// I/O error handler
static void xrun(void)
{
snd_pcm_status_t *status;
int res;
snd_pcm_status_alloca(&status);
if ((res = snd_pcm_status(handle, status))<0) {
error(_("status error: %s"), snd_strerror(res));
exit(EXIT_FAILURE);
}
if (snd_pcm_status_get_state(status) == SND_PCM_STATE_XRUN) {
struct timeval now, diff, tstamp;
gettimeofday(&now, 0);
snd_pcm_status_get_trigger_tstamp(status, &tstamp);
timersub(&now, &tstamp, &diff);
fprintf(stderr, _("%s!!! (at least %.3f ms long)\n"),
stream == SND_PCM_STREAM_PLAYBACK ? _("underrun") : _("overrun"),
diff.tv_sec * 1000 + diff.tv_usec / 1000.0);
if ((res = snd_pcm_prepare(handle))<0) {
error(_("xrun: prepare error: %s"), snd_strerror(res));
exit(EXIT_FAILURE);
}
return; // ok, data should be accepted again
} if (snd_pcm_status_get_state(status) == SND_PCM_STATE_DRAINING) {
}
error(_("read/write error, state = %s"), snd_pcm_state_name(snd_pcm_status_get_state(status)));
exit(EXIT_FAILURE);
}
// TODO first frame causes broken pipe (underrun) because not enough data is sent
// we should wait until the handle is ready
void
AlsaLayer::write(SFLAudioSample* buffer, int frames, snd_pcm_t * handle)
{
// Skip empty buffers
if (!frames)
return;
int err = snd_pcm_writei(handle, (const void*)buffer, frames);
if (err < 0)
snd_pcm_recover(handle, err, 0);
if (err >= 0)
return;
switch (err) {
case -EPIPE:
case -ESTRPIPE:
case -EIO: {
snd_pcm_status_t* status;
snd_pcm_status_alloca(&status);
if (ALSA_CALL(snd_pcm_status(handle, status), "Cannot get playback handle status") >= 0)
if (snd_pcm_status_get_state(status) == SND_PCM_STATE_XRUN) {
stopPlaybackStream();
preparePlaybackStream();
startPlaybackStream();
}
ALSA_CALL(snd_pcm_writei(handle, (const void*)buffer, frames), "XRUN handling failed");
break;
}
case -EBADFD: {
snd_pcm_status_t* status;
snd_pcm_status_alloca(&status);
if (ALSA_CALL(snd_pcm_status(handle, status), "Cannot get playback handle status") >= 0) {
if (snd_pcm_status_get_state(status) == SND_PCM_STATE_SETUP) {
ERROR("Writing in state SND_PCM_STATE_SETUP, should be "
"SND_PCM_STATE_PREPARED or SND_PCM_STATE_RUNNING");
int error = snd_pcm_prepare(handle);
if (error < 0) {
ERROR("Failed to prepare handle: %s", snd_strerror(error));
stopPlaybackStream();
}
}
}
break;
}
default:
ERROR("Unknown write error, dropping frames: %s", snd_strerror(err));
stopPlaybackStream();
break;
}
}
static void
xrun(void)
{
snd_pcm_status_t *status;
int res;
snd_pcm_status_alloca(&status);
if ((res = snd_pcm_status(AHandle, status)) < 0) {
fprintf(stderr, "status error: %s", snd_strerror(res));
exit(EXIT_FAILURE);
}
if (snd_pcm_status_get_state(status) == SND_PCM_STATE_XRUN) {
struct timeval now,
diff,
tstamp;
gettimeofday(&now, 0);
snd_pcm_status_get_trigger_tstamp(status, &tstamp);
timersub(&now, &tstamp, &diff);
fprintf(stderr, "Underrun!!! (at least %.3f ms long)\n",
diff.tv_sec * 1000 + diff.tv_usec / 1000.0);
if ((res = snd_pcm_prepare(AHandle)) < 0) {
fprintf(stderr, "xrun: prepare error: %s", snd_strerror(res));
exit(EXIT_FAILURE);
}
return; // ok, data should be accepted
// again
}
fprintf(stderr, "read/write error, state = %s",
snd_pcm_state_name(snd_pcm_status_get_state(status)));
exit(EXIT_FAILURE);
}
/* I/O error handler */
static void xrun(void)
{
snd_pcm_status_t *status;
int res;
snd_pcm_status_alloca(&status);
if ((res = snd_pcm_status(handle, status))<0) {
error("status error: %s", snd_strerror(res));
exit(EXIT_FAILURE);
}
if (snd_pcm_status_get_state(status) == SND_PCM_STATE_XRUN) {
struct timeval now, diff, tstamp;
gettimeofday(&now, 0);
