virtualenv/FFmpeg
1
0
Fork 0
mirror of https://github.com/FFmpeg/FFmpeg.git synced 2024-12-23 12:43:46 +02:00
Code Issues Releases Activity

h264: clear trailing bits in partially parsed NAL units

Browse Source 
Trailing bits are likely to be non-zero if the NAL unit is truncated.
Clearing the bits make overreads of the bitstream less likely in this
case. Fixes playback of
http://streams.videolan.org/streams/mp4/Mr_MrsSmith-h264_aac.mp4 which
has a forbidden byte sequence of 0x00 0x00 0x00 in it SPS.
This commit is contained in:
Janne Grunau 2011-12-19 18:11:44 +01:00
parent 0a6aff6936
commit 729ebb2f18
1 changed files with 4 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
libavcodec/h264.c
View File

@ -3759,7 +3759,7 @@ static int decode_nal_units(H264Context *h, const uint8_t *buf, int buf_size){
int consumed;
int dst_length;
int bit_length;
const uint8_t *ptr;
uint8_t *ptr;
int i, nalsize = 0;
int err;
@ -3809,6 +3809,9 @@ 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);
}