func: static av_cold int mace_decode_init(AVCodecContext * avctx)
  
  {
  
      MACEContext *ctx = avctx->priv_data;
  
  
  
      if (avctx->channels > 2)
  
          return -1;
  
      avctx->sample_fmt = AV_SAMPLE_FMT_S16;
  
  
  
      avcodec_get_frame_defaults(&ctx->frame);
  
      avctx->coded_frame = &ctx->frame;
  
  
  
      return 0;
  
  }
  