snd_pcm_status_get_trigger_tstamp(status, &tstamp);
timersub(&now, &tstamp, &diff);
fprintf(stderr, "%s!!! (at least %.3f ms long)\n",
stream == SND_PCM_STREAM_PLAYBACK ? "underrun" : "overrun",
diff.tv_sec * 1000 + diff.tv_usec / 1000.0);
if (verbose) {
fprintf(stderr, "Status:\n");
snd_pcm_status_dump(status, log);
}
if ((res = snd_pcm_prepare(handle))<0) {
error("xrun: prepare error: %s", snd_strerror(res));
exit(EXIT_FAILURE);
}
return; /* ok, data should be accepted again */
} if (snd_pcm_status_get_state(status) == SND_PCM_STATE_DRAINING) {
if (verbose) {
fprintf(stderr, "Status(DRAINING):\n");
snd_pcm_status_dump(status, log);
}
if (stream == SND_PCM_STREAM_CAPTURE) {
fprintf(stderr, "capture stream format change? attempting recover...\n");
if ((res = snd_pcm_prepare(handle))<0) {
error("xrun(DRAINING): prepare error: %s", snd_strerror(res));
exit(EXIT_FAILURE);
}
return;
}
}
if (verbose) {
fprintf(stderr, "Status(R/W):\n");
snd_pcm_status_dump(status, log);
}
error("read/write error, state = %s", snd_pcm_state_name(snd_pcm_status_get_state(status)));
exit(EXIT_FAILURE);
}
int ai_alsa_xrun(audio_in_t *ai)
{
snd_pcm_status_t *status;
int res;
snd_pcm_status_alloca(&status);
if ((res = snd_pcm_status(ai->alsa.handle, status))<0) {
mp_tmsg(MSGT_TV, MSGL_ERR, "ALSA status error: %s", snd_strerror(res));
return -1;
}
if (snd_pcm_status_get_state(status) == SND_PCM_STATE_XRUN) {
struct timeval now, diff, tstamp;
gettimeofday(&now, 0);
snd_pcm_status_get_trigger_tstamp(status, &tstamp);
timersub(&now, &tstamp, &diff);
mp_tmsg(MSGT_TV, MSGL_ERR, "ALSA xrun!!! (at least %.3f ms long)\n",
diff.tv_sec * 1000 + diff.tv_usec / 1000.0);
if (mp_msg_test(MSGT_TV, MSGL_V)) {
mp_tmsg(MSGT_TV, MSGL_ERR, "ALSA Status:\n");
snd_pcm_status_dump(status, ai->alsa.log);
}
if ((res = snd_pcm_prepare(ai->alsa.handle))<0) {
mp_tmsg(MSGT_TV, MSGL_ERR, "ALSA xrun: prepare error: %s", snd_strerror(res));
return -1;
}
return 0; /* ok, data should be accepted again */
}
mp_tmsg(MSGT_TV, MSGL_ERR, "ALSA read/write error");
return -1;
}
int ai_alsa_xrun(audio_in_t *ai)
{
snd_pcm_status_t *status;
int res;
snd_pcm_status_alloca(&status);
if ((res = snd_pcm_status(ai->alsa.handle, status))<0) {
mp_msg(MSGT_TV, MSGL_ERR, MSGTR_MPDEMUX_AIALSA_AlsaStatusError, snd_strerror(res));
return -1;
}
if (snd_pcm_status_get_state(status) == SND_PCM_STATE_XRUN) {
struct timeval now, diff, tstamp;
gettimeofday(&now, 0);
snd_pcm_status_get_trigger_tstamp(status, &tstamp);
timersub(&now, &tstamp, &diff);
mp_msg(MSGT_TV, MSGL_ERR, MSGTR_MPDEMUX_AIALSA_AlsaXRUN,
diff.tv_sec * 1000 + diff.tv_usec / 1000.0);
if (mp_msg_test(MSGT_TV, MSGL_V)) {
mp_msg(MSGT_TV, MSGL_ERR, "ALSA Status:\n");
snd_pcm_status_dump(status, ai->alsa.log);
}
if ((res = snd_pcm_prepare(ai->alsa.handle))<0) {
mp_msg(MSGT_TV, MSGL_ERR, MSGTR_MPDEMUX_AIALSA_AlsaXRUNPrepareError, snd_strerror(res));
return -1;
}
return 0; /* ok, data should be accepted again */
}
mp_msg(MSGT_TV, MSGL_ERR, MSGTR_MPDEMUX_AIALSA_AlsaReadWriteError);
return -1;
}
static int log_state(ALSA_CARD *card) {
// log card state
snd_pcm_status_t *status;
snd_pcm_state_t state;
const char *state_str;
snd_pcm_status_alloca(&status);
snd_pcm_status(card->handle, status);
state = snd_pcm_status_get_state(status);
switch (state) {
case SND_PCM_STATE_RUNNING:
state_str = "running";
break;
case SND_PCM_STATE_XRUN:
state_str = "overrun";
break;
case SND_PCM_STATE_DRAINING:
state_str = "draining";
break;
case SND_PCM_STATE_PAUSED:
state_str = "paused";
break;
case SND_PCM_STATE_SUSPENDED:
