2 * QEMU OSS audio driver
4 * Copyright (c) 2003-2005 Vassili Karpov (malc)
6 * Permission is hereby granted, free of charge, to any person obtaining a copy
7 * of this software and associated documentation files (the "Software"), to deal
8 * in the Software without restriction, including without limitation the rights
9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
10 * copies of the Software, and to permit persons to whom the Software is
11 * furnished to do so, subject to the following conditions:
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
26 #include <sys/types.h>
27 #include <sys/ioctl.h>
29 #include <soundcard.h>
31 #include <sys/soundcard.h>
33 #include "qemu-common.h"
34 #include "host-utils.h"
35 #include "qemu-char.h"
38 #define AUDIO_CAP "oss"
39 #include "audio_int.h"
41 #if defined OSS_GETVERSION && defined SNDCTL_DSP_POLICY
42 #define USE_DSP_POLICY
45 typedef struct OSSVoiceOut {
56 typedef struct OSSVoiceIn {
68 const char *devpath_out;
69 const char *devpath_in;
77 .devpath_out = "/dev/dsp",
78 .devpath_in = "/dev/dsp",
92 static void GCC_FMT_ATTR (2, 3) oss_logerr (int err, const char *fmt, ...)
97 AUD_vlog (AUDIO_CAP, fmt, ap);
100 AUD_log (AUDIO_CAP, "Reason: %s\n", strerror (err));
103 static void GCC_FMT_ATTR (3, 4) oss_logerr2 (
112 AUD_log (AUDIO_CAP, "Could not initialize %s\n", typ);
115 AUD_vlog (AUDIO_CAP, fmt, ap);
118 AUD_log (AUDIO_CAP, "Reason: %s\n", strerror (err));
121 static void oss_anal_close (int *fdp)
125 qemu_set_fd_handler (*fdp, NULL, NULL, NULL);
128 oss_logerr (errno, "Failed to close file(fd=%d)\n", *fdp);
133 static void oss_helper_poll_out (void *opaque)
136 audio_run ("oss_poll_out");
139 static void oss_helper_poll_in (void *opaque)
142 audio_run ("oss_poll_in");
145 static int oss_poll_out (HWVoiceOut *hw)
147 OSSVoiceOut *oss = (OSSVoiceOut *) hw;
149 return qemu_set_fd_handler (oss->fd, NULL, oss_helper_poll_out, NULL);
152 static int oss_poll_in (HWVoiceIn *hw)
154 OSSVoiceIn *oss = (OSSVoiceIn *) hw;
156 return qemu_set_fd_handler (oss->fd, oss_helper_poll_in, NULL, NULL);
159 static int oss_write (SWVoiceOut *sw, void *buf, int len)
161 return audio_pcm_sw_write (sw, buf, len);
164 static int aud_to_ossfmt (audfmt_e fmt)
180 dolog ("Internal logic error: Bad audio format %d\n", fmt);
188 static int oss_to_audfmt (int ossfmt, audfmt_e *fmt, int *endianness)
222 dolog ("Unrecognized audio format %d\n", ossfmt);
229 #if defined DEBUG_MISMATCHES || defined DEBUG
230 static void oss_dump_info (struct oss_params *req, struct oss_params *obt)
232 dolog ("parameter | requested value | obtained value\n");
233 dolog ("format | %10d | %10d\n", req->fmt, obt->fmt);
234 dolog ("channels | %10d | %10d\n",
235 req->nchannels, obt->nchannels);
236 dolog ("frequency | %10d | %10d\n", req->freq, obt->freq);
