int ff_lock_avcodec(AVCodecContext *log_ctx, const AVCodec *codec) { if (codec->caps_internal & FF_CODEC_CAP_INIT_THREADSAFE || !codec->init) return 0; if (ff_mutex_lock(&codec_mutex)) return -1; if (atomic_fetch_add(&entangled_thread_counter, 1)) { av_log(log_ctx, AV_LOG_ERROR, "Insufficient thread locking. At least %d threads are " "calling avcodec_open2() at the same time right now.\n", atomic_load(&entangled_thread_counter)); ff_avcodec_locked = 1; ff_unlock_avcodec(codec); return AVERROR(EINVAL); } av_assert0(!ff_avcodec_locked); ff_avcodec_locked = 1; return 0; }