state_str = "suspended";
break;
case SND_PCM_STATE_DISCONNECTED:
state_str = "disconnected";
break;
default:
state_str = "other";
}
log_msg("ALSA: state: %s [%d]\n", state_str, (int)state);
return state;
}
static GstClockTime
gst_alsasrc_get_timestamp (GstAlsaSrc * asrc)
{
snd_pcm_status_t *status;
snd_htimestamp_t tstamp;
GstClockTime timestamp;
snd_pcm_uframes_t avail;
gint err = -EPIPE;
if (G_UNLIKELY (!asrc)) {
GST_ERROR_OBJECT (asrc, "No alsa handle created yet !");
return GST_CLOCK_TIME_NONE;
}
if (G_UNLIKELY (snd_pcm_status_malloc (&status) != 0)) {
GST_ERROR_OBJECT (asrc, "snd_pcm_status_malloc failed");
return GST_CLOCK_TIME_NONE;
}
if (G_UNLIKELY (snd_pcm_status (asrc->handle, status) != 0)) {
GST_ERROR_OBJECT (asrc, "snd_pcm_status failed");
return GST_CLOCK_TIME_NONE;
}
/* in case an xrun condition has occured we need to handle this */
if (snd_pcm_status_get_state (status) != SND_PCM_STATE_RUNNING) {
if (xrun_recovery (asrc, asrc->handle, err) < 0) {
GST_WARNING_OBJECT (asrc, "Could not recover from xrun condition !");
}
/* reload the status alsa status object, since recovery made it invalid */
if (G_UNLIKELY (snd_pcm_status (asrc->handle, status) != 0)) {
GST_ERROR_OBJECT (asrc, "snd_pcm_status failed");
}
}
/* get high resolution time stamp from driver */
snd_pcm_status_get_htstamp (status, &tstamp);
timestamp = GST_TIMESPEC_TO_TIME (tstamp);
/* max available frames sets the depth of the buffer */
avail = snd_pcm_status_get_avail (status);
/* calculate the timestamp of the next sample to be read */
timestamp -= gst_util_uint64_scale_int (avail, GST_SECOND, asrc->rate);
/* compensate for the fact that we really need the timestamp of the
* previously read data segment */
timestamp -= asrc->period_time * 1000;
snd_pcm_status_free (status);
GST_LOG_OBJECT (asrc, "ALSA timestamp : %" GST_TIME_FORMAT
", delay %lu", GST_TIME_ARGS (timestamp), avail);
return timestamp;
}
static void xrun(void)
{
snd_pcm_status_t *status;
int res;
snd_pcm_status_alloca(&status);
if ((res = snd_pcm_status(AHandle, status))<0) {
fprintf(stderr, "status error: %s", snd_strerror(res));
return;
}
if (snd_pcm_status_get_state(status) == SND_PCM_STATE_XRUN) {
if (monotonic) {
#ifdef HAVE_CLOCK_GETTIME
struct timespec now, diff, tstamp;
clock_gettime(CLOCK_MONOTONIC, &now);
snd_pcm_status_get_trigger_htstamp(status, &tstamp);
timermsub(&now, &tstamp, &diff);
fprintf(stderr, _("%s!!! (at least %.3f ms long)\n"),
stream == SND_PCM_STREAM_PLAYBACK ? _("underrun") : _("overrun"),
diff.tv_sec * 1000 + diff.tv_nsec / 10000000.0);
#else
fprintf(stderr, "%s !!!\n", "underrun");
#endif
} else {
struct timeval now, diff, tstamp;
gettimeofday(&now, 0);
snd_pcm_status_get_trigger_tstamp(status, &tstamp);
timersub(&now, &tstamp, &diff);
fprintf(stderr, "%s!!! (at least %.3f ms long)\n",
"Underrun",
diff.tv_sec * 1000 + diff.tv_usec / 1000.0);
}
if ((res = snd_pcm_prepare(AHandle))<0) {
fprintf(stderr, "xrun: prepare error: %s", snd_strerror(res)); /* we should probably die here */
return;
}
return; /* ok, data should be accepted again */
}
fprintf(stderr, "read/write error, state = %s", snd_pcm_state_name(snd_pcm_status_get_state(status)));
}
static void alsa_resume(snd_pcm_t *handle){
int err;
snd_pcm_status_t *status=NULL;
snd_pcm_status_alloca(&status);
if ((err=snd_pcm_status(handle,status))!=0){
ms_warning("snd_pcm_status() failed: %s",snd_strerror(err));
return;
}
if (snd_pcm_status_get_state(status)==SND_PCM_STATE_SUSPENDED){
ms_warning("Maybe suspended, trying resume");
if ((err=snd_pcm_resume(handle))!=0){