237 dolog ("nfrags | %10d | %10d\n", req->nfrags, obt->nfrags);
238 dolog ("fragsize | %10d | %10d\n",
239 req->fragsize, obt->fragsize);
243 static int oss_open (int in, struct oss_params *req,
244 struct oss_params *obt, int *pfd)
247 int oflags = conf.exclusive ? O_EXCL : 0;
248 audio_buf_info abinfo;
249 int fmt, freq, nchannels;
251 const char *dspname = in ? conf.devpath_in : conf.devpath_out;
252 const char *typ = in ? "ADC" : "DAC";
254 /* Kludge needed to have working mmap on Linux */
255 oflags |= conf.try_mmap ? O_RDWR : (in ? O_RDONLY : O_WRONLY);
257 fd = open (dspname, oflags | O_NONBLOCK);
259 oss_logerr2 (errno, typ, "Failed to open `%s'\n", dspname);
264 nchannels = req->nchannels;
267 if (ioctl (fd, SNDCTL_DSP_SAMPLESIZE, &fmt)) {
268 oss_logerr2 (errno, typ, "Failed to set sample size %d\n", req->fmt);
272 if (ioctl (fd, SNDCTL_DSP_CHANNELS, &nchannels)) {
273 oss_logerr2 (errno, typ, "Failed to set number of channels %d\n",
278 if (ioctl (fd, SNDCTL_DSP_SPEED, &freq)) {
279 oss_logerr2 (errno, typ, "Failed to set frequency %d\n", req->freq);
283 if (ioctl (fd, SNDCTL_DSP_NONBLOCK, NULL)) {
284 oss_logerr2 (errno, typ, "Failed to set non-blocking mode\n");
288 #ifdef USE_DSP_POLICY
289 if (conf.policy >= 0) {
292 if (ioctl (fd, OSS_GETVERSION, &version)) {
293 oss_logerr2 (errno, typ, "Failed to get OSS version\n");
297 dolog ("OSS version = %#x\n", version);
300 if (version >= 0x040000) {
301 int policy = conf.policy;
302 if (ioctl (fd, SNDCTL_DSP_POLICY, &policy)) {
303 oss_logerr2 (errno, typ,
304 "Failed to set timing policy to %d\n",
315 int mmmmssss = (req->nfrags << 16) | ctz32 (req->fragsize);
316 if (ioctl (fd, SNDCTL_DSP_SETFRAGMENT, &mmmmssss)) {
317 oss_logerr2 (errno, typ, "Failed to set buffer length (%d, %d)\n",
318 req->nfrags, req->fragsize);
323 if (ioctl (fd, in ? SNDCTL_DSP_GETISPACE : SNDCTL_DSP_GETOSPACE, &abinfo)) {
324 oss_logerr2 (errno, typ, "Failed to get buffer length\n");
328 if (!abinfo.fragstotal || !abinfo.fragsize) {
329 AUD_log (AUDIO_CAP, "Returned bogus buffer information(%d, %d) for %s\n",
330 abinfo.fragstotal, abinfo.fragsize, typ);
335 obt->nchannels = nchannels;
337 obt->nfrags = abinfo.fragstotal;
338 obt->fragsize = abinfo.fragsize;
341 #ifdef DEBUG_MISMATCHES
342 if ((req->fmt != obt->fmt) ||
343 (req->nchannels != obt->nchannels) ||
344 (req->freq != obt->freq) ||
345 (req->fragsize != obt->fragsize) ||
346 (req->nfrags != obt->nfrags)) {
347 dolog ("Audio parameters mismatch\n");
348 oss_dump_info (req, obt);
353 oss_dump_info (req, obt);
358 oss_anal_close (&fd);
362 static void oss_write_pending (OSSVoiceOut *oss)
364 HWVoiceOut *hw = &oss->hw;
370 while (oss->pending) {
372 ssize_t bytes_written;
373 int samples_till_end = hw->samples - oss->wpos;
374 int samples_to_write = audio_MIN (oss->pending, samples_till_end);
