Revert "h264: clear trailing bits in partially parsed NAL units"

This reverts commit 729ebb2f185244b0ff06d48edbbbbb02ceb4ed4e.

There was an off-by-one error in the bit mask calculation clearing
actually the last valid bit and causing
http://bugzilla.libav.org/show_bug.cgi?id=227

The broken sample (Mr_MrsSmith-h264_aac.mp4) the commit was fixing
does not work after correcting the off-by-one error.

CC: libav-stable@libav.org
(cherry picked from commit 8a6037c3900875ccab8d553d2cc659bdef2c9d0e)

Signed-off-by: Reinhard Tartler <siretart@tauware.de>

diff --git a/libavcodec/h264.c b/libavcodec/h264.c
index 449c634cfef3f4f37d2af0d7b9b4c5f8476d001b..46e6c728322eee305f948a701d37f19993482cd5 100644 (file)
--- a/libavcodec/h264.c
+++ b/libavcodec/h264.c
@@ -3763,7 +3763,7 @@ static int decode_nal_units(H264Context *h, const uint8_t *buf, int buf_size){
         int consumed;
         int dst_length;
         int bit_length;
-        uint8_t *ptr;
+        const uint8_t *ptr;
         int i, nalsize = 0;
         int err;
 
@@ -3813,9 +3813,6 @@ static int decode_nal_units(H264Context *h, const uint8_t *buf, int buf_size){
         }
 
         if (h->is_avc && (nalsize != consumed) && nalsize){
-            // set trailing bits in the last partial byte to zero
-            if (bit_length & 7)
-                ptr[bit_length >> 3] = ptr[bit_length >> 3] & (0xff << 8 - (bit_length & 7));
             av_log(h->s.avctx, AV_LOG_DEBUG, "AVC: Consumed only %d bytes instead of %d\n", consumed, nalsize);
         }