stagefright: MPEG4Extractor: allow 'hdlr' box before first track

Bug: 21725583
Change-Id: I799c1967759c7e49fb50281a1708188450caac77

1 files changed, 3 insertions, 4 deletions

diff --git a/media/libstagefright/MPEG4Extractor.cpp b/media/libstagefright/MPEG4Extractor.cpp
index a76334f..38ae6f3 100755
--- a/media/libstagefright/MPEG4Extractor.cpp
+++ b/media/libstagefright/MPEG4Extractor.cpp
@@ -1952,15 +1952,14 @@ status_t MPEG4Extractor::parseChunk(off64_t *offset, int depth) {
                 return ERROR_IO;
             }
 
-            if (mLastTrack == NULL)
-                return ERROR_MALFORMED;
-
             uint32_t type = ntohl(buffer);
             // For the 3GPP file format, the handler-type within the 'hdlr' box
             // shall be 'text'. We also want to support 'sbtl' handler type
             // for a practical reason as various MPEG4 containers use it.
             if (type == FOURCC('t', 'e', 'x', 't') || type == FOURCC('s', 'b', 't', 'l')) {
-                mLastTrack->meta->setCString(kKeyMIMEType, MEDIA_MIMETYPE_TEXT_3GPP);
+                if (mLastTrack != NULL) {
+                    mLastTrack->meta->setCString(kKeyMIMEType, MEDIA_MIMETYPE_TEXT_3GPP);
+                }
             }
 
             break;