Merge commit '4620affa24eedb167482198aa04126bcedd05620'

[ffmpeg] / libavformat / m4vdec.c

diff --git a/libavformat/m4vdec.c b/libavformat/m4vdec.c
index 4a0af3c03735e91c0883d797cc34f3f45060b965..117b7658731a369b1570f672c61f0bf45f03691c 100644 (file)
--- a/libavformat/m4vdec.c
+++ b/libavformat/m4vdec.c
@@ -2,20 +2,20 @@
  * RAW MPEG-4 video demuxer
  * Copyright (c) 2006  Thijs Vermeir <thijs.vermeir@barco.com>
  *
- * This file is part of Libav.
+ * This file is part of FFmpeg.
  *
- * Libav is free software; you can redistribute it and/or
+ * FFmpeg is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either
  * version 2.1 of the License, or (at your option) any later version.
  *
- * Libav is distributed in the hope that it will be useful,
+ * FFmpeg is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General Public
- * License along with Libav; if not, write to the Free Software
+ * License along with FFmpeg; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
@@ -33,16 +33,18 @@ static int mpeg4video_probe(AVProbeData *probe_packet)
 
     for (i = 0; i < probe_packet->buf_size; i++) {
         temp_buffer = (temp_buffer << 8) + probe_packet->buf[i];
-        if ((temp_buffer & 0xffffff00) != 0x100)
+        if (temp_buffer & 0xfffffe00)
+            continue;
+        if (temp_buffer < 2)
             continue;
 
         if (temp_buffer == VOP_START_CODE)
             VOP++;
         else if (temp_buffer == VISUAL_OBJECT_START_CODE)
             VISO++;
-        else if (temp_buffer < 0x120)
+        else if (temp_buffer >= 0x100 && temp_buffer < 0x120)
             VO++;
-        else if (temp_buffer < 0x130)
+        else if (temp_buffer >= 0x120 && temp_buffer < 0x130)
             VOL++;
         else if (!(0x1AF < temp_buffer && temp_buffer < 0x1B7) &&
                  !(0x1B9 < temp_buffer && temp_buffer < 0x1C4))
@@ -50,7 +52,7 @@ static int mpeg4video_probe(AVProbeData *probe_packet)
     }
 
     if (VOP >= VISO && VOP >= VOL && VO >= VOL && VOL > 0 && res == 0)
-        return AVPROBE_SCORE_EXTENSION;
+        return VOP+VO > 4 ? AVPROBE_SCORE_EXTENSION : AVPROBE_SCORE_EXTENSION/2;
     return 0;
 }