375 int bytes_to_write = samples_to_write << hw->info.shift;
376 void *pcm = advance (oss->pcm_buf, oss->wpos << hw->info.shift);
378 bytes_written = write (oss->fd, pcm, bytes_to_write);
379 if (bytes_written < 0) {
380 if (errno != EAGAIN) {
381 oss_logerr (errno, "failed to write %d bytes\n",
387 if (bytes_written & hw->info.align) {
388 dolog ("misaligned write asked for %d, but got %zd\n",
389 bytes_to_write, bytes_written);
393 samples_written = bytes_written >> hw->info.shift;
394 oss->pending -= samples_written;
395 oss->wpos = (oss->wpos + samples_written) % hw->samples;
396 if (bytes_written - bytes_to_write) {
402 static int oss_run_out (HWVoiceOut *hw, int live)
404 OSSVoiceOut *oss = (OSSVoiceOut *) hw;
406 struct audio_buf_info abinfo;
407 struct count_info cntinfo;
410 bufsize = hw->samples << hw->info.shift;
415 err = ioctl (oss->fd, SNDCTL_DSP_GETOPTR, &cntinfo);
417 oss_logerr (errno, "SNDCTL_DSP_GETOPTR failed\n");
421 pos = hw->rpos << hw->info.shift;
422 bytes = audio_ring_dist (cntinfo.ptr, pos, bufsize);
423 decr = audio_MIN (bytes >> hw->info.shift, live);
426 err = ioctl (oss->fd, SNDCTL_DSP_GETOSPACE, &abinfo);
428 oss_logerr (errno, "SNDCTL_DSP_GETOPTR failed\n");
432 if (abinfo.bytes > bufsize) {
434 dolog ("warning: Invalid available size, size=%d bufsize=%d\n"
435 "please report your OS/audio hw to av1474@comtv.ru\n",
436 abinfo.bytes, bufsize);
438 abinfo.bytes = bufsize;
441 if (abinfo.bytes < 0) {
443 dolog ("warning: Invalid available size, size=%d bufsize=%d\n",
444 abinfo.bytes, bufsize);
449 decr = audio_MIN (abinfo.bytes >> hw->info.shift, live);
455 decr = audio_pcm_hw_clip_out (hw, oss->pcm_buf, decr, oss->pending);
456 oss->pending += decr;
457 oss_write_pending (oss);
462 static void oss_fini_out (HWVoiceOut *hw)
465 OSSVoiceOut *oss = (OSSVoiceOut *) hw;
467 ldebug ("oss_fini\n");
468 oss_anal_close (&oss->fd);
472 err = munmap (oss->pcm_buf, hw->samples << hw->info.shift);
474 oss_logerr (errno, "Failed to unmap buffer %p, size %d\n",
475 oss->pcm_buf, hw->samples << hw->info.shift);
479 qemu_free (oss->pcm_buf);
485 static int oss_init_out (HWVoiceOut *hw, struct audsettings *as)
487 OSSVoiceOut *oss = (OSSVoiceOut *) hw;
488 struct oss_params req, obt;
492 audfmt_e effective_fmt;
493 struct audsettings obt_as;
497 req.fmt = aud_to_ossfmt (as->fmt);
499 req.nchannels = as->nchannels;
500 req.fragsize = conf.fragsize;
501 req.nfrags = conf.nfrags;
503 if (oss_open (0, &req, &obt, &fd)) {
507 err = oss_to_audfmt (obt.fmt, &effective_fmt, &endianness);
509 oss_anal_close (&fd);
513 obt_as.freq = obt.freq;
514 obt_as.nchannels = obt.nchannels;
515 obt_as.fmt = effective_fmt;
516 obt_as.endianness = endianness;
518 audio_pcm_init_info (&hw->info, &obt_as);
519 oss->nfrags = obt.nfrags;
520 oss->fragsize = obt.fragsize;
522 if (obt.nfrags * obt.fragsize & hw->info.align) {
