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sndio/aucat/dev.c

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/* $OpenBSD: dev.c,v 1.63 2010/07/31 08:46:56 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.
*/
/*
* Device abstraction module
*
* This module exposes a ``enhanced device'' that uses aproc
* structures framework; it does conversions on the fly and can
* handle multiple streams. The enhanced device starts and stops
* automatically, when streams are attached, and provides
* primitives for MIDI control
*
* From the main loop, the device is used as follows:
*
* 1. create the device using dev_new_xxx()
* 2. call dev_run() in the event loop
* 3. destroy the device using dev_del()
* 4. continue running the event loop to drain
*
* The device is used as follows from aproc context:
*
* 1. open the device with dev_ref()
* 2. negociate parameters (mode, rate, ...)
* 3. create your stream (ie allocate and fill abufs)
* 4. attach your stream atomically:
* - first call dev_wakeup() to ensure device is not suspended
* - possibly fetch dynamic parameters (eg. dev_getpos())
* - attach your buffers with dev_attach()
* 5. close your stream, ie abuf_eof() or abuf_hup()
* 6. close the device with dev_unref()
*
* The device has the following states:
*
* CLOSED sio_open() is not called, it's not ready and
* no streams can be attached; dev_ref() must
* be called to open the device
*
* INIT device is opened, processing chain is ready, but
* DMA is not started yet. Streams can attach,
* in which case device will automatically switch
* to the START state
*
* START at least one stream is attached, play buffers
* are primed (if necessary) DMA is ready and
* will start immeadiately (next cycle)
*
* RUN DMA is started. New streams can attach. If the
* device is idle (all streams are closed and
* finished draining), then the device
* automatically switches to INIT or CLOSED
*/
/*
* TODO:
*
* priming buffer is not ok, because it will insert silence and
* break synchronization to other programs.
*
* priming buffer in server mode is required, because f->bufsz may
* be smaller than the server buffer and may cause underrun in the
* dev_bufsz part of the buffer, in turn causing apps to break. It
* doesn't hurt because we care only in synchronization between
* clients.
*
* Priming is not required in non-server mode, because streams
* actually start when they are in the READY state, and their
* buffer is large enough to never cause underruns of dev_bufsz.
*
* Fix sock.c to allocate dev_bufsz, but to use only appbufsz --
* or whatever -- but to avoid underruns in dev_bufsz. Then remove
* this ugly hack.
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include "abuf.h"
#include "aproc.h"
#include "conf.h"
#include "dev.h"
#include "pipe.h"
#include "miofile.h"
#include "siofile.h"
#include "midi.h"
#include "opt.h"
#ifdef DEBUG
#include "dbg.h"
#endif
int dev_open(struct dev *);
void dev_close(struct dev *);
void dev_start(struct dev *);
void dev_stop(struct dev *);
void dev_clear(struct dev *);
struct dev *dev_list = NULL;
/*
* Create a sndio device
*/
struct dev *
dev_new_sio(char *path,
unsigned mode, struct aparams *dipar, struct aparams *dopar,
unsigned bufsz, unsigned round, unsigned hold)
{
struct dev *d;
d = malloc(sizeof(struct dev));
if (d == NULL) {
perror("malloc");
exit(1);
}
d->path = path;
d->reqmode = mode;
if (mode & MODE_PLAY)
d->reqopar = *dopar;
if (mode & MODE_RECMASK)
d->reqipar = *dipar;
d->reqbufsz = bufsz;
d->reqround = round;
d->hold = hold;
d->pstate = DEV_CLOSED;
d->next = dev_list;
dev_list = d;
if (d->hold && !dev_open(d)) {
dev_del(d);
return NULL;
}
return d;
}
/*
* Create a loopback synchronous device
*/
struct dev *
dev_new_loop(struct aparams *dipar, struct aparams *dopar, unsigned bufsz)
{
struct aparams par;
unsigned cmin, cmax, rate;
struct dev *d;
d = malloc(sizeof(struct dev));
if (d == NULL) {
perror("malloc");
exit(1);
}
cmin = (dipar->cmin < dopar->cmin) ? dipar->cmin : dopar->cmin;
cmax = (dipar->cmax > dopar->cmax) ? dipar->cmax : dopar->cmax;
rate = (dipar->rate > dopar->rate) ? dipar->rate : dopar->rate;
aparams_init(&par, cmin, cmax, rate);
d->reqipar = par;
d->reqopar = par;
d->rate = rate;
d->reqround = (bufsz + 1) / 2;
d->reqbufsz = d->reqround * 2;
d->reqmode = MODE_PLAY | MODE_REC | MODE_LOOP;
d->pstate = DEV_CLOSED;
d->hold = 0;
d->path = "loop";
d->next = dev_list;
dev_list = d;
return d;
}
/*
* Create a MIDI thru box device
*/
struct dev *
dev_new_thru(void)
{
struct dev *d;
d = malloc(sizeof(struct dev));
if (d == NULL) {
perror("malloc");
exit(1);
}
d->reqmode = 0;
d->pstate = DEV_CLOSED;
d->hold = 0;
d->path = "midithru";
d->next = dev_list;
dev_list = d;
return d;
}
/*
* Open the device with the dev_reqxxx capabilities. Setup a mixer, demuxer,
* monitor, midi control, and any necessary conversions.
