21 #define __STDC_FORMAT_MACROS // For inttypes.h to work in C++
32 #include <sys/types.h>
36 #include "JackAlsaDriver.h"
37 #include "JackEngineControl.h"
38 #include "JackClientControl.h"
40 #include "JackGraphManager.h"
41 #include "JackLockedEngine.h"
43 #include "JackAndroidThread.h"
45 #include "JackPosixThread.h"
47 #include "JackCompilerDeps.h"
48 #include "JackServerGlobals.h"
52 {
"none",
"no MIDI driver" },
53 {
"seq",
"ALSA Sequencer driver" },
54 {
"raw",
"ALSA RawMIDI driver" },
61 {
'r',
"rectangular" },
63 {
't',
"triangular" },
70 int JackAlsaDriver::SetBufferSize(jack_nframes_t buffer_size)
72 jack_log(
"JackAlsaDriver::SetBufferSize %ld", buffer_size);
73 int res = alsa_driver_reset_parameters((
alsa_driver_t *)fDriver, buffer_size,
78 JackAudioDriver::SetBufferSize(buffer_size);
83 alsa_driver_reset_parameters((
alsa_driver_t *)fDriver, fEngineControl->fBufferSize,
91 void JackAlsaDriver::UpdateLatencies()
96 for (
int i = 0; i < fCaptureChannels; i++) {
97 range.
min = range.
max = alsa_driver->frames_per_cycle + alsa_driver->capture_frame_latency;
98 fGraphManager->GetPort(fCapturePortList[i])->SetLatencyRange(JackCaptureLatency, &range);
101 for (
int i = 0; i < fPlaybackChannels; i++) {
103 range.
min = range.
max = (alsa_driver->frames_per_cycle * (alsa_driver->user_nperiods - 1)) +
104 ((fEngineControl->fSyncMode) ? 0 : fEngineControl->fBufferSize) + alsa_driver->playback_frame_latency;
105 fGraphManager->GetPort(fPlaybackPortList[i])->SetLatencyRange(JackPlaybackLatency, &range);
107 if (fWithMonitorPorts) {
108 range.
min = range.
max = alsa_driver->frames_per_cycle;
109 fGraphManager->GetPort(fMonitorPortList[i])->SetLatencyRange(JackCaptureLatency, &range);
114 int JackAlsaDriver::Attach()
117 jack_port_id_t port_index;
118 unsigned long port_flags = (
unsigned long)CaptureDriverFlags;
119 char name[REAL_JACK_PORT_NAME_SIZE];
120 char alias[REAL_JACK_PORT_NAME_SIZE];
122 assert(fCaptureChannels < DRIVER_PORT_NUM);
123 assert(fPlaybackChannels < DRIVER_PORT_NUM);
127 if (alsa_driver->has_hw_monitoring)
128 port_flags |= JackPortCanMonitor;
131 JackAudioDriver::SetBufferSize(alsa_driver->frames_per_cycle);
132 JackAudioDriver::SetSampleRate(alsa_driver->frame_rate);
134 jack_log(
"JackAlsaDriver::Attach fBufferSize %ld fSampleRate %ld", fEngineControl->fBufferSize, fEngineControl->fSampleRate);
136 for (
int i = 0; i < fCaptureChannels; i++) {
137 snprintf(alias,
sizeof(alias),
"%s:%s:out%d", fAliasName, fCaptureDriverName, i + 1);
138 snprintf(name,
sizeof(name),
"%s:capture_%d", fClientControl.fName, i + 1);
139 if (fEngine->PortRegister(fClientControl.fRefNum, name, JACK_DEFAULT_AUDIO_TYPE, (JackPortFlags)port_flags, fEngineControl->fBufferSize, &port_index) < 0) {
140 jack_error(
"driver: cannot register port for %s", name);
143 port = fGraphManager->GetPort(port_index);
144 port->SetAlias(alias);
145 fCapturePortList[i] = port_index;
146 jack_log(
"JackAlsaDriver::Attach fCapturePortList[i] %ld ", port_index);
149 port_flags = (
unsigned long)PlaybackDriverFlags;
151 for (
int i = 0; i < fPlaybackChannels; i++) {
152 snprintf(alias,
sizeof(alias),
"%s:%s:in%d", fAliasName, fPlaybackDriverName, i + 1);
153 snprintf(name,
sizeof(name),
"%s:playback_%d", fClientControl.fName, i + 1);
154 if (fEngine->PortRegister(fClientControl.fRefNum, name, JACK_DEFAULT_AUDIO_TYPE, (JackPortFlags)port_flags, fEngineControl->fBufferSize, &port_index) < 0) {