if (err!=EWOULDBLOCK) ms_warning("snd_pcm_resume() failed: %s",snd_strerror(err));
}
}
}
int
AlsaLayer::read(SFLAudioSample* buffer, int frames)
{
if (snd_pcm_state(captureHandle_) == SND_PCM_STATE_XRUN) {
prepareCaptureStream();
startCaptureStream();
}
int err = snd_pcm_readi(captureHandle_, (void*)buffer, frames);
if (err >= 0)
return err;
switch (err) {
case -EPIPE:
case -ESTRPIPE:
case -EIO: {
snd_pcm_status_t* status;
snd_pcm_status_alloca(&status);
if (ALSA_CALL(snd_pcm_status(captureHandle_, status), "Get status failed") >= 0)
if (snd_pcm_status_get_state(status) == SND_PCM_STATE_XRUN) {
stopCaptureStream();
prepareCaptureStream();
startCaptureStream();
}
ERROR("XRUN capture ignored (%s)", snd_strerror(err));
break;
}
case -EPERM:
ERROR("Can't capture, EPERM (%s)", snd_strerror(err));
prepareCaptureStream();
startCaptureStream();
break;
}
return 0;
}
/*a@nufront start*/
void AudioStreamInALSA::xrun(snd_pcm_t * handle)
{
snd_pcm_status_t *status;
int res;
ZJFLOGD("function in.");
snd_pcm_status_alloca(&status);
if ((res = snd_pcm_status(handle, status))<0) {
ZJFLOGE("status error: %s", snd_strerror(res));
return;
}
if (snd_pcm_status_get_state(status) == SND_PCM_STATE_XRUN) {
struct timeval now, diff, tstamp;
gettimeofday(&now, 0);
snd_pcm_status_get_trigger_tstamp(status, &tstamp);
timersub(&now, &tstamp, &diff);
ZJFLOGE("overrun!!! (at least %.3f ms long)",
diff.tv_sec * 1000 + diff.tv_usec / 1000.0);
}
ZJFLOGD("function out.");
return;
}
int main(int argc, char *argv[]) {
const char *dev;
int r, cap, count = 0;
snd_pcm_hw_params_t *hwparams;
snd_pcm_sw_params_t *swparams;
snd_pcm_status_t *status;
snd_pcm_t *pcm;
unsigned rate = 44100;
unsigned periods = 2;
snd_pcm_uframes_t boundary, buffer_size = 44100/10; /* 100s */
int dir = 1;
struct timespec start, last_timestamp = { 0, 0 };
uint64_t start_us, last_us = 0;
snd_pcm_sframes_t last_avail = 0, last_delay = 0;
struct pollfd *pollfds;
int n_pollfd;
int64_t sample_count = 0;
struct sched_param sp;
r = -1;
#ifdef _POSIX_PRIORITY_SCHEDULING
sp.sched_priority = 5;
r = pthread_setschedparam(pthread_self(), SCHED_RR, &sp);
#endif
if (r)
printf("Could not get RT prio. :(\n");
snd_pcm_hw_params_alloca(&hwparams);
snd_pcm_sw_params_alloca(&swparams);
snd_pcm_status_alloca(&status);
r = clock_gettime(CLOCK_MONOTONIC, &start);
assert(r == 0);
start_us = timespec_us(&start);
dev = argc > 1 ? argv[1] : "front:AudioPCI";
cap = argc > 2 ? atoi(argv[2]) : 0;
if (cap == 0)
r = snd_pcm_open(&pcm, dev, SND_PCM_STREAM_PLAYBACK, 0);
else
r = snd_pcm_open(&pcm, dev, SND_PCM_STREAM_CAPTURE, 0);
assert(r == 0);
r = snd_pcm_hw_params_any(pcm, hwparams);
assert(r == 0);
r = snd_pcm_hw_params_set_rate_resample(pcm, hwparams, 0);
assert(r == 0);
r = snd_pcm_hw_params_set_access(pcm, hwparams, SND_PCM_ACCESS_RW_INTERLEAVED);
assert(r == 0);
r = snd_pcm_hw_params_set_format(pcm, hwparams, SND_PCM_FORMAT_S16_LE);
assert(r == 0);
r = snd_pcm_hw_params_set_rate_near(pcm, hwparams, &rate, NULL);
assert(r == 0);
r = snd_pcm_hw_params_set_channels(pcm, hwparams, 2);
assert(r == 0);
r = snd_pcm_hw_params_set_periods_integer(pcm, hwparams);
assert(r == 0);
r = snd_pcm_hw_params_set_periods_near(pcm, hwparams, &periods, &dir);
assert(r == 0);
r = snd_pcm_hw_params_set_buffer_size_near(pcm, hwparams, &buffer_size);
assert(r == 0);
r = snd_pcm_hw_params(pcm, hwparams);
assert(r == 0);
r = snd_pcm_hw_params_current(pcm, hwparams);
assert(r == 0);
r = snd_pcm_sw_params_current(pcm, swparams);
assert(r == 0);
if (cap == 0)
r = snd_pcm_sw_params_set_avail_min(pcm, swparams, 1);