*/
int
dev_open(struct dev *d)
{
struct file *f;
struct aparams par;
struct aproc *conv;
struct abuf *buf;
unsigned siomode;
d->mode = d->reqmode;
d->round = d->reqround;
d->bufsz = d->reqbufsz;
d->ipar = d->reqipar;
d->opar = d->reqopar;
d->rec = NULL;
d->play = NULL;
d->mon = NULL;
d->mix = NULL;
d->sub = NULL;
d->submon = NULL;
d->midi = NULL;
d->rate = 0;
/*
* If needed, open the device (ie create dev_rec and dev_play)
*/
if ((d->mode & (MODE_PLAY | MODE_REC)) && !(d->mode & MODE_LOOP)) {
siomode = d->mode & (MODE_PLAY | MODE_REC);
f = (struct file *)siofile_new(&siofile_ops,
d->path,
&siomode,
&d->ipar,
&d->opar,
&d->bufsz,
&d->round);
if (f == NULL) {
#ifdef DEBUG
if (debug_level >= 1) {
dbg_puts(d->path);
dbg_puts(": failed to open audio device\n");
}
#endif
return 0;
}
if (!(siomode & MODE_PLAY))
d->mode &= ~(MODE_PLAY | MODE_MON);
if (!(siomode & MODE_REC))
d->mode &= ~MODE_REC;
if ((d->mode & (MODE_PLAY | MODE_REC)) == 0) {
#ifdef DEBUG
if (debug_level >= 1) {
dbg_puts(d->path);
dbg_puts(": mode not supported by device\n");
}
#endif
return 0;
}
d->rate = d->mode & MODE_REC ? d->ipar.rate : d->opar.rate;
#ifdef DEBUG
if (debug_level >= 2) {
if (d->mode & MODE_REC) {
dbg_puts(d->path);
dbg_puts(": recording ");
aparams_dbg(&d->ipar);
dbg_puts("\n");
}
if (d->mode & MODE_PLAY) {
dbg_puts(d->path);
dbg_puts(": playing ");
aparams_dbg(&d->opar);
dbg_puts("\n");
}
}
#endif
if (d->mode & MODE_REC) {
d->rec = rsio_new(f);
d->rec->refs++;
}
if (d->mode & MODE_PLAY) {
d->play = wsio_new(f);
d->play->refs++;
}
}
/*
* Create the midi control end, or a simple thru box
* if there's no device
*/
d->midi = (d->mode == 0) ? thru_new("thru") : ctl_new("ctl", d);
d->midi->refs++;
/*
* Create mixer, demuxer and monitor
*/
if (d->mode & MODE_PLAY) {
d->mix = mix_new("play", d->bufsz, d->round);
d->mix->refs++;
d->mix->u.mix.ctl = d->midi;
}
if (d->mode & MODE_REC) {
d->sub = sub_new("rec", d->bufsz, d->round);
d->sub->refs++;
/*
* If not playing, use the record end as clock source
*/
if (!(d->mode & MODE_PLAY))
d->sub->u.sub.ctl = d->midi;
}
if (d->mode & MODE_LOOP) {
/*
* connect mixer out to demuxer in
*/
buf = abuf_new(d->bufsz, &d->opar);
aproc_setout(d->mix, buf);
aproc_setin(d->sub, buf);
d->mix->flags |= APROC_QUIT;
d->sub->flags |= APROC_QUIT;
d->rate = d->opar.rate;
}
if (d->rec) {
aparams_init(&par, d->ipar.cmin, d->ipar.cmax, d->rate);
/*
* Create device <-> demuxer buffer
*/
buf = abuf_new(d->bufsz, &d->ipar);
aproc_setout(d->rec, buf);
/*
* Insert a converter, if needed.