523 dolog ("warning: Misaligned DAC buffer, size %d, alignment %d\n",
524 obt.nfrags * obt.fragsize, hw->info.align + 1);
527 hw->samples = (obt.nfrags * obt.fragsize) >> hw->info.shift;
531 oss->pcm_buf = mmap (
533 hw->samples << hw->info.shift,
534 PROT_READ | PROT_WRITE,
539 if (oss->pcm_buf == MAP_FAILED) {
540 oss_logerr (errno, "Failed to map %d bytes of DAC\n",
541 hw->samples << hw->info.shift);
546 if (ioctl (fd, SNDCTL_DSP_SETTRIGGER, &trig) < 0) {
547 oss_logerr (errno, "SNDCTL_DSP_SETTRIGGER 0 failed\n");
550 trig = PCM_ENABLE_OUTPUT;
551 if (ioctl (fd, SNDCTL_DSP_SETTRIGGER, &trig) < 0) {
554 "SNDCTL_DSP_SETTRIGGER PCM_ENABLE_OUTPUT failed\n"
563 err = munmap (oss->pcm_buf, hw->samples << hw->info.shift);
565 oss_logerr (errno, "Failed to unmap buffer %p size %d\n",
566 oss->pcm_buf, hw->samples << hw->info.shift);
573 oss->pcm_buf = audio_calloc (
580 "Could not allocate DAC buffer (%d samples, each %d bytes)\n",
584 oss_anal_close (&fd);
593 static int oss_ctl_out (HWVoiceOut *hw, int cmd, ...)
596 OSSVoiceOut *oss = (OSSVoiceOut *) hw;
605 poll_mode = va_arg (ap, int);
608 ldebug ("enabling voice\n");
609 if (poll_mode && oss_poll_out (hw)) {
612 hw->poll_mode = poll_mode;
618 audio_pcm_info_clear_buf (&hw->info, oss->pcm_buf, hw->samples);
619 trig = PCM_ENABLE_OUTPUT;
620 if (ioctl (oss->fd, SNDCTL_DSP_SETTRIGGER, &trig) < 0) {
623 "SNDCTL_DSP_SETTRIGGER PCM_ENABLE_OUTPUT failed\n"
632 qemu_set_fd_handler (oss->fd, NULL, NULL, NULL);
640 ldebug ("disabling voice\n");
642 if (ioctl (oss->fd, SNDCTL_DSP_SETTRIGGER, &trig) < 0) {
643 oss_logerr (errno, "SNDCTL_DSP_SETTRIGGER 0 failed\n");
651 static int oss_init_in (HWVoiceIn *hw, struct audsettings *as)
653 OSSVoiceIn *oss = (OSSVoiceIn *) hw;
654 struct oss_params req, obt;
658 audfmt_e effective_fmt;
659 struct audsettings obt_as;
663 req.fmt = aud_to_ossfmt (as->fmt);
665 req.nchannels = as->nchannels;
666 req.fragsize = conf.fragsize;
667 req.nfrags = conf.nfrags;
668 if (oss_open (1, &req, &obt, &fd)) {
672 err = oss_to_audfmt (obt.fmt, &effective_fmt, &endianness);
674 oss_anal_close (&fd);
678 obt_as.freq = obt.freq;
679 obt_as.nchannels = obt.nchannels;
680 obt_as.fmt = effective_fmt;
681 obt_as.endianness = endianness;
683 audio_pcm_init_info (&hw->info, &obt_as);
684 oss->nfrags = obt.nfrags;
685 oss->fragsize = obt.fragsize;
687 if (obt.nfrags * obt.fragsize & hw->info.align) {
688 dolog ("warning: Misaligned ADC buffer, size %d, alignment %d\n",
689 obt.nfrags * obt.fragsize, hw->info.align + 1);
692 hw->samples = (obt.nfrags * obt.fragsize) >> hw->info.shift;
693 oss->pcm_buf = audio_calloc (AUDIO_FUNC, hw->samples, 1 << hw->info.shift);
695 dolog ("Could not allocate ADC buffer (%d samples, each %d bytes)\n",
696 hw->samples, 1 << hw->info.shift);
697 oss_anal_close (&fd);
705 static void oss_fini_in (HWVoiceIn *hw)
