ff_acelp_lp_decode  468 libavcodec/g729dec.c     ff_acelp_lp_decode(&lp[0][0], &lp[1][0], ctx->lsp[1], ctx->lsp[0], 10);
ff_acelp_lp_decode   91 libavcodec/lsp.h void ff_acelp_lp_decode(int16_t* lp_1st, int16_t* lp_2nd, const int16_t* lsp_2nd, const int16_t* lsp_prev, int lp_order);