2 * Copyright (c) 2008-2009 Ariff Abdullah <ariff@FreeBSD.org>
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 #ifdef HAVE_KERNEL_OPTION_HEADERS
31 #include <dev/sound/pcm/sound.h>
33 #include "feeder_if.h"
35 SND_DECLARE_FILE("$FreeBSD$");
38 struct feeder_chain_state {
39 uint32_t afmt; /* audio format */
40 uint32_t rate; /* sampling rate */
41 struct pcmchan_matrix *matrix; /* matrix map */
45 * chain descriptor that will be passed around from the beginning until the
46 * end of chain process.
48 struct feeder_chain_desc {
49 struct feeder_chain_state origin; /* original state */
50 struct feeder_chain_state current; /* current state */
51 struct feeder_chain_state target; /* target state */
52 struct pcm_feederdesc desc; /* feeder descriptor */
53 uint32_t afmt_ne; /* prefered native endian */
54 int mode; /* chain mode */
55 int use_eq; /* need EQ? */
56 int use_matrix; /* need channel matrixing? */
57 int use_volume; /* need softpcmvol? */
58 int dummy; /* dummy passthrough */
59 int expensive; /* possibly expensive */
62 #define FEEDER_CHAIN_LEAN 0
63 #define FEEDER_CHAIN_16 1
64 #define FEEDER_CHAIN_32 2
65 #define FEEDER_CHAIN_MULTI 3
66 #define FEEDER_CHAIN_FULLMULTI 4
67 #define FEEDER_CHAIN_LAST 5
69 #if defined(SND_FEEDER_FULL_MULTIFORMAT)
70 #define FEEDER_CHAIN_DEFAULT FEEDER_CHAIN_FULLMULTI
71 #elif defined(SND_FEEDER_MULTIFORMAT)
72 #define FEEDER_CHAIN_DEFAULT FEEDER_CHAIN_MULTI
74 #define FEEDER_CHAIN_DEFAULT FEEDER_CHAIN_LEAN
78 * List of prefered formats that might be required during
79 * processing. It will be decided through snd_fmtbest().
82 /* 'Lean' mode, signed 16 or 32 bit native endian. */
83 static uint32_t feeder_chain_formats_lean[] = {
84 AFMT_S16_NE, AFMT_S32_NE,
88 /* Force everything to signed 16 bit native endian. */
89 static uint32_t feeder_chain_formats_16[] = {
94 /* Force everything to signed 32 bit native endian. */
95 static uint32_t feeder_chain_formats_32[] = {
100 /* Multiple choices, all except 8 bit. */
101 static uint32_t feeder_chain_formats_multi[] = {
102 AFMT_S16_LE, AFMT_S16_BE, AFMT_U16_LE, AFMT_U16_BE,
103 AFMT_S24_LE, AFMT_S24_BE, AFMT_U24_LE, AFMT_U24_BE,
104 AFMT_S32_LE, AFMT_S32_BE, AFMT_U32_LE, AFMT_U32_BE,
108 /* Everything that is convertible. */
109 static uint32_t feeder_chain_formats_fullmulti[] = {
111 AFMT_S16_LE, AFMT_S16_BE, AFMT_U16_LE, AFMT_U16_BE,
112 AFMT_S24_LE, AFMT_S24_BE, AFMT_U24_LE, AFMT_U24_BE,
113 AFMT_S32_LE, AFMT_S32_BE, AFMT_U32_LE, AFMT_U32_BE,
117 static uint32_t *feeder_chain_formats[FEEDER_CHAIN_LAST] = {
118 [FEEDER_CHAIN_LEAN] = feeder_chain_formats_lean,
119 [FEEDER_CHAIN_16] = feeder_chain_formats_16,
120 [FEEDER_CHAIN_32] = feeder_chain_formats_32,
121 [FEEDER_CHAIN_MULTI] = feeder_chain_formats_multi,
122 [FEEDER_CHAIN_FULLMULTI] = feeder_chain_formats_fullmulti
125 static int feeder_chain_mode = FEEDER_CHAIN_DEFAULT;
127 #if defined(_KERNEL) && defined(SND_DEBUG) && defined(SND_FEEDER_FULL_MULTIFORMAT)
128 TUNABLE_INT("hw.snd.feeder_chain_mode", &feeder_chain_mode);
129 SYSCTL_INT(_hw_snd, OID_AUTO, feeder_chain_mode, CTLFLAG_RW,
130 &feeder_chain_mode, 0,
132 "(0=lean, 1=16bit, 2=32bit, 3=multiformat, 4=fullmultiformat)");
136 * feeder_build_format(): Chain any format converter.
