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kayasrc: 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 09:35:39 -04:00
parent 1611f54672
commit 75aaec26b6
2 changed files with 37 additions and 1 deletions
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35
sys/kaya/gstkayasrc.c
View File

@ -112,6 +112,11 @@ static GstStaticPadTemplate gst_kayasrc_src_template =
);
#if GST_CHECK_VERSION(1,14,0)
static GstStaticCaps unix_reference = GST_STATIC_CAPS ("timestamp/x-unix");
#endif
/* class initialization */
G_DEFINE_TYPE (GstKayaSrc, gst_kayasrc, GST_TYPE_PUSH_SRC);
@ -201,6 +206,7 @@ gst_kayasrc_cleanup (GstKayaSrc * src)
src->dropped_frames = 0;
src->stop_requested = FALSE;
src->acquisition_started = FALSE;
src->kaya_base = GST_CLOCK_TIME_NONE;
if (src->caps) {
gst_caps_unref (src->caps);
@ -254,6 +260,8 @@ gst_kayasrc_init (GstKayaSrc * src)
src->cam_handle = INVALID_CAMHANDLE;
src->stream_handle = INVALID_STREAMHANDLE;
src->buffer_handles = NULL;
src->kaya_base = GST_CLOCK_TIME_NONE;
}
static void
@ -702,12 +710,14 @@ gst_kayasrc_stream_buffer_callback (STREAM_BUFFER_HANDLE buffer_handle,
unsigned char *data;
guint32 buf_id;
static guint64 buffers_processed = 0;
GstClockTime timestamp;
VideoFrame *vf;
GstClock *clock;
KYFG_BufferGetInfo (buffer_handle, KY_STREAM_BUFFER_INFO_TIMESTAMP,
&timestamp, NULL, NULL);
KYFG_BufferGetInfo (buffer_handle, KY_STREAM_BUFFER_INFO_BASE, &data, NULL,
NULL);
KYFG_BufferGetInfo (buffer_handle, KY_STREAM_BUFFER_INFO_ID, &buf_id, NULL,
NULL);
@ -723,6 +733,29 @@ gst_kayasrc_stream_buffer_callback (STREAM_BUFFER_HANDLE buffer_handle,
(gpointer) data, src->frame_size, 0, src->frame_size, vf,
(GDestroyNotify) buffer_release);
if (src->kaya_base == GST_CLOCK_TIME_NONE) {
/* assume delay between these two calls is negligible */
src->kaya_base = KYFG_GetGrabberValueInt (src->cam_handle, "Timestamp");
src->unix_base = g_get_real_time () * 1000;
}
#if GST_CHECK_VERSION(1,14,0)
{
GstClockTime unix_ts = src->unix_base + (timestamp - src->kaya_base);
gst_buffer_add_reference_timestamp_meta (buf,
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 (buf), 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
clock = gst_element_get_clock (GST_ELEMENT (src));
GST_BUFFER_TIMESTAMP (buf) =
GST_CLOCK_DIFF (gst_element_get_base_time (GST_ELEMENT (src)),

3
sys/kaya/gstkayasrc.h
View File

@ -63,6 +63,9 @@ struct _GstKayaSrc
GstCaps *caps;
GAsyncQueue *queue;
GstClockTime unix_base;
GstClockTime kaya_base;
};
struct _GstKayaSrcClass