*/
if (!aparams_eqenc(&d->ipar, &par)) {
conv = dec_new("rec", &d->ipar);
aproc_setin(conv, buf);
buf = abuf_new(d->round, &par);
aproc_setout(conv, buf);
}
d->ipar = par;
aproc_setin(d->sub, buf);
}
if (d->play) {
aparams_init(&par, d->opar.cmin, d->opar.cmax, d->rate);
/*
* Create device <-> mixer buffer
*/
buf = abuf_new(d->bufsz, &d->opar);
aproc_setin(d->play, buf);
/*
* Append a converter, if needed.
*/
if (!aparams_eqenc(&par, &d->opar)) {
conv = enc_new("play", &d->opar);
aproc_setout(conv, buf);
buf = abuf_new(d->round, &par);
aproc_setin(conv, buf);
}
d->opar = par;
aproc_setout(d->mix, buf);
}
if (d->mode & MODE_MON) {
d->mon = mon_new("mon", d->bufsz);
d->mon->refs++;
buf = abuf_new(d->bufsz, &d->opar);
aproc_setout(d->mon, buf);
/*
* Append a "sub" to which clients will connect.
*/
d->submon = sub_new("mon", d->bufsz, d->round);
d->submon->refs++;
aproc_setin(d->submon, buf);
/*
* Attach to the mixer
*/
d->mix->u.mix.mon = d->mon;
d->mon->refs++;
}
#ifdef DEBUG
if (debug_level >= 2) {
if (d->mode & (MODE_PLAY | MODE_RECMASK)) {
dbg_puts(d->path);
dbg_puts(": block size is ");
dbg_putu(d->round);
dbg_puts(" frames, using ");
dbg_putu(d->bufsz / d->round);
dbg_puts(" blocks\n");
}
}
#endif
d->pstate = DEV_INIT;
return 1;
}
/*
* Cleanly stop and drain everything and close the device
* once both play chain and record chain are gone.
*/
void
dev_close(struct dev *d)
{
struct file *f;
/*
* if the device is starting, ensure it actually starts
* so buffers are drained, else clear any buffers
*/
switch (d->pstate) {
case DEV_START:
#ifdef DEBUG
if (debug_level >= 3)
dbg_puts("draining device\n");
#endif
dev_start(d);
break;
case DEV_INIT:
#ifdef DEBUG
if (debug_level >= 3)
dbg_puts("flushing device\n");
#endif
dev_clear(d);
break;
}
#ifdef DEBUG
if (debug_level >= 2)
dbg_puts("closing device\n");
#endif
if (d->mix) {
/*
* Put the mixer in ``autoquit'' state and generate
* EOF on all inputs connected it. Once buffers are
* drained the mixer will terminate and shutdown the
* device.
*
* NOTE: since file_eof() can destroy the file and
* reorder the file_list, we have to restart the loop
* after each call to file_eof().
*/
if (APROC_OK(d->mix))
mix_quit(d->mix);
/*
* XXX: handle this in mix_done()
*/
if (APROC_OK(d->mix->u.mix.mon)) {
d->mix->u.mix.mon->refs--;
aproc_del(d->mix->u.mix.mon);
d->mix->u.mix.mon = NULL;
}
restart_mix:
LIST_FOREACH(f, &file_list, entry) {
if (f->rproc != NULL &&
aproc_depend(d->mix, f->rproc)) {
file_eof(f);
goto restart_mix;
}
}
} else if (d->sub) {
/*
* Same as above, but since there's no mixer,
* we generate EOF on the record-end of the
* device.