else
r = snd_pcm_sw_params_set_avail_min(pcm, swparams, 0);
assert(r == 0);
r = snd_pcm_sw_params_set_period_event(pcm, swparams, 0);
assert(r == 0);
r = snd_pcm_hw_params_get_buffer_size(hwparams, &buffer_size);
assert(r == 0);
r = snd_pcm_sw_params_set_start_threshold(pcm, swparams, buffer_size);
assert(r == 0);
r = snd_pcm_sw_params_get_boundary(swparams, &boundary);
assert(r == 0);
r = snd_pcm_sw_params_set_stop_threshold(pcm, swparams, boundary);
assert(r == 0);
r = snd_pcm_sw_params_set_tstamp_mode(pcm, swparams, SND_PCM_TSTAMP_ENABLE);
assert(r == 0);
r = snd_pcm_sw_params(pcm, swparams);
assert(r == 0);
r = snd_pcm_prepare(pcm);
assert(r == 0);
r = snd_pcm_sw_params_current(pcm, swparams);
assert(r == 0);
/* assert(snd_pcm_hw_params_is_monotonic(hwparams) > 0); */
n_pollfd = snd_pcm_poll_descriptors_count(pcm);
assert(n_pollfd > 0);
pollfds = malloc(sizeof(struct pollfd) * n_pollfd);
assert(pollfds);
r = snd_pcm_poll_descriptors(pcm, pollfds, n_pollfd);
assert(r == n_pollfd);
printf("Starting. Buffer size is %u frames\n", (unsigned int) buffer_size);
if (cap) {
r = snd_pcm_start(pcm);
assert(r == 0);
}
for (;;) {
snd_pcm_sframes_t avail, delay;
struct timespec now, timestamp;
unsigned short revents;
int handled = 0;
uint64_t now_us, timestamp_us;
snd_pcm_state_t state;
unsigned long long pos;
r = poll(pollfds, n_pollfd, 0);
assert(r >= 0);
r = snd_pcm_poll_descriptors_revents(pcm, pollfds, n_pollfd, &revents);
assert(r == 0);
if (cap == 0)
assert((revents & ~POLLOUT) == 0);
else
assert((revents & ~POLLIN) == 0);
avail = snd_pcm_avail(pcm);
assert(avail >= 0);
r = snd_pcm_status(pcm, status);
assert(r == 0);
/* This assertion fails from time to time. ALSA seems to be broken */
/* assert(avail == (snd_pcm_sframes_t) snd_pcm_status_get_avail(status)); */
/* printf("%lu %lu\n", (unsigned long) avail, (unsigned long) snd_pcm_status_get_avail(status)); */
snd_pcm_status_get_htstamp(status, ×tamp);
delay = snd_pcm_status_get_delay(status);
state = snd_pcm_status_get_state(status);
r = clock_gettime(CLOCK_MONOTONIC, &now);
assert(r == 0);
assert(!revents || avail > 0);
if ((!cap && avail) || (cap && (unsigned)avail >= buffer_size)) {
snd_pcm_sframes_t sframes;
static const uint16_t psamples[2] = { 0, 0 };
uint16_t csamples[2];
if (cap == 0)
sframes = snd_pcm_writei(pcm, psamples, 1);
else
sframes = snd_pcm_readi(pcm, csamples, 1);
assert(sframes == 1);
handled = 1;
sample_count++;
}
if (!handled &&
memcmp(×tamp, &last_timestamp, sizeof(timestamp)) == 0 &&
avail == last_avail &&
delay == last_delay) {
/* This is boring */
continue;
}
now_us = timespec_us(&now);
timestamp_us = timespec_us(×tamp);
if (cap == 0)
pos = (unsigned long long) ((sample_count - handled - delay) * 1000000LU / 44100);
else
pos = (unsigned long long) ((sample_count - handled + delay) * 1000000LU / 44100);
if (count++ % 50 == 0)
printf("Elapsed\tCPU\tALSA\tPos\tSamples\tavail\tdelay\trevents\thandled\tstate\n");
printf("%llu\t%llu\t%llu\t%llu\t%llu\t%li\t%li\t%i\t%i\t%i\n",
(unsigned long long) (now_us - last_us),
(unsigned long long) (now_us - start_us),
(unsigned long long) (timestamp_us ? timestamp_us - start_us : 0),
pos,
(unsigned long long) sample_count,
(signed long) avail,
(signed long) delay,
revents,
handled,
state);
if (cap == 0)
/** When this assert is hit, most likely something bad
* happened, i.e. the avail jumped suddenly. */
assert((unsigned) avail <= buffer_size);
last_avail = avail;
last_delay = delay;
last_timestamp = timestamp;
last_us = now_us;
}
return 0;
}
static int
