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niimaqsrc: add UNIX epoch reference timestamp for absolute timestamping

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Requires GStreamer 1.14 and a downstream element that can use it.
This commit is contained in:
Joshua M. Doe 2019-10-02 09:17:05 -04:00
parent 54f9df72b7
commit 11bb336ee4
2 changed files with 36 additions and 2 deletions
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34
sys/niimaq/gstniimaq.c
View File

@ -32,8 +32,6 @@
* </refsect2>
*/
/* FIXME: timestamps sent in GST_TAG_DATE_TIME are off, need to adjust for time of first buffer */
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
@ -104,6 +102,10 @@ static gboolean gst_niimaqsrc_close_interface (GstNiImaqSrc * src);
} \
}
#if GST_CHECK_VERSION(1,14,0)
static GstStaticCaps unix_reference = GST_STATIC_CAPS ("timestamp/x-unix");
#endif
uInt32
gst_niimaqsrc_aq_in_progress_callback (SESSION_ID sid, IMG_ERR err,
IMG_SIGNAL_TYPE signal_type, uInt32 signal_identifier, void *userdata)
@ -322,6 +324,8 @@ gst_niimaqsrc_init (GstNiImaqSrc * src)
src->interface_name = g_strdup (DEFAULT_PROP_DEVICE);
src->is_signed = DEFAULT_PROP_IS_SIGNED;
src->timeout = DEFAULT_PROP_TIMEOUT;
src->clock = NULL;
}
/**
@ -459,6 +463,10 @@ gst_niimaqsrc_reset (GstNiImaqSrc * src)
g_async_queue_unref (src->time_queue);
}
src->time_queue = g_async_queue_new ();
if (src->clock) {
gst_object_unref (src->clock);
}
}
static gboolean
@ -510,6 +518,11 @@ gst_niimaqsrc_create (GstPushSrc * psrc, GstBuffer ** buffer)
("Unable to start acquisition."), (NULL));
return GST_FLOW_ERROR;
}
src->clock = gst_element_get_clock (GST_ELEMENT (src));
/* assume delay between these two calls is negligible */
src->unix_base = g_get_real_time () * 1000;
src->stream_base = gst_clock_get_time (src->clock);
}
GST_LOG_OBJECT (src, "Allocating memory for IMAQ buffer #%d, size %d",
@ -586,6 +599,23 @@ gst_niimaqsrc_create (GstPushSrc * psrc, GstBuffer ** buffer)
GST_BUFFER_OFFSET_END (*buffer) = copied_number + 1;
GST_BUFFER_TIMESTAMP (*buffer) =
timestamp - gst_element_get_base_time (GST_ELEMENT (src));
#if GST_CHECK_VERSION(1,14,0)
{
GstClockTime unix_ts = src->unix_base + (timestamp - src->stream_base);
gst_buffer_add_reference_timestamp_meta (*buffer,
gst_static_caps_get (&unix_reference), unix_ts, GST_CLOCK_TIME_NONE);
GST_LOG_OBJECT (src, "Buffer #%d, adding unix timestamp: %llu",
GST_BUFFER_OFFSET (buffer), unix_ts);
/*{
GDateTime *frame_time, *tmpdt;
tmpdt = g_date_time_new_from_unix_utc (0);
frame_time = g_date_time_add_seconds(tmpdt, (gdouble)unix_ts / GST_SECOND);
g_date_time_unref (tmpdt);
GST_LOG ("Unix timestamp added is: %s.%d", g_date_time_format (frame_time, "%Y-%m-%d %H:%M:%S"), g_date_time_get_microsecond(frame_time));
g_date_time_unref (frame_time);
} */
}
#endif
dropped = copied_number - src->cumbufnum;
if (dropped > 0) {

4
sys/niimaq/gstniimaq.h
View File

@ -73,6 +73,10 @@ struct _GstNiImaqSrc {
gboolean session_started;
GAsyncQueue *time_queue;
GstClock *clock;
GstClockTime stream_base;
GstClockTime unix_base;
};
struct _GstNiImaqSrcClass {