155 jack_error(
"driver: cannot register port for %s", name);
158 port = fGraphManager->GetPort(port_index);
159 port->SetAlias(alias);
160 fPlaybackPortList[i] = port_index;
161 jack_log(
"JackAlsaDriver::Attach fPlaybackPortList[i] %ld ", port_index);
164 if (fWithMonitorPorts) {
166 snprintf(name,
sizeof(name),
"%s:monitor_%d", fClientControl.fName, i + 1);
167 if (fEngine->PortRegister(fClientControl.fRefNum, name, JACK_DEFAULT_AUDIO_TYPE, MonitorDriverFlags, fEngineControl->fBufferSize, &port_index) < 0) {
168 jack_error(
"ALSA: cannot register monitor port for %s", name);
170 fMonitorPortList[i] = port_index;
177 if (alsa_driver->midi) {
178 int err = (alsa_driver->midi->attach)(alsa_driver->midi);
180 jack_error (
"ALSA: cannot attach MIDI: %d", err);
186 int JackAlsaDriver::Detach()
189 if (alsa_driver->midi)
190 (alsa_driver->midi->detach)(alsa_driver->midi);
192 return JackAudioDriver::Detach();
195 extern "C" char* get_control_device_name(
const char * device_name)
204 if (strncasecmp(device_name,
"plughw:", 7) == 0) {
209 comma = strchr(device_name,
',');
211 ctl_name = strdup(device_name);
212 if (ctl_name == NULL) {
213 jack_error(
"strdup(\"%s\") failed.", device_name);
216 ctl_name = strndup(device_name, comma - device_name);
217 if (ctl_name == NULL) {
218 jack_error(
"strndup(\"%s\", %u) failed.", device_name, (
unsigned int)(comma - device_name));
225 static int card_to_num(
const char* device)
229 snd_ctl_card_info_t *card_info;
230 snd_ctl_t* ctl_handle;
233 snd_ctl_card_info_alloca (&card_info);
235 ctl_name = get_control_device_name(device);
236 if (ctl_name == NULL) {
237 jack_error(
"get_control_device_name() failed.");
241 if ((err = snd_ctl_open (&ctl_handle, ctl_name, 0)) < 0) {
242 jack_error (
"control open \"%s\" (%s)", ctl_name,
247 if ((err = snd_ctl_card_info(ctl_handle, card_info)) < 0) {
248 jack_error (
"control hardware info \"%s\" (%s)",
249 device, snd_strerror (err));
253 i = snd_ctl_card_info_get_card(card_info);
256 snd_ctl_close(ctl_handle);
265 int JackAlsaDriver::Open(jack_nframes_t nframes,
266 jack_nframes_t user_nperiods,
267 jack_nframes_t samplerate,
272 DitherAlgorithm dither,
278 const char* capture_driver_name,
279 const char* playback_driver_name,
280 jack_nframes_t capture_latency,
281 jack_nframes_t playback_latency,
282 const char* midi_driver_name)
285 if (JackAudioDriver::Open(nframes, samplerate, capturing, playing,
286 inchannels, outchannels, monitor, capture_driver_name, playback_driver_name,
287 capture_latency, playback_latency) != 0) {
293 if (strcmp(midi_driver_name,
"seq") == 0)
294 midi = alsa_seqmidi_new((jack_client_t*)
this, 0);
295 else if (strcmp(midi_driver_name,
"raw") == 0)
296 midi = alsa_rawmidi_new((jack_client_t*)
this);
299 if (JackServerGlobals::on_device_acquire != NULL) {
300 int capture_card = card_to_num(capture_driver_name);
301 int playback_card = card_to_num(playback_driver_name);
304 if (capture_card >= 0) {
305 snprintf(audio_name,
sizeof(audio_name),
"Audio%d", capture_card);
306 if (!JackServerGlobals::on_device_acquire(audio_name)) {
307 jack_error(
"Audio device %s cannot be acquired...", capture_driver_name);
312 if (playback_card >= 0 && playback_card != capture_card) {
313 snprintf(audio_name,
sizeof(audio_name),
"Audio%d", playback_card);
314 if (!JackServerGlobals::on_device_acquire(audio_name)) {