alsa_write_float (snd_pcm_t *alsa_dev, float *data, int frames, int channels)
{ static int epipe_count = 0 ;
int total = 0 ;
int retval ;
if (epipe_count > 0)
epipe_count -- ;
while (total < frames)
{ retval = snd_pcm_writei (alsa_dev, data + total * channels, frames - total) ;
if (retval >= 0)
{ total += retval ;
if (total == frames)
return total ;
continue ;
} ;
switch (retval)
{ case -EAGAIN :
puts ("alsa_write_float: EAGAIN") ;
continue ;
break ;
case -EPIPE :
if (epipe_count > 0)
{ printf ("alsa_write_float: EPIPE %d\n", epipe_count) ;
if (epipe_count > 140)
return retval ;
} ;
epipe_count += 100 ;
#if 0
if (0)
{ snd_pcm_status_t *status ;
snd_pcm_status_alloca (&status) ;
if ((retval = snd_pcm_status (alsa_dev, status)) < 0)
fprintf (stderr, "alsa_out: xrun. can't determine length\n") ;
else if (snd_pcm_status_get_state (status) == SND_PCM_STATE_XRUN)
{ struct timeval now, diff, tstamp ;
gettimeofday (&now, 0) ;
snd_pcm_status_get_trigger_tstamp (status, &tstamp) ;
timersub (&now, &tstamp, &diff) ;
fprintf (stderr, "alsa_write_float xrun: of at least %.3f msecs. resetting stream\n",
diff.tv_sec * 1000 + diff.tv_usec / 1000.0) ;
}
else
fprintf (stderr, "alsa_write_float: xrun. can't determine length\n") ;
} ;
#endif
snd_pcm_prepare (alsa_dev) ;
break ;
case -EBADFD :
fprintf (stderr, "alsa_write_float: Bad PCM state.n") ;
return 0 ;
break ;
case -ESTRPIPE :
fprintf (stderr, "alsa_write_float: Suspend event.n") ;
return 0 ;
break ;
case -EIO :
puts ("alsa_write_float: EIO") ;
return 0 ;
default :
fprintf (stderr, "alsa_write_float: retval = %d\n", retval) ;
return 0 ;
break ;
} ; /* switch */
} ; /* while */
return total ;
} /* alsa_write_float */
/*----------------------------------------------------------------------
| AlsaOutput_Write
+---------------------------------------------------------------------*/
static BLT_Result
AlsaOutput_Write(AlsaOutput* self, void* buffer, BLT_Size size)
{
int watchdog = 5;
int io_result;
unsigned int sample_count;
unsigned int sample_size;
BLT_Result result;
/* ensure that the device is prepared */
result = AlsaOutput_Prepare(self);
if (BLT_FAILED(result)) return result;
/* compute the number of samples */
sample_size = self->media_type.channel_count*self->media_type.bits_per_sample/8;
sample_count = size / sample_size;
/* write samples to the device and handle underruns */
do {
while (sample_count) {
io_result = snd_pcm_writei(self->device_handle,
buffer, sample_count);
if (io_result > 0) {
buffer = (void*)((char*)buffer + io_result*sample_size);
if ((unsigned int)io_result <= sample_count) {
sample_count -= io_result;
} else {
/* strange, snd_pcm_writei returned more than we wrote */
sample_count = 0;
}
} else {
break;
}
}
if (sample_count == 0) return BLT_SUCCESS;
/* we reach this point if the first write failed */
if (io_result < 0) {
snd_pcm_status_t* status;
snd_pcm_state_t state;
snd_pcm_status_alloca_no_assert(&status);
io_result = snd_pcm_status(self->device_handle, status);
if (io_result != 0) {
return BLT_FAILURE;
}
state = snd_pcm_status_get_state(status);
if (state == SND_PCM_STATE_XRUN) {
ATX_LOG_FINE("**** UNDERRUN *****");
/* re-prepare the channel */
io_result = snd_pcm_prepare(self->device_handle);
if (io_result != 0) {
return BLT_FAILURE;
}
} else {
ATX_LOG_WARNING_1("**** STATE = %d ****", state);
}
} else {
ATX_LOG_WARNING_1("snd_pcm_writei() returned %d", io_result);
}
ATX_LOG_FINE("**** RETRY *****");
} while(watchdog--);
ATX_LOG_SEVERE("**** THE WATCHDOG BIT US ****");
return BLT_FAILURE;
}
/*****************************************************************************