139 feeder_build_format(struct pcm_channel *c, struct feeder_chain_desc *cdesc)
141 struct feeder_class *fc;
142 struct pcm_feederdesc *desc;
145 desc = &(cdesc->desc);
146 desc->type = FEEDER_FORMAT;
151 fc = feeder_getclass(desc);
153 device_printf(c->dev,
154 "%s(): can't find feeder_format\n", __func__);
158 desc->in = cdesc->current.afmt;
159 desc->out = cdesc->target.afmt;
161 ret = chn_addfeeder(c, fc, desc);
163 device_printf(c->dev,
164 "%s(): can't add feeder_format\n", __func__);
168 c->feederflags |= 1 << FEEDER_FORMAT;
170 cdesc->current.afmt = cdesc->target.afmt;
176 * feeder_build_formatne(): Chain format converter that suite best for native
180 feeder_build_formatne(struct pcm_channel *c, struct feeder_chain_desc *cdesc)
182 struct feeder_chain_state otarget;
185 if (cdesc->afmt_ne == 0 ||
186 AFMT_ENCODING(cdesc->current.afmt) == cdesc->afmt_ne)
189 otarget = cdesc->target;
190 cdesc->target = cdesc->current;
191 cdesc->target.afmt = SND_FORMAT(cdesc->afmt_ne,
192 cdesc->current.matrix->channels, cdesc->current.matrix->ext);
194 ret = feeder_build_format(c, cdesc);
198 cdesc->target = otarget;
204 * feeder_build_rate(): Chain sample rate converter.
207 feeder_build_rate(struct pcm_channel *c, struct feeder_chain_desc *cdesc)
209 struct feeder_class *fc;
210 struct pcm_feeder *f;
211 struct pcm_feederdesc *desc;
214 ret = feeder_build_formatne(c, cdesc);
218 desc = &(cdesc->desc);
219 desc->type = FEEDER_RATE;
224 fc = feeder_getclass(desc);
226 device_printf(c->dev,
227 "%s(): can't find feeder_rate\n", __func__);
231 desc->in = cdesc->current.afmt;
232 desc->out = desc->in;
234 ret = chn_addfeeder(c, fc, desc);
236 device_printf(c->dev,
237 "%s(): can't add feeder_rate\n", __func__);
244 * If in 'dummy' mode (possibly due to passthrough mode), set the
245 * conversion quality to the lowest possible (should be fastest) since
246 * listener won't be hearing anything. Theoretically we can just
247 * disable it, but that will cause weird runtime behaviour:
248 * application appear to play something that is either too fast or too
251 if (cdesc->dummy != 0) {
252 ret = FEEDER_SET(f, FEEDRATE_QUALITY, 0);
254 device_printf(c->dev,
255 "%s(): can't set resampling quality\n", __func__);
260 ret = FEEDER_SET(f, FEEDRATE_SRC, cdesc->current.rate);
262 device_printf(c->dev,
263 "%s(): can't set source rate\n", __func__);
267 ret = FEEDER_SET(f, FEEDRATE_DST, cdesc->target.rate);
269 device_printf(c->dev,
270 "%s(): can't set destination rate\n", __func__);
274 c->feederflags |= 1 << FEEDER_RATE;
276 cdesc->current.rate = cdesc->target.rate;
282 * feeder_build_matrix(): Chain channel matrixing converter.
285 feeder_build_matrix(struct pcm_channel *c, struct feeder_chain_desc *cdesc)
287 struct feeder_class *fc;
288 struct pcm_feeder *f;
289 struct pcm_feederdesc *desc;
292 ret = feeder_build_formatne(c, cdesc);
296 desc = &(cdesc->desc);
297 desc->type = FEEDER_MATRIX;
302 fc = feeder_getclass(desc);
304 device_printf(c->dev,
305 "%s(): can't find feeder_matrix\n", __func__);
309 desc->in = cdesc->current.afmt;
310 desc->out = SND_FORMAT(cdesc->current.afmt,
311 cdesc->target.matrix->channels, cdesc->target.matrix->ext);
313 ret = chn_addfeeder(c, fc, desc);
315 device_printf(c->dev,
316 "%s(): can't add feeder_matrix\n", __func__);
321 ret = feeder_matrix_setup(f, cdesc->current.matrix,
322 cdesc->target.matrix);
324 device_printf(c->dev,
325 "%s(): feeder_matrix_setup() failed\n", __func__);
329 c->feederflags |= 1 << FEEDER_MATRIX;
331 cdesc->current.afmt = desc->out;
332 cdesc->current.matrix = cdesc->target.matrix;
333 cdesc->use_matrix = 0;
339 * feeder_build_volume(): Chain soft volume.