315 jack_error(
"Audio device %s cannot be acquired...", playback_driver_name);
316 if (capture_card >= 0) {
317 snprintf(audio_name,
sizeof(audio_name),
"Audio%d", capture_card);
318 JackServerGlobals::on_device_release(audio_name);
325 fDriver = alsa_driver_new ((
char*)
"alsa_pcm", (
char*)playback_driver_name, (
char*)capture_driver_name,
345 fCaptureChannels = ((
alsa_driver_t *)fDriver)->capture_nchannels;
346 fPlaybackChannels = ((
alsa_driver_t *)fDriver)->playback_nchannels;
349 JackAudioDriver::Close();
354 int JackAlsaDriver::Close()
357 int res = JackAudioDriver::Close();
361 if (JackServerGlobals::on_device_release != NULL)
364 int capture_card = card_to_num(fCaptureDriverName);
365 if (capture_card >= 0) {
366 snprintf(audio_name,
sizeof(audio_name),
"Audio%d", capture_card);
367 JackServerGlobals::on_device_release(audio_name);
370 int playback_card = card_to_num(fPlaybackDriverName);
371 if (playback_card >= 0 && playback_card != capture_card) {
372 snprintf(audio_name,
sizeof(audio_name),
"Audio%d", playback_card);
373 JackServerGlobals::on_device_release(audio_name);
380 int JackAlsaDriver::Start()
382 int res = JackAudioDriver::Start();
386 JackAudioDriver::Stop();
392 int JackAlsaDriver::Stop()
395 if (JackAudioDriver::Stop() < 0) {
401 int JackAlsaDriver::Read()
405 jack_nframes_t nframes;
410 nframes = alsa_driver_wait((
alsa_driver_t *)fDriver, -1, &wait_status, &fDelayedUsecs);
419 jack_log(
"ALSA XRun wait_status = %d", wait_status);
420 NotifyXRun(fBeginDateUst, fDelayedUsecs);
424 if (nframes != fEngineControl->fBufferSize)
425 jack_log(
"JackAlsaDriver::Read warning fBufferSize = %ld nframes = %ld", fEngineControl->fBufferSize, nframes);
428 JackDriver::CycleIncTime();
430 return alsa_driver_read((
alsa_driver_t *)fDriver, fEngineControl->fBufferSize);
433 int JackAlsaDriver::Write()
435 return alsa_driver_write((
alsa_driver_t *)fDriver, fEngineControl->fBufferSize);
438 void JackAlsaDriver::ReadInputAux(jack_nframes_t orig_nframes, snd_pcm_sframes_t contiguous, snd_pcm_sframes_t nread)
440 for (
int chn = 0; chn < fCaptureChannels; chn++) {
441 if (fGraphManager->GetConnectionsNum(fCapturePortList[chn]) > 0) {
442 jack_default_audio_sample_t* buf = (jack_default_audio_sample_t*)fGraphManager->GetBuffer(fCapturePortList[chn], orig_nframes);
443 alsa_driver_read_from_channel((
alsa_driver_t *)fDriver, chn, buf + nread, contiguous);
448 void JackAlsaDriver::MonitorInputAux()
450 for (
int chn = 0; chn < fCaptureChannels; chn++) {
451 JackPort* port = fGraphManager->GetPort(fCapturePortList[chn]);
452 if (port->MonitoringInput()) {
453 ((
alsa_driver_t *)fDriver)->input_monitor_mask |= (1 << chn);
458 void JackAlsaDriver::ClearOutputAux()
460 for (
int chn = 0; chn < fPlaybackChannels; chn++) {
461 jack_default_audio_sample_t* buf =
462 (jack_default_audio_sample_t*)fGraphManager->GetBuffer(fPlaybackPortList[chn], fEngineControl->fBufferSize);
463 memset(buf, 0,
sizeof (jack_default_audio_sample_t) * fEngineControl->fBufferSize);
467 void JackAlsaDriver::SetTimetAux(jack_time_t time)
469 fBeginDateUst = time;
472 void JackAlsaDriver::WriteOutputAux(jack_nframes_t orig_nframes, snd_pcm_sframes_t contiguous, snd_pcm_sframes_t nwritten)
474 for (
int chn = 0; chn < fPlaybackChannels; chn++) {
476 if (fGraphManager->GetConnectionsNum(fPlaybackPortList[chn]) > 0) {
