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Code Issues Releases Activity

hevc: only write to max_ra and pocTid0 in the first slice.

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Values from subsequent values are guaranteed to be identical (since
poc and nal_unit_type are checked to be the same between slices), so
this doesn't affect output in any way, but does resolve the remaining
reported race conditions (by tsan) in fate-hevc.

In practice, this fixes tsan warnings like this:

WARNING: ThreadSanitizer: data race (pid=25334)
  Read of size 4 at 0x7d9c0001adcc by main thread (mutexes: write M1386):
     hevc_update_thread_context src/libavcodec/hevcdec.c:3310 (ffmpeg+0x000000b41c7c)
[..]
  Previous write of size 4 at 0x7d9c0001adcc by thread T1 (mutexes: write M1383):
     hls_slice_header src/libavcodec/hevcdec.c:596 (ffmpeg+0x000000b43a22)
This commit is contained in:
Ronald S. Bultje 2017-04-03 09:51:10 -04:00
parent 1269cd5b6f
commit 1f50baa2b2
1 changed files with 16 additions and 16 deletions

32
libavcodec/hevcdec.c

@ -585,7 +585,7 @@ static int hls_slice_header(HEVCContext *s)
}
/* 8.3.1 */
if (s->temporal_id == 0 &&
if (sh->first_slice_in_pic_flag && s->temporal_id == 0 &&
s->nal_unit_type != HEVC_NAL_TRAIL_N &&
s->nal_unit_type != HEVC_NAL_TSA_N &&
s->nal_unit_type != HEVC_NAL_STSA_N &&
@ -2771,25 +2771,25 @@ static int decode_nal_unit(HEVCContext *s, const H2645NAL *nal)
if (ret < 0)
return ret;
if (s->max_ra == INT_MAX) {
if (s->nal_unit_type == HEVC_NAL_CRA_NUT || IS_BLA(s)) {
s->max_ra = s->poc;
if (s->sh.first_slice_in_pic_flag) {
if (s->max_ra == INT_MAX) {
if (s->nal_unit_type == HEVC_NAL_CRA_NUT || IS_BLA(s)) {
s->max_ra = s->poc;
} else {
if (IS_IDR(s))
s->max_ra = INT_MIN;
}
}
if ((s->nal_unit_type == HEVC_NAL_RASL_R || s->nal_unit_type == HEVC_NAL_RASL_N) &&
s->poc <= s->max_ra) {
s->is_decoded = 0;
break;
} else {
if (IS_IDR(s))
if (s->nal_unit_type == HEVC_NAL_RASL_R && s->poc > s->max_ra)
s->max_ra = INT_MIN;
}
}
if ((s->nal_unit_type == HEVC_NAL_RASL_R || s->nal_unit_type == HEVC_NAL_RASL_N) &&
s->poc <= s->max_ra) {
s->is_decoded = 0;
break;
} else {
if (s->nal_unit_type == HEVC_NAL_RASL_R && s->poc > s->max_ra)
s->max_ra = INT_MIN;
}
if (s->sh.first_slice_in_pic_flag) {
ret = hevc_frame_start(s);
if (ret < 0)
return ret;