From d705291cbdc9353f9865a0cdbb9dee984c273a8e Mon Sep 17 00:00:00 2001
From: "Joshua M. Doe" <oss@nvl.army.mil>
Date: Wed, 30 Oct 2019 14:51:39 -0400
Subject: [PATCH] imperxflexsrc: fix timestamps

Previous implementation was trying to be too clever. If we want absolute
timestamps we can use the timestamp/x-unix reference time meta.
---
 sys/imperxflex/gstframelinksrc.c | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/sys/imperxflex/gstframelinksrc.c b/sys/imperxflex/gstframelinksrc.c
index 82dace4..9a39c4a 100644
--- a/sys/imperxflex/gstframelinksrc.c
+++ b/sys/imperxflex/gstframelinksrc.c
@@ -640,9 +640,16 @@ gst_framelinksrc_callback (void *lpUserData, VCECLB_FrameInfoEx * pFrameInfo)
   static guint64 last_frame_number = 0;
   static guint64 buffers_processed = 0;
   static guint64 total_dropped_frames = 0;
+  GstClock *clock;
+  GstClockTime timestamp;
 
   g_assert (src != NULL);
 
+  clock = gst_element_get_clock (GST_ELEMENT (src));
+  timestamp = GST_CLOCK_DIFF (gst_element_get_base_time (GST_ELEMENT (src)),
+      gst_clock_get_time (clock));
+  gst_object_unref (clock);
+
   /* check for DMA errors */
   if (pFrameInfo->dma_status == VCECLB_DMA_STATUS_FRAME_DROP) {
     /* TODO: save this in dropped frame total? */
@@ -691,9 +698,8 @@ gst_framelinksrc_callback (void *lpUserData, VCECLB_FrameInfoEx * pFrameInfo)
 
   src->buffer = gst_framelinksrc_create_buffer_from_frameinfo (src, pFrameInfo);
 
-  GST_BUFFER_TIMESTAMP (src->buffer) =
-      GST_CLOCK_DIFF (gst_element_get_base_time (GST_ELEMENT (src)),
-      src->acq_start_time + pFrameInfo->timestamp * GST_USECOND);
+  GST_BUFFER_TIMESTAMP (src->buffer) = timestamp;
+
   GST_BUFFER_OFFSET (src->buffer) = buffers_processed;
   ++buffers_processed;