477 jack_default_audio_sample_t* buf = (jack_default_audio_sample_t*)fGraphManager->GetBuffer(fPlaybackPortList[chn], orig_nframes);
478 alsa_driver_write_to_channel(((
alsa_driver_t *)fDriver), chn, buf + nwritten, contiguous);
480 if (fWithMonitorPorts && fGraphManager->GetConnectionsNum(fMonitorPortList[chn]) > 0) {
481 jack_default_audio_sample_t* monbuf = (jack_default_audio_sample_t*)fGraphManager->GetBuffer(fMonitorPortList[chn], orig_nframes);
482 memcpy(monbuf + nwritten, buf + nwritten, contiguous *
sizeof(jack_default_audio_sample_t));
488 int JackAlsaDriver::is_realtime()
const
490 return fEngineControl->fRealTime;
493 int JackAlsaDriver::create_thread(pthread_t *thread,
int priority,
int realtime,
void *(*start_routine)(
void*),
void *arg)
496 return JackAndroidThread::StartImp(thread, priority, realtime, start_routine, arg);
498 return JackPosixThread::StartImp(thread, priority, realtime, start_routine, arg);
502 jack_port_id_t JackAlsaDriver::port_register(
const char *port_name,
const char *port_type,
unsigned long flags,
unsigned long buffer_size)
504 jack_port_id_t port_index;
505 int res = fEngine->PortRegister(fClientControl.fRefNum, port_name, port_type, flags, buffer_size, &port_index);
506 return (res == 0) ? port_index : 0;
509 int JackAlsaDriver::port_unregister(jack_port_id_t port_index)
511 return fEngine->PortUnRegister(fClientControl.fRefNum, port_index);
514 void* JackAlsaDriver::port_get_buffer(
int port, jack_nframes_t nframes)
516 return fGraphManager->GetBuffer(port, nframes);
519 int JackAlsaDriver::port_set_alias(
int port,
const char* name)
521 return fGraphManager->GetPort(port)->SetAlias(name);
524 jack_nframes_t JackAlsaDriver::get_sample_rate()
const
526 return fEngineControl->fSampleRate;
529 jack_nframes_t JackAlsaDriver::frame_time()
const
532 fEngineControl->ReadFrameTime(&timer);
533 return timer.Time2Frames(GetMicroSeconds(), fEngineControl->fBufferSize);
536 jack_nframes_t JackAlsaDriver::last_frame_time()
const
539 fEngineControl->ReadFrameTime(&timer);
540 return timer.CurFrame();
556 snd_ctl_card_info_t * info;
557 snd_pcm_info_t * pcminfo_capture;
558 snd_pcm_info_t * pcminfo_playback;
562 char description[64];
567 uint32_t array_size = 0;
569 snd_ctl_card_info_alloca(&info);
570 snd_pcm_info_alloca(&pcminfo_capture);
571 snd_pcm_info_alloca(&pcminfo_playback);
573 constraint_ptr = NULL;
575 while(snd_card_next(&card_no) >= 0 && card_no >= 0)
577 snprintf(card_id.str,
sizeof(card_id.str),
"hw:%d", card_no);
579 if (snd_ctl_open(&handle, card_id.str, 0) >= 0 &&
580 snd_ctl_card_info(handle, info) >= 0)
582 snprintf(card_id.str,
sizeof(card_id.str),
"hw:%s", snd_ctl_card_info_get_id(info));
583 if (!jack_constraint_add_enum(
587 snd_ctl_card_info_get_name(info)))
592 while (snd_ctl_pcm_next_device(handle, &device_no) >= 0 && device_no != -1)
594 snprintf(device_id.str,
sizeof(device_id.str),
"%s,%d", card_id.str, device_no);
596 snd_pcm_info_set_device(pcminfo_capture, device_no);
597 snd_pcm_info_set_subdevice(pcminfo_capture, 0);
598 snd_pcm_info_set_stream(pcminfo_capture, SND_PCM_STREAM_CAPTURE);
599 has_capture = snd_ctl_pcm_info(handle, pcminfo_capture) >= 0;
601 snd_pcm_info_set_device(pcminfo_playback, device_no);
602 snd_pcm_info_set_subdevice(pcminfo_playback, 0);
603 snd_pcm_info_set_stream(pcminfo_playback, SND_PCM_STREAM_PLAYBACK);
604 has_playback = snd_ctl_pcm_info(handle, pcminfo_playback) >= 0;
606 if (has_capture && has_playback)