*/
restart_sub:
LIST_FOREACH(f, &file_list, entry) {
if (f->rproc != NULL &&
aproc_depend(d->sub, f->rproc)) {
file_eof(f);
goto restart_sub;
}
}
} else if (d->submon) {
/*
* Same as above
*/
restart_submon:
LIST_FOREACH(f, &file_list, entry) {
if (f->rproc != NULL &&
aproc_depend(d->submon, f->rproc)) {
file_eof(f);
goto restart_submon;
}
}
}
if (d->midi) {
d->midi->flags |= APROC_QUIT;
if (LIST_EMPTY(&d->midi->ins))
aproc_del(d->midi);
restart_midi:
LIST_FOREACH(f, &file_list, entry) {
if (f->rproc &&
aproc_depend(d->midi, f->rproc)) {
file_eof(f);
goto restart_midi;
}
}
}
if (d->mix) {
if (--d->mix->refs == 0 && (d->mix->flags & APROC_ZOMB))
aproc_del(d->mix);
d->mix = NULL;
}
if (d->play) {
if (--d->play->refs == 0 && (d->play->flags & APROC_ZOMB))
aproc_del(d->play);
d->play = NULL;
}
if (d->sub) {
if (--d->sub->refs == 0 && (d->sub->flags & APROC_ZOMB))
aproc_del(d->sub);
d->sub = NULL;
}
if (d->rec) {
if (--d->rec->refs == 0 && (d->rec->flags & APROC_ZOMB))
aproc_del(d->rec);
d->rec = NULL;
}
if (d->submon) {
if (--d->submon->refs == 0 && (d->submon->flags & APROC_ZOMB))
aproc_del(d->submon);
d->submon = NULL;
}
if (d->mon) {
if (--d->mon->refs == 0 && (d->mon->flags & APROC_ZOMB))
aproc_del(d->mon);
d->mon = NULL;
}
if (d->midi) {
if (--d->midi->refs == 0 && (d->midi->flags & APROC_ZOMB))
aproc_del(d->midi);
d->midi = NULL;
}
d->pstate = DEV_CLOSED;
}
/*
* Unless the device is already in process of closing, request it to close
*/
void
dev_drain(struct dev *d)
{
if (d->pstate != DEV_CLOSED)
dev_close(d);
}
/*
* Free the device
*/
void
dev_del(struct dev *d)
{
struct dev **p;
dev_drain(d);
for (p = &dev_list; *p != d; p = &(*p)->next) {
#ifdef DEBUG
if (*p == NULL) {
dbg_puts("device to delete not on the list\n");
dbg_panic();
}
#endif
}
*p = d->next;
free(d);
}
/*
* Open a MIDI device and connect it to the thru box
*/
int
dev_thruadd(struct dev *d, char *name, int in, int out)
{
struct file *f;
struct abuf *rbuf = NULL, *wbuf = NULL;
struct aproc *rproc, *wproc;
if (!dev_ref(d))
return 0;
f = (struct file *)miofile_new(&miofile_ops, name, in, out);
if (f == NULL)
return 0;
if (in) {
rproc = rfile_new(f);
rbuf = abuf_new(MIDI_BUFSZ, &aparams_none);
aproc_setout(rproc, rbuf);
}
if (out) {
wproc = wfile_new(f);
wbuf = abuf_new(MIDI_BUFSZ, &aparams_none);
aproc_setin(wproc, wbuf);
}
dev_midiattach(d, rbuf, wbuf);
return 1;
}
/*
* Attach a bi-directional MIDI stream to the MIDI device
*/
void
dev_midiattach(struct dev *d, struct abuf *ibuf, struct abuf *obuf)
{
if (ibuf)
aproc_setin(d->midi, ibuf);
if (obuf) {
aproc_setout(d->midi, obuf);
if (ibuf) {
ibuf->duplex = obuf;
obuf->duplex = ibuf;
}
}
}
unsigned
dev_roundof(struct dev *d, unsigned newrate)
{
return (d->round * newrate + d->rate / 2) / d->rate;
}
/*
* Start the (paused) device. By default it's paused.
