static av_cold int jpg_init(AVCodecContext *avctx, JPGContext *c) { int ret; ret = build_vlc(&c->dc_vlc[0], avpriv_mjpeg_bits_dc_luminance, avpriv_mjpeg_val_dc, 12, 0); if (ret) return ret; ret = build_vlc(&c->dc_vlc[1], avpriv_mjpeg_bits_dc_chrominance, avpriv_mjpeg_val_dc, 12, 0); if (ret) return ret; ret = build_vlc(&c->ac_vlc[0], avpriv_mjpeg_bits_ac_luminance, avpriv_mjpeg_val_ac_luminance, 251, 1); if (ret) return ret; ret = build_vlc(&c->ac_vlc[1], avpriv_mjpeg_bits_ac_chrominance, avpriv_mjpeg_val_ac_chrominance, 251, 1); if (ret) return ret; ff_blockdsp_init(&c->bdsp, avctx); ff_idctdsp_init(&c->idsp, avctx); ff_init_scantable(c->idsp.idct_permutation, &c->scantable, ff_zigzag_direct); return 0; }