608 snprintf(description,
sizeof(description),
"%s (duplex)", snd_pcm_info_get_name(pcminfo_capture));
610 else if (has_capture)
612 snprintf(description,
sizeof(description),
"%s (capture)", snd_pcm_info_get_name(pcminfo_capture));
614 else if (has_playback)
616 snprintf(description,
sizeof(description),
"%s (playback)", snd_pcm_info_get_name(pcminfo_playback));
623 if (!jack_constraint_add_enum(
631 snd_ctl_close(handle);
635 return constraint_ptr;
637 jack_constraint_free(constraint_ptr);
642 dither_opt (
char c, DitherAlgorithm* dither)
651 *dither = Rectangular;
659 *dither = Triangular;
663 fprintf (stderr,
"ALSA driver: illegal dithering mode %c\n", c);
675 desc = jack_driver_descriptor_construct(
"alsa", JackDriverMaster,
"Linux ALSA API based audio backend", &filler);
677 strcpy(value.str,
"hw:0");
679 jack_driver_descriptor_add_parameter(desc, &filler,
"device",
'd', JackDriverParamString, &value, NULL,
"ALSA device name", NULL);
681 jack_driver_descriptor_add_parameter(desc, &filler,
"device",
'd', JackDriverParamString, &value, enum_alsa_devices(),
"ALSA device name", NULL);
684 strcpy(value.str,
"none");
685 jack_driver_descriptor_add_parameter(desc, &filler,
"capture",
'C', JackDriverParamString, &value, NULL,
"Provide capture ports. Optionally set device", NULL);
686 jack_driver_descriptor_add_parameter(desc, &filler,
"playback",
'P', JackDriverParamString, &value, NULL,
"Provide playback ports. Optionally set device", NULL);
689 jack_driver_descriptor_add_parameter(desc, &filler,
"rate",
'r', JackDriverParamUInt, &value, NULL,
"Sample rate", NULL);
692 jack_driver_descriptor_add_parameter(desc, &filler,
"period",
'p', JackDriverParamUInt, &value, NULL,
"Frames per period", NULL);
695 jack_driver_descriptor_add_parameter(desc, &filler,
"nperiods",
'n', JackDriverParamUInt, &value, NULL,
"Number of periods of playback latency", NULL);
698 jack_driver_descriptor_add_parameter(desc, &filler,
"hwmon",
'H', JackDriverParamBool, &value, NULL,
"Hardware monitoring, if available", NULL);
701 jack_driver_descriptor_add_parameter(desc, &filler,
"hwmeter",
'M', JackDriverParamBool, &value, NULL,
"Hardware metering, if available", NULL);
704 jack_driver_descriptor_add_parameter(desc, &filler,
"duplex",
'D', JackDriverParamBool, &value, NULL,
"Provide both capture and playback ports", NULL);
707 jack_driver_descriptor_add_parameter(desc, &filler,
"softmode",
's', JackDriverParamBool, &value, NULL,
"Soft-mode, no xrun handling", NULL);
710 jack_driver_descriptor_add_parameter(desc, &filler,
"monitor",
'm', JackDriverParamBool, &value, NULL,
"Provide monitor ports for the output", NULL);
713 jack_driver_descriptor_add_parameter(
720 jack_constraint_compose_enum_char(
721 JACK_CONSTRAINT_FLAG_STRICT | JACK_CONSTRAINT_FLAG_FAKE_VALUE,
722 dither_constraint_descr_array),
727 jack_driver_descriptor_add_parameter(desc, &filler,
"inchannels",
'i', JackDriverParamUInt, &value, NULL,
"Number of capture channels (defaults to hardware max)", NULL);
728 jack_driver_descriptor_add_parameter(desc, &filler,
"outchannels",
'o', JackDriverParamUInt, &value, NULL,
"Number of playback channels (defaults to hardware max)", NULL);
731 jack_driver_descriptor_add_parameter(desc, &filler,
"shorts",
'S', JackDriverParamBool, &value, NULL,
"Try 16-bit samples before 32-bit", NULL);
734 jack_driver_descriptor_add_parameter(desc, &filler,
"input-latency",
