avformat/avienc: Correct possible dereference of null

[ffmpeg] / libavformat / dtsdec.c

diff --git a/libavformat/dtsdec.c b/libavformat/dtsdec.c
index 50b14c66356b61de99e581b5ba069d1e386f0273..da0fb61a60aa90b1725f5c53f79fadb4a761a7f8 100644 (file)
--- a/libavformat/dtsdec.c
+++ b/libavformat/dtsdec.c
@@ -50,9 +50,11 @@ static int dts_probe(AVProbeData *p)
             diff += FFABS(((int16_t)AV_RL16(buf)) - (int16_t)AV_RL16(buf-4));
 
         /* regular bitstream */
-        if (state == DCA_SYNCWORD_CORE_BE)
+        if (state == DCA_SYNCWORD_CORE_BE &&
+            (bytestream_get_be16(&bufp) & 0xFC00) == 0xFC00)
             marker = 0;
-        else if (state == DCA_SYNCWORD_CORE_LE)
+        else if (state == DCA_SYNCWORD_CORE_LE &&
+                 (bytestream_get_be16(&bufp) & 0x00FC) == 0x00FC)
             marker = 1;
 
         /* 14 bits big-endian bitstream */