Hi,
i'm using libav in a multithreading context and i'm facing the problem
of concurrent access to a few libav functions.
I'm programming in c++ and i'm using OpenMP for multithreading.
I have an AudioConverter class. In its init, i do:
static class Once {
public:
Once() {
#ifdef OPENMP_IN_USE
av_lockmgr_register(&lockMgr);
#endif
avcodec_register_all();
av_register_all();
avformat_network_init();
}
} Once_;
and lockMgr is defined as:
#ifdef OPENMP_IN_USE
static int lockMgr(void **mutex, enum AVLockOp op) {
// returns are 0 success
omp_lock_t** m = (omp_lock_t**) mutex;
if (op == AV_LOCK_CREATE) {
*m = new omp_lock_t();
omp_init_lock(*m);
return 0;
}
else if (op == AV_LOCK_DESTROY) {
omp_destroy_lock(*m);
return 0;
}
else if (op == AV_LOCK_OBTAIN) {
omp_set_lock(*m);
return 0;
}
else if (op == AV_LOCK_RELEASE) {
omp_unset_lock(*m);
return 0;
}
else {
return -1;
}
}
#endif
As i understand, this would be enough to protect any libav function that
needs to be protected against concurrent access. Is that true?
I stil get:
[aac @ 0x7f1d0c004020] insufficient thread locking around
avcodec_open/close()
and sometimes:
what(): Cannot open audio codec for myUrl (the exception i throw when
avcodec_open2 fails)
Have i missed something ?
thanks for your help
Florian
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