From 4e283dbb6255a9442621978c42b51a59ba5752d2 Mon Sep 17 00:00:00 2001
From: Thiago Santos <ts.santos@sisa.samsung.com>
Date: Wed, 8 Jan 2014 16:33:05 -0300
Subject: [PATCH] mpeg4videoparse: do not lose DISCONT flag if buffer isn't
 pushed

mpeg4videoparse might not push buffers while parsing. If those buffers
contain the DISCONT flag, it gets lost and downstream won't get any
buffer with the flag.

Fix it by adding the DISCONT to the next pushed buffer.
This makes backwards playback work.
---
 gst/videoparsers/gstmpeg4videoparse.c | 10 ++++++++++
 gst/videoparsers/gstmpeg4videoparse.h |  2 ++
 2 files changed, 12 insertions(+)

diff --git a/gst/videoparsers/gstmpeg4videoparse.c b/gst/videoparsers/gstmpeg4videoparse.c
index badc32d9e2..1afaa17c88 100644
--- a/gst/videoparsers/gstmpeg4videoparse.c
+++ b/gst/videoparsers/gstmpeg4videoparse.c
@@ -211,6 +211,7 @@ gst_mpeg4vparse_reset (GstMpeg4VParse * mp4vparse)
   mp4vparse->level = NULL;
   mp4vparse->pending_key_unit_ts = GST_CLOCK_TIME_NONE;
   mp4vparse->force_key_unit_event = NULL;
+  mp4vparse->discont = FALSE;
 
   gst_buffer_replace (&mp4vparse->config, NULL);
   memset (&mp4vparse->vol, 0, sizeof (mp4vparse->vol));
@@ -414,6 +415,11 @@ gst_mpeg4vparse_handle_frame (GstBaseParse * parse,
   gboolean ret = FALSE;
   guint framesize = 0;
 
+  if (G_UNLIKELY (GST_BUFFER_FLAG_IS_SET (frame->buffer,
+              GST_BUFFER_FLAG_DISCONT))) {
+    mp4vparse->discont = TRUE;
+  }
+
   gst_buffer_map (frame->buffer, &map, GST_MAP_READ);
   data = map.data;
   size = map.size;
@@ -528,6 +534,10 @@ out:
     res = gst_mpeg4vparse_parse_frame (parse, frame);
     if (res == GST_BASE_PARSE_FLOW_DROPPED)
       frame->flags |= GST_BASE_PARSE_FRAME_FLAG_DROP;
+    if (G_UNLIKELY (mp4vparse->discont)) {
+      GST_BUFFER_FLAG_SET (frame->buffer, GST_BUFFER_FLAG_DISCONT);
+      mp4vparse->discont = FALSE;
+    }
     return gst_base_parse_finish_frame (parse, frame, framesize);
   }
 
diff --git a/gst/videoparsers/gstmpeg4videoparse.h b/gst/videoparsers/gstmpeg4videoparse.h
index a67532404d..878cf605b4 100644
--- a/gst/videoparsers/gstmpeg4videoparse.h
+++ b/gst/videoparsers/gstmpeg4videoparse.h
@@ -59,6 +59,8 @@ struct _GstMpeg4VParse {
   GstMpeg4VisualObject vo;
   gint vo_offset;
 
+  gboolean discont;
+
   GstBuffer *config;
   GstMpeg4VideoObjectLayer vol;
   gboolean vol_offset;