*/
void
dev_start(struct dev *d)
{
struct file *f;
#ifdef DEBUG
if (debug_level >= 2)
dbg_puts("starting device\n");
#endif
d->pstate = DEV_RUN;
if (d->mode & MODE_LOOP)
return;
if (APROC_OK(d->mix))
d->mix->flags |= APROC_DROP;
if (APROC_OK(d->sub))
d->sub->flags |= APROC_DROP;
if (APROC_OK(d->submon))
d->submon->flags |= APROC_DROP;
if (APROC_OK(d->play) && d->play->u.io.file) {
f = d->play->u.io.file;
f->ops->start(f);
} else if (APROC_OK(d->rec) && d->rec->u.io.file) {
f = d->rec->u.io.file;
f->ops->start(f);
}
}
/*
* Pause the device. This may trigger context switches,
* so it shouldn't be called from aproc methods
*/
void
dev_stop(struct dev *d)
{
struct file *f;
#ifdef DEBUG
if (debug_level >= 2)
dbg_puts("device stopped\n");
#endif
d->pstate = DEV_INIT;
if (d->mode & MODE_LOOP)
return;
if (APROC_OK(d->play) && d->play->u.io.file) {
f = d->play->u.io.file;
f->ops->stop(f);
} else if (APROC_OK(d->rec) && d->rec->u.io.file) {
f = d->rec->u.io.file;
f->ops->stop(f);
}
if (APROC_OK(d->mix))
d->mix->flags &= ~APROC_DROP;
if (APROC_OK(d->sub))
d->sub->flags &= ~APROC_DROP;
if (APROC_OK(d->submon))
d->submon->flags &= ~APROC_DROP;
}
int
dev_ref(struct dev *d)
{
#ifdef DEBUG
if (debug_level >= 3)
dbg_puts("device requested\n");
#endif
if (d->pstate == DEV_CLOSED && !dev_open(d)) {
if (d->hold)
dev_del(d);
return 0;
}
d->refcnt++;
return 1;
}
void
dev_unref(struct dev *d)
{
#ifdef DEBUG
if (debug_level >= 3)
dbg_puts("device released\n");
#endif
d->refcnt--;
if (d->refcnt == 0 && d->pstate == DEV_INIT && !d->hold)
dev_close(d);
}
/*
* There are actions (like start/stop/close ... ) that may trigger aproc
* operations, a thus cannot be started from aproc context.
* To avoid problems, aprocs only change the s!tate of the device,
* and actual operations are triggered from the main loop,
* outside the aproc code path.
*
* The following routine invokes pending actions, returns 0
* on fatal error
*/
int
dev_run(struct dev *d)
{
if (d->pstate == DEV_CLOSED)
return 1;
/*
* check if device isn't gone
*/
if (((d->mode & MODE_PLAY) && !APROC_OK(d->mix)) ||
((d->mode & MODE_REC) && !APROC_OK(d->sub)) ||
((d->mode & MODE_MON) && !APROC_OK(d->submon))) {
#ifdef DEBUG
if (debug_level >= 1)
dbg_puts("device disappeared\n");
#endif
if (d->hold) {
dev_del(d);
return 0;
}
dev_close(d);
return 1;
}
switch (d->pstate) {
case DEV_INIT:
/* nothing */
break;
case DEV_START:
dev_start(d);
/* PASSTHROUGH */
case DEV_RUN:
/*
* if the device is not used, then stop it
*/
if ((!APROC_OK(d->mix) ||
d->mix->u.mix.idle > 2 * d->bufsz) &&
(!APROC_OK(d->sub) ||
d->sub->u.sub.idle > 2 * d->bufsz) &&
(!APROC_OK(d->submon) ||
d->submon->u.sub.idle > 2 * d->bufsz) &&
(!APROC_OK(d->midi) ||
d->midi->u.ctl.tstate != CTL_RUN)) {
#ifdef DEBUG
if (debug_level >= 3)
dbg_puts("device idle, suspending\n");
#endif
dev_stop(d);
if (d->refcnt == 0 && !d->hold)
dev_close(d);
else
dev_clear(d);
}
break;
}
return 1;
}
/*
* If the device is paused, then resume it.
