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gst: handle latency in the pipewiresrc

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Get the delay in the graph and subtract this from the cycle start time
to get the timestamp of the buffer.

Report this latency as well.

Fixes #30
This commit is contained in:
Wim Taymans 2024-03-15 17:31:43 +01:00
parent 1fe498560b
commit 2c0d73ab49
2 changed files with 17 additions and 10 deletions
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26
src/gst/gstpipewiresrc.c
View file

@ -441,6 +441,8 @@ gst_pipewire_src_init (GstPipeWireSrc * src)
src->resend_last = DEFAULT_RESEND_LAST;
src->keepalive_time = DEFAULT_KEEPALIVE_TIME;
src->autoconnect = DEFAULT_AUTOCONNECT;
src->min_latency = 0;
src->max_latency = GST_CLOCK_TIME_NONE;
src->client_name = g_strdup(pw_get_client_name ());
@ -549,6 +551,7 @@ static GstBuffer *dequeue_buffer(GstPipeWireSrc *pwsrc)
struct spa_meta_header *h;
struct spa_meta_region *crop;
struct spa_meta_videotransform *videotransform;
struct pw_time time;
guint i;
b = pw_stream_dequeue_buffer (pwsrc->stream);
@ -567,6 +570,17 @@ static GstBuffer *dequeue_buffer(GstPipeWireSrc *pwsrc)
return NULL;
}
pw_stream_get_time_n(pwsrc->stream, &time, sizeof(time));
if (pwsrc->delay != time.delay && time.rate.denom != 0) {
pwsrc->min_latency = time.delay * GST_SECOND * time.rate.num / time.rate.denom;
GST_LOG_OBJECT (pwsrc, "latency changed %"PRIi64" -> %"PRIi64" %"PRIu64,
pwsrc->delay, time.delay, pwsrc->min_latency);
pwsrc->delay = time.delay;
gst_element_post_message (GST_ELEMENT_CAST (pwsrc),
gst_message_new_latency (GST_OBJECT_CAST (pwsrc)));
}
GST_LOG_OBJECT (pwsrc, "got new buffer %p", data->buf);
buf = gst_buffer_new ();
@ -586,8 +600,8 @@ static GstBuffer *dequeue_buffer(GstPipeWireSrc *pwsrc)
}
GST_BUFFER_OFFSET (buf) = h->seq;
} else {
GST_BUFFER_PTS (buf) = b->time;
GST_BUFFER_DTS (buf) = b->time;
GST_BUFFER_PTS (buf) = b->time - pwsrc->delay;
GST_BUFFER_DTS (buf) = b->time - pwsrc->delay;
}
crop = data->crop;
if (crop) {
@ -704,12 +718,6 @@ parse_stream_properties (GstPipeWireSrc *pwsrc, const struct pw_properties *prop
GST_OBJECT_LOCK (pwsrc);
var = pw_properties_get (props, PW_KEY_STREAM_IS_LIVE);
is_live = pwsrc->is_live = var ? pw_properties_parse_bool(var) : TRUE;
var = pw_properties_get (props, PW_KEY_STREAM_LATENCY_MIN);
pwsrc->min_latency = var ? (GstClockTime) atoi (var) : 0;
var = pw_properties_get (props, PW_KEY_STREAM_LATENCY_MAX);
pwsrc->max_latency = var ? (GstClockTime) atoi (var) : GST_CLOCK_TIME_NONE;
GST_OBJECT_UNLOCK (pwsrc);
GST_DEBUG_OBJECT (pwsrc, "live %d", is_live);
@ -1171,8 +1179,6 @@ gst_pipewire_src_query (GstBaseSrc * src, GstQuery * query)
switch (GST_QUERY_TYPE (query)) {
case GST_QUERY_LATENCY:
GST_OBJECT_LOCK (pwsrc);
pwsrc->min_latency = 10000000;
pwsrc->max_latency = GST_CLOCK_TIME_NONE;
gst_query_set_latency (query, pwsrc->is_live, pwsrc->min_latency, pwsrc->max_latency);
GST_OBJECT_UNLOCK (pwsrc);
res = TRUE;