/*----------------------------------------------------------------------
| AlsaOutput_GetStatus
+---------------------------------------------------------------------*/
BLT_METHOD
AlsaOutput_GetStatus(BLT_OutputNode* _self,
BLT_OutputNodeStatus* status)
{
AlsaOutput* self = ATX_SELF(AlsaOutput, BLT_OutputNode);
snd_pcm_status_t* pcm_status;
snd_pcm_sframes_t delay = 0;
int io_result;
/* default values */
status->media_time.seconds = 0;
status->media_time.nanoseconds = 0;
status->flags = 0;
/* get the driver status */
snd_pcm_status_alloca_no_assert(&pcm_status);
io_result = snd_pcm_status(self->device_handle, pcm_status);
if (io_result != 0) {
return BLT_FAILURE;
}
delay = snd_pcm_status_get_delay(pcm_status);
if (delay == 0) {
/* workaround buggy alsa drivers */
io_result = snd_pcm_delay(self->device_handle, &delay);
if (io_result != 0) {
return BLT_FAILURE;
}
}
if (delay > 0 && self->media_type.sample_rate) {
ATX_UInt64 media_time_samples = (self->next_media_time *
(ATX_UInt64)self->media_type.sample_rate)/
(ATX_UInt64)1000000000;
ATX_UInt64 media_time_ns;
if (delay <= (snd_pcm_sframes_t)media_time_samples) {
media_time_samples -= delay;
} else {
media_time_samples = 0;
}
media_time_ns = (media_time_samples*(ATX_UInt64)1000000000)/self->media_type.sample_rate;
status->media_time = BLT_TimeStamp_FromNanos(media_time_ns);
} else {
status->media_time = BLT_TimeStamp_FromNanos(self->next_media_time);
}
/* return the computed media time */
ATX_LOG_FINEST_3("delay = %lld samples, input port time = %lld, media time = %lld", (ATX_UInt64)delay, self->next_media_time, BLT_TimeStamp_ToNanos(status->media_time));
return BLT_SUCCESS;
}
/*----------------------------------------------------------------------
| OsxAudioUnitsOutput_GetStatus
+---------------------------------------------------------------------*/
BLT_METHOD
OsxAudioUnitsOutput_GetStatus(BLT_OutputNode* _self,
BLT_OutputNodeStatus* status)
{
OsxAudioUnitsOutput* self = ATX_SELF(OsxAudioUnitsOutput, BLT_OutputNode);
/* default values */
status->flags = 0;
pthread_mutex_lock(&self->lock);
/* check if the queue is full */
if (ATX_List_GetItemCount(self->packet_queue) >= self->max_packets_in_queue) {
ATX_LOG_FINER("packet queue is full");
status->flags |= BLT_OUTPUT_NODE_STATUS_QUEUE_FULL;
}
/* compute the media time */
BLT_TimeStamp_Set(status->media_time, 0, 0);
if (self->media_time_snapshot.rendered_host_time) {
UInt64 host_time = AudioConvertHostTimeToNanos(AudioGetCurrentHostTime());
UInt64 media_time = BLT_TimeStamp_ToNanos(self->media_time_snapshot.rendered_packet_ts);
ATX_LOG_FINER_3("host time = %lld, last rendered packet = %lld, rendered ts = %lld",
host_time,
self->media_time_snapshot.rendered_host_time,
media_time);
if (host_time > self->media_time_snapshot.rendered_host_time) {
media_time += host_time-self->media_time_snapshot.rendered_host_time;
}
UInt64 max_media_time;
max_media_time = BLT_TimeStamp_ToNanos(self->media_time_snapshot.rendered_packet_ts) +
BLT_TimeStamp_ToNanos(self->media_time_snapshot.rendered_duration);
ATX_LOG_FINER_2("computed media time = %lld, max media time = %lld",
media_time, max_media_time);
if (media_time > max_media_time) {
ATX_LOG_FINER("media time clamped to max");
media_time = max_media_time;
}
status->media_time = BLT_TimeStamp_FromNanos(media_time);
ATX_LOG_FINER_1("media time = %lld", media_time);
}
pthread_mutex_unlock(&self->lock);
return BLT_SUCCESS;
}
/*----------------------------------------------------------------------
| BLT_TimeStamp_FromSeconds
+---------------------------------------------------------------------*/
BLT_TimeStamp
BLT_TimeStamp_FromSeconds(double seconds)
{
return BLT_TimeStamp_FromNanos((ATX_UInt64)(1000000000.0*seconds));
}
