func: static av_cold int hevc_init_context(AVCodecContext *avctx)
  {
      HEVCContext *s = avctx->priv_data;
      int i;
      s->avctx = avctx;
      s->HEVClc = av_mallocz(sizeof(HEVCLocalContext));
      if (!s->HEVClc)
          goto fail;
      s->HEVClcList[0] = s->HEVClc;
      s->sList[0] = s;
      s->cabac_state = av_malloc(HEVC_CONTEXTS);
      if (!s->cabac_state)
          goto fail;
      s->output_frame = av_frame_alloc();
      if (!s->output_frame)
          goto fail;
      for (i = 0; i < FF_ARRAY_ELEMS(s->DPB); i++) {
          s->DPB[i].frame = av_frame_alloc();
          if (!s->DPB[i].frame)
              goto fail;
          s->DPB[i].tf.f = s->DPB[i].frame;
      }
      s->max_ra = INT_MAX;
      s->md5_ctx = av_md5_alloc();
      if (!s->md5_ctx)
          goto fail;
      ff_bswapdsp_init(&s->bdsp);
      s->context_initialized = 1;
      s->eos = 0;
      return 0;
  fail:
      hevc_decode_free(avctx);
      return AVERROR(ENOMEM);
  }