342 feeder_build_volume(struct pcm_channel *c, struct feeder_chain_desc *cdesc)
344 struct feeder_class *fc;
345 struct pcm_feeder *f;
346 struct pcm_feederdesc *desc;
349 ret = feeder_build_formatne(c, cdesc);
353 desc = &(cdesc->desc);
354 desc->type = FEEDER_VOLUME;
359 fc = feeder_getclass(desc);
361 device_printf(c->dev,
362 "%s(): can't find feeder_volume\n", __func__);
366 desc->in = cdesc->current.afmt;
367 desc->out = desc->in;
369 ret = chn_addfeeder(c, fc, desc);
371 device_printf(c->dev,
372 "%s(): can't add feeder_volume\n", __func__);
379 * If in 'dummy' mode (possibly due to passthrough mode), set BYPASS
380 * mode since listener won't be hearing anything. Theoretically we can
381 * just disable it, but that will confuse volume per channel mixer.
383 if (cdesc->dummy != 0) {
384 ret = FEEDER_SET(f, FEEDVOLUME_STATE, FEEDVOLUME_BYPASS);
386 device_printf(c->dev,
387 "%s(): can't set volume bypass\n", __func__);
392 ret = feeder_volume_apply_matrix(f, cdesc->current.matrix);
394 device_printf(c->dev,
395 "%s(): feeder_volume_apply_matrix() failed\n", __func__);
399 c->feederflags |= 1 << FEEDER_VOLUME;
401 cdesc->use_volume = 0;
407 * feeder_build_eq(): Chain parametric software equalizer.
410 feeder_build_eq(struct pcm_channel *c, struct feeder_chain_desc *cdesc)
412 struct feeder_class *fc;
413 struct pcm_feeder *f;
414 struct pcm_feederdesc *desc;
417 ret = feeder_build_formatne(c, cdesc);
421 desc = &(cdesc->desc);
422 desc->type = FEEDER_EQ;
427 fc = feeder_getclass(desc);
429 device_printf(c->dev,
430 "%s(): can't find feeder_eq\n", __func__);
434 desc->in = cdesc->current.afmt;
435 desc->out = desc->in;
437 ret = chn_addfeeder(c, fc, desc);
439 device_printf(c->dev,
440 "%s(): can't add feeder_eq\n", __func__);
446 ret = FEEDER_SET(f, FEEDEQ_RATE, cdesc->current.rate);
448 device_printf(c->dev,
449 "%s(): can't set rate on feeder_eq\n", __func__);
453 c->feederflags |= 1 << FEEDER_EQ;
461 * feeder_build_root(): Chain root feeder, the top, father of all.
464 feeder_build_root(struct pcm_channel *c, struct feeder_chain_desc *cdesc)
466 struct feeder_class *fc;
469 fc = feeder_getclass(NULL);
471 device_printf(c->dev,
472 "%s(): can't find feeder_root\n", __func__);
476 ret = chn_addfeeder(c, fc, NULL);
478 device_printf(c->dev,
479 "%s(): can't add feeder_root\n", __func__);
483 c->feederflags |= 1 << FEEDER_ROOT;
485 c->feeder->desc->in = cdesc->current.afmt;
486 c->feeder->desc->out = cdesc->current.afmt;
492 * feeder_build_mixer(): Chain software mixer for virtual channels.
