int avcodec_close(AVCodecContext *avctx) { /* If there is a user-supplied mutex locking routine, call it. */ if (ff_lockmgr_cb) { if ((*ff_lockmgr_cb)(&codec_mutex, AV_LOCK_OBTAIN)) return -1; } entangled_thread_counter++; if(entangled_thread_counter != 1){ av_log(avctx, AV_LOG_ERROR, "insufficient thread locking around avcodec_open/close()\n"); entangled_thread_counter--; return -1; } if (HAVE_THREADS && avctx->thread_opaque) avcodec_thread_free(avctx); if (avctx->codec->close) avctx->codec->close(avctx); avcodec_default_free_buffers(avctx); av_freep(&avctx->priv_data); avctx->codec = NULL; entangled_thread_counter--; /* Release any user-supplied mutex. */ if (ff_lockmgr_cb) { (*ff_lockmgr_cb)(&codec_mutex, AV_LOCK_RELEASE); } return 0; }