qtdemux: fill timestamp table completely

When there are less timestamps that there are samples, fill up the sample table
with the last know timestamp. This situation can happen when the last sample
does not decode and doesn't need a timestamp. We however calculate the total
track length using the last sample timestamp so we need to have something
sensible in there.

Fixes #585056

1 files changed, 18 insertions, 3 deletions

diff --git a/gst/qtdemux/qtdemux.c b/gst/qtdemux/qtdemux.c
index 8f800697..4841222e 100644
--- a/gst/qtdemux/qtdemux.c
+++ b/gst/qtdemux/qtdemux.c
@@ -3464,6 +3464,7 @@ qtdemux_parse_samples (GstQTDemux * qtdemux, QtDemuxStream * stream,
   done2:
 
     n_sample_times = QT_UINT32 (stts_data + 12);
+    GST_LOG_OBJECT (qtdemux, "%u timestamp blocks", n_sample_times);
     timestamp = 0;
     stream->min_duration = 0;
     time = 0;
@@ -3477,14 +3478,17 @@ qtdemux_parse_samples (GstQTDemux * qtdemux, QtDemuxStream * stream,
       stts_data += 4;
       duration = QT_UINT32 (stts_data);
       stts_data += 4;
+      GST_LOG_OBJECT (qtdemux, "block %d, %u timestamps, duration %u ", i, n,
+          duration);
 
       /* take first duration for fps */
       if (G_UNLIKELY (stream->min_duration == 0))
         stream->min_duration = duration;
 
       for (j = 0; j < n; j++) {
-        GST_DEBUG_OBJECT (qtdemux, "sample %d: timestamp %" GST_TIME_FORMAT,
-            index, GST_TIME_ARGS (timestamp));
+        GST_DEBUG_OBJECT (qtdemux,
+            "sample %d: index %d, timestamp %" GST_TIME_FORMAT, index, j,
+            GST_TIME_ARGS (timestamp));
 
         samples[index].timestamp = timestamp;
         /* add non-scaled values to avoid rounding errors */
@@ -3497,6 +3501,16 @@ qtdemux_parse_samples (GstQTDemux * qtdemux, QtDemuxStream * stream,
           goto done3;
       }
     }
+    /* fill up empty timestamps with the last timestamp, this can happen when
+     * the last samples do not decoder and so we don't have timestamps for them.
+     * We however look at the last timestamp to estimate the track length so we
+     * need something in here. */
+    for (; index < n_samples; index++) {
+      GST_DEBUG_OBJECT (qtdemux, "fill sample %d: timestamp %" GST_TIME_FORMAT,
+          index, GST_TIME_ARGS (timestamp));
+      samples[index].timestamp = timestamp;
+      samples[index].duration = -1;
+    }
   done3:
 
     /* sample sync, can be NULL */
@@ -3783,7 +3797,8 @@ done:
     stream->segments[0].media_stop = stream_duration;
     stream->segments[0].rate = 1.0;
 
-    GST_DEBUG_OBJECT (qtdemux, "created dummy segment");
+    GST_DEBUG_OBJECT (qtdemux, "created dummy segment %" GST_TIME_FORMAT,
+        GST_TIME_ARGS (stream_duration));
     stream->n_segments = 1;
   }
   GST_DEBUG_OBJECT (qtdemux, "using %d segments", stream->n_segments);