ignore MMC messages */
#define CTL_STOP 1 /* stopped, can't start */
#define CTL_START 2 /* attempting to start */
#define CTL_RUN 3 /* started */
unsigned tstate;
unsigned origin; /* MTC start time */
unsigned fps; /* MTC frames per second */
#define MTC_FPS_24 0
#define MTC_FPS_25 1
#define MTC_FPS_30 3
unsigned fps_id; /* one of above */
unsigned hr; /* MTC hours */
unsigned min; /* MTC minutes */
unsigned sec; /* MTC seconds */
unsigned fr; /* MTC frames */
unsigned qfr; /* MTC quarter frames */
int delta; /* rel. to the last MTC tick */
struct ctl_slot {
struct ctl_ops {
void (*vol)(void *, unsigned);
void (*start)(void *);
void (*stop)(void *);
void (*loc)(void *, unsigned);
} *ops;
void *arg;
unsigned unit;
char name[CTL_NAMEMAX];
unsigned serial;
unsigned vol;
unsigned tstate;
} slot[CTL_NSLOT];
} ctl;
} u;
};
/*
* Check if the given pointer is a valid aproc structure.
*
* aproc structures are not free()'d immediately, because
* there may be pointers to them, instead the APROC_ZOMB flag
* is set which means that they should not be used. When
* aprocs reference counter reaches zero, they are actually
* freed
*/
#define APROC_OK(p) ((p) && !((p)->flags & APROC_ZOMB))
struct aproc *aproc_new(struct aproc_ops *, char *);
void aproc_del(struct aproc *);
void aproc_dbg(struct aproc *);
void aproc_setin(struct aproc *, struct abuf *);
void aproc_setout(struct aproc *, struct abuf *);
int aproc_depend(struct aproc *, struct aproc *);
void aproc_ipos(struct aproc *, struct abuf *, int);
void aproc_opos(struct aproc *, struct abuf *, int);
struct aproc *rfile_new(struct file *);
struct aproc *wfile_new(struct file *);
struct aproc *mix_new(char *, int, unsigned, struct aproc *);
struct aproc *sub_new(char *, int, unsigned, struct aproc *);
struct aproc *resamp_new(char *, unsigned, unsigned);
struct aproc *cmap_new(char *, struct aparams *, struct aparams *);
struct aproc *enc_new(char *, struct aparams *);
struct aproc *dec_new(char *, struct aparams *);
struct aproc *mon_new(char *, unsigned);
int rfile_in(struct aproc *, struct abuf *);
int rfile_out(struct aproc *, struct abuf *);
void rfile_eof(struct aproc *, struct abuf *);
void rfile_hup(struct aproc *, struct abuf *);
void rfile_done(struct aproc *);
int rfile_do(struct aproc *, unsigned, unsigned *);
int wfile_in(struct aproc *, struct abuf *);
int wfile_out(struct aproc *, struct abuf *);
void wfile_eof(struct aproc *, struct abuf *);
void wfile_hup(struct aproc *, struct abuf *);
void wfile_done(struct aproc *);
int wfile_do(struct aproc *, unsigned, unsigned *);
void mix_setmaster(struct aproc *);
void mix_clear(struct aproc *);
void mix_prime(struct aproc *);
void mix_drop(struct abuf *, int);
void sub_silence(struct abuf *, int);
void sub_clear(struct aproc *);
void mon_snoop(struct aproc *, struct abuf *, unsigned, unsigned);
void mon_clear(struct aproc *);
#endif /* !defined(APROC_H) */
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