* This routine can be called from aproc context.
*/
void
dev_wakeup(struct dev *d)
{
if (d->pstate == DEV_INIT)
d->pstate = DEV_START;
}
/*
* Find the end points connected to the mix/sub.
*/
int
dev_getep(struct dev *d,
unsigned mode, struct abuf **sibuf, struct abuf **sobuf)
{
struct abuf *ibuf, *obuf;
if (mode & MODE_PLAY) {
if (!APROC_OK(d->mix))
return 0;
ibuf = *sibuf;
for (;;) {
if (!ibuf || !ibuf->rproc) {
#ifdef DEBUG
if (debug_level >= 3) {
abuf_dbg(*sibuf);
dbg_puts(": not connected to device\n");
}
#endif
return 0;
}
if (ibuf->rproc == d->mix)
break;
ibuf = LIST_FIRST(&ibuf->rproc->outs);
}
*sibuf = ibuf;
}
if (mode & MODE_REC) {
if (!APROC_OK(d->sub))
return 0;
obuf = *sobuf;
for (;;) {
if (!obuf || !obuf->wproc) {
#ifdef DEBUG
if (debug_level >= 3) {
abuf_dbg(*sobuf);
dbg_puts(": not connected to device\n");
}
#endif
return 0;
}
if (obuf->wproc == d->sub)
break;
obuf = LIST_FIRST(&obuf->wproc->ins);
}
*sobuf = obuf;
}
if (mode & MODE_MON) {
if (!APROC_OK(d->submon))
return 0;
obuf = *sobuf;
for (;;) {
if (!obuf || !obuf->wproc) {
#ifdef DEBUG
if (debug_level >= 3) {
abuf_dbg(*sobuf);
dbg_puts(": not connected to device\n");
}
#endif
return 0;
}
if (obuf->wproc == d->submon)
break;
obuf = LIST_FIRST(&obuf->wproc->ins);
}
*sobuf = obuf;
}
return 1;
}
/*
* Sync play buffer to rec buffer (for instance when one of
* them underruns/overruns).
*/
void
dev_sync(struct dev *d, unsigned mode, struct abuf *ibuf, struct abuf *obuf)
{
int delta, offs;
struct abuf *mbuf = NULL;
if (!dev_getep(d, mode, &ibuf, &obuf))
return;
/*
* Calculate delta, the number of frames the play chain is ahead
* of the record chain. It's necessary to schedule silences (or
* drops) in order to start playback and record in sync.
*/
offs = 0;
delta = 0;
if (APROC_OK(d->mix)) {
mbuf = LIST_FIRST(&d->mix->outs);
offs += mbuf->w.mix.todo;
delta += d->mix->u.mix.lat;
}
if (APROC_OK(d->sub))
delta += d->sub->u.sub.lat;
#ifdef DEBUG
if (debug_level >= 3) {
dbg_puts("syncing device");
if (APROC_OK(d->mix)) {
dbg_puts(", ");
aproc_dbg(d->mix);
dbg_puts(": todo = ");
dbg_putu(mbuf->w.mix.todo);
dbg_puts(": lat = ");
dbg_putu(d->mix->u.mix.lat);
}
if (APROC_OK(d->sub)) {
dbg_puts(", ");
aproc_dbg(d->sub);
dbg_puts(": lat = ");
dbg_putu(d->sub->u.sub.lat);
}
dbg_puts("\n");
}
#endif
if (mode & MODE_PLAY)
mix_drop(ibuf, -offs);
if (mode & MODE_RECMASK)
sub_silence(obuf, -(offs + delta));
}
/*
* return the current latency (in frames), ie the latency that
* a stream would have if dev_attach() is called on it.
*/
int
dev_getpos(struct dev *d)
{
struct abuf *mbuf = NULL;
if (APROC_OK(d->mix)) {
mbuf = LIST_FIRST(&d->mix->outs);
return -(mbuf->w.mix.todo + d->mix->u.mix.lat);
} else
return 0;
}
/*
* Attach the given input and output buffers to the mixer and the
* multiplexer respectively. The operation is done synchronously, so
* both buffers enter in sync. If buffers do not match play
* and rec.
