[client 5/5] gstreamer: Add the encoded frame's rank to the statistics

[Francois Gouget <fgouget@xxxxxxxxxxxxxxx>]

The number of frames that were sitting in the decoding_queue before the
current frame was added is crucial to correctly interpret the decoding
time:
* Less than MAX_DECODED_FRAMES means nothing blocked the decoding of
  that frame.
* More than MAX_DECODED_FRAMES means decoding was delayed by one or more
  frame intervals.

Signed-off-by: Francois Gouget <fgouget@xxxxxxxxxxxxxxx>
---
 src/channel-display-gst.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/channel-display-gst.c b/src/channel-display-gst.c
index fc338dff..b8f0c2ee 100644
--- a/src/channel-display-gst.c
+++ b/src/channel-display-gst.c
@@ -90,6 +90,7 @@ struct SpiceGstFrame {
     GstBuffer *encoded_buffer;
     SpiceFrame *encoded_frame;
     GstSample *decoded_sample;
+    guint rank;
 };
 
 static SpiceGstFrame *create_gst_frame(GstBuffer *buffer, SpiceFrame *frame)
@@ -442,9 +443,9 @@ sink_event_probe(GstPad *pad, GstPadProbeInfo *info, gpointer data)
             int64_t duration = g_get_monotonic_time() - frame->creation_time;
             record(frames_stats,
                    "frame mm_time %u size %u creation time %" PRId64
-                   " decoded time %" PRId64 " queue %u",
+                   " decoded time %" PRId64 " rank %u queue %u",
                    frame->mm_time, frame->size, frame->creation_time, duration,
-                   g_queue_get_length(decoder->decoding_queue));
+                   gstframe->rank, g_queue_get_length(decoder->decoding_queue));
 
             if (!decoder->appsink) {
                 /* The sink will display the frame directly so this
@@ -729,6 +730,7 @@ static gboolean spice_gst_decoder_queue_frame(VideoDecoder *video_decoder,
 
     SpiceGstFrame *gst_frame = create_gst_frame(buffer, frame);
     g_mutex_lock(&decoder->queues_mutex);
+    gst_frame->rank = g_queue_get_length(decoder->decoding_queue);
     g_queue_push_tail(decoder->decoding_queue, gst_frame);
     g_mutex_unlock(&decoder->queues_mutex);
 
-- 
2.20.1
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