From 65d90baf8441c71a67a6b0bd7d6f340821653269 Mon Sep 17 00:00:00 2001
From: Edward Hervey <bilboed@bilboed.com>
Date: Thu, 3 Sep 2009 17:33:28 +0200
Subject: [PATCH] jpegdec: Avoid unnecessary processing until we have a full
 picture.

This is for non-packetized mode, when we know the upstream size in bytes.
---
 ext/jpeg/gstjpegdec.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/ext/jpeg/gstjpegdec.c b/ext/jpeg/gstjpegdec.c
index a7312bae8a..e040342f6b 100644
--- a/ext/jpeg/gstjpegdec.c
+++ b/ext/jpeg/gstjpegdec.c
@@ -872,6 +872,18 @@ gst_jpeg_dec_chain (GstPad * pad, GstBuffer * buf)
   }
   buf = NULL;
 
+  /* If we are non-packetized and know the total incoming size in bytes,
+   * just wait until we have enough before doing any processing. */
+
+  if (!dec->packetized && (dec->segment.format == GST_FORMAT_BYTES) &&
+      (dec->segment.stop != -1) &&
+      (GST_BUFFER_SIZE (dec->tempbuf) < dec->segment.stop)) {
+    /* We assume that non-packetized input in bytes is *one* single jpeg image */
+    GST_DEBUG ("Non-packetized mode. Got %d bytes, need %d",
+        GST_BUFFER_SIZE (dec->tempbuf), dec->segment.stop);
+    goto need_more_data;
+  }
+
   if (!gst_jpeg_dec_ensure_header (dec))
     goto need_more_data;