*/
void
dev_attach(struct dev *d, char *name, unsigned mode,
struct abuf *ibuf, struct aparams *sipar, unsigned inch,
struct abuf *obuf, struct aparams *sopar, unsigned onch,
unsigned xrun, int vol)
{
struct abuf *pbuf = NULL, *rbuf = NULL;
struct aparams ipar, opar;
struct aproc *conv;
unsigned round, nblk, nch;
#ifdef DEBUG
if ((!APROC_OK(d->mix) && (mode & MODE_PLAY)) ||
(!APROC_OK(d->sub) && (mode & MODE_REC)) ||
(!APROC_OK(d->submon) && (mode & MODE_MON))) {
dbg_puts("mode beyond device mode, not attaching\n");
return;
}
#endif
if (mode & MODE_PLAY) {
ipar = *sipar;
pbuf = LIST_FIRST(&d->mix->outs);
nblk = (d->bufsz / d->round + 3) / 4;
round = dev_roundof(d, ipar.rate);
nch = ipar.cmax - ipar.cmin + 1;
if (!aparams_eqenc(&ipar, &d->opar)) {
conv = dec_new(name, &ipar);
ipar.bps = d->opar.bps;
ipar.bits = d->opar.bits;
ipar.sig = d->opar.sig;
ipar.le = d->opar.le;
ipar.msb = d->opar.msb;
aproc_setin(conv, ibuf);
ibuf = abuf_new(nblk * round, &ipar);
aproc_setout(conv, ibuf);
}
if (inch > 0 && nch >= inch * 2) {
conv = join_new(name);
aproc_setin(conv, ibuf);
ipar.cmax = ipar.cmin + inch - 1;
ibuf = abuf_new(nblk * round, &ipar);
aproc_setout(conv, ibuf);
}
if (!aparams_eqrate(&ipar, &d->opar)) {
conv = resamp_new(name, round, d->round);
ipar.rate = d->opar.rate;
round = d->round;
aproc_setin(conv, ibuf);
ibuf = abuf_new(nblk * round, &ipar);
aproc_setout(conv, ibuf);
}
if (inch > 0 && nch * 2 <= inch) {
conv = join_new(name);
aproc_setin(conv, ibuf);
ipar.cmax = ipar.cmin + inch - 1;
ibuf = abuf_new(nblk * round, &ipar);
aproc_setout(conv, ibuf);
}
aproc_setin(d->mix, ibuf);
ibuf->r.mix.xrun = xrun;
ibuf->r.mix.maxweight = vol;
mix_setmaster(d->mix);
}
if (mode & MODE_REC) {
opar = *sopar;
rbuf = LIST_FIRST(&d->sub->ins);
round = dev_roundof(d, opar.rate);
nblk = (d->bufsz / d->round + 3) / 4;
nch = opar.cmax - opar.cmin + 1;
if (!aparams_eqenc(&opar, &d->ipar)) {
conv = enc_new(name, &opar);
opar.bps = d->ipar.bps;
opar.bits = d->ipar.bits;
opar.sig = d->ipar.sig;
opar.le = d->ipar.le;
opar.msb = d->ipar.msb;
aproc_setout(conv, obuf);
obuf = abuf_new(nblk * round, &opar);
aproc_setin(conv, obuf);
}
if (onch > 0 && nch >= onch * 2) {
conv = join_new(name);
aproc_setout(conv, obuf);
opar.cmax = opar.cmin + onch - 1;
obuf = abuf_new(nblk * round, &opar);
aproc_setin(conv, obuf);
}
if (!aparams_eqrate(&opar, &d->ipar)) {
conv = resamp_new(name, d->round, round);
opar.rate = d->ipar.rate;
round = d->round;
aproc_setout(conv, obuf);
obuf = abuf_new(nblk * round, &opar);
aproc_setin(conv, obuf);
}
if (onch > 0 && nch * 2 <= onch) {
conv = join_new(name);
aproc_setout(conv, obuf);
opar.cmax = opar.cmin + onch - 1;
obuf = abuf_new(nblk * round, &opar);
aproc_setin(conv, obuf);