495 feeder_build_mixer(struct pcm_channel *c, struct feeder_chain_desc *cdesc)
497 struct feeder_class *fc;
498 struct pcm_feederdesc *desc;
501 desc = &(cdesc->desc);
502 desc->type = FEEDER_MIXER;
507 fc = feeder_getclass(desc);
509 device_printf(c->dev,
510 "%s(): can't find feeder_mixer\n", __func__);
514 desc->in = cdesc->current.afmt;
515 desc->out = desc->in;
517 ret = chn_addfeeder(c, fc, desc);
519 device_printf(c->dev,
520 "%s(): can't add feeder_mixer\n", __func__);
524 c->feederflags |= 1 << FEEDER_MIXER;
529 /* Macrosses to ease our job doing stuffs later. */
530 #define FEEDER_BW(c, t) ((c)->t.matrix->channels * (c)->t.rate)
532 #define FEEDRATE_UP(c) ((c)->target.rate > (c)->current.rate)
533 #define FEEDRATE_DOWN(c) ((c)->target.rate < (c)->current.rate)
534 #define FEEDRATE_REQUIRED(c) (FEEDRATE_UP(c) || FEEDRATE_DOWN(c))
536 #define FEEDMATRIX_UP(c) ((c)->target.matrix->channels > \
537 (c)->current.matrix->channels)
538 #define FEEDMATRIX_DOWN(c) ((c)->target.matrix->channels < \
539 (c)->current.matrix->channels)
540 #define FEEDMATRIX_REQUIRED(c) (FEEDMATRIX_UP(c) || \
541 FEEDMATRIX_DOWN(c) || (c)->use_matrix != 0)
543 #define FEEDFORMAT_REQUIRED(c) (AFMT_ENCODING((c)->current.afmt) != \
544 AFMT_ENCODING((c)->target.afmt))
546 #define FEEDVOLUME_REQUIRED(c) ((c)->use_volume != 0)
548 #define FEEDEQ_VALIDRATE(c, t) (feeder_eq_validrate((c)->t.rate) != 0)
549 #define FEEDEQ_ECONOMY(c) (FEEDER_BW(c, current) < FEEDER_BW(c, target))
550 #define FEEDEQ_REQUIRED(c) ((c)->use_eq != 0 && \
551 FEEDEQ_VALIDRATE(c, current))
553 #define FEEDFORMAT_NE_REQUIRED(c) \
554 ((c)->afmt_ne != AFMT_S32_NE && \
555 (((c)->mode == FEEDER_CHAIN_16 && \
556 AFMT_ENCODING((c)->current.afmt) != AFMT_S16_NE) || \
557 ((c)->mode == FEEDER_CHAIN_32 && \
558 AFMT_ENCODING((c)->current.afmt) != AFMT_S32_NE) || \
559 (c)->mode == FEEDER_CHAIN_FULLMULTI || \
560 ((c)->mode == FEEDER_CHAIN_MULTI && \
561 ((c)->current.afmt & AFMT_8BIT)) || \
562 ((c)->mode == FEEDER_CHAIN_LEAN && \
563 !((c)->current.afmt & (AFMT_S16_NE | AFMT_S32_NE)))))
566 feeder_default_matrix(struct pcmchan_matrix *m, uint32_t fmt, int id)
570 memset(m, 0, sizeof(*m));
573 m->channels = AFMT_CHANNEL(fmt);
574 m->ext = AFMT_EXTCHANNEL(fmt);
575 for (x = 0; x != SND_CHN_T_MAX; x++)
580 feeder_chain(struct pcm_channel *c)
582 struct snddev_info *d;
583 struct pcmchan_caps *caps;
584 struct feeder_chain_desc cdesc;
585 struct pcmchan_matrix *hwmatrix, *softmatrix;
586 uint32_t hwfmt, softfmt;
591 /* Remove everything first. */
592 while (chn_removefeeder(c) == 0)
595 KASSERT(c->feeder == NULL, ("feeder chain not empty"));
597 /* clear and populate chain descriptor. */
598 bzero(&cdesc, sizeof(cdesc));
600 switch (feeder_chain_mode) {
601 case FEEDER_CHAIN_LEAN:
602 case FEEDER_CHAIN_16:
603 case FEEDER_CHAIN_32:
604 #if defined(SND_FEEDER_MULTIFORMAT) || defined(SND_FEEDER_FULL_MULTIFORMAT)
605 case FEEDER_CHAIN_MULTI:
607 #if defined(SND_FEEDER_FULL_MULTIFORMAT)
608 case FEEDER_CHAIN_FULLMULTI:
612 feeder_chain_mode = FEEDER_CHAIN_DEFAULT;
616 cdesc.mode = feeder_chain_mode;
617 cdesc.expensive = 1; /* XXX faster.. */
619 #define VCHAN_PASSTHROUGH(c) (((c)->flags & (CHN_F_VIRTUAL | \
620 CHN_F_PASSTHROUGH)) == \
621 (CHN_F_VIRTUAL | CHN_F_PASSTHROUGH))
623 /* Get the best possible hardware format. */
624 if (VCHAN_PASSTHROUGH(c))
625 hwfmt = c->parentchannel->format;
627 caps = chn_getcaps(c);
628 if (caps == NULL || caps->fmtlist == NULL) {
629 device_printf(c->dev,
630 "%s(): failed to get channel caps\n", __func__);
634 if ((c->format & AFMT_PASSTHROUGH) &&
635 !snd_fmtvalid(c->format, caps->fmtlist))
638 hwfmt = snd_fmtbest(c->format, caps->fmtlist);
639 if (hwfmt == 0 || !snd_fmtvalid(hwfmt, caps->fmtlist)) {
640 device_printf(c->dev,
641 "%s(): invalid hardware format 0x%08x\n",
645 for (i = 0; caps->fmtlist[i] != 0; i++)
646 printf("0x%08x\n", caps->fmtlist[i]);
647 printf("Req: 0x%08x\n", c->format);
654 * The 'hardware' possibly have different intepretation of channel
655 * matrixing, so get it first .....