707 OSSVoiceIn *oss = (OSSVoiceIn *) hw;
709 oss_anal_close (&oss->fd);
712 qemu_free (oss->pcm_buf);
717 static int oss_run_in (HWVoiceIn *hw)
719 OSSVoiceIn *oss = (OSSVoiceIn *) hw;
720 int hwshift = hw->info.shift;
722 int live = audio_pcm_hw_get_live_in (hw);
723 int dead = hw->samples - live;
724 size_t read_samples = 0;
729 { .add = hw->wpos, .len = 0 },
730 { .add = 0, .len = 0 }
737 if (hw->wpos + dead > hw->samples) {
738 bufs[0].len = (hw->samples - hw->wpos) << hwshift;
739 bufs[1].len = (dead - (hw->samples - hw->wpos)) << hwshift;
742 bufs[0].len = dead << hwshift;
745 for (i = 0; i < 2; ++i) {
749 void *p = advance (oss->pcm_buf, bufs[i].add << hwshift);
750 nread = read (oss->fd, p, bufs[i].len);
753 if (nread & hw->info.align) {
754 dolog ("warning: Misaligned read %zd (requested %d), "
755 "alignment %d\n", nread, bufs[i].add << hwshift,
758 read_samples += nread >> hwshift;
759 hw->conv (hw->conv_buf + bufs[i].add, p, nread >> hwshift,
763 if (bufs[i].len - nread) {
772 "Failed to read %d bytes of audio (to %p)\n",
783 hw->wpos = (hw->wpos + read_samples) % hw->samples;
787 static int oss_read (SWVoiceIn *sw, void *buf, int size)
789 return audio_pcm_sw_read (sw, buf, size);
792 static int oss_ctl_in (HWVoiceIn *hw, int cmd, ...)
794 OSSVoiceIn *oss = (OSSVoiceIn *) hw;
803 poll_mode = va_arg (ap, int);
806 if (poll_mode && oss_poll_in (hw)) {
809 hw->poll_mode = poll_mode;
816 qemu_set_fd_handler (oss->fd, NULL, NULL, NULL);
823 static void *oss_audio_init (void)
828 static void oss_audio_fini (void *opaque)
833 static struct audio_option oss_options[] = {
837 .valp = &conf.fragsize,
838 .descr = "Fragment size in bytes"
843 .valp = &conf.nfrags,
844 .descr = "Number of fragments"
849 .valp = &conf.try_mmap,
850 .descr = "Try using memory mapped access"
855 .valp = &conf.devpath_out,
856 .descr = "Path to DAC device"
861 .valp = &conf.devpath_in,
862 .descr = "Path to ADC device"
867 .valp = &conf.exclusive,
868 .descr = "Open device in exclusive mode (vmix wont work)"
870 #ifdef USE_DSP_POLICY
874 .valp = &conf.policy,
875 .descr = "Set the timing policy of the device, -1 to use fragment mode",
882 .descr = "Turn on some debugging messages"
884 { /* End of list */ }
887 static struct audio_pcm_ops oss_pcm_ops = {
888 .init_out = oss_init_out,
889 .fini_out = oss_fini_out,
890 .run_out = oss_run_out,
892 .ctl_out = oss_ctl_out,
894 .init_in = oss_init_in,
895 .fini_in = oss_fini_in,
896 .run_in = oss_run_in,
901 struct audio_driver oss_audio_driver = {
903 .descr = "OSS http://www.opensound.com",
904 .options = oss_options,
905 .init = oss_audio_init,
906 .fini = oss_audio_fini,
907 .pcm_ops = &oss_pcm_ops,
909 .max_voices_out = INT_MAX,
910 .max_voices_in = INT_MAX,
911 .voice_size_out = sizeof (OSSVoiceOut),
912 .voice_size_in = sizeof (OSSVoiceIn)