* ALSAFill: function used to fill the ALSA buffer as much as possible
*****************************************************************************/
static void ALSAFill( aout_instance_t * p_aout )
{
struct aout_sys_t * p_sys = p_aout->output.p_sys;
snd_pcm_t *p_pcm = p_sys->p_snd_pcm;
snd_pcm_status_t * p_status;
int i_snd_rc;
mtime_t next_date;
int canc = vlc_savecancel();
/* Fill in the buffer until space or audio output buffer shortage */
/* Get the status */
snd_pcm_status_alloca(&p_status);
i_snd_rc = snd_pcm_status( p_pcm, p_status );
if( i_snd_rc < 0 )
{
msg_Err( p_aout, "cannot get device status" );
goto error;
}
/* Handle buffer underruns and get the status again */
if( snd_pcm_status_get_state( p_status ) == SND_PCM_STATE_XRUN )
{
/* Prepare the device */
i_snd_rc = snd_pcm_prepare( p_pcm );
if( i_snd_rc )
{
msg_Err( p_aout, "cannot recover from buffer underrun" );
goto error;
}
msg_Dbg( p_aout, "recovered from buffer underrun" );
/* Get the new status */
i_snd_rc = snd_pcm_status( p_pcm, p_status );
if( i_snd_rc < 0 )
{
msg_Err( p_aout, "cannot get device status after recovery" );
goto error;
}
/* Underrun, try to recover as quickly as possible */
next_date = mdate();
}
else
{
/* Here the device should be in RUNNING state, p_status is valid. */
snd_pcm_sframes_t delay = snd_pcm_status_get_delay( p_status );
if( delay == 0 ) /* workaround buggy alsa drivers */
if( snd_pcm_delay( p_pcm, &delay ) < 0 )
delay = 0; /* FIXME: use a positive minimal delay */
size_t i_bytes = snd_pcm_frames_to_bytes( p_pcm, delay );
mtime_t delay_us = CLOCK_FREQ * i_bytes
/ p_aout->output.output.i_bytes_per_frame
/ p_aout->output.output.i_rate
* p_aout->output.output.i_frame_length;
#ifdef ALSA_DEBUG
snd_pcm_state_t state = snd_pcm_status_get_state( p_status );
if( state != SND_PCM_STATE_RUNNING )
msg_Err( p_aout, "pcm status (%d) != RUNNING", state );
msg_Dbg( p_aout, "Delay is %ld frames (%zu bytes)", delay, i_bytes );
msg_Dbg( p_aout, "Bytes per frame: %d", p_aout->output.output.i_bytes_per_frame );
msg_Dbg( p_aout, "Rate: %d", p_aout->output.output.i_rate );
msg_Dbg( p_aout, "Frame length: %d", p_aout->output.output.i_frame_length );
msg_Dbg( p_aout, "Next date: in %"PRId64" microseconds", delay_us );
#endif
next_date = mdate() + delay_us;
}
block_t *p_buffer = aout_OutputNextBuffer( p_aout, next_date,
(p_aout->output.output.i_format == VLC_CODEC_SPDIFL) );
/* Audio output buffer shortage -> stop the fill process and wait */
if( p_buffer == NULL )
goto error;
for (;;)
{
int n = snd_pcm_poll_descriptors_count(p_pcm);
struct pollfd ufd[n];
unsigned short revents;
snd_pcm_poll_descriptors(p_pcm, ufd, n);
do
{
vlc_restorecancel(canc);
poll(ufd, n, -1);
canc = vlc_savecancel();
snd_pcm_poll_descriptors_revents(p_pcm, ufd, n, &revents);
}
while(!revents);
if(revents & POLLOUT)
{
i_snd_rc = snd_pcm_writei( p_pcm, p_buffer->p_buffer,
p_buffer->i_nb_samples );
if( i_snd_rc != -ESTRPIPE )
break;
}
/* a suspend event occurred
* (stream is suspended and waiting for an application recovery) */
msg_Dbg( p_aout, "entering in suspend mode, trying to resume..." );
while( ( i_snd_rc = snd_pcm_resume( p_pcm ) ) == -EAGAIN )
{
vlc_restorecancel(canc);
msleep(CLOCK_FREQ); /* device still suspended, wait... */
canc = vlc_savecancel();
}
if( i_snd_rc < 0 )
/* Device does not support resuming, restart it */
i_snd_rc = snd_pcm_prepare( p_pcm );
}
if( i_snd_rc < 0 )
msg_Err( p_aout, "cannot write: %s", snd_strerror( i_snd_rc ) );
vlc_restorecancel(canc);
block_Release( p_buffer );