657 hwmatrix = CHANNEL_GETMATRIX(c->methods, c->devinfo, hwfmt);
658 if (hwmatrix == NULL) {
659 /* setup a default matrix */
660 hwmatrix = &c->matrix_scratch;
661 feeder_default_matrix(hwmatrix, hwfmt,
662 SND_CHN_MATRIX_UNKNOWN);
664 /* ..... and rebuild hwfmt. */
665 hwfmt = SND_FORMAT(hwfmt, hwmatrix->channels, hwmatrix->ext);
667 /* Reset and rebuild default channel format/matrix map. */
669 softmatrix = &c->matrix;
670 if (softmatrix->channels != AFMT_CHANNEL(softfmt) ||
671 softmatrix->ext != AFMT_EXTCHANNEL(softfmt)) {
672 softmatrix = feeder_matrix_format_map(softfmt);
673 if (softmatrix == NULL) {
674 /* setup a default matrix */
675 softmatrix = &c->matrix;
676 feeder_default_matrix(softmatrix, softfmt,
677 SND_CHN_MATRIX_PCMCHANNEL);
679 c->matrix = *softmatrix;
680 c->matrix.id = SND_CHN_MATRIX_PCMCHANNEL;
683 softfmt = SND_FORMAT(softfmt, softmatrix->channels, softmatrix->ext);
684 if (softfmt != c->format)
685 device_printf(c->dev,
686 "%s(): WARNING: %s Soft format 0x%08x -> 0x%08x\n",
687 __func__, CHN_DIRSTR(c), c->format, softfmt);
690 * PLAY and REC are opposite.
692 if (c->direction == PCMDIR_PLAY) {
693 cdesc.origin.afmt = softfmt;
694 cdesc.origin.matrix = softmatrix;
695 cdesc.origin.rate = c->speed;
696 cdesc.target.afmt = hwfmt;
697 cdesc.target.matrix = hwmatrix;
698 cdesc.target.rate = sndbuf_getspd(c->bufhard);
700 cdesc.origin.afmt = hwfmt;
701 cdesc.origin.matrix = hwmatrix;
702 cdesc.origin.rate = sndbuf_getspd(c->bufhard);
703 cdesc.target.afmt = softfmt;
704 cdesc.target.matrix = softmatrix;
705 cdesc.target.rate = c->speed;
711 * If channel is in bitperfect or passthrough mode, make it appear
712 * that 'origin' and 'target' identical, skipping mostly chain
715 if (CHN_BITPERFECT(c) || (c->format & AFMT_PASSTHROUGH)) {
716 if (c->direction == PCMDIR_PLAY)
717 cdesc.origin = cdesc.target;
719 cdesc.target = cdesc.origin;
720 c->format = cdesc.target.afmt;
721 c->speed = cdesc.target.rate;
723 /* hwfmt is not convertible, so 'dummy' it. */
724 if (hwfmt & AFMT_PASSTHROUGH)
727 if ((softfmt & AFMT_CONVERTIBLE) &&
728 (((d->flags & SD_F_VPC) && !(c->flags & CHN_F_HAS_VCHAN)) ||
729 (!(d->flags & SD_F_VPC) && (d->flags & SD_F_SOFTPCMVOL) &&
730 !(c->flags & CHN_F_VIRTUAL))))
731 cdesc.use_volume = 1;
733 if (feeder_matrix_compare(cdesc.origin.matrix,
734 cdesc.target.matrix) != 0)
735 cdesc.use_matrix = 1;
737 /* Soft EQ only applicable for PLAY. */
738 if (cdesc.dummy == 0 &&
739 c->direction == PCMDIR_PLAY && (d->flags & SD_F_EQ) &&
740 (((d->flags & SD_F_EQ_PC) &&
741 !(c->flags & CHN_F_HAS_VCHAN)) ||
742 (!(d->flags & SD_F_EQ_PC) && !(c->flags & CHN_F_VIRTUAL))))
745 if (FEEDFORMAT_NE_REQUIRED(&cdesc)) {
748 snd_fmtbest(AFMT_ENCODING(softfmt),
749 feeder_chain_formats[cdesc.mode]) :
750 snd_fmtbest(AFMT_ENCODING(cdesc.target.afmt),
751 feeder_chain_formats[cdesc.mode]);
752 if (cdesc.afmt_ne == 0) {
753 device_printf(c->dev,
754 "%s(): snd_fmtbest failed!\n", __func__);
756 (((cdesc.dummy != 0) ? softfmt :
758 (AFMT_24BIT | AFMT_32BIT)) ?
