static void end_ebml_master_crc32(AVIOContext *pb, AVIOContext **dyn_cp, MatroskaMuxContext *mkv, ebml_master master) { uint8_t *buf, crc[4]; int size; if (pb->seekable) { size = avio_close_dyn_buf(*dyn_cp, &buf); if (mkv->write_crc && mkv->mode != MODE_WEBM) { AV_WL32(crc, av_crc(av_crc_get_table(AV_CRC_32_IEEE_LE), UINT32_MAX, buf, size) ^ UINT32_MAX); put_ebml_binary(pb, EBML_ID_CRC32, crc, sizeof(crc)); } avio_write(pb, buf, size); end_ebml_master(pb, master); } else { end_ebml_master(*dyn_cp, master); size = avio_close_dyn_buf(*dyn_cp, &buf); avio_write(pb, buf, size); } av_free(buf); *dyn_cp = NULL; }