'I', JackDriverParamUInt, &value, NULL,
"Extra input latency (frames)", NULL);
735 jack_driver_descriptor_add_parameter(desc, &filler,
"output-latency",
'O', JackDriverParamUInt, &value, NULL,
"Extra output latency (frames)", NULL);
737 strcpy(value.str,
"none");
738 jack_driver_descriptor_add_parameter(
743 JackDriverParamString,
745 jack_constraint_compose_enum_str(
746 JACK_CONSTRAINT_FLAG_STRICT | JACK_CONSTRAINT_FLAG_FAKE_VALUE,
747 midi_constraint_descr_array),
758 jack_nframes_t srate = 48000;
759 jack_nframes_t frames_per_interrupt = 1024;
760 unsigned long user_nperiods = 2;
761 const char *playback_pcm_name =
"hw:0";
762 const char *capture_pcm_name =
"hw:0";
763 int hw_monitoring = FALSE;
764 int hw_metering = FALSE;
766 int playback = FALSE;
767 int soft_mode = FALSE;
769 DitherAlgorithm dither = None;
770 int user_capture_nchnls = 0;
771 int user_playback_nchnls = 0;
772 int shorts_first = FALSE;
773 jack_nframes_t systemic_input_latency = 0;
774 jack_nframes_t systemic_output_latency = 0;
777 const char *midi_driver =
"none";
779 for (node = params; node; node = jack_slist_next (node)) {
782 switch (param->character) {
786 if (strcmp (param->value.str,
"none") != 0) {
787 capture_pcm_name = strdup (param->value.str);
788 jack_log(
"capture device %s", capture_pcm_name);
794 if (strcmp (param->value.str,
"none") != 0) {
795 playback_pcm_name = strdup (param->value.str);
796 jack_log(
"playback device %s", playback_pcm_name);
806 if (strcmp (param->value.str,
"none") != 0) {
807 playback_pcm_name = strdup (param->value.str);
808 capture_pcm_name = strdup (param->value.str);
809 jack_log(
"playback device %s", playback_pcm_name);
810 jack_log(
"capture device %s", capture_pcm_name);
815 hw_monitoring = param->value.i;
819 monitor = param->value.i;
823 hw_metering = param->value.i;
827 srate = param->value.ui;
828 jack_log(
"apparent rate = %d", srate);
832 frames_per_interrupt = param->value.ui;
833 jack_log(
"frames per period = %d", frames_per_interrupt);
837 user_nperiods = param->value.ui;
838 if (user_nperiods < 2) {
844 soft_mode = param->value.i;
848 if (dither_opt (param->value.c, &dither)) {
854 user_capture_nchnls = param->value.ui;
858 user_playback_nchnls = param->value.ui;
862 shorts_first = param->value.i;
866 systemic_input_latency = param->value.ui;
870 systemic_output_latency = param->value.ui;
874 midi_driver = strdup(param->value.str);
880 if (!capture && !playback) {
888 if (g_alsa_driver->Open(frames_per_interrupt, user_nperiods, srate, hw_monitoring, hw_metering, capture, playback, dither, soft_mode, monitor,
889 user_capture_nchnls, user_playback_nchnls, shorts_first, capture_pcm_name, playback_pcm_name,
890 systemic_input_latency, systemic_output_latency, midi_driver) == 0) {
891 return threaded_driver;
893 delete threaded_driver;
900 void ReadInput(jack_nframes_t orig_nframes, snd_pcm_sframes_t contiguous, snd_pcm_sframes_t nread)
902 g_alsa_driver->ReadInputAux(orig_nframes, contiguous, nread);
906 g_alsa_driver->MonitorInputAux();
910 g_alsa_driver->ClearOutputAux();
912 void WriteOutput(jack_nframes_t orig_nframes, snd_pcm_sframes_t contiguous, snd_pcm_sframes_t nwritten)
914 g_alsa_driver->WriteOutputAux(orig_nframes, contiguous, nwritten);
916 void SetTime(jack_time_t time)
918 g_alsa_driver->SetTimetAux(time);
924 if ((res = g_alsa_driver->Stop()) == 0) {
925 res = g_alsa_driver->Start();