}
aproc_setout(d->sub, obuf);
obuf->w.sub.xrun = xrun;
}
if (mode & MODE_MON) {
opar = *sopar;
rbuf = LIST_FIRST(&d->submon->ins);
round = dev_roundof(d, opar.rate);
nblk = (d->bufsz / d->round + 3) / 4;
nch = opar.cmax - opar.cmin + 1;
if (!aparams_eqenc(&opar, &d->opar)) {
conv = enc_new(name, &opar);
opar.bps = d->opar.bps;
opar.bits = d->opar.bits;
opar.sig = d->opar.sig;
opar.le = d->opar.le;
opar.msb = d->opar.msb;
aproc_setout(conv, obuf);
obuf = abuf_new(nblk * round, &opar);
aproc_setin(conv, obuf);
}
if (onch > 0 && nch >= onch * 2) {
conv = join_new(name);
aproc_setout(conv, obuf);
opar.cmax = opar.cmin + onch - 1;
obuf = abuf_new(nblk * round, &opar);
aproc_setin(conv, obuf);
}
if (!aparams_eqrate(&opar, &d->opar)) {
conv = resamp_new(name, d->round, round);
opar.rate = d->opar.rate;
round = d->round;
aproc_setout(conv, obuf);
obuf = abuf_new(nblk * round, &opar);
aproc_setin(conv, obuf);
}
if (onch > 0 && nch * 2 <= onch) {
conv = join_new(name);
aproc_setout(conv, obuf);
opar.cmax = opar.cmin + onch - 1;
obuf = abuf_new(nblk * round, &opar);
aproc_setin(conv, obuf);
}
aproc_setout(d->submon, obuf);
obuf->w.sub.xrun = xrun;
}
/*
* Sync play to record.
*/
if ((mode & MODE_PLAY) && (mode & MODE_RECMASK)) {
ibuf->duplex = obuf;
obuf->duplex = ibuf;
}
dev_sync(d, mode, ibuf, obuf);
}
/*
* Change the playback volume of the given stream.
*/
void
dev_setvol(struct dev *d, struct abuf *ibuf, int vol)
{
#ifdef DEBUG
if (debug_level >= 3) {
abuf_dbg(ibuf);
dbg_puts(": setting volume to ");
dbg_putu(vol);
dbg_puts("\n");
}
#endif
if (!dev_getep(d, MODE_PLAY, &ibuf, NULL)) {
return;
}
ibuf->r.mix.vol = vol;
}
/*
* Clear buffers of the play and record chains so that when the device
* is started, playback and record start in sync.
*/
void
dev_clear(struct dev *d)
{
struct abuf *buf;
if (APROC_OK(d->mix)) {
#ifdef DEBUG
if (!LIST_EMPTY(&d->mix->ins)) {
dbg_puts("play end not idle, can't clear device\n");
dbg_panic();
}
#endif
buf = LIST_FIRST(&d->mix->outs);
while (buf) {
abuf_clear(buf);
buf = LIST_FIRST(&buf->rproc->outs);
}
mix_clear(d->mix);
}
if (APROC_OK(d->sub)) {
#ifdef DEBUG
if (!LIST_EMPTY(&d->sub->outs)) {
dbg_puts("record end not idle, can't clear device\n");
dbg_panic();
}
#endif
buf = LIST_FIRST(&d->sub->ins);
while (buf) {
abuf_clear(buf);
buf = LIST_FIRST(&buf->wproc->ins);
}
sub_clear(d->sub);
}
if (APROC_OK(d->submon)) {
#ifdef DEBUG
if (!LIST_EMPTY(&d->submon->outs)) {
dbg_puts("monitoring end not idle, can't clear device\n");
dbg_panic();
}
#endif
buf = LIST_FIRST(&d->submon->ins);
while (buf) {
abuf_clear(buf);
buf = LIST_FIRST(&buf->wproc->ins);
}
sub_clear(d->submon);
mon_clear(d->mon);
}
}
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