return;
error:
if( i_snd_rc < 0 )
msg_Err( p_aout, "ALSA error: %s", snd_strerror( i_snd_rc ) );
vlc_restorecancel(canc);
msleep(p_sys->i_period_time / 2);
}
/*****************************************************************************
* ALSAFill: function used to fill the ALSA buffer as much as possible
*****************************************************************************/
static void ALSAFill( aout_instance_t * p_aout )
{
struct aout_sys_t * p_sys = p_aout->output.p_sys;
aout_buffer_t * p_buffer;
snd_pcm_status_t * p_status = p_sys->p_status;
int i_snd_rc;
mtime_t next_date;
/* Fill in the buffer until space or audio output buffer shortage */
/* Get the status */
i_snd_rc = snd_pcm_status( p_sys->p_snd_pcm, p_status );
if( i_snd_rc < 0 )
{
msg_Err( p_aout, "cannot get device status" );
goto error;
}
/* Handle buffer underruns and get the status again */
if( snd_pcm_status_get_state( p_status ) == SND_PCM_STATE_XRUN )
{
/* Prepare the device */
i_snd_rc = snd_pcm_prepare( p_sys->p_snd_pcm );
if( i_snd_rc )
{
msg_Err( p_aout, "cannot recover from buffer underrun" );
goto error;
}
msg_Dbg( p_aout, "recovered from buffer underrun" );
/* Get the new status */
i_snd_rc = snd_pcm_status( p_sys->p_snd_pcm, p_status );
if( i_snd_rc < 0 )
{
msg_Err( p_aout, "cannot get device status after recovery" );
goto error;
}
/* Underrun, try to recover as quickly as possible */
next_date = mdate();
}
else
{
/* Here the device should be in RUNNING state, p_status is valid. */
snd_pcm_sframes_t delay = snd_pcm_status_get_delay( p_status );
if( delay == 0 ) /* workaround buggy alsa drivers */
if( snd_pcm_delay( p_sys->p_snd_pcm, &delay ) < 0 )
delay = 0; /* FIXME: use a positive minimal delay */
int i_bytes = snd_pcm_frames_to_bytes( p_sys->p_snd_pcm, delay );
next_date = mdate() + ( (mtime_t)i_bytes * 1000000
/ p_aout->output.output.i_bytes_per_frame
/ p_aout->output.output.i_rate
* p_aout->output.output.i_frame_length );
#ifdef ALSA_DEBUG
snd_pcm_state_t state = snd_pcm_status_get_state( p_status );
if( state != SND_PCM_STATE_RUNNING )
msg_Err( p_aout, "pcm status (%d) != RUNNING", state );
msg_Dbg( p_aout, "Delay is %ld frames (%d bytes)", delay, i_bytes );
msg_Dbg( p_aout, "Bytes per frame: %d", p_aout->output.output.i_bytes_per_frame );
msg_Dbg( p_aout, "Rate: %d", p_aout->output.output.i_rate );
msg_Dbg( p_aout, "Frame length: %d", p_aout->output.output.i_frame_length );
msg_Dbg( p_aout, "Next date is in %d microseconds", (int)(next_date - mdate()) );
#endif
}
p_buffer = aout_OutputNextBuffer( p_aout, next_date,
(p_aout->output.output.i_format == VLC_CODEC_SPDIFL) );
/* Audio output buffer shortage -> stop the fill process and wait */
if( p_buffer == NULL )
goto error;
for (;;)
{
i_snd_rc = snd_pcm_writei( p_sys->p_snd_pcm, p_buffer->p_buffer,
p_buffer->i_nb_samples );
if( i_snd_rc != -ESTRPIPE )
break;
/* a suspend event occurred
* (stream is suspended and waiting for an application recovery) */
msg_Dbg( p_aout, "entering in suspend mode, trying to resume..." );
while( vlc_object_alive (p_aout) && vlc_object_alive (p_aout->p_libvlc) &&
( i_snd_rc = snd_pcm_resume( p_sys->p_snd_pcm ) ) == -EAGAIN )
{
msleep( 1000000 );
}
if( i_snd_rc < 0 )
/* Device does not supprot resuming, restart it */
i_snd_rc = snd_pcm_prepare( p_sys->p_snd_pcm );
}
if( i_snd_rc < 0 )
msg_Err( p_aout, "cannot write: %s", snd_strerror( i_snd_rc ) );
aout_BufferFree( p_buffer );
return;
error:
if( i_snd_rc < 0 )
msg_Err( p_aout, "ALSA error: %s", snd_strerror( i_snd_rc ) );
msleep( p_sys->i_period_time >> 1 );
}