759 AFMT_S32_NE : AFMT_S16_NE;
764 cdesc.current = cdesc.origin;
766 /* Build everything. */
770 #define FEEDER_BUILD(t) do { \
771 ret = feeder_build_##t(c, &cdesc); \
776 if (!(c->flags & CHN_F_HAS_VCHAN) || c->direction == PCMDIR_REC)
778 else if (c->direction == PCMDIR_PLAY && (c->flags & CHN_F_HAS_VCHAN))
784 * The basic idea is: The smaller the bandwidth, the cheaper the
785 * conversion process, with following constraints:-
787 * 1) Almost all feeders work best in 16/32 native endian.
788 * 2) Try to avoid 8bit feeders due to poor dynamic range.
789 * 3) Avoid volume, format, matrix and rate in BITPERFECT or
791 * 4) Try putting volume before EQ or rate. Should help to
792 * avoid/reduce possible clipping.
793 * 5) EQ require specific, valid rate, unless it allow sloppy
796 if (FEEDMATRIX_UP(&cdesc)) {
797 if (FEEDEQ_REQUIRED(&cdesc) &&
798 (!FEEDEQ_VALIDRATE(&cdesc, target) ||
799 (cdesc.expensive == 0 && FEEDEQ_ECONOMY(&cdesc))))
801 if (FEEDRATE_REQUIRED(&cdesc))
803 FEEDER_BUILD(matrix);
804 if (FEEDVOLUME_REQUIRED(&cdesc))
805 FEEDER_BUILD(volume);
806 if (FEEDEQ_REQUIRED(&cdesc))
808 } else if (FEEDMATRIX_DOWN(&cdesc)) {
809 FEEDER_BUILD(matrix);
810 if (FEEDVOLUME_REQUIRED(&cdesc))
811 FEEDER_BUILD(volume);
812 if (FEEDEQ_REQUIRED(&cdesc) &&
813 (!FEEDEQ_VALIDRATE(&cdesc, target) ||
814 FEEDEQ_ECONOMY(&cdesc)))
816 if (FEEDRATE_REQUIRED(&cdesc))
818 if (FEEDEQ_REQUIRED(&cdesc))
821 if (FEEDRATE_DOWN(&cdesc)) {
822 if (FEEDEQ_REQUIRED(&cdesc) &&
823 !FEEDEQ_VALIDRATE(&cdesc, target)) {
824 if (FEEDVOLUME_REQUIRED(&cdesc))
825 FEEDER_BUILD(volume);
830 if (FEEDMATRIX_REQUIRED(&cdesc))
831 FEEDER_BUILD(matrix);
832 if (FEEDVOLUME_REQUIRED(&cdesc))
833 FEEDER_BUILD(volume);
834 if (FEEDRATE_UP(&cdesc)) {
835 if (FEEDEQ_REQUIRED(&cdesc) &&
836 !FEEDEQ_VALIDRATE(&cdesc, target))
840 if (FEEDEQ_REQUIRED(&cdesc))
844 if (FEEDFORMAT_REQUIRED(&cdesc))
845 FEEDER_BUILD(format);
847 if (c->direction == PCMDIR_REC && (c->flags & CHN_F_HAS_VCHAN))
850 sndbuf_setfmt(c->bufsoft, c->format);
851 sndbuf_setspd(c->bufsoft, c->speed);
853 sndbuf_setfmt(c->bufhard, hwfmt);